ENDOSCOPE SYSTEM AND METHOD OF USE
A fluid management system is with a fluid source, a fluid receptacle, and a surgical tool having an inlet port for receiving fluid from the fluid source and an outlet port for discharging fluid to the fluid receptacle. The fluid management system includes a pump head assembly and a tubing cassette removably insertable over the pump head assembly. The pump head assembly includes an inlet pump and an outlet pump, where each pump has a rotor, a plurality of rollers, an arcuate roller backing adjacent the rotor to define a tube receiving channel therebetween, and a rotor position sensor. An inlet motor configured to rotate the inlet pump rotor, and an outlet motor configured to rotate the outlet pump rotor. The tubing cassette includes an inlet tubing loop and an outlet tubing loop, where each tubing loop is received about the rollers in the tube receiving channel of the inlet pump when the cassette is placed over the pump head assembly. A controller receives rotational position information from the rotor position sensor of each pump and instructs the motor of each pump to drive said rotor and selectively stop each rotor at a preselected rotational position.
1 . A fluid management system for use with a fluid source, a fluid receptacle, and a surgical tool having an inlet port for receiving fluid from the fluid source and an outlet port for discharging fluid to the fluid receptacle, said fluid management system comprising:
(a) a pump head assembly comprising:
an inlet pump having a rotor which carries a plurality of rollers, an arcuate roller backing adjacent the rotor to define a tube-receiving channel therebetween, and a rotor position sensor;
an outlet pump having a rotor which carries a plurality of rollers, an arcuate roller backing adjacent the rotor to define a tube-receiving channel therebetween, and a rotor position sensor;
an inlet motor configured to rotate the inlet pump rotor; and
an outlet motor configured to rotate the outlet pump rotor;
(b) a tubing cassette comprising:
an inlet tubing loop configured to be received about the rollers in the tube receiving channel of the inlet pump when the cassette is placed over the pump head assembly;
an outlet tubing loop configured to be received about the rollers in the tube receiving channel of the outlet pump when the cassette is placed over the pump head assembly;
(c) a controller configured to receive rotational position information from the rotor position sensor of each pump and to instruct the motor of each pump to drive said rotor and selectively stop each rotor at a preselected rotational position.
2 . The fluid management system of claim 1 , wherein said sensor comprises an encoder.
3 . The fluid management system of claim 2 , wherein said encoder is formed integrally in the motor.
4 . The fluid management system of claim 2 , wherein said encoder is externally mounted to the motor or rotor.
5 . The fluid management system of claim 1 , wherein the controller is configured to selectively stop at least one rotor so that one roller is aligned with a centerline of the arcuate roller backing.
6 . The fluid management system of claim 1 , wherein the controller is configured to selectively stop both rotors so that each rotor has a roller aligned with a centerline of the adjacent arcuate roller backing.
7 . The fluid management system of claim 1 , wherein the pumps and the controller are housed together in a single enclosure.
8 . A method for loading a tubing cassette on a pump head assembly, said method comprising:
(a) providing a pump head assembly comprising:
an inlet pump having a rotor, a plurality of rollers, and an arcuate roller backing adjacent the rotor to define a tube receiving channel therebetween;
an outlet pump having a rotor, a plurality of rollers, and an arcuate roller backing adjacent the rotor to define a tube receiving channel therebetween;
an inlet motor configured to rotate the inlet pump rotor; and
an outlet motor configured to rotate the outlet pump rotor;
(b) providing a tubing cassette comprising:
an inlet tubing loop configured to be received about the rollers in the tube receiving channel of the inlet pump when the cassette is placed over the pump head assembly;
an outlet tubing loop configured to be received about the rollers in the tube receiving channel of the outlet pump when the cassette is placed over the pump head assembly;
(c) causing the rotors on the pump head to each align one roller with a centerline of the adjacent arcuate roller backing, wherein no other rollers are in the tube-receiving channel; and
(d) placing the cassette over the pump head assembly so that both the inlet tubing loop and the outlet tubing loop are received in the tube-receiving channels of the inlet and outlet pumps, respectively.
9 . The method of claim 8 , wherein causing the rotors on the pump head to each align one roller with a centerline of the adjacent arcuate roller comprises sensing a position of the rotors and automatically aligning the rotors.
10 . The method of claim 9 , wherein automatically aligning the rotors comprises aligning the rotors each time the cassette is removed from the pump head.
11 . The method of claim 10 , wherein aligning the rotors each time the cassette is removed from the pump head is performed by a controller.
12 . The method of claim 9 , wherein automatically aligning the rotors comprises manually instructing a controller to automatically align the rotors.
13 . The method of claim 9 , wherein automatically aligning the rotors comprises a controller automatically aligning the rotors each time the pump head is powered.
14 . The method of claim 9 , wherein sensing the position of the rotors comprises reading an encoder coupled to the motor or the rotor.