Modular battery powered handheld surgical instrument with voltage sag resistant battery pack

Patent metadata

Field	Value
Publication number	US-2017207467-A1
Application number	US-201615382285-A
Country	US
Kind code	A1
Filing date	Dec 16, 2016
Priority date	Jan 15, 2016
Publication date	Jul 20, 2017
Grant date	—

Abstract

A system including a battery assembly for use in a modular handheld surgical instrument, wherein the battery assembly includes a primary battery pack, a secondary battery pack, and a circuit configured to supply a first output voltage to a first load of the modular handheld surgical instrument via the primary battery pack, supply a second output voltage to a second load of the modular handheld surgical instrument via the secondary battery pack, and upon sensing a sagging voltage from the primary battery pack, supply a supplemental voltage to the first load, via the secondary battery pack, to prevent the battery assembly from supplying an output voltage below a predetermined threshold output voltage under the first load.

First claim

1 . A system, comprising:
a battery assembly for use in a modular handheld surgical instrument, wherein the battery assembly comprises: a primary battery pack; a secondary battery pack; and a circuit configured to: supply a first output voltage to a first load of the modular handheld surgical instrument via the primary battery pack; supply a second output voltage to a second load of the modular handheld surgical instrument via the secondary battery pack; and upon sensing a sagging voltage from the primary battery pack, supply a supplemental voltage to the first load, via the secondary battery pack, to avoid supplying the first load an output voltage below the first output voltage.

2 . The system of claim 1 , wherein the first load comprises at least one of a motor driven by a motor control circuit, an ultrasonic transducer driven by a first energy circuit, or a high-frequency current electrode driven by a second energy circuit.

3 . The system of claim 1 , wherein the second load comprises control electronics driven by a handle electronics circuit and at least one of a motor driven by a motor control circuit, an ultrasonic transducer driven by a first energy circuit, or a high-frequency current electrode driven by a second energy circuit.

4 . The system of claim 1 , wherein the circuit comprises:
a power supply circuit positioned between the secondary battery pack and the first load, wherein the power supply circuit is configured to produce a power supply output voltage from an input voltage supplied by the secondary battery pack; and a diode positioned between an output of the power supply circuit and the first load, wherein the diode is configured to sense the sagging voltage from the primary battery pack.

5 . The system of claim 4 , wherein the diode is configured to conduct the supplemental voltage when the sagging voltage drops below the power supply output voltage by more than a turn-on voltage associated with the diode.

6 . The system of claim 5 , wherein the supplemental voltage comprises the power supply output voltage less the diode turn-on voltage.

7 . The system of claim 5 , wherein the diode is configured to conduct the supplemental voltage until the sagging voltage exceeds the power supply output voltage to turn off the diode.

8 . The system of claim 4 , wherein the power supply circuit comprises a switch mode power supply circuit or a linear power supply circuit.

9 . The system of claim 4 , wherein the circuit is configured to be resistant to radiation sterilization.

10 . The system of claim 4 , wherein the secondary battery pack comprises a plurality of rechargeable batteries, and wherein the circuit further comprises a charger configured to charge the plurality of rechargeable batteries to a full charge.

11 . The system of claim 10 , wherein the charger is configured to charge the plurality of rechargeable batteries when the first load is inactive.

12 . The system of claim 1 , wherein the primary battery pack comprises a plurality of energy cells, and wherein the secondary battery pack comprises a plurality of energy cells.

13 . The system of claim 12 , wherein the plurality of energy cells of the primary battery pack comprise a chemical composition different than the plurality of energy cells of the secondary battery pack.

14 . The system of claim 12 , wherein the plurality of energy cells of the primary battery pack and the plurality of energy cells of the secondary battery pack are non-rechargeable such that the battery assembly is disposable.

15 . A voltage sag resistant battery assembly for use in a modular handheld surgical instrument, the battery assembly comprising:
a first battery pack; a second battery pack; and circuity to: supply a first output voltage to a first load via the first battery pack; supply a second output voltage to a second load via the second battery pack; and upon sensing a sagging voltage from the first battery pack, supply a supplemental voltage to the first load, via the second battery pack, to restore the sagging voltage to the first output voltage.

16 . The battery assembly of claim 15 , wherein the circuit comprises:
a power supply circuit positioned between the second battery pack and the first load, wherein the power supply circuit is configured to produce a power supply output voltage from an input voltage supplied by the second battery pack; and a diode positioned between an output of the power supply circuit and the first load, wherein the diode is configured to sense the sagging voltage from the first battery pack.

17 . The battery assembly of claim 15 , wherein the second battery pack comprises a plurality of rechargeable batteries, and wherein the circuit further comprises a charger configured to charge the plurality of rechargeable batteries to a full charge.

18 . A system, comprising:
a modular handheld surgical instrument; and a battery assembly coupled to the modular handheld surgical instrument, wherein the battery assembly comprises: a primary battery pack including at least one energy cell; a secondary battery pack including at least one energy cell; and a circuit configured to:
supply a first output voltage to a first load of the modular handheld surgical instrument via the primary battery pack; and
upon sensing a sagging voltage from the primary battery pack, supply a compensating voltage to the first load, via the secondary battery pack, to prevent the battery assembly from supplying an output voltage below a predetermined threshold output voltage under the first load.

19 . The system of claim 18 , wherein the circuit comprises:
a power supply circuit positioned between the secondary battery pack and the first load, wherein the power supply circuit is configured to produce a power supply output voltage from an input voltage supplied by the secondary battery pack; and a diode positioned between an output of the power supply circuit and the first load, wherein the diode is configured to sense the sagging voltage from the primary battery pack, and wherein the compensating voltage comprises the power supply output voltage less a voltage drop associated with the diode.

20 . The system of claim 19 , wherein the compensating voltage supplements the sagging voltage to meet the predetermined threshold output voltage.

Assignees

• Ethicon Endo Surgery Llc

Inventors

• Shelton Iv Frederick E
• Yates David C
• Houser Kevin L

Classifications

• A61B2018/00988

  Means for storing information, e.g. calibration constants, or for preventing excessive use, e.g. usage, service life counter · CPC title

• A61B2017/320072

  Working tips with special features, e.g. extending parts · CPC title

• A61B2018/00904

  Automatic detection of target tissue · CPC title

• A61B2018/00601

  Cutting · CPC title

• A61B2017/00039

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