Injection device, in particular an auto-injector

An injection device, which injection device is designed to be displaceable from a storage position into an injection position, comprising

• a sleeve-shaped base housing, which base housing has a distal end which can be directed towards a patient and a proximal end remote therefrom, between which ends a longitudinal axis extends,
• an ampule containing an injection fluid to be dispensed during the injection procedure,
• a needle arrangement disposed in front of the ampule in a direction of the distal end in the storage position of the injection device,
• at least one drive assembly comprising a drive for automatically dispensing the injection fluid to be dispensed during the injection procedure,
• a securing assembly, which securing assembly secures the at least one drive assembly in its position with respect to the base housing until activated for the injection procedure,
• the securing assembly comprising a securing cap and at least one retaining arm, and the securing cap comprising a cap jacket, a cap wall and a securing pin which is disposed inside the cap jacket at a center on the cap wall and extending in the direction of the longitudinal axis, and
• in the storage position on the external face of the base housing, the securing cap is retained in a securing position for the at least one drive assembly, and in the securing position, the securing pin is disposed inside the at least one retaining arm at the axial center of the securing assembly, and in the securing position, the securing pin holds the at least one retaining arm of the securing assembly in a stationary position in the radial direction relative to the longitudinal axis preventing a radial movement inwards in the direction towards the longitudinal axis, and the at least one retaining arm forms a connecting member to the drive assembly, and
• a guide arrangement having at least one first guide element and at least one second guide element cooperating therewith is provided between the securing cap and the base housing, and
• the ampule, the needle arrangement, the at least one drive assembly and the securing assembly are accommodated or disposed in the base housing, and the securing assembly and the drive assembly are disposed in that part of the base housing constituting the proximal end, and
• the at least one first guide element is formed by a projection which is disposed or arranged on an internal face of the cap jacket and projects out from said internal face in the direction towards the longitudinal axis, and
• the at least one second guide element is formed by a guideway which is arranged or disposed on the base housing proximate the securing cap and in that part of the base housing constituting the proximal end, or the at least one second guide element is formed by a groove-shaped recess and/or projection disposed or arranged proximate the securing cap and in that part of the base housing constituting the proximal end, and
• the securing cap is displaceable from its securing position in the axial direction and towards the end remote from the distal end into a releasing position, and
• the at least one first guide element and the at least one second guide element define an axial adjustment path of the securing cap delimited in the axial direction between its securing position and its releasing position, as a result of which the securing cap is still disposed and retained on the base housing in its releasing position and the at least one retaining arm for triggering and activating the drive assembly is also released by the securing pin at the same time,
• wherein the securing assembly further comprises an overcap which is detachably retained on the securing cap,
• wherein the securing assembly further comprises a display unit, which display unit displays at least one of the two positions of the securing cap relative to the base housing,
• wherein the display unit further comprises a display mounting element, which display mounting element is disposed inside the cap jacket and directly adjacent to the cap wall, and the display mounting element is guided and displaceable on the base housing in the axial direction and the securing cap can also be pivoted relative to the display mounting element about the longitudinal axis, and the display mounting element is also held in position on the securing cap relative thereto in the direction of the longitudinal axis, and
• wherein the display unit further comprises at least one first display formed by an orifice in the cap wall of the securing cap and at least one second display disposed on the display mounting element.

An injection device, which injection device is designed to be displaceable from a storage position into an injection position, comprising

• a sleeve-shaped base housing, which base housing has a distal end which can be directed towards a patient and a proximal end remote therefrom, between which ends a longitudinal axis extends,
• an ampule containing an injection fluid to be dispensed during the injection procedure,
• a needle arrangement disposed in front of the ampule in a direction of the distal end in the storage position of the injection device,
• at least one drive assembly comprising a drive for automatically dispensing the injection fluid to be dispensed during the injection procedure,
• a securing assembly, which securing assembly secures the at least one drive assembly in its position with respect to the base housing until activated for the injection procedure,
• the securing assembly comprising a securing cap and at least one retaining arm, and the securing cap comprising a cap jacket, a cap wall and a securing pin which is disposed inside the cap jacket at a center on the cap wall and extending in the direction of the longitudinal axis, and
• in the storage position on the external face of the base housing, the securing cap is retained in a securing position for the at least one drive assembly, and in the securing position, the securing pin is disposed inside the at least one retaining arm at the axial center of the securing assembly, and in the securing position, the securing pin holds the at least one retaining arm of the securing assembly in a stationary position in the radial direction relative to the longitudinal axis preventing a radial movement inwards in the direction towards the longitudinal axis, and the at least one retaining arm forms a connecting member to the drive assembly, and
• a guide arrangement having at least one first guide element and at least one second guide element cooperating therewith is provided between the securing cap and the base housing, and
• the ampule, the needle arrangement, the at least one drive assembly and the securing assembly are accommodated or disposed in the base housing, and the securing assembly and the drive assembly are disposed in that part of the base housing constituting the proximal end, and
• the at least one first guide element is formed by a projection which is disposed or arranged on an internal face of the cap jacket and projects out from said internal face in the direction towards the longitudinal axis, and
• the at least one second guide element is formed by a guideway which is arranged or disposed on the base housing proximate the securing cap and in that part of the base housing constituting the proximal end, or the at least one second guide element is formed by a groove-shaped recess and/or projection disposed or arranged proximate the securing cap and in that part of the base housing constituting the proximal end, and
• the securing cap is displaceable from its securing position in the axial direction and towards the end remote from the distal end into a releasing position, and
• the at least one first guide element and the at least one second guide element define an axial adjustment path of the securing cap delimited in the axial direction between its securing position and its releasing position, as a result of which the securing cap is still disposed and retained on the base housing in its releasing position and the at least one retaining arm for triggering and activating the drive assembly is also released by the securing pin at the same time,
• wherein the securing assembly further comprises an overcap which is detachably retained on the securing cap, and
• wherein the securing cap and the detachably retained overcap are displaceable together from the securing position to the releasing position.