High-frequency Treatment Instrument Buffer Member Design
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Solution Overview
Problem
Existing high-frequency treatment instruments face challenges in efficiently delivering liquid and preventing tissue damage during endoscopic submucosal dissection, particularly due to the risk of tissue incision and bleeding, and the potential for the large-diameter portion to fall off or become damaged from excessive tensile forces.
Innovation Solution
A high-frequency treatment instrument featuring a flexible cylindrical sheath with a movable electrode member, a large-diameter insulating portion, and a buffer member that can elastically deform to seal the space between the distal-end member and the large-diameter portion, allowing for efficient liquid delivery and reducing the impact of tensile forces during electrode movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the electrode member is moved to the extreme proximal end to allow liquid discharge through the gap, then liquid discharge efficiency is improved, but the large-diameter portion may fall off or become damaged from excessive tensile forces
Solution Approach 1:
A buffer member is disposed between the distal-end member and the large-diameter portion to absorb excessive tensile forces when the electrode member is moved to the extreme proximal end. This cushioning mechanism prevents the large-diameter portion from falling off or becoming damaged while still allowing liquid to be discharged efficiently through the gap between the through-hole and the rod-shaped electrode portion.
2Productivity
If liquid is supplied via the flow path in the sheath to enable efficient liquid delivery, then liquid supply efficiency is improved, but tissue incision and bleeding may occur
Solution Approach 1:
The buffer member acts as an intermediary component that seals the space between the distal-end member and the large-diameter portion when the electrode member is in the extreme proximal position. This sealing function allows liquid supplied through the sheath's flow path to be directed effectively toward the treatment site without causing uncontrolled tissue incision or bleeding, while maintaining efficient liquid delivery.
3Reliability
If the buffer member seals the space between the distal-end member and the large-diameter portion, then liquid delivery control is improved, but the device complexity increases
Solution Approach 1:
The buffer member is designed as a flexible component that can elastically deform in the longitudinal direction to seal the space between the distal-end member and the large-diameter portion. This flexible sealing mechanism provides reliable liquid delivery control without requiring complex rigid sealing structures, thus minimizing device complexity while maintaining effective liquid delivery control.
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 solution enables efficient liquid discharge and effective hemostasis while preventing tissue incision and damage to the large-diameter portion, ensuring reliable operation and reducing the risk of the large-diameter portion falling off or becoming damaged.
Implementation Method 1
a buffer member which can be elastically deformed in the longitudinal direction when the electrode member is moved to the most proximal end side
Implementation Method 2
a liquid supply means that supplies liquid towards a front side in the longitudinal direction of the sheath via a flow path that is connected to a proximal end side of the sheath and that is formed in the sheath and via a gap between the through-hole and the electrode member
Implementation Method 3
an electrode member that is disposed inside the sheath so as to be advanceable/retractable in a longitudinal direction thereof and to which a high-frequency current is supplied
Data Source
AI summary
A high-frequency treatment instrument including: a sheath formed of a flexible material; an electrode member disposed inside the sheath; a distal-end member having a through-hole through which the electrode member passes; and a liquid supply means supplying liquid towards the front side via a flow path in the sheath, wherein the electrode member includes a rod-shaped electrode portion movably passing through the through-hole, and a large-diameter portion provided at the distal end thereof to have an outer diameter larger than the diameter of the through-hole, the large-diameter portion includes an electrode hole passing therethrough, between the distal-end member and the large-diameter portion, there is provided a buffer member that seals the periphery of a space between the distal-end member and the large-diameter portion.