Compound Offset Handle for Hip Surgery Alignment
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Solution Overview
Problem
Traditional instrument handles used in hip replacement surgery, especially those designed for minimally invasive and anterior approaches, face challenges in aligning shaping instruments within the femoral canal without causing tissue damage and maintaining adequate linear force transmission, often resulting in misalignment or fracture of the femoral implant.
Innovation Solution
A surgical device with a handle configuration featuring a distal portion, transition portion, and proximal portion, where the transition portion is angled to accommodate a compound offset design, allowing the shaping instrument to be aligned and inserted through a small incision with minimal tissue interference, and a locking mechanism that enables easy detachment and reattachment from outside the incision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional straight or single-plane angled handles are used, then the handle structure is simple, but the shaping instrument cannot be properly aligned in the femoral canal during anterior approach surgery
Solution Approach 1:
The handle transitions from traditional straight or single-plane angled designs to a compound offset design incorporating bends in multiple dimensions (anterior-posterior, medial-lateral, and proximal-distal directions). This multi-dimensional offset configuration enables proper alignment of the shaping instrument with the femoral canal when accessed through an anterior surgical approach, resolving the alignment problem without oversimplifying the structure.
2Ease of operation
If dual offset handle design with three perpendicular bends is used, then the shaping instrument can reach the femoral medullary canal through MIS approach, but the handle interferes with surrounding tissue causing damage
Solution Approach 1:
The handle design distributes the offset configuration across multiple sections with different bend angles and directions rather than using extreme bends in fewer sections. The proximal, intermediate, and distal sections each contribute to the overall offset, allowing the instrument to reach the femoral medullary canal through minimally invasive approaches while reducing localized tissue interference and damage.
3Ease of operation
If dual offset handle design with severe bends is used, then the handle can reach the femoral canal through small incision, but linear impaction force is significantly lost due to torque creation
Solution Approach 1:
The compound offset handle distributes the necessary offset across multiple dimensional planes (anterior-posterior, medial-lateral, proximal-distal) rather than concentrating severe bends in one or two planes. This multi-dimensional distribution of offset reduces the severity of individual bends and minimizes torque generation, thereby preserving linear impaction force transmission from the handle to the shaping instrument while still enabling access through minimally invasive approaches.
4Object-affected harmful factors
If traditional handles are used with anterior approach, then the surgical approach is less traumatic, but the shaping instrument alignment causes fracture or misalignment of femoral implant
Solution Approach 1:
The compound offset handle configuration with bends in multiple dimensions (anterior-posterior, medial-lateral, and proximal-distal directions) enables proper alignment of the shaping instrument with the femoral canal when accessed through an anterior surgical approach. This multi-dimensional offset design maintains the benefits of the less traumatic anterior approach while ensuring accurate instrument alignment to prevent implant misalignment or fracture.
5Ease of operation
If extreme pressure is applied to traditional handles to achieve alignment, then the shaping instrument can be positioned, but severe tissue damage occurs from the pressure
Solution Approach 1:
The compound offset handle design achieves shaping instrument alignment through its geometric configuration with multiple bends distributed across different sections and directions, rather than requiring the application of extreme pressure. This structural approach to alignment eliminates the need for forceful manipulation that would cause tissue damage, allowing proper positioning through the handle's inherent offset geometry.
Data Source
Figure 1
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Figure 5~6
AI summary
A device for use on a patient during surgery including a distal portion (16), a transition portion (18), and a proximal portion (20) is disclosed. The distal portion is adapted to attach to an implement (14) having a proximal portion. The transition portion is angled toward an anterior direction and a medial direction with respect to the implement, the proximal portion of the handle being connected to the transition portion and extending in a proximal direction substantially parallel to the implement.