US 11,376,350 B2Granted

Methods and systems of fluid management in surgical procedures

AssigneeSmith & Nephew, Inc.

InventorsJonathan L. Gaspredes, Jean Woloszko, Rajitha Aluru, David J. Miller

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Abstract

Fluid management in surgical procedures. At least some of the example embodiments are methods including: pumping surgical fluid through a tube to a surgical site by a fluid controller operating in a first mode, the first mode comprising a first relationship of fluid flow and pressure drop across the tube and cannula, and the first mode comprising a first set of proportional, integral, and differential (PID) parameters; and then pumping surgical fluid through the tube to the surgical site with the fluid controller operating in a second mode, the second mode comprising a second relationship of fluid flow and pressure drop across the tube and cannula, the second relationship different than the first relationship, and the second mode comprising a second set of PID parameters used, the second set of PID parameters different than the first set of PID parameters.

Claims20

Dependent claims

A method comprising:

pumping surgical fluid by a pump through a tube and cannula to a surgical site by a fluid controller operating in a first mode, the first mode comprising a first relationship of fluid flow and pressure drop, and the first relationship of the first mode based on a first set of proportional, integral, and differential (PID) parameters used by a PID controller,
wherein pumping surgical fluid with the fluid controller in the first mode further comprises, for an incremental drop in joint pressure, increasing speed of the pump a first amount;
and
pumping surgical fluid by the pump through the tube to the surgical site with the fluid controller operating in a second mode, the second mode comprising a second relationship of fluid flow and pressure drop, the second relationship different than the first relationship, and the second relationship of the second mode based on a second set of PID parameters used by the PID controller implemented in the fluid controller, the second set of PID parameters different than the first set of PID parameters,
wherein pumping surgical fluid with the fluid controller in the second mode further comprises, for the incremental drop in joint pressure, increasing speed of the pump a second amount that is different than the first amount.

2 more elements

A fluid controller for surgical procedures, the fluid controller comprising:

a user interface configured to accept a setpoint joint pressure;
a positive displacement pump that comprises a motor;
a pressure sensor configured to read pressure at an outlet of the positive displacement pump;
a control system coupled to the user interface, the pressure sensor, and the motor of the positive displacement pump, the control system configured to control speed of the motor by way of a feedback control loop, the feedback control loop operates based on control loop parameters, a pressure measured by the pressure sensor, and the setpoint joint pressure;
during a surgical procedure with a tube and a cannula, the control system is configured to operate in a first mode that utilizes a first relationship of fluid flow through the positive displacement pump and joint pressure, and the first mode utilizes a first set of control loop parameters,
wherein in the first mode the control system is configured to, for an incremental drop in pressure measured by the pressure sensor, increase speed of the motor of the positive displacement pump a first amount;
and
during the surgical procedure with the tube and the cannula, the control system is configured to operate in a second mode that utilizes a second relationship of fluid flow through the positive displacement pump and joint pressure, the second mode different than the first mode, and the second mode utilizes a second set of control loop parameters, the second set of control parameters different than the first set of control parameters,
wherein in the second mode the control system is configured to, for the incremental drop in pressure measured by the pressure sensor, increase speed of the motor of the positive displacement pump a second amount less than the first amount.

6 more elements

A fluid controller for surgical procedures, the fluid controller comprising:

a user interface configured to accept a setpoint joint pressure;
a positive displacement pump that comprises a motor;
a pressure sensor configured to read pressure at an outlet of the positive displacement pump;
a control system coupled to the user interface, the pressure sensor, and the motor of the positive displacement pump, the control system configured to control speed of the motor by way of a feedback control loop, the feedback control loop operates based on control loop parameters, a pressure measured by the pressure sensor, and the setpoint joint pressure;
the control system is configured to operate in a first mode that utilizes a first relationship of fluid flow through the positive displacement pump and joint pressure, and the first mode utilizes a first set of control loop parameters;
and
the control system is configured to operate in a second mode that utilizes a second relationship of fluid flow through the positive displacement pump and joint pressure, the second mode different than the first mode, and the second mode utilizes a second set of control loop parameters, the second set of parameters different than the first set of parameters;
wherein in the first mode the control system is configured to, for an incremental drop in pressure measured by the pressure sensor, increase speed of the motor of the positive displacement pump a first amount;
wherein in the second mode the control system is configured to, for the incremental drop in pressure measured by the pressure sensor, increase speed of the motor of the positive displacement pump a second amount less than the first amount;
wherein in the first mode the control system is configured to, for an incremental drop in pressure measured by the pressure sensor for a first length of time, increase speed of the motor of the positive displacement pump a third amount;
and
wherein in the second mode the control system is configured to, for an incremental drop in pressure measured by the pressure sensor for a first length of time, increase speed of the positive displacement pump a fourth amount less than the third amount.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/166,754Filed 22 Oct 2018 · us provisional application
Priority: 16 Nov 2017
Published: US 2019/0143010 A116 May 2019
Granted: 5 Jul 2022
Term ends: Not estimatedThe source records don’t support an estimate.

Classification20 codes

A61B 17/320016
Surgical cutting instruments: endoscopic cutting instruments, e.g. arthroscopes, resectoscopes
A61B 1/015
Characterised by internal passages or accessories therefor: control of fluid supply or evacuation
A61M 1/74
Suction drainage systems: suction control
A61M 1/77
Suction drainage systems: suction-irrigation systems