Rack and Pinion Implant Injection Device for Long Stroke Accuracy
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Solution Overview
Problem
Existing implant injection devices are inefficient for injecting very long implants or multiple implants due to limited actuation stroke and difficulty in maintaining injection accuracy over a long stroke, leading to potential errors and injuries.
Innovation Solution
An implant injection device equipped with a rack transmission mechanism that allows for easy actuation of a pushing rod over a long distance through a sliding button, providing tactile and audible indications to ensure precise injection and prevent over-deep insertion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a sliding button actuation is used, then the device is simple to operate, but the actuation stroke is insufficient for injecting very long implants or multiple implants
Solution Approach 1:
A rack transmission mechanism is introduced as an intermediary between the sliding button and the pushing rod. The rack translates the limited linear movement of the button into a longer linear displacement of the pushing rod through gear engagement, effectively multiplying the actuation stroke while maintaining the simplicity of button operation
Solution Approach 2:
The transmission mechanism changes the movement parameter from a short button stroke to a long pushing rod displacement. By engaging the rack with gear teeth, the system transforms the displacement magnitude while maintaining the operational simplicity of the original sliding button interface
2Length of moving object
If a long actuation stroke is used, then very long implants can be injected, but injection accuracy deteriorates and over-injection risk increases
Solution Approach 1:
The rack transmission mechanism provides inherent mechanical feedback through gear engagement. The user can feel the progression of injection through the gear teeth engagement, and the system naturally stops when the rack reaches the end of its travel, preventing over-injection while maintaining accuracy over the extended stroke
Solution Approach 2:
The gear teeth engagement creates periodic mechanical interactions that provide tactile feedback during the injection process. Each tooth engagement represents a discrete measurement unit, allowing the user to track injection progress accurately throughout the long stroke
3Device complexity
If a sliding button actuation is used, then the device structure is simple, but the user cannot stop the injection mid-stroke to redirect the needle
Solution Approach 1:
The rack transmission mechanism is designed to be dynamically controllable at any position during its stroke. The user can pause the injection at any point by simply stopping the button pressure, and the mechanism will hold its position due to gear engagement, allowing needle redirection before resuming or completing the injection
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
Enables easy and accurate injection of very long or multiple implants by multiplying user movement, improving handling and assembly, and providing clear indications to prevent accidental injection and ensure correct implant placement.
Implementation Method 1
the actuation means comprising a rack transmission mechanism
Data Source
AI summary
An implant injection device, including an injection needle, a receiver housing for receiving at least one implant, an injection mechanism, the injection mechanism including a pushing rod, arranged upstream from the at least one implant housed in the receiver housing, extending longitudinally and configured to push the at least one implant through the injection needle between an initial position and a final position in which the at least one implant is injected, a mechanism for actuation by a user, configured to actuate a displacement of the pushing rod from the initial position to the final position, the mechanism for actuation including a rack transmission mechanism.