| 摘要 |
An improved medical jet injector for administering intramuscular and subcutaneous injections without a needle that includes an injection head (1) comprising a centrally located longitudinal chamber (14) capable of being filled with a determined dose of a liquid medicinal substance and a piston (15) guided to move inside said longitudinal chamber (14) and intended both to fill said chamber with the predetermined dose of the medicinal substance and to expel said substance through fine holes of a mouthpiece (10) of said injection head (1) when applied to the skin of a patient. The medical jet injector also includes an injector power unit (2) having an energy storing compression spring (25) and a releasable spring compression latch mechanism (4). The injector power unit (2) comprises a ram (21) that is slideably mounted in an inner barrel (20) and is, in normal operation of the medical jet injector, connected to the piston (15) of the injection head (1) for synchronous longitudinal movement in both directions. The injection head (1) is designed and shaped so that it forms a complete, interchangeable sub-assembly capable of being, especially for the purposes of cleaning, disinfection and/or other maintenance operations, separated as a whole from the injector power unit (2). |
