Curved Bone Cavity Device for Offset Vertebroplasty
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for forming cavities in bone structures, such as vertebral bodies, often restrict the ability to accurately place stabilizing materials due to the linear configuration of access cannulas and expandable devices, which can limit the formation of cavities at desired locations within the confined anatomy of the vertebral body.
Innovation Solution
A system and method involving a channel forming device with a deflectable distal segment that creates a curved channel within the bone, allowing a cavity forming device with an expandable body to be advanced along this curved path, enabling the delivery of curable material to a location offset from the central axis of the access cannula, using shape memory materials or expandable balloons to form the cavity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a linear configuration of access cannula and expandable body is used, then the device can be easily inserted through the access cannula, but the cavity can only be formed at a limited area in line with the central axis, restricting the ability to reach desired target sites
Solution Approach 1:
The expandable body is configured with a curved or angled orientation relative to the longitudinal axis of the access cannula, allowing the distal end of the expandable body to be positioned at a target site that is laterally displaced from the central axis of the access cannula. This curved configuration enables the device to reach desired cavity formation locations that would be inaccessible with a linear arrangement.
Solution Approach 2:
The invention transitions from a one-dimensional linear path (along the central axis) to a two-dimensional or three-dimensional path by introducing curvature or angling to the expandable body. This allows the device to access target sites in multiple directions and planes, expanding the reachable area within the bone structure beyond the limited linear path.
2Ease of operation
If the access cannula is positioned immediately adjacent to the vertebral pedicle, then the procedure can be performed through a confined access site, but the linear configuration restricts the expandable body to a limited area
Solution Approach 1:
The curved or angled configuration of the expandable body allows the distal end to be precisely positioned at a target site that is laterally displaced from the access cannula's central axis. This enables accurate cavity formation at the desired location within the vertebral body, overcoming the spatial limitations imposed by the confined pedicular access site.
3Manufacturing precision
If a curved channel is created in the bone structure, then the expandable body can be advanced to a location offset from the central axis, but the device complexity increases
Solution Approach 1:
The expandable body itself is configured with a curved or angled geometry, eliminating the need for a separate curved channel-forming device. The curved expandable body naturally follows a curved path through the bone to reach the target site, achieving precise cavity placement while maintaining relative device simplicity by integrating the curvature into the expandable body rather than requiring a complex curved channel creation mechanism.
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 approach allows for the formation of cavities at desired locations laterally displaced from the central axis of the access cannula, enhancing the precision and effectiveness of bone stabilization procedures like vertebroplasty by facilitating the delivery of curable materials to specific sites within the bone structure.
Implementation Method 1
The expandable body is operable between a contracted state and an expanded state. During insertion into the access cannula, the expandable body is in the contracted state. The distal portion is then distally advanced from the distal end of the access cannula, with the distal portion of the cavity creating device following a path of the curved channel. The expandable body is transitioned to the expanded state to form a cavity in the bone structure.
Implementation Method 2
the distal segment of the channel creating device has a shape memory characteristic and naturally assumes a curved shape in longitudinal extension
Data Source
AI summary
Methods of injecting curable material within a bone structure, such as vertebroplasty, include locating a distal end of an access cannula within the bone structure. A channel creating device is inserted into a cannula lumen. A distal segment of the channel creating device is distally advanced from cannula distal end and into the bone structure. A curved channel is created in the bone structure with the distally advancing distal segment. A distal portion of a cavity creating device is then inserted into the cannula lumen, with the distal portion including an expandable body carried by an elongated body. The distal portion is distally advanced, following a path of the curved channel. The expandable body is transitioned to the expanded state to form a cavity in the bone structure. Finally, curable material is delivered to the cavity.