Selective Blocking Door Assembly for Blood-Loss-Controlled LVAD Mating
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Solution Overview
Problem
During off-pump, beating heart LVAD implantation, significant blood loss occurs when the heart pump nozzle is inserted, obscuring the surgical site and complicating the mating process, which can lead to fatal outcomes.
Innovation Solution
A selective blocking door device is used to couple to the mating base of the heart pump, featuring a coupling assembly with pivotable coupling members and a door assembly that can transition between open and closed positions to control blood flow, allowing for controlled insertion and removal of the nozzle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the aperture is cored in the heart to insert the outlet nozzle, then the heart pump can be installed to pump blood, but significant blood loss occurs and the treatment area is obscured
Solution Approach 1:
The blocking door is positioned in advance within the mating base to seal the aperture before the coring operation begins. This preliminary blocking action prevents blood from escaping during the entire coring and nozzle insertion process, eliminating the need for post-coring hemostatic measures and preventing the severe blood loss that would otherwise occur.
Solution Approach 2:
The blocking door acts as an intermediary element between the aperture and the external environment. It provides a temporary seal that allows the surgical team to perform the coring operation and insert the nozzle without direct exposure to high-pressure blood flow, thereby preventing blood loss while maintaining surgical access.
2Ease of operation
If the aperture is cored in the heart, then the outlet nozzle can be inserted, but blood flow obscures the treatment area making mating difficult
Solution Approach 1:
The blocking door is installed in advance to seal the aperture before coring begins. This preliminary sealing action maintains a clear, blood-free surgical field throughout the entire procedure, allowing surgeons to easily visualize and precisely perform the mating operation between the outlet nozzle and mating base without obstruction from blood flow.
3Loss of substance
If the blocking door is used to obstruct blood flow, then blood loss is minimized, but the device complexity increases
Solution Approach 1:
The selective blocking door device is divided into distinct functional segments: the blocking door itself, the coupling assembly with pivotable members, and the release mechanism. This segmentation allows each component to perform its specific function independently while maintaining overall system simplicity. The modular design facilitates easy manufacturing and assembly without requiring complex integrated structures.
Solution Approach 2:
Instead of trying to control or redirect blood flow through complex valve mechanisms, the invention inverts the approach by using a simple blocking door that can be opened or closed as needed. This inversion from active flow control to passive blocking simplifies the device structure while effectively preventing blood loss during the procedure.
Data Source
AI summary
A selective blocking door device includes a coupling assembly that is configured to be removably secured to a mating base that is secured to a human heart. A frame assembly is secured to the coupling assembly, and a closure assembly is configured to linearly displace within opposing lateral slots of the frame assembly from a first open position to a second closed position. In the open position, no portion of the closure assembly is configured to be aligned with a central aperture of the mating base such that the central aperture is clear of any obstruction by the closure assembly. In the closed position, a portion of the closure assembly is configured to be aligned with the central aperture of the mating base such that the central aperture is covered and obstructed by a portion of the closure assembly.