Injection device

• US 4,617,016 A
• Filed: 07/19/1983
• Issued: 10/14/1986
• Est. Priority Date: 12/14/1981
• Status: Expired due to Fees

• Current Assignee: Anders Blomberg
• Original Assignee: Anders Blomberg
• Inventors: Blomberg, Anders
• Primary Examiner(s): NOT, DEFINED
• Assistant Examiner(s): Lester, Michelle N.
• Application Number:
  US06/518,805
• Time in Patent Office: 1,183 Days
• Field of Search: 604/154-155, 604/68, 604/71-72, 604/407, 604/414, 128/DIG. 1
• US Class Current: 604/155
• CPC Class Codes: A61M 2005/3152 including gearings to multiply or attenuate the piston displacing force
• CPC Class Codes: A61M 5/1782 Devices aiding filling of syringes in situ combination of a vial and a syringe for transferring or mixing their contents A61J1/2096, filling of medical containers in general B65B3/003
• CPC Class Codes: A61M 5/20 Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically A61M5/142 , A61M5/46 take precedence; hypodermic projectiles F42B12/54
• CPC Class Codes: Y10S 128/01 Motorized syringe

Abstract

Injection device for medical purposes, designed for injection by using a manual hypodermic syringe. It includes a barrel part which in one end has a syringe needle and in the other end a flange; a plunger part having a plunger displaceable in the barrel part, said plunger performing movements, enabling medicine to be sucked into and respectively injected from the barrel portion, and having a gripping part connected with the plunger by means of a plunger rod. The device has an opening in one end, through which the injection syringe can at least partly be introduced into a cavity, and an inner part which is provided with a holding device for the barrel part which is changeable between a releasing position and a holding position, in which the barrel portion is held against movements in its longitudinal direction relative to the inner part. A displacement device is provided for displacing the plunger part between a fore and a rear displacement position. The inner part is changeable between a rear position with the syringe needle positioned inside the opening and an advanced position with the syringe needle pushed outside the opening for insertion. The injection device includes an outer part, in which an electric motor is positioned and controlled by means of an electronic device. A transmission connects it to the displacement device for accomplishing its displacement movements in a sequence determined by the control device, for loading the injection syringe, as well as injection after insertion.

Claims

1. An injection device for medicine, comprising:

an outer part forming a housing, and an inner part reciprocably supported in said outer part, said inner part having an opening and a cavity in communication with said opening; and

an injection syringe having a barrel part having a first end and a second end, a syringe needle at said first end and a flange at said second end, a plunger part in said barrel part and having a plunger displaceably mounted in said barrel part for sucking medicine into said barrel portion and for injecting medicine from said barrel part, said injection syringe extending through said opening at least partly into said cavity, said inner part having a holding device for the barrel part, said holding device having means movable between a releasing position in which said barrel part is reciprocable in said cavity and a holding position, in which said barrel part is held against movement in said inner part, said inner part also having a displacement device operatively connected to said plunger part and movable relative to said holding device in two directions relative to the barrel part, between a fore and a rear displacement position, said displacement device having gripping means movable between a releasing position and a gripping position and operable to release said plunger part in said fore displacement position of said displacement device and to grip the plunger part in other positions of the plunger part, said inner part being movable in said outer part between a rear position in which said syringe needle is positioned inside said opening and a fore position in which the syringe needle is outside said opening for insertion into body tissue, said injection device including a bottle holder positioned at said opening for positioning at least one medicine bottle for loading of said syringe, during which the syringe needle is inserted into a medicine bottle in said bottle holder and a predetermined amount of medicine is sucked into the barrel part, said injection device including an electric motor positioned in said outer part, an electronic control device in said outer part and operatively connected to said motor, and a transmission connecting said electric motor to said displacement device for effecting said displacement movements of said plunger part in a sequence determined by said control device, for loading the injection syringe and for injecting medicine into the body tissue.

2. An injection device according to claim 1, further comprising a tubular intermediate part positioned between said inner part and said outer part and displaceable between a retracted position and an extended position relative to said inner part and said outer part, a spring mechanism connected between said inner part and said intermediate part, means for tensioning said spring mechanism upon movement of said intermediate part and for moving the inner part with the injection syringe a distance from a rear position to a fore position, said outer part including a trigger mechanism having a releasable pawl cooperating with said inner part for locking said inner part in said rear position of said inner part and for releasing said inner part from said rear position to said fore position of said inner part.

3. An injection device according to claim 2, wherein said intermediate part has a top portion and includes supporting means positioned in said top portion, said support means being displaceable in the retracted position of the intermediate part into a removed position and in the extended position of the intermediate part to be in a forward supporting position for the barrel part.

4. An injection device according to claim 2, further comprising straining means connected to the support means for following during part of the movement of the intermediate part.

5. An injection device according to claim 4, wherein said spring mechanism is connected to said straining means.

6. An injection device according to any one of claims 1 to 5, wherein said gripping means includes stopping means and hooking means cooperating with a guide surface in said inner part for changing over between the gripping and the releasing position of the plunger part.

7. An injection device according to any one of claims 1 to 5, wherein said holder is capable of holding at least two medicine bottles and further including means for coupling said holder adjacent to said opening so that insertion of the needle takes place into one bottle at a time, means for sensing the position of the holder, and means for activating said control device for loading the syringe with a preset amount of medicine from each of said at least two bottles.