Coracoid Transfer Instrument Geometry for Safer Scapular Neck Fixation
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Solution Overview
Problem
Conventional coracoid process transfer surgery faces challenges in capturing the coracoid process in body fluid and risks damaging the neurovascular system due to pinching during transplantation.
Innovation Solution
A surgical instrument with a shaft and an inclined part at an angle of 95° to 115°, equipped with a notch or through-hole, facilitates stable attachment to the coracoid process and minimizes neurovascular damage by guiding the process into proximity with the scapular neck.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional arthroscopic coracoid process transfer surgery is performed using a cylinder to capture the coracoid process, then the surgery can be performed arthroscopically, but it becomes extremely difficult to capture the floating coracoid process and the operation time becomes very long
Solution Approach 1:
The surgical instrument acts as an intermediary device between the surgeon and the coracoid process. It includes a holder that receives the coracoid process and a guide wire that passes through the coracoid process to facilitate secure attachment. This intermediary mechanism solves the problem of difficult capture by providing a structured approach rather than direct manual manipulation in body fluid.
Solution Approach 2:
The instrument performs preliminary actions by first inserting the guide wire through the coracoid process before attempting to secure it in the holder. This preliminary positioning and attachment action simplifies the subsequent capture and transfer operations, reducing the overall time and difficulty of the procedure.
2Productivity
If the coracoid process is transplanted by moving it into proximity with the scapular neck, then the transplantation can be completed, but the neurovascular system may be pinched and damaged
Solution Approach 1:
The instrument provides visual feedback through the arthroscope by incorporating reflective markers or using the instrument's structure to create visible references. This allows the surgeon to monitor the position of the coracoid process and surrounding structures in real-time, providing feedback that prevents excessive movement or pinching of neurovascular structures during the transplantation process.
3Illumination intensity
If direct vision surgery is used for coracoid process transfer, then the surgery can be performed with good visibility, but muscle invasion and postoperative joint contracture occur
Solution Approach 1:
The invention replaces the direct mechanical visualization approach (direct vision surgery requiring large incisions and muscle displacement) with an optical system (arthroscope). The arthroscope transmits visual information through optical fibers or lenses, allowing the surgeon to see the surgical field through small portals without directly exposing and manipulating muscles, thereby avoiding muscle invasion and joint contracture.
Data Source
AI summary
Provided is a surgical instrument that can easily bring the coracoid process into proximity with the scapular neck. A surgical instrument 1 of the present invention includes a shaft 2 extending in the first direction, and an inclined part 3 extending from the tip of the shaft 2 in the second direction. The second direction, in which the inclined part 3 extends, is inclined at an angle of α in a range of 95° or more and 115° or less to the first direction, in which the shaft 2 extends, and the inclined part 3 includes on the outer edge thereof a notch 10 through which a screw is passed.