Interspinous Implant With Switchable Dynamic Extension Control
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Solution Overview
Problem
Existing interspinous and interlaminal fusion devices lack reliable bone fixation and are either dynamic or non-dynamic, leading to high rates of reoperation and recurrence of symptoms, especially in osteoporotic patients, without providing an all-in-one solution for controlled dynamic or non-dynamic stabilization.
Innovation Solution
An interspinous posterior device (IPD) with adjustable bone fixation elements and a removable extension restriction block, allowing real-time conversion between dynamic and non-dynamic configurations, ensuring secure implantation and customizable stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a non-dynamic interspinous implant is used, then spinal stability is improved, but device loosening and reoperation rates increase due to lack of dynamic adaptation
Solution Approach 1:
The patent applies the dynamics principle by designing an interspinous implant that can transition between dynamic and non-dynamic states. The implant includes a blocker element that can be inserted or removed to convert the device between configurations, allowing it to adapt to changing patient needs and physiological conditions, thereby improving device retention while maintaining spinal stability.
Solution Approach 2:
The patent implements parameter changes by allowing modification of the implant's mechanical properties through the blocker element. By inserting or removing the blocker, the device's stiffness and motion restriction characteristics can be changed, enabling adaptation to patient recovery progress and reducing loosening rates.
2Adaptability or versatility
If a dynamic interspinous implant is used, then motion preservation is improved, but stabilization reliability deteriorates due to insufficient load control
Solution Approach 1:
The patent applies dynamics by designing an implant that can operate in dynamic mode to preserve motion during early recovery, then be converted to non-dynamic mode for enhanced stabilization as healing progresses. This temporal adaptation resolves the contradiction between motion preservation and stabilization reliability.
Solution Approach 2:
The patent implements preliminary action by allowing the implant to be initially configured in a dynamic state that preserves motion and reduces stress on healing structures. The blocker element can be inserted later to convert to non-dynamic mode, providing preliminary motion preservation followed by enhanced stabilization when needed.
3Device complexity
If fixed dynamic or non-dynamic configuration is used, then device simplicity is improved, but clinical adaptability deteriorates requiring high reoperation rates
Solution Approach 1:
The patent applies segmentation by dividing the implant into modular components, including the blocker element that can be independently inserted or removed. This modular design allows clinical adaptability without requiring completely different devices, resolving the contradiction between simplicity and adaptability.
Solution Approach 2:
The patent implements a dynamically reconfigurable device where the blocker element can be added or removed based on clinical needs. This allows a single device design to serve multiple clinical scenarios, reducing reoperation rates while maintaining relative simplicity through a standardized base configuration.
4Adaptability or versatility
If revision surgery is performed, then device functionality is improved, but patient morbidity and time increase
Solution Approach 1:
The patent applies segmentation by designing the implant as modular components that can be independently manipulated. The blocker element can be inserted or removed through minimal access, allowing functionality changes without extensive surgery, thereby reducing patient morbidity and surgical time.
Solution Approach 2:
The patent implements the principle of discarding and recovering by allowing the blocker element to be removed or exchanged rather than requiring complete device removal. This enables functionality changes through minimal intervention, reducing revision surgery time and patient morbidity while maintaining adaptability.
Data Source
AI summary
An interspinous posterior device (IPD) is described. The IPD has a body and bone fixation elements on either side of the body, each of said bone fixation elements having a ratchet locking mechanism for fixing the body to successive spinous processes of a mammalian vertebra. Each of the bone fixation elements is independently adjustable by ratcheting it separately and independently of the other bone fixation elements. The body of the IPD has a dynamic configuration and a non-dynamic configuration, wherein the dynamic configuration allows for both extension and flexion of the successive spinous processes and the non-dynamic configuration prohibits extension of the successive spinous processes. The IPD also includes a removable extension restriction block, wherein the extension restriction block can optionally be inserted in the body to prohibit extension or can be removed from the body to allow extension.