Automatic applicator for liquid pharmaceutical preparations, particularly for insulin

摘要

An automatic applicator for liquid pharmaceutical preparations, particularly for multiple injection application of set doses of a medicine from an exchangeable container is provided. The automatic applicator includes a body housing connected to a housing of an exchangeable container with a medicine having a plunger, the said plunger being displaced only linearly by an integrated driving unit, suitable for immobilizing, driving, leading linearly and blocking rotation of the plunger, driven via a double action clutch, by a tensioning spring situated in the body housing, the spring tensioned by a rotary hand-dose-setting ring via the double action clutch, wherein the driving unit is activated by a trigger unit and a dose is indicated by an indicating arrangement. The automatic applicator further includes at least one block key placed in an upper part of a ratchet barrel, collaborating with at least one key placed in an internal part of the body housing.

主权项

1. An automatic applicator for liquid pharmaceutical preparations comprising a housing (1) that comprises an open rear end, the housing (1) having a plunger (12), suitable for expelling the medicine, the plunger (12) comprising closed endings and being linearly displaceable by a driving unit, driven via a double action clutch, by a driving spring (15), which is a twisted non-compression spring, situated in the housing (1), the driving spring (15) being twistable by a rotary hand-dose-setting ring (3) via the double action clutch, wherein the driving unit is activated by pressing a trigger unit (13) and a dose is indicated via an inspection window (1.1) by an indicating arrangement, wherein the double action clutch comprises a coupling sleeve (6) that is connected to the rotary hand-dose setting ring (3) and coupled with a ratchet barrel (5), said ratchet barrel (5) comprises at least one ratchet arm and is connected to the twisted non-compression driving spring (15), said driving spring (15) being connected to a spring block (4), said spring block (4) being connected to the housing (1) and secured against rotation;
wherein the coupling sleeve (6) extends above the housing (1) and comprises a longitudinal and substantially cylindrical portion with an internal space adapted to cover directly at least one half of the length of the plunger (12); wherein when the coupling sleeve (6) is rotated by turning the rotary hand-dose-setting ring (3) clockwise for increasing the dose, said rotary hand-dose-setting ring (3) is substantially axially immovable and the ratchet barrel (5) is rotated together with the coupling sleeve (6); wherein the ratchet barrel (5) is separated from the hand-dose-setting rind (3) and mounted within the housing (1) such that it is secured against elongating above the housing (1).