Adjustable Throw Percutaneous Needle Ratchet Mechanism
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Solution Overview
Problem
Current needle biopsy procedures often face difficulties in acquiring sufficient tissue samples for definitive diagnosis, as existing devices may not efficiently expose the necessary length of the inner needle to collect cells or tissue effectively.
Innovation Solution
A biopsy device with a handle assembly that includes a ratchet mechanism to adjust the throw length of the inner needle relative to the outer needle, allowing for a controlled exposure of the inner needle to collect tissue samples, featuring a spring mechanism to facilitate the transition between insertion and tissue collection configurations, and a cutting edge on the outer needle to trap the sample.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the inner needle is exposed to collect tissue samples, then the tissue sample collection capability is improved, but the risk of premature sample collection or improper positioning worsens
Solution Approach 1:
The inner needle is designed to be movable relative to the outer needle, transitioning between a retracted position (during insertion) and an extended position (during tissue collection). This dynamic configuration allows the system to adapt to different operational phases, ensuring reliable positioning during insertion while enabling effective tissue exposure during collection.
Solution Approach 2:
The device pre-positions the inner needle within the outer needle during the insertion phase, ensuring that the opening is covered before reaching the target tissue. This preliminary configuration prevents premature sample collection and ensures accurate positioning before the tissue collection action is initiated.
2Device complexity
If a fixed needle configuration is used, then the device structure is simplified, but the adaptability to different tissue collection requirements worsens
Solution Approach 1:
The adjustable throw mechanism allows the inner needle to be extended to different lengths relative to the outer needle, enabling adaptation to various tissue collection requirements. This dynamic adjustability provides versatility without requiring multiple fixed-configuration devices, balancing structural complexity with adaptability.
Solution Approach 2:
The device allows changing the throw length parameter of the inner needle to match different clinical requirements. By adjusting this parameter, the system can adapt to various tissue depths and collection needs while maintaining a single device structure, avoiding the complexity of multiple specialized devices.
3Quantity of substance
If the inner needle extends beyond the outer needle during insertion, then tissue collection is improved, but the risk of tissue damage or improper insertion worsens
Solution Approach 1:
The device ensures the inner needle is held retracted within the outer needle during the insertion phase, preventing tissue damage from premature exposure. The opening of the inner needle is covered by the outer needle until the target tissue is reached, eliminating the harmful effect of improper insertion.
Solution Approach 2:
The relative position of the inner and outer needles changes dynamically: the inner needle remains retracted during insertion (safe configuration) and extends only after reaching the target tissue (collection configuration). This dynamic control eliminates the trade-off by sequencing the actions in the correct order.
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
Enables the collection of a larger tissue sample by allowing a user-selectable throw length of the inner needle, improving the potential for accurate diagnosis and efficient sample collection while ensuring the sample is cut and trapped within the device.
Implementation Method 1
a spring member housed between the second handle member and the core member to bias the biopsy device toward the insertion configuration
Implementation Method 2
the core member including ratchet teeth along a length thereof for engaging the engaging element in the engaging configuration at a user-selected position
Data Source
AI summary
A device for collecting a tissue sample includes an outer needle extending longitudinally from a proximal end to a distal end and including a lumen extending therethrough. The device also includes an inner needle extending longitudinally from a proximal end to a distal end and including an opening extending laterally in and along a length thereof. The inner needle is sized and shaped to be slidably received within the lumen of the outer needle and movable relative thereto between an insertion configuration, in which the opening is covered by the outer needle, to a tissue collecting configuration, in which the opening is exposed. In addition, the device includes a handle assembly for adjusting a throw length of the inner needle relative to the outer needle.