US20010007944A1 - System for controlling a motor driven surgical cutting instrument - Google Patents
System for controlling a motor driven surgical cutting instrument Download PDFInfo
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- US20010007944A1 US20010007944A1 US09/789,040 US78904001A US2001007944A1 US 20010007944 A1 US20010007944 A1 US 20010007944A1 US 78904001 A US78904001 A US 78904001A US 2001007944 A1 US2001007944 A1 US 2001007944A1
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- cutting
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/32—Surgical cutting instruments
- A61B17/320016—Endoscopic cutting instruments, e.g. arthroscopes, resectoscopes
- A61B17/32002—Endoscopic cutting instruments, e.g. arthroscopes, resectoscopes with continuously rotating, oscillating or reciprocating cutting instruments
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/00017—Electrical control of surgical instruments
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/00017—Electrical control of surgical instruments
- A61B2017/00022—Sensing or detecting at the treatment site
- A61B2017/00039—Electric or electromagnetic phenomena other than conductivity, e.g. capacity, inductivity, Hall effect
Definitions
- the present invention relates generally to systems for controlling motor driven surgical cutting instruments, and more specifically to such systems for controlling the position of the surgical cutting instrument upon stoppage of the drive motor. More particularly, the invention relates to controlling a brush type DC motor used to drive the cutting instrument.
- Minimally invasive surgical cutting instruments are known and widely used to excise and remove biological tissue.
- Such instruments typically include a handpiece comprising a cutting tool housed within an elongated cannula, wherein the tool is disposed adjacent to an opening at or near the tip of the cannula.
- the cannula itself is configured for percutaneous insertion into a body via a small incision, and is manually maneuvered into position for tissue excision and removal.
- tissue adjacent to the opening near the tip of the cannula is typically excised by driving the cutting tool with either a rotary or reciprocal motion relative to the cannula, whereby tissue is drawn into the opening (typically via vacuum) and excised by the cutting tool.
- Brushed DC motors as compared with brushless DC motors, are typically torque driven rather than speed driven, and accordingly have a substantial rotational resistance associated therewith.
- the Krause et al. system may effectively provide for controlled stopping of a surgical cutting instrument driven by a brushless DC motor, such elaborate control techniques are unnecessary when driving a brushed DC motor. What is therefore needed is a simple and inexpensive control technique for controlling the stop position of a brushed DC motor driven surgical instrument.
- the control system should be operable to control the position of the cutting tool when the drive motor is turned off so that unexcised tissue is not trapped between the cutting tool and the opening near the tip of the cannula.
- a tissue cutting apparatus comprises an elongated housing configured for insertion into a body site, the housing having a first end defining an opening adjacent thereto.
- a tissue cutting tool is disposed within the housing and defines at least one cutting surface configured for movement relative to the housing adjacent the opening to thereby excise tissue extending into the opening.
- a brushed DC motor drives a drive shaft coupled to the cutting tool. While the brushed motor is rotary, the cutting tool can be driven in a rotary or reciprocating fashion with an appropriate transmission mechanism between the drive shaft and cutting tool. Means are provided for sensing a predefined position of the drive shaft relative to the housing and producing a stop position signal corresponding thereto. In one embodiment, the sensing means is a Hall effect sensor and magnet arranged between the motor and the cutting tool.
- a motor control circuit is provided to control operation of the motor.
- the circuit includes a pulse-width-modulated controller.
- the motor control circuit utilizes a current feedback to control the motor current.
- the motor control circuit is operable in response to a motor stop signal to stop the motor with the drive shaft at the predefined position.
- Certain features of the motor control circuit are configured to take advantage of the natural braking characteristics of the motor and cutting tool in order to stop the motor at the appropriate position. This predefined position is arranged to orient the cutting surface of the cutting tool relative to the opening to avoid trapping unexcised tissue between the cutting surface and a boundary of the opening.
- the motor control circuit includes an op amp driven current feedback loop to control the current provided to the brushed motor.
- a switch is interposed in the feedback loop to disable the current feedback signal when it is desired to stop the motor. Eliminating the current feedback improves the braking characteristics of the motor and handpiece so that the cutting blade can be accurately stopped in its predetermined position.
- the control circuit can respond to a motor stop signal to activate the feedback loop switch. The motor is powered until the stop position signal is received indicating that the drive shaft is at the predetermined position, at which point current to the motor is ceased to stop the cutter.
- control circuit is responsive to a motor stop signal to drive the motor at a predefined motor speed less than the cutter operating speed.
- the control circuit is also responsive to a second occurrence of the stop position signal to deactivate the motor with the drive shaft at the predefined position.
- One object of the present invention is to provide an improved surgical cutting apparatus that is operable to avoid trapping unexcised tissue between the cutting tool and a boundary of the opening in the cannula when the cutting tool drive motor is deactivated.
- Another object of the present invention is to provide such improvements to surgical cutting apparatuses that have either a rotating cutting tool or a linearly reciprocating cutting tool.
- FIG. 1 is a diagrammatic illustration of one embodiment of a system for controlling the brushed DC motor of a motor driven surgical instrument, in accordance with the present invention.
- FIG. 2 is a diagrammatic illustration of the system of FIG. 1 showing further details of one embodiment of a motor control unit and the surgical instrument.
- FIG. 3A is a cross sectional illustration of the handpiece of FIG. 2 showing details of a surgical instrument stop position identification mechanism for a rotationally driven motor shaft.
- FIG. 3B is a cross sectional illustration of the handpiece of FIG. 2 showing details of a surgical instrument stop position identification mechanism for a linearly driven motor shaft.
- FIG. 4A is a cross sectional illustration of one embodiment of a rotary surgical cutting tool disposed within the cannula of the surgical instrument shown in FIG. 2.
- FIG. 4B is a cross sectional illustration of the surgical cutting tool of FIG. 4A, viewed along section lines 4 B- 4 B, showing the cutting surfaces of the cutting tool positioned remote from the cannula opening.
- FIG. 4C is a cross sectional illustration of the surgical cutting tool of FIG. 4A, viewed along section lines 4 C- 4 C, showing one of the cutting surfaces of the cutting tool excising a portion of the tissue forced into the opening near the cannula tip.
- FIG. 4D is a cross sectional illustration of the surgical cutting tool of FIG. 4A, viewed along section lines 4 D- 4 D, showing one of the cutting surfaces of the cutting tool trapping a portion of the tissue between the cutting tool and the opening near the tip of the cannula, which condition is avoided in accordance with the present invention.
- FIG. 5A is a cross sectional illustration of another embodiment of a rotary surgical cutting tool disposed within the cannula of the surgical instrument shown in FIG. 2.
- FIG. 5B is a cross sectional illustration of the surgical cutting tool of FIG. 5A, viewed along section lines 5 B- 5 B, showing the cutting surface of the cutting tool positioned adjacent to the cannula opening.
- FIG. 5C is a cross sectional illustration of the surgical cutting tool of FIG. 5A, viewed along section lines 5 C- 5 C, showing the cutting surface of the cutting tool disposed remote from the opening near the cannula tip after excising a portion of the tissue extending into the cannula opening.
- FIG. 5D is a cross sectional illustration of the surgical cutting tool of FIG. 5A, viewed along section lines 5 D- 5 D, showing the cutting surface of the cutting tool trapping a portion of the tissue between the cutting tool and the opening near the tip of the cannula, which condition is avoided in accordance with the present invention.
- FIG. 6A is a cross sectional illustration of one embodiment of a linearly reciprocating surgical cutting tool disposed within the cannula of the surgical instrument shown in FIG. 2 showing the cutting surface of the cutting tool positioned adjacent to the cannula opening.
- FIG. 6B is a cross sectional illustration of the surgical cutting tool of FIG. 6A showing the cutting surface of the cutting tool disposed remote from the opening near the cannula tip after excising a portion of the tissue extending into the cannula opening.
- FIG. 6C is a cross sectional illustration of the surgical cutting tool of FIG. 6A showing the cutting surface of the cutting tool trapping a portion of the tissue between the cutting tool and the opening near the tip of the cannula, which condition is avoided in accordance with the present invention.
- FIG. 7 is a cross sectional illustration of a further embodiment of a linearly reciprocating surgical cutting tool showing the cutting surface of the cutting tool trapping a portion of the tissue between the cutting tool and the opening near the tip of the cannula.
- FIG. 8 is an electrical schematic of a motor control circuit for use with one embodiment of the invention.
- System 10 includes a main control unit (MCU) 12 , which is preferably a microprocessor-based system.
- MCU 12 is operable to control the various operations of the surgical cutting instrument 26 as well as manage the overall operation of system 10 .
- a foot switch 14 which may be of known construction, is electrically connected to a number of inputs of MCU 12 via an equal number, K, of signal paths 16 , wherein K may be any integer.
- K may be any integer.
- foot switch 14 is operated by the surgeon to provide MCU 12 with control signals to signal activation and deactivation of the cutting instrument 26 as well as to control the cutting speed thereof.
- a control panel 18 which may be of known construction, is electrically connected to a number of inputs of MCU 12 via an equal number, J, of signal paths 20 , wherein J may be any integer.
- Control panel 18 may include a number of control mechanisms for controlling various features the cutting instrument or handpiece 26 . Examples of such features may include, but are not limited to, the flow of irrigation fluid (not shown) provided to the handpiece 26 , control of a vacuum source 42 connected to the handpiece 26 , and the like.
- a display unit 22 which may be of known construction, is electrically connected to a number of outputs of MCU 12 via an equal number, Q, of signal paths 24 , wherein Q may be any integer.
- Display unit 22 preferably includes provisions for displaying various operational parameters of system 10 including, but not limited to, operational status of the cutting instrument 26 , the speed of operation of the cutting tool 36 , vacuum level, and the like.
- a surgical cutting instrument 36 is disposed within a handpiece 26 and includes a brushed DC electrical motor 34 coupled to the cutting instrument or tool 36 via a motor drive shaft as will be described more fully hereinafter.
- the motor 34 is electrically connected to a motor control unit 28 via a number, M, of signal paths 30 wherein M may be any integer.
- the motor control unit 28 is, in turn, connected to a number of outputs of MCU 12 via an equal number, N, of signal paths 32 .
- a motor shaft position sensor 38 is electrically connected to a motor shaft position feedback input (SPF) of MCU 12 via signal path 40 , and provides a motor stop identification signal thereon as will be more fully described hereinafter.
- SPF motor shaft position feedback input
- the motor shaft stop identification signal provided by sensor 38 on signal path 40 preferably provides MCU 12 with a motor stop identification signal as well as a cutter speed signal that is proportional to the motor speed for a geared system or identical to the motor speed for a direct drive system.
- Handpiece 26 is further mechanically connected to a vacuum unit 42 via conduit 44 , whereby the vacuum unit 42 provides a controllable vacuum level to handpiece 26 for suctioning excised tissue as is known in the art.
- Vacuum unit 42 is electrically connected to a vacuum control unit 46 via a number, P, of signal paths wherein P may be any integer.
- the vacuum control unit 46 is, in turn, connected to a number of outputs of MCU 12 via an equal number, L, of signal paths 50 , wherein L may be any integer.
- a vacuum sensor 52 which may be a temperature compensated solid-state pressure sensor, is preferably positioned within the conduit 44 and is electrically connected to a vacuum feedback (VF) input of MCU 12 via signal path 54 .
- the vacuum sensor 52 may be disposed within handpiece 26 or within the vacuum unit 42 itself.
- the MCU 12 is responsive to a vacuum command signal, preferably provided by a corresponding control mechanism associated with control panel 18 or equivalent control mechanism, to provide one or more corresponding vacuum control signals to vacuum control unit 46 along signal paths 50 .
- the vacuum control unit 46 is responsive to the one or more vacuum control signals to activate the vacuum unit 42 to thereby provide handpiece 26 with a desired level of vacuum.
- the actual vacuum level provided to handpiece 26 is sensed by vacuum sensor 52 which provides a corresponding vacuum feedback signal to the vacuum feedback input VF of MCU 12 .
- the MCU 12 is then operable to compare the vacuum feedback signal with the vacuum command signal and correspondingly adjust the one or more vacuum control signals to achieve the desired vacuum level within handpiece 26 .
- Such closed-loop feedback techniques are well known in the control systems art.
- the MCU 12 can be replaced by individual microprocessors controlling the input and output for controlling the operation of the motor driver 58 and the vacuum generator unit 42 .
- the motor control and vacuum control microprocessors can be PIC16Cxx Series microcontrollers provided by Microchip, Inc. of Chandler Ariz.
- the motor control microcontrollers can receive input signals from the motor driver 58 and position sensor 38 , as well as the foot switch 14 and panel controls 18 .
- the vacuum microcontroller can receive input signals from the vacuum sensor 52 , the foot switch and panel controls.
- Each microcontroller can provide its own output to its driven component and have its own display, such as an LED display, indicative of its operational status.
- the two units can communicate with each other to ensure clean cutting by proper timing of the cutting and aspiration functions.
- the handpiece, or tissue cutting instrument, 26 includes a control portion 62 having an elongated housing or cannula 64 extending therefrom.
- the cannula 64 terminates at a cannula tip 66 and defines an opening 68 near the tip 66 .
- the cannula 64 is generally hollow and houses any of the various embodiments of the tissue cutting tool 36 as illustrated in FIGS. 4A, 5A, 6 A and 7 .
- cannula 64 is configured for insertion into a body site, and in one specific application of system 10 cannula 64 is configured to perform percutaneous ocular surgery.
- the connection of the vacuum unit 42 to cutting instrument 26 via conduit 44 is omitted in FIG.
- the motor control unit 28 in one embodiment includes a pulse width modulation (PWM) generator circuit 56 having a motor speed input connected to one of the MCU outputs 32 1 .
- the output 32 1 can provide a variable voltage signal indicative of a desired motor speed and based upon the position of a throttle or foot pedal.
- an additional input is connected to another one of the MCU outputs 32 2 .
- the signal at this output 32 2 can be a motor slowdown signal as described below.
- the output 32 2 can constitute a braking signal used in connection with a current feedback motor controller, as depicted in FIG. 8.
- the slowdown command may be communicated via the motor speed command itself, rather than through a separate signal 32 2 . In this instance, the output 32 2 may not be required.
- the PWM is disposed within the motor control unit.
- the PWM can be integrated into the MCU 12 , or into the separate motor control microprocessor discussed above.
- the motor speed input receives a motor speed signal from MCU 12 indicative of desired operational speed of the drive motor 34 .
- the slowdown input can receive a speed adjustment signal from the MCU 12 based on the actual motor speed signal provided by a motor sensor 76 associated with the drive motor 34 , which motor sensor 76 will be described in greater detail hereinafter.
- a motor driver circuit 58 is electrically connected to PWM generator circuit 56 via signal path 60 and receives a PWM drive signal therefrom, which is a pulse width modulated signal indicative of desired drive motor speed.
- the motor driver circuit 58 provides a motor drive signal (MD) to drive motor 34 via signal path 30 . While the preferred embodiment contemplates digital control of the motor using the PWM generator circuit 56 , alternative embodiments can utilize closed loop feedback analog circuits, particularly where slower cutting speeds are contemplated.
- One alternative controller is illustrated in FIG. 8 and described in more detail herein.
- the motor drive signal includes a motor stop input that is connected to another one of the MCU outputs 32 3 .
- MCU provides a motor stop signal on signal path 32 3 , based on a motor deactivation command provided by foot switch 14 and also based on a motor stop identification signal provided by sensor 38 , to stop the tissue cutting tool 36 in a desired position, as will be more fully described hereinafter.
- only the motor stop signal is utilized to command the motor to stop at the predetermined position.
- the motor slowdown signal on path 32 2 can be eliminated, or the input on path 32 2 can be used for other control signals to the motor control circuit.
- Drive motor 34 is preferably a known brushed DC electrical motor operable to drive a rotary motor shaft 70 connected thereto.
- the rotary motor shaft 70 is connected directly to a drive shaft 74 of a rotary cutting tool (see FIGS. 4 A- 4 D and 5 A- 5 D) disposed within the cannula 64 so that the cutting tool rotates about a longitudinal axis defined by the elongated cannula 64 .
- the rotary motor shaft 70 is connected to one end of a transmission mechanism 72 which is operable to convert the rotary motion of the shaft 70 to a linearly reciprocating motion.
- the opposite end of the transmission mechanism 72 is connected to the drive shaft 74 of a linearly reciprocating cutting tool (see FIGS. 6 A- 6 C, or 7 ) disposed within the cannula 64 so that the cutting tool reciprocates along the longitudinal axis of the cannula 64 .
- a linearly reciprocating cutting tool see FIGS. 6 A- 6 C, or 7
- An example of one known transmission mechanism for converting the rotary motion of shaft 70 to a linearly reciprocating motion is described in U.S. Pat. No. 5, 411,513 to Ireland et al., the disclosure of which is incorporated herein by reference.
- FIGS. 3A and 3B preferred embodiments of a mechanism for determining the motor stop identification signal are shown.
- sensor 38 is preferably disposed within, or attached to, an inner surface of handpiece 26 .
- a channel 25 is preferably formed within handpiece 26 and signal path 40 is disposed within channel 25 and electrically connected to sensor 38 .
- signal path 40 is isolated from the interior of handpiece 26 .
- Shaft 70 shown in FIG. 3A as rotatably driven in the direction indicated by arrow 75 , includes a shaft position identification mark 76 attached thereto or formed integral therewith.
- motor drive shaft 70 is connected to a transmission unit 72 which is then connected to the drive shaft 74 of a linearly reciprocating cutting instrument (see FIGS. 6A and 7), as shown in FIG. 3B, shaft 74 is linearly driven in the direction indicated by arrow 79 and includes a shaft position identification mark 77 attached thereto or formed integral therewith.
- mark 76 positioned on shaft 70 may be used even though handpiece 26 includes a transmission unit 72 .
- sensor 38 is preferably a known Hall effect sensor, although the present invention contemplates utilizing other known sensors such as a variable reluctance sensor and the like.
- Marks 76 and 77 are preferably magnetized identifiers that align with sensor 38 when the cutting instrument is in a preferred stop position.
- Sensor 38 is operable to sense passage thereby of mark 76 or 77 and provide corresponding shaft speed and motor stop identification signals to input shaft position feedback input SPF of MCU 12 via signal path 40 .
- FIGS. 4 A- 4 D one embodiment 80 of the tissue cutting tool 36 of FIG. 1 in relation to the cannula 64 is shown.
- the rotary tissue cutting tool 80 preferably includes a shaft 82 connected to, or integral with, the rotary drive shaft 70 of FIG. 2. Since cutting tool 80 is configured for rotary motion within cannula 64 , the transmission mechanism 72 is omitted and drive shafts 70 and 74 comprise a single drive shaft. Adjacent to the opening 68 formed near the tip 66 of cannula 64 , the cutting tool 80 defines a number of blades or fins 84 that act as cutting surfaces. A vacuum is established within the cannula 64 via vacuum unit 42 (FIG. 1) so that a suction force is developed at the cannula opening 68 in the direction indicated by arrow 85 .
- vacuum unit 42 FIG. 1
- the drive motor 34 is activated pursuant to a motor activation command, typically provided via foot switch 14 , wherein MCU 12 and motor control unit 28 are operable to process such a command as described hereinabove to cause motor 34 to rotate the one or more blades 84 in the direction indicated by arrow 86 .
- the suction developed at the opening 68 of the cannula draws nearby tissue T into the opening 68 when the one or more blades 84 are disposed remote from the opening 68 .
- a portion of the tissue ET extending into opening 68 is excised as shown in FIG. 4C.
- the excised tissue ET is drawn away from opening 68 via vacuum and is collected by a suitable tissue container (not shown).
- the brushed DC drive motor 34 is deactivated, and the one or more blades 84 correspondingly cease to rotate, pursuant to a motor stop command provided by foot switch 14 .
- the position of the rotary shaft 70 and hence the position of the one or more blades 84 relative to the cannula opening 68 , is appropriately controlled when the motor 34 is deactivated, one of the blades 84 may come to rest partially disposed over opening 68 and consequently trap a portion of the tissue T′ between the blade 84 and a boundary of the opening 68 as illustrated in FIG. 4D.
- Efforts at withdrawing the cannula 64 from the surgical site may accordingly result in tearing of the tissue portion T′ away from the tissue base T.
- the surgeon encountering such tissue trapping would typically be required to re-activate the cutting tool 80 to release the tissue portion T′ from its base T. In accordance with the present invention, however, such tissue trapping is avoided.
- FIGS. 5 A- 5 D another embodiment 90 of the tissue cutting tool 36 of FIG. 1 in relation to the cannula 64 is shown.
- the rotary tissue cutting tool 90 preferably includes an elongated hollow tube 92 connected to, or integral with, the rotary drive shaft 70 of FIG. 2. Since cutting tool 90 is configured for rotary motion within cannula 64 , the transmission mechanism 72 is omitted and drive shafts 70 and 74 comprise a single drive shaft. Adjacent to the opening 68 formed near the tip 66 of cannula 64 , the cutting tool 90 defines an opening 94 defining a cutting surface at its boundary. Vacuum is established within the cannula 64 via vacuum unit 42 (FIG. 1) so that a suction force is developed at the cannula opening 68 in the direction indicated by arrow 95 .
- vacuum unit 42 FIG. 1
- the drive motor 34 is activated as described above to cause motor 34 to rotate the cutting opening 94 defined within cutting tool 90 in the direction indicated by arrow 96 .
- the suction developed at the opening 68 of the cannula draws nearby tissue T into the opening 68 when the cutting tool opening 94 is aligned with the cannula opening 68 .
- a portion of the tissue ET extending into openings 68 and 94 is excised as shown in FIG. 5C.
- the excised tissue ET is drawn away from opening 68 via vacuum and is collected by a suitable tissue container (not shown).
- the cutting tool opening 94 may come to rest partially disposed over opening 68 and consequently trap a portion of the tissue T′ between a boundary of the cutting tool opening 94 and a boundary of the cannula opening 68 , as illustrated in FIG. 5D, unless the position of the rotary shaft 70 , and hence the position of the cutting tool opening 94 relative to the cannula opening 68 , is appropriately controlled when the motor 34 is deactivated.
- the linearly reciprocating tissue cutting tool 100 preferably includes an elongated hollow tube 102 connected to, or integral with, the drive shaft 74 of FIG. 2. Since cutting tool 100 is configured for linearly reciprocating motion within cannula 64 , the transmission mechanism 72 is operatively connected between drive shafts 70 and 74 . Adjacent to the opening 68 formed near the tip 66 of cann 1 aula 64 , the cutting tool 100 defines an opening 104 defining a cutting surface at its boundary. Vacuum is established within the cannula 64 via vacuum unit 42 (FIG. 1) so that a suction force is developed at the cannula opening 68 in the direction indicated by arrow 105 .
- the drive motor 34 operates as described to reciprocate the cutting opening 104 defined within cutting tool 100 linearly along the longitudinal axis of cannula 64 .
- the suction developed at the opening 68 of the cannula draws nearby tissue T into the opening 68 when the cutting tool opening 104 is aligned with the cannula opening 68 .
- As the cutting tool opening 94 pulls away from the cannula opening 68 a portion of the tissue ET extending into openings 68 and 104 is excised as shown in FIG. 5B.
- the excised tissue ET is drawn away from opening 68 via vacuum and is collected by a suitable tissue container (not shown).
- the cutting tool opening 104 may come to rest partially disposed over opening 68 and consequently trap a portion of the tissue T′ between a boundary of the cutting tool opening 104 and a boundary of the cannula opening 68 , as illustrated in FIG. 6C, unless the position of the rotary shaft 70 , and hence the position of the cutting tool opening 104 relative to the cannula opening 68 , is appropriately controlled when the motor 34 is deactivated.
- the reciprocating cutting instrument shown in FIGS. 6 A-C can be modified to an end cutting configuration, such as depicted in FIG. 7.
- the cutting tool 106 is open at its distal end.
- the distal end 108 defines a circumferential cutting surface that excises the tissue T.
- the cutting tool 106 can be stopped in a position in which a portion of the tissue is trapped between the cutting opening in the outer cannula and the cutting surface 108 , leading to the phenomena described above.
- the motor control system according to the illustrated embodiments of the present invention can adjust the stopped position of the cutting tool 106 so the end cutting surface 108 is clear of the cannula cutting opening.
- the tissue trapping conditions illustrated in FIGS. 4D, 5D, 6 C and 7 are avoided by controlling deactivation of the drive motor 34 in such a manner that the cutting surface(s) of the various cutting tools are positioned remote from the cannula opening 68 .
- controlled deactivation of the drive motor 34 will now be described in detail.
- a motor stop command is provided via foot switch 14 (FIG. 1).
- MCU 12 is responsive to the motor stop command to provide a slowdown signal to the PWM generator via signal path 322 which slows the action of motor 34 .
- the slowdown signal corresponds to a predefined signal level operable to drive the motor 34 at a motor speed below a motor speed threshold level. Since motor 34 is a brushed DC motor, it has a rotational resistance or resistive torque associated therewith as described above.
- alignment of mark 76 or 77 with sensor 38 preferably corresponds to a position of the cutting instrument at which there is no danger of trapping tissue between a cutting surface thereof and the cannula opening, and sensor 38 is operable to produce the motor stop identification signal when so aligned with mark 76 or 77 .
- mark 76 or 77 is preferably at the open position, it may be located at any known displacement from the open position, so long as sufficient delay is controllably introduced in the activation of the brake signal. This delay can compensate for the displacement of the alignment mark 76 or 77 .
- MCU 12 is preferably operable to produce a motor stop signal on signal path 323 when sensor 38 detects alignment of mark 76 or 77 therewith after one passage thereby of mark 76 or 77 since producing the slowdown signal on signal path 322 . Allowing one passage of mark 76 or 77 by sensor 38 after issuing the slowdown signal ensures that the drive speed of motor 34 is at or below the motor speed threshold when subsequently issuing the motor stop command, regardless of the position of mark 76 or 77 relative to sensor 38 when the slowdown command was issued.
- MCU 12 is responsive to the signal provided by sensor 38 indicative of alignment of mark 76 or 77 therewith, to produce the motor stop signal on signal path 323 .
- the motor driver 58 is responsive to the motor stop signal to produce a motor disable signal on signal path 30 .
- motor 34 is responsive to the motor disable signal to immediately cease operation thereof with mark 76 or 77 substantially aligned with sensor 38 , and with the cutting instrument accordingly positioned so as not to trap tissue between any cutting surface thereof and the cannula opening.
- the stopped position of the motor, and therefore the cutting surface may be instead aligned with a predetermined differential distance between the mark 76 / 77 and the sensor 38 .
- the braking characteristics of the cutter and its motor can be ascertained and the stopping distance determined so that this predetermined differential distance can be calibrated accordingly.
- MCU 12 is preferably operable to stop the drive motor 34 as just described with the cutting blades 84 positioned as illustrated in FIG. 4B, although the present invention contemplates stopping the drive motor 34 with cutting blades 84 positioned otherwise relative to cannula opening 68 so long as tissue pinching does not occur as illustrated in FIG. 4D.
- MCU 12 is preferably operable to stop the drive motor 34 as just described with the cutting opening 94 positioned as illustrated in FIG. 5C, although the present invention contemplates stopping the drive motor 34 with cutting opening 94 positioned otherwise relative to cannula opening 68 so long as tissue pinching does not occur as illustrated in FIG. 5D.
- MCU 12 is preferably operable to stop the drive motor 34 as just described with the cutting opening 104 positioned as illustrated in FIG. 6B, although the present invention contemplates stopping the drive motor 34 with cutting opening 104 positioned otherwise relative to cannula opening 68 so long as tissue pinching does not occur as illustrated in FIG. 6C.
- the actual motor speed will be below the motor speed threshold when the motor stop command is issued by the surgeon.
- the MCU can be programmed to recognize this condition and bypass the requirement of one passage of the mark 76 or 77 past the sensor. If the motor speed is already sufficiently slow, the MCU can simply disable the motor when the mark first encounters the sensor.
- the motor disable signal can be provided to a relay spanning the motor terminals, such as relay 110 shown in phantom within the handpiece depicted in FIG. 2. Energizing the relay shorts across the terminals to immediately “kill” the motor.
- This motor short approach adds to the rotational resistance described above to ensure that the motor can be stopped repeatably and reliably.
- the shorting relay serves as a sort of fail-safe feature that prevents the possibility that motor can become re-energized while the cutting instrument is being removed from the patient.
- the motor slowdown signal can be eliminated, but the motor speed signal set to a speed of zero, which effectively results in shorting of the drive outputs. This action is equivalent to activating the relay 110 , with the same improvements in stopping time.
- the motor slowdown signal is eliminated.
- the rotational resistance or natural braking characteristics of the motor and cutter can be quantified to determine how far the motor will rotate once current is terminated to the motor.
- Current can be supplied to the motor even after a motor stop signal has been received, until the motor control circuit receives a motor stop identification signal generated by the sensor 38 .
- the sensor 38 can be placed offset from the predetermined position at which cutting surface is clear of the cannula cutting opening. Thus, when the signal from sensor 38 is received, current to the motor can be terminated and the motor will coast to a stop at the appropriate position.
- the motor control circuit implements pulse width modulation to control the motor speed and operation.
- a control circuit shown in FIG. 8 relies upon current feedback to control the motor speed.
- the control circuit 110 includes a current sensor 112 and a power amplifier circuit 112 .
- the motor drive signal 116 is provided at the output of the power amplifier circuit 112 .
- a speed control signal 118 is supplied as an input to the amplifier 114 circuit based upon a throttle position.
- the speed control signal 118 can be supplied at the signal path 32 (FIG. 1).
- Current to the motor drive signal 116 is delivered through the resistor 122 .
- the output of the power amplifier circuit 112 is fed directly and through resistor 122 to a difference amplifier 124 in the current sensor 114 .
- the output 126 of the difference amplifier is provided as a feedback signal to an input of the power amplifier circuit 112 .
- the amplifier circuit includes an op amp 128 that receives the feedback output 126 and the signal input 118 conditioned through a resistor 130 .
- a resistor 134 scales and amplifies the input signals to supply the current signal to the motor drive signal 116 .
- a feedback disable switch 136 is interposed between the feedback output 126 and the input to the power amplifier circuit 112 .
- a braking signal 120 is supplied to the switch 136 to determine its state.
- the switch 136 connects the feedback output 126 to the power amplifier circuit input.
- the switch 136 connects the feedback output 126 to ground, thereby disabling the current feedback control feature of the drive circuit 110 .
- the absence of the current feedback increases the natural braking characteristics of the handpiece and drive motor.
- the braking signal input 120 can be derived from the motor stop signal 32 3 identified in FIG. 2. Alternatively, the braking signal input 120 can be connected to the output 32 2 , which had been used for a slowdown signal with the motor control circuit shown in FIG. 2. As with the prior embodiments, the motor control circuit 110 relies upon the natural rotational resistance and braking characteristics of the motor and cutter. These characteristics are particularly pronounced for a brushed DC motor and can be readily quantified.
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Abstract
Description
- The present invention relates generally to systems for controlling motor driven surgical cutting instruments, and more specifically to such systems for controlling the position of the surgical cutting instrument upon stoppage of the drive motor. More particularly, the invention relates to controlling a brush type DC motor used to drive the cutting instrument.
- Minimally invasive surgical cutting instruments are known and widely used to excise and remove biological tissue. Such instruments typically include a handpiece comprising a cutting tool housed within an elongated cannula, wherein the tool is disposed adjacent to an opening at or near the tip of the cannula. The cannula itself is configured for percutaneous insertion into a body via a small incision, and is manually maneuvered into position for tissue excision and removal.
- Various configurations of cutting tools are known and may be driven manually, pneumatically or via an electrically controlled drive motor. In any case, tissue adjacent to the opening near the tip of the cannula is typically excised by driving the cutting tool with either a rotary or reciprocal motion relative to the cannula, whereby tissue is drawn into the opening (typically via vacuum) and excised by the cutting tool.
- While motor driven surgical cutting instruments of the type just described have been widely used in surgical applications, many presently available designs suffer from a variety of drawbacks. For example, if the position of the cutting tool is not controlled when the drive motor is disabled, there exists a possibility that the cutting tool may come to rest in a position that traps or pinches unexcised tissue between a cutting surface of the cutting tool and the opening near the tip of the cannula. To avoid this problem, surgeons must typically maintain activation of the drive motor as the tip of the instrument is moved or removed from the surgical site, thereby compromising the accuracy and precision of the procedure. The foregoing drawback becomes more problematic as the complexity of the procedure increases, and is of particular concern when performing delicate procedures such as removing vitreous tissue during ocular surgery.
- Designers of such surgical cutting instruments have attempted to address the foregoing problem by providing various systems for controlling motor position when stopping or disabling the drive motor. An example of one such system for controlling the position of a three-phase brushless DC motor is given in U.S. Pat. No. 5,602,449 to Krause, et al. The Krause et al. disclosure discloses an elaborate control system including multiple sensors for determining motor armature position at 6° intervals. As is known in the art, brushless DC motors are typically speed driven rather than torque driven and accordingly have little rotational resistance associated with the operation thereof. Controlled stoppage of such a motor is thus extremely difficult, if not impossible, when the motor is operating at a high rotational speed, and the Krause et al. system is accordingly responsive to a motor stop signal to first decrease motor speed below some threshold speed level and then perform a controlled stop based on armature position.
- Brushed DC motors, as compared with brushless DC motors, are typically torque driven rather than speed driven, and accordingly have a substantial rotational resistance associated therewith. Thus, while the Krause et al. system may effectively provide for controlled stopping of a surgical cutting instrument driven by a brushless DC motor, such elaborate control techniques are unnecessary when driving a brushed DC motor. What is therefore needed is a simple and inexpensive control technique for controlling the stop position of a brushed DC motor driven surgical instrument. Ideally the control system should be operable to control the position of the cutting tool when the drive motor is turned off so that unexcised tissue is not trapped between the cutting tool and the opening near the tip of the cannula.
- The foregoing shortcomings of the prior art are addressed by the present invention. In accordance with one aspect of the present invention, a tissue cutting apparatus comprises an elongated housing configured for insertion into a body site, the housing having a first end defining an opening adjacent thereto. A tissue cutting tool is disposed within the housing and defines at least one cutting surface configured for movement relative to the housing adjacent the opening to thereby excise tissue extending into the opening.
- In one feature of the invention, a brushed DC motor drives a drive shaft coupled to the cutting tool. While the brushed motor is rotary, the cutting tool can be driven in a rotary or reciprocating fashion with an appropriate transmission mechanism between the drive shaft and cutting tool. Means are provided for sensing a predefined position of the drive shaft relative to the housing and producing a stop position signal corresponding thereto. In one embodiment, the sensing means is a Hall effect sensor and magnet arranged between the motor and the cutting tool.
- A motor control circuit is provided to control operation of the motor. In one embodiment, the circuit includes a pulse-width-modulated controller. In another embodiment, the motor control circuit utilizes a current feedback to control the motor current. With either embodiment, the motor control circuit is operable in response to a motor stop signal to stop the motor with the drive shaft at the predefined position. Certain features of the motor control circuit are configured to take advantage of the natural braking characteristics of the motor and cutting tool in order to stop the motor at the appropriate position. This predefined position is arranged to orient the cutting surface of the cutting tool relative to the opening to avoid trapping unexcised tissue between the cutting surface and a boundary of the opening.
- In one embodiment of the invention, the motor control circuit includes an op amp driven current feedback loop to control the current provided to the brushed motor. A switch is interposed in the feedback loop to disable the current feedback signal when it is desired to stop the motor. Eliminating the current feedback improves the braking characteristics of the motor and handpiece so that the cutting blade can be accurately stopped in its predetermined position. With this embodiment, the control circuit can respond to a motor stop signal to activate the feedback loop switch. The motor is powered until the stop position signal is received indicating that the drive shaft is at the predetermined position, at which point current to the motor is ceased to stop the cutter.
- In another embodiment, the control circuit is responsive to a motor stop signal to drive the motor at a predefined motor speed less than the cutter operating speed. The control circuit is also responsive to a second occurrence of the stop position signal to deactivate the motor with the drive shaft at the predefined position.
- One object of the present invention is to provide an improved surgical cutting apparatus that is operable to avoid trapping unexcised tissue between the cutting tool and a boundary of the opening in the cannula when the cutting tool drive motor is deactivated.
- Another object of the present invention is to provide such improvements to surgical cutting apparatuses that have either a rotating cutting tool or a linearly reciprocating cutting tool.
- These and other objects of the present invention will become more apparent from the following description of the preferred embodiment.
- FIG. 1 is a diagrammatic illustration of one embodiment of a system for controlling the brushed DC motor of a motor driven surgical instrument, in accordance with the present invention.
- FIG. 2 is a diagrammatic illustration of the system of FIG. 1 showing further details of one embodiment of a motor control unit and the surgical instrument.
- FIG. 3A is a cross sectional illustration of the handpiece of FIG. 2 showing details of a surgical instrument stop position identification mechanism for a rotationally driven motor shaft.
- FIG. 3B is a cross sectional illustration of the handpiece of FIG. 2 showing details of a surgical instrument stop position identification mechanism for a linearly driven motor shaft.
- FIG. 4A is a cross sectional illustration of one embodiment of a rotary surgical cutting tool disposed within the cannula of the surgical instrument shown in FIG. 2.
- FIG. 4B is a cross sectional illustration of the surgical cutting tool of FIG. 4A, viewed along
section lines 4B-4B, showing the cutting surfaces of the cutting tool positioned remote from the cannula opening. - FIG. 4C is a cross sectional illustration of the surgical cutting tool of FIG. 4A, viewed along section lines4C-4C, showing one of the cutting surfaces of the cutting tool excising a portion of the tissue forced into the opening near the cannula tip.
- FIG. 4D is a cross sectional illustration of the surgical cutting tool of FIG. 4A, viewed along section lines4D-4D, showing one of the cutting surfaces of the cutting tool trapping a portion of the tissue between the cutting tool and the opening near the tip of the cannula, which condition is avoided in accordance with the present invention.
- FIG. 5A is a cross sectional illustration of another embodiment of a rotary surgical cutting tool disposed within the cannula of the surgical instrument shown in FIG. 2.
- FIG. 5B is a cross sectional illustration of the surgical cutting tool of FIG. 5A, viewed along
section lines 5B-5B, showing the cutting surface of the cutting tool positioned adjacent to the cannula opening. - FIG. 5C is a cross sectional illustration of the surgical cutting tool of FIG. 5A, viewed along section lines5C-5C, showing the cutting surface of the cutting tool disposed remote from the opening near the cannula tip after excising a portion of the tissue extending into the cannula opening.
- FIG. 5D is a cross sectional illustration of the surgical cutting tool of FIG. 5A, viewed along section lines5D-5D, showing the cutting surface of the cutting tool trapping a portion of the tissue between the cutting tool and the opening near the tip of the cannula, which condition is avoided in accordance with the present invention.
- FIG. 6A is a cross sectional illustration of one embodiment of a linearly reciprocating surgical cutting tool disposed within the cannula of the surgical instrument shown in FIG. 2 showing the cutting surface of the cutting tool positioned adjacent to the cannula opening.
- FIG. 6B is a cross sectional illustration of the surgical cutting tool of FIG. 6A showing the cutting surface of the cutting tool disposed remote from the opening near the cannula tip after excising a portion of the tissue extending into the cannula opening.
- FIG. 6C is a cross sectional illustration of the surgical cutting tool of FIG. 6A showing the cutting surface of the cutting tool trapping a portion of the tissue between the cutting tool and the opening near the tip of the cannula, which condition is avoided in accordance with the present invention.
- FIG. 7 is a cross sectional illustration of a further embodiment of a linearly reciprocating surgical cutting tool showing the cutting surface of the cutting tool trapping a portion of the tissue between the cutting tool and the opening near the tip of the cannula.
- FIG. 8 is an electrical schematic of a motor control circuit for use with one embodiment of the invention.
- For the purposes of promoting an understanding of the principles of the invention, reference will now be made to the embodiments illustrated in the drawings and specific language will be used to describe the same. It will nevertheless be understood that no limitation of the scope of the invention is thereby intended, such alterations and further modifications in the illustrated devices, and such further applications of the principles of the invention as illustrated therein being contemplated as would normally occur to one skilled in the art to which the invention relates.
- Referring to FIG. 1, one preferred embodiment of a
system 10 for controlling a motor driven surgical cutting instrument, in accordance with the present invention, is shown.System 10 includes a main control unit (MCU) 12, which is preferably a microprocessor-based system.MCU 12, as it relates to the present invention, is operable to control the various operations of thesurgical cutting instrument 26 as well as manage the overall operation ofsystem 10. Afoot switch 14, which may be of known construction, is electrically connected to a number of inputs ofMCU 12 via an equal number, K, ofsignal paths 16, wherein K may be any integer. As is known in the art,foot switch 14 is operated by the surgeon to provideMCU 12 with control signals to signal activation and deactivation of the cuttinginstrument 26 as well as to control the cutting speed thereof. - A
control panel 18, which may be of known construction, is electrically connected to a number of inputs ofMCU 12 via an equal number, J, ofsignal paths 20, wherein J may be any integer.Control panel 18 may include a number of control mechanisms for controlling various features the cutting instrument orhandpiece 26. Examples of such features may include, but are not limited to, the flow of irrigation fluid (not shown) provided to thehandpiece 26, control of avacuum source 42 connected to thehandpiece 26, and the like. - A
display unit 22, which may be of known construction, is electrically connected to a number of outputs ofMCU 12 via an equal number, Q, ofsignal paths 24, wherein Q may be any integer.Display unit 22 preferably includes provisions for displaying various operational parameters ofsystem 10 including, but not limited to, operational status of the cuttinginstrument 26, the speed of operation of thecutting tool 36, vacuum level, and the like. - A
surgical cutting instrument 36 is disposed within ahandpiece 26 and includes a brushed DCelectrical motor 34 coupled to the cutting instrument ortool 36 via a motor drive shaft as will be described more fully hereinafter. Themotor 34 is electrically connected to amotor control unit 28 via a number, M, ofsignal paths 30 wherein M may be any integer. Themotor control unit 28 is, in turn, connected to a number of outputs ofMCU 12 via an equal number, N, ofsignal paths 32. A motorshaft position sensor 38 is electrically connected to a motor shaft position feedback input (SPF) ofMCU 12 viasignal path 40, and provides a motor stop identification signal thereon as will be more fully described hereinafter. As it relates to the present invention, the motor shaft stop identification signal provided bysensor 38 onsignal path 40 preferably providesMCU 12 with a motor stop identification signal as well as a cutter speed signal that is proportional to the motor speed for a geared system or identical to the motor speed for a direct drive system. -
Handpiece 26 is further mechanically connected to avacuum unit 42 viaconduit 44, whereby thevacuum unit 42 provides a controllable vacuum level to handpiece 26 for suctioning excised tissue as is known in the art.Vacuum unit 42 is electrically connected to avacuum control unit 46 via a number, P, of signal paths wherein P may be any integer. Thevacuum control unit 46 is, in turn, connected to a number of outputs ofMCU 12 via an equal number, L, ofsignal paths 50, wherein L may be any integer. Avacuum sensor 52, which may be a temperature compensated solid-state pressure sensor, is preferably positioned within theconduit 44 and is electrically connected to a vacuum feedback (VF) input ofMCU 12 viasignal path 54. Alternatively, thevacuum sensor 52 may be disposed withinhandpiece 26 or within thevacuum unit 42 itself. - In operation, the
MCU 12 is responsive to a vacuum command signal, preferably provided by a corresponding control mechanism associated withcontrol panel 18 or equivalent control mechanism, to provide one or more corresponding vacuum control signals tovacuum control unit 46 alongsignal paths 50. Thevacuum control unit 46, in turn, is responsive to the one or more vacuum control signals to activate thevacuum unit 42 to thereby providehandpiece 26 with a desired level of vacuum. The actual vacuum level provided tohandpiece 26 is sensed byvacuum sensor 52 which provides a corresponding vacuum feedback signal to the vacuum feedback input VF ofMCU 12. TheMCU 12 is then operable to compare the vacuum feedback signal with the vacuum command signal and correspondingly adjust the one or more vacuum control signals to achieve the desired vacuum level withinhandpiece 26. Such closed-loop feedback techniques are well known in the control systems art. - In one alternative embodiment, the
MCU 12 can be replaced by individual microprocessors controlling the input and output for controlling the operation of themotor driver 58 and thevacuum generator unit 42. In this alternative embodiment, the motor control and vacuum control microprocessors can be PIC16Cxx Series microcontrollers provided by Microchip, Inc. of Chandler Ariz. The motor control microcontrollers can receive input signals from themotor driver 58 andposition sensor 38, as well as thefoot switch 14 and panel controls 18. Likewise, the vacuum microcontroller can receive input signals from thevacuum sensor 52, the foot switch and panel controls. Each microcontroller can provide its own output to its driven component and have its own display, such as an LED display, indicative of its operational status. Moreover, the two units can communicate with each other to ensure clean cutting by proper timing of the cutting and aspiration functions. - In one preferred embodiment, the handpiece, or tissue cutting instrument,26 includes a
control portion 62 having an elongated housing orcannula 64 extending therefrom. Thecannula 64 terminates at acannula tip 66 and defines anopening 68 near thetip 66. Thecannula 64 is generally hollow and houses any of the various embodiments of thetissue cutting tool 36 as illustrated in FIGS. 4A, 5A, 6A and 7. In any case,cannula 64 is configured for insertion into a body site, and in one specific application ofsystem 10cannula 64 is configured to perform percutaneous ocular surgery. The connection of thevacuum unit 42 to cuttinginstrument 26 viaconduit 44 is omitted in FIG. 2 for brevity and clarity of illustration of the brushedDC drive motor 34 and related components. It is to be understood, however, that such a vacuum connection is made toinstrument 26 and is typically made betweencannula 64 andcontrol section 62. Moreover, although not specifically shown in the drawings, an irrigation fluid connection may also be made to cuttinginstrument 26 so that irrigation fluid may be passed to the surgical site viacannula opening 68. - Referring now to FIGS. 2 and 3A, preferred embodiments of the
motor control unit 28 andhandpiece 26 are shown in greater detail. Themotor control unit 28 in one embodiment includes a pulse width modulation (PWM)generator circuit 56 having a motor speed input connected to one of the MCU outputs 32 1. Theoutput 32 1 can provide a variable voltage signal indicative of a desired motor speed and based upon the position of a throttle or foot pedal. In certain embodiments, an additional input is connected to another one of the MCU outputs 32 2. The signal at thisoutput 32 2 can be a motor slowdown signal as described below. Alternatively, theoutput 32 2 can constitute a braking signal used in connection with a current feedback motor controller, as depicted in FIG. 8. As a further alternative, the slowdown command may be communicated via the motor speed command itself, rather than through aseparate signal 32 2. In this instance, theoutput 32 2 may not be required. - In the illustrated embodiment, the PWM is disposed within the motor control unit. Alternatively, the PWM can be integrated into the
MCU 12, or into the separate motor control microprocessor discussed above. The motor speed input receives a motor speed signal fromMCU 12 indicative of desired operational speed of thedrive motor 34. The slowdown input can receive a speed adjustment signal from theMCU 12 based on the actual motor speed signal provided by amotor sensor 76 associated with thedrive motor 34, whichmotor sensor 76 will be described in greater detail hereinafter. - A
motor driver circuit 58 is electrically connected toPWM generator circuit 56 viasignal path 60 and receives a PWM drive signal therefrom, which is a pulse width modulated signal indicative of desired drive motor speed. Themotor driver circuit 58 provides a motor drive signal (MD) to drivemotor 34 viasignal path 30. While the preferred embodiment contemplates digital control of the motor using thePWM generator circuit 56, alternative embodiments can utilize closed loop feedback analog circuits, particularly where slower cutting speeds are contemplated. One alternative controller is illustrated in FIG. 8 and described in more detail herein. - The motor drive signal includes a motor stop input that is connected to another one of the MCU outputs32 3. In accordance with the present invention, MCU provides a motor stop signal on
signal path 32 3, based on a motor deactivation command provided byfoot switch 14 and also based on a motor stop identification signal provided bysensor 38, to stop thetissue cutting tool 36 in a desired position, as will be more fully described hereinafter. In certain embodiments, only the motor stop signal is utilized to command the motor to stop at the predetermined position. In these certain embodiments, the motor slowdown signal onpath 32 2 can be eliminated, or the input onpath 32 2 can be used for other control signals to the motor control circuit. -
Drive motor 34 is preferably a known brushed DC electrical motor operable to drive arotary motor shaft 70 connected thereto. In one embodiment of the present invention, therotary motor shaft 70 is connected directly to adrive shaft 74 of a rotary cutting tool (see FIGS. 4A-4D and 5A-5D) disposed within thecannula 64 so that the cutting tool rotates about a longitudinal axis defined by theelongated cannula 64. In an alternative embodiment, therotary motor shaft 70 is connected to one end of atransmission mechanism 72 which is operable to convert the rotary motion of theshaft 70 to a linearly reciprocating motion. The opposite end of thetransmission mechanism 72 is connected to thedrive shaft 74 of a linearly reciprocating cutting tool (see FIGS. 6A-6C, or 7) disposed within thecannula 64 so that the cutting tool reciprocates along the longitudinal axis of thecannula 64. An example of one known transmission mechanism for converting the rotary motion ofshaft 70 to a linearly reciprocating motion is described in U.S. Pat. No. 5, 411,513 to Ireland et al., the disclosure of which is incorporated herein by reference. - Referring now to FIGS. 3A and 3B, preferred embodiments of a mechanism for determining the motor stop identification signal are shown. In the case that
motor drive shaft 70 is connected directly to thedrive shaft 74 of a rotary cutting instrument (FIGS. 4A and 5A), as shown in FIG. 3A,sensor 38 is preferably disposed within, or attached to, an inner surface ofhandpiece 26. Achannel 25 is preferably formed withinhandpiece 26 andsignal path 40 is disposed withinchannel 25 and electrically connected tosensor 38. In this manner, signalpath 40 is isolated from the interior ofhandpiece 26.Shaft 70, shown in FIG. 3A as rotatably driven in the direction indicated byarrow 75, includes a shaftposition identification mark 76 attached thereto or formed integral therewith. In the case thatmotor drive shaft 70 is connected to atransmission unit 72 which is then connected to thedrive shaft 74 of a linearly reciprocating cutting instrument (see FIGS. 6A and 7), as shown in FIG. 3B,shaft 74 is linearly driven in the direction indicated byarrow 79 and includes a shaftposition identification mark 77 attached thereto or formed integral therewith. Alternatively, mark 76 positioned onshaft 70 may be used even thoughhandpiece 26 includes atransmission unit 72. In any case,sensor 38 is preferably a known Hall effect sensor, although the present invention contemplates utilizing other known sensors such as a variable reluctance sensor and the like.Marks sensor 38 when the cutting instrument is in a preferred stop position.Sensor 38 is operable to sense passage thereby ofmark MCU 12 viasignal path 40. - Referring now to FIGS.4A-4D, one
embodiment 80 of thetissue cutting tool 36 of FIG. 1 in relation to thecannula 64 is shown. The rotarytissue cutting tool 80, as shown in FIG. 4A, preferably includes ashaft 82 connected to, or integral with, therotary drive shaft 70 of FIG. 2. Since cuttingtool 80 is configured for rotary motion withincannula 64, thetransmission mechanism 72 is omitted and driveshafts opening 68 formed near thetip 66 ofcannula 64, the cuttingtool 80 defines a number of blades orfins 84 that act as cutting surfaces. A vacuum is established within thecannula 64 via vacuum unit 42 (FIG. 1) so that a suction force is developed at thecannula opening 68 in the direction indicated byarrow 85. - Referring to FIG. 4B, the
drive motor 34 is activated pursuant to a motor activation command, typically provided viafoot switch 14, whereinMCU 12 andmotor control unit 28 are operable to process such a command as described hereinabove to causemotor 34 to rotate the one ormore blades 84 in the direction indicated byarrow 86. The suction developed at theopening 68 of the cannula draws nearby tissue T into theopening 68 when the one ormore blades 84 are disposed remote from theopening 68. As the one ormore blades 84 rotate adjacent to thecannula opening 68, a portion of the tissue ET extending intoopening 68 is excised as shown in FIG. 4C. The excised tissue ET is drawn away from opening 68 via vacuum and is collected by a suitable tissue container (not shown). - The brushed
DC drive motor 34 is deactivated, and the one ormore blades 84 correspondingly cease to rotate, pursuant to a motor stop command provided byfoot switch 14. However, unless the position of therotary shaft 70, and hence the position of the one ormore blades 84 relative to thecannula opening 68, is appropriately controlled when themotor 34 is deactivated, one of theblades 84 may come to rest partially disposed overopening 68 and consequently trap a portion of the tissue T′ between theblade 84 and a boundary of theopening 68 as illustrated in FIG. 4D. Efforts at withdrawing thecannula 64 from the surgical site may accordingly result in tearing of the tissue portion T′ away from the tissue base T. Heretofore, the surgeon encountering such tissue trapping would typically be required to re-activate thecutting tool 80 to release the tissue portion T′ from its base T. In accordance with the present invention, however, such tissue trapping is avoided. - Referring now to FIGS.5A-5D, another
embodiment 90 of thetissue cutting tool 36 of FIG. 1 in relation to thecannula 64 is shown. The rotarytissue cutting tool 90, as shown in FIG. 5A, preferably includes an elongatedhollow tube 92 connected to, or integral with, therotary drive shaft 70 of FIG. 2. Since cuttingtool 90 is configured for rotary motion withincannula 64, thetransmission mechanism 72 is omitted and driveshafts opening 68 formed near thetip 66 ofcannula 64, the cuttingtool 90 defines anopening 94 defining a cutting surface at its boundary. Vacuum is established within thecannula 64 via vacuum unit 42 (FIG. 1) so that a suction force is developed at thecannula opening 68 in the direction indicated byarrow 95. - Referring to FIG. 5B, the
drive motor 34 is activated as described above to causemotor 34 to rotate the cuttingopening 94 defined within cuttingtool 90 in the direction indicated byarrow 96. The suction developed at theopening 68 of the cannula draws nearby tissue T into theopening 68 when the cutting tool opening 94 is aligned with thecannula opening 68. As the cutting tool opening 94 rotates away from thecannula opening 68, a portion of the tissue ET extending intoopenings - As with the embodiment illustrated in FIGS.4A-4D, the cutting tool opening 94 may come to rest partially disposed over
opening 68 and consequently trap a portion of the tissue T′ between a boundary of thecutting tool opening 94 and a boundary of thecannula opening 68, as illustrated in FIG. 5D, unless the position of therotary shaft 70, and hence the position of the cutting tool opening 94 relative to thecannula opening 68, is appropriately controlled when themotor 34 is deactivated. Again, efforts at withdrawing thecannula 64 from the surgical site may accordingly result in tearing of the tissue portion T′ away from the tissue base T, and a surgeon encountering such tissue trapping would typically be required to re-activate thecutting tool 90 to release the tissue portion T′ from its base T. - Referring now to FIGS.6A-6C, yet another
embodiment 100 of thetissue cutting tool 36 of FIG. 1 in relation to thecannula 64 is shown. The linearly reciprocatingtissue cutting tool 100 preferably includes an elongatedhollow tube 102 connected to, or integral with, thedrive shaft 74 of FIG. 2. Since cuttingtool 100 is configured for linearly reciprocating motion withincannula 64, thetransmission mechanism 72 is operatively connected betweendrive shafts opening 68 formed near thetip 66 ofcann1aula 64, thecutting tool 100 defines anopening 104 defining a cutting surface at its boundary. Vacuum is established within thecannula 64 via vacuum unit 42 (FIG. 1) so that a suction force is developed at thecannula opening 68 in the direction indicated byarrow 105. - The
drive motor 34 operates as described to reciprocate thecutting opening 104 defined within cuttingtool 100 linearly along the longitudinal axis ofcannula 64. The suction developed at theopening 68 of the cannula draws nearby tissue T into theopening 68 when thecutting tool opening 104 is aligned with thecannula opening 68. As the cutting tool opening 94 pulls away from thecannula opening 68, a portion of the tissue ET extending intoopenings - As with the embodiments illustrated in FIGS.4A-4D and 5A-5D, the cutting tool opening 104 may come to rest partially disposed over
opening 68 and consequently trap a portion of the tissue T′ between a boundary of thecutting tool opening 104 and a boundary of thecannula opening 68, as illustrated in FIG. 6C, unless the position of therotary shaft 70, and hence the position of the cutting tool opening 104 relative to thecannula opening 68, is appropriately controlled when themotor 34 is deactivated. Again, efforts at withdrawing thecannula 64 from the surgical site may accordingly result in tearing of the tissue portion T′ away from the tissue base T, and a surgeon encountering such tissue trapping would typically be required to re-activate thecutting tool 100 to release the tissue portion T′ from its base T. - The reciprocating cutting instrument shown in FIGS.6A-C can be modified to an end cutting configuration, such as depicted in FIG. 7. In this configuration, the
cutting tool 106 is open at its distal end. Thedistal end 108 defines a circumferential cutting surface that excises the tissue T. As shown in FIG. 7, thecutting tool 106 can be stopped in a position in which a portion of the tissue is trapped between the cutting opening in the outer cannula and the cuttingsurface 108, leading to the phenomena described above. The motor control system according to the illustrated embodiments of the present invention can adjust the stopped position of thecutting tool 106 so theend cutting surface 108 is clear of the cannula cutting opening. - In accordance with the present invention, the tissue trapping conditions illustrated in FIGS. 4D, 5D,6C and 7 are avoided by controlling deactivation of the
drive motor 34 in such a manner that the cutting surface(s) of the various cutting tools are positioned remote from thecannula opening 68. Referring again to FIGS. 2, 3A and 3B, controlled deactivation of thedrive motor 34 will now be described in detail. - When it is desired to deactivate a presently activated cutting tool, such as any of the cutting tools illustrated in FIGS.4A-4D, 5A-5D, 6A-6C or 7, a motor stop command is provided via foot switch 14 (FIG. 1). In one embodiment,
MCU 12 is responsive to the motor stop command to provide a slowdown signal to the PWM generator viasignal path 322 which slows the action ofmotor 34. Preferably, the slowdown signal corresponds to a predefined signal level operable to drive themotor 34 at a motor speed below a motor speed threshold level. Sincemotor 34 is a brushed DC motor, it has a rotational resistance or resistive torque associated therewith as described above. In addition, in some cases friction between the inner and outer needles will increase the rotational resistance. Due to this combined rotational resistance, operation of themotor 34 will cease very rapidly or nearly instantly if the motor drive signal onsignal path 30 is disabled while drivingmotor 34 below the motor speed threshold. Accordingly, alignment ofmark sensor 38 preferably corresponds to a position of the cutting instrument at which there is no danger of trapping tissue between a cutting surface thereof and the cannula opening, andsensor 38 is operable to produce the motor stop identification signal when so aligned withmark mark alignment mark - In one embodiment,
MCU 12 is preferably operable to produce a motor stop signal onsignal path 323 whensensor 38 detects alignment ofmark mark signal path 322. Allowing one passage ofmark sensor 38 after issuing the slowdown signal ensures that the drive speed ofmotor 34 is at or below the motor speed threshold when subsequently issuing the motor stop command, regardless of the position ofmark sensor 38 when the slowdown command was issued. After one passage ofmark sensor 38 since issuing the slowdown signal,MCU 12 is responsive to the signal provided bysensor 38 indicative of alignment ofmark signal path 323. Themotor driver 58 is responsive to the motor stop signal to produce a motor disable signal onsignal path 30. Due to the inherent rotational resistance,motor 34 is responsive to the motor disable signal to immediately cease operation thereof withmark sensor 38, and with the cutting instrument accordingly positioned so as not to trap tissue between any cutting surface thereof and the cannula opening. It is contemplated that the stopped position of the motor, and therefore the cutting surface, may be instead aligned with a predetermined differential distance between themark 76/77 and thesensor 38. The braking characteristics of the cutter and its motor can be ascertained and the stopping distance determined so that this predetermined differential distance can be calibrated accordingly. - For example, with cutting
tool 80,MCU 12 is preferably operable to stop thedrive motor 34 as just described with thecutting blades 84 positioned as illustrated in FIG. 4B, although the present invention contemplates stopping thedrive motor 34 with cuttingblades 84 positioned otherwise relative tocannula opening 68 so long as tissue pinching does not occur as illustrated in FIG. 4D. With cuttingtool 90,MCU 12 is preferably operable to stop thedrive motor 34 as just described with the cuttingopening 94 positioned as illustrated in FIG. 5C, although the present invention contemplates stopping thedrive motor 34 with cuttingopening 94 positioned otherwise relative tocannula opening 68 so long as tissue pinching does not occur as illustrated in FIG. 5D. Finally, with cuttingtool 100,MCU 12 is preferably operable to stop thedrive motor 34 as just described with thecutting opening 104 positioned as illustrated in FIG. 6B, although the present invention contemplates stopping thedrive motor 34 with cuttingopening 104 positioned otherwise relative tocannula opening 68 so long as tissue pinching does not occur as illustrated in FIG. 6C. - In some instances, the actual motor speed will be below the motor speed threshold when the motor stop command is issued by the surgeon. In these instances, the MCU can be programmed to recognize this condition and bypass the requirement of one passage of the
mark - In a further modification, the motor disable signal can be provided to a relay spanning the motor terminals, such as
relay 110 shown in phantom within the handpiece depicted in FIG. 2. Energizing the relay shorts across the terminals to immediately “kill” the motor. This motor short approach adds to the rotational resistance described above to ensure that the motor can be stopped repeatably and reliably. In addition, the shorting relay serves as a sort of fail-safe feature that prevents the possibility that motor can become re-energized while the cutting instrument is being removed from the patient. Alternatively, the motor slowdown signal can be eliminated, but the motor speed signal set to a speed of zero, which effectively results in shorting of the drive outputs. This action is equivalent to activating therelay 110, with the same improvements in stopping time. - In an alternative approach, the motor slowdown signal is eliminated. In this instance, the rotational resistance or natural braking characteristics of the motor and cutter can be quantified to determine how far the motor will rotate once current is terminated to the motor. Current can be supplied to the motor even after a motor stop signal has been received, until the motor control circuit receives a motor stop identification signal generated by the
sensor 38. With the approach, thesensor 38 can be placed offset from the predetermined position at which cutting surface is clear of the cannula cutting opening. Thus, when the signal fromsensor 38 is received, current to the motor can be terminated and the motor will coast to a stop at the appropriate position. - In the prior embodiment, the motor control circuit implements pulse width modulation to control the motor speed and operation. In a further embodiment, a control circuit shown in FIG. 8 relies upon current feedback to control the motor speed. Specifically, the
control circuit 110 includes acurrent sensor 112 and apower amplifier circuit 112. Themotor drive signal 116 is provided at the output of thepower amplifier circuit 112. Aspeed control signal 118 is supplied as an input to theamplifier 114 circuit based upon a throttle position. Thespeed control signal 118 can be supplied at the signal path 32 (FIG. 1). Current to themotor drive signal 116 is delivered through theresistor 122. The output of thepower amplifier circuit 112 is fed directly and throughresistor 122 to adifference amplifier 124 in thecurrent sensor 114. Theoutput 126 of the difference amplifier is provided as a feedback signal to an input of thepower amplifier circuit 112. - The amplifier circuit includes an
op amp 128 that receives thefeedback output 126 and thesignal input 118 conditioned through aresistor 130. Aresistor 134 scales and amplifies the input signals to supply the current signal to themotor drive signal 116. - In one aspect of the present embodiment, a feedback disable
switch 136 is interposed between thefeedback output 126 and the input to thepower amplifier circuit 112. Abraking signal 120 is supplied to theswitch 136 to determine its state. In the illustrated position in FIG. 8, theswitch 136 connects thefeedback output 126 to the power amplifier circuit input. In its alternative position, theswitch 136 connects thefeedback output 126 to ground, thereby disabling the current feedback control feature of thedrive circuit 110. In this instance, the absence of the current feedback increases the natural braking characteristics of the handpiece and drive motor. - The
braking signal input 120 can be derived from themotor stop signal 32 3 identified in FIG. 2. Alternatively, thebraking signal input 120 can be connected to theoutput 32 2, which had been used for a slowdown signal with the motor control circuit shown in FIG. 2. As with the prior embodiments, themotor control circuit 110 relies upon the natural rotational resistance and braking characteristics of the motor and cutter. These characteristics are particularly pronounced for a brushed DC motor and can be readily quantified. - While the invention has been illustrated and described in detail in the foregoing drawings and description, the same is to be considered as illustrative and not restrictive in character, it being understood that only the preferred embodiments have been shown and described and that all changes and modifications that come within the spirit of the invention are desired to be protected.
Claims (26)
Priority Applications (1)
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US09/789,040 US6358263B2 (en) | 1998-10-20 | 2001-02-20 | System for controlling a motor driven surgical cutting instrument |
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Application Number | Priority Date | Filing Date | Title |
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US09/175,293 US6245084B1 (en) | 1998-10-20 | 1998-10-20 | System for controlling a motor driven surgical cutting instrument |
US09/789,040 US6358263B2 (en) | 1998-10-20 | 2001-02-20 | System for controlling a motor driven surgical cutting instrument |
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US09/175,293 Division US6245084B1 (en) | 1998-10-20 | 1998-10-20 | System for controlling a motor driven surgical cutting instrument |
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US09/789,040 Expired - Lifetime US6358263B2 (en) | 1998-10-20 | 2001-02-20 | System for controlling a motor driven surgical cutting instrument |
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US09/175,293 Expired - Lifetime US6245084B1 (en) | 1998-10-20 | 1998-10-20 | System for controlling a motor driven surgical cutting instrument |
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EP (1) | EP1123049B1 (en) |
JP (1) | JP4245276B2 (en) |
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WO2000022994A1 (en) | 2000-04-27 |
EP1123049A4 (en) | 2002-07-31 |
JP4245276B2 (en) | 2009-03-25 |
US6245084B1 (en) | 2001-06-12 |
EP1123049A1 (en) | 2001-08-16 |
US6358263B2 (en) | 2002-03-19 |
DE69935041T2 (en) | 2007-11-15 |
JP2002527186A (en) | 2002-08-27 |
DE69935041D1 (en) | 2007-03-22 |
EP1123049B1 (en) | 2007-01-31 |
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