Dilation Delivery System for Minimally Invasive Cannula Placement
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Solution Overview
Problem
Current methods for installing medical cannulas within the body, such as mechanical circulatory support devices, often require significant surgical disruption and risk life-threatening blood loss during the placement of inlet cannulas through the heart wall, necessitating a more minimally invasive and safer approach.
Innovation Solution
A kit comprising a sheath with a tapered surface defined by flaps, a delivery tube, an elongated cannula, and a dilator, where the flaps pivot open to facilitate cannula placement and an expandable anchor secures the cannula within the organ, minimizing blood loss and surgical disruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cannula is installed by coring a hole in the heart wall, then the cannula can be placed through the wall, but life-threatening blood loss occurs through the hole during installation
Solution Approach 1:
The dilator is advanced through the heart wall before the cannula to create a pre-formed tract. This preliminary action allows the cannula to be threaded through the existing path without requiring a separate coring step, thereby eliminating the risk of uncontrolled blood loss during hole creation while ensuring proper cannula placement
2Object-affected harmful factors
If a limited thoracotomy is used for cannula installation, then surgical disruption is minimized, but the procedure becomes more complex and time-consuming
Solution Approach 1:
The delivery system employs a nested structure where the cannula is contained within the delivery tube, which is in turn contained within the sheath. The dilator serves as the innermost component. This nested arrangement allows all components to be introduced through a single small incision, minimizing surgical disruption while maintaining procedural simplicity through integrated design
3Ease of operation
If a dilator is used to create a tract through the heart wall, then cannula placement is facilitated, but the dilator must be longer than the cannula requiring extended manipulation
Solution Approach 1:
The dilator is designed as a separate, removable component that is extracted from the cannula after the cannula has been successfully positioned. This extraction allows the dilator to be sufficiently long for effective heart wall penetration and tract creation, while the final implanted device (cannula) remains at the appropriate length without the extended dilator portion
Data Source
AI summary
A kit including a sheath having a tubular body with proximal and distal ends, an axis extending between the ends and a wall defining a bore extending along the axis to the distal end of the body. A delivery tube having proximal and distal ends and a lumen is adapted for disposition within the bore of the sheath in sealing engagement with the sheath, the delivery tube being slideable distally relative to the sheath. An elongated cannula having proximal and distal ends and a lumen is adapted for disposition inside the lumen of the delivery tube and an elongated dilator is adapted to fit within the lumen of the cannula with a proximal portion of the dilator extending proximally beyond the proximal ends of the cannula and delivery tube and in sealing engagement with the delivery tube proximal to the cannula.