Orthopedic Adapter With Adjustable Bidirectional Striking Force
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional orthopedic impactors lack the ability to adjust striking force for both insertion and removal of surgical instruments like broaches, leading to potential bone fractures due to excessive force and inconsistent space formation during hip replacement surgery.
Innovation Solution
An orthopedic adapter that includes a force adjustment mechanism with a rotatable outer ring, inner ring, and connection pin system, allowing for adjustable striking force through interlocking ratchet parts and elastic members to manage insertion and removal forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional impactor applies fixed striking force for broach insertion, then insertion process is simplified, but excessive force causes bone fracture and insufficient force fails to create proper space
Solution Approach 1:
The impactor employs a dynamic force adjustment mechanism where the striking force can be varied during the insertion process. The adapter includes an adjustable force transmission system that allows the operator to modify the impact intensity based on real-time surgical conditions, transforming a static tool into a dynamic one that adapts to changing requirements.
Solution Approach 2:
The invention changes the force parameter of the striking mechanism by incorporating an adjustable force transmission system. The adapter allows modification of the striking force magnitude through mechanical adjustment, enabling the operator to select appropriate force levels for different surgical stages and patient conditions, thus preventing both excessive and insufficient force application.
2Device complexity
If conventional impactor uses manual mallet for broach insertion, then device complexity is reduced, but impact size and direction become inconsistent leading to poor surgical outcomes
Solution Approach 1:
The invention replaces the manual mallet system with a mechanically controlled impactor that uses a motor-driven rotation mechanism coupled with a cam or eccentric structure. This substitution transforms uncontrolled manual impacts into mechanically regulated strikes, ensuring consistent force magnitude and directional alignment while maintaining relative structural simplicity.
Solution Approach 2:
The impactor integrates multiple functions into a single device: it combines rotation-to-linear-motion conversion, force regulation, directional control, and impact delivery in one unified tool. This multi-functionality eliminates the need for separate manual mallet operations while achieving precise and consistent impact application.
3Device complexity
If conventional adapter can only strike broach during insertion, then adapter structure is simplified, but adapter cannot be used for broach removal requiring additional tools
Solution Approach 1:
The adapter is designed with bidirectional force transmission capability, allowing it to function for both insertion and removal operations. The mechanical structure includes a reversible force application mechanism that can deliver striking force in both directions, enabling a single adapter to perform multiple surgical tasks that previously required separate tools.
Solution Approach 2:
The adapter incorporates a reversible mechanical mechanism that can invert the direction of force transmission. By rotating the adjustment mechanism in opposite directions, the adapter switches between delivering forward striking force for insertion and backward striking force for removal, effectively utilizing the same structure for opposite functions.
4Device complexity
If conventional adapter applies fixed striking force, then force transmission mechanism is simplified, but excessive force causes bone fracture and insufficient force creates abnormal space
Solution Approach 1:
The force transmission mechanism is designed to be dynamically adjustable rather than fixed. The adapter includes a variable force transmission system where the striking force can be modified during surgery based on bone density, patient anatomy, and surgical progress, ensuring reliable and consistent outcomes across different surgical scenarios.
Solution Approach 2:
The invention implements parameter change capability in the force transmission system by incorporating an adjustable mechanism that allows modification of the striking force magnitude. This enables the operator to optimize the force parameter for each specific surgical situation, preventing both bone fracture from excessive force and inadequate space creation from insufficient force.
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 adapter enables controlled striking force for safe and efficient insertion and removal of surgical instruments, reducing the risk of bone fractures and improving surgical outcomes by ensuring consistent force application.
Implementation Method 1
a striking part (3) that moves in a first direction while compressing a first spring (2) by rotation of the striking-part transfer part and then moves in a second direction opposite to the first direction by restoring force of the first spring
Implementation Method 2
a second striking part (6) that moves in a first direction while compressing a second spring (81) by rotation of the second striking-part transfer part and then moves in a second direction opposite to the first direction by restoring force of the second spring
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The orthopedic adapter of the present invention is detachably coupled to a rotary electric tool, and includes a tool coupling part receiving rotational force from the rotary electric tool, a shaft rotating in interlock with a rotation direction of the tool coupling part, a first striking-part transfer part rotating in interlock with the shaft only when the shaft rotates in a first direction, a first striking part capable of moving rearward by rotation of the first striking-part transfer part, a second striking-part transfer part rotating in interlock with the shaft only when the shaft rotates in a second direction, a second striking part capable of moving forward by rotation of the second striking-part transfer part, a force transmission part capable of moving rearward by contact with the first striking part and capable of moving forward by contact with the second striking part, and a force adjustment part capable of adjusting a force that the second striking part applies to the force transmission part by adjusting acceleration force by which the second striking part moves forward.