| 摘要 |
The present invention provides, in a preferred embodiment, a retractable needle (26) device for use with a syringe. The syringe may be manually driven or electronically driven. In the retracted position, the needle is enclosed within a safety shield and may be extended from the safety shield (60) upon actuation of the plunger (38) normally used to dispense the biocompatible material from the needle. In this instance, initial pressure on the plunger serves to extract the needle and after the needle is extracted, the biocompatible material is dispensed from a carpule in communication with the needle. When it is desired to retract the needle, the direction of the plunger travel is reversed thereby effectively retracting the needle back in to the safety shield.
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