Bidirectional Ratchet Retractor for Precise Blade Positioning
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Solution Overview
Problem
Conventional retraction devices during surgical procedures lack efficient mechanisms for adjusting and securing retractor blades, providing unobstructed access and stability, which can hinder surgical precision and efficiency.
Innovation Solution
A retractor system with a jointed arm and bi-directional ratchet mechanism that allows for adjustable and secure positioning of retractor blades, utilizing a ratchet body, pinion, cam disc, and pawls to enable controlled movement and locking of the blades relative to a frame assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional retraction devices are used, then the surgeon can access internal organs, but the adjustment and securing mechanism is inefficient, hindering surgical precision and efficiency
Solution Approach 1:
The patent replaces conventional manual adjustment mechanisms with a ratchet-based mechanical system. The ratchet blade assembly includes a ratchet mechanism with teeth and a pawl that provides incremental, self-locking adjustment, eliminating the need for continuous manual holding and securing the blade position automatically through mechanical engagement.
Solution Approach 2:
The ratchet mechanism is designed to self-lock and self-secure the retractor blade at adjusted positions without requiring continuous external force or attention. Once the pawl engages with the ratchet teeth, the system maintains the position autonomously, allowing the surgical team to focus on the procedure rather than device adjustment.
2Manufacturing precision
If retractor blades are made adjustable for precise positioning, then surgical access is improved, but the device complexity increases
Solution Approach 1:
The retraction device is divided into modular components: the ratchet blade assembly, the ratchet mechanism, the pawl, and the frame assembly. This segmentation allows each component to be optimized independently for its specific function while maintaining overall system precision. The ratchet teeth are segmented into discrete positions, enabling precise incremental adjustment.
Solution Approach 2:
Instead of using complex motors or electronic controls to achieve precise positioning, the patent inverts the approach by using a simple mechanical ratchet system where precision is achieved through the geometry and spacing of the ratchet teeth themselves. The complexity is reduced by working backwards from the desired precision to a simple toothed engagement system.
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 system provides stable and adjustable retraction, allowing for precise surgical access and improved maneuverability of surgical tools, enhancing surgical precision and efficiency.
Implementation Method 1
a first pawl adapted to engage with the rack teeth to prevent movement of the ratchet body along the rack in a first direction and a second pawl adapted to engage with the rack teeth to prevent movement of the ratchet body along the rack in a second direction
Implementation Method 2
a pinion adapted to rotate about a longitudinal axis of the pinion and engage with the rack teeth
Implementation Method 3
a rack having a plurality of rack teeth extending along a longitudinal axis of the rack and transverse to the longitudinal axis of the pinion
Data Source
AI summary
A surgical device includes a ratchet having pawls biased to a locked position in which the pawls prevent movement of a ratchet body along a rack. A pinion and a cam disc of the ratchet cooperate to selectively release the pawls from the rack and impart ratcheted movement of the ratchet body along the rack. Rotation of a handle rotates the pinion and the cam disc. Due to such rotation, the cam disc periodically releases the pawls from the rack, and the pinion imparts movement of the ratchet body along the rack during the periodic release of the pawls.