Molded Injection/Compression Seals In Medical Applications

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Molded Injection/Compression Seals In Medical Applications

Engineered elastomeric shapes are common components in devices used in many industries. In the medical field, they are often used for parts such as disposable seals, medical device bladders, medical device diaphragms, and various subassemblies.

Medical Device Bladder Seals Ensure Accuracy

Blood pressure bladders or cuffs monitor blood pressure by converting expansions and contractions on the surface of the arm caused by the brachial artery, capillary, and venous return system to proportional dynamic pressure changes in the latter of the cup assembly. The change produces an oscilleometric wave, a low-frequency acoustical signal waveform, that passes from the bladder assembly through a hose to a monitor. To make sure that what the monitor measured was an accurate reflection of blood pressure, the assembly used seals between the bladder and the hose. The same principle is used in both single and dual hose cuffs, which are often used on overweight patients with larger arms.

Diaphragm Valves Depend On Properly Engineered Seals

Diaphragm valves, also called membrane valves, are widely used in the bio-pharmaceutical industry as shut off valves for automatic dispensing systems and other equipment. A typical design uses a valve body with two or more ports, a diaphragm, and a seat or saddle where the diaphragm closes the valve. Made of plastic or metal, these valves can be manual or automated, wherein they are controlled by actuators that use air pressure applied to a pilot valve that helps the actuator raise the diaphragm and open the valve. The diaphragms themselves are often made of NR/Natural Rubber, NBR/Nitrile/Buna-N, EPDM, FKM/Viton, or SI/Silicone Rubber.

Seals Crucial To Disposable Medical Products

Modern medical practice makes extensive use of disposable products, which often incorporates molded injection/ compression seals in their design and manufacture. Some of these products might include trocars, used in laparoscopic surgery to insert instruments into the body and in embalming and veterinary medicine to drain fluids or introduce them into the body. The devices have a housing assembly and a piercing stylus inserted into the body. Within the assembly, there are a series of O-rings, quad rings, and advanced seal assemblies, such as duckbill seals.This stays closed until a surgical instrument is inserted on the other end.

To do the job, the seals must meet high performance standards; even if they are disposable, they must accommodate multiple instrument insertions and removals. The materials used must be biocompatible with other materials and capable of reducing seal friction. Most often, the seals are made of silicone (VMQ) or silicone elastomers such as styrene butadiene (SBR) or polyisoprene (IR). Just as important as the material is the exacting design, which must be tested extensively to produce documented evidence that they will withstand usage in the operating room. Seals may be the most important component of a trocar.

Medical Seals That Meet Your Standards

If you use medical seals, you know the importance of having properly engineered product. Engineered seals from Performance Seal meet stringent development and testing protocols. Whatever characteristics you need in your molded compression seals, Performance Seal offers the right Parker product for you. Click here for a catalog or contact us at 800-277-9658.

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