Patent MX-2011004660-A (MX)
Title: Injection device with holding means to prevent unintentional movements of piston rod.
Inventor: SCHABBACH MICHAEL
IPC: A61M5/315
Filed: 2009-12-01
Abstract: The invention relates to a injection device, comprising a housing being adapted to receive in its proximal housing portion a container with an injection fluid and to receive in its distal housing portion a dose setting and injection mechanism, wherein the mechanism includes a piston rod (28) being axially displaceable with respect to the housing for dispensing injection fluid from the container, wherein the piston rod (28) has an outer thread (34) and is arranged torque proof with respect to the housing, dose setting means comprising a threaded element, which threaded element has an inner thread being in engagement with the outer thread (34) of the piston rod (28), is designed so that its axial position relative to the housing is changeable and is rotatable relative to the piston rod (28) and relative to the housing during setting of an injection dose, wherein the dose setting means are designed such that the threaded element is held in torque proof manner relative to the piston rod (28) and to the housing during the injection of the beforehand set injection dose in such a manner that the threaded element and the piston rod (28) are axially displaceable together with respect to the housing, wherein the mechanism (26) further comprises holding means (60; 160) being in contact with the piston rod (28) and being designed such that the axial displacement of the piston rod (28) can be substantially immobilized during use of the device except for the dispensing of the injection dose. It is proposed according to the invention that the holding means (60; 160) are axially fixed with respect to the housing. The invention relates to a injection device, comprising a housing being adapted to receive in its proximal housing portion a container with an injection fluid and to receive in its distal housing portion a dose setting and injection mechanism, wherein the mechanism includes a piston rod (28) being axially displaceable with respect to the housing for dispensing injection fluid from the container, wherein the piston rod (28) has an outer thread (34) and is arranged torque proof with respect to the housing, dose setting means comprising a threaded element, which threaded element has an inner thread being in engagement with the outer thread (34) of the piston rod (28), is designed so that its axial position relative to the housing is changeable and is rotatable relative to the piston rod (28) and relative to the housing during setting of an injection dose, wherein the dose setting means are designed such that the threaded element is held in torque proof manner relative to the piston rod (28) and to the housing during the injection of the beforehand set injection dose in such a manner that the threaded element and the piston rod (28) are axially displaceable together with respect to the housing, wherein the mechanism (26) further comprises holding means (60; 160) being in contact with the piston rod (28) and being designed such that the axial displacement of the piston rod (28) can be substantially immobilized during use of the device except for the dispensing of the injection dose. It is proposed according to the invention that the holding means (60; 160) are axially fixed with respect to the housing. The invention relates to a device (1) for heating containers and in particular plastic preforms (10), comprising at least one microwave generator (2) that generates an alternating electromagnetic field in the form of microwaves, a microwave transmission unit (4) that transfers the microwaves generated by the microwave generator (2) to a resonator unit (6), and comprising a transport device that transports the plastic preforms (10) to the resonator unit (6), wherein the resonator unit (6) comprises a resonator housing (8) that forms a receptacle space (10) for heating the plastic preforms (10), said housing having at least one inner wall (22a, 22b, 22c) facing the plastic preforms (10) and an in-coupling area (12) through which the microwaves are introduced into the resonator unit (6), wherein the inner wall (22a, 22b, 22c) is annealed at the surface thereof facing the plastic preforms at least in sections such that the annealing reduces wall power losses in the inner wall caused by the microwaves.