Orthopedic Fixator Clamp With Ratcheted Tool-Free Tightening
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Solution Overview
Problem
Existing external fixators suffer from imprecise tightening of clamps, requiring tools for adjustment, and are prone to instability due to loose clamps when encountering objects, especially in austere environments.
Innovation Solution
A universal clamp apparatus with a threaded mechanism and ergonomically designed knobs that provide tool-free, precise tightening and stability through a ratcheting and securing mechanism, utilizing collapsible levers and radial ratchet grooves for incremental rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a collapsible handle with cam mechanism is used to secure clamps, then the clamp can be quickly secured, but the tightening precision is imprecise and the clamp cannot be readjusted
Solution Approach 1:
The clamp mechanism transitions from a static cam-based quick-release system to a dynamic threaded system with a knob that allows continuous adjustment. The threaded engagement provides incremental motion control, enabling the user to precisely adjust the clamp tightness while maintaining quick operation capability through the knob's rotational movement.
Solution Approach 2:
The invention changes the tightening parameter control from discrete cam positions to continuous threaded rotation. The knob threaded into the clamp body allows fine-tuning of the compression force applied to the bone pin, providing precise control over the tightening parameter that was previously impossible with the cam mechanism.
2Ease of operation
If a collapsible handle is used for securing clamps, then operation is simplified, but stability is compromised when the handle catches on objects
Solution Approach 1:
The invention removes the collapsible handle component entirely from the design. Instead, a simple knob with threaded engagement is used to secure the clamp. This extraction of the problematic handle element eliminates the risk of it catching on objects while maintaining ease of operation through the knob's simple rotational interface.
Solution Approach 2:
The threaded knob mechanism is self-retaining and does not require collapsible moving parts that can catch on objects. The threads inherently provide mechanical advantage and self-locking properties, making the clamp stable and reliable without the need for complex handle mechanisms that compromise reliability.
3Measurement precision
If progressive tightening with compressive screw is used, then tightening precision is improved, but tool requirement increases device complexity
Solution Approach 1:
The invention merges the tightening mechanism directly into the clamp body by threading the knob into the clamp. This integration eliminates the need for separate tools or external screw mechanisms, reducing device complexity while maintaining progressive tightening capability through the threaded engagement of the knob with the clamp body.
Solution Approach 2:
The knob serves multiple functions: it provides progressive tightening through threaded engagement, acts as a lever for mechanical advantage during tightening, and can be easily manipulated by hand without requiring specialized tools. This multi-functionality reduces the need for additional tools and simplifies the overall device.
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 tool-free, precise tightening and enhanced stability of bone pins and frame rods, reducing the risk of clamp loosening and ensuring secure fixation without the need for additional tools.
Implementation Method 1
A threaded mechanism, for example, a clamp screw, extends through and connects the first and second pin/rod clamps
Implementation Method 2
Planar sides of the pin/rod clamps that are contiguous each have radial ratchet grooves that are in mating engagement and that implement a ratcheting and securing mechanism so that the rotation of the pin/rod clamps relative to each other occurs in discrete incremental rotational steps
Implementation Method 3
An ergonomically designed knob having at least one collapsible or non-collapsible turn lever that acts as a torque amplifier when rotated
Data Source
AI summary
A universal clamp apparatus for orthopedic exterior fixators is disclosed. Preferably, the universal clamp apparatus has two pin/rod clamps, each having seating grooves for attaching to a frame rod associated with a frame of the fixator and/or a bone pin for implantation in a bone fragment. A clamp screw extends through and connects the first and second pin/rod clamps. An ergonomically designed knob having at least one collapsible or non-collapsible turn lever acts as a torque amplifier when rotated by hand without tools to tighten and untighten the pin/rod clamps to the frame rod and/or bone pin by movement along the clamp screw. The pin/rod clamps have planar sides that are contiguous and have radial ratchet grooves that are in mating engagement and provide a ratcheting mechanism so that the rotation of the pin/rod clamps relative to each other occurs in incremental rotational steps.