| 摘要 |
<p>A needleless syringe is disclosed for use in delivering a particle into target tissues of a subject. The syringe comprises a barrel (31) and a macroprojectile (32) received in the barrel (31). A downstream side of the macroprojectile (32) carries the particle (45) to be delivered. A macroprojectile arresting device (41) is arrested at the downstream end of the barrel to arrest movement of the macroprojectile (32). An energy source is provided for accelerating the macroprojectile along the bore (36) of the barrel (31), to cause the particle (45) to be launched from the syringe as movement of the macroprojectile (32) is arrested by the arresting device (41). The macroprojectile (32) may be injection moulded in a polyolefin material. In addition, the downstream side of the macroprojectile (32) may be either provided with a plurality of bristles (20) to assist retention of the particle, or provided with a plated surface to assist separation of the particle. The macroprojectile arresting device (41) may be provided with a cushioning portion (43) to cushion deceleration of the macroprojectile (32). The barrel (31) may comprise an upstream portion (31b) and a downstream portion (31a), with the upstream portion (31b) being separable from the downstream portion (31a). This upstream barrel portion (31b), together with the macroprojectile (32), can thus from a removable cartridge (44) to enable ready replacement of a spent cartridge with a fresh cartridge.</p> |
