Coaxial Biopsy Needle Locking and Translation for Precise Sampling
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Solution Overview
Problem
Existing biopsy techniques face challenges in efficiently and precisely sampling tissue, particularly in dense or fibrotic tissues, due to cumbersome manual insertion of large diameter needles and the need for precise control to avoid injury to surrounding vessels and organs.
Innovation Solution
A biopsy arrangement with an activator that controls both the locking and positioning of inner and outer needle parts through a single linear movement, allowing for efficient insertion and sampling by locking the needle parts together during insertion and releasing for sampling, facilitated by a motor-controlled mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If manual insertion of large diameter needles is used for core needle biopsy, then large volume tissue sampling is achieved, but the insertion process becomes cumbersome and difficult to control
Solution Approach 1:
The needle assembly is divided into multiple segments: an outer needle for insertion and an inner needle for sample retrieval. The inner needle can be independently advanced or retracted relative to the outer needle, allowing the large outer needle to penetrate tissue easily while the smaller inner needle performs the actual sampling function
Solution Approach 2:
The inner needle is nested within the hollow lumen of the outer needle. This nested configuration allows the inner needle to be guided through the outer needle during insertion, reducing resistance and improving control during the insertion process while maintaining the ability to retrieve large tissue samples
2Strength
If manual force is applied to navigate the needle through dense tissue, then penetration is achieved, but control over vessel and organ injury is reduced
Solution Approach 1:
The needle assembly incorporates dynamic control mechanisms including spring-loaded components and movable inner/outer needle configurations that allow real-time adjustment during insertion. This enables the physician to control the advancement and retraction of needle components, improving precision and reducing the risk of injury to surrounding structures
Solution Approach 2:
The outer needle acts as an intermediary guide that protects surrounding tissues during insertion while the inner needle performs the actual sampling. This two-stage approach allows the outer needle to navigate dense tissue with controlled force while the inner needle, which remains retracted during initial penetration, minimizes damage to vessels and organs
3Ease of operation
If separate control mechanisms are used for locking and positioning needle parts, then precise control is achieved, but device complexity increases
Solution Approach 1:
The locking mechanism and positioning mechanism are merged into a single integrated system. The inner needle's movement relative to the outer needle simultaneously achieves both locking (when stationary at the sampling position) and positioning (during advancement and retraction), eliminating the need for separate control mechanisms
Solution Approach 2:
The inner needle serves multiple functions: it acts as both the sampling element and the positioning/locking mechanism. By advancing or retracting the inner needle relative to the outer needle, the system achieves sample retrieval, position adjustment, and locking/unlocking all through a single component's movement
Data Source
AI summary
A biopsy arrangement for taking a biopsy in a human or animal tissue, said biopsy arrangement comprising: —a needle arrangement (3) comprising an elongated inner needle part (5) and an elongated outer needle part (7), which outer needle part (7) is a hollow member in which the inner needle part (5) fits coaxially, wherein the two needle parts can be provided in at least two different positions in relation to each other; —an activator (11) which is arranged in the biopsy arrangement (1) such that it can be moved within the biopsy arrangement, said activator (11) comprising: —a first activating part (13) which is configured to control a needle locking device (21) provided in the biopsy arrangement (1) to lock or not lock the inner needle part (5) and the outer needle part (7) to each other; and —a second activating part (15) which is configured to control a needle translation device (31) provided in the biopsy arrangement (1) to change a position of the inner (5) and outer needle parts (7) in relation to each other, said needle translation device (31) being connected to at least one of the inner or outer needle parts (5, 7), whereby a movement of the activator (11) within the biopsy arrangement (1) can affect a position of both the first and the second activating parts (13, 15) whereby both the needle locking device (21) and the needle translation device (31) can be controlled.