Inflatable Coaxial Needle Anchoring for Biopsy Hemostasis
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Solution Overview
Problem
Conventional coaxial needles used in biopsy procedures often back out of the needle tract, causing bleeding and tissue damage, and the process of freezing the needle to prevent this is difficult to reverse.
Innovation Solution
A coaxial needle with inflatable members that apply outward pressure along their length to secure the needle in place, using a pressure source assembly to control inflation and deflation for precise anchoring and hemostasis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If compressed hydrogen or argon gas is released at the needle tip to freeze the needle within the biopsy tract, then the coaxial needle is secured in place, but additional damage to the tissue in the biopsy tract occurs
Solution Approach 1:
The patent uses inflatable members that can be inflated with fluid or gas to expand and anchor the coaxial needle within the biopsy tract. This pneumatic/hydraulic approach provides secure anchoring without the extreme cold temperatures of freezing, thereby avoiding additional tissue damage while maintaining needle stability.
Solution Approach 2:
The patent changes the anchoring mechanism from thermal (freezing) to mechanical (inflation). By inflating the members, the system transitions from a thermal field to a mechanical expansion field, achieving secure anchoring through volume increase rather than temperature decrease, thus avoiding tissue damage associated with freezing.
2Reliability
If compressed hydrogen or argon gas is released at the needle tip to freeze the needle within the biopsy tract, then the coaxial needle is secured in place, but the process is difficult to reverse
Solution Approach 1:
The patent employs dynamically controllable inflatable members that can be inflated and deflated on demand. This dynamic system allows the needle to be securely anchored when inflated and easily adjusted or removed when deflated, providing reversibility and adaptability that frozen needles lack.
Solution Approach 2:
The inflatable members can be periodically inflated and deflated during the procedure as needed. This periodic action allows for secure anchoring during tissue acquisition and easy adjustment or removal when the procedure is complete or modification is needed, unlike the permanent freezing process.
3Reliability
If the first inflatable member is inflated to secure the coaxial needle, then the needle is anchored in the biopsy tract, but the biopsy void created by sample removal cannot be filled
Solution Approach 1:
The patent divides the anchoring function into two separate inflatable members: one for anchoring the needle and another for addressing the biopsy void. This segmentation allows each member to perform its specific function independently - the first member secures the needle while the second member can be inflated to fill the void and control bleeding.
Solution Approach 2:
The second inflatable member acts as an intermediary element between the biopsy void and the surrounding tissue. When inflated, it fills the void created by sample removal, applies pressure to control bleeding, and can be deflated and removed without affecting the first inflatable member that continues to secure the needle.
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 inflatable members effectively anchor the needle, preventing movement and bleeding, while allowing for easy adjustment and minimizing tissue damage during biopsy procedures.
Implementation Method 1
The first inflatable member may apply an outward pressure along its entire length in the inflated state
Implementation Method 2
The second inflatable member may apply outward pressure to the biopsy void in the second inflated state
Data Source
AI summary
A coaxial needle for performing a biopsy procedure includes a cannula and a stylet. The cannula has a proximal end and a distal end, and a first inflatable member surrounds the cannula in a circumferential direction from the proximal end to the distal end. The first inflatable member applies an outward pressure along the entire length of the first inflatable member in an inflated state.