Medical Device with Transcutaneous Cannula Device

• US 20080215006A1
• Filed: 09/22/2005
• Published: 09/04/2008
• Est. Priority Date: 09/22/2004
• Status: Abandoned Application

• Current Assignee: Novo Nordisk A/S
• Original Assignee: Novo Nordisk A/S
• Inventors: Thorkild, Ahm
• Application Number:
  US11/663,048
• Publication Number:
  US 20080215006A1
• Time in Patent Office: Days
• US Class Current: 604/151
• CPC Class Codes: A61M 2005/14252 with needle insertion means
• CPC Class Codes: A61M 2005/1426 with means for preventing access to the needle after use
• CPC Class Codes: A61M 25/0606 "Over-the-needle" catheter assemblies, e.g. I.V. catheters
• CPC Class Codes: A61M 5/14248 of the skin patch type
• CPC Class Codes: A61M 5/16877 Adjusting flow; Devices for setting a flow rate

Abstract

The present invention generally relates to the insertion of a transcutaneous device of the type comprising a cannula (651) and a therein moveably arranged insertion needle (661), as well as the connecting of such a transcutaneous device with a fluid supply. Thus, a device is provided comprising an insertion needle and a cannula disposed on and being axially moveable relative to the insertion needle, the insertion needle comprising a proximal fluid inlet, a seal (655) being provided between the cannula and the insertion needle allowing fluid to be transported from the fluid inlet to the distal fluid outlet, wherein the insertion needle after having been used to insert the cannula is arranged at a retracted position proximally of the initial position, thereby allowing the fluid inlet to be connected to a fluid supply when it is moved from its initial to its retracted position.

Claims

1. A medical device, comprising:

a lower surface (603) adapted for application towards the skin of a subject,

a transcutaneous fluid transport device having a distal end portion (652) adapted to be arranged through the skin of the subject and having a distal fluid outlet, and a fluid inlet portion in fluid communication with the distal end portion, the fluid transport device comprising an insertion needle (661) and a cannula (651) disposed on, or in, and being axially moveable relative to the insertion needle, the insertion needle comprising a distal end (662) adapted to penetrate the skin of the subject, and a fluid inlet (663) arranged proximally from the cannula, the cannula forming the distal end portion, a seal (655) being provided between the cannula and the insertion needle allowing fluid to be transported from the fluid inlet to the distal fluid outlet,

wherein the fluid transport device has;

an initial state in which the cannula and the insertion needle are retracted relative to the lower surface, the fluid inlet being arranged at an initial position,

an intermediate state in which the cannula and the insertion needle are extended relative to the lower surface with the distal end of the insertion needle projecting relative to the distal end of the cannula thereby allowing the fluid transport device to be introduced through the skin of the subject, and

an extended state in which the cannula extends relative to the lower surface with the distal end of the insertion needle being retracted relative to the distal end of the cannula, the fluid inlet being arranged at a retracted position proximally of the initial position,

thereby allowing the fluid inlet to be connected to a fluid supply (690) when it is moved from its initial to its retracted position.

2. A medical device as defined in claim 1, wherein the insertion needle has a pointed or cutting proximal end with the fluid inlet being arranged in the vicinity thereof, a distal fluid outlet arranged distally of the seal and a fluid conduit therebetween.

3. A medical device as defined in claim 2, wherein the insertion needle fluid inlet and outlet are formed corresponding to the ends of the insertion needle, the fluid conduit being formed by a bore along the length of the insertion needle.

4. A medical device as defined in claim 1, wherein the fluid transport device has a further, retracted state in which the cannula and the insertion needle are retracted relative to the lower surface.

5. A medical device as defined in any of claim 1, further comprising a coupling (31) for releasably securing the medical device to a mating structure comprising a fluid supply.

6. A medical device as defined in any of claim 1, further comprising a drug delivery assembly comprising:

a reservoir (460) adapted to contain a liquid drug,

a fluid outlet adapted to be arranged in fluid communication with the fluid inlet of the insertion needle, and

expelling means (470) for, in a situation of use, expelling a drug out of the reservoir and through the skin of the subject via the fluid transport device.

7. A medical device as defined in any of claim 1, in combination with a pump unit (5, 450) comprising:

a reservoir (460) adapted to contain a liquid drug,

a fluid outlet adapted to be arranged in fluid communication with the fluid inlet of the insertion needle, and

expelling means (460) for, in a situation of use, expelling a drug out of the reservoir and through the skin of the subject via the fluid transport device,

wherein the medical device and the pump unit comprise mating coupling means (31, 51) allowing the pump unit to be releasable attached to the medical device.

8. A medical device as defined claim 1, wherein the lower surface is a mounting surface adapted for application on the skin of the subject, the attaching means being adhesive means provided on the mounting surface for securing the mounting surface to the skin.

9. A medical device as defined in claim 1, wherein the cannula is soft and flexible and made from a polymeric material.

10. A medical device, comprising:

a lower surface (503, 603) adapted for application towards the skin of a subject,

a transcutaneous fluid transport device having a distal end portion adapted to be arranged through the skin of the subject and having a distal fluid outlet, and a fluid inlet portion in fluid communication with the distal end portion, the fluid transport device comprising an insertion needle (561, 661) and a cannula (551, 651) disposed on and being axially moveable relative to the insertion needle, the insertion needle comprising a pointed distal end, the cannula forming the distal end portion,

wherein the fluid transport device has;

an initial state in which the cannula and the insertion needle are retracted relative to the lower surface,

an actuated state in which the cannula and the insertion needle are extended relative to the lower surface with the distal end of the insertion needle projecting from a distal opening in the cannula thereby allowing the fluid transport device to be introduced through the skin of the subject,

an extended state in which the cannula extends relative to the lower surface with the distal end of the insertion needle being retracted from the distal opening in the cannula, and

a retracted state in which the cannula and the insertion needle are retracted relative to the lower surface.

11. A method comprising the steps of:

providing a medical device having a housing with a lower surface, a reservoir, and a transcutaneous fluid transport device comprising a hollow insertion needle (561, 661) and a cannula (551, 651) disposed on and being axially moveable relative to the insertion needle, the insertion needle comprising a proximal end and a pointed distal end,

actuating the transcutaneous fluid transport device from an initial state in which the cannula and the insertion needle are retracted relative to the lower surface, to an intermediate state in which the cannula and the insertion needle are extended relative to the lower surface with the distal end of the insertion needle projecting relative to the distal end of the cannula thereby allowing the fluid transport device to be introduced through the skin of the subject, and further to an extended state in which the cannula extends relative to the lower surface with the distal end of the insertion needle being retracted relative to the distal end of the cannula, and

retracting the insertion needle to a position proximal of the initial position to thereby connect the insertion needle with the reservoir.

12. A method as in claim 11, wherein the insertion needle is retracted relative to the distal end of the cannula before the cannula has been fully extended relative to the housing.

13. A method as in claim 11, wherein the needle is arranged either within the cannula or outside the cannula.