Air shot mechanism for electronic injection devices
First Claim
1. An electronic injection device, comprising:
- a housing containing an electronic circuit into which the size of a set dose can be read by operation of dose setting means, an injection button which can be operated to inject a set dose, an ampoule from which the set of medicine can be pressed out through a needle mounted at the distal end of the ampoule by an electrical driven motor when the injection button is operated, and an air-shot means that when actuated causes an air-shot signal to be sent to the electronic circuit, the electronic circuit actuating the motor to expel a pre-set, non adjustable small air shot dose from the cartridge.
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Abstract
Described is an electronic injection device wherein an electronic circuit is designed to work in two alternative modes: an air shot mode and a dose injection mode. When working in the air shot mode a small predetermined air shot dose is pressed out from the ampule when the injection button is actuated. When working in the injection mode, a dose set by operation of the dose setting means is injected by operation of the injection button. The electronic injection device is normally working in the air shot mode but shifts to work in the dose injection mode when it receives a signal indicating that the dose setting means has been operated. The circuit returns to its air shot mode when receiving a signal indicating that the set dose has been injected. This signal can originate either from a switch indicating that the protection cap is mounted or from a switch indicating that the injection button has been pressed.
179 Citations
27 Claims
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1. An electronic injection device, comprising:
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a housing containing an electronic circuit into which the size of a set dose can be read by operation of dose setting means, an injection button which can be operated to inject a set dose, an ampoule from which the set of medicine can be pressed out through a needle mounted at the distal end of the ampoule by an electrical driven motor when the injection button is operated, and an air-shot means that when actuated causes an air-shot signal to be sent to the electronic circuit, the electronic circuit actuating the motor to expel a pre-set, non adjustable small air shot dose from the cartridge. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An injection device comprising:
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a cartridge of medicament;
a drive mechanism configured to expel medicament from the cartridge;
an electronic control unit that actuates the drive mechanism;
a means for setting a desired dose to be expelled from the cartridge; and
wherein the control mechanism is configured so that at the request of a user the drive mechanism is actuated to expel an a predetermined air shot dose from the cartridge, without the need for the user to select the size of the air shot dose. - View Dependent Claims (9, 10, 11, 12)
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13. A method for priming and injecting a dose of medication from an electronic injection device having an electronic control unit and a drive mechanism for expelling medicament contained within the device, the method comprising:
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a. pressing a button to send a signal to an electronic control mechanism to prime the device by expelling a predetermined air-shot dose;
b. actuating the drive mechanism, upon receipt of the signal from step a, to expel a predetermined air shot dose from the cartridge, wherein the size of the dose is automatically, without user intervention, determined by the electronic control unit;
c. setting a predetermined dose of medication to inject;
d. injecting the predetermined dose of medication; and
wherein steps a and b may be performed before or after step c but wherein steps a-c are performed prior to step d; and
wherein the method of steps a-d are repeated. - View Dependent Claims (14, 15)
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16. A medication delivery device comprising:
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a. a cartridge containing a medication;
b. an electronic control unit;
c. a plurality of buttons connected to the electronic control unit so that a user may interface with the electronic control unit;
d. a motorized drive mechanism for expelling medication from the cartridge;
e. wherein the electronic control unit is configured to accept a dose size from the user and to control the motorized drive mechanism to expel the dose from the cartridge upon receipt of a dosing instruction from the user; and
f. wherein the controller is configured to prime the device prior to injecting the user selected dose, by receiving a command from the user, wherein the command is sent to the control by the user pressing one of the buttons, and wherein the priming occurs by expelling a pro-selected non-user settable air shot dose. - View Dependent Claims (17)
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18. An electronic injection device, comprising:
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a housing containing an electronic circuit into which the size of a set dose can be inputted by operation of dose setting means, an injection button that can be operated to inject a set dose, an ampoule from which the set of medicine can be pressed out through a needle mounted at the distal end of the ampoule by an electrical driven motor when the injection button is operated, further comprising a means for driving out a pre-set small air-shot dose from the cartridge with the aid of the motor upon receipt of an air-shot signal from said circuit. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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25. A method of performing an air-shot in an electronic injection device comprising an electrical motor wherein the method comprises the step of energizing the motor such that the motor drives a mechanical injection mechanism forward to press out a pre-set, non-adjustable air-shot dose from the cartridge.
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26. An electronically controlled motorized injection device comprising:
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a motorized drive means for expelling medication from the device;
a first circuit for inputting a user selected dose size to be expelled;
a second circuit for priming the device to expel a small predetermined non-adjustable air shot dose;
a third circuit for driving the motorized drive means to expel either the air shot dose or the user selected dose. - View Dependent Claims (27)
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Specification