Interspinous Implant With Deployable Locking Wings
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Solution Overview
Problem
Current surgical treatments for lumbar spinal stenosis, such as decompressive laminectomy and interspinous process decompression (IPD), often require invasive procedures and incisions for implantation of devices like the X-STOP device, which can be cumbersome and invasive.
Innovation Solution
A spinal implant with deployable wings that can be percutaneously inserted into the interspinous space, featuring a body portion with locking wings that can be stowed and deployed to engage spinous processes, along with a method and tool kit for percutaneous placement and sizing, allowing for minimally invasive treatment of lumbar spinal stenosis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional decompressive laminectomy is performed, then spinal stenosis is effectively treated, but invasive bone removal and extensive incisions are required
Solution Approach 1:
The implant is divided into a body portion and separate locking wings that can be deployed independently. The locking wings are initially retracted within the body portion and then deployed to engage the spinous processes, allowing the implant to provide decompression without requiring extensive bone removal or incisions.
Solution Approach 2:
The locking wings are nested within the body portion of the implant during insertion. The body portion contains an interior cavity that houses the locking wings in a retracted state, allowing minimally invasive insertion through a small incision, and then the wings are deployed from this nested configuration to engage the spinous processes.
2Ease of manufacture
If X-STOP device is used for IPD surgery, then spinal stenosis is treated without bone removal, but still requires incision for implantation
Solution Approach 1:
The locking wings are designed to be dynamic, transitioning from a retracted state within the body portion during insertion to a deployed state that engages the spinous processes. This dynamic configuration allows the implant to achieve secure anchoring without requiring a large incision for manual placement of individual wings.
Solution Approach 2:
The implant is designed with self-deploying locking wings that can be actuated after insertion. The deployment mechanism allows the wings to automatically engage the spinous processes without requiring the surgeon to manually position each wing through a large incision, thereby reducing the incision size while maintaining secure anchoring.
3Stability of the object's composition
If locking wings are deployed to engage spinous processes, then implant stability is improved, but device complexity increases
Solution Approach 1:
The locking wings are merged with the body portion as an integrated unit rather than separate components. This integration simplifies the overall device structure while enabling the wings to be deployed from the retracted configuration within the body portion to engage the spinous processes, achieving stability without requiring multiple separate implant components.
Data Source
AI summary
A spinal implant for treating lumbar spinal stenosis or as an adjunct to spinal fusion. The implant includes a body portion having an interior cavity. A plurality of locking wings are adapted and configured to move between a stowed position retracted within the interior cavity of the body portion and a deployed position extended from the interior cavity of the body portion. In the deployed position, the wings fix the implant in a selected interspinous space. A cable and wheel arrangement moves the plurality of locking wings from the stowed position to the deployed position and a ratchet/pawl assembly prevents backward movement of the wings.