Split and side-ported catheter devices

1. A catheter comprising:

a flexible elongate member comprising a sidewall having a wall thickness of not more than 0.004 inches, the sidewall forming a single lumen between a first end and a second end, and an opening at each of the first end and the second end, a proximal one of said openings connected to a wedge; the elongate member having a length between said first and second ends for insertion of the second end into a dermal layer of a patient;

wherein the first end of the elongate member is in fluid communication with an infusion pump that pumps fluid through the catheter at a predetermined flow rate and at a pressure below a cracking pressure when the second end of the elongate member is not occluded;

a primary fluid pathway through the elongate member between the opening at the first end and the opening at the second end of the elongate member; the primary fluid pathway having a proximal end in fluid communication with a fluid reservoir and permitting fluid to flow through the primary fluid pathway and to exit the second end while the pressure is below the cracking pressure; and

a secondary fluid pathway in fluid communication with the primary fluid pathway;

wherein the secondary fluid pathway comprises one or more side flaps in the sidewall of the elongate member, the one or more side flaps configured to release, depending on their number, size and location on the elongate member, controlled amounts of fluid into the skin of a patient, the secondary fluid pathway permitting increased flow of fluid through the secondary fluid pathway into the dermal layer of the patient by increasing in size if the primary fluid pathway is occluded at the second end of the elongate member such that pressure of the fluid exceeds the cracking pressure;

wherein the one or more side flaps are formed by two line segments joined at one end of each line segment, the two line segments having bilateral symmetry with respect to a primary axis of the catheter;

wherein the one or more side flaps remain closed while fluid pressure in the primary fluid pathway is below the cracking pressure, and open when the fluid pressure in the primary fluid pathway exceeds the cracking pressure; and

wherein the one or more side flaps have a circumferential length of 60-120 degrees of a circumference of the catheter.

2. The catheter as claimed in claim 1 , wherein fluid introduced into the opening at the first end flows out of the catheter via one or both of the opening at the second end and the secondary fluid pathway.

3. The catheter as claimed in claim 1 , wherein the one or more flaps are positioned at the second end.

4. The catheter as claimed in claim 3 , wherein the one or more flaps is or are positioned on the sidewall, between the openings of the first and second ends.

5. The catheter as claimed in claim 3 , wherein the one or more flaps are staggered along a length of the sidewall.

6. The catheter as claimed in claim 1 , wherein the catheter is configured to be used with an infusion set.

7. The catheter as claimed in claim 1 , wherein the catheter comprises plastic material.

8. The catheter of claim 1 , wherein the secondary fluid pathway is normally closed, and opens when fluid within the catheter exceeds the cracking pressure, and closes when the fluid within the catheter decreases below the cracking pressure.

9. A catheter comprising:

an elongate member comprising a sidewall having a thickness not more than 0.004 inches, a first end and a second end, and an opening at each of the first end and the second end, a proximal one of said openings connected to a wedge; the elongate member having a length between said first and second ends for insertion of the second end into a dermal layer of a patient;

a primary fluid pathway through the elongate member between the opening at the first end and the opening at the second end of the elongate member; the primary fluid pathway having a proximal end in fluid communication with an infusion pump that pumps fluid through the catheter and out the second end at a predetermined flow rate and while below a cracking pressure when the second end is not occluded;

and

a secondary fluid pathway in fluid communication with the primary fluid pathway;

wherein the secondary fluid pathway comprises a self-closing opening in the sidewall of the elongate member; the secondary fluid pathway permitting fluid flow by increasing in size if the primary fluid pathway is occluded at the second end of the elongate member such that pressure of the fluid exceeds the cracking pressure;

wherein the self-closing opening is configured as a flap formed by two line segments joined at one end of each line segment, the two line segments having bilateral symmetry with respect to a primary axis of the catheter;

wherein the flap has a circumferential length of 60-120 degrees of a circumference of the catheter; and

wherein the self-closing opening remains closed while fluid pressure in the primary fluid pathway is below the cracking pressure, and opens when the fluid pressure in the primary fluid pathway exceeds the cracking pressure.

10. The catheter as claimed in claim 9 , wherein if fluid exceeds the cracking pressure, the self-closing opening opens to permit the fluid to flow out of the secondary fluid pathway, and when the pressure of the fluid in the primary fluid pathway decreases below the cracking pressure, the self-closing opening closes.

11. The catheter as claimed in claim 9 , wherein fluid introduced into the opening at the first end flows out of the catheter via one or both of the opening at the second end and the secondary fluid pathway.

12. The catheter as claimed in claim 9 , wherein the secondary fluid pathway comprises a plurality of slits.

13. The catheter as claimed in claim 9 , wherein the secondary fluid pathway further comprises a side port.

14. The catheter as claimed in claim 13 , wherein the side port is positioned at the second end.

15. The catheter as claimed in claim 9 , wherein the secondary fluid pathway further comprises a plurality of side ports.

16. The catheter as claimed in claim 15 , wherein the side ports are positioned at the second end.

17. The catheter as claimed in claim 15 , wherein the side ports are positioned on the sidewall, between the openings of the first and second ends.

18. The catheter as claimed in claim 15 , wherein the side ports are staggered along a length of the sidewall.

19. The catheter as claimed in claim 9 , wherein the catheter is configured to be used with an infusion set.

20. The catheter as claimed in claim 9 , wherein the catheter is flexible.

21. The catheter as claimed in claim 20 , wherein the catheter comprises plastic material.

22. A method of administering infusate via a catheter, comprising the steps of:

providing the catheter comprising a flexible elongate member comprising a sidewall having a thickness not more than 0.004 inches, the sidewall forming a single lumen between a first end and a second end, and an opening at each of the first end and the second end, a primary fluid pathway through the elongate member between the openings of the first end and the second end of the elongate member; the primary fluid pathway having a proximal end in fluid communication with an infusion pump or fluid reservoir, and a secondary fluid pathway in fluid communication with the primary fluid pathway,

permitting fluid to flow through the primary fluid pathway and out the second end while a fluid pressure is below a cracking pressure;

wherein the secondary fluid pathway comprises one or more flaps in the sidewall of the elongate member, the flaps configured to release controlled amounts of infusate, depending on their number, size and location on the elongate member, into the skin of a patient;

inserting the catheter into a dermal layer of a patient; and

administering infusate to the patient from the infusion pump or fluid reservoir at a predetermined flow rate and below the cracking pressure when the second end is not occluded via the primary fluid pathway of the catheter while a fluid pressure within the primary fluid pathway is below the cracking pressure and the one or more flaps remain closed; and

continuing to administer infusate to the patient via the secondary fluid pathway if fluid pressure within the primary fluid pathway exceeds the cracking pressure by opening the one or more flaps and increasing a size of at least one of the one or more flaps;

wherein the one or more flaps are formed by two line segments joined at one end of each line segment, the two line segments having bilateral symmetry with respect to a primary axis of the catheter; and

wherein the one or more flaps have a circumferential length of 60-120 degrees of a circumference of the catheter.

23. A method of administering infusate via a catheter, comprising the steps of:

providing the catheter comprising a flexible elongate member comprising a sidewall having a thickness of not more than 0.004 inches, a first end and a second end, and an opening at each of the first end and the second end, a proximal one of said openings connected to a wedge, a primary fluid pathway through the elongate member between the opening at the first end and the opening at the second end of the elongate member; the primary fluid pathway having a proximal end in fluid communication with an infusion pump that pumps fluid through the catheter at a predetermined flow rate and below a cracking pressure when the second end is not occluded, and a secondary fluid pathway in fluid communication with the primary fluid pathway, wherein the secondary fluid pathway comprises a self-closing opening in the sidewall of the elongate member;

inserting the catheter into dermal layer of a patient; and

administering infusate to the patient through the primary fluid pathway and out the second end of the catheter while fluid pressure within the primary fluid pathway is below the cracking pressure and the self-closing opening is closed; and

continuing to administer infusate to the patient via the secondary fluid pathway if fluid pressure within the primary fluid pathway exceeds the cracking pressure by opening the self-closing opening and increasing a size of the self-closing opening;

wherein the self-closing opening is configured as a flap formed by two line segments joined at one end of each line segment, the two line segments having bilateral symmetry with respect to a primary axis of the catheter; and

wherein the flap has a circumferential length of 60-120 degrees of a circumference of the catheter.

24. A method of administering infusate via a catheter, comprising the steps of:

providing the catheter comprising a primary fluid pathway through a flexible elongate member; the primary fluid pathway having a proximal end in fluid communication with an infusion pump that pumps fluid through the catheter at a predetermined flow rate and below a cracking pressure when a distal end of the elongate member is not occluded, the elongate member connected at the proximal end to a wedge, a secondary fluid pathway in fluid communication with the primary fluid pathway, the secondary fluid pathway comprising a self-closing opening at a sidewall of the elongate member;

inserting the catheter into a dermal layer of a patient; and

administering infusate to the patient through the primary fluid pathway and out the distal end of the elongate member while fluid pressure within the primary fluid pathway is below a cracking pressure and the self-closing opening is closed; and

continuing to administer infusate to the patient via the secondary fluid pathway if fluid pressure within the primary fluid pathway exceeds the cracking pressure by opening the self-closing opening and increasing a size of the self-closing opening;

wherein the self-closing opening is configured as a flap formed by two line segments joined at one end of each line segment, the two line segments having bilateral symmetry with respect to a primary axis of the catheter;

wherein the catheter has a sidewall having a thickness of not more than 0.004 inches; and

wherein the one or more flaps have a circumferential length of 60-120 degrees of a circumference of the catheter.