Patient-Specific Shoulder Implant Impactor with Bone Perforating Protrusions
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional surgical methods for shoulder prosthesis implantation require extensive instrumentation and often result in bone loss due to the difficulty in conforming cortical bone to implants, leading to inefficient secondary anchoring relying heavily on mechanical fixation rather than bone growth.
Innovation Solution
A surgical instrumentation assembly featuring a patient-specific impacting device with protrusions that perforate the cortical bone to create channels for cancellous bone growth, combined with a porous implant surface to enhance bone integration, allowing for improved secondary anchoring through bone growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional base plates are used for shoulder prosthesis implantation, then mechanical anchoring through screws and posts can be achieved, but secondary anchoring through bone growth is inefficient because cortical bone does not facilitate bone growth
Solution Approach 1:
The impacting device creates channels in the cortical bone before implant insertion, preparing the bone structure in advance to facilitate subsequent bone growth into the implant. This preliminary action modifies the cortical bone to remove its resistance to bone growth, enabling effective secondary anchoring.
Solution Approach 2:
The implant incorporates a porous structure that allows bone tissue to grow into and through the material. This porous design transforms the cortical bone's resistance into an opportunity for bone ingrowth, creating strong biological anchoring that complements the mechanical fixation.
2Manufacturing precision
If extensive reaming is performed to conform cortical bone to implants, then implant fit can be improved, but bone loss occurs and special bone augments are required
Solution Approach 1:
The impacting device features multiple protrusions that create discrete channels in the cortical bone rather than requiring extensive continuous reaming. This segmented approach achieves the necessary bone modification while preserving more of the original bone structure, eliminating the need for bone augments.
Solution Approach 2:
Instead of uniformly reaming the entire bone surface, the impacting device applies localized modifications only where channels are needed for bone growth. This local quality approach achieves implant conformance precisely where required while minimizing overall bone removal.
3Measurement precision
If patient-specific implants are directly fixed on cortical bone, then implant positioning can be optimized, but secondary anchoring through bone growth becomes much less efficient
Solution Approach 1:
The patient-specific impacting device creates channels in the cortical bone before implant fixation, preparing the bone structure in advance to enable bone growth into the implant. This preliminary channel creation resolves the contradiction by maintaining precise positioning while enabling effective secondary anchoring.
Solution Approach 2:
The impacting device acts as an intermediary between the patient-specific implant and the cortical bone, modifying the bone structure to facilitate bone growth. This intermediary action enables both precise implant positioning and effective secondary anchoring through bone growth.
4Adaptability or versatility
If conventional instrumentation is used for shoulder prosthesis implantation, then standard procedures can be followed, but much instrumentation and time are required
Solution Approach 1:
The impacting device combines multiple functions into a single instrument: it creates channels in the cortical bone, prepares the implant surface, and facilitates bone growth all in one step. This merging of functions reduces the number of separate instrumentation steps required, decreasing surgical time while maintaining procedure effectiveness.
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
The solution facilitates better anchoring of shoulder implants by promoting bone growth into the implant's porous surface, reducing reliance on mechanical fixation and enhancing the stability of the implant in the scapula.
Implementation Method 1
protrusions adapted to perforate the cortical bone of the scapula upon impact of the impacting device against the scapula by a one-sided translation movement
Implementation Method 2
The preparation of the bone requires reaming, which is difficult to implement due to the exposition of the bone, and several types of implants require extensive reaming resulting in bone loss, or require special bone augments and corresponding instrumentations to provide enough support for the base plates of the implant
Data Source
AI summary
This surgical instrumentation assembly is for positioning a shoulder prosthesis, the shoulder prosthesis comprising a patient-specific shoulder implant adapted to fit onto a glenoid cavity of the scapula of a patient. The assembly comprises a patient-specific impacting device having an underside surface congruent with the glenoid cavity of the scapula of the patient, said underside surface being provided with protrusions adapted to perforate the cortical bone of the scapula upon impact of the impacting device against the scapula by a one-sided translation movement.