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1. (WO1990006144) APPAREIL DE PERFUSION
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

CLAIMS

1. Infusion apparatus comprising pressure limiting means limiting pressure in the infusion line at the infusion site.

2. Apparatus according to claim 1, adapted to limit pressure at the infusion site to a value only just above peak venous or arterial pressure.

3. Apparatus according to claim 1, said pressure limiting means comprising valve means located in the infusion line at the infusion site.

4. Apparatus according to claim 3 , said valve means being sensitive to pressure in the infusion line and operative to restrict the infusion line against flow to the infusion site-.

- Apparatus according to claim 4, said valve means being operative to close the infusion line against flow to the infusion site.

6. Apparatus according to claim 5 , adapted to latch closed against pressure in the infusion line.

7. Apparatus according to claim 3, in which said valve means are adjustable to set the limiting pressure.

8. Apparatus according to claim 1, comprising a valve controlled by a diaphragm exposed to infusion line pressure and connected to move a valve member against a valve seat.

9. Apparatus according to claim 8, in which the diaphragm is in a valve body having an inlet for
connection to an infusion source and an outlet for connection to the infusion site and divides the valve body into line pressure and reference pressure chambers.

10. Apparatus according to claim 9, in which the reference pressure chamber is open to atmosphere.
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11. Apparatus according to claim 9, in which the valve member comprises a valve head on a stem attached to the diaphragm, the stem being directed towards the inlet and the valve seat being intermediate the head and the diaphragm, the stem projecting through it.

12. Apparatus according to claim 9, in which the valve head is designed to spread under the influence of pressure forcing it against the valve seat so as to confirm its sealing action against the valve seat.

13. Apparatus according to claim 11, in which the valve head can be resiliently inserted through the valve seat for assembly of the valve.

14. Apparatus according to claim 7, in which the diaphragm is stiffened.

15. Apparatus according to claim 7 , in which the diaphragm has a restricted travel to reinforce the valve against excess pressure forcing the valve member through the valve seat.

16. Apparatus according to claim 1, comprising indicator means indicating actuation of the pressure limiting means .

17. Apparatus according to claim 16 , comprising an integral electric switch for operating an alarm circuit.

18. Infusion apparatus comprising a pump supplying an infusion line, infusion site pressure limiting means in the infusion line limiting pressure at the infusion site, and pump pressure limiting means operative at the pump to prevent excess build up of pressure in the line when the infusion site pressure limiting means operates to limit pressure at the infusion site.

19. Apparatus according to claim 18, said pump pressure limiting means operating to stop or bypass the pump.

20. Apparatus according to claim 19, said pump pressure limiting means being integrally contained in the pump.