K Number
K974819Device Name
SELECTCELLS(TM) MINIManufacturer
Date Cleared
1998-03-23
(90 days)
Product Code
Regulation Number
884.1175Type
TraditionalReference & Predicate Devices
Predicate For
AI/MLSaMDIVD (In Vitro Diagnostic)TherapeuticDiagnosticis PCCP AuthorizedThirdpartyExpeditedreview
Intended Use
Biopsy to obtain a sample for histologic evaluation of the endometrium (uterine mucosal lining) or sample extraction of the uterine menstrual content for:
- Evaluation of infertility conditions, menstrual disorders, postmenopausal bleeding, abnormal cytology suggesting endometrial origin, hormonal replacement therapy (HRT);
- Detection of endometrial carcinoma (Please note: The most reliable method for the detection of endometrial carcinoma is dilation of the cervix and uterine curettage performed under general anesthesia);
- Evaluation of luteal defect (Evaluation of luteal defect is visually determined histologically from endometrial tissue obtained only during the secretory [progestational] phase of the menstrual cycle);
- Endometrial dating;
- Microscopic examination;
- and, this device is useful for patients presenting a narrow cervix or cervical canal and in postmenopausal women whose cervix might be narrower However, because of its smaller with any of the indications listed above. diameter, it should be recognized that the amount (quantity) of sample obtained with this device will be reduced.
Device Description
The SelectCells Mini, like the Pipelle, comprises a long clear, flexible, polypropylene sheath and a rod made of acetal copolymer onto which a piston is molded.
The sheath of the SelectCells Mini is a one part tube whose distal half has a smaller diameter than its proximal half. The sheath of the Pipelle is a one part tube with the same diameter throughout.
The device opening, by which the specimen is to be aspirated, is located at 2.5 mm distance (3 mm for Pipelle®) from the extreme distal tip of the sheath. The extreme distal end of the sheath is rounded and closed.
A piston is molded on the rod at almost its half length point (piston located at the distal end of the rod for Pipelle). This rod can be moved forward and backward within the proximal half length of the sheath lumen. The piston and rod are prevented from being totally withdrawn from the sheath during manipulation by the tapered proximal lumen end of the sheath (for Pipelle, by an identation in the sheath located at its proximal end).
The new device has an ergonomic 2.5 cm long finger grip which is molded onto the rod that protrudes the proximal end of the sheath. The Pipelle has a cylindrical 2.4 cm long knob which is glued to the rod that protrudes the proximal end of the sheath. This finger grip (Knob, for Pipelle) is used to move the rod within the sheath.
The SelectCells™Mini bears seven (7) coloured graduation marks with figures that are placed at 4. 5. 6. 7. 8. 9. and 10 cm distance from the extreme distal tip of the sheath. The predicate device bears four (4) coloured graduation marks with figures and three (3) marks in the form of a line that are placed at 4, 5, 6, 7, 8, 9 and 10 cm distance from the extreme distal tip of the sheath. The new and predicate devices bear an arrow on their sheaths indicating the location of the device opening. The graduation marks on the sheath serve as a guide for insertion depth of the device into the uterine cavity.
AI/ML Overview
The provided document describes the SelectCells™ Mini, an endometrial sampling device, and compares it to a predicate device, the Pipelle®. The study aims to demonstrate substantial equivalence to the predicate device.
Here's an analysis of the acceptance criteria and study details:
1. Table of acceptance criteria and the reported device performance
| Acceptance Criteria Category | Specific Metric | Predicate Device Performance (Pipelle®) | New Device Performance (SelectCells™ Mini) | Acceptance Criteria/Conclusion |
|---|---|---|---|---|
| Non-clinical Performance | Negative Pressure Generated (Endometrial Suction) | Average of 19.3 mm of water | Average of 20.1 mm of water | The new device generates slightly more negative pressure, indicating it can suction an endometrial specimen as well as the predicate device. Conclusion: Substantially equivalent. |
| Tensile Force | Average of 13.9 lbs | Average of 13.7 lbs | Tensile force results are equivalent as both devices are made of the same material. Conclusion: Safe and efficacious, substantially equivalent. | |
| Tensile Strength | Average of 4010 PSI | Average of 3940 PSI | Varies by less than 2% and is statistically insignificant. Conclusion: Safe and efficacious, substantially equivalent. | |
| Elongation at Break | Average of 605% | Average of 364% | The new device has one-half the elongation of the predicate device. All breaks in the new device occurred at the region proximal to the change in diameter. Note: Neither device is subjected to these forces during use, so this difference is deemed acceptable. Conclusion: Substantially equivalent. | |
| Clinical Performance | Concordance of Pathology Reports (Diagnosis) | N/A (within-patient comparison) | N/A (within-patient comparison) | In all 10 successful samplings, pathology reports were concordant as to the diagnosis obtained with either device. Conclusion: Efficacious, substantially equivalent. |
| Preservation of Histologic Detail | N/A (within-patient comparison) | N/A (within-patient comparison) | Comparable from both devices. Conclusion: Efficacious, substantially equivalent. | |
| Histologic Grade Results | N/A (within-patient comparison) | N/A (within-patient comparison) | Histologic grade results favor the predicate device but not more than by one and one half grades. These differences do not affect efficacy as diagnoses were concordant. Conclusion: Efficacious, substantially equivalent. | |
| Sample Size (Quantity) | N/A (within-patient comparison) | N/A (within-patient comparison) | The predicate device produced a larger sample size than the new device. Note: This is expected due to the new device's smaller diameter, and is deemed acceptable as diagnostic concordance was maintained. Conclusion: Efficacious, substantially equivalent. | |
| Patient Comfort (Cramping, Bleeding, Pain) | N/A (within-patient comparison) | N/A (within-patient comparison) | The new device provided greater patient comfort, producing less cramping, cervical bleeding, cervical, and uterine pain. Conclusion: Safer and more comfortable. | |
| Adverse Events/Complications | None reported | None reported | No Protocol deviations, adverse events or complications occurred with either device. Conclusion: Safe, substantially equivalent. |
2. Sample size used for the test set and the data provenance
- Sample Size: 10 patients (after excluding 2, from an initial recruitment of 12). Each patient underwent two samplings, one with the new device and one with the predicate device, for a total of 20 endometrial samplings.
- Data Provenance: The document does not explicitly state the country of origin. The study was a prospective, randomized clinical study.
3. Number of experts used to establish the ground truth for the test set and the qualifications of those experts
The document states: "the pathology reports were concordant as to the diagnosis obtained with either sampling device." This implies the "ground truth" (pathological diagnosis) was established by pathologists reviewing the collected specimens.
- Number of experts: Not specified (implied to be one or more pathologists per sample).
- Qualifications of experts: Not specified, but generally, pathologists are medical doctors with specialized training and certification in diagnosing diseases by examining tissues and bodily fluids.
4. Adjudication method for the test set
The document does not detail an adjudication method beyond stating that "the pathology reports were concordant as to the diagnosis." This suggests that the diagnoses from each device for a given patient were independently assessed and matched, or possibly that a single pathologist reviewed both samples from a patient and provided a single diagnostic outcome for each. There is no mention of a majority vote or formal adjudication process if there were discrepancies.
5. If a multi reader multi case (MRMC) comparative effectiveness study was done, If so, what was the effect size of how much human readers improve with AI vs without AI assistance
There was no MRMC comparative effectiveness study done, and this study does not involve AI assistance. It is a comparison between two physical medical devices.
6. If a standalone (i.e. algorithm only without human-in-the loop performance) was done
This is not applicable as the device is a physical endometrial sampling tool, not an algorithm or AI system.
7. The type of ground truth used
The primary ground truth used for efficacy was pathology reports/histological biopsy for diagnostic concordance and preservation of histologic detail.
8. The sample size for the training set
This is not applicable as the device is a physical medical instrument, not an AI/ML algorithm that requires a training set.
9. How the ground truth for the training set was established
This is not applicable for the same reason as above.
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K974819
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SELECT MEDICAL SYSTEMS INC.
Section N
Page 1 of 5
Food and Drug Administration Center For Devices and Radiological Health (HFZ-401) 9200 Corporate Boulevard Rockville MD 20850
MAR 2 3 1998 510(k)Summary
| Submitter | Select Medical Systems, Inc<br>2 Winter Sport Lane<br>P.O. Box 966<br>Williston VT 05495-0966<br>Ph (802) 862-1017 Fx (802) 862-3767 |
|----------------------------|--------------------------------------------------------------------------------------------------------------------------------------|
| Contact person | Monique Girard |
| Date of Summary | 12-22-97<br>MM DD YY |
| Device proprietary name | SelectCells™ Mini |
| Device common name | Endometrial sampling device |
| Device classification name | Endometrial suction curette (per 21 CFR section 884.1175) |
| Predicate device name | Pipelle® |
This summary of 510(k) safety and effectiveness information is being submitted in accordance with the requirements of SMDA 1990 and 21 CFR 807.92(c).
## Intended use
Same as the Pipelle® (predicate device), the SelectCells™Mini (new device) is a single use, sterile, disposable endometrial sampling device designed to be used for obtaining a histologic biopsy of the uterine mucosal lining or specimen of the uterine menstrual content. The specimen obtained is then used for the following: (i) evaluation of infertility conditions, menstrual disorders, postmenopausal bleeding, abnormal cytology suspected of being of endometrial origin, hormonal replacement therapy; (ii) detection of endometrial carcinoma; (iii) diagnosis of luteal defect; (iv) endometrial dating and,(v) microscopic examination.
## Description of new device and comparison with predicate device
The SelectCells Mini, like the Pipelle, comprises a long clear, flexible, polypropylene sheath and a rod made of acetal copolymer onto which a piston is molded.
The sheath of the SelectCells Mini is a one part tube whose distal half has a smaller diameter than its proximal half. The sheath of the Pipelle is a one part tube with the same diameter throughout.
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The device opening, by which the specimen is to be aspirated, is located at 2.5 mm distance (3 mm for Pipelle®) from the extreme distal tip of the sheath. The extreme distal end of the sheath is rounded and closed.
A piston is molded on the rod at almost its half length point (piston located at the distal end of the rod for Pipelle). This rod can be moved forward and backward within the proximal half length of the sheath lumen. The piston and rod are prevented from being totally withdrawn from the sheath during manipulation by the tapered proximal lumen end of the sheath (for Pipelle, by an identation in the sheath located at its proximal end).
The new device has an ergonomic 2.5 cm long finger grip which is molded onto the rod that protrudes the proximal end of the sheath. The Pipelle has a cylindrical 2.4 cm long knob which is glued to the rod that protrudes the proximal end of the sheath. This finger grip (Knob, for Pipelle) is used to move the rod within the sheath.
The SelectCells™Mini bears seven (7) coloured graduation marks with figures that are placed at 4. 5. 6. 7. 8. 9. and 10 cm distance from the extreme distal tip of the sheath. The predicate device bears four (4) coloured graduation marks with figures and three (3) marks in the form of a line that are placed at 4, 5, 6, 7, 8, 9 and 10 cm distance from the extreme distal tip of the sheath. The new and predicate devices bear an arrow on their sheaths indicating the location of the device opening. The graduation marks on the sheath serve as a guide for insertion depth of the device into the uterine cavity.
### Function of the device
As the Pipelle, the SelectCells Mini is to be used to remove material from the endometrium and from the mucosal lining of the uterine cavity by suctioning. The specimen obtained is then used for histologic biopsy or microscopic examination.
With the patient in position: the uterus is probed for depth and direction with a uterine sound. The uterine cervix lip is grasped with the proper instrument and according to its direction. The cervical curvature is straightened.
The device, with the piston rod fully depressed at the extreme distal end of the sheath, is inserted into the uterus up to the fundus (according to its depth as previously determined).
The piston is moved toward the proximal end of the sheath by pulling the piston rod until it stops. The device is then rotated through 360 degrees while making a gentle "to and fro" movement a few times. This procedure creates a negative pressure inside the sheath aspirating the sample into the sheath lumen through the device opening.
The device is then slowly withdrawn from the uterus. The sample is expelled in a specimen receptacle and sent to the laboratory for analysis.
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# Technical characteristics - Comparison summary between new and predicate devices
| | SelectCells™ Mini (new device) | Pipelle® (predicate device) |
|----------------------------------------------------------------|----------------------------------------------------------------------------------------------------------|--------------------------------------------|
| Length | 29.8 cm (overall)<br>25.6 cm (effective) | 26.5 cm (overall)<br>23.5 cm (effective) |
| I.D. (inner diameter)<br>O.D. (outer diameter)<br>I.D.<br>O.D. | 1.5 mm (distal 13 cm)<br>1.9 mm (distal 13 cm)<br>2.6 mm (proximal 13.7 cm)<br>3.1 mm (proximal 13.7 cm) | 2.6 mm (throughout)<br>3.1 mm (throughout) |
The minor difference in length and smaller distal 13 cm I.D. and O.D. do not affect the function, safety and efficacy of the new device as demonstrated in the Clinical Performance Data below. The new device has been designed with a smaller diameter on its distal portion to ease insertion and increase patient comfort during the procedure.
| | SelectCells™ Mini (new device) | Pipelle® (predicate device) |
|---------------------|------------------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------|
| Graduation<br>marks | At 4, 5, 6, 7, 8, 9, and 10 cm distance<br>from the extreme distal tip of the<br>sheath.<br>An arrow indicating location of device<br>opening. | At 4, 5, 6, 7, 8, 9 and 10 cm<br>distance from the extreme<br>distal tip of the sheath.<br>An arrow indicating location<br>of device opening. |
The new device bears seven (7) graduation marks with figures as compared to the predicate device which has four (4) marks with figures and three (3) in the form of a line making the graduation marks clearer on the new device than the predicate device.
| | SelectCells ™ Mini (new device) | Pipelle® (predicate device) |
|-----------------------|--------------------------------------------------------------------------------|--------------------------------------------|
| Rod stop<br>mechanism | Proximal sheath end is tapered | Proximal sheath end bears<br>an identation |
| Rod grip | Molded finger grip | Glued knob |
| | These differences are minor and reflect only a preference in<br>manufacturing. | |
| Piston location | At half length on the rod | At distal end of the rod |
Because the new device has a smaller diameter on almost half of the sheath distal portion than its proximal portion, the piston had to be molded at half length point on the rod. This difference is minor and safety/efficacy performance of the new device is not affected as demonstrated in the Clinical Performance Data below.
| Design | Similar to Pipelle | Similar to SelectCells Min |
|-----------|--------------------|----------------------------|
| Materials | Similar to Pipelle | Similar to SelectCells Min |
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1974819
Section N Page 4 of 5
Non-clinical performance data
SelectCells™ Mini (new device)
Negative pressure
Average of 20,1 mm of water
Pipelle® (predicate device)
Average of 19.3 mm of water
The amount of negative pressure generated by the new and predicate devices was evaluated by an independent testing laboratory. On five sterile specimens of each device, negative pressure data were taken in triplicate using an open-tube water manometer. The sampling end (distal end) of the device was positioned to a designated position ensuring that each specimen was tested with the same amount of head space and displaced volume. A pressure relief valve was then opened to relieve any pressure built up in the system due to insertion of the device. Each measurement was obtained upon device piston rod displacements of ten centimeters. With the relief valve closed, the piston rod was pulled back continuously, until the maximum of ten centimeters on the devices' graduation marking was reached. The difference in the water levels in the manometer was then documented.
The reproducibility of the measurements was found to be very acceptable. Based on the data, it is apparent the negative pressure amount produced by the SelectCells Mini is greater than the negative pressure amount produced by the Pipelle.
These results indicate that the new device generates slightly more negative pressure than the predicate device thus, is able to suction an endometrial specimen as well as the predicate device. The Clinical Performance Data section supports this statement as well.
In conclusion, the results indicate that the new device is substantially equivalent to the predicate device.
| | SelectCells™ Mini (new device) | Pipelle® (predicate device) |
|---------------------|--------------------------------|-----------------------------|
| Tensile force | Average of 13.7 lbs | Average of 13.9 lbs |
| Tensile strength | Average of 3940 PSI | Average of 4010 PSI |
| Elongation at break | Average of 364% | Average of 605% |
The tensile properties of the new and predicate devices were evaluated by an independent laboratory per ASTM D 638-96. Five sterile specimens of each device were tested. The initial test used a 7" and 6" grip separation for the new device and the predicate device respectively. Due to the elongation properties of polypropylene beyond the limits of the universal tester. testing was performed under modified ASTM D 638-96 by choosing a smaller grip separation of 3.5".
Tensile force results are equivalent because both devices are made of the same material. There is no question regarding safety and efficacy of the new device compared to the predicate device as the results are equivalent. Tensile strength results, which measures a finite point on a cross section of the products, vary by less than 2% and are statistically insignificant. As expected, the new device has one half elongation of the predicate device as its diameter stepped down at its half way point. All breaks in the new device occurred at the region proximal to the change in diameter.
Neither the SelectCells Mini nor the Pipelle are subjected to any tensile force, strength, or elongation while using the product for endometrial sampling.
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Section N Page 5 of 5
## Clinical performance data
The safety and efficacy of the new device have been evaluated in a clinical study. To demonstrate that the new device provides an adequate endometrial specimen for a histological biopsy of the endometrium, a blind, controlled, prospective, randomized clinical study has been conducted on 10 patients.
Twelve (12) female patients aged 18 years or older having a clinical indication for endometrial sampling were recruited for the study. Results from two (2) patients were excluded as one patient could not be sampled with either device due to a cervical obstruction while the other patient had inadequate tissue obtained with both devices to evaluate.
Twenty (20) endometrial samplings were performed. Each of the ten (10) patients had her endometrium sampled twice. Five (5) patients were sampled with the new device followed by sampling with the predicate device. The other five (5) patients were sampled with the predicate device followed by sampling with the new device. Each patient served as her own control in order to eliminate any variations from patient to patient as to the sample produced.
No Protocol deviations, adverse events or complications occurred which demonstrate the safety of the new device.
In all ten (10) patients who had successful endometrial samplings, the pathology reports were concordant as to the diagnosis obtained with either sampling device. Results on preservation of histologic detail are comparable from both devices. It appears that the sequence of sampling had an effect but in none of the cases was the difference greater than one grade. As expected, the predicate device produced a larger sample size than the new device. The histologic grade results favor the predicate device but not more than by one and one half grades. These differences in the results do not afficacy of the new device as all the ten patient pathology reports demonstrate concordant diagnoses of paired specimens.
The specimen preservation is uniform throughout the specimens.
The new device provided greater patient comfort than the predicate device. The new device produced less cramping, cervical bleeding, cervical and uterine pain than the predicate device.
Based on the results of the Clinical Study, it can be concluded that the new device is substantially equivalent to the predicate device. The new device performed better than the predicate device in terms of patient comfort and diminished intensity of symptoms produced by the procedure itself.
### Substantial equivalence
The intended use, function and technical characteristics along with results obtained from the non-clinical and clinical tests indicate that the new device. the SelectCells™ Mini is substantially equivalent in safety, effectiveness and performance to the predicate device, the Pipelle®.
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Food and Drug Administration 9200 Corporate Boulevard Rockville MD 20850
# MAR 2 3 1998
Ms. Monique Girard Regulatory Affairs Manager Select Medical Systems, Inc. 2 Winter Sport Lane P.O. Box 966 Williston, VT 05495-0966
Re: [K974819](https://510k.innolitics.com/search/K974819)
SelectCells™ Mini (Endometrial Suction Curette and Accessories) Dated: December 22, 1997 Received: December 23, 1997 Regulatory Class: II 21 CFR 884.1175/Procode: 85 HHK
Dear Ms. Girard:
We have reviewed your Section 510(k) notification of intent to market the device referenced above and we have determined the device is substantially equivalent (for the indications for use stated in the enclosure) to devices marketed in interstate commerce prior to May 28, 1976, the enactment date of the Medical Device Amendments, or to devices that have been reclassified in accordance with the provisions of the Federal Food, Drug, and Cosmetic Act (Act). You may, therefore, market the device, subject to the general controls provisions of the Act. The general controls provisions of the Act include requirements for annual registration, listing of devices, good manufacturing practice, labeling, and probibitions against misbranding and adulteration.
If your device is classified (see above) into either class III (Special Controls) or class III (Premarket Approval), it may be subject to such additional controls. Existing major regulations affecting your device can be found in the Code of Federal Regulations, Title 21, Parts 800 to 895. A substantially equivalent determination assumes compliance with the Current Good Manufacturing Practice requirements, as set forth in the Quality System Regulation (OS) for Medical Devices: General regulation (21 CFR Part 820) and that, through periodic QS inspections, the Food and Drug Administration (FDA) will verify such assumptions. Failure to comply with the GMP regulation may result in regulatory action. In addition, FDA may publish further announcements concerning your device in the Federal Register. Please note: this response to your premarket notification submission does not affect any obligation you might have under sections 542 of the Act for devices under the Electronic Product Radiation Control provisions, or other Federal laws or regulations.
This letter will allow you to begin marketing your device as described in your 510(k) premarket notification. The FDA finding of substantial equivalence of your device to a legally marketed predicate device results in a classification for your device and thus, permits your device to proceed to the market.
If you desire specific advice for your device on our labeling regulation (2) CFR Part 801 and additionally 809.10 for in vitro diagnostic devices), please contact the Office of Compliance at (301) 594-4613. Additionally, for questions on the promotion and advertising of your device, please contact the Office of Compliance at (301) 594-639. Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21 CFR 807.97). Other general information on your responsibilities under the Act may be obtained from the Division of Small Manufacturers Assistance at its toll-free number (800) 638-2041 or (301) 443-6597 or at its Internet address "http://www.fda.gov/cdrh/dsmaldsmamain.html".
Sincerely yours
Lillian Yin, Ph.D.
Director, Division of Reproductive, Abdominal, Ear, Nose and Throat and Radiological Devices Office of Device Evaluation Center for Devices and Radiological Health
Enclosure
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Page 1
510 (k) NUMBER (IF KNOWN) : [K974819](https://510k.innolitics.com/search/K974819)
DEVICE NAME: SelectCells™ Mini
INDICATIONS FOR USE:
Biopsy to obtain a sample for histologic evaluation of the endometrium (uterine mucosal lining) or sample extraction of the uterine menstrual content for:
- Evaluation of infertility conditions, menstrual disorders, postmenopausal bleeding, abnormal cytology suggesting endometrial origin, hormonal replacement therapy (HRT);
- Detection of endometrial carcinoma (Please note: The most reliable method for the detection of endometrial carcinoma is dilation of the cervix and uterine curettage performed under general anesthesia);
- Evaluation of luteal defect (Evaluation of luteal defect is visually determined histologically from endometrial tissue obtained only during the secretory [progestational] phase of the menstrual cycle);
- Endometrial dating;
- Microscopic examination;
- and, this device is useful for patients presenting a narrow cervix or cervical canal and in postmenopausal women whose cervix might be narrower However, because of its smaller with any of the indications listed above. diameter, it should be recognized that the amount (quantity) of sample obtained with this device will be reduced.
Rev. 1 March 23, 1998
t
(PLEASE DO NOT WRITE BELOW THIS LINE-CONTINUE ON ANOTHER PAGE IF NEEDED.)
Concurrence of CDRH, Office of Device Evaluation (ODE)
OR
Prescription Use ﻟﺴﺎ (Per 21 CFR 801.109) Over-The-Counter-Use (Optional Format 1-2-96)
Riker D. Satkin/
(Division Sign-Off) Division of Reproductive, Abdominal, ENT, and Radiological Devices 510(k) Number
§ 884.1175 Endometrial suction curette and accessories.
(a)
Identification. An endometrial suction curette is a device used to remove material from the uterus and from the mucosal lining of the uterus by scraping and vacuum suction. This device is used to obtain tissue for biopsy or for menstrual extraction. This generic type of device may include catheters, syringes, and tissue filters or traps.(b)
Classification. Class II (performance standards).