Syringe Pump Holding Device Damping Mechanism
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Solution Overview
Problem
Existing pump devices for administering medical fluids face challenges in securely fastening syringe barrels without causing damage, particularly to smaller syringes, due to clamping forces that may lead to cracking and air leakage.
Innovation Solution
A pump device with a damping device that includes a movable part connected to a shaft and a stationary part, utilizing a spring element for clamping force and a damping fluid to absorb kinetic energy, preventing damage by slowing down the holding member's rotation and ensuring secure fastening according to the EN 60601-2-24 Ed. 3 standard.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the holding member is designed to apply high clamping force to secure the syringe barrel, then the syringe barrel is securely fastened according to EN 60601-2-24 Ed. 3 standard, but the barrel skin may crack causing free flow condition
Solution Approach 1:
The damping device is integrated into the holding member to provide beforehand cushioning during the closing movement. The damping element (viscous damper, elastomeric material, or spring-damper combination) absorbs kinetic energy and reduces impact forces before they can damage the syringe barrel, while still allowing the holding member to apply sufficient clamping force to meet the 15 N tearing force requirement of EN 60601-2-24 Ed. 3 standard.
2Force
If the holding member is designed to apply sufficient clamping force to resist tearing force of 15 N, then the syringe barrel is held in place, but the clamping forces may cause crack in barrel skin
Solution Approach 1:
The damping device provides beforehand cushioning by absorbing kinetic energy during the closing movement, reducing peak impact forces on the barrel skin while maintaining the required clamping force of at least 15 N to prevent tearing. This allows the holding member to securely fasten the syringe without causing cracks that would lead to free flow conditions.
3Object-affected harmful factors
If a damping device is added to dampen rotational movement of the holding member, then damage to syringe barrel is prevented, but device complexity increases
Solution Approach 1:
The damping device is merged with the holding member structure, integrating the damping function into the existing holding mechanism. The damping element is positioned within the holding member's closing path, combining the securing function and damping function in a single integrated component rather than adding a separate external damping system.
Solution Approach 2:
The damping element acts as an intermediary between the holding member's closing movement and the syringe barrel. It mediates the force transmission by absorbing kinetic energy and reducing impact forces, protecting the barrel from damage while still allowing the holding member to apply the required clamping force.
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 solution provides a secure fastening of syringe barrels while preventing damage by absorbing kinetic energy, ensuring that the clamping force meets the standard requirements without causing cracks, thus reducing the risk of free flow conditions.
Implementation Method 1
a damping device (14) comprising a movable part (140) connected to the shaft (130) and rotatable together with the shaft (130) and a stationary part (141) fixed with respect to the stationary section (101) of the holding device (10), a rotational movement of the movable part (140) with respect to the stationary part (141) providing for a damping of the movement of the holding member (11)
Data Source
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AI summary
A pump device (1) for administering a medical fluid to a patient comprises a holding device (10) for receiving a syringe barrel (20) of a syringe (2), the holding device (10) comprising a stationary section (101) and a holding member (11) movable with respect to the stationary section (101) between an opened position and a closed position, wherein the holding member (11) is configured to secure, in the closed position, the syringe barrel (20) of a syringe (2) received on the holding device (10) with respect to the stationary section (101). A shaft (130) is coupled to the holding member (11), the shaft (130) being constituted to rotate during a movement of the holding member (11). Herein, a damping device (14) comprises a movable part (140) connected to the shaft (130) and rotatable together with the shaft (130) and a stationary part (141) fixed with respect to the stationary section (101) of the holding device (10), a rotational movement of the movable part (140) with respect to the stationary part (141) providing for a damping of the movement of the holding member (11). In this way a pump device for administering a medical fluid to a patient is provided which may provide for a secure fastening of a syringe barrel and at the same time helps to avoid a damaging of in particular smaller syringes by clamping forces of the holding member.