Hemostatic Spring Radial Segments Reduce Insertion Resistance
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Solution Overview
Problem
Conventional hemostatic valves resist the insertion of medical devices, complicating procedures and potentially damaging the device or its components.
Innovation Solution
The development of hemostatic springs and seals with a radial array of spring segments, allowing for dynamic changes in force application during device insertion, thereby reducing resistance and improving control during surgical procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional biasing mechanisms are used in hemostatic valves, then blood loss is prevented, but device insertion resistance increases
Solution Approach 1:
The hemostatic spring incorporates a radial array of spring segments that can dynamically adjust their configuration. During device insertion, the segments can splay outward to reduce resistance, and during hemostasis, they converge to provide sealing pressure. This dynamic adaptability resolves the contradiction between preventing blood loss and facilitating device insertion.
Solution Approach 2:
The hemostatic spring is divided into multiple independent spring segments arranged radially. Each segment can move independently, allowing the structure to flex and adapt during device passage while maintaining overall hemostatic function. This segmentation enables the valve to provide both low insertion resistance and effective sealing.
2Reliability
If high biasing force is applied to prevent blood loss, then hemostatic sealing is improved, but device insertion becomes more difficult
Solution Approach 1:
The spring segments dynamically adjust their biasing force based on the operational phase. During insertion, the segments are positioned to minimize radial outward force on the device. During hemostasis, the segments converge to maximize sealing pressure. This dynamic force modulation resolves the contradiction between hemostatic sealing and insertion resistance.
Solution Approach 2:
The structural parameters of the spring segments (such as their radial position and angle) are changed between operational phases. By adjusting these parameters, the biasing force exerted by the spring varies dynamically, providing low force during insertion and high force during sealing, thus resolving the force contradiction.
3Ease of operation
If radial array of spring segments is used to reduce insertion resistance, then device insertion is facilitated, but control over hemostatic pressure becomes more complex
Solution Approach 1:
The hemostatic spring is segmented into multiple independent radial elements that can move independently. This segmentation simplifies the control mechanism because each segment responds autonomously to radial forces during insertion, automatically providing low resistance without complex active control systems.
Solution Approach 2:
The spring segments are designed to automatically adjust their configuration in response to applied forces. During device insertion, the segments naturally splay outward to reduce resistance without requiring external control. During hemostasis, they naturally converge to provide sealing pressure. This self-adjusting behavior reduces operational complexity despite the segmented structure.
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 solution provides clinicians with greater control over the surgical procedure, balancing pressure to resist blood loss while minimizing resistance to device insertion, thus reducing complications and damage.
Implementation Method 1
a radial array of spring segments positioned on a circular path about a central axis. Each spring segment of the radial array of spring segments comprises a first end, a second end, and a central location positioned between the first end and the second end
Implementation Method 2
The hemostatic seal is configured to reduce the distance between the proximal mount and the distal mount along the central axis to constrict the radial array of spring elements to reduce a cross-sectional area of the central passage
Data Source
AI summary
Hemostatic springs and hemostatic seals comprising hemostatic springs facilitate introducing a surgical device into the vasculature of a patient during a surgical procedure. Each hemostatic spring comprises a radial array of spring segments positioned on a circular path about a central axis. Each hemostatic seal is configured to reduce an axial length of the hemostatic spring to constrict the radial array of spring segments to reduce a cross-sectional area of the central passage. Methods include axially inserting the surgical device into the hemostatic seal while compression from the hemostatic seal minimizes fluid leakage. Methods can further include reducing a frictional force of inserting the device into the hemostatic seal by reducing the axial compression to dilate the hemostatic spring.