Hemostasis Valve Roller Seal Reduces Insertion Force
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Solution Overview
Problem
Conventional hemostasis valves require high force for inserting and removing medical devices due to the frictional force applied by gaskets, making controlled insertion difficult.
Innovation Solution
A hemostasis valve design featuring a rotating roller and elastically deformable sleeve that adjusts its position to accommodate medical devices, reducing the force required for insertion and removal while maintaining a fluid-tight seal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional hemostasis valve with gaskets is used, then a fluid-tight seal is maintained, but high force is required for insertion and removal of medical devices
Solution Approach 1:
The patent applies the dynamics principle by making the sealing surface movable through a roller mechanism. The roller rotates to accommodate the medical device during insertion and removal, allowing the seal to dynamically adjust its position rather than relying on static friction from gaskets. This reduces the force required while maintaining the fluid-tight seal.
Solution Approach 2:
The patent replaces the conventional gasket-based mechanical sealing system with a roller-based sealing system. Instead of using elastic gaskets that create high friction, the invention uses a roller that rotates to provide the seal, substituting the mechanical friction-based sealing mechanism with a rolling contact mechanism that requires significantly less force.
2Reliability
If gaskets with shaped slits are used to form a seal, then fluid tightness is achieved, but controlled insertion of the medical device becomes difficult
Solution Approach 1:
The roller mechanism provides dynamic adjustment during insertion, allowing the seal to move with the device rather than creating fixed friction points. This enables smooth, controlled insertion by reducing the resistance that would otherwise make precise control difficult.
Solution Approach 2:
The patent substitutes the gasket-based sealing mechanism with a roller-based mechanism, replacing the friction-dominated interaction with a rolling contact that provides smoother, more controllable movement during device insertion.
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 allows for easier and more controlled insertion and removal of medical devices with reduced force, enhancing clinical efficiency by minimizing frictional resistance.
Implementation Method 1
The sleeve is elastically deformable. The sleeve is configured to assume a first form when the medical device is absent from the cavity wherein a radially inner surface of the sleeve is located at a first distance from the central section of the roller. The sleeve is also configured to assume a second form when the medical device is present in the cavity wherein the radially inner surface of the sleeve is located at a second distance from the central section of the roller
Data Source
AI summary
A hemostasis valve has a housing having proximal and distal ends defining proximal and distal openings configured for passage of a medical device therethrough. The housing further defines a cavity between the proximal and distal ends. One or more rollers are received within the cavity and define end sections and a central section having a smaller diameter than the end sections. Sleeves are disposed about the rollers and are elastically deformable to form a fluid seal around the device. The sleeves each assume a first form when the device is absent from the cavity wherein a radially inner surface of the sleeve is located at a first distance from the central section of a roller and a second form when the device is present in the cavity wherein the surface is located at a second distance, less than the first distance, from the central section of the roller.