Rotatable Retraction Assembly with Bone Anchorage
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Solution Overview
Problem
Conventional self-retaining retractors used in surgery, particularly in anterior spinal surgery, face challenges such as excessive retraction forces, slippage, and difficulty in maintaining position, leading to tissue injury and inefficiency due to lack of secure anchorage and rotational adjustment capabilities.
Innovation Solution
The development of a distraction and retraction assembly that employs bone fixation with adjustable and rotatable retractor blades, utilizing distraction pins and cooperating sleeves to optimize mechanical advantage and efficiency, allowing secure anchorage and variable rotational adjustment to resist unwanted pull-out and minimize tissue trauma.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional self-retaining retractors are used with fixed blades, then the device structure is simple, but the retraction forces are excessive and cause tissue injury
Solution Approach 1:
The retractor blades are made rotatable relative to the distraction pins, allowing dynamic adjustment of blade orientation and retraction force distribution. This enables the surgeon to optimize retraction forces in real-time, reducing excessive forces on vulnerable tissues while maintaining adequate exposure.
Solution Approach 2:
The retractor system is segmented into distinct components: distraction pins anchored in bone, rotatable blade assemblies, and connection mechanisms. This segmentation allows independent optimization of each component, with blades that can rotate to distribute forces more evenly across tissues.
2Reliability
If conventional retractors apply retraction forces from the top outside the wound, then the device structure is simple, but the retraction forces cause slippage and unwanted pull-out
Solution Approach 1:
The retraction force application is moved from a superior (top) position outside the wound to an inferior (bottom) position at the distal end of the blades within the wound. This dimensional change in force application location creates a more favorable force vector that resists slippage and unwanted pull-out, improving retractor stability.
3Productivity
If retractors are used without rotational adjustment capability, then the device structure is simple, but the retraction efficiency is reduced and operator fatigue increases
Solution Approach 1:
The blade assemblies are designed with rotational capability relative to the distraction pins, enabling dynamic adjustment of blade orientation. This allows the surgeon to optimize retraction efficiency for different surgical scenarios and maintain effectiveness throughout the procedure, reducing operator fatigue.
4Reliability
If retractors are applied without secure bone fixation, then the device structure is simple, but the retraction forces cause slippage and require frequent repositioning
Solution Approach 1:
The retractor system merges distraction pin fixation with blade retraction functions. The distraction pins provide secure anchorage in the bone, while the blades rotate on these pins to perform retraction. This combination ensures stable positioning while enabling effective tissue retraction without slippage.
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 solution enhances tissue exposure and reduces tissue injury by providing controlled retraction forces, minimizing the need for repositioning and reducing operator fatigue, while maintaining stability and allowing for selective rotation of retractor blades during surgical procedures.
Implementation Method 1
utilizing distraction pins and co operating sleeves to optimize mechanical advantage and efficiency
Implementation Method 2
The teeth grip into or under the tissues and apply lateral forces as the handles are compressed
Data Source
AI summary
An assembly allowing retraction of soft tissue away from a reference plane; the assembly including at least one retracting element each having a distal end with a formation allowing anchorage of the at least one retracting element. The assembly also includes a proximal end of the at least one retracting element capable of movement through at least one degree of freedom relative to the anchorage.