An experimental device for real-time monitoring of the radial support force of vascular stents in a simulated environment

Abstract

The invention discloses an experimental device for monitoring the radial support force of an intravascular stent in a simulated blood vessel in real-time. The experimental device comprises a variable-speed peristaltic pump (1), a liquid storage tank (2), a water bath box (3), an average stent radial support force monitoring device (4) and silicone hoses (5) connected among all parts. The average stent radial support force monitoring device (4) includes an intravascular stent(6), an inner-layer polymer transparent elastic tube (7), a resistance strain filament type sensor (8), an outer-layer polymer transparent elastic tube (9), a polymer transparent rigid tube (10), a fixation sleeve (11), a data collector (12) and a computer (13). The experimental device is capable of monitoring a radialsupport force applied to a simulated blood vessel by an intravascular stent in a flowing corrosive medium in vitro in real time and is capable of measuring average radial support forces of intravascular stents that are made different materials and have different structures. The experimental device has advantages of simple structure, low cost and great convenience to operate.

Description

technical field [0001] The invention relates to an experimental device for real-time monitoring of the radial support force of a vascular stent in a simulated environment, belonging to the field of mechanical performance testing of medical instruments. 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 the medical effect of the vascular stent cannot be exerted. Cause local vascular wall damage (such as perforation, tearing, rupture, etc.), causing excessive repair response of surrounding tissues, resulting in intimal hyperpla...

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 radial force of the stent in the blood vessel. While obtaining the radial compression force of the stent on the stent, the chronic outstretching force of the stent on the blood vessel can also be obtained at the same time; The anti-hydraulic test 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

Images