Double-Convex Broach Handle for Femoral Canal Access
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Solution Overview
Problem
Current surgical devices for preparing a femoral canal in hip arthroplasty require extensive incisions and rotations of the femur, leading to potential trauma, contamination, and longer surgical times due to their straight design that interferes with the patient's anatomy.
Innovation Solution
A broach handle with a double convex geometry that allows the rasp to be inserted into the femur without extracting it from its natural seat, minimizing incisions and reducing interaction with the abdomen and pelvis, featuring a handle design with specific angles and a skew portion to facilitate easier access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a straight handle design is used for the surgical device, then the device structure is simple, but the device interferes with the patient's abdomen and pelvis, requiring extensive incisions and femur rotation
Solution Approach 1:
The handle is designed with a curved geometry instead of a straight configuration. The curve allows the handle to navigate around the patient's anatomy (abdomen and pelvis) to reach the femoral canal without requiring extensive incisions or femur rotation, thus resolving the contradiction between structural simplicity and operational ease
Solution Approach 2:
The curved handle introduces a spatial dimension change, allowing the device to access the femoral canal through a different trajectory that avoids interference with the abdomen and pelvis, eliminating the need for extreme femur rotation and extensive soft tissue dissection
2Ease of operation
If the femur is rotated and extracted from its natural seat to access the femoral canal, then the surgeon has better visibility and access, but the patient suffers from trauma, contamination risk, and longer surgical time
Solution Approach 1:
The curved handle design enables the surgeon to access and visualize the femoral canal without requiring extreme rotation or extraction of the femur from its natural seat, thereby maintaining better visibility and access while minimizing trauma and contamination risk to the patient
3Manufacturing precision
If extensive incisions and femur rotation are performed to insert the rasp, then the rasp can be properly positioned, but the surgical time increases and patient stress increases
Solution Approach 1:
The curved handle allows for accurate rasp insertion into the femoral canal through a more direct and less invasive trajectory, eliminating the need for extensive incisions and femur rotation, thereby reducing surgical time while maintaining insertion accuracy
Solution Approach 2:
The curved handle design is pre-configured to accommodate the anatomical constraints, allowing the rasp to be inserted accurately without requiring time-consuming manual manipulation, femur rotation, or extensive exposure steps
Data Source
AI summary
A broach handle for a rasp includes a proximal part extending along a first axis between a first portion of the handle and a second portion of the handle, and a proximal part extending partially along a second axis between a third portion of the handle, connected to the second portion, and a fourth portion of the handle, and partially along a third axis between a fifth portion of the handle, connected to the fourth portion, and a sixth portion of the handle connectable to a rasp. The sixth portion of the handle has a connection surface for connecting to the rasp having a normal extending along a normal axis defining a connection axis between the handle and the rasp. A first convex angle is defined between the first axis and the second axis, and a second convex angle is defined between the third axis and the normal axis.