Syringe pump

Abstract

A syringe pump is disclosed, which uses the linear actuator applying a linear motion of a piezoelectric linear motor in moving the piston, such that suction and exhaustion of the fluid can be performed more precisely through controlling of power supply with respect to the piezoelectric linear motor. The syringe pump includes a cylinder which includes a receiving space, a piston which is mounted in the cylinder to pump liquid or powder in and out of the cylinder, and a piezoelectric linear actuator which moves the piston in a reciprocating manner. In addition, the piezoelectric linear actuator comprises a piezoelectric linear motor.

1 . A syringe pump comprising:
 a cylinder which includes a receiving space;   a piston which is mounted in the cylinder to pump liquid or powder in and out of the cylinder; and   a piezoelectric linear actuator which moves the piston in a reciprocating manner.   
     
     
         2 . The syringe pump according to  claim 1 , wherein the piezoelectric linear actuator comprises a piezoelectric linear motor performing a linear motion. 
     
     
         3 . The syringe pump according to  claim 1 , further comprising a rod mounted between the piston and the linear actuator. 
     
     
         4 . The syringe pump according to  claim 2 , further comprising a rod mounted between the piston and the linear actuator. 
     
     
         5 . The syringe pump according to  claim 3 , wherein the rod includes a connection protrusion formed in a spherical shape on a surface thereof facing the piston, and the piston includes a connection recess formed in a spherical shape and ball-jointed with the connection protrusion. 
     
     
         6 . The syringe pump according to  claim 4 , wherein the rod includes a connection protrusion formed in a spherical shape on a surface thereof facing the piston, and the piston includes a connection recess formed in a spherical shape and ball-jointed with the connection protrusion. 
     
     
         7 . The syringe pump according to  claim 5 , further comprising a sealant member mounted around the outer circumference of the piston. 
     
     
         8 . The syringe pump according to  claim 6 , further comprising a sealant member mounted around the outer circumference of the piston. 
     
     
         9 . The syringe pump according to  claim 7 , further comprising:
 a needle connection part having a small diameter, being disposed an inlet and outlet end; and   a needle removably connected to the needle connection part.   
     
     
         10 . The syringe pump according to  claim 8 , further comprising:
 a needle connection part having a small diameter, being disposed an inlet and outlet end; and   a needle removably connected to the needle connection part.