INFUSION PUMP WITH DRIVE DEVICE AND BLOCKING MECHANISM FOR THE INFUSION SYRINGE PISTON DRIVE HEAD

• US 20140343533A1
• Filed: 12/20/2012
• Published: 11/20/2014
• Est. Priority Date: 12/23/2011
• Status: Active Grant

• Current Assignee: B Braun Melsungen AG (B. Braun Holding GmbH & Co. KG)
• Original Assignee: B Braun Melsungen AG (B. Braun Holding GmbH & Co. KG)
• Inventors: Gerlach, Hans-Josef, Heitmeier, Rolf, Wildner, Ren
• Granted Patent: US 9,289,552 B2
• Time in Patent Office: Days
• US Class Current: 604/506
• CPC Class Codes: A61M 2005/14573 with a replaceable reservoir for quick connection/disconnection with a driving system
• CPC Class Codes: A61M 2205/276 preventing unwanted use
• CPC Class Codes: A61M 2205/332 Force measuring means
• CPC Class Codes: A61M 5/1454 spring-actuated, e.g. by a clockwork
• CPC Class Codes: A61M 5/14546 Front-loading type injectors
• CPC Class Codes: A61M 5/1456 with a replaceable reservoir comprising a piston rod to be moved into the reservoir, e.g. the piston rod is part of the removable reservoir
• CPC Class Codes: A61M 5/16831 Monitoring, detecting, signalling or eliminating infusion flow anomalies low-level float-valves causing cut-off A61M5/40; indicating or recording presence, absence or direction of flow in general G01P13/0066
• CPC Class Codes: A61M 5/172 electrical or electronic A61M5/16804, A61M5/16831 take precedence

Abstract

A drive device of an infusion syringe piston drive head for moving an infusion syringe piston is described. The device includes an advancing means including an advancing slide, an advancing spindle and a multi-part advancing spindle nut having at least one radially movable nut shell, and a blocking means adapted to be automatically triggered by a control sensor for blocking an infeed motion of the drive head in which the advancing slide is drivable by the advancing spindle nut at the advancing spindle and in which the drive head is arranged at the advancing slide, wherein the blocking means adapted to be automatically triggered by a control sensor includes the multi-part advancing spindle nut for blocking the infeed motion of the drive head on the advancing spindle.

Claims

1-16. -16. (canceled)

17. A drive device of an infusion syringe piston drive head for moving an infusion syringe piston comprising:

an advancing means including an advancing slide, an advancing spindle and a multi-part advancing spindle nut including at least one radially movable nut shell; and

a blocking means adapted to be automatically triggered by a control sensor for blocking an infeed motion of the drive head in which the advancing slide can be driven on the advancing spindle by the advancing spindle nut and in which the drive head is arranged on the advancing slide, wherein the blocking means adapted to be automatically triggered by the control sensor comprises the multi-part advancing spindle nut for blocking the infeed motion of the drive head on the advancing spindle.

18. The drive device according to claim 17, wherein the blocking means comprises an axially displaceable trigger sleeve which surrounds the advancing spindle nut on the radial outside.

19. The drive device according to claim 17, wherein the blocking means comprises means for accelerating a trigger sleeve, the accelerating means including an accelerating coil spring arranged radially outside on the trigger sleeve.

20. The drive device according to claim 17, wherein the blocking means is controllable by one sliding sleeve.

21. The drive device according to claim 17, wherein the blocking means is controllable by at least two sliding sleeves, wherein the at least two sliding sleeves are arranged to be individually drivable and/or to be sequentially movable.

22. The drive device according to claim 17, wherein the at least one radially movable nut shell includes an actuating element axially displaceable with respect to its longitudinal extension which causes radial actuation of the at least one radially movable nut shell with respect to the advancing spindle.

23. The drive device according to claim 17, wherein the at least one radially movable nut shell is at least partly surrounded radially outside by at least one sliding sleeve, wherein the at least one radially movable nut shell is radially displaceable by at least one sliding sleeve.

24. The drive device according to claim 17, wherein the at least one radially movable nut shell is at least partly surrounded radially outside by two sliding sleeves, wherein the at least one radially movable nutshell is radially displaceable by the two sliding sleeves.

25. The drive device according to claim 17, wherein the at least one radially movable nut shell includes an engaging area for engaging in a male thread of the advancing spindle and a supporting area for radially bearing on the male thread of the advancing spindle, wherein the engaging area and the supporting area are arranged axially in series.

26. The drive device according to claim 17, wherein the at least one radially movable nut shell is supported at an end side on an advancing slide bearing.

27. The drive device according to claim 17, wherein the at least one radially movable nut shell is arranged to be tilting vis-à

-vis the advancing spindle substantially transversely to its longitudinal extension.

28. The drive device according to claim 17, wherein the advancing spindle nut has a head area and a foot area the respective outer diameters of which are larger than an advancing spindle nut zone disposed between the head and foot areas.

29. The drive device according to claim 17, wherein the head area configures a ramp for axially displaceable sliding sleeves and the foot area configures a counter-bearing for at least one of the axially displaceable sliding sleeves.

30. The drive device according to claim 17, wherein the advancing means includes a parking means for intermediately parking a sliding sleeve arranged axially adjacent to the advancing spindle nut.

31. The drive device according to claim 17, wherein the advancing means comprises controllable holding solenoids for maintaining the advancing spindle nut in an opened operating position.

32. The drive device according to claim 17, wherein the control sensor is arranged in the drive head so that the blocking means can be automatically triggered upon actuation of the control sensor by a piston plate of the infusion syringe piston.

33. An infusion pump comprising a drive head for moving an infusion syringe piston of an infusion syringe arranged on an infusion pump, comprising an advancing means for driving the drive head and comprising a safety device for preventing inadvertent bolus administration, wherein the infusion pump includes a drive device in accordance with claim 17.

34. A method of operating an infusion pump in which a drive head for an infusion syringe piston of an infusion syringe is advanced by an advancing means, in which a multi-part advancing spindle nut is moved along an advancing spindle for driving the drive head and in which an actuating element triggers a safety device for preventing inadvertent bolus administration, when the drive head is moved up to the infusion syringe piston during replacement of the infusion syringe, wherein the actuating element is axially displaced along the advancing spindle, thereby the multi-part advancing spindle nut being radially moved at least partly toward the advancing spindle or being radially moved away from the advancing spindle.