High Tibial Osteotomy Spreader With Segmented Swinging Members
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Solution Overview
Problem
Conventional spreaders for high tibial osteotomy interfere with implant insertion and fail to maintain the cut in an open state, making it difficult to insert bone or artificial implants during the procedure.
Innovation Solution
A spreader with two pairs of swinging members connected by hinge parts and opening/closing mechanisms that allow for controlled opening and closing of the cut, distributing pressure to prevent damage and facilitating implant insertion by maintaining the cut in an open state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional spreader is used to open the cut, then the cut can be opened, but the spreader interferes with implant insertion and cannot maintain the cut in an open state
Solution Approach 1:
The spreader is divided into two pairs of swinging members that can be independently operated. One pair can be closed and removed while the other pair remains open to maintain the cut space, allowing implant insertion without interference from the spreader structure
Solution Approach 2:
The swinging members are designed to be dynamically adjustable between open and closed states through opening/closing mechanisms. This dynamic capability allows the spreader to transition from maintaining the cut open to being removed after implant insertion
2Adaptability or versatility
If the spreader is removed from the cut during insertion, then implant insertion becomes possible, but the cut closes and makes insertion difficult
Solution Approach 1:
The two pairs of swinging members can be independently controlled, allowing one pair to be closed and removed while the other pair remains in place to maintain the cut in an open state for implant insertion
3Ease of operation
If the cut is opened with a conventional spreader, then the cut opens, but the contact pressure on cut faces is concentrated and may damage the bone surfaces
Solution Approach 1:
The cutting force is distributed across two pairs of swinging members instead of a single concentrated point, spreading the contact pressure over a larger area of the cut faces to prevent bone surface damage
Solution Approach 2:
The swinging members can be dynamically adjusted to optimize contact distribution with the cut faces, ensuring even pressure distribution during the opening process
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 the secure insertion of implants by maintaining the cut open without damaging the bone surfaces, reducing contact pressure and allowing for efficient implant placement.
Implementation Method 1
two pairs of swinging members which are respectively connected in a relatively swingable manner by hinge parts disposed at the distal end
Implementation Method 2
two opening/closing mechanisms which open/close these two pairs of swinging members respectively about the axes of the hinge parts
Implementation Method 3
since the cut faces of the cut are pressed in wide areas by the two pairs of assembled swinging members, the contact pressure on the cut faces can be distributedly reduced
Data Source
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AI summary
To facilitate insertion of an implant while retaining a cut in an opened state. There is provided a spreader 1 for high tibial osteotomy to be inserted into a cut made in the deformed femur or tibia of a patient with knee osteoarthritis, and to open the cut so as to make a space that allows insertion of an implant, comprising: two pairs of swinging members 2a/2b and 3a/3b which are respectively connected in a relatively swingable manner by hinge parts 6 and 7 disposed at the distal end; and two opening/closing mechanisms 4 and 5 which open/close these two pairs of swinging members 2a/2b and 3a/3b respectively about the axes of the hinge parts 6 and 7, wherein the two pairs of swinging members 2a/2b and 3a/3b are detachably assembled in the axial directions of the hinge parts 6 and 7.