An experimental device for real-time monitoring of the support force distribution of vascular stents in a flow field environment

Abstract

The invention discloses an experimental device for monitoring support force distribution of a vascular stent in a flow field environment in real time. The device comprises a speed-adjustable peristaltic pump (1), a liquid storage tank (2), a water bath box (3), a stent support force real-time monitoring device (4), silica gel flexible pipes (5) and pipe connectors (6), wherein the stent support force real-time monitoring device (4) comprises a vascular stent (7), a polymer transparent elastic tube (8), a piezoresistive thin-film pressure sensor (9), a polymer transparent rigid tube (10), a fixing sleeve (11), a data collector (12), a computer (13) and a container (14). The experimental device is simple in structure, low in cost and convenient to operate, can measure the radial support force of vascular stents with different materials and structures, and provides a scientific theoretical basis for establishing and perfecting a detection and evaluation system for radial mechanical properties of vascular stents.

Description

technical field [0001] The invention relates to an experimental device for real-time monitoring of the distribution of support force of a vascular stent in a flow field environment, belonging to the field of mechanical performance testing of medical devices. Background technique [0002] The radial mechanical properties of vascular stents are mainly reflected in the resistance of vascular stents to external pressure and the strain capacity of vascular stents to external forces. This characteristic determines whether the vascular stent can be tightly attached to the vessel wall. If the supporting force is too small, the lumen of the vascular stent will become smaller under the reaction force of the blood vessel, which will easily cause vascular embolism, and at the same time, the vascular stent will be easily displaced under the action of blood flow; while the supporting force is too large, it will cause local vessel wall damage (such as perforation). , tearing, rupture, etc....

AI Technical Summary

Problems solved by technology

The accuracy of the anti-parallel plate extrusion performance test and the anti-V-groove extrusion performance test is relatively high, but the stress mode of the stent is different from the actual action mode in the vascular environment, so it can only be an indirect reflection of the radial strength of the stent ; The radial extrusion performance test simulates the actual situation of the stent in the blood vessel. While obtaining the radial compression force of the blood vessel on the stent, it can also obtain the chronic outstretching force of the stent on the blood vessel at the same time; the radial anti-hydraulic test It can also better simulate the stress shape of the stent in the blood vessel, but the accuracy is low and there are many uncertain factors

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