Peristaltic pump device

Abstract

A micro peristaltic pump of a peristaltic pump device presses a rotor against a circular arc shaped flow path inside a microfluidic chip formed to be sheet-like, rotary-drives the rotor by a motor, and causes the circular arc shaped flow path to make a peristaltic motion by the rotation of the rotor, to send a fluid. The peristaltic pump device is provided with a rotation sensor that detects a rotational position of the rotor, a memory that stores in advance a rotational position of the rotor and rotation speed data of the motor corresponding to the rotational position, and a control circuit that calculates a command rotation speed of the motor from data stored in the memory based on a detection signal of the rotation sensor, and controls rotation of the motor based on the command rotation speed.

What is claimed is: 
     
         1 . A peristaltic pump device comprising:
 a base that includes a cover member, and a chip housing portion formed inside;   a sheet-like microfluidic chip housed inside the chip housing portion and has a circular arc shaped flow path formed inside; and   a micro peristaltic pump to a tip end portion of which a rotor rotatably-pivotally supporting a plurality of rollers is attached so as to be rotary-driven by a motor, and which is fixed to the base by pressing the rollers against the circular arc shaped flow path, wherein   on a flat surface perpendicular to a rotary shaft of the rotor, the plurality of rollers are pivotally supported at even angular intervals to freely rotate in pressure-contact with the circular arc shaped flow path on the flat surface,   the circular arc shaped flow path of the microfluidic chip is formed into a circular arc shape by swelling out of a surface of the microfluidic chip, and disposed along a rotational trajectory of the plurality of rollers, and   a discharge flow path is formed such that the rollers gradually separate from the discharge flow path on a discharge side of the circular arc shaped flow path when the rollers rotate.   
     
     
         2 . The peristaltic pump device according to  claim 1 , wherein the discharge flow path on the discharge side of the circular arc shaped flow path is formed by being curved such that a radius of curvature of a circular arc portion is larger than a radius of curvature of the rotational trajectory of the rollers and smaller than 1.5 times the radius of curvature of the rotational trajectory of the rollers, and a circular arc center of the discharge flow path deviates to an arc opening side from a center of the rotary shaft of the rotor. 
     
     
         3 . The peristaltic pump device according to  claim 1 , wherein the discharge flow path of the circular arc shaped flow path is formed into a circular arc shape by partially swelling out of a surface of the microfluidic chip, and formed so as to be gradually embedded inside the microfluidic chip toward a discharge end to cause the swelling-out portion to gradually disappear. 
     
     
         4 . The peristaltic pump device according to  claim 2 , wherein a buffer chamber is provided in a flow path on a discharge side of the circular arc shaped flow path inside the microfluidic chip, and a narrowed portion is provided in a flow path on a discharge side of the buffer chamber. 
     
     
         5 . The peristaltic pump device according to  claim 3 , wherein a buffer chamber is provided in a flow path on a discharge side of the circular arc shaped flow path inside the microfluidic chip, and a narrowed portion is provided in a flow path on a discharge side of the buffer chamber. 
     
     
         6 . The peristaltic pump device according to  claim 2 , wherein a control circuit to control a rotation speed of the motor is provided, and the control circuit is provided with a rotation sensor that detects a rotational position of the rotor and generates a detection signal indicating the rotational position, and a memory that stores in advance the rotational position of the rotor and rotation speed data of the motor corresponding to the rotational position. 
     
     
         7 . The peristaltic pump device according to  claim 3 , wherein a control circuit to control a rotation speed of the motor is provided, and the control circuit is provided with a rotation sensor that detects a rotational position of the rotor and generates a detection signal indicating the rotational position, and a memory that stores in advance the rotational position of the rotor and rotation speed data of the motor corresponding to the rotational position. 
     
     
         8 . The peristaltic pump device according to  claim 4 , wherein a control circuit to control a rotation speed of the motor is provided, and the control circuit is provided with a rotation sensor that detects a rotational position of the rotor and generates a detection signal indicating the rotational position, and a memory that stores in advance the rotational position of the rotor and rotation speed data of the motor corresponding to the rotational position. 
     
     
         9 . The peristaltic pump device according to  claim 5 , wherein a control circuit to control a rotation speed of the motor is provided, and the control circuit is provided with a rotation sensor that detects a rotational position of the rotor and generates a detection signal indicating the rotational position, and a memory that stores in advance the rotational position of the rotor and rotation speed data of the motor corresponding to the rotational position. 
     
     
         10 . The peristaltic pump device according to  claim 6 , wherein the control circuit is configured such that a command rotation speed of the motor from data stored in the memory is calculated based on a detection signal transmitted from the rotation sensor, and rotation of the motor is controlled based on the command rotation speed to, in a stroke in which the rollers separate from the discharge flow path after pressing the discharge flow path to push out the fluid, increase the rotation speed of the rollers, and immediately after the rollers separate from the discharge flow path, the rotation speed of the rollers is reduced to return the rotation speed to a normal speed. 
     
     
         11 . The peristaltic pump device according to  claim 7 , wherein the control circuit is configured such that a command rotation speed of the motor from data stored in the memory is calculated based on a detection signal transmitted from the rotation sensor, and rotation of the motor is controlled based on the command rotation speed to, in a stroke in which the rollers separate from the discharge flow path after pressing the discharge flow path to push out the fluid, the rotation speed of the rollers is increased, and immediately after the rollers separate from the discharge flow path, the rotation speed of the rollers is reduced to return the rotation speed to a normal speed. 
     
     
         12 . The peristaltic pump device according to  claim 8 , wherein the control circuit is configured such that a command rotation speed of the motor from data stored in the memory is calculated based on a detection signal transmitted from the rotation sensor, and rotation of the motor is controlled based on the command rotation speed to, in a stroke in which the rollers separate from the discharge flow path after pressing the discharge flow path to push out the fluid, increase the rotation speed of the rollers, and immediately after the rollers separate from the discharge flow path, the rotation speed of the rollers is reduced to return the rotation speed to a normal speed. 
     
     
         13 . The peristaltic pump device according to  claim 9 , wherein the control circuit is configured such that a command rotation speed of the motor from data stored in the memory is calculated based on a detection signal transmitted from the rotation sensor, and rotation of the motor is controlled based on the command rotation speed to, in a stroke in which the rollers separate from the discharge flow path after pressing the discharge flow path to push out the fluid, the rotation speed of the rollers is increased, and immediately after the rollers separate from the discharge flow path, the rotation speed of the rollers is reduced to return the rotation speed to a normal speed. 
     
     
         14 . The peristaltic pump device according to  claim 1 , wherein a concave portion is formed on an inner surface of the cover member, and the concave portion is formed at a position corresponding to the discharge flow path of the circular arc shaped flow path such that pressing on the circular arc shaped flow path by the rollers gradually decreases in the discharge flow path. 
     
     
         15 . The peristaltic pump device according to  claim 14 , wherein a buffer chamber is provided in a flow path on a discharge side of the circular arc shaped flow path inside the microfluidic chip, and a narrowed portion is provided in a flow path on a discharge side of the buffer chamber. 
     
     
         16 . The peristaltic pump device according to  claim 14 , wherein a control circuit to control a rotation speed of the motor is provided, and the control circuit is provided with a rotation sensor that detects a rotational position of the rotor and generates a detection signal indicating the rotational position, and a memory that stores in advance the rotational position of the rotor and rotation speed data of the motor corresponding to the rotational position. 
     
     
         17 . The peristaltic pump device according to  claim 15 , wherein a control circuit to control a rotation speed of the motor is provided, and the control circuit is provided with a rotation sensor that detects a rotational position of the rotor and generates a detection signal indicating the rotational position, and a memory that stores in advance the rotational position of the rotor and rotation speed data of the motor corresponding to the rotational position.