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Liquid Purification

Injection-device

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Injection device

Details

Inventors: Blomberg, Anders;
Assignee:
Primary Examiner: Rosenbaum; C. Fred
Assistant Examiner: Lester; Michelle N.
Attorney, Agent or Firm:

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.

DETAILED DESCRIPTION The object is achieved by means of an injection device according to the present invention, which is characterized in that it comprises a holding device which is changeable between a releasing position and a holding position, in which the barrel part is held against movements in its longitudinal direction relative to the inner part; and in that it also comprises a displacement device for displacing the plunger part in two directions relative to the barrel part between a fore and a rear displacement position, the arrangement being such that the fore displacement position is a releasing position for the plunger part.
In the remaining displacement positions it is in a position to bring the plunger part to both displacement positions.
The inner part is changeable between a rear position, with the syringe needle positioned inside said opening, and an advanced position, with the syringe needle pushed outside said opening in order to insert the needle into body tissue.
The injection device includes an outer part, in which an electric motor is positioned and controlled by means of an electronic control device.
The electric motor is by means of a transmission mechanism connected to the displacement device, for accomplishing its displacement movements in a sequence determined by means of the control device for loading the injection syringe, as well as for insertion and injection.

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