Morphological Classification Of The Distal End Of The Hypotube

The distal shape of the hypotube can be basically divided into three categories: wire-lined, stepped and cut.

The lining wire type has no smooth transition. The bending resistance and flexibility of the lining wire from the proximal end to the distal end vary greatly and suddenly. At the same time, because the lining wire is soft, it can support the distal shaft of the balloon dilatation catheter. Also poor.

The stepped hypotube is limited by the diameter of the tube body and the length of the stepped part, and the transition section is usually short, which cannot achieve a slow gradient of the compliance performance and cannot support the rod body at the farther end of the guide wire port, which limits the sea level. Pushing force transfer performance of the wave tube. Moreover, the stepped hypotube occupies a large proportion of the lumen of the distal rod of the balloon dilatation catheter at the guide wire port, which easily affects the filling and withdrawal time of the balloon dilation catheter (the balloon needs to be expanded during the interventional operation). Contrast fluid is injected into the distal shaft lumen of the catheter to inflate the balloon).

The cutting type improves the flexibility of the tube body in the radial direction without affecting the transmission of the axial force by cutting the hypotube body with different texture designs. In order to realize the cooperating with the distal shaft of the balloon dilatation catheter, the cutting type hypotube needs to be used in combination with the stepped type, because the cutting process can only be performed on the complete tube body. Compared with the stepped type, the cut-type hypotube has a smooth transition from proximal to distal in terms of bending resistance and compliance, but also does not transmit the pushing force well to the shaft further distal than the guide wire port. , there will also be a problem that a large proportion of the lumen of the distal rod of the balloon dilation catheter is occupied at the guide wire port, which easily affects the filling and withdrawal time of the balloon dilation catheter.

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