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    • 8. 发明公开
    • MEDICAL INJECTOR WITH ROTATABLE RATCHETING PLUNGER
    • 带可旋转棘轮的医疗注射器
    • EP3251714A1
    • 2017-12-06
    • EP17178475.4
    • 2011-03-17
    • Becton, Dickinson and Company
    • Cronenberg, RichardWu, Haiming
    • A61M5/315
    • A61M5/3158A61M5/1782A61M5/24A61M5/31553A61M5/31555A61M5/31581
    • A medical injector (152) has a body (154) with a displaceable plunger (164). The plunger (164) includes a plurality of spaced-apart ratchet teeth (168) disposed along the length thereof. At least one indexer (176) is provided to engage the plunger (164), wherein the indexer (176) is configured to allow the plunger (164) to displace distally toward a distal end of the body (154) but not proximally toward a proximal end of the body (154). The medical injector (152) also includes an actuator (158) having an engagement portion (178) formed to engage one or more of the ratchet teeth (168). The actuator (158) is displaceable to a ready state, the engagement portion (178) being displaced proximally relative to the plunger (164) with the actuator (158) being displaced to the ready state. The indexer (176) prevents proximal movement of the plunger (164), thereby allowing the engagement portion (178) to bypass one or more of the ratchet teeth (168) with the actuator (158) being displaced to the ready state. In addition, the actuator (158) is displaceable from the ready state to cause actuation of the medical injector (152). The displacement from the ready state causes distal displacement of the engagement portion (178) with the engagement portion (178) engaging one or more of the ratchet teeth (168) and causing distal displacement of the plunger (164) with the engagement portion (178). The plunger (164) is slidably displaceable relative to the body (154), and rotatable relative to the body (154) to selectively engage and disengage ratchet teeth (168) engaged with the indexer (176) and the actuator (158).
    • 医用注射器(152)具有带可移动柱塞(164)的主体(154)。 柱塞(164)包括沿其长度设置的多个间隔开的棘齿(168)。 提供至少一个分度器(176)以接合柱塞(164),其中分度器(176)构造成允许柱塞(164)朝向主体(154)的远端向远侧移位,但不朝近侧 (154)的近端。 医用注射器(152)还包括致动器(158),该致动器具有形成为接合一个或多个棘轮齿(168)的接合部分(178)。 致动器158可移位至准备状态,接合部分178在致动器158移位至准备状态的情况下相对于柱塞164向近侧移位。 分度器(176)防止柱塞(164)向近侧移动,由此允许接合部分(178)绕过一个或多个棘轮齿(168),其中致动器(158)移位到准备状态。 另外,致动器(158)可从准备状态移位以引起医用注射器(152)的致动。 从就绪状态的位移导致接合部分178与接合部分178接合一个或多个棘齿168的远侧移位并导致柱塞164与接合部分178的远侧位移 )。 柱塞164相对于本体154可滑动地移动,并且可相对于本体154旋转以选择性地接合和脱离与分度器176和致动器158接合的棘轮齿168。