CANNULA SYSTEM AND METHOD FOR IMMOBILIZING AN IMPLANTED CATHETER DURING CATHETER ANCHORING

• US 20120083742A1
• Filed: 09/28/2011
• Published: 04/05/2012
• Est. Priority Date: 10/05/2010
• Status: Active Grant

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Nelson, Brian D.
• Granted Patent: US 9,113,949 B2
• Time in Patent Office: Days
• US Class Current: 604/175
• CPC Class Codes: A61B 17/3403 Needle locating or guiding means guides for suture needles A61B17/0482; guiding or tracking by nuclear magnetic resonance G01R33/285
• CPC Class Codes: A61B 17/3415 for introducing tubes or catheters, e.g. gastrostomy tubes, drain catheters A61B17/3417 takes precedence; body piercing catheter guide needles A61M25/06
• CPC Class Codes: A61B 2017/3407 including a base for support on the body
• CPC Class Codes: A61B 2017/347 Locking means, e.g. for locking instrument in cannula
• CPC Class Codes: A61B 90/11 with guides for needles or instruments, e.g. arcuate slides or ball joints
• CPC Class Codes: A61M 2210/0687 Skull, cranium
• CPC Class Codes: A61M 2210/0693 Brain, cerebrum
• CPC Class Codes: A61M 25/0662 Guide tubes

Abstract

Devices, systems, and methods for immobilizing an implanted catheter tip while the catheter is anchored relative to surrounding tissue. In one embodiment, a cannula system is included that incorporates a cinch tube for guiding the catheter to a target site within a body. The cinch tube may define a cinch window to receive therein a cinch member operable to immobilize and occlude the catheter. The cinch tube may also include an elongate opening proximate the cinch window. The elongate opening allows extraction of a portion of the catheter and subsequent severing of the catheter above the cinch window/occlusion site.

Claims

1. A cannula system for immobilizing a device within a mammalian body while the device is anchored to surrounding tissue, the system comprising:

a guide tube comprising a body fixable to a surgical apparatus;

an elongate cinch tube comprising an outer surface and an inner surface, the cinch tube configured to slidably engage the guide tube; and

a cinch member comprising a clamp element configured to engage the cinch tube and immobilize the device relative to the cinch tube when the device is positioned within the cinch tube.

2. The system of claim 1, wherein the cinch tube defines a cinch window formed between the inner and outer surfaces near a distal end of the cinch tube.

3. The system of claim 1, wherein the cinch tube further defines an elongate opening formed between the inner and outer surface, the opening formed along a longitudinal section of the cinch tube.

4. The system of claim 1, further comprising a friction member positioned between the guide tube and the cinch tube.

5. The system of claim 1, further comprising a lock member configured to lock the cinch tube relative to the guide tube at one of a plurality of locations.

6. The system of claim 5, wherein the cinch tube defines a plurality of receiver locations for receiving the lock member.

7. The system of claim 1, wherein the cinch member further comprises a second clamp element configured to press against the outer surface of the cinch tube.

8. A cannula system for immobilizing a tip of a catheter relative to a target site located within a mammalian skull while the catheter is being secured relative to a burr hole aligned with the target site, the system comprising:

a guide tube comprising a body fixable relative to a surgical apparatus located outside of the burr hole, and an elongate tubular extension protruding from the body of the guide tube towards the target site;

an elongate cinch tube comprising an inner surface and an outer surface, the inner surface configured to slidably receive the extension therein, wherein a cinch window is formed between the inner and outer surfaces near a distal end of the cinch tube;

a catheter configured for insertion through both the guide tube and the cinch tube; and

a cinch member comprising a first clamp element configured to pass through the cinch window and compress the catheter against the inner surface of the cinch tube.

9. The system of claim 8, wherein the cinch tube also comprises a tubular body and a tubular extension extending from the body of the cinch tube towards the target site, the cinch window being formed in the tubular extension of the cinch tube, and further wherein the cinch tube defines an elongate opening formed along a longitudinal section of the tubular extension of the cinch tube proximate the cinch window.

10. The system of claim 8, further comprising a friction member positioned between the guide tube and the cinch tube.

11. The system of claim 8, wherein the cinch tube comprises a tubular protrusion extending from the body of the cinch tube towards the guide tube, the tubular protrusion defining one or more windows passing through the tubular protrusion.

12. The system of claim 11, further comprising an O-ring surrounding the tubular protrusion and extending inwardly through the one or more windows of the tubular protrusion.

13. The system of claim 8, wherein the cinch member further comprises a second clamp element, the first and second clamp elements configured to pinch the catheter against a portion of the cinch tube.

14. The system of claim 8, further comprising a fastener configured to threadably engage the guide tube and selectively lock the cinch tube in a position relative to the guide tube.

15. The system of claim 14, wherein the cinch tube defines a plurality of threaded apertures each operable to receive the fastener.

16. A method of implanting a therapy delivery catheter and immobilizing the catheter while the catheter is coupled to an infusion source, the method comprising:

implanting the catheter such that a distal tip of the catheter is located at a predetermined target site, the catheter at least partially supported by a cinch tube;

applying a clamping member to the catheter at a cinch location associated with the cinch tube, wherein the clamping member is configured to both occlude a lumen defined by the catheter, and restrain the catheter relative to the cinch tube at the cinch location;

severing the catheter at a cut location between the cinch location and a proximal end of the catheter;

connecting the catheter to the infusion source; and

removing the clamping member.

17. The method of claim 16, further comprising displacing a portion of the catheter extending between the proximal end and the cinch location while restraining the catheter with the clamping member at the cinch location.

18. The method of claim 16, wherein connecting the catheter to the infusion source comprises connecting the catheter, after severing the catheter at the cut location, to a delivery pin slidably attached to a burr hole anchor located proximate the cinch tube.

19. The method of claim 18, further comprising cutting the catheter with a cutting module attached to the anchor before connecting the catheter to the delivery pin.

20. The method of claim 18, further comprising priming the delivery pin with fluid prior to connecting the catheter to the delivery pin.