Orthopaedic Disassembly Tool Spindle Rod Mechanism
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Solution Overview
Problem
Current orthopaedic surgical instruments lack efficient methods for disassembling and assembling implantable knee prostheses, particularly in scenarios where secure fastening mechanisms like taper fits and secondary retention devices are used, making it difficult to access and remove components without damaging the prosthetic or bone structures.
Innovation Solution
The development of a surgical instrument comprising a main component, a rod component, and a spindle component, along with a method that involves threading the spindle component to apply force and disengage prosthetic components, allowing for the removal of fasteners and retention devices, facilitating the disassembly and assembly of orthopaedic prostheses by leveraging a disassembly tool with a main component, rod component, and spindle component.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If secure fastening mechanisms like taper fits and secondary retention devices are used to secure prosthetic components, then the reliability and stability of the implant are improved, but the difficulty of disassembly and removal of components increases
Solution Approach 1:
The patent introduces a disassembly tool as an intermediary device that mediates between the securely fastened prosthetic components and the surgeon. This tool includes a rod component that fits through the prosthetic components and a spindle component with threaded engagement that interfaces with the secondary retention device, allowing controlled disassembly without damaging the secure fastening mechanisms or the bone structures.
Solution Approach 2:
The disassembly tool is segmented into multiple components: a main component with a rod, a spindle component with threaded engagement, and a handle component. This segmentation allows each part to perform a specific function - the rod transmits force, the spindle engages with retention devices, and the handle provides leverage - making the overall disassembly process manageable and controlled.
2Productivity
If force is applied to disengage prosthetic components from bone structures, then the productivity of the surgical procedure is improved, but the risk of damaging the bone or prosthetic increases
Solution Approach 1:
The disassembly tool is designed to preliminarily engage with the prosthetic components before force application. The rod component is inserted through the prosthetic components and positioned against the bone interface, and the spindle component is threaded into engagement with the secondary retention device beforehand. This preliminary positioning ensures that subsequent force application is directed precisely at the fastening mechanisms, not the bone or prosthetic structures.
Solution Approach 2:
The disassembly tool acts as an intermediary that distributes and directs force through the prosthetic components. Rather than applying force directly to the bone-prosthetic interface, the tool transmits controlled force through the rod and spindle mechanisms, which gradually work loose the fastening mechanisms without concentrating stress on vulnerable bone or prosthetic areas.
3Ease of operation
If specialized disassembly tools with multiple components are used, then the ease of operation for controlled disassembly is improved, but the device complexity increases
Solution Approach 1:
The disassembly tool merges multiple functions into a single integrated instrument. The main component combines the rod (for force transmission), the spindle (for threaded engagement with retention devices), and the handle (for applying torque) into one cohesive tool that can be manipulated as a single unit during the disassembly procedure.
Solution Approach 2:
The disassembly tool is designed with universal applicability to different prosthetic component configurations. The rod component can accommodate various prosthetic geometries, and the spindle component's threaded engagement mechanism can interface with different secondary retention device types, making the tool versatile across multiple surgical scenarios.
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
This solution enables secure and controlled disassembly and assembly of orthopaedic prostheses, ensuring that the prosthetic components can be removed without damaging the bone or prosthetic, thereby maintaining the integrity of the implant and facilitating surgical procedures.
Implementation Method 1
The spindle component includes a threaded body configured to thread into the housing to move the rod component along the longitudinal axis
Data Source
AI summary
An orthopaedic surgical instrument for use in disassembling an orthopaedic prosthesis includes a main component, a rod, and a spindle. The main component has a housing and an elongated body extending from the housing with a passageway is defined in the elongated body. The rod has an elongated shaft, with a greater length than the elongated body, extending from the head of the rod and configured to pass through the main component. The spindle threads into the housing to move the rod along a longitudinal axis.