Tapered Hemostatic Forceps Clamp Pieces
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Solution Overview
Problem
Conventional hemostatic forceps for endoscopes struggle to effectively clamp and cauterize small or wide-area tissues, particularly in digestive organs, due to their tubular shape and limited contact area, leading to inadequate bleeding control and potential tissue damage.
Innovation Solution
The design of hemostatic forceps with rotatable, tapered clamp pieces that decrease in width towards the distal end, featuring concave portions and grooves, allows for stable clamping and cauterization of tissues, with adjustable opening widths and angles to accommodate varying tissue sizes, and parallel-facing clamp faces to ensure uniform pressure and minimize slipping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional tubular-shaped hemostatic forceps are used, then the structure is simple, but the contact area with tissue is limited and clamping stability is insufficient
Solution Approach 1:
The clamp pieces are divided into multiple sections with different width characteristics (narrow distal portion for small vessels, wide bottom portion for large vessels), allowing each section to serve a specific clamping function and improving overall clamping stability for various tissue sizes
Solution Approach 2:
The clamp pieces transition from a simple tubular shape to a tapered three-dimensional form with varying width along the length, adding dimensional complexity that enables stable contact with tissues of different sizes and shapes
2Manufacturing precision
If the clamp pieces have a uniform width, then the structure is simple, but the cauterization width varies when clamping tissues of different sizes
Solution Approach 1:
Different sections of the clamp pieces have different width characteristics - the distal portion is narrow for precise cauterization of small vessels, while the bottom portion is wide for cauterization of large vessels, ensuring consistent cauterization width matched to tissue size
Solution Approach 2:
The width parameter of the clamp pieces is changed along the length from distal to bottom, creating a tapered shape that allows the same clamp piece to achieve consistent cauterization results across tissues of varying sizes
3Force
If the clamp pieces are closed completely, then the clamping force is maximum, but the tissue may slip due to manufacturing errors or uneven contact
Solution Approach 1:
A gap is intentionally left between the clamp pieces to prevent complete closure, which compensates for manufacturing errors and uneven tissue contact, preventing tissue slip while maintaining sufficient clamping force through the high-frequency current
4Reliability
If the distal parts of clamp pieces are wide, then the contact area with tissue is large, but the view area of endoscope is blocked
Solution Approach 1:
The clamp pieces are segmented into a narrow distal portion for minimal endoscope view area blockage and a wide bottom portion for stable tissue contact, allowing the narrow distal portion to pass through tissue with minimal obstruction to the endoscope view while the wide bottom portion provides sufficient contact area for reliable clamping
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
This design enables firm clamping and uniform cauterization of tissues, including small blood vessels and spreading mucous membranes, while minimizing the endoscope's view area and preventing tissue damage, thereby effectively controlling bleeding across diverse tissue sizes and shapes.
Implementation Method 1
a hemostatic forceps for an endoscope which cauterizes and clots blood by applying high-frequency current to a clamped blood vessel
Data Source
AI summary
A hemostatic forceps for an endoscope has a support section for supporting the pair of clamp pieces and so that they can rotate and change their distal parts direction. The pair of clamp pieces and are formed in tapered shape so that widths of the pair of clamp pieces gradually decrease in a direction from a side of the support section to a side of the distal parts. Length of the pair of clamp pieces at arbitrary location along the direction from a side of the support section to the distal sides, times the width of the pair of clamp pieces at the same location, is set to be substantially constant.