Multichannel Cannula for Kyphoplasty Void Creation and Cement Delivery
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Solution Overview
Problem
Conventional kyphoplasty procedures are cumbersome and time-consuming due to the need for multiple steps involving various tools for bone void creation and cement delivery, especially when treating multiple vertebrae or requiring additional space creation.
Innovation Solution
A multichannel cannula is used that includes a first channel for a stabilizing wire and a second channel with an expandable portion for creating a void in the bone, allowing for simultaneous bone void creation and cement delivery, reducing the need for multiple device introductions and simplifying the procedure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional methods use separate devices for bone void creation and cement delivery, then each function can be performed with a specialized tool, but the procedure becomes cumbersome and time-consuming due to multiple device introductions and removals
Solution Approach 1:
The patent combines the bone void creation function and cement delivery function into a single multichannel cannula device. The cannula has multiple channels that allow an expandable balloon to create a void and a cement delivery catheter to fill the void, eliminating the need to remove and replace devices between steps.
Solution Approach 2:
The multichannel cannula serves multiple functions simultaneously: it provides structural support as a cannula, houses an expandable balloon for void creation, and contains a catheter for cement delivery. This multi-functional design reduces procedural steps while maintaining specialized capabilities for each function.
2Productivity
If multiple devices are used for sequential steps, then each step can be optimized with specialized equipment, but the overall procedure time increases significantly
Solution Approach 1:
The multichannel cannula enables continuous useful action by maintaining device presence throughout the procedure. The expandable balloon creates the void and then deflates to allow cement delivery through the same cannula, eliminating idle time for device removal and reinsertion between critical steps.
Solution Approach 2:
The cannula is inserted and positioned before the actual treatment steps begin. The stabilizing wire is placed through the cannula first, providing a guide and structural framework that enables subsequent balloon expansion and cement delivery without requiring additional access procedures.
3Reliability
If the expandable balloon remains inflated during cement delivery, then the void space is maintained, but the cement cannot be delivered into the void
Solution Approach 1:
The expandable balloon is designed to dynamically change its state from inflated to deflated. It inflates to create and maintain the void space, then deflates to allow cement delivery, and can be re-inflated if additional space is needed. This dynamic behavior resolves the contradiction between maintaining void space and enabling cement delivery.
Solution Approach 2:
The balloon undergoes periodic inflation and deflation cycles during the procedure. It is inflated to create the initial void, deflated to allow cement delivery, and can be re-inflated if additional void space is required. This periodic action sequence allows both void maintenance and cement delivery to occur at appropriate times.
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
The multichannel cannula streamlines the kyphoplasty process by enabling efficient void creation and cement delivery with a single device, reducing procedural complexity and time, and allowing for more precise and efficient restoration of vertebral height.
Implementation Method 1
an expandable portion configured to expand away from the multichannel cannula from an outer wall of the second channel
Implementation Method 2
the inlet portal and the exit portal are in fluid communication
Data Source
AI summary
A method of using a multichannel cannula to perform kyphoplasty includes inserting a stabilizing wire into a vertebra damaged by a compression fracture and inserting, over the stabilizing wire, a cannula. The cannula includes a first channel having open proximal and distal ends, and is configured to receive the stabilizing wire, and a second channel having an inlet portal and an exit portal that are in fluid communication. The cannula further includes an expandable portion configured to expand away from the cannula from an outer wall of the second channel. The method also includes inflating the expandable portion to create a void in the bone and to restore the height of the vertebra, and then deflating the expandable portion. When the void has been created, bone cement is delivered through the second channel into the void via the exit portal to at least partially fill the void.