Cranial bolt

• US 6,623,490 B1
• Filed: 02/12/2001
• Issued: 09/23/2003
• Est. Priority Date: 10/02/1998
• Status: Expired due to Fees

• Current Assignee: Medtronic Minimed Incorporated (Medtronic Plc)
• Original Assignee: Diametrics Medical Limited (Allegro Biodiesel Corp.)
• Inventors: Markle, David R., Irvine, Michael P., Crane, Barry C.
• Primary Examiner(s): Robert, Eduardo C.
• Application Number:
  US09/762,634
• Time in Patent Office: 953 Days
• Field of Search: 606/108, 606/53, 606/213, 606/218, 604/104, 604/164.03, 604/164.04, 604/164.06, 604/264, 604/523, 604/533, 604/158
• US Class Current: 606/108
• CPC Class Codes: A61M 2039/025 through bones or teeth, e.g. through the skull
• CPC Class Codes: A61M 2039/0261 Means for anchoring port to the body, or ports having a special shape or being made of a specific material to allow easy implantation/integration in the body
• CPC Class Codes: A61M 2039/0267 comprising sensors or electrical contacts
• CPC Class Codes: A61M 2210/0693 Brain, cerebrum
• CPC Class Codes: A61M 39/0247 Semi-permanent or permanent transcutaneous or percutaneous access sites to the inside of the body peritoneal dialysis catheters A61M1/285; tracheostomy devices A61M16/0465; measuring pressure within the body A61B5/03; colostomy devices A61F5/445; gastrotomy feeding tubes A61J15/0015; means for fixing a feeding tube outside of the body A61J15/0053

Abstract

A cranial bolt for connecting one or more elongate, flexible members such as catheters with the interior of the skull, wherein the bolt includes a hollow shank having one threaded end and a second end opposite the threaded end for receiving one or more elongate members. Each member is retained in the second end and communicates with a passageway in the shank extending to the threaded end.

Claims

1. A device for accessing an interior of a skull comprising:

(a) a cranial bolt comprising a hollow shank having a first threaded end to engage an opening in the skull and a second end;

the shank defining a plurality of internal passageways; and

(b) a plurality of tubes received and fixed within said second end of said shank;

(i) each of said tubes communicating with a separate one of said internal passageways in the shank;

(ii) each of the tubes comprising tubular guides through which catheters or sensors can be guided to a desired location within the skull; and

(iii) each of the tubes including a proximal securing device to fix the catheters or sensors in said desired location.

2. A device according to claim 1 further comprising:

(a) a flexible collar connected to the second end of the shank;

the flexible collar containing said tubes.

3. A device according to claim 1 wherein:

(a) the tubes comprise a multi-lumen catheter which is fixed in the second end of the shank;

(i) wherein each individual lumen of the multi-lumen catheter are aligned with one of said internal passageways in the shank.

4. A device according to claim 1 wherein:

(a) said tubes are fixed in the shank by an adhesive.

5. A device according to claim 1 further comprising:

(a) a plastic body member receiving said shank;

the plastic body member having wing-like extensions to facilitate screwing bolt into the skull.

6. A device according to claim 5 wherein:

(a) the plastic body member is moulded on the shank.

7. A device according to claim 1 wherein:

(a) the plurality of internal passageways defined by said shank includes;

(i) a major passageway; and

(ii) one or more further passageways smaller than said major passageway;

said one or more further passageways being disposed around said major passageway.

8. A device according to claim 7 wherein:

(a) the one or more further passageways are angled outwardly with respect to the major passageway.

9. A device according to claim 8 wherein:

(a) the one or more further passageways each have a passageway axis;

(b) the shank has a longitudinal axis; and

(i) the passageway axes are inclined to the shank longitudinal axis at an angle between 3 and 15 degrees.

10. A device according to claim 1 wherein:

(a) at least one of said tubes comprises a catheter including a sensor for assessing a desired parameter.

11. A device according to claim 1 wherein:

(a) one or more of said tubes includes an internal reinforcing spring which imparts kink resistance.

12. A device according to claim 1 wherein:

(a) the securing device for each of the tubes comprises a Luer lock.

13. A method for locating a catheter or sensor in an interior of a skull;

the skull containing a brain;

the method comprising;

(a) cutting a hole in said skull;

(b) fixing a cranial bolt having a hollow shank having a first end to engage an opening in the skull and a second end including a plurality of tubes in communication with passageways in the shank extending to the first end, said tubes being retained in said second end,

(c) guiding at least one catheter or sensor through one of the tubes and through one of the passageways in the shank,

(d) adjusting the position of the catheter or sensor relative to the bolt so as to locate a distal end of the catheter or sensor at a desired position in an interior of the brain, and

(e) fixing said catheter or sensor at said desired position using a securing mechanism located remote from the shank.

14. A method according to claim 13 wherein:

(a) said step of fixing said catheter or sensor at said desired position includes using a Luer lock to fix said catheter or sensor at said desired position remote from the shank.

15. A method for locating a plurality of catheters or sensors in an interior of a skull;

the skull containing a brain;

the method comprising;

(a) cutting a hole in said skull;

(b) fixing a cranial bolt having a hollow shank having a first end to engage an opening in the skull and a second end including a plurality of tubes in communication with passageways in the shank extending to the first end, said tubes being retained in said second end;

(c) guiding a plurality of catheters or sensors through the tubes and through the passageways in the shank;

(d) separately adjusting the position of each catheter or sensor relative to the bolt so as to locate a distal end of each catheter or sensor at a desired position in an interior of the brain; and

(e) fixing each catheter or sensor at said desired position using a securing mechanism located remote from the shank.

16. A method according to claim 15 wherein:

(a) said step of fixing said catheter or sensor at said desired position includes using a Luer lock to fix said catheter or sensor at said desired position remote from the shank.