Temporary and retrievable expandable member
A temporary expandable tissue support device includes a plurality of helical filaments superimposed on top of one another to form a tubular body. A first end of the tubular body is coupled to an inner shaft, and a second end of the tubular body is coupled to an outer shaft slidably disposed over the inner shaft. Actuation of the inner and outer shafts in a first direction compresses the plurality of filaments thereby radially expanding the tubular body into an expanded configuration adapted to engage and support tissue at a treatment site without obstructing a fluid from flowing past the tubular body. Actuation of the shafts in a second direction opposite the first direction tensions the plurality of filaments thereby radially collapsing the tubular body into a collapsed configuration that is adapted to be delivered to or removed from the treatment site.
1. A method for temporarily supporting tissue at a treatment site in a patient, the method comprising:
providing a tubular body formed from a plurality of helical filaments disposed in an inner layer of filaments and an outer layer of filaments, the outer layer of filaments superimposed on top of the inner layer of filaments without interweaving therebetween,
wherein at least some of the inner layer filaments are fused with at least some of the outer layer filaments to form resilient joints that are flexible and configured to move as the tubular body is expanded or collapsed while preventing sliding of the fused filaments relative to one another,
wherein each of the plurality of helical filaments have a thickness and the resilient joints have a thickness greater than or equal to the thickness of one of the plurality of helical filaments, and wherein the thickness of the resilient joints is less than the thickness of two of the plurality of helical filaments, and the tubular body comprising a first end, a second end opposite the first end and a lumen extending therebetween,
advancing the tubular body in a collapsed configuration to the treatment site;
actuating an inner shaft in a first direction relative to an outer shaft slidably disposed over the inner shaft, wherein the first end is coupled to the inner shaft, and the second end is coupled to the outer shaft thereby compressing the plurality of helical filaments and radially expanding the tubular body into an expanded configuration that engages and supports the tissue without obstructing a fluid or a gas from flowing past the tissue;
maintaining the tubular body in the expanded configuration for a predetermined amount of time and supporting the tissue;
actuating the inner shaft in a second direction opposite the first direction relative to the outer shaft thereby tensioning the plurality of helical filaments and radially collapsing the tubular body into the collapsed configuration; and
removing the inner shaft, the outer shaft, and the tubular body from the patient.
2. The method of claim 1 , wherein the at least some of the inner layer filaments and the at least some of the outer layer filaments cross one another at a crossing point to form the resilient joints, and wherein radially expanding or radially collapsing the tubular body comprises flexing the resilient joints.
3. The method of claim 2 , wherein the two helical filaments form a crossing angle at the crossing point, and wherein radially expanding or radially collapsing the tubular body comprises changing the crossing angle up to 90 degrees during movement between the expanded configuration and the collapsed configuration.
4. The method of 1 , wherein the tubular body further comprises a therapeutic agent, the method further comprising delivering the therapeutic agent to the tissue.
5. The method of claim 4 , wherein delivering the therapeutic agent comprises delivering the therapeutic agent continuously during the predetermined time that the tubular body is maintained in the expanded configuration.
6. The method of claim 1 , further comprising a handle coupled to a proximal end of the inner shaft and a proximal end of the outer shaft, the handle further comprising an actuator, the method further comprising actuating the actuator thereby moving the inner shaft relative to the outer shaft and expanding or collapsing the tubular body.
7. The method of claim 6 , further comprising displaying a size of the tubular body with an indicator element on the handle as the actuator is being actuated.
8. The method of claim 1 , wherein radially expanding the tubular body comprises radially expanding the tubular body so that an outer diameter of the tubular body varies along a longitudinal axis of the tubular body.
9. The method of claim 8 , wherein the outer diameter is personalized to match contours of the treatment site in the patient.
10. The method of claim 1 , further comprising adjusting a position of the tubular body to a new location along the treatment site before removing the tubular body from the patient.
11. The method of claim 1 , wherein maintaining the tubular body in the expanded configuration applies a constant force to the tissue.
12. The method of claim 1 , wherein maintaining the tubular body in the expanded configuration comprises increasing an applied force to the tissue over a desired period of time.
13. The method of claim 1 , wherein maintaining the tubular body in the expanded configuration comprises supporting the tissue until the tissue remodels to a desired status.
14. The method of claim 1 , wherein actuating the inner shaft in the first direction comprises actuating the inner shaft in the first direction a plurality of times and radially expanding the tubular body into the expanded configuration a plurality of times, or wherein actuating the inner shaft in the second direction comprises actuating the inner shaft in the second direction a plurality of times and radially collapsing the tubular body into the collapsed configuration a plurality of times.
15. The method of claim 1 , further comprising causing a fluid or a gas to pass through or around the tubular body without restriction when the tubular body is in in the expanded configuration.