Adjustable-throw biopsy needle with interchangeable insert
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Solution Overview
Problem
Biopsy needles are typically designed to obtain fixed-length tissue samples, requiring multiple devices to be stocked for varying needs, leading to inconvenience and increased costs due to uncertainty in sample size requirements.
Innovation Solution
A biopsy needle system with an inner stylet and outer cannula, where an insert member can be attached to the handle to change the sampling size, allowing for adjustable sample lengths by impeding the distal movement of the stylet relative to the cannula, enabling two or more sample sizes without the need for multiple devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple biopsy needles with different fixed sample lengths are stocked, then the appropriate sample size can be obtained for different situations, but the device complexity and inventory requirements increase
Solution Approach 1:
The biopsy needle system is designed to perform multiple functions by allowing interchangeable insert members with different shaft lengths. A single needle assembly can obtain samples of different lengths (e.g., 10mm or 20mm) by swapping inserts, eliminating the need to stock multiple separate biopsy needle products and achieving multi-functionality.
Solution Approach 2:
The biopsy needle is divided into separable components: a reusable needle assembly and interchangeable insert members. The insert members are segmented by length (e.g., different shaft lengths) and can be attached or detached as needed, allowing the system to adapt to different sampling requirements without requiring multiple complete devices.
2Ease of operation
If a fixed sample length needle is used, then the device structure is simple, but the flexibility to adjust sample size is lost
Solution Approach 1:
The biopsy needle system transitions from a static fixed-length design to a dynamic adjustable design. The insert members with different shaft lengths can be selected and attached based on the specific clinical situation, allowing the effective sampling length to be dynamically changed while maintaining a relatively simple overall device structure.
3Adaptability or versatility
If multiple biopsy needle products are stocked, then all sample size needs can be met, but the administrative burden and costs increase
Solution Approach 1:
By making the needle assembly universal and compatible with multiple insert lengths, the system eliminates the need to track and manage multiple separate biopsy needle products. The administrative burden of inventory accounting and product selection is reduced while still providing coverage for different sample size needs through simple insert interchangeability.
Data Source
AI summary
Among other things, there is disclosed a biopsy needle system in which the needle is capable of obtaining more than one length of sample. Generally, the needle includes an inner stylet, an outer cannula, and a handle connected to the stylet and cannula. The stylet has a notch that is extendable from the cannula to accommodate a tissue sample. An insert member is provided for attachment to the handle to make the amount of exposed notch smaller. Consequently, when the insert member is not attached to the handle, the needle can obtain a larger sample of tissue, and when the insert member is attached to the handle, the needle can obtain a smaller sample of tissue.