Portable infusion unit

• US 4,585,439 A
• Filed: 09/07/1984
• Issued: 04/29/1986
• Est. Priority Date: 09/07/1983
• Status: Expired due to Term

• Current Assignee: Disetronic Licensing Ag
• Original Assignee: Disetronic AG
• Inventors: Michel, Peter
• Primary Examiner(s): YASKO JR, JOHN D
• Application Number:
  US06/648,051
• Time in Patent Office: 599 Days
• Field of Search: 604/155, 604/152, 604/211, 604/208, 604/154, 74/89.15, 74/97
• US Class Current: 604/155
• CPC Class Codes: A61M 5/14244 adapted to be carried by the patient, e.g. portable on the body
• CPC Class Codes: A61M 5/14546 Front-loading type injectors

Abstract

A driver sleeve (8) is pivoted in the casing (1) of the unit which is driven by a motor controlled by a control device and supplied by a battery. A threaded rod (11) forming the piston rod of an injection ampule (15) is placed into the driver sleeve (8) in a non-rotary but longitudinally shiftable fashion. A nut (21) provided with an external toothing (20) is rigidly held on the rear end of the injection ampule (15) in the casing (1). A connecting part (27) provided with a catheter (32) receives the outlet piece (30) of the injection ampule (15) and is screwed to the casing (1) so that the exchangeable injection ampule (15) is completely surrounded by the casing (1) and the connecting part (27) and the outlet piece (30), resting close to the connecting part (27), of the injection ampule (15) communicates with the catheter (32). The threaded rod (11) is placed into the piston (14) of the injection ampule (15) with the nut (21) being screwed on and is placed into the casing (1) together with the injection ampule (15). When the driver sleeve (8) is driven, it moves, with the advancing of the piston (14), through the nut (21) held tightly in the casing (1) adjacent to the rear end of the injection ampule. The unit guarantees a reliable advance of the piston rod even with a low torque of the driving device and has only a length as required by the injection ampule and the necessary piston rod length.

Claims

1. Portable infusion unit for the automatic discharge of liquid from an exchangeable injection ampule (15;

115) with a driving device for the advance of the piston (14) of the injection ampule (15;

     115) comprising, a rotatable driver sleeve (8;

     108) connected in said unit to be rotatably driven by the driving device, a threaded rod (11) for the advance of the piston (14) of the injection ampule (15;

     115) a nut (21;

     121) threadably connected on the threaded rod (11), said threaded rod (11) removably insertable into said driver sleeve (8;

     108) by simple axial movement, means (22;

     122) on said unit engagable with said nut (21;

     121) to secure said nut against rotation relative to said unit, a non-rotatable but longitudinally shiftable coupling between said driver sleeve (8;

     108) and said threaded rod securing said threaded rod (11) against rotation relative to said driver sleeve (8;

     108) but allowing it to rotate relative to said nut (21;

     121) upon rotation of said driver sleeve relative to the nut by the driving device, said threaded rod (11) and nut (21;

     121) removable as a unit from said driver sleeve and unit when the injection ampule (15;

     115) is removed from the unit, and said nut held securely in engagement with said means (22;

     122) by the rear end of the injection ampule when the threaded rod (11) and nut (21;

     121) and the injection ampule are inserted into the unit.

2. Unit according to claim 1, including a housing (1;

101) surrounding all parts of the unit including a cavity (5;

     105) for the injection ampule (15;

     115) which has an outlet piece (30) on one end thereof, the cavity having an end opening for the replacement of the injection ampule (15;

     115) a detachable connecting part (27;

     127) connectable to the housing to close the end opening and by means of which the outlet piece (30) of the injection ampule (15;

     115) can be connected to a catheter (32;

     132).

3. Unit according to claim 2, in which the catheter (32;

132) is rigidly connected with the connecting part (27;

     127) and communicates with a cavity of the connecting part into which the outlet piece (30) of the injection ampule (15;

     115) can be introduced.

4. Unit according to claim 1, including a toothed rim (9) is placed or formed on the driver sleeve (8), and a pinion (2) driven by the driving device engaged with said toothed rim (9).

5. Portable infusion unit for the automatic discharge of liquid from an exchangeable injection ampule (15;

115) with a driving device for the advance of the piston (14) of the injection ampule (15;

     115) comprising, a rotatable driver sleeve (8;

     108) connected to be rotatably driven by the driving device, a threaded rod (11) for the advance of the piston (14) of the injection ampule (15;

     115) which is inserted in a non-rotary but longitudinally shiftable manner into said driver sleeve (8;

     108), a nut (21;

     121) on the threaded rod (11), said unit including a mounting cavity (5;

     105) for the injection ampule (15;

     115) and the nut (21;

     121) into which the injection ampule can be axially introduced, an end wall (23;

     123) at the rear end of the cavity having a passage hole for the threaded rod (11), said end wall (23;

     123) having means (22;

     122) cooperating with a surface (20) of the nut (21;

     121) to secure said nut against turning, and the nut (21;

     121) is held securely between the end wall (23;

     123) and the rear end of the injection ampule (15;

     115) against axial shifting when the injection ampule (15;

     115) is in place.

6. Unit according to claim 5, in which the circumference of the nut (21;

121) has an external toothing (20) and the means on said end wall of the mounting cavity (5;

     105) comprising a corresponding internal toothing (22;

     122).

7. Portable infusion unit for the automatic discharge of liquid from an exchangeable injection ampule (15;

115) with a driving device for the advance of the piston (14) of the injection ampule (15;

     115) comprising, a rotatable driver sleeve (8;

     108) connected to be rotatably driven by the driving device, a threaded rod (11) for the advance of the piston (14) of the injection ampule (15;

     115) which is inserted in a non-rotary but longitudinally shiftable manner into said driver sleeve (8;

     108), a nut (21;

     121) on the threaded rod (11) which is held tightly adjacent to the rear end of the injection ampule with the threaded rod (11) and the injection ampule (15;

     115) being inserted into the unit, and a disk (17) pivoted on the front end of the threaded rod (11) which rests against the piston (14) when the injection ampule (15) is in place, whereby the nut engages the unit to prevent rotation thereof.

8. Unit according to claim 7, in which the piston (14) of the injection ampule (15) has a blind hole, and the disk (17) having a peg (13) projecting coaxially forward of the threaded rod (11) and being insertable into the blind hole.

9. Portable infusion unit for the automatic discharge of liquid from an exchangeable injection ampule (15;

115) with a driving device for the advance of the piston (14) of the injection ampule (15;

     115) comprising, a rotatable driver sleeve (8;

     108) connected to be rotatably driven by the driving device, a threaded rod (11) for the advance of the piston (14) of the injection ampule (15;

     115) which is inserted in a non-rotary but longitudinally shiftable manner into said driver sleeve (8;

     108), said threaded rod (11) having two plain, parallel, longitudinal surfaces, on which it is carried along by two corresponding plain inner wall surfaces of said driver sleeve (8), a nut (21;

     121) on the threaded rod (11) which is held tightly adjacent to the rear end of the injection ampule with the threaded rod (11) and the injection ampule (15;

     115) being inserted into the unit, whereby the nut engages the unit to prevent rotation thereof.

10. Portable infusion unit for the automatic discharge of liquid from an exchangeable injection ampule (15;

115) with a driving device for the advance of the piston (14) of the injection ampule (15;

     115) comprising, a rotatable driver sleeve (8;

     108) connected to be rotatably driven by the driving device, a threaded rod (11) for the advance of the piston (14) of the injection ampule (15;

     115) which is inserted in a non-rotary but longitudinally shiftable manner into said driver sleeve (8;

     108), a nut (21;

     121) on the threaded rod (11), said nut engaging the unit to prevent rotation thereof, said unit including a housing (1;

     101) surrounding all parts of the unit including a cavity (5;

     105) for the injection ampule (15;

     115) which has an outlet piece (30) on one end thereof, the cavity having an end opening for the replacement of the injection ampule (15;

     115), a detachable connecting part (27;

     127) connectable to the housing to close the end opening, a catheter (32;

     132) rigidly connected with said connecting part (27;

     127) and communicating with a cavity of the connecting part, the outlet piece (30) of the injection ampule (15;

     115) being conically tapered towards the front, the cavity of the connecting part (27;

     127) being correspondingly conically tapered to receive the outlet piece (30), to connect the same to the catheter (32;

     132), and a screw thread connection (26;

     126) between the connecting part and the housing (1, 24;

101,

     124) so that with the injection ampule (15;

     115) and treaded rod (11) with the nut (21;

     121) being inserted into the unit, the wall of the cavity in the connecting part (27;

     127) is tightly pressed against the outlet piece (30) of the injection ampule (15;

     115) with the opposite rear end of the injection ampule held tightly against the nut (21;

     121).