(283 days)
QKZ
Not Found
No
The summary does not mention any AI, ML, or deep learning technologies, nor does it describe any image processing capabilities that would typically utilize such methods. The focus is on the magnetic control of the capsule and the performance metrics of lesion detection.
No.
The device is intended for visualization (imaging) of the stomach and duodenum for diagnostic purposes, not for treating a condition.
Yes
The device is described as an "endoscopic capsule imaging system" intended to "obtain images of the stomach and duodenum." The performance studies report metrics such as sensitivity, specificity, and accuracy for detecting "gastric focal lesions," "superficial gastric neoplasia," and "advanced cancer." This indicates that the device is used to identify and characterize medical conditions, which is the definition of a diagnostic device.
No
The device description explicitly lists hardware components: an ingestible capsule, a data recorder, a locator, and a controller.
Based on the provided information, the NaviCam Stomach Capsule is not an In Vitro Diagnostic (IVD) device.
Here's why:
- IVD Definition: In Vitro Diagnostics are devices intended for use in the examination of specimens derived from the human body in order to provide information for diagnostic purposes. This typically involves testing biological samples like blood, urine, tissue, etc., outside of the body.
- NaviCam Stomach Capsule Function: The NaviCam Stomach Capsule is an imaging system that is ingested by the patient. It captures images of the stomach and duodenum inside the body. It does not analyze biological specimens.
- Intended Use: The intended use is for "visualization of the stomach," which is an in-vivo imaging procedure, not an in-vitro diagnostic test.
Therefore, the NaviCam Stomach Capsule falls under the category of an in-vivo imaging device rather than an IVD.
N/A
Intended Use / Indications for Use
The NaviCam Stomach Capsule is intended for visualization of the stomach of adults (≥22 years old) with a BMI less than 38. The system can be used in clinics and hospitals, including ER settings.
Product codes
QKZ
Device Description
The NaviCam Capsule Endoscopy System with NaviCam Stomach Capsule is an endoscopic capsule imaging system intended to obtain images of the stomach and duodenum. In contrast to passive capsule endoscopy systems, it uses external magnetic fields to allow the position of the capsule to be controlled by an operator. The NaviCam Capsule Endoscopy System with NaviCam Stomach Capsule consists of an ingestible capsule, a data recorder, a locator, and a controller.
Mentions image processing
Yes
Mentions AI, DNN, or ML
Not Found
Input Imaging Modality
Not Found
Anatomical Site
stomach, duodenum
Indicated Patient Age Range
adults (≥22 years old)
Intended User / Care Setting
clinics and hospitals, including ER settings.
Description of the training set, sample size, data source, and annotation protocol
Not Found
Description of the test set, sample size, data source, and annotation protocol
Not Found
Summary of Performance Studies (study type, sample size, AUC, MRMC, standalone performance, key results)
COMPARATIVE STUDY
- Study type: Multicenter blinded study, magnetic capsule endoscopy (MCE) compared with conventional gastroscopy.
- Sample size: 350 patients with upper abdominal complaints.
- Key results: MCE detected gastric focal lesions in the entire stomach with 90.4% sensitivity, 94.7% specificity, PPV of 87.9%, NPV of 95.9% and 93.4% accuracy. The detection of lesions was similar for MCE and gastroscopy. Sensitivity was greater than or equal to 87.5% (77.3-97.8%) for lesions ≥5 mm. No adverse events were observed, and there were no cases of capsule retention.
CHINESE FOOD AND DRUG ADMINISTRATION (CFDA) STUDY
- Study type: Comparative trial to determine the consistency between the evaluation of the upper gastrointestinal tract by gastroscopy and CE.
- Sample size: 99 subjects.
- Key results: Sensitivity was 90.9%, the specificity was 94.8%, the diagnostic accuracy was 93.9%, the positive predictive value was 83.3% and the negative predictive value was 97.3%. The number of detected focal esophageal lesions was seven and the detection rate was 7.1%. The number of detected focal duodenal lesions was eight and the detection rate was 8.1%. Effective visualization rate of the upper gastrointestinal examinations was 92% for dentate line, 97% for cardia, 95% for fundus, 99% for gastric body, 99% for gastric antrum, 99% for pylorus, and 96% for duodenal bulb. No adverse events were observed and there were no cases of capsule retention.
Literature Study 1
- Study type: Observational cohort study of screening for gastric cancer with MCE.
- Sample size: 3182 asymptomatic Chinese individuals.
- Key results: Seven patients with ulcers and suspected malignancies were referred for gastroscopy and biopsy. The MCE studies revealed seven (0.22%) patients with advanced cancer that were all confirmed as adenocarcinoma pathologically. Additional lesions included gastric ulcers (4.9%), gastric polyps (10.4%) and submucosal tumors (3.6%). At the 2week follow-up, capsule retention occurred in 27 cases; however, all patients excreted the capsule in the following 3 to 4 weeks.
Literature Study 2
- Study type: Self-controlled comparison study.
- Sample size: Ten subjects diagnosed with superficial gastric neoplasia and scheduled to undergo endoscopic submucosal dissection (ESD).
- Key results: MCE detected 11 lesions (91.7%) in the correct location, while missing 1 neoplastic lesion at the cardia. The per-patient and per-lesion sensitivities of MCE for superficial gastric neoplasia detection were 100% and 91.7%. There were no reports of serious adverse events.
Key Metrics (Sensitivity, Specificity, PPV, NPV, etc.)
COMPARATIVE STUDY:
- Sensitivity: 90.4%
- Specificity: 94.7%
- PPV: 87.9%
- NPV: 95.9%
- Diagnostic Accuracy: 93.4%
CHINESE FOOD AND DRUG ADMINISTRATION (CFDA) STUDY:
- Sensitivity: 90.9%
- Specificity: 94.8%
- Diagnostic Accuracy: 93.9%
- Positive Predictive Value: 83.3%
- Negative Predictive Value: 97.3%
- Effective visualization rate: dentate line (92%), cardia (97%), fundus (95%), gastric body (99%), gastric antrum (99%), pylorus (99%), and duodenal bulb (96%).
Literature Study 2:
- Per-patient sensitivity (superficial gastric neoplasia detection): 100%
- Per-lesion sensitivity (superficial gastric neoplasia detection): 91.7%
Predicate Device(s)
Not Found
Reference Device(s)
Not Found
Predetermined Change Control Plan (PCCP) - All Relevant Information for the subject device only
Not Found
§ 876.1310 Magnetically maneuvered capsule endoscopy system.
(a)
Identification. A magnetically maneuvered capsule endoscopy system consists of an ingestible capsule and magnetic controller and is used for visualization of the stomach and duodenum. The ingestible capsule contains a camera that wirelessly captures images of the mucosa. The magnetic controller is used outside of the patient and is magnetically coupled with the capsule to control its location and viewing direction.(b)
Classification. Class II (special controls). The special controls for this device are:(1) Clinical performance testing with the device under anticipated conditions of use must evaluate visualization of the intended region and document the adverse event profile.
(2) Non-clinical testing data must demonstrate the optical, mechanical, and functional integrity of the device under physically stressed conditions. The following performance characteristics must be tested, and detailed protocols must be provided for each test:
(i) A bite test must be performed to ensure that the capsule can withstand extreme cases of biting;
(ii) A pH resistance test must be performed to evaluate integrity of the capsule when exposed to a physiological relevant range of pH values;
(iii) A battery life test must be performed to demonstrate that the capsule's operating time is not constrained by the battery capacity;
(iv) A shelf life test must be performed to demonstrate that the device performs as intended at the proposed shelf life date;
(v) Optical testing must be performed to evaluate fundamental image quality characteristics such as resolution, field of view, depth of field, geometric distortion, signal to noise ratio, dynamic range, and image intensity uniformity;
(vi) A color performance test must be performed to compare the color differences between the input scene and output image;
(vii) A photobiological safety analysis must be performed based on maximum (worst-case) light exposure to internal gastrointestinal mucosa, and covering ultraviolet, visible, and near-infrared ranges, as appropriate. A mitigation analysis must be provided;
(viii) Performance testing must demonstrate that the viewing software clearly presents the current frame rate, which is either adjustable manually by the user or automatically by the device. Testing must demonstrate that the viewing software alerts the user when the video quality is reduced from nominal due to imaging data communication or computation problems;
(ix) A data transmission test must be performed to verify the robustness of the data transmission between the capsule and the receiver. This test must include controlled signal attenuation for simulating a non-ideal environment; and
(x) Magnetic field strength testing characterization must be performed to identify the distances from the magnet that are safe for patients and users with ferromagnetic implants, devices, or objects.
(3) Software validation, verification, and hazard analysis must be provided.
(4) Electrical safety, thermal safety, mechanical safety, and electromagnetic compatibility testing must be performed.
(5) The patient-contacting components of the device must be demonstrated to be biocompatible.
(6) Performance data must validate the reprocessing instructions for the reusable components of the device.
(7) Performance data must demonstrate the sterility of any device components labeled sterile.
(8) Human factors testing must demonstrate that the intended users can safely and correctly use the device, based solely on reading the instructions for use.
(9) Clinician labeling must include:
(i) Specific instructions and the clinical and technical expertise needed for the safe use of the device;
(ii) A detailed summary of the clinical testing pertinent to use of the device, including information on effectiveness and device- and procedure-related complications;
(iii) The patient preparation procedure;
(iv) A detailed summary of the device technical parameters;
(v) Magnetic field safe zones;
(vi) A screening checklist to ensure that all patients and operating staff are screened from bringing ferromagnetic implants, devices, or objects near the external magnet;
(vii) Reprocessing instructions for reusable components;
(viii) Shelf life for single use components; and
(ix) Use life for reusable components.
(10) Patient labeling must include:
(i) An explanation of the device and the mechanism of operation;
(ii) The patient preparation procedure;
(iii) A brief summary of the clinical study; and
(iv) A summary of the device- and procedure-related complications pertinent to use of the device.
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DE NOVO CLASSIFICATION REQUEST FOR NAVICAM CAPSULE ENDOSCOPE SYSTEM WITH NAVICAM STOMACH CAPSULE
REGULATORY INFORMATION
FDA identifies this generic type of device as:
Magnetically maneuvered capsule endoscopy system. A magnetically maneuvered capsule endoscopy system consists of an ingestible capsule and magnetic controller and is used for visualization of the stomach and duodenum. The ingestible capsule contains a camera that wirelessly captures images of the mucosa. The magnetic controller is used outside of the patient and is magnetically coupled with the capsule to control its location and viewing direction.
NEW REGULATION NUMBER: 21 CFR 876.1310
CLASSIFICATION: Class II
PRODUCT CODE: QKZ
BACKGROUND
DEVICE NAME: NaviCam Capsule Endoscope System with NaviCam Stomach Capsule
SUBMISSION NUMBER: DEN190037
DATE DE NOVO RECEIVED: August 13, 2019
SPONSOR INFORMATION:
AnX Robotica, Inc. 8 The Green, STE A Dover, DE 19901
INDICATIONS FOR USE
The NaviCam Stomach Capsule is intended for visualization of the stomach of adults (≥22 years old) with a BMI less than 38. The system can be used in clinics and hospitals, including ER settings.
LIMITATIONS
The sale, distribution, and use of the device are restricted to prescription use in accordance with 21 CFR §801.109.
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Limitations on device use are also achieved through the following statements included in the Instructions for Use Manual:
Capsule endoscopy (CE) is intended to provide visualization of the stomach and duodenal bulb. The device is not intended as a treatment. The advantage of this device is that it is minimally invasive and without sedation.
The primary risks of the NaviCam Capsule Endoscopy System with NaviCam Stomach Capsule are the possibilities of false positive and false negative results. Patients with a false negative CE result would not be identified as having cancerous lesions or abnormalities that would require subsequent treatment. Patients with a false positive CE result may be advised to undergo unnecessary additional evaluation.
Undergoing an MRI while the NaviCam Stomach Capsule is inside the patient's body may cause damage to the intestinal tract or abdominal cavity. If the patient did not positively verify the excretion of the NaviCam Stomach Capsule from the body, contact the physician for evaluation and possible abdominal X-ray before undergoing an MRI examination.
PLEASE REFER TO THE LABELING FOR A COMPLETE LIST OF WARNINGS, PRECAUTIONS AND CONTRAINDICATIONS.
DEVICE DESCRIPTION
The NaviCam Capsule Endoscopy System with NaviCam Stomach Capsule is an endoscopic capsule imaging system intended to obtain images of the stomach and duodenum. In contrast to passive capsule endoscopy systems, it uses external magnetic fields to allow the position of the capsule to be controlled by an operator. The NaviCam Capsule Endoscopy System with NaviCam Stomach Capsule consists of an ingestible capsule, a data recorder, a locator, and a controller.
CAPSULE
The NaviCam Stomach Capsule (AKEM-11SW) is an ingestible imaging device having an outer diameter of 12 mm and a total length of 28 mm. See image of the capsule below.
Image /page/1/Picture/9 description: The image shows two capsule endoscopy pills against a gray background. One pill is standing upright, while the other is lying on its side. The pills are white with a clear dome at one end, revealing the internal components. The capsule endoscopy pills are used to take pictures of the digestive tract.
Figure 3-2: NaviCam Stomach Capsule
The capsule captures images via a Complementary Metal-Oxide Semiconductor (CMOS) sensor. A clear top cover contains a compact objective lens in front of the CMOS. Light-emitting diodes (LEDs) and a photoresistor are allocated around the objective lens. It consists of radiofrequency
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(RF) transmitter and an antenna for radio transmission. The capsule is powered by two silver oxide batteries.
DATA RECORDER
The data recorder (AKR-1) is a portable data receiving unit powered by a built-in rechargeable lithium battery, which is placed inside an examination vest worn by the patient during examination. It is used to receive image data wirelessly transmitted from the capsule. See image of the data recorder in Figure 3-3 and image of the data recorder in the examination vest in Figure 3-4 below.
Image /page/2/Picture/3 description: The image shows a NaviCam Data Recorder. The recorder is a rectangular device with several ports on each side. There are several cables connected to the ports on each side of the recorder. The cables are connected to several small, square devices that are arranged in a grid pattern.
Image /page/2/Figure/4 description: The image shows two different views of a weighted vest worn by a person. On the left, the vest is a solid color with a logo on the chest. On the right, the vest is shown with weights inserted into the pockets. The vest appears to be designed for fitness or training purposes.
Figure 3-4: NaviCam Data Recorder in Examination Vest
LOCATOR
The locator (AKS-1) is a portable magnetic scanning device powered by a built-in rechargeable lithium battery. It is used to detect whether the capsule is inside the human body and probe its approximate position. Also, it is used to turn on the capsule before the patient ingests the capsule. See image of the locator below.
Image /page/2/Picture/8 description: The image shows a white and gray handheld metal detector. The detector has a white circular head and a gray handle with a white end. There are some buttons on the handle and the head of the detector.
Figure 3-7: NaviCam Locator
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CONTROLLER
The controller (NaviEC-1000) allows the position of the capsule to be moved in threedimensional space and is comprised of the following core components:
- . Console
- Translational rotation platform ●
- . Magnetic ball
- Examination bed
Image /page/3/Picture/6 description: The image shows a medical imaging device with several labeled components. The device includes a translational and rotational mechanism, along with a magnetic ball component. An examination bed is positioned in front of the device, and a console with monitors is located to the right.
Figure 3-5: NaviCam Controller
SUMMARY OF NONCLINICAL/BENCH STUDIES
Non-clinical/bench studies conducted on the NaviCam Capsule Endoscopy System with NaviCam Stomach Capsule device contribute to a demonstration of a reasonable assurance of safety and effectiveness of the device and are summarized below.
BIOCOMPATIBILITY/MATERIALS
The patient contacting component of the NaviCam Capsule Endoscopy System with NaviCam Stomach Capsule is the NaviCam Stomach Capsule. The capsule was evaluated with respect to its intended use per ISO 10993-1:2003, Biological evaluation of medical devices and FDA Guidance "Use of International Standard ISO 10993-1, 'Biological evaluation of medical devices – Part 1: Evaluation and testing within a risk management process'". Testing was performed on final finished devices. The following tests were performed on the NaviCam Stomach Capsule.
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- Cytotoxicity
- Sensitization ●
- Irritation
The results supported the biocompatibility of the NaviCam Capsule Endoscopy System with NaviCam Stomach Capsule.
SHELF LIFE/STERILITY
The NaviCam Stomach Capsule is provided sterilization was evaluated for conformance to ANSI/ AAMI/ ISO 11135:2014 Sterilization of health care products-Ethylene oxide- Requirements for development, validation and routine control of a sterilization process for medical devices. The expected shelf life for the NaviCam Stomach Capsule is 14 months, based on the clinical and non-clinical testing.
ELECTROMAGNETIC COMPATIBILITY AND ELECTRICAL SAFETY
Electromagnetic Compatibility (EMC):
The NaviCam Capsule Endoscopy System with NaviCam Stomach Capsule was evaluated for conformance to IEC 60601-1-2:2014 and was found to comply with all applicable requirements of this EMC testing standard.
Electrical Safety:
The NaviCam Capsule Endoscopy System with NaviCam Stomach Capsule was evaluated for conformance to ANSVAAMI ES60601-1:2015 (general requirements). Review of the results concluded that the device complies with all the electrical safety requirements specified in this standard.
SOFTWARE
The NaviCam Capsule Endoscopy System with NaviCam Stomach Capsule software functions to communicate with the NaviCam Data Recorder and to collect data from the capsule and send information to the console.
The software/firmware was reviewed according to the "Guidance for the Content of Premarket Submissions for Software Contained in Medical Devices," dated May 11, 2005. The software has a moderate level of concern.
HUMAN FACTORS
The NaviCam Capsule Endoscopy System with NaviCam Stomach Capsule was evaluated per FDA Guidance "Applying Human Factors and Usability Engineering to Medical Devices". The summative study aimed to assess the users' ability to operate the NaviCam Capsule Endoscope System with the NaviCam Stomach Capsule, to evaluate
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the adequacy of the training session to be provided to new users. and to detect the possibility of misuse. All participants received basic training and the User Manual then they were asked to perform a series of simulated use tasks using the complete system and a stomach model. The number of attempts to successfully complete the tasks were recorded by dedicated individuals. Upon completion of the tasks, each participant was requested to complete a system usability scale (SUS) questionnaire. A total of fifteen physicians from a variety of backgrounds, years of practicing medicine and experience with capsule endoscopy participated in the study. All 15 physicians successfully performed all tasks in either first or second attempt without asking for clarification or assistance. The performance goals were successfully met demonstrating that the NaviCam Capsule Endoscope System with the NaviCam Stomach Capsule can be safely and effectively use by representative users without producing patterns of failures that could result in negative clinical impact or injury to patients and users.
PERFORMANCE TESTING- BENCH
Non-clinical performance tests were conducted to demonstrate mechanical integrity and functionality of the NaviCam Capsule Endoscopy System with NaviCam Stomach Capsule. The table below (Table 1) summarizes each of these bench tests, which included appropriate acceptance criteria for the intended use of the device.
| Test | Purpose | Acceptance Criteria | Results |
|---|---|---|---|
| Bite Force | Testing was performed to determine | ||
| if the NaviCam capsule can | |||
| withstand applied force in case of | |||
| accidental biting. | The capsule should | ||
| withstand applied force | |||
| up to (b) (4) | Passed | ||
| Temperature Safety | Testing was performed to determine | ||
| the temperature change during | |||
| NaviCam capsule operation. | △T should not be more | ||
| than (b) (4) | Passed | ||
| Magnetic Force Measurement | Testing was performed to measure | ||
| the maximum value of magnetic flux | |||
| density on the surface of the | |||
| NaviCam capsule. | The acceptance criteria | ||
| for this test are: | |||
| (b) (4) | Passed | ||
| Magnetic Field Test | Testing was performed to determine | ||
| the magnetic field safety distance of | |||
| the capsule. | 1) The maximum value of | ||
| magnetic flux density on | |||
| the surface of the | |||
| NaviCam stomach | |||
| capsule must be less than | |||
| or equal to (b) (4) |
- The magnetic field of
the capsule at (b) (4)
must be less than (b) (4) | Passed |
| Battery Life | Testing was performed to determine
the use life of the battery. | The acceptable result of
the battery test is at least
(b) (4) pictures (equal to
(b) (4)hours battery life
time, (b) (4) captured by
the capsule. | Passed |
| pH Test | Testing was performed to evaluate
the integrity of the NaviCam capsule
during exposure to extreme pH
levels. | 1) After soaking, there is
no change in the capsule
weight. Considering
measurement error,
the variation in weights
obtained by the balance
shall not exceed (b) (4) - After soaking, there is
no change on the surface
of the capsule front and
rear shells. - Resolution and color
reproduction are not
affected. | Passed |
| Color
Performance | Testing was performed to evaluate
the color reproductive performance
of NaviCam capsule. | For a capsule endoscope,
because of its size, Field
of View (FOV), small
field size and the way of
imaging based on the
illumination of its built-in
LEDs, for improved
image color reproduction
the total color difference
of a sample (ΔE) should
be kept as no more than
(b) (4) | Passed |
| Image
Resolution | Testing was performed to evaluate
the image resolution of the NaviCam
capsule. | For (b) (4) working
distance, module transfer
function (MTF) (b) (4) is not
less than (b) (4) | Passed |
| Field of View | Testing was performed to determine
the FOV value of the NaviCam
capsule. | (b) (4) is
accepted, that is (b) (4)
(b) (4) degree. | Passed |
| Geometric
Distortion | Testing was performed to determine
geometric distortion of the NaviCam
capsule and provide the local
magnification of the image. | Distortion value not
larger than (b) (4) is
accepted. | Passed |
| Depth of View
(DOV) | Testing was performed to measure
the MTF in air and underwater at (b) (4)
different working distances within
the | For reflectance
USAF1951 angular
resolution test, DOV is (b) (4)
mm to (b) (4) in air or
under water. | Passed |
| Peak
Illuminance | claimed DOV range (b) (4)
using ISO 12233 slanted edge
methodology and to verify the
claimed DOV range (b) (4) in
air and under water using angular
resolution method.
Testing was performed to determine
peak illuminance value of capsule
endoscope to evaluate sufficient
illuminance from the capsule. | (b) (4) is
accepted, that is (b) (4) to
(b) (4)lux. | Passed |
| Image Intensity
Uniformity
(IIU) | Testing was performed to
demonstrate the IIU property of
optical performance | (1) The two-dimensional
distribution of the IIU
space is basically a
spatially symmetric
distribution.
(2) The four-dimensional
distribution of the IIU at (b) (4)
is
basically symmetrical
from the center.
(3) The calculated
minimum IIU value in the
four directions of (b) (4)
should not be less than (b) (4) | Passed |
| Photobiological
Safety | The testing was performed to
determine optical safety based on
maximum (worst-case) light
exposure to internal gastrointestinal
mucosa, and cover
ultraviolet, visible, and near-infrared
ranges, as appropriate. | The device must meet
light hazard exposure
limits per IEC
62471:2006. | Passed |
Table 1. Non-Clinical Completed Testing
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SUMMARY OF CLINICAL INFORMATION
Clinical data from two clinical studies and 11 articles published in scientific journals were leveraged to evaluate the safety and effectiveness of the NaviCam Capsule Endoscopy System with NaviCam Stomach Capsule.
COMPARATIVE STUDY
In a multicenter blinded study, magnetic capsule endoscopy (MCE) was compared with conventional gastroscopy in 350 patients with upper abdominal complaints scheduled to undergo gastroscopy at a tertiary center in China.1 In the study, clinicians first used the MCE system to
1 Liao, Z., et al., Accuracy of Magnetically Controlled Capsule Endoscopy, Compared With Conventional Gastroscopy, in Detection of Gastric Diseases. Clin Gastroenterol Hepatol, 2016. 14(9): p. 1266-1273.e1.
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perform CE on the subjects. Then after 2 hours the subjects underwent gastroscopy. Gastroscopy results were used as the gold standard or control in the trial. Results for detection of gastrointestinal lesions, including polyps, ulcers, and submucosal humps from the MCE and gastroscopy were used to calculate the sensitivity, specificity, positive predictive value (PPV), negative predictive value (NPV), and accuracy for gastric lesions. MCE detected gastric focal lesions in the entire stomach with 90.4% sensitivity, 94.7% specificity, PPV of 87.9%, NPV of 95.9% and 93.4% accuracy (Table 2). The detection of lesions was similar for MCE and gastroscopy (Table 3).
| Gastroscopy | ||||
|---|---|---|---|---|
| Positive | Negative | Total | ||
| MCE | Positive | 94 | 13 | 107 |
| Negative | 10 | 233 | 243 | |
| Total | 104 | 246 | 350 | |
| Specificity | 94.7% (91.9% - 97.5%) | |||
| Diagnostic Accuracy | 93.4% (90.8% - 96.0%) | |||
| PPV | 87.9% (81.7% - 94.0%) | |||
| NPV | 95.9% (93.4% - 98.4%) |
| Table 3: Detection of Focal Lesions per Type, Location, and Size (PPS) | |
|---|---|
| -- | ------------------------------------------------------------------------ |
| | Gastroscopy
Number of
patients (%) | MCE
Number of
patients (%) | Sensitivity (95%) | Specificity (95%) |
|--------------------------|------------------------------------------|----------------------------------|-------------------|-------------------|
| Lesions | | | | |
| Type | | | | |
| Polyps | 43 (12.3) | 47 (13.4) | 90.7 (82.0-99.4) | 96.7 (94.4-98.9) |
| Ulcers | 30 (8.6) | 28 (8.0) | 90.0 (73.5-97.9) | 99.6 (97.6-99.9) |
| Submucosal
humps | 18 (5.1) | 17 (4.9) | 88.9 (65.3-98.6) | 99.6 (97.6-99.9) |
| Others | 13 (3.7) | 15 (4.3) | 92.3 (64.0-99.8) | 98.7 (96.3-99.7) |
| Location | | | | |
| Upper part of
stomach | 51 (14.5) | 54 (15.4) | 90.2 (82.0-98.4) | 96.7 (94.4-98.9) |
| Lower part of
stomach | 53 (15.1) | 53 (15.1) | 90.6 (82.7-98.4) | 97.9 (96.1–99.7) |
| Size | | | | |
| 2 Zou, WB., et al., Magnetic-controlled capsule endoscopy for gastric diseases: a twocenter self-controlled comparative trial. Endoscopy, 2015. 47(6): 525-528.
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Literature
The largest observational cohort study of screening for gastric cancer with MCE included 3182 asymptomatic Chinese individuals.3 Seven patients with ulcers and suspected malignancies were referred for gastroscopy and biopsy. The MCE studies revealed seven (0.22%) patients with advanced cancer that were all confirmed as adenocarcinoma pathologically. Additional lesions included gastric ulcers (4.9%), gastric polyps (10.4%) and submucosal tumors (3.6%). At the 2week follow-up, capsule retention occurred in 27 cases; however, all patients excreted the capsule in the following 3 to 4 weeks.
In an additional self-controlled comparison study,4 ten subjects diagnosed with superficial gastric neoplasia and scheduled to undergo endoscopic submucosal dissection (ESD) at a tertiary hospital were prospectively evaluated with MCE before undergoing ESD. The diagnostic agreement of MCE, ESD and pathology were compared, including location, size and endoscopic appearance of the lesions. MCE detected 11 lesions (91.7%) in the correct location, while missing 1 neoplastic lesion at the cardia. The per-patient and per-lesion sensitivities of MCE for superficial gastric neoplasia detection were 100% and 91.7%.
There were no reports of serious adverse events in the published references.
The sponsor provided summary data to demonstrate that the NaviCam Locator is able to detect the capsule in patients. Patients were scanned with the locator a day after MCE. During the magnetic scanning, the locator was kept at a distance of within 15cm from the patient's abdomen and the scan button was pressed and held for detection. After the magnetic scanning was completed, an abdominal x-ray (patient in standing position) was carried out by another doctor. The examinations were scheduled on the 1st, 3rd, 7th and 14th day after the patient swallowed the capsule. In the study, when the capsule was still present in a patient as detected by x-ray, the locator was able to detect the presence of the capsule.
LABELING
The Sponsor provided labeling that included auser manual, patient labeling, package labels, and a promotional brochure for the NaviCam Capsule Endoscopy System with NaviCam Stomach Capsule. The user manual addresses the known hazards and risks of the device for the intended use and incorporate safety statements to mitigate these risks. The labeling includes:
- . Safety instructions intended to minimize the risk of improper use of the NaviCam Capsule Endoscopy System with NaviCam Stomach Capsule.
- . Contraindications and warnings to ensure patient and user safety in the presence of a magnetic field. This also includes an assessment form to aid users to determine if a patient has a ferromagnetic implant and should not undergo a procedure.
3 Zhao, A.J., et al., Screening for gastric cancer with magnetically controlled capsule gastroscopy in asymptomatic individuals. Gastrointest Endosc, 2018. 88(3): p. 466-474 e1.
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- The Labeling should also include the potential risk of the capsule being inadvertently aspirated during swallowing.
The patient labeling includes a summary of how the device works, how a patient should prepare for the procedure, risks associated with CE, and warnings for patients to seek medical attention, if they experience an adverse event. The patient labeling also summarizes the clinical data.
RISKS TO HEALTH
The table below identifies the risks to health that may be associated with use of the magnetically maneuvered capsule endoscopy system and the measures necessary to mitigate these risks.
| Identified Risk | Mitigation Measure |
|---|---|
| Infection | Reprocessing validation |
| Sterilization validation | |
| Labeling | |
| Adverse tissue reaction | Biocompatibility evaluation |
| Aspiration of capsule leading to injury | Labeling |
| Tissue damage | Clinical performance testing |
| Labeling | |
| Equipment malfunction leading to injury | Electrical, thermal, and mechanical safety testing |
| Software validation, verification, and hazard analysis | |
| Human factors testing | |
| Non-clinical performance testing | |
| Shelf life testing | |
| Labeling | |
| Interference with other devices (e.g., | |
| interference with image acquisition, | |
| patient information compromised, and | |
| ferromagnetic implants in users and | |
| patients) | Electromagnetic compatibility testing |
| Software validation, verification, and hazard analysis | |
| Non-clinical performance testing | |
| Labeling | |
| Failure to visualize areas of the stomach | |
| and duodenum leading to inadequate | |
| treatment | Clinical performance testing |
| Non-clinical performance testing | |
| Labeling | |
| Failure to excrete the capsule due to an | |
| obstruction resulting in abdominal pain, | |
| nausea, and vomiting | Clinical performance testing |
| Labeling |
Table 5: Identified Risks to Health and Mitigation Measures
SPECIAL CONTROLS
In combination with the general controls of the FD&C Act, the magnetically maneuvered capsule endoscopy system is subject to the following special controls:
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- Clinical performance testing with the device under anticipated conditions of use must evaluate visualization of the intended region and document the adverse event profile.
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- Non-clinical testing data must demonstrate the optical, mechanical, and functional integrity of the device under physically stressed conditions. The following performance characteristics must be tested, and detailed protocols must be provided for each test:
- i. A bite test must be performed to ensure that the capsule can withstand extreme cases of biting.
- A pH resistance test must be performed to evaluate integrity of the capsule when ii. exposed to a physiological relevant range of pH values.
- iii. A battery life test must be performed to demonstrate that the capsule's operating time is not constrained by the battery capacity.
- iv. A shelf life test must be performed to demonstrate that the device performs as intended at the proposed shelf life date.
- Optical testing must be performed to evaluate fundamental image quality V. characteristics such as resolution, field of view, depth of field, geometric distortion, signal to noise ratio, dynamic range, and image intensity uniformity.
- vi. A color performance test must be performed to compare the color differences between the input scene and output image.
- A photobiological safety analysis must be performed based on maximum (worstvii. case) light exposure to internal gastrointestinal mucosa, and covering ultraviolet, visible and near-infrared ranges, as appropriate. A mitigation analysis must be provided.
- viii. Performance testing must demonstrate that the viewing software clearly presents the current frame rate, which is either adjustable manually by the user or automatically by the device. Testing must demonstrate that the viewing software alerts the user when the video quality is reduced from nominal due to imaging data communication or computation problems.
- A data transmission test must be performed to verify the robustness of the data ix. transmission between the capsule and the receiver. This test must include controlled signal attenuation for simulating a non-ideal environment.
- Magnetic field strength testing characterization must be performed to identify the X. distances from the magnet that are safe for patients and users with ferromagnetic implants, devices, or objects.
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- Software validation, verification, and hazard analysis must be provided.
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- Electrical safety, thermal safety, mechanical safety, and electromagnetic compatibility (EMC) testing must be performed.
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- The patient-contacting components of the device must be demonstrated to be biocompatible.
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- Performance data must validate the reprocessing instructions for the reusable components of the device.
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- Performance data must demonstrate the sterility of any device components labeled sterile.
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- Human factors testing must demonstrate that the intended users can safely and correctly use the device, based solely on reading the instructions for use.
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- Clinician labeling must include:
- i. Specific instructions and the clinical and technical expertise needed for the safe use of the device:
- ii. A detailed summary of the clinical testing pertinent to use of the device, including information on effectiveness and device- and procedure-related complications;
- iii. The patient preparation procedure;
- iv. A detailed summary of the device technical parameters;
- v. Magnetic field safe zones;
- vi. A screening checklist to ensure that all patients and operating staff are screened from bringing ferromagnetic implants, devices, or objects near the external magnet:
- vii. Reprocessing instructions for reusable components;
- Shelf life for single use components; and viii.
- ix. Use life for reusable components.
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- Patient labeling must include:
- An explanation of the device and the mechanism of operation; i.
- The patient preparation procedure; ii.
- A brief summary of the clinical study; and iii.
- iv. A summary of the device- and procedure-related complications pertinent to use of the device.
BENEFIT/RISK DETERMINATION
The risks include adverse tissue reaction, damage to the intestinal tract or abdominal cavity, equipment malfunction leading to injury, electromagnetic field incompatibility or interference, poor image acquisitions, misinterpretation of the captured images and failure to excrete the capsule. Most of the identified risks have been assessed via pre-clinical testing such as biocompatibility testing, EMC, and electrical safety testing (see above). Risks associated with clinical outcomes such as misinterpretation of results and failure to excrete the capsule were evaluated in the two clinical studies as well as in numerous clinical studies performed with the device and reported in literature. The available clinical data as well as accumulated experience using the device in the European Union and China demonstrate that the NaviCam systematically produces results comparable to "gold standard" (gastroscopy/EGD procedures) and that no serious adverse events have been reported associated with failure to excrete the capsule.
The benefit of the NaviCam Endoscopy System is to provide noninvasive visualization of the stomach. Also, the rate of adverse events associated with the NaviCam is extremely low, with the majority of complaints associated with the procedure preparation process rather than with the capsule procedure itself. Among the 11 studies using the device, there are a few, which
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specifically evaluate the use of the device for identification of pathologic lesions. The assurance of a true negative finding is an important metric of effectiveness and the NPV demonstrated in the clinical studies to support MCE was greater than 95%. In addition, MCE did not miss any clinically significant lesions. However, because there is still a possibility of missing a clinically significant lesion, a warning was added to the labeling that a normal or negative study does not eliminate the possibility of the missing a significant lesion.
Based on the study with 350 patients with upper GI symptoms who underwent both MCE and upper endoscopy the sensitivity and NPV for detecting the same abnormality 90.2% and 95.9%, respectively. An additional benefit is the potential to avoid the need for sedation and an endoscopic examination. The risks of the NaviCam Capsule Endoscopy System with NaviCam Stomach Capsule are the potential for a small bowel obstruction in patients that are predisposed to small bowel obstruction and the possible failure to visualize significant gastric lesions. Based on these known benefits and primarily potential risks the benefits of the device as a tool to visualize the stomach outweigh the risks.
Patient Perspectives
Risk tolerance varies amongst patients and affects individual patient decisions as to whether risks are acceptable in exchange for a probable benefit. In the clinical study conducted on 350 patients, a patient acceptance evaluation was performed. This evaluation revealed that from the 350 patients who have completed the two examinations, 335 (95.7%) preferred the NaviCam over traditional gastroscopy. Only 4 (1.1%) preferred traditional gastroscopy and 11 (3.1%) had no inclination. The low risk nature of the device, the patient acceptance results, and the opportunity to avoid sedation , has been shown to result in a positive patient perspective with preference for the minimally invasive and well tolerated procedure of the NaviCam Capsule Endoscopy System with NaviCam Stomach Capsule as compared to upper endoscopy with sedation.
Benefit/Risk Conclusion
In conclusion, given the available information above, the data support that for the indications for use stated above, the probable benefits outweigh the probable risks for the NaviCam Capsule Endoscopy System with NaviCam Stomach Capsule. The device provides benefits and the risks can be mitigated using general controls and the identified special controls.
CONCLUSION
The De Novo request for the NaviCam Capsule Endoscopy System with NaviCam Stomach Capsule is granted and the device is classified under the following:
Product Code: OKZ Device Type: Magnetically maneuvered capsule endoscopy system Class: II Regulation: 21 CFR 876.1310