Explantation Assembly for Intracorporeal Capsule Retrieval
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Solution Overview
Problem
The retrieval of autonomous capsules implanted in the human body, particularly in heart chambers, is challenging due to the risk of tissue damage and uncontrolled movements during explantation, especially when fibrosis and calcification are present, and the difficulty in accurately controlling snare fixation and cutting means.
Innovation Solution
An explantation assembly comprising a first tubular means with a snare and a cutting mechanism, and a second tubular means for defining a fixed-point in the tissue, allowing controlled operation of the snare and cutting, which includes features like a groove for snare interaction, a helical member for tissue attachment, and a lumen for contrast medium administration to ensure accurate positioning and safe removal of capsules covered by fibrosis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a snare is used to capture and remove the capsule, then the capsule can be retrieved from the heart chamber, but the risk of trapping and damaging valve tissue increases
Solution Approach 1:
The explantation assembly is divided into two separate tubular means: a first tubular means for capturing the capsule and a second tubular means for providing a fixed-point in the tissue. This segmentation allows the capsule to be captured and removed independently from the tissue anchoring function, reducing the risk of accidentally trapping valve tissue while maintaining effective capsule retrieval capability.
2Reliability
If the snare is tightened to secure the capsule, then the capsule can be firmly captured, but the risk of uncontrolled movement and tissue perforation increases
Solution Approach 1:
The second tubular means acts as an intermediary by providing a stable fixed-point in the tissue that does not move during the capture process. This fixed-point serves as a reference for controlling the snare tightening operation, allowing the operator to apply controlled force to secure the capsule while preventing uncontrolled movements that could lead to tissue perforation.
3Ease of operation
If cutting means are used to remove fibrosis tissue, then the capsule can be freed from fibrotic coverage, but the risk of sudden uncontrolled movement and tissue puncturing increases
Solution Approach 1:
The second tubular means provides a stable reference frame that enables real-time feedback control during the fibrosis cutting operation. The operator can monitor the position and movement of the cutting means relative to the fixed-point, allowing for controlled removal of fibrotic tissue while detecting and preventing sudden uncontrolled movements that could cause tissue puncturing.
4Ease of operation
If the explantation accessory is introduced through the peripheral venous system, then access to the heart chamber is achieved, but the difficulty of withdrawing the capsule through tight curves increases
Solution Approach 1:
The system separates the access function (first tubular means through venous system) from the anchoring function (second tubular means with fixed-point in tissue). This segmentation allows the capsule to be captured and secured at the heart chamber level while the venous access pathway remains independent, simplifying the withdrawal process by reducing the complexity of maneuvering through tight curves.
Data Source
AI summary
The present disclosure relates to an explantation assembly for retrieving an intracorporeal capsule implanted in a tissue of a patient comprising a first tube and a second tube. The first tube comprises a snare and a tissue. The second tube is configured to interact with the snare of the first tube and configured to be attached to the tissue of the patient.