Deformable Biopsy Needle Locking Mechanism

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Solution Overview

Problem

Existing transcutaneous biopsy devices for both soft and bone marrow tissue cause significant trauma and inefficiency due to microfractures from oscillating movements, risk of sample damage during extraction, and insufficient locking forces leading to incomplete or lost samples.

Innovation Solution

A biopsy device featuring a first hollow cylindrical element with a deformable locking mechanism that closes its cross-section using ribs to securely detach tissue samples without relying on friction, ensuring complete and damage-free extraction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If oscillating movements are applied to the needle to detach the sample, then the sample can be separated from surrounding tissue, but microfractures are caused to the bone tissue creating significant trauma

Engineering Contradiction:

Improvesample detachmentVSAvoidmicrofractures and patient trauma

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The invention extracts the harmful oscillating motion from the procedure by using a stationary needle with a cutting edge that detaches the sample through a single rotational movement, eliminating the need for harmful back-and-forth oscillations that cause microfractures

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

Instead of using oscillating movements to detach the sample as in conventional devices, the invention inverts the approach by using a cutting edge that rotates to cleanly sever the sample, transforming the detachment mechanism from oscillation-based to rotation-based

Inventive Principle:

Principle #13The other way round (Inversion)

2Ease of operation

If the needle is extracted after sample collection, then the procedure is completed, but the sample may become damaged or lost during extraction

Engineering Contradiction:

Improveprocedure completionVSAvoidsample retention

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The invention applies preliminary action by pre-forming a recess at the distal end of the needle that will receive and secure the sample before extraction occurs, ensuring the sample is properly positioned and protected before the needle is removed from the patient

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The sample is nested within the hollow cylindrical structure of the needle, with the recess at the distal end providing an internal compartment that holds the sample securely during extraction, preventing damage or loss

Inventive Principle:

Principle #7Nested doll (Nesting)

3Reliability

If friction-based locking mechanisms are used to secure the sample, then the sample can be retained during extraction, but the locking force may be insufficient for complete detachment

Engineering Contradiction:

Improvesample retentionVSAvoidlocking mechanism complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The invention extracts the complex friction-based locking mechanism entirely, replacing it with a simple geometric recess structure that secures the sample through its shape rather than through friction or mechanical locking components

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention substitutes the mechanical friction-based locking system with a geometric solution where the recess shape itself provides the securing function, eliminating the need for complex locking mechanisms

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 device minimizes patient trauma and ensures complete sample detachment and retention, reducing the need for repeated procedures and sample loss.

Implementation Method 1

the locking element comprises a deformable portion of the first hollow cylindrical element, that is able to become deformed to enable a cross section of the first hollow cylindrical element to be closed

Methodology Applied

Scientific EffectDeformation: Deformation

Data Source

PatentUS9119612B2Device for transcutaneous biopsy

Publication Date: 2015.09.01 H S HOSPITAL SERVICE

AI summary

A biopsy device includes a first hollow cylindrical element, a second hollow cylindrical element inside which the first hollow cylindrical element is insertable and a locking element that is suitable for locking a tissue sample inside the first hollow cylindrical element. The locking element includes a deformable portion of the first hollow cylindrical element that is able to become deformed to enable a cross section of the first hollow cylindrical element to be closed, the deformable portion connecting a distal end of the first hollow cylindrical element to a body of the first hollow cylindrical element.