Non-Coplanar Peristaltic Pump Cassette Reduces Vibrations
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Solution Overview
Problem
Conventional peristaltic pumps used in surgical applications often apply excessive normal force, leading to vibrations that can interfere with pressure sensor functionality and reduce the efficiency of fluid aspiration and irrigation processes.
Innovation Solution
A surgical cassette with non-coplanar peristaltic pumps, featuring a ring-shaped sheet and cup-shaped substrate configuration, where the pump segments are angled relative to the axis of rotation, allowing for reduced normal force application and enhanced fluid flow by engaging rollers that compress the sheet against the substrate, thereby minimizing vibrations and improving sensor accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional peristaltic pumps apply normal force to compress tubing, then fluid pumping function is achieved, but excessive normal force causes vibrations that interfere with pressure sensor functionality
Solution Approach 1:
The patent transitions from a coplanar pump configuration to a non-coplanar configuration where the pump segments are positioned at an angle relative to the face of the cassette. This dimensional change allows the rollers to apply compressive force more efficiently while reducing the normal force transmitted to the cassette body, thereby minimizing vibrations that interfere with pressure sensor functionality.
Solution Approach 2:
The patent changes the geometric parameters of the pump configuration by positioning pump segments at a specific angle (non-coplanar arrangement) relative to the cassette face. This parameter change optimizes the force application direction, allowing effective fluid pumping with reduced normal force and minimized vibrations.
2Productivity
If conventional peristaltic pumps apply normal force to compress tubing, then fluid pumping function is achieved, but excessive normal force reduces the efficiency of fluid aspiration and irrigation processes
Solution Approach 1:
By transitioning to a non-coplanar pump configuration where pump segments are angled relative to the cassette face, the patent enables more efficient force application. This dimensional change allows the rollers to compress the tubing more effectively, improving fluid flow efficiency while requiring less normal force from the rollers.
Solution Approach 2:
The patent optimizes the geometric parameters of the pump system by positioning pump segments at a specific angle, which changes the force application characteristics. This parameter optimization enables efficient fluid pumping with reduced normal force requirements.
3Object-affected harmful factors
If coplanar pump configuration is used, then device simplicity is maintained, but normal force cannot be effectively reduced to minimize vibrations
Solution Approach 1:
The patent introduces a non-coplanar configuration where pump segments are positioned at an angle relative to the cassette face, representing a dimensional change from the conventional coplanar arrangement. This change effectively reduces normal force and vibrations while maintaining reasonable device complexity through a straightforward geometric modification.
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 non-coplanar design reduces normal force on the cassette, minimizing vibrations and enhancing the accuracy of pressure sensors while increasing fluid flow efficiency by allowing the rollers to apply force in a direction that is not parallel to the axis of rotation, thus improving the overall performance of fluid aspiration and irrigation during surgical procedures.
Implementation Method 1
Rotating roller heads applied against the tubing or elastomeric sheet may be used for compressing the tubing or elastomeric sheet
Implementation Method 2
Peristaltic pumps may operate by compressing a length of tubing to move a fluid in the tubing or squeezing a molded flow channel between an elastomeric sheet and a rigid substrate to move a fluid between the elastomeric sheet and the rigid substrate
Data Source
AI summary
Certain aspects of the present disclosure provide a surgical cassette configured to engage a first plurality of rollers of a first roller head. The cassette comprises a face coupled to a first substrate, the face being at a first angle with respect to the first roller head's axis of rotation and a wall of first substrate being at a second angle with respect to the axis of rotation, wherein the first angle is different from the second angle. The cassette also comprises a first sheet positioned on the wall's surface, wherein the first sheet and the wall form first one or more pump segments configured to engage the first plurality of rollers in a position where force applied by each one of the first plurality of rollers on the first one or more pump segments has a direction that is not parallel to the first roller head's axis of rotation.