Cable Passer With Varying Groove Angles For Bone Cerclage
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Solution Overview
Problem
Conventional cable passer devices for cerclage wire placement in orthopedic surgery face challenges such as cable collision with the channel's inner surface due to uniform angles and widths, requiring unnecessary tissue dissection and damage during cable passage.
Innovation Solution
A cable passer device with a cannulated body featuring a continuous groove extending from the proximal to the distal end, with varying angles and a constant radius, facilitating unimpeded movement of the cerclage cable and minimizing tissue exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a uniform channel with constant width and angle is used, then the device structure is simple, but the cable collides with the inner surface requiring excessive tissue dissection
Solution Approach 1:
The channel cross-section is designed with non-uniform properties: the width varies along the length (narrower at proximal end, wider at distal end) and the angle varies (steeper proximally, shallower distally). This local variation in geometric quality allows the cable to follow the channel curvature smoothly without collision, eliminating the need for excessive tissue dissection while maintaining manufacturing feasibility
Solution Approach 2:
The channel is designed with a curved arcuate portion that follows a circular path around the bone. The varying width and angle create a smoothly curved pathway that guides the cable around the bone contour, preventing cable collision with the channel walls and reducing harmful tissue dissection effects
2Ease of manufacture
If the cable is passed through a uniform channel, then the device is easier to manufacture, but the cable cannot pass smoothly requiring device movement that damages tissue
Solution Approach 1:
The channel geometry is locally optimized with varying width and angle along its length. The proximal end has narrower width and steeper angle to guide cable entry, while the distal end has wider width and shallower angle to facilitate cable exit. This local geometric variation enables smooth cable passage without requiring surgeon manipulation that would damage tissue
Solution Approach 2:
The channel design creates a dynamic cable passage experience where the cable naturally follows the varying geometric constraints. The changing width and angle progressively guide the cable through the curved path, transforming a static uniform channel into a dynamic adaptive pathway that accommodates cable movement without tissue damage
3Ease of operation
If a beaded cable with locking sleeve is used, then the tightening process is simpler, but broader exposure of bone and tissue is required
Solution Approach 1:
The locking sleeve and bead are nested within the channel structure. The channel's varying width is designed to accommodate the locking mechanism components, with the narrower proximal portion allowing the sleeve to pass through while the wider distal portion accommodates the bead. This nesting allows the locking mechanism to function within a smaller surgical exposure area
Solution Approach 2:
The channel provides a three-dimensional pathway that allows the locking sleeve and bead to be positioned and secured without requiring broad lateral exposure. The curved arcuate portion of the channel enables the locking mechanism to be engaged in the depth dimension rather than requiring wide surface exposure, reducing the surgical incision size
Data Source
AI summary
The present invention discloses a cable passer device and method for placement of a cerclage cable for internal fixation of bone. The device comprises a cannulated body including a proximal end, a straight portion, an arcuate portion, and a distal end. The straight portion extends from the proximal end, and the arcuate portion extends from the straight portion and ends at the distal end of the cannulated body. A continuous groove extends from the proximal end to the distal end through the straight portion and the arcuate portion of the cannulated body. The groove extends radially along an internal diameter of the cannulated body. An opening of the groove facilitates to receive the cerclage cable therein. The width of the opening remains the same throughout an entire length of the continuous groove. The groove includes varying angle to facilitate unimpeded movement of cerclage cable therethrough.