Modular Intralumenal Device with Detachable Anchor
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Solution Overview
Problem
Current medical devices, such as micro-axial blood pumps, face challenges in safe retrieval due to tissue overgrowth, risking vessel damage and complications like intimal tear and vessel dissection during removal, especially after chronic implantation.
Innovation Solution
A modular intralumenal device and lumen wall anchor assembly with an expandable anchor that can be released from the device during explantation, allowing the device to be retrieved while leaving the anchor in place, reducing the risk of vessel damage and minimizing medical risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the device is solidly anchored to the vessel wall during chronic implantation, then the device stability is improved, but the risk of vessel damage during retrieval increases
Solution Approach 1:
The anchoring system is divided into separate components: an expandable anchor that remains in the vessel wall and a device that can be detached and removed. This segmentation allows the anchor to provide stable anchoring during chronic implantation while enabling safe device retrieval by detaching and removing only the device portion, leaving the anchor in place to prevent vessel damage.
Solution Approach 2:
The harmful component (the device) is extracted from the anchored structure during retrieval. The anchor remains embedded in the vessel wall to maintain stability and prevent damage, while the device is detached and removed separately. This extraction approach allows the beneficial anchoring function to persist while eliminating the source of potential vessel damage.
2Duration of action of stationary object
If tissue overgrowth occurs over the device during chronic implantation, then the device becomes firmly integrated, but device retrieval becomes difficult and dangerous
Solution Approach 1:
By separating the device from the anchor, tissue overgrowth is directed primarily toward the anchor structure that remains in the vessel wall. The device itself can be detached before significant overgrowth occurs, or the anchor's structure is designed to accommodate and facilitate retrieval even with some tissue integration, reducing the danger of tearing during removal.
Solution Approach 2:
The anchor acts as an intermediary structure that interfaces with the vessel wall and accommodates tissue overgrowth, while the device interfaces with the anchor through a detachable connection. This intermediary anchor structure absorbs the mechanical stress of tissue integration, protecting the device and allowing for safer detachment and retrieval without direct device-to-vessel-wall adhesion.
3Strength
If anchoring pins engage the vessel wall to hold the device in place, then the anchoring strength is improved, but the risk of intimal tear and vessel dissection increases
Solution Approach 1:
The anchoring pins are separated from the device body and attached to the anchor structure that remains in the vessel wall. This segmentation allows the pins to provide strong anchoring engagement with the vessel wall while the device itself can be detached and removed without the pins, eliminating the source of intimal tear and vessel dissection risk during retrieval.
Solution Approach 2:
The harmful anchoring elements (pins that engage the vessel wall) are extracted from the removable device portion and left in the anchor structure. During retrieval, only the device is removed while the pins remain engaged with the vessel wall through the anchor, taking out the source of potential vessel damage while maintaining anchoring function.
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
Enables atraumatic retrieval of medical devices by reducing the risk of vessel damage and complications associated with tissue overgrowth, allowing for safe removal without causing further harm to the patient.
Implementation Method 1
radially expanding structures holding the device in place by strong outwardly biased radial forces
Data Source
AI summary
Transcatheterly implantable mammalian body conduit intralumenal device and lumen wall anchor assembly. Anchor includes: wire network, connector positioning wires having a secured and a released position, and a connector disposed at end of each wire. Anchor has: a compact-secured-configuration, an expanded-secured-configuration, an expanded-released-configuration. When the anchor is in the expanded-secured-configuration, the wire network exerts a force on conduit lumen wall and the connector positioning wires are the in secured position. When the anchor is in the expanded-released-configuration, the connector positioning wires are in the released position, and do not obstruct fluid flow axially through conduit. Device includes an interconnector that allows for the releasable interconnector of the connectors thereto. Device and anchor assembly can be explanted from the conduit. Or, device can be released from the anchor at the implantation site and only the device explanted with the anchor remaining within the conduit.