Adjustable implantable devices and associated methods
The present technology includes systems and methods for invasively adjusting implantable devices for selectively controlling fluid flow between a first body region and a second body region of a patient. For example, in many of the embodiments described herein, a catheter can be used to mechanically and/or electrically engage an implanted medical device. Once the catheter engages the medical device, the catheter can (i) increase a dimension associated with the medical device, such as through mechanical expansion forces, and/or (ii) decrease a dimension associated with the medical device, such as by heating a shape memory component of the medical device above a phase transition temperature.
1. A method of adjusting an implanted shunt fluidly coupling a first body region and a second body region, the method comprising:
advancing an elongated body through the patient's vasculature and toward the implanted shunt;
positioning the elongated body within a lumen extending through the shunt or proximate to an inlet orifice or an outlet orifice of the lumen;
temporarily reducing a flow of fluid through the lumen using one or more flow obstruction elements coupled to the elongated body; and
after temporarily reducing the flow of fluid through the lumen, and while the flow of fluid remains temporarily reduced, heating a shape memory component of the shunt, wherein heating the shape memory component transforms the shunt from a first configuration to and/or toward a second configuration,
wherein transforming the shunt from the first configuration to and/or toward the second configuration alters an inner dimension of the shunt associated with the lumen without substantially altering an outer dimension of the shunt.
2. The method of claim 1 wherein heating the shape memory component comprises heating the shape memory component via the elongated body.
3. The method of claim 2 wherein the elongated body includes an expandable member transitionable between a low-profile delivery configuration and an expanded configuration, and wherein heating the shape memory component comprises expanding the expandable member and heating via the expanded expandable member.
4. The method of claim 2 wherein the elongated body includes an expandable member transitionable between a low-profile delivery configuration and an expanded configuration, and wherein the method further includes, after heating the shape memory component and altering the inner dimension associated with the lumen, selectively expanding the expandable component to further alter the inner dimension associated with the lumen.
5. The method of claim 1 wherein the one or more flow obstruction elements include a balloon, and wherein temporarily reducing the flow of fluid through the lumen using the one or more flow obstruction elements includes:
inflating the balloon; and
positioning the balloon to block the inlet orifice, an interior of the lumen, or the outlet orifice of the lumen.
6. The method of claim 5 wherein inflating the balloon includes inflating the balloon to a size that is larger than the inlet orifice or the outlet orifice.
7. The method of claim 1 wherein the one or more flow obstruction elements includes a hood, and wherein temporarily reducing the flow of fluid through the lumen using one or more flow obstruction elements includes advancing the hood over the inlet orifice or the outlet orifice of the lumen.
8. A method of adjusting an implanted shunt fluidly coupling a first body region and a second body region, the method comprising:
advancing an elongated body through the patient's vasculature and toward the implanted shunt;
positioning the elongated body within a lumen extending through the shunt or proximate to an inlet orifice or an outlet orifice of the lumen;
releasably coupling a positioning element on the elongated body to the shunt and/or a portion of patient tissue adjacent the shunt, wherein releasably coupling the positioning element to the shunt and/or the portion of patient tissue adjacent the shunt stabilizes and/or aligns the elongated body relative to the shunt; and
after releasably coupling the positioning element, heating a shape memory component of the shunt, wherein heating the shape memory component transforms the shunt from a first configuration to and/or toward a second configuration,
wherein transforming the shunt from the first configuration to and/or toward the second configuration alters an inner dimension of the shunt associated with the lumen without substantially altering an outer dimension of the shunt.
9. The method of claim 8 wherein heating the shape memory component comprises heating the shape memory component via the elongated body.
10. The method of claim 9 wherein the elongated body includes an expandable member transitionable between a low-profile delivery configuration and an expanded configuration, and wherein heating the shape memory component comprises expanding the expandable member and heating via the expanded expandable member.
11. The method of claim 9 wherein the elongated body includes an expandable member transitionable between a low-profile delivery configuration and an expanded configuration, and wherein the method further includes, after heating the shape memory component and altering the inner dimension associated with the lumen, selectively expanding the expandable component to further alter the inner dimension associated with the lumen.
12. The method of claim 8 wherein releasably coupling the positioning element includes directly coupling the positioning element to the shunt.
13. The method of claim 12 wherein the positioning element includes a groove, a notch, a strut, a magnet, or a tether.
14. The method of claim 12 wherein the positioning element includes a balloon.
15. The method of claim 8 wherein releasably coupling the positioning element includes coupling the positioning element to the patient tissue.