Automatic pharmaceutical dispensing syringe

专利名称：Automatic pharmaceutical dispensing

syringe

发明人：Terry M. Haber,Clark B. Foster,William H.

Smedley

申请号：US07/987475申请日：19921207公开号：US05320609A公开日：19940614

摘要：An automatic pharmaceutical dispensing syringe (2), includes a main barrel (4)having hollow interior (18) sized to house a conventional pharmaceutical cartridge (16)and needle (6). A cap (6) at one end (8) of the main barrel is used to rotate a threadeddosing screw (158) housed within the main barrel. The dosing screw is permitted to moveaxially within the main barrel. The dosing screw threads (156) engage similar threads(146) on an elongate piston driver (140) which abuts the cartridge piston (152). A brakepad (194) secures the piston driver to the main barrel while the cap is rotated to selectthe desired dose. Doing so causes the dosing screw to move axially relative to the pistondriver to compress an injection spring (174). The injection sequence is begun by placingthe distal end (114) of an outer sleeve (10) surrounding the main barrel against thepatient and pressing a trigger (130). This permits a needle insertion spring (106), capturedbetween the main barrel and the outer sleeve, to drive the main barrel, cartridge andneedle assembly distally, thus driving the needle into the patient. Only at the end oftravel does the brake pad release the piston driver to permit the injection spring to drivethe piston driver against the piston thus forcing the pharmaceutical through the needle

and into the patient.

申请人：HABLEY MEDICAL TECHNOLOGY CORPORATION

代理机构：Townsend & Townsend Khourie & Crew

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