Catheter Pump Inlet Graft Structure for Stable Stent Connection
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Solution Overview
Problem
The collapse of the distal end of the stent in collapsible catheter pumps can lead to detachment of the adhered film, compromising the connection stability and affecting the blood inlet, while increasing the coverage area of the film to enhance stability reduces the size of the blood inlet.
Innovation Solution
A catheter pump design with a film and stent connection system where the film includes first and second connecting portions, with the second connecting portion having a greater width in the circumferential direction to enhance connection strength without overlapping and minimizing coverage over the inlet, ensuring the film does not detach and maintaining the blood inlet size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the coverage area of the film over the distal end of the stent is increased to enhance connection stability, then the film is less prone to detachment, but the size of the blood inlet is reduced, affecting the blood-pumping function
Solution Approach 1:
The film is divided into multiple functional segments: a first connecting portion with smaller width for attachment to the inlet portion, and a second connecting portion with larger width for attachment to the distal connecting portion. This segmentation allows each portion to serve its specific function optimally without compromising the other.
Solution Approach 2:
Different portions of the film are designed with different widths to meet local requirements: the first connecting portion has a smaller width to minimize interference with the blood inlet, while the second connecting portion has a larger width to provide sufficient connection strength at the distal end where detachment risk is higher.
2Stability of the object's composition
If the film is adhered to the distal end of the stent to prevent detachment, then connection stability is improved, but the blood inlet size is reduced when coverage area is increased
Solution Approach 1:
The film structure is segmented into different width portions, with the first connecting portion having a width specifically optimized to minimize impact on blood inlet while maintaining adequate connection stability through strategic placement and adhesive bonding.
3Strength
If the second connecting portion has a greater width to enhance connection strength, then detachment is prevented, but the structure becomes more complex
Solution Approach 1:
The film is segmented into portions with different widths, where the second connecting portion has greater width than the first connecting portion. This segmentation provides enhanced connection strength at the distal end while maintaining simplicity through a continuous film structure without additional components.
Data Source
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AI summary
A catheter pump, comprising: a catheter and a pump head located at the distal end of the catheter and used for pumping blood. The pump head comprises a pump housing provided with a blood inlet and a blood outlet; the pump housing comprises a stent and a graft that are connected to the distal end of the catheter; the stent is operably switched between a radial folded state and a radial unfolded state; in the radial unfolded state, the stent comprises a body portion covered with the graft, an inlet portion located at the axial distal end of the body portion and an outlet portion located at the axial proximal end of the body portion; the inlet portion and the outlet portion are connected to and support the body portion; a distal end connecting portion is connected to the distal end of the inlet portion; and the graft comprises a first connecting portion and a second connecting portion located at the distal end thereof, the second connecting portion is connected to the distal end of the first connecting portion, at least part of the first connecting portion is located on the outer surface of the inlet portion, the second connecting portion is located on the outer surface of the distal end connecting portion and is fixedly connected to the distal end connecting portion, and the circumferential width of the second connecting portion is greater than that of the first connecting portion.