Catheter head for subcutaneous administration of an active substance

• US 20010053889A1
• Filed: 08/20/2001
• Published: 12/20/2001
• Est. Priority Date: 05/14/1998
• Status: Active Grant

• Current Assignee: Roche Diabetes Care Inc. (Roche Holding AG)
• Original Assignee: Disetronic Licensing Ag (Roche Holding AG)
• Inventors: Marggi, Rolf, Butikofer, Markus
• Granted Patent: US 6,949,084 B2
• Time in Patent Office: Days
• US Class Current: 604/164.11
• CPC Class Codes: A61M 2005/1581 Right-angle needle-type devices
• CPC Class Codes: A61M 2005/1587 suitable for being connected to an infusion line after insertion into a patient
• CPC Class Codes: A61M 25/0097 characterised by the hub connectors A61M39/10
• CPC Class Codes: A61M 25/02 Holding devices, e.g. on the body
• CPC Class Codes: A61M 25/0612 Devices for protecting the needle; Devices to help insertion of the needle, e.g. wings or holders
• CPC Class Codes: A61M 39/02 Access sites

Abstract

The present invention provides a catheter head including a cannula housing, a needle holder connectable to the cannula housing and a guide sleeve associated with the needle holder for positioning and guiding a connecting needle, and for being narrowly slide-guided over a portion of said cannula housing.

Claims

1. A catheter head comprising:

a housing having a cavity extending therethrough, the cavity defining a seat;

a cannula extending from within the cavity, the cannula having a flange extending therefrom;

a retaining body secured to the housing, the retaining body having a pathway extending axially therethrough and defining a sealing surface; and

a gasket in sealing cooperation with the flange and the sealing surface.

2. The catheter head of

claim 1

, wherein the retaining body is ultrasonically welded to the housing.

3. The catheter head of

claim 2

, wherein the gasket is an O-ring.

4. The catheter head of

claim 1

, wherein the sealing surface is frusto-conical.

5. The catheter head of

claim 4

, wherein the cannula includes a frusto-conical seat which receives a portion of the sealing surface.

6. The catheter head of

claim 1

, wherein the cavity defines a ledge and the retaining body includes a flange which cooperates with the ledge to limit axial movement of the retaining body within the cavity.

7. The catheter head of

claim 1

, and further comprising a passage in communication with, and extending radially from, the cavity.

8. The catheter head of

claim 1

, and further comprising a piercing needle extending through the cavity, the retaining body, and the cannula.

9. A catheter head comprising:

a cannula housing having a cavity extending therethrough defining an internal surface and a passage in communication with the cavity;

a cannula extending from the cavity, the cannula having a flange extending radially therefrom;

a retaining body secured within the cavity and in cooperation with the internal surface to locate the flange within the cavity;

a needle holder comprising a guide sleeve axially surrounding a connecting needle; and

a guide extending from the cannula housing and cooperating with the guide sleeve to position the connecting needle into the passage.

10. The catheter head of

claim 9

, wherein the guide sleeve comprises a closed jacket surface surrounding the connecting needle.

11. The catheter head of

claim 9

, wherein an upper side of the cannula housing forms, during insertion of the connecting needle into the passage, a support and an additional slideway for the needle holder.

12. The catheter head of

claim 11

, wherein the upper side is adapted to an underside of the needle holder which is curved in cross direction to said connecting needle, the upper side thus forming said additional slideway.

13. The catheter head of

claim 9

, wherein an underside of the needle holder is mould positioned on an upper side of a rear section of the cannula housing during positioning and insertion of the connection needle.

14. The catheter head of

claim 9

, wherein the needle holder comprises an upper side symmetrical to its underside, wherein the underside and the upper side are preferably curving outwardly away from each other.

15. The catheter head of

claim 9

, wherein a piercing needle for said cannula projects through the cannula housing at an angle to the longitudinal direction of the inserted connecting needle.

16. The catheter head of

claim 9

, wherein the cannula includes a frusto-conical seat which receives a portion of the retaining body.

17. The catheter head of

claim 9

, wherein the retaining body includes a frusto-conical sealing surface.

18. The catheter head of

claim 9

, and further comprising an O-ring disposed between the retaining body and the flange.

19. The catheter head of

claim 9

, wherein the retaining body is ultrasonically welded to the interior surface.

20. The catheter head of

claim 9

, wherein the cavity defines a ledge and the retaining body includes a flange which cooperates with the ledge to limit axial movement of the retaining body within the cavity.

21. A catheter head for subcutaneous administration of a substance, comprising:

a cannula housing carrying a soft cannula to be placed in tissue and having a passage to said cannula for the substance;

a center part placed in and rigidly bonded to the cannula housing; and

means for sealing between a flange of the cannula and the center part.

22. The catheter head of

claim 21

, wherein the cannula housing comprises an underside for flush positioning on a tissue surface.

23. The catheter head of

claim 21

, wherein the means for sealing comprises an O-ring.

24. A catheter head comprising:

a housing with a cavity, wherein the cavity has an opening and an annular seat around the opening,

a soft cannula having a portion in contact with the annular seat;

means for sealing; and

a center part received in the cavity, whereby the means for sealing is lodged between the portion of the cannula and the center part.

25. The catheter head of

claim 24

, wherein the center part is shaped to fit generally closely within the cavity.

26. The catheter head of

claim 25

, wherein the portion of the cannula comprises a radially outwardly extending flange.

27. The catheter head of

claim 26

, wherein the center part comprises a single piece.

28. A method of assembling a catheter head comprising a housing having a cavity with a seat, a cannula with a flange, an O-ring and a center part, said method comprising the steps of:

positioning the cannula in the cavity so the flange is in contact with the seat;

placing the O-ring in the cavity overlying the flange;

placing the center part in the cavity to the extent that it contacts and compresses the O-ring; and

attaching center part to the housing.

29. The method according to

claim 28

, wherein said attaching is accomplished by ultrasonically welding the center part to the housing.