In the medical industry, vacuum systems are among the many core equipment and processes “Key support”As a vacuum system, vacuum valves serve as“control center”Its performance directly affects the stability, diagnosis and treatment accuracy, and compliance of medical processes of medical equipment. Unlike the industrial sector, the medical industry has a focus on vacuum valvesAseptic and clean, precise regulation, safe and reliable, in compliance with medical certificationWaiting for special requests. This article will dissect the core application scenarios, adaptation types, and key selection of vacuum valves in the medical industry, helping medical equipment manufacturers and medical institutions achieve precise selection.

1、 Core application scenarios and adaptation types of vacuum valves in the medical industry

The vacuum demand distribution in the medical industryDiagnostic equipment, therapeutic equipment, biopharmaceutical preparation, hospital public systemsThere are significant differences in the functional, material, and precision requirements of vacuum valves in different scenarios in the four major fields, and targeted matching is needed:

1. Diagnostic medical equipment: precise pressure control to ensure detection accuracy

The vacuum system in diagnostic equipment is mainly used for “Sample separation, imaging assistance, gas control”Vacuum valves need to achieve precise and stable pressure regulation to avoid the impact of pressure fluctuations on detection results.

The vacuum system in therapeutic equipment is often used for “Negative pressure suction, minimally invasive surgery, and low-temperature treatment”Vacuum valves need to haveSecurity redundancy, rapid emergency responseAbility to achieve precise control over the treatment process.

Vacuum processes in the field of biomedicine (freeze-drying, distillation, aseptic filling) and their impact on vacuum valvesCleanliness, sealing, traceabilityVery high requirements, must meetGMPWaiting for medical industry certification standards.

The central vacuum system of the hospital provides negative pressure air source for each department, and the vacuum valve needs to haveHigh reliability and easy maintenanceThe characteristics ensure 24 Run continuously for hours without interruption.

2、 Key selection points for vacuum valves in the medical industry: four dimensions to maintain safety and compliance bottom line

The requirements for vacuum valves in the medical industry far exceed those in the industrial sector, and the selection should focus onClean and sterile, safe and reliable, precise control, and compliance certificationFour core dimensions to avoid the selection errors of conventional industrial valves:

1. Material selection: Medical grade materials are the foundation to eliminate pollution risks

lValve body materialPriority should be given to selecting medical grade316LStainless steel (low carbon, low sulfur, no impurity precipitation), oxygen free copper (low gas release rate) can be selected for high vacuum scenarios; It is strictly prohibited to use materials such as cast iron and carbon steel that are prone to rust and impurities, in order to avoid contaminating medical samples or drugs.

lSeal materialMatch according to application scenarios:

Øblood/Fluid contact scenarios: medical siliconeEPDM(No dissolved substances, good biocompatibility, can be sterilized at high temperatures);

ØDrug preparation scenario:PTFEThePFA(Compliant with)FDACertified, resistant to organic solvents, non adsorptive);

ØLow temperature scenario: Perfluoroether rubber（FFKM, enduring- 196℃Low temperature, no risk of brittle fracture.

lsurface treatment: Regarding medical samples/The inner wall in contact with drugs needs to be electropolished（Ra≤0.4μm）The outer surface needs to be passivated to prevent the precipitation of metal ions and reduce bacterial adhesion.

2. Sealing performance: extremely low leakage rate, ensuring vacuum stability and sterility

lConventional medical scenariosLeakage rate required≤10⁻⁷Pa・m³/sTo prevent external air from infiltrating and damaging the vacuum environment, or causing microbial contamination;

l高真空/Ultra high vacuum scene(such asMRIMass spectrometer: leakage rate required≤10⁻⁹Pa・m³/sEnsure the long-term stable operation of the vacuum system and reduce the maintenance burden of the vacuum pump;

lsealed structurePriority should be given to using corrugated tube seals and diaphragm seals (without packing boxes to avoid leakage caused by packing wear), and avoiding using root seals (which are prone to aging and particle impurities).

3. Functional adaptation: precise control+Security redundancy to meet the special requirements of medical scenarios

lprecise controlMinimally invasive surgery, drug freeze-drying and other scenarios require valves to be equippedProportional adjustment function(such as0-100%Adjustable opening to achieve continuous and precise control of pressure; Equipped with position feedback sensors to provide real-time feedback on valve opening, facilitating closed-loop control of the system.

lsafety redundancy：

ØThe negative pressure suction system in the operating room needs to be equipped “Dual power drive”Valve, can be manually opened for emergency in case of power failure/close;

ØValves for drug preparation pipelines need to have “anti-misoperation”Locking function to prevent medication from being scrapped due to accidental opening and closing;

ØValves for low-temperature treatment equipment need to be installed “overtemperature/Overpressure alarm”Automatically cut off the pipeline in case of abnormalities.

lCleaning and sterilization adaptationValves in biopharmaceutical scenarios need to supportOnline cleaning（CIP）And online sterilization（SIP）The valve body design has no dead corners or dents, making it easy to clean with cleaning agents/Sterilization steam circulation; The valve of minimally invasive surgical instruments should be able to withstand ethylene oxide sterilization orγRadiation sterilization, with no degradation in performance after sterilization.

4. Compliance certification: Medical grade certification is the entry threshold, and it is indispensable

Vacuum valves in the medical industry must have corresponding medical certifications, otherwise they cannot be used in medical scenarios

lDomestic certificationMedical Device Registration Certificate (for valves that come into direct contact with the human body)GMPCertification (for drug preparation scenarios)ISO 13485Medical device quality management system certification;

lInternational Certification：FDACertification (US market)CECertification (for the EU market, compliance is required)MDRRegulations)USP Class VIBiocompatibility certification (with human body)/Components that come into contact with drugs.

3、 Typical application case: The practical value of vacuum valves in medical settings

1. case1Transformation of Vacuum Valve for Freeze Drying Machine in a Biopharmaceutical Factory

lOriginal questionThe original industrial grade vacuum ball valve was used, with a valve body of 304 Stainless steel and ordinary nitrile rubber seals have the following issues:①High roughness of the inner wall, prone to residual drug powder, and insufficient cleaning;②The seal is not durableSIPSterilization,3 Aging and leakage within a month;③No opening feedback, freeze-drying pressure fluctuation±5%Resulting in poor uniformity of drug freeze-drying.

lRenovation Plan: Replace withSanitary grade316LStainless steel vacuum diaphragm valveThe sealing component isFDAcertificationPTFEEquipped with proportional adjustment and position feedback functions, supportingCIP/SIPSterilization.

lrenovation effect：①The pressure fluctuation of drug freeze-drying has decreased to±0.5%Improved uniformity of freeze-drying15%；②The lifespan of the seal has been extended to18 Months, annual maintenance costs reduced60%；③comply withGMPCertified and successfully passed the drug production qualification review.

2. case2Upgrade of negative pressure suction system in a tertiary hospital center

lOriginal questionThe original valve was a cast iron globe valve with a high leakage rate, resulting in unstable negative pressure (fluctuation) ±0.02MPa）Frequent occurrence of suction weakness during surgery; And the valve body is rusted, which poses a risk of impurities entering the patient's body.

lupgrade plan: Replace withmedical grade316LStainless steel pneumatic vacuum solenoid valveEquipped with dual power drive and fault alarm function, sealed with medical grade componentsEPDMsupport134℃High temperature sterilization.

lUpgrade Effect：①Negative pressure fluctuation control±0.005MPaInternally, surgical attraction efficiency is improved20%；②The valve is free from rust and impurities, eliminating the risk of medical infection;③Automatic fault alarm, shortened operation and maintenance response time to10 Min, ensure the negative pressure system of the entire hospital24 Stable operation for hours.

4、 Operation and maintenance of vacuum valves in the medical industry: extending their lifespan and ensuring compliance

The operation and maintenance of vacuum valves in the medical industry need to be taken into accountPerformance stabilityandMedical complianceTo avoid contamination or certification failure caused by improper maintenance:

1.Regular cleaning and sterilization:

lWith the human body/Valves in contact with the sample (such as surgical suction tubing valves): High temperature steam sterilization is performed weekly（134℃/30min）；

lDrug preparation pipeline valves: carried out after each batch of productionCIPCleaning, conducted monthlySIPSterilization and cleaning/Sterilization records need to be retained (meeting the requirements)GMPTraceability requirements).

2.Seal replacementRegularly replace seals according to usage frequency (recommended for medical silicone seals)6-12Replace every month,PTFESuggestions for sealing components12-18After replacement, a leakage rate test is required to ensure that the sealing performance meets the standard.

3.Calibration and testingCalibration of valve opening accuracy and leakage rate shall be conducted annually, and the calibration report shall be issued by an institution with medical equipment calibration qualifications to ensure compliance with medical equipment measurement requirements.

4.Spare Parts ManagementKey medical equipment (such asMRIThe freeze-drying machine needs to reserve spare valves of the same model, and the spare valves need to be sterilized in advance/Cleaning treatment ensures quick replacement in case of malfunction and reduces equipment downtime.

Conclusion

The application of vacuum valves in the medical industry is “technical performance”and“Medical characteristics”Deep Fusion——It is necessary to meet the precise pressure control and stable sealing requirements of the vacuum system, as well as the sterile, compliant, and safe standards in the medical field. When selecting, it is necessary to break away from the inherent thinking of industrial valves and accurately match medical scenarios from the four dimensions of material, sealing, function, and certification. At the same time, proper operation and maintenance should be carried out to truly play the core role of vacuum valves in medical diagnosis, treatment, and drug preparation, and to build a solid foundation for medical safety and diagnosis and treatment quality“Vacuum defense line”.

Hangzhou Yushi Technology Co., LtdFocusing on providing technical services and solutions related to flow, pressure, vacuum detection and control for industrial and scientific research customers, the company acts as an agent and distributor in the United StatesALICAT、 Swiss Vogtlin, American MKS, Japanese EBARA and other brands, combined with their agent products, provide customers with high-quality flow and pressure monitoring solutions, aiming to improve customers' research and production efficiency, improve their manufacturing processes, and promote their scientific research and innovation progress.