Spiral Cut Hypotube

The path of the hypotube to the target site is usually tortuous, so the catheter is preferably relatively flexible to allow it to pass through the vasculature to the desired site. On the contrary, the catheter may be required to pass through the constricted blood vessel, so it is also desirable that it has at least some rigidity. When the catheter is correctly positioned, the delivery system must follow the path defined by the catheter, so the delivery system also preferably has similar flexibility and rigidity characteristics.

A hypotube having at least a portion of a tube defined by a wound spring or a spiral cut tube can provide a desired level of flexibility and rigidity, but for certain applications, it may be desirable for the tube to provide some elongation or stretch resistance properties. For these types of applications, wound springs or spiral cut parts are not suitable because they have a tendency to stretch or stretch. This proposes self-expanding stent delivery using inner and outer elongated shells with slots interrupted by solid struts, which can be oriented in a spiral pattern evenly spaced.

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