Surgical Valve Fixation With Hooked Expandable Stents

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Solution Overview

Problem

Surgical valves require complex sewing processes during implantation, leading to increased surgical risks and longer operation times.

Innovation Solution

A surgical valve with an expandable stent and an implantation device featuring a fixing member and expanding structure, allowing for secure fixation without sewing by using insertion hooks and radial expansion to support the valve on the native valve annulus.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If surgical valve is sewed to native valve annulus using traditional surgical procedure, then valve can be fixed securely, but surgery time is long and surgical risk is increased

Engineering Contradiction:

Improvesecure fixation of valveVSAvoidsurgery time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The stent is divided into multiple segments or cells that can be independently expanded. Each segment contains insertion hooks that can engage with the native valve annulus separately, allowing for distributed fixation throughout the implantation process rather than requiring complete sewing of the entire valve

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The stent transitions from a compressed delivery state to an expanded fixed state through radial expansion. This dynamic transformation allows the stent to be delivered in a compact form through catheters and then expand to its functional configuration with insertion hooks engaged in the native annulus, eliminating the need for traditional sewing procedures

Inventive Principle:

Principle #15Dynamics

2Reliability

If surgical valve is sewed to native valve annulus, then valve is fixed, but complexity of surgical procedure increases

Engineering Contradiction:

Improvefixation stabilityVSAvoidsurgical procedure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The insertion hooks are extracted as separate functional elements from the traditional sewing apparatus. These hooks are integrated into the stent structure itself, allowing fixation to be achieved through the stent's expansion and hook engagement rather than through separate sewing operations

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The stent performs its own fixation function through its expanded structure and integrated insertion hooks. The stent self-anchors to the native valve annulus through radial expansion and hook engagement, eliminating the need for external sewing instruments and procedures

Inventive Principle:

Principle #25Self-service

3Reliability

If traditional sewing method is used to fix surgical valve, then valve can be implanted, but risk of valve damage and failure increases

Engineering Contradiction:

Improvevalve implantation successVSAvoidrisk of valve damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The stent provides a protective framework that cushions and protects the valve leaflets during implantation and operation. The stent structure absorbs mechanical stresses and prevents direct transmission of forces to the valve tissue, reducing the risk of damage

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The stent acts as an intermediary structure between the surgical valve and the native valve annulus. It provides a stable attachment platform that distributes fixation forces uniformly, preventing concentrated stresses that could damage the valve or surrounding tissue

Inventive Principle:

Principle #24Intermediary (Mediator)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Simplifies surgical procedures, reduces the risk of valve damage and failure, and shortens surgery time by ensuring a secure and stable fixation of the surgical valve.

Implementation Method 1

Another end of the expandable stent is configured to be radially expanded so as to be supported on one side of the native valve annulus

Methodology Applied

Scientific EffectRadial expansion:

Implementation Method 2

The expandable stent is provided with a plurality of insertion hooks configured to be inserted into a native valve annulus

Methodology Applied

Scientific EffectMechanical insertion: Mechanical Fastener

Data Source

PatentUS12453629B2Surgical valve and implantation device therefor

Publication Date: 2025.10.28 SHANGHAI CINGULAR BIOTECH

AI summary

Provided are a surgical valve and an implantation device therefor. The surgical valve includes a valve body and an expandable stent. The valve body includes a valve base and a valve frame disposed on the valve base. The expandable stent is of a cylindrical structure with openings at a first end and a second end of the expandable stent. The first end of the expandable stent is sleeved on the valve body, and a plurality of insertion hooks configured to be inserted into a native valve annulus are disposed along a periphery of the first end of the expandable stent. The second end of the expandable stent is configured to expand radially to be supported on one side of the native valve annulus.