Hand-sewn valved outer pipe and mold and sewing method for the pipe

Abstract

The invention discloses a hand-sewn outer pipeline with petals, a mold for sewing and a sewing method. The hand-sewn outer pipeline specifically comprises an outer pipe body and PTFE (Poly Tetra Fluoro Ethylene) petals, wherein the PTFE consists of three U-shaped units; each U-shaped unit comprises a petal part and a connecting part, and is formed by direct drawing and cutting through a petal manufacturing mold, and the edge of each U-shaped unit is sewn on the inner wall of the outer pipe body; the petal part of each U-shaped unit extends towards the direction of a central axis of the outer pipe body, and the edge parts of the plurality of petal parts are mutually and freely overlapped; prefixation lines for sewing equal diversion points of the U-shaped units and the outer pipe body are arranged at the 5-0 prolene line position from left to right and the 5-0 prolene line position from right to left in the whole U shape. The outer pipeline disclosed by the invention is used for treating complex complications such as congenital heart malformation and pulmonary regurgitation of children; by animal experiment and clinical application, the outer pipeline has the characteristics of high stability, strong durability and good anti-regurgitation effect; the dilemma of lack of the outer pipeline with the petals is solved and the decaying rate is lower.

Description

technical field [0001] The invention relates to the technical field, in particular to hand-sewn external pipelines with flaps. Background technique [0002] Expanded polytetrafluoroethylene (ePTFE) is a porous medical polymer material with extremely stable physical and chemical properties made by a special process. It has an extremely inert surface and high chemical stability. 【1】 , The 0.1mm ePTFE sheet is very thin, with good softness and mobility, all of which make it possible for the 0.1mm ePTFE sheet to become a new type of artificial valve material. [0003] In 1993, Yamagishi 【2】 For the first time, a 0.1mm polytetrafluoroethylene (PTFE) sheet was used to make a single pulmonary valve, which was applied to the right ventricular outflow tract of tetralogy of Fallot, and achieved a good anti-reflux effect. Subsequently, Turrentine MW 【3】 and BrownJW 【4】 It has been reported that the 0.1mmPTFE single flap has good mobility, and no thrombus and calcification were found...

AI Technical Summary

Problems solved by technology

In 2008, Nunn GR 【5】 Introduced that the durability of PTFE double valve against reflux is better than that of single valve, and the calcification and thickening of valve leaflets were not seen in the follow-up.

The cause is not known, but a hypersensitivity of the child's immune response is thought to be a possible factor 【20】

Moreover, for children, the high failure rate of extravasated ducts means that repeated operations are required, which greatly increases the suffering of children and the financial burden of the entire family.

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