LIQUID DELIVERY DEVICES, SYSTEMS AND METHODS Russian patent published in 2011 - IPC A61M39/04 A61M5/00 

FIELD: medicine.

SUBSTANCE: invention refers to medical equipment, namely to devices which can be implanted in a living object or attached thereto to facilitate the liquid introduction, e.g. a drug, in the living object. A liquid delivery device comprises a body, a cannula and a cannel closure unit. The body comprises a first inlet hole, a first liquid delivery channel passing from the first inlet hole, and a second liquid delivery channel. The cannula has a section coaxial with a section of one of the first and second liquid delivery channels. The cannel closure unit is oriented in a first position which substantially blocks a liquid flow from the first inlet hole in the first liquid delivery channel and from the body, but simultaneously allows the liquid flow in the second liquid delivery channel. The cannel closure unit is moved in a second position which substantially blocks the liquid flow in the second liquid delivery channel, but simultaneously allows the liquid flow in the first liquid delivery channel. Under the second version, the liquid delivery device comprises a body, a first partition, a second partition, a cannula and a needle regulation section. The body has two liquid delivery channels. The first partition substantially prevents the liquid flow in one of the two liquid delivery channels. The second partition substantially prevents the liquid flow in the other liquid delivery channel. The cannula has a section coaxial with a section of one of the first and second liquid delivery channels. The needle regulation section is shaped so that protects the needle fitted for liquid injection through the liquid delivery device and in the living object from a cannula puncture during a normal liquid injection. Under the third version, the liquid delivery device comprises a body, a needle guide, a first seal mechanism and a second seal mechanism. The body comprises first and second liquid delivery channels. The needle guide comprises a section integrated in the first liquid delivery channel. The first seal mechanism substantially prevents the liquid flow in the first liquid delivery channel. The first seal mechanism contains an accessible section which is accessible for an injection needle during normal application of the liquid delivery device. The accessible section has a perimetre of the accessible section. The first seal mechanism contains also a surface segment which is near to an open space which is downstream from the surface segment and integrated in the first liquid delivery channel. The surface segment has a perimetre of the surface segment which is less than the perimetre of the accessible section. The second seal mechanism substantially prevents the liquid flow in the second liquid delivery channel. The second seal mechanism does not contact with the first seal mechanism.

EFFECT: liquid delivery devices are carried for a long period of time (eg, for several days) and allow a user to introduce the liquid (eg, a drug prescribed by a doctor) into a user's body, with no need to multiple skin needle puncture.

29 cl, 43 dwg