Shaping process of medical diameter-changed cannula and cannula

Abstract

The invention discloses a shaping process of a medical diameter-changed cannula. The shaping process comprises the steps of performing diameter expansion treatment on the end of a cannula body, enabling the diameter-changed end of a diameter-changed joint and the end after diameter expansion treatment, of the cannula body to be in interference fit to form an interference connecting part, sleevingthe interference connecting part with a heat shrink sleeve pipe, and heating the heat shrink sleeve outside the interference connecting part, so that the heat shrink sleeve is subjected to thermal shrinkage and cladding to the interference connecting part, and the diameter-changed joint of the interference connecting part and the cannula body are welded. The invention further provides the cannula.The diameter-changed joint and the cannula body which are in interference fit are welded, so that the diameter-changed joint and the cannula body are integrally connected, gaps are not generated, glue is avoided, arterial and venous cannulas cannot break blood after being used for a long time, and the pressure reduction level of the cannula can be guaranteed.

Description

technical field [0001] The invention relates to the technical field of arteriovenous cannula, in particular to a molding process of a medical variable-diameter cannula and the cannula. Background technique [0002] Arteriovenous cannula (including arterial cannula, venous cannula, femoral arteriovenous cannula and long-acting ECMO femoral arteriovenous cannula, etc.) is a widely used medical device during surgery. refer to figure 1 , figure 1 It is a schematic diagram of the structure of the cannula main body and the reducing joint. The arteriovenous cannula includes a cannula main body 1 and a reduced-diameter joint 2, wherein the reduced-diameter joint 2 has a reduced-diameter end 21, and the reduced-diameter end 21 is adapted to the cannula main body 1. When connecting, the end of the cannula main body 1 needs to be The part is inserted into the reducing end 21 of the reducing joint 2 for connection. In order to ensure the connection effect between the end of the cann...

AI Technical Summary

Problems solved by technology

[0004] First, the end of the cannula main body 1 cannot completely fit the step structure inside the variable diameter end 21, which will inevitably form a gap, and the blood passes through Blood flow eddies form in the gap, or the gap traps blood and eventually forms a thrombus

[0005]Second, because the arteriovenous cannula is used on the human body, it needs to be in contact with blood for a long time, which requires very high biocompatibility of the glue, for example, Femoral arteriovenous cannulation sometimes requires 30 days of blood circulation, which is a very big challenge for glue

[0006] Therefore, the arteriovenous cannula in the prior art is easy to form thrombus and cause damage to the blood during application, and seriously affects the pressure drop level of the cannula

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