Implantable Piston Pump With Elastic Collar Sealing
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Solution Overview
Problem
Conventional implantable piston pumps for body fluids suffer from complex designs, high frictional losses, and increased failure risks due to sliding friction between the piston and cylinder, leading to reduced service life and increased manufacturing costs.
Innovation Solution
An implantable pump device with a piston design featuring a dimensionally stable disc section and an elastic annular collar section, where the annular collar is rigidly connected to both the disc and the wall, eliminating sliding friction and requiring no separate sealing elements, and utilizing a material-bonded or welded connection for enhanced robustness and simplicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional piston pumps with sliding piston and cylinder wall are used, then pumping function is achieved, but frictional losses increase and service life decreases
Solution Approach 1:
The invention extracts and eliminates the sliding friction interface between piston and cylinder wall by using a plunging piston design that moves perpendicular to the wall surface, removing the source of frictional losses and extending service life
Solution Approach 2:
Instead of the piston sliding along the cylinder wall (parallel motion), the piston plunges perpendicular to the wall surface, inverting the motion direction to eliminate friction while maintaining pumping function
2Reliability
If piston sealing rings sliding against cylinder wall are used, then fluid sealing is achieved, but device complexity increases
Solution Approach 1:
The invention extracts and removes the separate piston sealing rings and cylinder wall sealing structures, replacing them with a simplified plunging piston design that achieves fluid sealing through the rigid connection of the annular collar to the wall without sliding contact
Solution Approach 2:
The annular collar is rigidly connected to both the disc section and the wall, merging multiple sealing and support functions into a single integrated structure that eliminates the need for separate sealing elements
3Reliability
If conventional multi-component piston design is used, then pumping function is achieved, but manufacturing costs increase
Solution Approach 1:
The piston is designed as a single-piece component where the disc section and annular collar are rigidly connected as one integral structure, merging multiple components into one that simplifies manufacturing and reduces assembly steps while maintaining pumping reliability
Solution Approach 2:
The annular collar performs multiple functions simultaneously: it provides fluid-tight sealing against the wall, supports the disc section during plunging motion, and eliminates the need for separate sealing rings, reducing overall component count and manufacturing 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
The simplified design reduces frictional losses, increases service life, lowers manufacturing costs, and enhances patient safety by minimizing failure risks, while enabling energy-efficient operation and compact construction.
Implementation Method 1
the annular collar section is elastically designed. Consequently, the annular collar section deforms elastically during the piston's stroke
Data Source
Figure 1
Figure 2
Figure 3~5
AI summary
An implantable pump device (1) for pumping a body fluid, comprising: a piston (2, 2') that is reciprocatingly movable along a stroke axis and has a piston base (3); a wall (4, 4') opposite the piston base; and a pump volume (V) enclosed between the piston base and the wall, which forms a section of a fluid path (F) extending between an inlet (E) and an outlet (A), wherein a stroke movement of the piston brings about a change in the pump volume and, consequently, the body fluid is pumped between the inlet and the outlet. According to the invention, the piston has a dimensionally stable discoid portion (5), with the underside thereof forming the piston base, and an elastic annular collar portion (6, 6'), wherein the elastic annular collar portion protrudes radially from the discoid section, its inner circumference is connected in a secure and fluid-tight manner to an outer circumference of the discoid section and its outer circumference is connected in a secure and fluid-tight manner to the wall.