Hemostatic Clip Material Design for Reusable Ligation
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Solution Overview
Problem
Hemostatic clips used in body cavities often experience a reduction in opening width after repeated use, making it difficult to reliably ligate bleeding spots due to plastic deformation, which narrows the clip's opening and reduces its effectiveness.
Innovation Solution
A hemostatic clip design utilizing a first member made of a metallic material with a wider elastic deformation range than stainless steel and second members with higher rigidity, connected by metallic bonding, maintains the clip's opening width by preventing plastic deformation of the enlarged sections during repeated use, allowing for easy re-pinching and strong ligation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the clip is retracted into the fixing member during pinching, then the clip can be reused for re-pinching, but plastic deformation occurs in the closing direction causing the opening width to narrow
Solution Approach 1:
The patent changes the material parameter of the clip body from conventional stainless steel to a metallic material with a wider elastic deformation range. This parameter change allows the clip to undergo larger elastic deformations during retraction and expansion without plastic deformation, thereby maintaining the opening width and enabling repeated use for re-pinching
Solution Approach 2:
The patent employs a composite structure where the clip body is made of a metallic material with wider elastic deformation range while the holding tube and other components may use different materials. This composite approach optimizes the elastic properties of the clip body to prevent permanent deformation and maintain opening width across multiple uses
2Ease of operation
If the opening width of the clip is maintained through material selection, then re-pinching becomes easy, but the ligation force may be reduced
Solution Approach 1:
The patent applies local quality by having different material properties in different parts of the clip system. The clip body uses a metallic material with wider elastic deformation range for ease of operation and repeated use, while the enlarged sections and connection portions are designed with specific geometric features to concentrate and transmit ligation force effectively to the tissue
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
The clip enables easy re-pinching and reliable ligation of bleeding spots with a strong force, maintaining the initial opening width even after multiple uses, thus addressing the issue of reduced effectiveness due to plastic deformation.
Implementation Method 1
a belt-like member which is folded at an intermediate section in the longitudinal direction. The clip body includes a first member and a pair of second members. The first member is formed of a metallic material having a wider elastic deformation range than that of stainless steel
Implementation Method 2
The first member (11) and the second members (21) are connected to each other by metallic bonding
Data Source
Figure 1~2
Figure 3A~3C
Figure 4~5
AI summary
A hemostatic clip includes: a clip body formed by folding an intermediate section of a belt-like member; and a holding tube. The clip body includes: a first member formed of a first metallic material that is elastically deformable; and a pair of second members that are formed of a second metallic material having a lower elastic strain limit than an elastic strain limit of the first metallic member and are connected to respective both ends of the first member. The holding tube is configured to change an opening width of the clip body by holding part of the clip body in the holding tube.