Injection device
AssigneeHon Hai Precision Industry Co., Ltd.
InventorChing-Yi Mao
Life of this patent
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Abstract
An injection device able to evacuate air bubbles trapped with injectable liquid includes a needle tube, a push rod slidable installed in the needle tube and a piston secured on one end of the push rod. The piston includes a main body and a cover, the main body defines a through hole and an exhaust passage in air communication with the through hole. The cover is secured on the main body to shield the through hole and the exhaust passage, and the cover defines an exhaust hole in air communication with one end of the exhaust passage to allow gas but not the liquid to escape from under the piston.
Claims20
An injection device, comprising:
- a needle tube;
- a push rod slidable in the needle tube;
- and
- a piston on one end of the push rod, the piston comprising a main body and a cover;
- wherein the main body defines a through hole thereon and an exhaust passage, the exhaust passage is helical, one end of the exhaust passage is in air communication with the through hole, the cover is on the main body to shield the through hole and the exhaust passage, the cover defines an exhaust hole in air communication with another end of the exhaust passage to discharge gas from the piston.
An injection module, comprising:
- an injection device configured to inject liquid, comprising:
- a needle tube;
- a push rod slidable in the needle tube;
- and
- a piston on one end of the push rod, the piston comprising a main body and a cover;
- wherein the main body defines a through hole thereon and an exhaust passage, the exhaust passage is helical, one end of the exhaust passage is in air communication with the through hole, the cover is on the main body to shield the through hole and the exhaust passage, the cover defines an exhaust hole in air communication with another end of the exhaust passage to discharge gas from the piston.
Dependencies are inferred from the claim text.