Resection Device Spacer Mechanism for Safe Tissue Severing
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Solution Overview
Problem
Existing minimal-invasive tissue resection devices, such as those for the stomach or colon, often fail to adequately remove deeply seated diseased tissue and pose a risk of wall perforation, which can have detrimental consequences for patients.
Innovation Solution
A resection device featuring a cup-shaped endoscope cap with an expanding sleeve that houses a tissue clip and a cutting device, where the cutting device is positioned at a predetermined distance from the clip to prevent contact, allowing for safe severing of tissue without bursting the clip, and utilizing a thread or cable mechanism for efficient clip deployment and withdrawal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the cutting device is positioned close to the tissue clip to enable efficient tissue removal, then productivity is improved, but the risk of the cutting device contacting and bursting the clip increases, compromising reliability
Solution Approach 1:
A spacer component is introduced as an intermediary element between the cutting device and the tissue clip. The spacer maintains a predetermined distance of 1-5mm between the cutting device and clip, preventing direct contact while allowing the cutting device to effectively remove tissue. This mediator resolves the contradiction by enabling close proximity for productivity while preventing harmful contact for reliability.
2Reliability
If the cutting device is positioned at a greater distance from the tissue clip to prevent contact, then reliability is improved, but the effectiveness of tissue removal decreases, worsening productivity
Solution Approach 1:
The spacer is pre-positioned within the expanding sleeve to establish the optimal distance between the cutting device and tissue clip before the procedure begins. This preliminary arrangement ensures that during tissue removal, the cutting device operates at the maximum effective distance from the clip without risk of contact, simultaneously optimizing both reliability and productivity.
3Manufacturing precision
If a rigid fixation structure is used to hold the cutting device at a fixed distance from the clip, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The spacer is designed as a thin-walled component that provides sufficient rigidity to maintain the predetermined distance of 1-5mm between the cutting device and clip, while its thin structure minimizes added complexity. The flexible yet structurally sound design achieves the required manufacturing precision without significantly increasing device complexity.
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
This design enables safer and more effective resection of tissue by ensuring the cutting device does not contact the clip, maintaining tissue closure and reducing the risk of perforation, while allowing for efficient tissue removal with minimal displacement force.
Implementation Method 1
The hinges 130 or the flexible moldings are preferably formed of spring-elastic straps which when opening the jaws 110, 120 store spring energy which results in snapping the jaws 110, 120 at a predetermined clamping force when the jaws 110, 120 are released
Implementation Method 2
The cable loop is further connected to the outside via a power supply cable which is movably guided through an endoscope shaft
Data Source
AI summary
A resection device comprising a cup-shaped cap for a shaft-type inserting means is disclosed which is fixed at the distal end of the shaft-type inserting means or is formed at the same and includes an expanding sleeve portion to which a spring-biased tissue clip is attached which can be withdrawn by means of a releasing or withdrawing device over the distal front edge of the cap.In accordance with the invention, inside the expanding sleeve portion a cutting device is arranged which is held at the inner wall of the expanding sleeve portion at a predetermined axial distance from the distal front edge of the cap.