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 ampule from which a medicine can be pressed out through a needle mounted at the distal end of the ampule when the injection button is operated, a display driven by the electronic circuit to show the dose set by operation of the dose setting means, wherein the electronic circuit is designed to work in two alternative modes;
an air shot mode in which it controls an automatic pre-setting of a small air shot dose to be pressed out from the ampule when the injection button is actuated, and a dose injection mode in which a dose set by operation of the dose setting means is injected by operation of the injection button, the circuit normally working in the air shot mode but shifting to work in the dose injection mode when it receives a signal indicating that the dose setting means has been operated.
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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.
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Citations
11 Claims
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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 ampule from which a medicine can be pressed out through a needle mounted at the distal end of the ampule when the injection button is operated, a display driven by the electronic circuit to show the dose set by operation of the dose setting means, wherein the electronic circuit is designed to work in two alternative modes;
an air shot mode in which it controls an automatic pre-setting of a small air shot dose to be pressed out from the ampule when the injection button is actuated, and a dose injection mode in which a dose set by operation of the dose setting means is injected by operation of the injection button, the circuit normally working in the air shot mode but shifting to work in the dose injection mode when it receives a signal indicating that the dose setting means has been operated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- 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 ampule from which a medicine can be pressed out through a needle mounted at the distal end of the ampule when the injection button is operated, a display driven by the electronic circuit to show the dose set by operation of the dose setting means, wherein the electronic circuit is designed to work in two alternative modes;
Specification