Apparatus and method for guiding catheters

• US 20070219444A1
• Filed: 11/21/2006
• Published: 09/20/2007
• Est. Priority Date: 01/14/2004
• Status: Abandoned Application

• Current Assignee: University of Guelph
• Original Assignee: University of Guelph
• Inventors: Physick-Sheard, Peter, McGurrin, Kim, Diaz, Cesar
• Application Number:
  US11/602,860
• Publication Number:
  US 20070219444A1
• Time in Patent Office: Days
• US Class Current: 600/424
• CPC Class Codes: A61B 8/0833 involving detecting or locating foreign bodies or organic structures
• CPC Class Codes: A61N 1/3956 Implantable devices for applying electric shocks to the heart, e.g. for cardioversion

Abstract

The present invention is a system for guiding catheters into chamber or conduits of the body without the use of X-ray based imaging systems. The system disclosed is used for guidance of catheters in the heart chamber and heart protruding structures and conduits by using external ultrasound and device based physiological sensory inputs to create a quasi-visual-sensory-algorithm that is used to provide clinical proper sensory and handling input so that device placement is facilitated. The method and preferred devices are designed to deliver high energy defibrillation shocks to the myocardium and also provide a stable substrate for pressure lumens and or sensors used to provide “distal specific” physiological sensory inputs.

Claims

1. A method of guiding a catheter within a mammalian body, the method comprising the steps of:

positioning a catheter into a deep body lumen or organ using an external ultrasound image as a principle guidance system but also in conjunction with pressure gradients taken from an associated internally located device having sensors or pressure lumens mounted thereon;

using the ultrasound image and pressure gradients to guide the catheter into a desired position within the body.

2. The method of claim 1, wherein the ultrasound image which is used to guide the catheter into a specific location within the body uses anatomical distinctions and guidance decisions made from specific physiological measurements made by way of the catheter based sensors.

3. The method of claim 2, further comprising the use of multi-plane ultra sound scans done using external means and pressure gradient measurements and depth markers and depth sensors mounted on the device to form a quasi-visual-sensory-algorithm (Q-VSA);

4. The method of claim 3, wherein the algorithm of depth, image and pressure gradients is used to create an expected series of measurements that provide sufficient affirmation for placement of devices within targeted anatomical locations within the body.

5. The method of claim 4, wherein a set of indwelling devices, working in tandem, are used to generate an electric field between electrodes mounted on the two devices, the devices being guided and preferentially positioned within the heart using the Q-VSA method.

6. The method of claim 5, wherein the mammalian heart is human having two sets of chambers consisting a left and right atrium and left and right ventricles.

7. The method of claim 6, wherein the mammalian heart is an equine animal.

8. The method of claim 6, wherein the mammalian heart is a canine animal.

9. The method of claim 6, wherein the mammalian heart is a feline animal.

10. The method of claim 6, wherein the mammalian heart is a bovine animal.

11. The method of claim 6, wherein the mammalian heart is a porcine animal

12. The method of claim 6, wherein the mammalian heart is a mastodon animal

13. The method of claim 6, wherein the mammalian heart is that of mammal weighing greater than about 1 kilogram.

14. The device of claim 6, wherein the Q-VSA algorithm is obtained from a device in the form of a system which is constructed into a single transportable unit that can be field ready such that veterinary medicine and military applications can be facilitated, thereby overcoming shortcomings of more cumbersome X-ray based imaging systems.

15. The device of claim 14, wherein the indwelling device is equipped with a semi-flexible high surface electrode capable of withstanding extreme high energy electrical discharges so that large mammalian hearts, such as equine heart, can be defibrillated without thermal injury.

16. The device of claim 15, wherein the indwelling device is capable of being oriented by mechanical deformation at a specific location along its length and further equipped with ultrasound/echosonograph image enhancing attributes such as bonding adhesives or additional cast markers that contain hollow or solid micro spheres made of glass, ceramic, plastic, metal or clay and are ideally suited to reflect sound waves.

17. The method of claim 16, wherein the mechanical deformation occurs at or beyond the distal ¼

section of device and the mechanically active section is further equipped with a flexible ultrasound enhancing sub-system, the sub-system being contained within the catheter and being flexible enough to also deform.

18. The method of claim 17, wherein the mechanical deformation occurs before the device is inserted into patients such that a pre-set curve on distal end of catheter is malleable and can be adjusted prior to insertion.

19. The method of claim 18, wherein the device is fashioned with a lumen hole located on the side of catheter, the lumen being coupled to an isolated lumen and positioned between 1 mm to 50 mm from distal end of catheter.

20. The method of claim 19, wherein the device is fashioned with two lumen holes on the side and/or tip of device but located to capture or frame the high surface electrode, one of the lumen holes being at least 1 mm distal of high surface electrode and the second lumen hole being at least 1 mm proximal to high surface electrode.

21. The method of claim 20, wherein the lumen holes are coupled to independent lumen conduits for hydraulic circuit isolation.

22. The method of claim 21, wherein a selected lumen hole is coupled to a common conduit and an average pressure gradient between lumens is observed.

23. The method of claim 22, wherein the selected lumen hole is coupled to a common conduit that can be made selectively active to either lumen hole by the use of a telescoping tube that can either open or close either lumen by either blocking or allowing to stay open one, none or both of the lumen holes.

24. The method of claim 23, whereby the conduits connecting distal end lumen holes are terminated at a proximal end of the device by way of a Leur Lock™

, or similar fitting.

25. The method of claim 24, wherein depth markers are applied to the circumference of the catheter in 25 centimeter increments and each thin line demarcates a 25 mm displacement, each thick line demarcates a 50 cm displacement, and a line that indicates a location where a curve arc faces inward, so that the user can see and use the mark for additional guidance.

26. The method of claim 25, wherein the devices are packaged as a set of catheters to be used in a single patient and inclusive of valves, suture straps, introducers and other sterile materials required to treat a patient, so that ease of use is achieved.

27. The method of claim 26, wherein the high energy electrodes measure 10 cm or more and are of the size no greater than 24 French (8 mm).

28. The method of claim 27, wherein the devices are equipped with a single built-in cable that connects both high energy electrodes on the two catheters by means of a single one piece connector that is customized and fashioned to connect to defibrillators readily found in the field.

29. The method of claim 28, wherein the devices are equipped with a single built in cable that connects both distal tips of the catheters and the low energy electrode on the catheters onto a single one piece connector that is customized and fashioned to connect to defibrillators that are readily found in the field.