Dual Layer Stentriever for Simultaneous Thrombectomy and Stenting
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Solution Overview
Problem
Current medical devices for treating intravascular occlusions in the cerebral blood vessels often struggle to differentiate between blood clots and stenotic lesions, leading to prolonged procedure times and increased risk of rupture or fragmentation, especially when both conditions are present, which can result in severe complications such as stroke or death.
Innovation Solution
A dual-capability device that combines mechanical thrombectomy and stenting capabilities, featuring a stent cage with large cell openings for clot retrieval and radial expansion to address stenosis, allowing for immediate deployment and potential implantation as a permanent stent to maintain vessel patency, along with a fragment protection element to prevent embolization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple catheters and devices are used to treat both clot and stenosis, then treatment completeness is improved, but procedure time increases and risk of rupture/fragmentation increases
Solution Approach 1:
The patent combines clot retrieval and stenting functions into a single integrated device. The stentriever device includes a stent portion and a retrieval portion that work together to simultaneously address both the occluding clot and the underlying stenotic lesion, eliminating the need for separate devices and reducing procedure time.
Solution Approach 2:
The device performs multiple functions: it can retrieve clots through aspiration or mechanical engagement, and it can simultaneously provide stenting to address stenosis. This multi-functional design allows a single device to handle both thrombectomy and stenting requirements.
2Reliability
If multiple devices are deployed to address both clot and stenosis, then treatment effectiveness is improved, but device complexity increases
Solution Approach 1:
The patent merges the functionality of separate clot retrieval devices and stents into a single integrated stentriever device. The device includes a stent portion for addressing stenosis and a retrieval portion for clot removal, combining what would traditionally require multiple separate devices.
Solution Approach 2:
The retrieval portion is nested within or integrated with the stent portion of the device. The microporous stent portion can contain or work in conjunction with the clot retrieval mechanism, creating a nested structure that consolidates multiple functions into one device.
3Reliability
If multiple passes are made to remove clot and treat stenosis, then treatment thoroughness is improved, but risk of fragment release increases
Solution Approach 1:
The device allows simultaneous clot retrieval and stenting in a single pass. The stent portion provides structural support while the retrieval portion removes the clot, eliminating the need for multiple passes that would increase the risk of fragment release.
Solution Approach 2:
The stent portion is deployed first to provide structural support and stabilize the vessel, preventing further fragmentation or dislodgement of clot material before the retrieval portion removes the clot. This preliminary stabilization reduces the risk of harmful fragment release.
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 device reduces procedure times, enhances clinical outcomes by allowing simultaneous clot removal and stenting, and minimizes the risk of vascular occlusions by providing improved flexibility and protection against embolization, thus reducing the likelihood of complications during ischemic stroke treatment.
Implementation Method 1
the outer cage can be configured to expand to a greater radial extent than the expanded capture section
Implementation Method 2
Applied aspiration during the procedure can assist in dislodging the clot from the vessel
Data Source
AI summary
A design bringing together mechanical thrombectomy and stenting for more efficient treatment of occlusions and stenotic lesions in the cerebral vasculature features a dual-layer setup. The outer layer consists of an expandable stent cage with large cell openings which can allow thrombus to pass through the openings into the inner expandable capture section layer. The clot capture section can be configured to grip and extract the occlusion. The outer cage is configured to be detached from the remainder of the device and left implanted as a stent to exert an outward radial force to support and/or dilate the region of stenosis. The device can have a distal fragment protection element to prevent the distal migration of elements liberated during the procedure.