A method for forming the tip of an all-silicone hemodialysis catheter

Abstract

The invention provides a point molding method for a full silica gel hemodialysis catheter. The point molding method comprises the following steps that firstly, the silica gel catheter is placed in an airtight container provided with a placement valve allowing liquid nitrogen to be placed, a release valve for releasing the liquid nitrogen and a turnover door allowing entering and going-out of the silicone rubber catheter; secondly, the liquid nitrogen is poured into the airtight container to enable the liquid nitrogen to immerse the silica gel catheter, soaking is conducted for at least one minute, and the silica gel catheter is hardened through cooling of the liquid nitrogen; and thirdly, the liquid nitrogen in the airtight container is quickly released, then the hardened silica gel catheter is taken out from the airtight container, and the hardened silica gel catheter is immediately machined into a silica gel catheter with a point through a chamfering machine. Using the low-temperature freezing effect of the liquid nitrogen, the temperature of a silica gel material reaches -100 DEG C, the silica gel material is hardened, then the hardened silica gel catheter is quickly taken out to be machined , the machined appearance and size are greatly improved, namely, the machining surface is further relatively smooth, and the size is stable.

Description

technical field [0001] The invention relates to a method for forming the tip of an all-silicone hemodialysis catheter. Background technique [0002] Silicone rubber medical catheter has good tensile properties, and the tube body, especially the thinner tube body, is soft, bendable and elastic. These characteristics make the silicone rubber catheter bend and deform during insertion. Mainly used catheters include urinary catheters, drainage tubes, double-lumen manometry tubes, hemodialysis tubes, etc. However, when making some tapered silicone products, such as catheters for hemodialysis, it needs to be made into a cone at the front end of the catheter to make it easier to insert the catheter into the human body. However, due to the characteristics of silicone rubber, it is soft, insoluble, and insoluble. The characteristics of melting, "insoluble" means that the solvent cannot disperse it at the molecular level without destroying its chemical structure; Formed silicone tub...

AI Technical Summary

Problems solved by technology

However, when making some tapered silicone products, such as catheters for hemodialysis, it needs to be made into a cone at the front end of the catheter to make it easier to insert the catheter into the human body. However, due to the characteristics of silicone rubber, it is soft, insoluble, and insoluble. The characteristics of melting, "insoluble" means that the solvent cannot disperse it at the molecular level without destroying its chemical structure; Formed silicone tubes encounter great difficulties in the production and processing of such conical products or other products, because the silicone tube is soft, and even if ordinary mechanical processing methods are used, the processed surface is rough or the size is unstable.

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