Endoluminal Device Composite Yarn Stent Recoil
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Solution Overview
Problem
Current stents face challenges with recoil risk and insufficient long-term patency rate, as well as difficulties in attachment to delivery instruments, which affect the efficacy of stenosis treatment and prevention of restenosis.
Innovation Solution
The development of an endoluminal device comprising composite yarns made of biodegradable polymer yarns and alloy wires, where the polymer yarns provide long-term support and the alloy wires enhance mechanical stability and attachment to delivery instruments, minimizing recoil and ensuring a longer patency rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If biodegradable polymeric stents are used, then long-term patency rate is improved, but recoil risk increases
Solution Approach 1:
The patent applies composite materials by combining biodegradable polymer yarns with biocompatible metal wires (such as platinum, iridium, or tungsten) to create a hybrid stent structure. The metal wires provide the necessary mechanical strength and recoil resistance, while the polymer yarns ensure long-term patency through controlled biodegradation. This composite approach resolves the contradiction by integrating the advantages of both materials: the structural integrity of metals and the biocompatibility of polymers.
2Duration of action of stationary object
If biodegradable polymeric stents are used, then long-term support is provided, but attachment to delivery catheter is insufficient
Solution Approach 1:
The hybrid composite structure combines biodegradable polymer yarns with biocompatible metal wires, where the metal components provide sufficient mechanical strength and surface properties for reliable attachment to the delivery catheter. The polymer yarns maintain long-term support through controlled degradation. This composite approach resolves the contradiction by allowing the metal wires to handle delivery-related mechanical demands while the polymer ensures prolonged structural support.
3Reliability
If permanent stents are used, then long-term patency is maintained, but restenosis due to smooth muscle cell proliferation occurs
Solution Approach 1:
The patent employs biodegradable polymer yarns that gradually degrade and are absorbed by the body over time. During this degradation process, the stent transitions from a permanent structure to a temporary one, eventually being completely resorbed. This discarding mechanism prevents long-term foreign body presence that triggers smooth muscle cell proliferation and restenosis, while the controlled degradation timeline ensures adequate structural support is maintained throughout the critical healing period.
4Strength
If temporary stents are used, then recoil risk is reduced, but long-term patency rate decreases
Solution Approach 1:
The patent utilizes parameters changes by controlling the degradation rate of the biodegradable polymer yarns to match the physiological healing timeline. The stent maintains its mechanical properties and recoil resistance during the initial critical period, then gradually transitions as the polymer degrades. This time-dependent parameter change allows the stent to function as temporary during implantation and as permanent for long-term support, resolving the contradiction between temporary and permanent characteristics.
Data Source
AI summary
An endoluminal device includes a composite yarn with a polymer yarn and an alloy wire. The polymer yarn includes a biodegradable polymer, and the alloy wire includes a biocompatible alloy. An endoluminal device can include a plurality of polymer yarns and at least one alloy wire, in which the polymer yarns include a biodegradable polymer, and the least one alloy wire includes a biocompatible alloy. A surgical system or kit includes an endoluminal device and a delivery instrument.