Coaxial Biopsy Instrument With Ratchet Control for One-Handed Sampling
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Solution Overview
Problem
Existing biopsy instruments are large and cumbersome, making them difficult to use and prone to improper handling, which can lead to faulty operations.
Innovation Solution
A handheld biopsy instrument with a coaxially arranged first and second part, featuring a ratchet and pawl mechanism for controlled axial movement, allowing single-handed operation and under-pressure creation, along with rotational stops to facilitate precise tissue sampling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If biopsy instruments are made large and electrically driven, then cutting power and tissue sampling capability are improved, but device portability and ease of operation deteriorate
Solution Approach 1:
The biopsy instrument is divided into three coaxially arranged parts: a first part with cutting tube, a second part with penetration rod, and a third part with knife. This segmentation allows each component to perform its specific function independently while maintaining overall compactness and handholdability.
Solution Approach 2:
The instrument incorporates dynamic movement capabilities where the first part can move axially relative to the second part, and the third part can rotate in the extended position. This dynamic design enables controlled tissue sampling without requiring large electric motors, maintaining portability while achieving effective cutting.
2Productivity
If biopsy instruments are made voluminous, then tissue sampling capability is improved, but device portability and single-handed operation deteriorate
Solution Approach 1:
The three parts of the biopsy instrument are coaxially arranged with the third part containing the knife nested within the second part containing the penetration rod, which is itself nested within the first part containing the cutting tube. This nested configuration maximizes functional capability while minimizing overall device volume for single-handed operation.
3Adaptability or versatility
If rotational movement is allowed during axial movement, then operational flexibility is improved, but control precision and prevention of faulty use deteriorate
Solution Approach 1:
The instrument provides conditional rotational freedom: the third part is rotationally movable only when in the extended position, while axial movement is controlled through ratchet-pawl mechanisms. This dynamic constraint system allows flexibility when needed while preventing faulty use during critical phases.
Solution Approach 2:
The rotational and axial movement parameters are changed based on the extended/retracted state of the third part. When retracted, rotation is prevented for precision control; when extended, rotation is allowed for operational flexibility. This parameter-based control ensures reliability while maintaining versatility.
Data Source
AI summary
A biopsy instrument comprising:a first part comprising a cutting tube having a distal cutting edge,a second part comprising a penetration rod,a third part comprising a knife arranged centrally along a length of the biopsy instrument, having a radially extending portion at its distal end,the first and second parts are coaxially arranged around the third part,the first part is movable axially relative the second part between a retracted position to an extended position,the third part is axially movable, the third part being rotationally movable in at least the extended position, a stop inhibits a rotational movement of the second part in relation to the first part or inhibits rotational movement, wherein the first part (1) is provided with a ratchet (30) lengthwise along a part of its length cooperating with a pawl (31) arranged in the second part (2), or vice versa.