Needle tip shielding device and fixing arrangement

1. An IV catheter system comprising:

a catheter hub, said catheter hub comprising:

a tubular catheter attached at a proximal end to a catheter hub body;

a catheter hub cavity in fluid communication with a lumen of the tubular catheter;

a tube in fluid communication with the catheter hub cavity, said tube extending laterally from the catheter hub body;

a septum, proximal of the catheter hub cavity; and

an end cavity, proximal of the septum;

a needle hub, said needle hub comprising:

a needle extending distally from a needle hub body, a distal end zone of said needle having a bulge; and

a needle shield, said needle shield comprising:

at least one resilient arm extending distally from a base plate, said base plate having a through hole for receiving the needle therethrough;

wherein the needle hub is arranged in the catheter hub, such that the needle is slidingly arranged through said septum and in the lumen of said catheter, such that the needle may be withdrawn proximally from the catheter hub;

wherein the needle shield is arranged to be entirely housed in the end cavity in a retained manner through direct interaction between the needle shield and an inner wall of the catheter hub body in said end cavity, and onto the needle, such that the at least one arm rests upon and is spring loaded by the needle, and the needle is slidingly arranged within the through hole of the base plate, in an assembled state; and

wherein the bulge interacts with the base plate when the needle hub is withdrawn from the catheter hub to release the needle shield from the catheter hub and with the at least one arm covering a tip of the needle while the septum provides a seal, thereby forming a closed system in a released state.

2. The IV catheter system according to claim 1 , wherein the catheter hub comprises a tube connector extending laterally from the catheter hub body, and the tube in turn is attached to the tube connector.

3. The IV catheter system according to claim 1 , wherein a proximal end of the end cavity is provided with a ridge.

4. The IV catheter system according to claim 1 , wherein the catheter hub body is manufactured in polycarbonate or a copolymer of polycarbonate and polyester.

5. The IV catheter system according to claim 1 , wherein the catheter hub body is injection molded.

6. The IV catheter system according to claim 1 , wherein the septum is made of silicone or rubber.

7. The IV catheter system according to claim 1 , wherein the tube is made of polyvinyl chloride or ethylene vinyl acetate.

8. The IV catheter system according to claim 1 , wherein a proximal end of the catheter hub body cooperates with a distal end of the needle hub body in the assembled state.

9. The IV catheter system according to claim 1 , wherein a distal connective flange of the needle hub body cooperates with an outer proximal surface of the catheter hub body in a retaining manner.

10. The IV catheter system according to claim 1 , wherein the needle shield cooperates with the inner wall of the catheter hub body in the end cavity through a periphery of the base plate, and

wherein the at least one arm snaps centrally to cover the needle tip in response to the needle tip passing proximally of the at least one arm.

11. The IV catheter system according to claim 1 , wherein a periphery of the base plate is provided with at least one resilient tongue, which in turn cooperates with the catheter hub body.

12. The IV catheter system according to claim 11 , wherein the at least one resilient tongue is provided with a laterally extending protuberance.

13. The IV catheter system according to claim 1 , wherein a periphery of the base plate includes 3 to 5 resilient tongues.

14. The IV catheter system according to claim 13 , wherein the 3 to 5 resilient tongues are evenly distributed on and along the periphery of the base plate.

15. The IV catheter system according to claim 1 , wherein the needle shield is a monolithic plastic body.

16. A catheter hub for an IV catheter system, said catheter hub comprising:

a tubular catheter attached at a proximal end to a catheter hub body;

a catheter hub cavity in fluid communication with a lumen of the tubular catheter;

a tube in fluid communication with the catheter hub cavity, said tube extending laterally from the catheter hub body;

a septum, proximal of the catheter hub cavity;

an end cavity, proximal of the septum;

a needle hub with a needle having a bulge; and

a needle shield with at least one resilient arm extending distally from a base plate having a through hole,

wherein the needle shield is arranged to be entirely housed in the end cavity in a retained manner through direct interaction between the needle shield and an inner wall of the catheter hub body in said end cavity, and onto the needle, such that the at least one arm rests upon and is spring loaded by the needle, and the needle is slidingly arranged within the through hole of the base plate, in an assembled state, and

wherein the bulge interacts with the base plate when the needle hub is withdrawn from the catheter hub to release the needle shield from the catheter hub and with the at least one arm covering a tip of the needle while the septum provides a seal, thereby forming a closed system in a released state.

17. The catheter hub according to claim 16 , wherein the catheter hub comprises a tube connector extending laterally from the catheter hub body, and the tube in turn is attached to the tube connector.

18. The catheter hub according to claim 16 , wherein a proximal end of the end cavity is provided with a ridge.

19. The catheter hub according to claim 16 , wherein the catheter hub body is manufactured in polycarbonate or a copolymer of polycarbonate and polyester.

20. The catheter hub according to claim 16 , wherein the septum is made of silicone or rubber.