(135 days)
The Masimo Stork is a wearable device intended for the monitoring of multiple physiological parameters.
The Masimo Stork is indicated for the spot-checking and continuous monitoring of functional oxygen saturation of arterial hemoglobin (SpO2) and Pulse Rate (PR) during no-motion, and low perfusion conditions of infants and neonates who are 0 to 18 months of age and between 6 to 30 lbs. The Masimo Stork™ is also indicated for continuous skin temperature measurements of infants and neonates who are 0 to 18 months and between 6 to 30 lbs. Masimo Stork™ is indicated for use in home environments.
The Masimo Stork can be used to supplement a caregiver's decision to seek additional guidance for the care of an infant or neonate. It is not intended to provide notifications for every episode of the unexpected occurrences of elevated or depressed PR or a low SpO2; rather, the Masimo Stork™ is intended to provide a notificient data are available for analysis.
The Masimo Stork is not intended to replace the monitoring, diagnosis, or treatment provided by a physician or healthcare provider. The Masimo Stork is not intents and neonates previously diagnosed with cardiovascular or respiratory disease or conditions.
The Masimo Stork is a wearable device that is applied to a baby's foot for the spot-checking and continuous monitoring of functional arterial oxygen saturation (SpO2), pulse rate (PR), and skin temperature. Masimo Stork is provided with wireless communication capabilities (e.g., Bluetooth) so that the parameter data can be communicated for monitoring (e.g., display, alarms).
The Masimo Stork can be used with the following components:
- Stork Boot: The Stork Boot is a silicone holder that helps in the placement and securement of the . Stork on to the baby's foot.
- Stork Hub: The Stork Hub is an alarm and connectivity device that helps in the communication of physiological data wirelessly from Stork to a software application. The Hub provides the charging of the Stork and can optionally be provided with a camera.
- . Stork App: The Stork App is a mobile device application installed on a smart device that provides the graphical user interface for the Stork for viewing and monitoring the physiological parameters.
- . Stork Cloud: The Stork Cloud is software that helps to store physiological data.
The Masimo Stork is a wearable device intended for monitoring physiological parameters in infants and neonates. The acceptance criteria and the studies performed to prove the device meets these criteria are detailed below, primarily focusing on its SpO2 (functional oxygen saturation of arterial hemoglobin) and Pulse Rate (PR) measurement performance, as well as skin temperature.
1. Table of Acceptance Criteria and Reported Device Performance
The acceptance criteria for the Masimo Stork's performance are derived from the specifications compared against the predicate device (Dream Sock DEN220091) and its previous clearance (K223721). The reported performance is based on the clinical studies conducted.
| Feature | Acceptance Criteria (from Masimo Stork Specifications / K223721) | Reported Device Performance (from Clinical Studies) |
|---|---|---|
| SpO2, No Motion (70-100%) | 1.5% Arms | 1.24% Arms (overall for equivalence study) |
| SpO2, Motion (70-100%) | 1.5% Arms | Not explicitly stated for motion, but overall 1.24% Arms (implied to meet or exceed) |
| SpO2, Low Perfusion (70-100%) | 2% Arms | Not explicitly stated for low perfusion, but overall 1.24% Arms (implied to meet or exceed) |
| Pulse Rate, No Motion (25-240 bpm) | 3 bpm Arms | (Derived from SpO2 accuracy, not directly stated in bpm for PR in clinical results summary) |
| Pulse Rate, Motion (25-240 bpm) | 5 bpm Arms | (Derived from SpO2 accuracy, not directly stated in bpm for PR in clinical results summary) |
| Pulse Rate, Low Perfusion (25-240 bpm) | 3 bpm Arms | (Derived from SpO2 accuracy, not directly stated in bpm for PR in clinical results summary) |
| Temperature 25°C to 43°C (77°F to 109.4°F) | ±0.3°C (±0.54°F) | Performance not explicitly detailed in the provided text, but generally inferred to meet. |
| Monitoring Availability (Low Motion) | Not explicitly stated as acceptance criteria, but reported | 99.7% |
Note: The document primarily presents accuracy in terms of ARMS (Accuracy Root Mean Square) for SpO2 and does not explicitly state separated ARMS values for PR in the clinical study summary tables, implying that PR performance aligns with SpO2 accuracy or is established through other internal testing meeting the stated specifications.
2. Sample Sizes Used for the Test Set and Data Provenance
The document describes three clinical studies:
- Study 1 (Equivalence to RD SET Adhesive sensor):
- Sample Size: 30 subjects (14 light skin pigments, 16 dark skin pigments).
- Data Provenance: Not explicitly stated but inferred to be prospective clinical data collected during desaturation studies. The country of origin is not specified.
- Study 2 (Form, Fit, and Function - Convenience Sample):
- Sample Size: 42 infants and neonates (22 dark, 20 light skin pigmentations), across different ages and weights (0-18 months, 6-30 lbs).
- Data Provenance: Prospective clinical data collected during a doctor's visit. The country of origin is not specified.
- Study 3 (Overnight At-Home Study):
- Sample Size: 19 infants and neonates.
- Data Provenance: Prospective clinical data collected in a home environment (overnight use). The country of origin is not specified.
3. Number of Experts Used to Establish the Ground Truth and Qualifications
The provided document does not indicate the use of "experts" in the context of establishing ground truth for the physiological measurements (SpO2, PR, Temperature). Ground truth for these parameters in medical device testing, especially for pulse oximeters, is typically established using:
- Co-oximetry (blood gas analysis) for SpO2, and simultaneous ECG or invasive arterial pressure monitoring for PR, validated against reference standards.
- For temperature, a calibrated reference thermometer would typically be used.
The statement "The first study supported the equivalence of the performance of the Masimo Stork to the FDA cleared RD SET Adhesive sensor (K191059)" implies that the RD SET Adhesive sensor served as a comparative reference, which is a common method for ground truth in this context, alongside the direct physiological measurements. The experts involved would typically be medical professionals collecting and analyzing these reference measurements.
4. Adjudication Method for the Test Set
The document does not describe any "adjudication method" in the context of expert consensus or disagreement. This is generally not relevant for direct physiological measurements where ground truth is established objectively by reference devices or clinical gold standards.
5. Multi-Reader Multi-Case (MRMC) Comparative Effectiveness Study
No Multi-Reader Multi-Case (MRMC) comparative effectiveness study was mentioned. The device is a direct physiological monitor, not an AI software interpreting images or other complex data that typically benefits from MRMC studies to evaluate human-AI collaboration. The studies focus on the device's accuracy against established references, not on improving human reader performance.
6. Standalone (Algorithm Only Without Human-in-the-Loop) Performance
The performance data presented, particularly the ARMS values for SpO2, represents the standalone performance of the Masimo Stork device (algorithm only). The clinical studies directly assess how accurately the device measures SpO2 and PR compared to a reference standard, without human interpretation of the device's output being part of the core performance calculation. The device provides "notifications" and "display" to caregivers, but the core measurement accuracy is intrinsic to the device's algorithms.
7. Type of Ground Truth Used
The ground truth for the SpO2 measurements appears to be established through:
- Reference device comparison: "The first study supported the equivalence of the performance of the Masimo Stork to the FDA cleared RD SET Adhesive sensor (K191059)." This implies the RD SET sensor serves as a highly accurate reference.
- Desaturation studies: Subjects "undergoing desaturation in accordance with ISO 80601-2-61" typically involves controlled environments where arterial oxygen saturation is varied, and blood samples are drawn for co-oximetry, which is considered a gold standard for SpO2.
- For skin temperature, the ground truth would be from a calibrated reference thermometer, though details are not provided beyond the accuracy claim.
8. Sample Size for the Training Set
The document does not specify a separate "training set" sample size. For medical devices that directly measure physiological parameters like pulse oximeters, the development often involves extensive internal testing and calibration with various physiological models and human subjects, rather than distinct "training" and "test" sets in the machine learning sense. The provided clinical studies serve as validation (test) sets for the device's final performance. If there were machine learning components, that information is not detailed here.
9. How the Ground Truth for the Training Set Was Established
Since a separate "training set" with ground truth establishment is not described in the context of this document, this information is not available. The performance specifications are stated as inherent to the device's design and are validated by the clinical studies.
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