Implantable Piston Pump With Integrated Elastic Ring Collar
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Solution Overview
Problem
Conventional implantable piston pumps for pumping cerebrospinal fluid suffer from friction losses, require separate sealing elements, and are prone to increased energy consumption due to ambient pressure fluctuations, which affect their service life and reliability.
Innovation Solution
The piston design incorporates a form-stable disc portion with an elastic ring collar portion that is fixedly and fluid-tightly connected to both the disc and the wall, eliminating the need for separate sealing elements and reducing friction, while the ring collar portion's elastic deformation supports a spring-like return mechanism, enhancing robustness and energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional piston pumps use piston sealing means lying on the cylinder inner wall in slidingly movable fashion, then sealing between piston and cylinder is achieved, but friction losses increase and service life decreases
Solution Approach 1:
The invention merges the sealing function and the support function into a single integrated structure. The elastic ring collar portion serves both as a sealing element against the cylinder inner wall and as a support element for the disc portion, eliminating the need for separate sliding sealing means and reducing friction losses while improving reliability
Solution Approach 2:
The elastic ring collar portion functions as a flexible sealing element that deforms elastically during operation. This flexible structure provides effective sealing against the cylinder inner wall while accommodating movement and reducing friction compared to rigid sliding seals, thereby extending service life and reducing energy losses
2Reliability
If separate sealing elements are used in conventional piston pumps, then fluid-tight sealing is achieved, but device complexity increases and manufacturing cost increases
Solution Approach 1:
The invention combines multiple functions into the elastic ring collar portion: sealing against the cylinder wall, support for the disc portion, and fluid-tight connection between the disc and cylinder. This integration eliminates separate sealing elements and simplifies the overall structure while maintaining reliable fluid-tight sealing
Solution Approach 2:
The elastic ring collar portion is designed as a multi-functional component that simultaneously provides sealing, support, and fluid-tight connection functions. This universal component replaces multiple separate elements, reducing device complexity and manufacturing cost while ensuring reliable sealing
3Productivity
If conventional piston pumps operate with friction against the cylinder wall, then pumping action is maintained, but energy consumption increases
Solution Approach 1:
The elastic ring collar portion provides necessary friction for pumping action while its elastic properties allow it to deform and recover, reducing continuous sliding friction. This flexible sealing approach maintains effective pumping action while minimizing energy consumption compared to conventional sliding seals
Solution Approach 2:
The elastic ring collar portion dynamically adapts to the pumping motion, deforming elastically during the stroke cycle. This dynamic behavior allows the sealing element to maintain contact for pumping action while reducing frictional energy losses through elastic deformation rather than continuous sliding friction
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 design achieves a simplified, robust, and cost-effective structure with reduced friction losses, extended service life, and energy-efficient operation by minimizing friction and compensating for ambient pressure fluctuations, thereby improving patient safety and reducing maintenance needs.
Implementation Method 1
the ring collar portion is elastic. Accordingly, during the stroke movement of the piston, the ring collar portion is elastically deformed
Data Source
AI summary
An implantable pump for pumping body fluid has a piston which is reciprocatingly movable along a stroke axis, with a piston head, a wall opposite the piston head, and a pump volume enclosed between the piston head and the wall. A stroke movement of the piston causes a change in pump volume and delivery of body fluid between an inlet and an outlet. The piston has a disc, the underside of which forms the piston head, and an elastic ring collar that protrudes radially from the disc. An inner periphery of the ring collar is fixedly and fluid-tightly connected to an outer periphery of the disc, and at an outer periphery of the ring collar is fixedly and fluid-tightly connected to the wall. The disc rests via the ring collar on the wall so as to be reciprocatingly movable relative to the wall and fluid-tightly connected to the wall.