Steerable fiber optic shape sensing enabled elongated medical instrument
Disclosed herein is a system, apparatus and method directed to placing a medical instrument in a vasculature of a patient body, where the medical instrument includes an optical fiber having one or more core fibers. The system also includes a console having non-transitory computer-readable medium storing logic that, when executed, causes operations of providing an incident light signal to the optical fiber, receiving a reflected light signal of the incident light, processing the reflected light signals associated with the optical fiber and determining a location of a distal tip of the medical instrument within the patient body. The medical instrument may be steerable in one of various methods including having a predetermined curvature, a distal tip that is magnetic, magnetized, metallic or ferrous and is steerable by an external magnetic device or a having a variable stiffness at a distal tip.
1. A medical instrument system for inserting a medical instrument within a patient body, the system comprising:
the medical instrument comprising an optical fiber having one or more core fibers;
a stiffening stylet;
an adjustment mechanism including a proximal collar, a distal collar, and a pair of hinged arms, wherein the proximal collar is coupled to the stiffening stylet, wherein:
actuation of the adjustment mechanism moves the proximal collar in (i) a proximal direction which moves the stiffening stylet in the proximal direction relative to a distal tip of the medical instrument, or (ii) a distal direction which moves the stiffening stylet in the distal direction relative to the distal tip of the medical instrument; and
a console including one or more processors and a non-transitory computer-readable medium having stored thereon logic, when executed by the one or more processors, causes operations including:
providing an incident light signal to the optical fiber,
receiving reflected light signals of different spectral widths of the incident light signal by the optical fiber,
processing the reflected light signals associated with the optical fiber, and
determining a location of the distal tip of the medical instrument within the patient body,
wherein the medical instrument is configured to be manipulated in order to direct the distal tip in a particular direction.
2. The system of claim 1 , wherein:
a distal portion of the medical instrument is shaped with a predetermined curvature, and
manipulating the medical instrument includes rotating the medical instrument around a longitudinal axis of the medical instrument in order to direct the distal tip in the particular direction.
3. The system of claim 1 , wherein each of the one or more core fibers includes a plurality of sensors distributed along a longitudinal length of a corresponding core fiber and each sensor of the plurality of sensors is configured to (i) reflect a particular light signal of a different spectral width based on received incident light, and (ii) change a characteristic of the reflected particular light signal for use in determining a physical state of the optical fiber.
4. The system of claim 1 , wherein the optical fiber is a single-core optical fiber, and wherein the incident light signal is provided in pulses.
5. The system of claim 1 , wherein the optical fiber is a multi-core optical fiber including a plurality of the one or more core fibers.
6. The system of claim 1 , wherein the logic, when executed by the one or more processors, causes further operations including generating a display indicating the location of the distal tip of the medical instrument within the patient body.
7. The system of claim 1 , wherein the medical instrument is one of an introducer wire, a guidewire, a stylet, a stylet within a needle, a needle with the optical fiber inlayed into a cannula of the needle or a catheter with the optical fiber inlayed into one or more walls of the catheter.
8. The system of claim 1 , wherein:
the distal tip of the medical instrument is magnetic, magnetized, metallic, or ferrous,
the system further included an external magnetic device configured for placement on the patient body, and
a magnetic field of the external magnetic device attracts or repels the distal tip.
9. The system of claim 1 , wherein the stiffening stylet has flexural stiffness that is greater than a flexural stiffness of both of a cladding of the medical instrument and the optical fiber.
10. The system of claim 1 , wherein the adjustment mechanism is configured to be actuated mechanically, manually, or electromechanically by a user.
11. The system of claim 1 , wherein:
the medical instrument is a medical instrument assembly comprising:
a first medical instrument including a lumen; and
a second medical instrument including the optical fiber,
the operations further include determining that a curvature is present in a distal tip of the medical instrument assembly, and
the curvature is formed from the second medical instrument advancing beyond a distal end of the first medical instrument.
12. The system of claim 1 , wherein the medical instrument is configured for insertion within a lumen of a medical device.
13. The system of claim 12 , wherein the medical instrument is reusable across multiple medical devices.
14. The system of claim 13 , wherein the medical instrument includes a disposable cover configured to cover the medical instrument for each use of the medical instrument.
15. The system of claim 13 , wherein the medical instrument includes a film or coating over an outer jacket of the medical instrument, the film or coating configured to be replenishable for each use of the medical instrument.
16. The system of claim 12 , wherein the medical instrument is configured to be sterilized by a dry heat, a moist heat optionally in combination with pressure, a biocide optionally in combination with pressure, radiation, or a combination thereof.
17. The system of claim 16 , wherein the medical instrument is configured to be re-sterilized between uses of the medical instrument.
18. The system of claim 12 , wherein the medical instrument further includes a medical instrument holder configured to accept the medical instrument through a through hole of the medical instrument holder, the medical instrument holder configured to hold the medical instrument therein with friction and prevent proximal movement of the medical instrument while the medical instrument is inserted within the medical device.
19. The system of claim 12 , wherein the medical instrument includes electrical circuitry and componentry configured for electrocardiogramhy, conductance measurements, or impedance measurements.