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Syringe Pump Patent
 

Syringe pump with barrel size sensor arm

A syringe pump has a pusher (86) that pushes in the plunger (81) of a syringe (8) to dispense medication. A pivoted barrel size sensor arm (201) engages the syringe barrel (82) at one end (203) and carries three flags (207 208 and 209) at the other end (205), which move across three sensors (217 218 and 219) such that each sensor can change from a first state to a second state and back to a first state as the arm moves, to provide nine different size outputs.

Method of detecting disorder of syringe pump, liquid sucking discharging device, and biochemical analyzer

A pressure sensor is connected to an intermediate portion of an air pipe that connects a syringe pump to a spotting nozzle of a spot fixing device. The syringe pump consists of a syringe and a plunger that slides up and down in the syringe, for sucking and discharging a liquid through the spotting nozzle. While moving the plunger in the same work range as in the actual sucking discharging operation, internal pressure of the syringe pump is measured by the pressure sensor, and derivative values of the measure pressure are obtained by differentiation. The derivative values are compared with threshold values, to detect disorder of the syringe pump, such as leakage caused by insufficient air-tightness of the syringe to the plunger or some defect in the plunger.

Syringe-pump driving apparatus

It is an object of the present invention to provide a multiple-syringe-pump driving apparatus having superior liquid discharging and drawing-up precision. A syringe-pump driving apparatus of the present invention is used for controlling discharge from and drawing-up into a plurality of syringe pumps interconnected in parallel. The syringe-pump driving apparatus 10 comprises: a syringe holder 18 for supporting syringes 14a to 14h of the plurality of syringe pumps 12a to 12h so as to be arranged in parallel; a plunger holder 20 for supporting plungers 16a to 16h contained in the syringes 14a-14h so as to be arranged in parallel; three or more drive screws 24-1 to 24-3 for moving the plunger holder 20 and the syringe holder 18 relative to each other in a straight line in a syringe axial direction 30; and one or a plurality of motors 26 serving as a source of motive power for the drive screws 24-1 to 24-3. The three or more drive screws 24-1 to 24-3 are connected to the syringe holder 18 or the plunger holder 20 at three or more driving points to transmit motive power to the syringe holder 18 or the plunger holder 20 via the three or more driving points.

Syringe pump

Travel amount detecting means 10 for detecting the travel amount of a plunger 4b, distal end detecting means 11 for detecting the fact that the plunger 4b has moved to the distal end of a syringe 4 distance measuring means for measuring the travel distance of the plunger 4b, input means 13 capable of inputting the capacity of the syringe 4 and storage means 14 capable of storing the measured travel distance of the plunger 4b and the input capacity of the syringe 4 are provided. The control means 16 selects the travel distance of the plunger 4b corresponding to the input capacity from the storage means 14 and controls the injection of a chemical solution in the syringe 4 accomplished via plunger pressing means based on the travel distance of plunger and the capacity of syringe. Thereby, a syringe pump can be provided which can be used for a syringe that is sold newly or a syringe with a dimension changed by design change or remodeling.


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