Wake-up system and method for powered surgical instruments

<u>BACKGROUND</u>

Technical Field

0001The present disclosure relates to surgical instruments, devices and/or systems for performing minimally invasive surgical procedures and methods of use thereof. More specifically, the present disclosure relates to systems and methods for transitioning a powered surgical instrument from a sleep state to an active state.

Description of Related Art

0002A number of surgical instrument manufacturers have developed product lines with proprietary drive systems for operating and/or manipulating electromechanical surgical instruments. Some electromechanical surgical instruments include a handle assembly, which is reusable, and replaceable loading units and/or single use loading units or the like that are selectively connected to the handle assembly prior to use and then disconnected from the handle assembly following use, in order to be disposed of or in some instances sterilized for re-use.

0003In order to preserve battery life, all or some of the components of the electromechanical surgical instrument are placed in a sleep mode when the instrument is not in use. In order to place the instrument in an active state, the electromechanical surgical instrument needs to poll a separate pin or line to determine whether a component of the electromechanical surgical instrument has been attached to the handle assembly. In order to poll the separate pin or line, a processor in the surgical instrument needs to periodically wake-up, thus shortening the battery life. Further, the processor is required to interrogate the bus to determine if a component has been attached to the surgical instrument in order to transition the instrument into an active state.

0004<patcit id="pcit0001" dnum="US20110105945A"><text>US2011/0105945</text></patcit> discloses a surgical system having a control circuit with a motion detector, a timer circuit and a battery dwell circuit. The circuit is configured to conserve the battery by providing electrical power only to the motion detector after a predetermined time following a last physical movement of the device, and to provide electrical power from the battery also to the electrical assembly when a physical movement of the device assembly is detected.

<u>SUMMARY</u>

0005An electromechanical surgical system is provided in an aspect of the present disclosure. The system includes an end effector configured to perform at least one function and an adapter assembly being arranged for selectively interconnecting the end effector and a hand-held surgical instrument. A one-wire bidirectional serial communications interface extends through the end effector, the adapter assembly, and the hand-held instrument. The hand-held surgical instrument has an instrument housing defining a connecting portion for selectively connecting with the adapter assembly. The hand-held surgical instrument includes a master circuit coupled to the one-wire bidirectional serial communications interface and configured to identify or control the adapter assembly or the end effector. A power source is coupled to the one-wire bidirectional serial communications interface and is configured to provide power to the adapter assembly or the end effector. A first switch connects the master circuit to the one-wire bidirectional serial communications interface and a second switch connects the power source to the one-wire bidirectional serial communications interface. A processor controls operation of the hand-held surgical instrument. The processor has a wake-up pin connected to the one-wire bidirectional serial communications interface. The wake-up pin is configured to receive a presence pulse from the end effector or the adapter.

0006In some embodiments, the first switch is connected to a first pin of the processor and the second switch is connected to a second pin on the processor. If the processor is in a sleep state, the processor transmits a first signal on the first pin to disconnect the master circuit from the one-wire bidirectional serial communications interface. The processor also transmits a second signal on the second pin to connect the power source to the one-wire bidirectional serial communications interface.

0007In some embodiments, the adapter assembly generates the presence pulse when the adapter assembly is connected to the hand-held instrument. The processor transitions from the sleep state to an active state when the wake-up pin receives the presence pulse. The adapter assembly includes an integrated circuit having an identification code stored thereon which is transmitted to the master circuit after the processor is placed in the active state and the master circuit requests the identification code from the adapter assembly.

0008In other embodiments, the end effector generates the presence pulse when the end effector is connected to the hand-held instrument. The processor transitions from the sleep state to an active state when the wake-up pin receives the presence pulse. The end effector includes an integrated circuit having an identification code stored thereon which is transmitted to the master circuit after the processor is placed in the active state and the master circuit requests the identification code from the end effector.

0009In another aspect of the present disclosure, a method for waking up an electromechanical surgical system having a housing that is couplable to a slave device is provided. In the method, a one-wire master circuit is disconnected from a one-wire bidirectional serial communications interface while a power source is connected to the one-wire bidirectional serial communications interface. The system detects a presence pulse from the slave device and if the presence pulse is detected, the electromechanical surgical system is placed in an active state.

0010In some embodiments, the slave device is an adapter, a single use loading unit, or a multi-use loading unit.

0011In some embodiments, the method also includes interrogating the one-wire bidirectional serial communications interface for the slave device when the electromechanical surgical system is placed in the active state.

<u>BRIEF DESCRIPTION OF THE DRAWINGS</u>

0012The above and other aspects, features, and advantages of the present disclosure will become more apparent in light of the following detailed description when taken in conjunction with the accompanying drawings in which: <ul id="ul0001" list-style="none" compact="compact"><li><figref idref="f0001">Fig. 1</figref> is a perspective view of a surgical stapling instrument for use with a chip assembly according to embodiments of the present disclosure;</li><li><figref idref="f0001">Fig. 2</figref> is a perspective view of the surgical stapling instrument of <figref idref="f0001">Fig. 1</figref> showing the handle assembly, adapter assembly, and loading unit in a separated configuration;</li><li><figref idref="f0002">Fig. 3</figref> is a system block diagram of the surgical stapling instrument of <figref idref="f0001">Fig. 1</figref>; and</li><li><figref idref="f0003">Fig. 4</figref> is a flow chart depicting a wake-up method for the surgical stapling instrument of <figref idref="f0001">Fig. 1</figref>.</li></ul>

<u>DETAILED DESCRIPTION OF EMBODIMENTS</u>

0013Embodiments of the presently disclosed electromechanical surgical system, instrument and/or device are described in detail with reference to the drawings, in which like reference numerals designate identical or corresponding elements in each of the several views.

0014This description may use the phrases "in an embodiment," "in embodiments," "in some embodiments," or "in other embodiments," which may each refer to one or more of the same or different embodiments in accordance with the present disclosure. For the purposes of this description, a phrase in the form "A or B" means "(A), (B), or (A and B)". For the purposes of this description, a phrase in the form "at least one of A, B, or C" means "(A), (B), (C), (A and B), (A and C), (B and C), or (A, B and C)".

0015The term "clinician" refers to any medical professional (i.e., doctor, surgeon, nurse, or the like) performing a medical procedure involving the use of embodiments described herein. As shown in the drawings and described throughout the following description, as is traditional when referring to relative positioning on a surgical instrument, the term "proximal" or "trailing" refers to the end of the apparatus which is closer to the clinician and the term "distal" or "leading" refers to the end of the apparatus which is farther away from the clinician.

0016The systems described herein may also utilize one or more controllers to receive various information and transform the received information to generate an output. The controller may include any type of computing device, computational circuit, or any type of processor or processing circuit capable of executing a series of instructions that are stored in a memory. The controller may include multiple processors and/or multicore central processing units (CPUs) and may include any type of processor, such as a microprocessor, digital signal processor, microcontroller, or the like. The controller may also include Field Programmable Gate Arrays (FPGA) and Complex Programmable Logic Devices (CPLD). The controller may also include a memory to store data and/or algorithms to perform a series of instructions.

0017Any of the herein described methods, programs, algorithms or codes may be converted to, or expressed in, a programming language or computer program. A "Programming Language" and "Computer Program" is any language used to specify instructions to a computer, and includes (but is not limited to) these languages and their derivatives: Assembler, Basic, Batch files, BCPL, C, C+, C++, Delphi, Fortran, Java, JavaScript, Machine code, operating system command languages, Pascal, Perl, PL1, scripting languages, Visual Basic, VHDL, Verilog, metalanguages which themselves specify programs, and all first, second, third, fourth, and fifth generation computer languages. Also included are database and other data schemas, and any other metalanguages. For the purposes of this definition, no distinction is made between languages which are interpreted, compiled, or use both compiled and interpreted approaches. For the purposes of this definition, no distinction is made between compiled and source versions of a program. Thus, reference to a program, where the programming language could exist in more than one state (such as source, compiled, object, or linked) is a reference to any and all such states. The definition also encompasses the actual instructions and the intent of those instructions.

0018Any of the herein described methods, programs, algorithms or codes may be contained on one or more machine-readable media or memory. The term "memory" may include a mechanism that provides (e.g., stores and/or transmits) information in a form readable by a machine such a processor, computer, or a digital processing device. For example, a memory may include a read only memory (ROM), random access memory (RAM), magnetic disk storage media, optical storage media, flash memory devices, or any other volatile or non-volatile memory storage device. Code or instructions contained thereon can be represented by carrier wave signals, optical signals, digital signals, and by other like signals.

0019As used herein, the term "slave device" may refer to any device that is attached a powered surgical instrument. For example, a slave device may be an adapter, a clamshell, single use loading unit (SULU), a multi-use loading unit (MULU), etc. In the embodiments described herein, each slave device includes a chip that initiates a presence pulse which will be described below.

0020In embodiments described herein, a powered surgical instrument is couplable to interchangeable adapters and different loading units. For example, the loading units may be a SULU or a MULU. The powered surgical instrument has a handle that includes a processor which controls operation of the powered surgical instrument. The processor can be placed in a sleep state to conserve battery life and transitioned into an active state when one or more slave devices are attached to the instrument. When one or more slave devices are connected to the instrument, the slave devices generate a presence pulse that is transmitted via a one-wire bidirectional serial communication interface to a wake-up pin on the processor. As such, the processor does not need to wake-up on its own thereby saving power. Further, the processor does not need to interrogate a bus on any other type of wake-up condition, which saves time. Additionally, the need for an extra pin going to a distal slave device or any external logic required to generate a wake-up signal is eliminated.

0021With reference initially to <figref idref="f0001">Figs. 1 and 2</figref>, a powered surgical instrument including a one-wire bidirectional serial communication system according to the present disclosure is shown generally as stapler 10. Stapler 10 includes a handle assembly 12, an adapter assembly 14 extending distally from handle assembly 12, and a loading unit 16 selectively secured to a distal end of adapter assembly 14. A detailed description of handle assembly 12, adapter assembly 14, and loading unit 16 is provided in commonly-owned <patcit id="pcit0002" dnum="US20120089131A" dnum-type="L"><text>U.S. Patent Appl. Publ. No. 2012/0089131</text></patcit>.

0022Handle assembly 12 includes a lower housing portion 17, an intermediate housing portion 18 extending from and/or supported on lower housing portion 17, and an upper housing portion 19 extending from and/or supported on intermediate housing portion 18. Intermediate housing portion 18 and upper housing portion 19 are separated into a distal half-section 20a that is integrally formed with, and extends from, the lower housing portion 17, and a proximal half-section 20b joined to distal half-section 20a by any suitable manner of attachment, such as without limitation, ultrasonic welding and/or a plurality of fasteners. When joined, distal and proximal half-sections 20a, 20b form a handle housing 21 defining a cavity therein which houses a circuit board that includes a controller (not shown), and a drive mechanism (not shown).

0023Lower housing portion 17 includes a door 13 pivotally connected thereto for accessing a cavity formed in lower housing portion 17 for retaining a battery (not shown) therein. It is contemplated that stapler 10 may be powered by any number of power sources, such as, for example and without limitation, a fuel cell, a power cord connected to an external power source, and so forth.

0024Adapter assembly 14 includes a drive coupler 22 at a proximal end thereof and coupled to a loading unit coupler 15 at a distal end thereof. Distal half-section 20a of upper housing portion 19 defines a nose or connecting portion 11 configured to operably receive drive coupler 22 of adapter assembly 14. Loading unit 16 includes an adapter coupler 27 configured to operably receive loading unit coupler 15 of adapter assembly 14.

0025Upper housing portion 19 of handle housing 21 encloses a drive mechanism (not shown) configured to drive shafts and/or gear components (not shown) in order to perform the various operations of stapler 10. In particular, the drive mechanism is configured to drive shafts and/or gear components in order to selectively move a tool assembly 23 of loading unit 16 relative to a proximal body portion 24 of loading unit 16, to rotate loading unit 16 about a longitudinal axis "X-X" (<figref idref="f0001">Fig. 1</figref>) relative to handle housing 21, to move an anvil assembly 25 relative to cartridge assembly 26 of loading unit 16, and/or to fire a stapling and cutting cartridge within cartridge assembly 26 of loading unit 16.

0026Turning to <figref idref="f0002">Fig. 3</figref>, handle assembly 12 includes a controller 30 that controls operation of the stapler 10. Controller 30 includes a processor 32 and a one-wire master circuit 34. When stapler 10 is not in use, processor 32 is placed in a sleep state to conserve battery life. The processor 32 may transition from a sleep state to an active state upon an instruction from a clinician, attaching an adapter 14 to the handle assembly 12, or attaching a loading unit 16 to an adapter 14 that is already coupled to the handle assembly 12.

0027The one-wire master circuit 34 is the main controller of a one-wire bidirectional serial communications interface or bus 36 and is responsible for finding slave devices on the bus 36 when the slave device(s) announce their presence. The one-wire master circuit 34 also issues commands to the slave devices. There may be only one master circuit 34 on a given bus 36. The master circuit 34 is coupled to the bus 36 via a switch 38 that receives an open/close instruction from processor 32 via pin 40. A switch 42 couples the bus 36 to a power source 44 based on an open/close instruction from processor 32 via pin 46. A wake-up pin 48 on processor 32 detects a presence pulse from the slave devices when the slave devices are coupled to the housing 12.

0028Adapter 14 and loading unit 16 include a chip 50 and 52, respectively, that are in electrical communication with bus 36. Chips 50 and 52 are part of an authentication system that prevent unauthorized use of the surgical stapler 10. Chips 50 and 52 are capable of storing the specifications of adapter 14 or loading unit 16, such as, without limitation, cartridge size, staple arrangement, staple length, clamp-up distance, date of manufacture, expiration date, compatibility characteristics, a unique identifier (e.g., a serial number), and/or number of uses, and transmitting the specifications to handle assembly 12. In some embodiments, chips 50 and 52 include an erasable programmable read only memory ("EPROM") chip. In this manner, the handle assembly 12 may adjust the firing forces, firing stroke, and/or other operational characteristics thereof in accordance with the specifications of loading unit 16 that are transmitted from chip 52. It is further envisioned that chips 50 and 52 may include write capabilities which allow handle assembly 12 to communicate to chips 50 and 52 that the associated adapter 14 or loading unit 16 has been used, which can prevent reloading or reuse of an expended reload assembly, or any other unauthorized use. A detailed description of a surgical stapler 10 with an authentication system is provided in commonly-owned <patcit id="pcit0003" dnum="US17210914A" dnum-type="L"><text>U.S. Patent Appl. No. 14/172,109 filed on February 4, 2014</text></patcit>, published as <patcit id="pcit0004" dnum="US20150216525A1"><text>US2015-0216525 A1</text></patcit>.

0029Turning to <figref idref="f0003">Fig. 4</figref>, operation of a wake-up procedure for surgical stapler 10 will be discussed with reference to <figref idref="f0001 f0002">Figs. 1-3</figref>. In step s102, processor 32 is placed in a sleep state. The sleep state may be initiated based on an instruction from a clinician or if the surgical stapler 10 is inactive for a predetermined period of time. In step s104, a signal from pin 40 of processor 32 causes switch 38 to disconnect the one-wire master circuit 34 from the bus 36. Further, in step s102 a signal from pin 46 causes switch 42 to connect the bus 36 to power source 44. By connecting power source 44 to the bus, any slave device that is attached to the handle 12 can receive power in order to generate a presence pulse. In step s106, the wake-up pin 48 checks for a presence pulse from any connected slave device. The presence pulse is an automatically generated pulse (480 microseconds to ground) transmitted by the slave device after the slave device receives power. If a presence pulse is not found in step s108, the sleep state is maintained in step s110 and the procedure returns to step s106. On the other hand, if a presence pulse is detected in step s108, the procedure proceeds to step s112, where the processor 32 transitions to an active state. In step s114, the one-wire master circuit 34 is connected to the bus 36 while the power supply 44 is disconnected from the bus 36. When the processor 32 transitions from the sleep state to the active state and the one-wire master circuit 34 is connected to the bus 36, the one-wire master circuit 34 interrogates the bus for the new slave device.

0030Although the illustrative embodiments of the present disclosure have been described herein with reference to the accompanying drawings, it is to be understood that the disclosure is not limited to those precise embodiments, and that various other changes and modifications may be effected therein by one skilled in the art without departing from the scope of the disclosure as defined by the claims appended hereto.