Deflectable Wing Cannula for Kyphoplasty Balloon Control
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Solution Overview
Problem
Conventional scoop cannulas used in kyphoplasty procedures fail to prevent balloons from rolling and often undergo plastic deformation under high pressure, leading to complications during balloon inflation and removal.
Innovation Solution
A scoop cannula with deflectable wings made from shape memory or superelastic materials, such as Nitinol, is designed to support the balloon from the sides and bottom, preventing rolling and allowing elastic deformation to maintain structural integrity during inflation and deflation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional scoop cannulas are used to direct balloon inflation, then the balloon can be inserted into the vertebral body, but the balloon rolls over the scoop and inflates in unintended directions
Solution Approach 1:
The scoop is segmented into multiple deflectable wings that can independently move to guide the balloon. This segmentation allows each wing to respond to balloon pressure and actively direct the balloon along the intended path, preventing rolling and ensuring reliable directional control during inflation.
Solution Approach 2:
The wings are designed to be deflectable rather than fixed, allowing them to dynamically adjust their position in response to balloon inflation pressure. This dynamic behavior enables the wings to actively guide the balloon while accommodating the inflation process, improving both ease of operation and reliability of direction control.
2Force
If high pressure is applied to inflate the balloon, then the balloon can effectively create a cavity in the vertebral body, but the scoop cannula undergoes plastic deformation
Solution Approach 1:
The material properties of the scoop cannula are changed by using shape memory or superelastic materials instead of conventional materials. This parameter change allows the cannula to withstand high inflation pressures without permanent deformation, as these materials can elastically deform and return to their original shape, maintaining structural integrity while enabling effective cavity creation.
Solution Approach 2:
The invention uses advanced materials with superior elastic properties (shape memory alloys or superelastic materials) to construct the scoop cannula. These composite or specialized materials provide the necessary strength and elasticity to resist plastic deformation under high pressure while maintaining the structural integrity needed for safe removal after the procedure.
3Strength
If the scoop cannula is made rigid to maintain structural integrity, then the cannula can withstand pressure, but it cannot deflect to guide the balloon properly
Solution Approach 1:
The scoop is divided into multiple deflectable wings that can move independently while remaining attached to the rigid cannula body. This segmentation allows the wings to provide flexible guidance for the balloon, while the rigid cannula maintains overall structural integrity and withstands inflation pressures.
Solution Approach 2:
Different parts of the cannula have different mechanical properties: the main cannula body is rigid to maintain structural integrity, while the wings are made deflectable to provide local flexibility for balloon guidance. This local quality differentiation allows both rigid strength and flexible guidance to coexist in the same 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
The cannula effectively directs balloon inflation to the intended area, increases lifting force by distributing load, and minimizes deformation, facilitating safe insertion and removal without permanent damage.
Implementation Method 1
scoop cannulas with deflectable wings configured to support the balloon as the balloon is inflated... plastic deformation of the scoop cannula can occur when balloons are inflated to high pressures. Such deformation causes the scoop to bend permanently... made from shape memory or superelastic materials
Implementation Method 2
made from shape memory or superelastic materials, such as Nitinol
Implementation Method 3
made from shape memory or superelastic materials, such as Nitinol
Data Source
Figure 1~2
Figure 3~4
Figure 5~8
AI summary
A kyphoplasty cannula includes a shaft extending between opposite first and second end surfaces. The shaft includes an inner surface defining a lumen. The shaft includes a first opening that extends through the first end surface and a second opening that extends through the second end surface. A scoop extends from the second end surface. The scoop includes an arcuate surface that is continuous with the inner surface. Kits and methods of use are disclosed.