CATHETER INSTRUMENT AND CATHETER HUB THEREFORE

1 . A catheter unit for use in an intravenous catheter instrument, said catheter unit comprising:

a catheter hub; and

a catheter extending distally from the catheter hub, said catheter having a lumen being in flow communication with an interior cavity of the catheter hub;

wherein the interior cavity is provided with a cooperation groove at a proximal zone of the interior cavity.

2 . The catheter unit according to claim 1 , wherein the proximal zone extends distally 0.75 mm from a proximal end of the interior cavity.

3 . The catheter unit according to claim 1 , wherein the proximal zone extends distally 0.45+/−0.05 mm from a proximal end of the interior cavity.

4 . The catheter unit according to claim 1 , wherein the depth of the cooperation groove is 0.05 to 0.1 mm.

5 . The catheter unit according to claim 1 , wherein the cooperation groove extends radially in for of a ring on the inside of the catheter hub.

6 . A catheter instrument comprising:

a catheter unit, including a catheter hub and a catheter;

a spring clip needle tip shielding device; and

a needle unit;

wherein the spring clip needle tip shielding device includes:

a base plate with a hole extending there through and

at least one resilient arm extending at an attachment point at said base plate;

wherein said at least one resilient arm has a resting state, from which it may be urged to yield free passage through said hole in an axial direction of said base plate in a tension state, said at least one resilient arm being adapted for clamping a needle tip of a needle extending through said hole when said resilient arm is in said resting state;

wherein said needle unit comprises a needle hub and a needle with a needle shaft and a needle tip extending distally from the needle hub;

said needle hub being connected to the proximal end of the catheter hub and said needle shaft being arranged in the lumen of the catheter, in a ready position of said catheter instrument, and

said spring clip needle tip shielding device being arranged inside the interior cavity of the catheter hub, and said needle being arranged through said hole with the resilient arm being urged into its tension state by said needle shaft.

7 . The catheter instrument according to claim 6 , wherein tongues with knobs on said base plate cooperates releasably with a cooperation groove at a proximal zone of the interior cavity of the catheter hub.

8 . The catheter instrument according to claim 7 , wherein the proximal zone extends distally about 0.75 mm from a proximal end of the interior cavity.

9 . The catheter instrument according to claim 7 , wherein the proximal zone extends distally about 0.45 mm from a proximal end of the interior cavity.

10 . The catheter instrument according to claim 7 , wherein the depth of the cooperation groove is 0.05 to 0.1 mm.

11 . The catheter instrument according to claim 7 , wherein the cooperation groove extends radially in for of a ring on the inside of the catheter hub.

12 . A device comprising:

a base plate with a hole extending there through; and

at least one resilient arm extending at an attachment point at said base plate;

said at least one resilient arm having a resting state, from which it may be urged to yield free passage through said hole in an axial direction of said base plate in a tension state, said at least one resilient arm being adapted for clamping a needle tip of a needle extending through said hole when said resilient arm is in a resting state,

wherein said shielding device is configured to be arranged in an interior cavity of a catheter hub, and with a needle being arranged through said hole with the resilient arm being urged into a tension state by a needle shaft.

13 . The device according to claim 12 , wherein at least one tongue with knobs on said base plate are configured to cooperate releasably with a cooperation groove at a proximal zone of the interior cavity of the catheter hub.

14 . The device according to claim 13 , wherein the proximal zone extends distally about 0.75 mm from a proximal end of the interior cavity.

15 . The device according to claim 13 , wherein the proximal zone extends distally about 0.45 mm from a proximal end of the interior cavity.

16 . The device according to claim 13 , wherein the depth of the cooperation groove is 0.05 to 0.1 mm.

17 . The device according to claim 13 , wherein the cooperation groove extends radially in for of a ring on the inside of the catheter hub.