Bone Milling Guide with Depth Determination Elements
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Solution Overview
Problem
Existing methods for milling bones during surgical procedures, such as knee arthroplasty, are complex and imprecise due to the challenges in positioning and orienting guiding pins, which can affect the accuracy of the recess created for implants.
Innovation Solution
A surgical kit comprising a milling tool with a central pin receiving bore and a positioning pin system that includes a pin depth determination element and a bone milling guide with a guide depth determination element, allowing for precise insertion and orientation of the milling tool to ensure accurate bone recess creation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If existing guiding pins and methods are used, then the milling tool can be guided during bone milling, but the positioning and orientation become complex and imprecise, relying heavily on surgeon skill
Solution Approach 1:
The bone milling guide is positioned and secured to the bone surface before inserting the positioning pin. The guide includes pre-formed guiding channels and depth determination elements that are ready to receive and position the pin at the correct depth and orientation, eliminating the need for real-time surgical judgment during pin insertion.
Solution Approach 2:
The bone milling guide acts as an intermediary tool between the surgeon and the positioning pin. It provides a physical framework with guiding channels and depth determination elements that automatically ensure correct pin positioning, reducing reliance on the surgeon's spatial judgment and manual skill.
2Manufacturing precision
If the positioning pin is inserted manually without depth guidance, then the procedure is simpler, but the insertion depth cannot be controlled accurately
Solution Approach 1:
The bone milling guide performs the self-service function of depth determination and control during pin insertion. The guide depth determination element physically contacts the pin at the correct depth, automatically stopping insertion at the precise location without requiring the surgeon to measure or judge the depth manually.
Solution Approach 2:
The manual mechanical process of measuring and judging pin insertion depth is replaced by a passive mechanical stop mechanism. The guide depth determination element serves as a physical stop that automatically defines the correct insertion depth through direct contact, eliminating the need for active depth measurement by the surgeon.
3Manufacturing precision
If the milling tool is guided by surgeon skill alone, then the equipment is simpler, but the orientation and positioning accuracy decrease
Solution Approach 1:
The guiding system is segmented into distinct functional components: the bone milling guide for positioning and orientation, the positioning pin for depth control, and the milling tool for bone removal. Each component has a specific function, and their modular design allows for precise control without requiring complex integration or sophisticated equipment.
Solution Approach 2:
The bone milling guide serves as an intermediary that translates simple surgical actions into precise milling tool orientation. It provides physical guiding channels and reference surfaces that automatically ensure correct tool alignment, replacing the need for complex active guidance systems or highly skilled manual manipulation.
Data Source
AI summary
A surgical kit and method for milling a bone, the surgical kit including: a rotatable milling tool including a receiving bore with an abutment portion; a positioning pin insertable in the bone for guiding the milling tool along a milling axis and towards the bone, the positioning pin including a pin shaft receivable in the receiving bore and a pin depth determination element, the pin shaft being abuttable against the abutment portion of the milling tool; and a bone milling guide positionable at a predetermined location on the bone for guiding the positioning pin when the positioning pin is inserted into the bone, the bone milling guide including a pin shaft guiding channel for receiving the pin shaft and a guide depth determination element cooperable with the pin depth determination element to provide an indication that the positioning pin is inserted in the bone at a predetermined depth.