Biopsy Driver Lead Screw for Low-Drag Tissue Sampling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current motor-driven biopsy devices face challenges with sterilization post-use, leading to reduced device lifespan, and they experience increased drag during tissue introduction due to the open state of the tissue receiving opening.
Innovation Solution
A biopsy system driver is introduced, featuring a motor with a rotatable output shaft, a support structure, a drive shaft, an elongate lead screw, and a biopsy instrument drive member. This system includes a reversible motor, a dwell spring assembly, and a cam mechanism to control the axial translation and rotation of the biopsy instrument components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the tissue receiving opening is kept in an open state during introduction, then tissue sampling capability is maintained, but drag during introduction into tissue increases
Solution Approach 1:
The biopsy device employs a dynamic tissue receiving opening that transitions between open and closed states. The opening is closed during introduction to minimize drag, then opened at the target site to enable tissue sampling. This dynamic state change resolves the contradiction by allowing the system to optimize for drag reduction during insertion and for sampling capability during operation.
2Reliability
If motor driven biopsy devices are sterilized after use, then infection control is achieved, but device lifespan is shortened
Solution Approach 1:
The biopsy device is divided into sterilizable components (motor housing, drive mechanism) and disposable components (needle assembly, tissue receiving opening). The disposable components are discarded after single use, eliminating the need for repeated sterilization that would degrade the device. The permanent components can be sterilized once and then used with multiple disposable attachments, resolving the contradiction between infection control and device lifespan.
3Ease of operation
If the lead screw is made axially movable relative to the drive shaft, then controlled translation of biopsy instrument is achieved, but device complexity increases
Solution Approach 1:
The lead screw acts as an intermediary mechanism between the rotational motion of the drive shaft and the linear translation required for biopsy instrument deployment. By converting rotational motion to linear motion through threaded engagement, the system achieves precise controlled translation without requiring complex linear actuators or motor arrangements, thus resolving the contradiction between controllability and simplicity.
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 biopsy system driver enhances the efficiency and reliability of biopsy procedures by reducing drag during tissue introduction, improving sterilization processes, and extending device lifespan through controlled mechanical operations.
Implementation Method 1
an elongate lead screw coupled to the drive shaft such that rotation of the drive shaft rotates the lead screw about an axis of the lead screw. The lead screw is axially translatable relative to the drive shaft and to the support structure
Implementation Method 2
a biopsy instrument drive member threadably coupled to the lead screw such that rotation of the lead screw causes axial translation of one of the lead screw and biopsy instrument drive member relative to the other one
Data Source
AI summary
A biopsy system driver includes a motor having a rotatable output shaft, a support structure, a drive shaft, an elongate lead screw and a biopsy instrument drive member. The drive shaft is rotatably coupled to the support structure and includes or is otherwise operatively connected to the motor output shaft such that activation of the motor rotates the drive shaft. The elongate lead screw is coupled to the drive shaft such that rotation of the drive shaft rotates the lead screw about an axis of the lead screw. The lead screw is axially translatable relative to the drive shaft and to the support structure. The biopsy instrument drive member is threadably coupled to the lead screw such that rotation of the lead screw causes axial translation of one of the lead screw and biopsy instrument drive member relative to the other one and to the support structure.