PROPORTIONAL SOLENOID VALVE

K922102 · Puritan Bennett Corp. · CBK · Sep 15, 1994 · Anesthesiology

Device Facts

Record IDK922102
Device NamePROPORTIONAL SOLENOID VALVE
ApplicantPuritan Bennett Corp.
Product CodeCBK · Anesthesiology
Decision DateSep 15, 1994
DecisionST
Submission TypeTraditional
Regulation21 CFR 868.5895
Device ClassClass 2
AttributesTherapeutic

Device Story

The PB-PSOL is a proportional solenoid valve assembly used within ventilators to regulate air and oxygen flow. It consists of two internal valves mounted to a common base. Operation involves applying current to a copper wire coil, creating a magnetic field that moves an armature and poppet assembly to open or close gas flow paths. The device is controlled by the ventilator's microprocessor, which uses feedback from flow and pressure transducers to adjust valve position and breath delivery characteristics. It is intended for integration into existing ventilator systems (e.g., 7200 Series) to maintain specified ventilatory therapy. The device benefits patients by ensuring precise gas delivery as determined by clinician settings.

Clinical Evidence

Bench testing only. Component-level testing performed on 15 valves against Proportional Valve Specifications; all met acceptance criteria. 10 valves passed life testing. System-level evaluation conducted by installing 15 valves into 7200ae ventilators and testing 130 performance characteristics using a System Performance and Service Tester (SPST), including 7 sections specific to PSOL function. Results confirmed performance per specification and functional equivalence to the predicate.

Technological Characteristics

Proportional solenoid valve assembly; copper wire coil, nonmagnetic poppet and seat. Operates via electromagnetic actuation of armature. Flow-versus-current curve is approximately linear. Designed for integration into 7200 Series ventilators. No software or hardware modifications required for installation.

Indications for Use

Indicated for use as a component within ventilators to deliver medical gases to patients in the proper volume, flow rate, pressure, and mixture.

Regulatory Classification

Identification

A continuous ventilator (respirator) is a device intended to mechanically control or assist patient breathing by delivering a predetermined percentage of oxygen in the breathing gas. Adult, pediatric, and neonatal ventilators are included in this generic type of device.

Predicate Devices

Reference Devices

Submission Summary (Full Text)

{1} MAR 19 1997 K922102 # 510(k) SUMMARY Per the Safe Medical Devices Act of 1990, the following summary of Puritan-Bennett Corporation's Proportional Solenoid Valve (PB-PSOL) premarket notification is provided for public dissemination. The purpose of pneumatic assemblies within ventilators is to deliver medical gases to patients in the proper volume, flow rate, pressure, and mixture. These assemblies are composed of tubing, filters, flow transducers, pressure transducers, regulators, check valves, pressure switches, and proportional solenoid valves. For ease of presentation, the two proportional solenoid valves which are mounted to a common base will be referred to as one assembly (i.e., PSOL). The role of a PSOL is to proportionally open or close its two internal valves to govern flow of air and oxygen. The position of each valve is controlled by the ventilator's microprocessor and electronics circuitry. Feedback to the microprocessor from flow and pressure transducers allows immediate fine adjustment to PSOL function. By this method, the microprocessor controls the characteristics of breath delivery based upon the clinician's settings for ventilatory therapy. The PB-PSOL operates in the following manner. When current is applied to a copper wire coil, an induced (magnetic) field acts upon an armature assembly which pulls a poppet away from its seat. The nonmagnetic poppet and seat serve as barriers to gas flow within the PB-PSOL. The greater the applied current the farther the poppet will move; resulting in higher gas flow. The "flow-versus-current" curve of a PB-PSOL displays an approximately linear function over the design range. Puritan-Bennett has used PSOLs in 7200 Series ventilators since May, 1983. This series includes models 7200 (K823858B; cleared 5/83), 7200a (K843424/A; cleared 11/84), and 7200ae (K902506B; cleared 1/90). To date, Puritan-Bennett Corporation has sold approximately twenty thousand (20,000) 7200 Series ventilators for domestic and international clinical applications. The predicate PSOL is P/N 20800. The principle distinction between P/N 20800 and the PB-PSOL is in the geometry of the armatures which move the poppets. The former uses an additional magnet to achieve relative linearity for the flow-versus-current curve. The armature geometry of the latter does not require such a magnet. Either PSOL can be installed directly into a 7200ae ventilator without software or hardware modifications. The hazard analysis for the Model 7200ae ventilator was reviewed to identify any risks associated with PSOL functions. Upon review of a Failure Mode and Effects Analysis for the PB-PSOL and the content of the above document, it was determined that use of the PB-PSOL would not raise new types of safety or effectiveness issues nor alter the likelihood of occurrence of theoretical risks. Therefore, the hazard analysis is identical for ventilators using the PB-PSOL or P/N 20800 (K902506B). 1 {2} To ensure that the PB-PSOL met all its functional requirements and that 7200ae ventilators utilizing PB-PSOLs operated per design intent, two levels of testing were performed. Component-level tests evaluated whether isolated valves performed within design specifications. System-level tests assessed interaction of the PB-PSOL with other ventilator components to assure that the software-controlled microprocessor circuitry provided breath delivery within system specifications. Fifteen PB-PSOLs were evaluated against each requirement of the Proportional Valve Specification. The acceptance criteria for all component-level tests were met. Ten of the fifteen valves were subjected to, and passed, the "life" test. These fifteen PB-PSOLs were then placed into fifteen 7200ae ventilators to conduct system-level evaluations. A total of one-hundred-thirty (130) individual ventilator performance characteristics were assessed by a test stand called the System Performance and Service Tester (SPST). Seven test sections were specific to PSOL function. The remaining tests assessed other components or the ventilator's output while under control of its microprocessor. This assured that the PB-PSOL did not negatively affect other assemblies in an unanticipated manner. The test results demonstrated that the seven system-level evaluations specific to the PSOL were successfully completed. Furthermore, all other system-level tests performed by the SPST provided evidence of ventilator performance per specification. It was concluded that the PB-PSOL is functionally equivalent to the predicate valve. In conclusion, Model 7200ae Ventilators incorporating either PSOL have the same indications for use, modes of therapy, technological characteristics, and performance specifications. Puritan-Bennett Corporation concludes that the PB-PSOL is substantially equivalent to P/N 20800. 2
Innolitics
Guidance Recalls

Panel 1

/
Ready

Predicate graph will load when search results are available.

Embedding visualization will load when search results are available.

PDF viewer will load when search results are available.

Loading panels...

Select an item from Submissions

Click any panel, subpart, regulation, product code, or device to see details here.

Section Matches

Results will appear here.

Product Code Matches

Results will appear here.

Special Control Matches

Results will appear here.

Loading collections...