Optically guided system for precise placement of a medical catheter in a patient
View Patent ↗A system is provided comprising an optically-guided catheter having a proximal end, a distal end, and at least one lumen. A light-emitting means is coupled to the catheter, the catheter is inserted into place in the patient, and light is emitted as a point or points from a selected location, usually the distal tip, of the catheter to which it is coupled. The system further comprises an external detection device that detects the transdermally projected light, emitted by the light-emitting point from within the patient, thereby indicating precise placement of the catheter within the patient.
1. A method of precisely placing a light-emitting point on an optically-guided catheter within a patient, the method comprising:
inserting the optically-guided catheter into a patient vessel of the patient;
emitting light from a light-emitting point on the catheter within the patient;
moving the light-emitting point in proximity to the patient's heart;
externally detecting light emitted from the light-emitting point on the catheter within the patient, wherein the light is transdermally projected from within the patient;
observing changes in pattern of emitted light as the light-emitting point approaches the patient's heart;
determining location of the light-emitting point within the patient, based upon the externally detected light; and
determining placement of the catheter within the patient, based upon location of the light-emitting point;
wherein in proximity to the heart, the emitted light fluctuates in intensity synchronously with heart beats, thereby indicating the location of the distal end of the optically-guided catheter within the patient vessel in relation to the patient's heart.
2. The method according to claim 1 , wherein the detecting is performed using a detection device.
3. The method according to claim 2 , wherein the detecting comprises photodetecting.
4. The method according to claim 2 , wherein the detecting further comprises filtering the emitted light by a filter coupled to the detection device.
5. The method according to claim 4 , wherein the filter is a narrow band interference filter.
6. The method according to claim 2 , wherein the detection device comprises night vision goggles.
7. The method according to claim 1 , wherein emitting the light utilizes a waveguide extending from a light source to the light-emitting point.
8. The method according to claim 7 , wherein the light source is an LED or LD.
9. The method according to claim 7 , wherein the light has a wavelength in the range of 620 nm to 1500 nm.
10. The method according to claim 7 , wherein the waveguide comprises an optical fiber.
11. The method according to claim 1 , wherein emitting the light further comprises coupling a light source at the light emitting point on the catheter, and generating the light therefrom.
12. The method according to claim 11 , wherein the light source is an LED or LD.
13. The method according to claim 1 , wherein the optically-guided catheter is a peripherally inserted central catheter, inserted into a blood vessel leading to the heart of the patient, and wherein the emitted-light is emitted from the distal end of the peripherally inserted central catheter.
14. The method according to claim 13 , wherein the method further comprises: observing a marked occlusion of emitted light from the distal end of the peripherally inserted central catheter when the peripherally inserted central catheter end is advanced within the vessel and enters into the patient's heart; observing return of the emitted light to its non-occluded state when the distal end of the peripherally inserted central catheter is withdrawn into the vessel from the heart muscle; and based upon observed qualitative changes in the emitted light, rapidly confirming placement of, or changing placement of, the optically-guided peripherally inserted central catheter in the patient.