System and method to establish current setpoint for ultrasonic transducer

Patent metadata

Field	Value
Publication number	US-10459740-B2
Application number	US-201615060684-A
Country	US
Kind code	B2
Filing date	Mar 4, 2016
Priority date	Mar 4, 2016
Publication date	Oct 29, 2019
Grant date	Oct 29, 2019

Abstract

Systems, devices and methods manage surgical instruments throughout their lifecycle by reprogramming a device to account for operational displacement of ultrasonic components based upon a diagnostic test. A diagnostic test tip is used with a surgical instrument to simulate device usage and capture capacitance and phase margin of the device. This information is used to calculate an optimal current to supply to the device during future procedures.

First claim

We claim:

1. An apparatus comprising:
(a) a reprogramming device comprising an instrument receptacle;
(b) a surgical instrument comprising an end effector, a generator connection and a memory, wherein the generator connection is configured to be connected to the instrument receptacle, wherein the memory is configured to store an original current value; and
(c) a test tip configured to be connected to the end effector;
wherein the reprogramming device is configured to:
(i) receive a set of phase margin data during a diagnostic operation of the surgical instrument with the test tip,
(ii) determine an original phase margin value based on the original current value using a phase margin equation, and
(iii) determine a displacement value based on the original phase margin value and a current phase margin value of the set of phase margin data using a transfer function,
(iv) determine a new current value based upon the original current value and the displacement value, and
(v) write the new current value to the memory of the surgical instrument, wherein the new current value is configured to be used by the surgical instrument to account for the displacement value during operation.

2. The apparatus of claim 1 , wherein the reprogramming device is selected from the group consisting of: a surgical generator, a computer, a mobile computing device, and a removable power supply.

3. The apparatus of claim 1 , wherein the surgical instrument comprises an ultrasonic surgical instrument.

4. The apparatus of claim 1 , wherein the new current value is determined using the equation:

Current
new

=

(

21.5
*

Current
original

)

Displacement
current

.

5. The apparatus of claim 1 , wherein one or more of the surgical instrument or the reprogramming device are configured to:
(i) prevent normal operation of the surgical instrument based upon the occurrence of a surgical instrument test interval,
(ii) display a notification via a display, the notification indicating that the test tip should be attached to the surgical instrument, and
(iii) resume normal operation of the surgical instrument after the reprogramming device writes the new current value to the memory of the surgical instrument.

6. The apparatus of claim 5 , wherein the surgical instrument test interval is configured to occur based on a variable time interval stored on the memory of the surgical instrument.

7. The apparatus of claim 1 , wherein the reprogramming device is configured to use the equation:
Phase Margin current =(Current original −199.7)/0.752,

as the phase margin equation.

8. The apparatus of claim 1 , wherein the reprogramming device is configured to provide an indication to a user that the new current value must be redetermined after about 50 uses of the surgical instrument.

9. The apparatus of claim 1 , wherein the new current value is configured to cause the surgical instrument to operate with a reduced likelihood of mechanical failure as compared to the original current value.

10. The apparatus of claim 1 , wherein the memory is further configured to store an original capacitance value, and the reprogramming device is further configured to:
(a) receive a set of capacitance data during the diagnostic operation of the surgical instrument,
(b) determine a capacitance difference between the original capacitance value and a current capacitance value of the set of capacitance data, and
(c) select, as the transfer function, either a thermal transfer function or a non-thermal transfer function, based upon the capacitance difference.

11. The apparatus of claim 10 , wherein, when the capacitance difference is greater than or equal to about 0.5 nF, the reprogramming device is configured to determine that the surgical instrument has been previously exposed to higher than typical heat levels.

12. The apparatus of claim 10 , wherein the reprogramming device is configured to select the thermal transfer function as the transfer function when the capacitance difference is greater than or equal to about 0.5 nF.

13. The apparatus of claim 10 , wherein the displacement value is determined using, as the transfer function, the equation:
Displacement current =(−0.00015)*(Phase Margin original )*(Phase Margin current )+(−0.03974)*(Phase Margin current )+0.080442*(Phase Margin original )+20.22,

when the transfer function is a thermal transfer function.

14. The apparatus of claim 10 , wherein the displacement value is determined using, as the transfer function, the equation:
Displacement current =(−0.00015)*(Phase Margin original )*(Phase Margin current )+(−0.03974)*(Phase Margin current )+0.080442*(Phase Margin original )+20.22+1.2,

when the transfer function is a non-thermal transfer function.

15. A surgical instrument reprogramming device comprising:
(a) an instrument receptacle; and
(b) a processor configured to operate and communicate with a surgical instrument when the surgical instrument is attached to the instrument receptacle;
wherein the processor is configured to:
(i) cause the surgical instrument to perform a diagnostic operation of an end effector of the surgical instrument and generate a set of phase margin data and a set of capacitance data during the diagnostic operation,
(ii) receive an original current value and an original capacitance value from a memory of the surgical instrument,
(iii) determine:
(A) an original phase margin value based on the original current value using a phase margin equation, and
(B) a capacitance difference between the original capacitance value and a current capacitance value of the set of capacitance data,

(iv) select, as a transfer function, either a thermal transfer function or a nonthermal transfer function, based upon the capacitance difference,
(v) determine a displacement value based on the original phase margin value and a current phase margin value of the set of phase margin data using the transfer function,
(vi) determine a new current value based upon the original current value and the displacement value, and
(vii) write the new current value to the memory of the surgical instrument, wherein the new current value is configured to be used by the surgical instrument to account for the displacement value during operation.

Assignees

• Ethicon Endo Surgery Llc
• Ethicon Llc

Inventors

• Dannaher William D
• Weizman Patrick A
• Wiener Eitan T

Classifications

• A61B2017/00039

  Electric or electromagnetic phenomena other than conductivity, e.g. capacity, inductivity, Hall effect · CPC title

• A61B2017/00477

  Coupling (A61B2017/0046 takes precedence) · CPC title

• A61B2017/00132

  Setting operation time of a device (A61B2017/00123 takes precedence) · CPC title

• A61B34/25

  User interfaces for surgical systems · CPC title

• G06F9/44505 Primary

  Configuring for program initiating, e.g. using registry, configuration files · CPC title