Orthopaedic Ratcheting Forceps One-Handed Switching Mechanism
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Solution Overview
Problem
Existing orthopaedic ratcheting forceps are difficult to manipulate with one hand, particularly in activating and securing the locking device, which compromises control and security during surgical procedures.
Innovation Solution
The design incorporates a pivotally mounted rod with catching elements and a leaf spring mechanism within the handles, allowing for easy switching between open and closed settings using handle movements, eliminating the need for additional buttons or levers, and ensuring secure jaw engagement through asymmetric tooth configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a reversible ratchet mechanism with three switching positions is used, then the forceps can move freely or in either direction, but the mechanism becomes difficult to manipulate with one hand
Solution Approach 1:
The patent extracts the ratchet mechanism from the handle structure and relocates it to the jaw assembly. This separation allows the handle to remain simple for one-handed operation while the jaw assembly contains the ratchet mechanism, resolving the contradiction between versatility and ease of operation.
Solution Approach 2:
The patent transitions from a handle-based ratchet mechanism to a jaw-based mechanism, changing the spatial dimension where the ratchet is located. This dimensional shift allows the ratchet to be operated through jaw movement rather than handle manipulation, enabling one-handed operation while maintaining ratchet functionality.
2Volume of moving object
If the ratcheting structure is placed within the handles, then the dimensions of the forceps are reduced, but the locking device becomes difficult to activate
Solution Approach 1:
The patent extracts the ratcheting structure from the handle and relocates it to the jaw assembly. This allows the handle to maintain compact dimensions while the jaw assembly contains the ratchet mechanism, making the locking device accessible and easy to activate through jaw movement.
Solution Approach 2:
The patent introduces the jaw assembly as an intermediary structure that houses the ratchet mechanism. This intermediary allows the ratchet to be activated through natural jaw closing motion rather than requiring separate handle manipulation, resolving the contradiction between compact dimensions and ease of operation.
3Reliability
If additional buttons or levers are added to activate the locking device, then the locking mechanism becomes more secure, but the device complexity increases
Solution Approach 1:
The patent implements a self-service locking mechanism where the jaw closing motion itself activates the ratchet and locks the jaw in position. No additional buttons or levers are needed - the jaw assembly's own movement performs the locking function, maintaining security while avoiding increased complexity.
Solution Approach 2:
The patent merges the jaw closing function with the ratchet activation function into a single integrated action. The same motion that closes the jaw also engages the ratchet teeth, combining multiple functions into one mechanism and avoiding the need for separate control components.
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
This design enhances the surgeon's control over the locking device, providing secure grip and easy manipulation of the forceps with one hand, ensuring stable jaw closure and efficient surgical handling.
Implementation Method 1
A leaf spring (7) pushes the rod (5) from the outer side of the handle (2) into the direction or towards the pivot point (3)
Implementation Method 2
ensuring secure jaw engagement through asymmetric tooth configurations
Data Source
AI summary
An orthopaedic ratcheting forceps, especially for fixation of fractures, comprises two handles, wherein a first catching element is mounted pivotally with one handle and wherein a complementary catching element is mounted in the other handle. The forceps can assume only two stable settings which can be switched with a single hand, one closed setting within which the jaws of the forceps can only be further closed and an open setting within which the handles of the forceps are freely movable so that the forceps can be opened as well as closed. In one handle a leaf spring is provided and biased between two mounting points which spring is mounted between abutting side walls within said handle. Furthermore a lever end connected with one of the catching elements engages the spring and through movement of the activation element the lever end and/or the spring is switchable between the closed setting and the open setting.