Surgical Tool Retraction Mechanism Linear Guide
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Solution Overview
Problem
Existing surgical device retraction mechanisms apply a non-linear load to surgical sites during retraction, which can cause damage, especially in delicate areas like the eyeball.
Innovation Solution
A surgical device retracting mechanism featuring a holder, a guiding member, a locking member, and a retracting unit with a tension spring, compression spring, and solenoid to ensure linear retraction and reduced load, allowing for quick and controlled withdrawal of devices like endoscopes from surgical sites.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the endoscope is retracted by moving the arm, then the endoscope can be retracted from the eyeball, but a non-linear load is applied to the eyeball during retraction
Solution Approach 1:
The retraction mechanism is segmented into independent functional components: a holder for the endoscope, a guiding member for linear movement, a locking member for position fixation, and a retracting unit for controlled release. This segmentation allows the retraction function to be isolated from arm movement, enabling linear retraction that reduces harmful non-linear loads on the eyeball.
Solution Approach 2:
A guiding member is introduced as an intermediary component between the holder and the arm mechanism. This guiding member constrains the holder to move only along a linear path parallel to the insertion direction, mediating the retraction process to eliminate non-linear movements and reduce harmful loads on the eyeball.
2Reliability
If a locking mechanism is used to hold the surgical device, then the device can be securely positioned, but the retraction control becomes more complex
Solution Approach 1:
The locking member is designed to automatically engage with the holder at predetermined positions during insertion, providing self-locking functionality without requiring complex external control. The retracting unit simply needs to apply a releasing force to disengage the locking member, simplifying the retraction control while maintaining reliable positioning during the procedure.
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 mechanism enables linear retraction of surgical devices, reducing the load on surgical sites and ensuring quick withdrawal without complex control, even in emergencies or power failures, while maintaining flexibility in component layout.
Implementation Method 1
a first force generating member (tension spring) for generating a first force in a retracting direction of the holder in a state in which the holder is locked
Implementation Method 2
a second force generating member (compression spring) for generating a second force for releasing the locking state of the locking member
Implementation Method 3
a third force generating member (solenoid) for maintaining the locking state of the locking member against the second force
Data Source
Figure 1
Figure 2
AI summary
A surgical device retracting mechanism (10) includes a holder (14) for holding an endoscope (12), a guiding member (16) for guiding the holder (14) to linearly advance and retract, a locking member (20) for locking the holder (14) in a state in which the endoscope (12) is inserted in an eyeball (18), and a retracting unit (22) for releasing the locking state of the locking member 20 and retracting the holder (14) in accordance with a signal from outside the retracting unit (22).