Biopsy Forceps Cup Geometry for Puncture-Hole Insertability
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Solution Overview
Problem
Conventional biopsy forceps have issues with either poor insertability into puncture holes or insufficient tissue collection capacity, limiting the effectiveness of endobronchial ultrasound-guided transbronchial needle aspiration (EBUS-TBNA) for lung cancer diagnosis.
Innovation Solution
A biopsy forceps design with a larger cup capacity and improved insertability, featuring a sheath, operation wire, and forceps pieces that can open and close to collect tissue efficiently, integrated into an endoscopic treatment system for bronchial use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a biopsy forceps with larger cup capacity is used to collect sufficient tissue, then the tissue collection amount is improved, but the insertability into the puncture hole deteriorates
Solution Approach 1:
The biopsy forceps is divided into multiple segments: a sheath for protection and insertion, an operation wire for actuation, and forceps pieces for tissue collection. This segmentation allows the forceps to be inserted in a compact state while maintaining adequate collection capacity when opened.
Solution Approach 2:
The forceps pieces are designed to be dynamically openable and closeable through the operation wire mechanism. This dynamic structure enables the forceps to transition from a compact inserted state to an expanded tissue collection state, resolving the contradiction between insertability and collection capacity.
2Measurement precision
If conventional needle aspiration biopsy is used, then the diagnostic accuracy is improved, but the sample quantity and quality deteriorate due to blood mixing and insufficient tissue collection
Solution Approach 1:
The invention extracts the tissue collection function from the aspiration needle and implements it through a dedicated forceps mechanism. This separation allows for selective tissue grasping without blood contamination, improving both sample quality and quantity while maintaining diagnostic accuracy.
Solution Approach 2:
The forceps act as an intermediary tool between the puncture needle and the tissue sample. After the needle creates the puncture path, the forceps are inserted through the same path to collect tissue mechanically, avoiding blood contamination while ensuring adequate sample collection for accurate diagnosis.
Data Source
AI summary
The present disclosure is a biopsy forceps that is insertable into a puncture hole formed by puncturing biological tissue with a needle, including a first forceps piece having a length in one direction and a forceps cup having a recess in which the biological tissue is collectable, and a second forceps piece disposed on an opening side of the recess of the first forceps piece, wherein the first forceps piece is openable and closeable toward a distal end side in a longitudinal direction with respect to the second forceps piece, the forceps cup has a body portion and a distal end portion provided on a distal end side of the body portion in the longitudinal direction, and a length of the distal end portion in a direction perpendicular to the longitudinal direction becomes smaller toward the distal end side.