Device and method for determining a switch-off time of a medical instrument

Patent metadata

Field	Value
Publication number	US-2022280223-A1
Application number	US-202017632870-A
Country	US
Kind code	A1
Filing date	Aug 6, 2020
Priority date	Aug 7, 2019
Publication date	Sep 8, 2022
Grant date	—

Abstract

A method for determining a switch-off time of a medical instrument includes measuring the duration for which the temperature of a tissue is above 85° Celsius, preferably above 95° Celsius, calculating, preferably online, the mean temperature from the first time when 85° Celsius, preferably 95° Celsius is reached, measuring and/or calculating the energy input until 85° Celsius, preferably 95° Celsius, and preferably below 110° Celsius, preferably below 100° Celsius is reached, calculating a parameter SP, which links the above mentioned results, and switches off at a predetermined value. The method can be practiced with a medical instrument as well as an application and a storage medium.

First claim

1 . A method for determining a switch-off time of a medical instrument, comprising the steps of:
measuring a duration for which a temperature of a tissue is above 85° Celsius; calculating a mean temperature as from a first time when the temperature of the tissue reaches 85° Celsius; measuring and/or calculating an energy input until the temperature of the tissue reaches 85° Celsius; calculating a parameter SP, which links the duration, the mean temperature and the energy input; and switching off the medical instrument at a predetermined value of the parameter SP.

2 . The method according to claim 1 , wherein the parameter SP is a result from a duration for which the temperature of the tissue is above 85° Celsius, multiplied by the mean temperature as from the first time when the temperature of the tissue reaches 85° Celsius, divided by the energy input until the temperature of the tissue reaches 85° Celsius.

3 . The method according to claim 1 , wherein the method further comprises the steps of:
emitting light with an excitation spectrum into of the tissue by at least one illumination; receiving a remission of light with a remission spectrum from the tissue by at least one detector; converting the remission spectrum into a detector signal with the detector; sending the detector signal to a calculating unit, calculating the remission spectrum from the detector signal with the calculating unit, calculating an absorption spectrum of the tissue by comparing the excitation spectrum with the remission spectrum using the calculating unit, calculating at least one absorption maximum from the absorption spectrum by means using the calculating unit; and calculating a temperature in the tissue by comparing the absorption maximum with at least one reference using the calculating unit.

4 . The method according to claim 2 , wherein the method further comprises the step of:
storing at least one reference as an absorption maximum at a certain temperature in a storage medium in the calculating unit.

5 . The method according to claim 2 , wherein the method further comprises the step of:
applying the at least one illumination and the detector to the tissue.

6 . The method according to claim 2 , further comprising the step of:
controlling and/or adjusting and/or switching off a medical instrument using the calculating unit based on the mean temperature and/or a tissue impedance.

7 . The method according to claim 6 , wherein the controlling and/or adjusting and/or switching off takes place when a predetermined temperature is reached at a temperature that is greater than 85° Celsius.

8 . The method according to claim 6 , wherein the controlling and/or adjusting and/or switching off of the medical instrument takes place in real time.

9 . The method according to claim 2 , wherein temperature measurement is performed during a sealing process.

10 . The method according to claim 3 , wherein the at least one detector is adapted to measure remission spectra in the NIR range of 1000 nm to 1700 nm.

11 . The method according to claim 2 , wherein the at least one illumination and the at least one detector are spaced apart.

12 . (canceled)

13 . A storage medium of a medical instrument, wherein the steps of claim 1 are stored on the storage medium.

14 . A medical instrument for sealing and/or cutting of tissue, the medical instrument comprising:
a temperature measurement device adapted to measure a temperature of a tissue; and a calculating unit, wherein the medical instrument is adapted to measure a duration for which the temperature of the tissue is above 85° Celsius, wherein the calculating unit is adapted to calculate a mean temperature as from which the temperature of the tissue reaches 85° Celsius for the first time, wherein the medical instrument is further adapted to measure and/or to calculate an energy input until the temperature of the tissue reaches 85° Celsius, wherein the calculating unit is adapted to calculate a parameter SP which links the duration, the mean temperature and the energy input, and wherein the medical instrument, is adapted to switch off at and/or as a result of the parameter SP reaching a predetermined value.

15 . The medical instrument according to claim 14 , further comprising at least one instrument branch that forms at least one energizable electrode for sealing and/or cutting of tissue, or is arranged in or on the at least one energizable electrode, wherein energization of the at least one energizable electrode is controllable and/or adjustable by the calculating unit.

Assignees

• Aesculap Ag

Inventors

• Huber Christian
• Rothweiler Christoph
• Russ Detlef
• Fugger Oliver
• Hibst Raimund

Classifications

• A61B2018/00875

  Resistance or impedance · CPC title

• A61B2018/00589

  Coagulation · CPC title

• A61B2018/00767

  Voltage · CPC title

• A61B5/4848

  Monitoring or testing the effects of treatment, e.g. of medication · CPC title

• A61B2018/00708

  switching the power on or off · CPC title