Adjustable flexibility stiffness intraluminal device and associated devices systems and methods

1. An elongate device for insertion into a body lumen of a patient, the elongate device comprising:

a compressible elongate member comprising a proximal portion and a distal portion;

a pair of filars extending within the compressible elongate member and affixed to the compressible elongate member;

a fixed member;

a biasing member which is spaced from the fixed member and configured to control a compressive pressure applied to the pair of filars;

wherein the filars of the pair of filars are configured to extend through the fixed member and are secured to the biasing member; and

wherein the filars of the pair of filars are configured to adjust a stiffness of the compressible elongate member while the compressible elongate member is disposed within the body lumen of the patient; and

a spring disposed at an end of the compressible elongate member and disposed between the fixed member and the biasing member; and

an imaging element disposed at the distal portion of the compressible elongate member and configured to obtain an intraluminal data associated with the body lumen.

2. The device of claim 1 , wherein the pair of filars is configured to maintain a neutral position of the compressible elongate member upon changing its stiffness.

3. The device of claim 1 , wherein the compressible elongate member comprises a lumen extending from the distal portion to the proximal portion.

4. The device of claim 3 , wherein the filars are disposed within the lumen of the compressible elongate member.

5. The device of claim 4 , wherein the filars of the pair of filars extends through the spring.

6. The device of claim 4 , wherein the spring is coupled to the biasing member.

7. The device of claim 6 , wherein the biasing member is operable to translate axially relative to the compressible elongate member.

8. The device of claim 1 , wherein the fixed member, the biasing member, and the filars of the pair of filars are configured to

reduce the stiffness of the compressible elongate member when the biasing member is in a first position.

9. The device of claim 8 , wherein the biasing member is configured to maintain the stiffness of the compressible elongate member at predetermined values.

10. The device of claim 1 , wherein the biasing member is configured to increase the stiffness of the compressible elongate member when the biasing member is in a second position.

11. The device of claim 1 , wherein the imaging element comprises an intravascular ultrasound (IVUS) transducer.

12. The device of claim 1 , wherein the compressible elongate member comprises a catheter.

13. A method, comprising:

positioning an elongate device within an anatomy of a patient, the elongate device having a longitudinal axis and comprising a plurality of filars extending along the longitudinal axis through elongate device and coupled to the elongate device, a stiffness modulator being disposed at a proximal end of the elongate device outside of the anatomy of the patient when the elongate device is positioned within the anatomy of the patient, the stiffness modulator including a fixed member, and a biasing member to which the plurality of filars are coupled under tension, the biasing member being spaced from the fixed member, wherein the plurality of filars are configured to extend through the fixed member and are secured to the biasing member; and

with the elongate device positioned within the anatomy of the patient, adjusting a flexibility of the elongate device by adjusting a longitudinal position of the biasing member to which the filars are coupled relative to the fixed member to adjust the tension of the filars which are coupled to the elongate devicei

wherein the stiffness modulator further includes a spring disposed at an end of the elongate member and disposed between the fixed member and the biasing member; and

an imaging element disposed at a distal portion of the elongate member and configured to obtain an intraluminal data associated with the anatomy.

14. The method of claim 13 , further comprising:

obtaining measurement data associated with the anatomy using a sensor of the elongate device.

15. The method of claim 13 wherein the adjusting comprises:

increasing the flexibility of the elongate device by moving the biasing member toward the fixed member to reduce the tension of the plurality of filars which are coupled to the elongate device.

16. The method of claim 15 , wherein the adjusting further comprises:

decreasing the flexibility of the elongate device by moving the biasing member away from the fixed member to increase the tension of the plurality of filars which are coupled to the elongate device.

17. The method of claim 13 , wherein the adjusting comprises applying a compressive force to the spring.

18. The method of claim 13 , wherein the adjusting comprises applying a tensile force to the spring.

19. A catheter comprising:

an elongate member configured to be inserted into a body lumen of a patient, the elongate member comprising a proximal portion and a distal portion;

a stiffening mechanism coupled to the elongate member and configured to change the stiffness of the elongate member during a medical procedure;

wherein the stiffening mechanism comprises:

a tensioning member comprising a plurality of filars extending along a longitudinal axis of the elongate member and coupled to the elongate member; and

a stiffness modulator fixedly coupled to the tensioning member and disposed at the proximal portion of the elongate member, the stiffness modulator including a fixed member, and a biasing member to which the plurality of filars are coupled under tension, the biasing member being spaced from the fixed member, the biasing member being movable relative to the fixed member to change the stiffness of the elongate member by adjusting the tension of the plurality of filars which are coupled to the elongate member, wherein the plurality of filars are configured to extend through the fixed member and are secured to the biasing member;

a spring disposed at an end of the elongate member and disposed between the fixed member and the biasing member; and

an imaging element disposed at the distal portion of the elongate member and configured to obtain an intraluminal data associated with the body lumen.