Oscillating Rasping Surface for Knee Arthroplasty Bone Resection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current surgical bone removal systems lack precision and flexibility during knee replacement surgeries, making it difficult for surgeons to achieve accurate bone resections and proper gap balancing for implant placement.
Innovation Solution
A bone removing device with a gearing mechanism, oscillating rasping surfaces, and a manually adjustable height system that translates rotational motion into oscillating linear motion, allowing for precise and fine-tuned bone resections, including a planetary drive system and beveled gears to increase revolutions per minute and adjust the distance between rasping surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional bone removal system is used, then the surgical procedure can be completed, but the precision and accuracy of bone resections are insufficient
Solution Approach 1:
The device incorporates an oscillating mechanism that transforms rotational motion into reciprocating linear motion, allowing the rasping surface to oscillate back and forth. This dynamic motion enables precise bone resection by allowing the surgeon to control the depth and extent of bone removal through the oscillation amplitude and frequency, thereby improving manufacturing precision without excessive complexity
Solution Approach 2:
The bone removal device is divided into distinct functional modules: a rotational component (surgical instrument), a transmission system (gearing mechanism including planetary gears and beveled gears), and an oscillating component (rasping surface). This segmentation allows each module to be optimized independently for its specific function while maintaining overall system manageability, resolving the contradiction between precision and complexity
2Adaptability or versatility
If the distance between rasping surfaces is fixed, then the device structure is simple, but the surgeon cannot fine-tune adjustments for gap balancing
Solution Approach 1:
The device features a manually adjustable height mechanism that allows the distance between the non-oscillating surface and oscillating rasping surface to be dynamically changed during surgery. This adjustability enables surgeons to fine-tune bone resection depth for proper gap balancing, while the manual adjustment mechanism keeps the device complexity manageable by avoiding automated systems
Solution Approach 2:
The device allows changing the critical parameter of rasping surface distance through manual adjustment. By providing a mechanism to vary this distance, the device achieves adaptability for different surgical requirements and gap balancing needs without requiring a completely different device for each scenario, thus improving versatility without proportionally increasing complexity
3Productivity
If the rotational speed of the surgical instrument is low, then the device is simple, but the bone resection efficiency is insufficient
Solution Approach 1:
The device combines multiple gear systems (planetary gears and beveled gears) into a single integrated transmission mechanism. This merging of gear types allows the device to achieve high rotational speed multiplication (increasing RPMs) while maintaining a compact and relatively simple overall structure. The combined gearing system efficiently transmits and amplifies rotational motion without requiring separate, complex subsystems
Solution Approach 2:
The oscillating mechanism converts continuous rotational motion into periodic reciprocating motion of the rasping surface. This periodic action increases bone removal efficiency by creating a back-and-forth cutting motion that removes bone more effectively than continuous rotation alone, while the gearing mechanism maintains the necessary rotational speed to drive this periodic action
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
Enables surgeons to perform precise and adjustable bone resections, facilitating proper gap balancing and implant placement, improving the accuracy and effectiveness of knee arthroplasty procedures.
Implementation Method 1
the bone removing device further comprises an intermediate housing. The intermediate housing containing a vertical beveled gear and a horizontal beveled gear. The vertical beveled gear and the horizontal beveled gear are configured to translate a rotational motion into an oscillating linear motion
Implementation Method 2
The vertical beveled gear and the horizontal beveled gear are configured to translate a rotational motion into an oscillating linear motion of the first oscillating rasping surface
Implementation Method 3
the geared teeth are configured to operate a rack and pinion mechanism so as to spread the distance between the non-oscillating surface and the oscillating rasping surface
Data Source
AI summary
A bone removing device. The device includes a gearing mechanism and a bone removing device housing containing the gearing mechanism. A first non-oscillating surface is operably connected to the gearing mechanism and a first oscillating rasping surface is operably connected to the gearing mechanism. When the gearing mechanism of the bone removing device is operated, the first oscillating rasping surface is oscillated. The first non-oscillating surface may comprise a rasping surface.