Robotic Bone Burring for Cementless Implant Stability
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Solution Overview
Problem
Cementless orthopedic implants face challenges in achieving stable bone ingrowth due to surface roughness caused by conventional burring devices, which inhibit permanent fixation.
Innovation Solution
A computer-assisted surgical system utilizing advanced robotic and imaging technologies to precisely control burring devices, ensuring a smooth bone surface for cementless implantation by adjusting settings and using multiple sensor systems for real-time feedback and precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional burring device is used for bone resection, then cutting versatility is improved, but surface roughness increases which inhibits bone ingrowth
Solution Approach 1:
The bone resection process is divided into multiple sequential stages: initial bone removal with a saw, followed by controlled burring with specific parameters, and final surface finishing with specialized instruments. This segmentation allows each stage to optimize for its specific function, achieving both versatility and surface quality.
Solution Approach 2:
The bone surface is prepared in advance through controlled burring with predetermined parameters before implant placement. The system pre-establishes the optimal surface characteristics by adjusting burring depth, speed, and path planning ahead of time, ensuring the surface is ready for bone ingrowth before the implant is inserted.
2Adaptability or versatility
If a burring device is used for bone resection, then cutting flexibility is improved, but implant stability deteriorates due to increased surface roughness
Solution Approach 1:
The burring device operates with dynamically adjusted parameters including variable rotational speed, controlled feed rate, and adaptive depth control. The system continuously monitors and adjusts these parameters during the procedure to maintain optimal surface quality while preserving cutting flexibility for different bone geometries.
Solution Approach 2:
The system changes multiple parameters simultaneously to resolve the contradiction: reducing burring depth to superficial levels, lowering rotational speed to minimize surface disruption, and modifying the burr path pattern to create a controlled micro-roughness that promotes bone ingrowth rather than inhibiting it.
3Ease of operation
If conventional bone preparation methods are used, then procedural simplicity is maintained, but bone surface quality deteriorates
Solution Approach 1:
The robotic system incorporates real-time feedback through sensors that monitor bone removal depth, surface characteristics, and tool position. This feedback loop automatically adjusts burring parameters and provides haptic or visual cues to the surgeon, maintaining simple operation while achieving precise surface quality control through closed-loop control.
Solution Approach 2:
The system replaces manual mechanical control with robotic automation that uses computer vision and sensor data to control the burring device. This substitution maintains procedural simplicity for the surgeon while achieving superior surface quality through automated precision control and real-time imaging guidance.
Data Source
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AI summary
Methods and systems for preparing a bone for a cementless joint implant are described. A first bone removal operation is performed using a burring device that has a first plurality of settings. The settings for the burring device are adjusted to a second plurality of settings, and a second bone removal operation is performed using the burring device. The adjustment to the settings may allow a surgeon to perform bulk bone removal in the first instance and fine bone removal in the second instance. The process of adjusting and performing subsequent bone removal operations may be performed any number of times during the bone preparation process. The adjustments to the settings may be received automatically from a computer-assisted surgical system, manually entered by a medical professional, or a combination of the two.