초록 ▼

A pen shaped syringe for repetitive injection of individually set doses of a medicine from a cylinder ampoule reservoir comprises a dose setting member which may be rotated to cause a rotative movement of a dosing member and a combined rotative and axial movement of an indicator member indicating th

A pen shaped syringe for repetitive injection of individually set doses of a medicine from a cylinder ampoule reservoir comprises a dose setting member which may be rotated to cause a rotative movement of a dosing member and a combined rotative and axial movement of an indicator member indicating the set dose, and a piston drive member which when rotated in one direction moves the piston into the cylinder ampoule. A unidirectional coupling is established between the dosing member and the piston drive member by each member carrying a disc having surfaces with sector shaped saw teeth riding over each other when the dosing member is rotated in the dose setting direction and engaging each other when the dosing member is rotated in the opposite direction corresponding to the direction of rotation by which the piston is moved into the cylinder ampoule. A nut/screw connection is established between a syringe housing and the dose setting member, and means are provided to release the unidirectional coupling between the piston drive member and the dosing member by drawing the coupling discs away from each other.

대표청구항 ▼

An apparatus for use with a pen shaped syringe for repetitive injection of individually set doses of a medicine from a cylinder ampoule reservoir, comprising: a housing, a nut member with an internal thread fixed in the housing, a dose setting member rotatable in a fist direction to set a dose and i

An apparatus for use with a pen shaped syringe for repetitive injection of individually set doses of a medicine from a cylinder ampoule reservoir, comprising: a housing, a nut member with an internal thread fixed in the housing, a dose setting member rotatable in a fist direction to set a dose and in a second direction to inject a set dose, and comprising a spindle with an external thread engaging the internal thread of said nut member, a dosing member coupled to the dose setting member to be rotated with this dose setting member, an indicator member, rigidly connected to the dose setting member to follow axial and rotational movement of this dose setting member, a piston drive member which when rotated in said second direction moves a piston into the cylinder ampoule, a unidirectional coupling provided between the dosing member and the piston drive member, by a first coupling part on the dosing member engaging a second coupling part on the piston drive member and so directed that the rotation of dosing member induced by dose setting rotation of the dose setting member is not transmitted to the piston drive member whereas rotation in the opposite dosing direction is; wherein a nut/screw connection is established between the housing and the dose setting member and means are provided to optionally release the unidirectional coupling between the dosing member and the piston drive member.