Adjustable Medical Device Shape Transition Locking Mechanism
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Solution Overview
Problem
Existing shape-memory medical devices require specialized delivery devices and methods for minimally-invasive procedures and may not be strong enough for certain applications.
Innovation Solution
An elongate medical device with shape-changing features and a locking mechanism that transitions from a small delivery configuration to a larger delivered configuration without needing specialized delivery devices, featuring a spine portion, openings, a shuttle, and a locking mechanism to maintain a predetermined curved shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If shape-memory devices are used for minimally-invasive procedures, then the device can be delivered in a constrained configuration, but the device requires specialized delivery devices and methods
Solution Approach 1:
The device is divided into multiple segments or struts that can be independently controlled. Each segment can be deployed sequentially or simultaneously by releasing individual locking mechanisms, allowing the device to be delivered in a constrained state and then expanded to its functional configuration without requiring complex specialized delivery devices
Solution Approach 2:
The device transitions from a static constrained delivery configuration to a dynamic functional configuration through controlled deployment of segments and adjustment of locking mechanisms. This dynamic transformation allows the device to adapt its shape and size during the procedure, eliminating the need for specialized delivery devices
2Ease of operation
If shape-memory devices are used for minimally-invasive procedures, then the device can be delivered through narrow pathways, but the device may not be sufficiently strong for certain procedures
Solution Approach 1:
The device consists of multiple strong structural segments or struts that can be delivered in a compressed state and then assembled or expanded at the target site. Each segment maintains structural integrity while allowing the overall device to be delivered through narrow pathways, and the assembled structure provides the necessary strength for the procedure
Solution Approach 2:
The device utilizes composite material construction combining flexible materials for the delivery state with strong structural materials for the functional state. This allows the device to be sufficiently strong when deployed while still being deliverable in a constrained configuration through minimally-invasive approaches
3Shape
If the device transitions from a smaller delivery configuration to a larger delivered configuration, then the device achieves functional shape, but the transition requires specialized delivery devices
Solution Approach 1:
The device is pre-formed with its final functional shape and locking mechanisms are pre-positioned, but remain locked in a constrained delivery configuration. The transition to the functional shape is achieved by simply releasing the locking mechanisms at the target site, eliminating the need for specialized delivery devices while maintaining the predetermined curved shape
Data Source
Figure 1A~1C
Figure 1D~1E
Figure 2A~2B
AI summary
Medical devices that can be delivered in a first, flexible configuration and subsequently locked into a second, rigid configuration are provided. The device comprises an elongate body having a plurality of slots openings along a bending portion of the body. Using a tension member to shorten the distance between two points along the elongate body causes the device to curve. The device can be locked into the curved configuration.