Medical injection device

A medical injection device for single use in administration of a liquid, the medical injection device comprising:

• a hollow cylinder comprising a proximal end, a distal end opposite the proximal end, and a longitudinal axis extending from the proximal end to the distal end through an axial center of the hollow cylinder, the hollow cylinder further comprising a cavity for receiving the liquid, and a passage arranged in a region of the distal end, the passage being fluidically connected to the cavity for inflow and/or outflow of the liquid from the cavity, the hollow cylinder further comprising a cylinder base and a circumferential collar portion at the distal end of the hollow cylinder;
• an adaptor body received inside the circumferential collar portion at the distal end of the hollow cylinder, the adaptor body comprising a connection portion for releasable fluid-tight connection to a complementary mating connection portion of a liquid receiving component arranged in such a way that the passage can be fluidically connected to a lumen of the liquid receiving component;
• and
• a shut-off valve arrangement which has a valve body and a flexible sealing ring with an opening, the shut-off valve arrangement configured in such a way that, by virtue of a flow of the liquid directed distally through the passage, the valve body, proceeding from a release position is at least partially movable in a distal direction through the opening of the sealing ring to a blocking position in which the valve body engages the opening in such a way that a movement of the valve body to the release position is blocked and the passage is sealed off against a proximally directed flow,
• the adapter body comprising a proximal end connected to the distal end of the hollow cylinder, and a distal end, on which the connection portion is formed, and having a lumen fluidically connected to the passage, wherein the shut-off valve arrangement is arranged at the proximal end of the adapter body and at the distal end of the hollow cylinder, the valve body being positioned in and movable through the cylinder base,
• the sealing ring comprising a circumferential flange at a proximal end of the sealing ring, and
• the lumen of the adapter body having a proximally arranged receiving portion in which the sealing ring is fitted,
• wherein the receiving portion has an undercut radial groove inside the adapter body that is open at the proximal end of the adapter body,
• wherein the undercut radial groove receives the circumferential flange of the sealing ring in a form-fit engagement to fix the sealing ring to the adapter body,
• wherein the distal end of the hollow cylinder has a first plurality of linear teeth extending parallel to the longitudinal axis of the hollow cylinder,
• wherein the proximal end of the adapter body comprises a second plurality of linear teeth extending parallel to the longitudinal axis of the hollow cylinder, and
• wherein the first plurality of linear teeth meshes with the second plurality of linear teeth in such a way that the adapter body is fixed in a circumferential direction on the hollow cylinder.

A medical injection device for single use in administration of a liquid, the medical injection device comprising:

• a hollow cylinder comprising a proximal end, a distal end opposite the proximal end, and a longitudinal axis extending from the proximal end to the distal end through an axial center of the hollow cylinder, the hollow cylinder further comprising a cavity for receiving the liquid and a passage arranged in a region of the distal end of the hollow cylinder, the passage being fluidically connected to the cavity for inflow and/or outflow of the liquid from the cavity, the hollow cylinder further comprising an integrally molded cylinder base and a circumferential collar portion at the distal end of the hollow cylinder;
• an adaptor body received inside the circumferential collar portion at the distal end of the hollow cylinder, the adaptor body comprising a connection portion for releasable fluid-tight connection to a complementary mating connection portion of a liquid receiving component arranged in such a way that the passage can be fluidically connected to a lumen of the liquid receiving component;
• and
• a shut-off valve arrangement which has a valve body and a flexible sealing ring with an opening and which is arranged and/or configured in such a way that, by virtue of a flow of the liquid directed distally through the passage, the valve body, proceeding from a release position is at least partially movable in a distal direction through the opening of the sealing ring to a blocking position in which the valve body engages the opening in such a way that a movement of the valve body to the release position is blocked and the passage is sealed off against a proximally directed flow,
• the adapter body comprising a proximal end, which is connected with force-fit and/or form-fit engagement to the distal end of the hollow cylinder, and a distal end, on which the connection portion is formed, and having a lumen fluidically connected to the passage, wherein the shut-off valve arrangement is arranged at the proximal end of the adapter body and at the distal end of the hollow cylinder, and
• the valve body being positioned in and movable through the cylinder base,
• wherein the distal end of the hollow cylinder has a first plurality of linear teeth extending parallel to the longitudinal axis of the hollow cylinder,
• wherein the proximal end of the adapter body comprises a second plurality of linear teeth extending parallel to the longitudinal axis of the hollow cylinder, and
• wherein the first plurality of linear teeth meshes with the second plurality of linear teeth in such a way that the adapter body is fixed in a circumferential direction on the hollow cylinder.