Drug Pump Piston Rotation for Cylinder Wear Reduction
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Solution Overview
Problem
Drug pumps experience wear and tear due to repetitive piston motion, leading to uneven loading and localized damage, which is not effectively addressed by existing technologies.
Innovation Solution
Incorporating angled openings or contours in the armature portion of the actuator member to induce rotation of the piston during the pumping stroke, distributing wear more evenly around the periphery and reducing long-term degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the piston moves reciprocally in a straight line during pumping, then the pumping function is achieved, but uneven wear occurs at localized areas on the piston and cylinder
Solution Approach 1:
The patent introduces a rotational component to the traditionally linear reciprocating motion. The piston now performs a combined motion: reciprocating along the barrel axis while simultaneously rotating around it. This dynamic modification ensures that the piston contact point continuously changes around the cylinder perimeter, distributing wear evenly across the entire surface area rather than concentrating it at a single location.
Solution Approach 2:
The invention adds a rotational dimension to the original one-dimensional linear reciprocating motion. By introducing rotation around the piston axis, the contact between piston and cylinder transitions from a fixed linear path to a distributed circular path, effectively utilizing another spatial dimension to solve the wear distribution problem.
2Productivity
If the piston tips to one side due to uneven loads, then the pumping action continues, but a single location on the piston or cylinder experiences continuous wear
Solution Approach 1:
The rotational mechanism dynamically shifts the contact point around the piston-cylinder interface during each pumping cycle. Even if load unevenness causes the piston to preferentially contact one side, the continuous rotation ensures that this contact point moves around the perimeter, preventing any single location from experiencing continuous wear while maintaining the pumping function.
Solution Approach 2:
The invention converts the potentially harmful effect of uneven loading and piston tipping into a beneficial wear distribution mechanism. Rather than allowing the piston to remain stationary and wear one spot, the rotation transforms the tipping motion into a wear-distributing rotation, turning a reliability problem into a solution.
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 rotational movement of the piston during each stroke distributes wear more evenly, reducing the risk of localized damage and extending the lifespan of the pump components.
Implementation Method 1
The movement of fluid through passages of a certain size and shape during the pumping process may induce the rotation of the piston in the piston cylinder some predetermined amount at every stroke.
Implementation Method 2
when the solenoid is energized, magnetic flux causes the actuator to move very quickly (i.e. in the order of 2-3 milliseconds) until it reaches a stop member
Implementation Method 3
When the solenoid is de-energized, the lack of magnetic flux allows the actuator to return to its original position under the force of a spring or other return mechanism
Implementation Method 4
The reduced pressure in the piston chamber causes infusion media to flow from a reservoir through an annulus between the actuator piston and the piston cylinder wall to refill the piston chamber
Data Source
AI summary
The present invention relates to a method and related apparatus for rotating a piston of a drug pump during the pumping stroke to reduce drug pump wear. The actuator may move a piston that pumps fluid through a pumping channel. In the present invention, the armature includes one or more openings or shapes that cause the actuator, including the armature and the piston, to rotate about a longitudinal axis of the piston during the pumping stroke. Rotation of the actuator member may help to reduce wear to the actuator member and the pump itself caused by repetitive pumping motions.