US20070191713A1 - Ultrasonic device for cutting and coagulating - Google Patents
Ultrasonic device for cutting and coagulating Download PDFInfo
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- US20070191713A1 US20070191713A1 US11/548,407 US54840706A US2007191713A1 US 20070191713 A1 US20070191713 A1 US 20070191713A1 US 54840706 A US54840706 A US 54840706A US 2007191713 A1 US2007191713 A1 US 2007191713A1
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- blade
- clamp
- tissue
- surgical instrument
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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
- A61B17/320068—Surgical cutting instruments using mechanical vibrations, e.g. ultrasonic
- A61B17/320092—Surgical cutting instruments using mechanical vibrations, e.g. ultrasonic with additional movable means for clamping or cutting tissue, e.g. with a pivoting jaw
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/16—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans
- A61B17/1604—Chisels; Rongeurs; Punches; Stamps
- A61B17/1606—Chisels; Rongeurs; Punches; Stamps of forceps type, i.e. having two jaw elements moving relative to each other
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/28—Surgical forceps
- A61B17/2812—Surgical forceps with a single pivotal connection
- A61B17/2841—Handles
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/16—Bone cutting, breaking or removal means other than saws, e.g. Osteoclasts; Drills or chisels for bones; Trepans
- A61B17/1613—Component parts
- A61B17/162—Chucks or tool parts which are to be held in a chuck
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/88—Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
- A61B17/8875—Screwdrivers, spanners or wrenches
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/0042—Surgical instruments, devices or methods, e.g. tourniquets with special provisions for gripping
- A61B2017/00424—Surgical instruments, devices or methods, e.g. tourniquets with special provisions for gripping ergonomic, e.g. fitting in fist
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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
- A61B2017/00477—Coupling
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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
- A61B2017/00681—Aspects not otherwise provided for
- A61B2017/00738—Aspects not otherwise provided for part of the tool being offset with respect to a main axis, e.g. for better view for the surgeon
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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
- A61B17/28—Surgical forceps
- A61B17/2812—Surgical forceps with a single pivotal connection
- A61B17/282—Jaws
- A61B2017/2825—Inserts of different material in jaws
-
- 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
- A61B17/320068—Surgical cutting instruments using mechanical vibrations, e.g. ultrasonic
- A61B2017/320072—Working tips with special features, e.g. extending parts
- A61B2017/320074—Working tips with special features, e.g. extending parts blade
- A61B2017/320075—Working tips with special features, e.g. extending parts blade single edge blade, e.g. for 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
- A61B17/320068—Surgical cutting instruments using mechanical vibrations, e.g. ultrasonic
- A61B17/320092—Surgical cutting instruments using mechanical vibrations, e.g. ultrasonic with additional movable means for clamping or cutting tissue, e.g. with a pivoting jaw
- A61B2017/320093—Surgical cutting instruments using mechanical vibrations, e.g. ultrasonic with additional movable means for clamping or cutting tissue, e.g. with a pivoting jaw additional movable means performing cutting operation
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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
- A61B17/320068—Surgical cutting instruments using mechanical vibrations, e.g. ultrasonic
- A61B17/320092—Surgical cutting instruments using mechanical vibrations, e.g. ultrasonic with additional movable means for clamping or cutting tissue, e.g. with a pivoting jaw
- A61B2017/320094—Surgical cutting instruments using mechanical vibrations, e.g. ultrasonic with additional movable means for clamping or cutting tissue, e.g. with a pivoting jaw additional movable means performing clamping operation
-
- 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
- A61B17/320068—Surgical cutting instruments using mechanical vibrations, e.g. ultrasonic
- A61B17/320092—Surgical cutting instruments using mechanical vibrations, e.g. ultrasonic with additional movable means for clamping or cutting tissue, e.g. with a pivoting jaw
- A61B2017/320095—Surgical cutting instruments using mechanical vibrations, e.g. ultrasonic with additional movable means for clamping or cutting tissue, e.g. with a pivoting jaw with sealing or cauterizing means
Definitions
- the present invention generally relates to ultrasonic surgical systems and, more particularly, to an ultrasonic device that is optimized to allow surgeons to perform cutting, coagulation, and fine dissection required in fine and delicate surgical procedures such as a thyroidectomy.
- Ultrasonic surgical instruments are finding increasingly widespread applications in surgical procedures by virtue of the unique performance characteristics of such instruments.
- ultrasonic surgical instruments can provide substantially simultaneous cutting of tissue and homeostasis by coagulation, desirably minimizing patient trauma.
- the cutting action is typically effected by an end-effector at the distal end of the instrument, which transmits ultrasonic energy to tissue brought into contact with the end-effector.
- Ultrasonic instruments of this nature can be configured for open surgical use, laparoscopic or endoscopic surgical procedures including robotic-assisted procedures.
- Ultrasonic surgical instruments have been developed that include a clamp mechanism to press tissue against the blade of the end-effector in order to couple ultrasonic energy to the tissue of a patient.
- a clamp mechanism to press tissue against the blade of the end-effector in order to couple ultrasonic energy to the tissue of a patient.
- Such an arrangement (sometimes referred to as a clamp coagulator shears or an ultrasonic transector) is disclosed in U.S. Pat. Nos. 5,322,055; 5,873,873 and 6,325,811. The surgeon activates the clamp arm to press the clamp pad against the blade by squeezing on the handgrip or handle.
- Some current designs of clamp coagulator shears utilize a foot pedal to energize the surgical instrument.
- the surgeon operates the foot pedal while simultaneously applying pressure to the handle to press tissue between the jaw and blade to activate a generator that provides energy that is transmitted to the cutting blade for cutting and coagulating tissue.
- Key drawbacks with this type of instrument activation include the loss of focus on the surgical field while the surgeon searches for the foot pedal, the foot pedal getting in the way of the surgeon's movement during a procedure and surgeon leg fatigue during long cases.
- curved end effector balancing which include repositioning the mass along the end effector.
- the drawbacks of such methods are i) high stresses in the curved region, which makes the end effector more prone to fracture if it comes in contact with metal during surgery; ii) a shorter active length, which limits the vessel size that can be operated on, (the active length is defined as the length from the distal end of the blade to where the displacement is one half of the displacement at its distal end); and/or iii) the inability to separately balance orthogonal displacements.
- Some current designs of clamp coagulator shears utilize handles that are either of a pistol or scissors grips design.
- the scissor grip designs may have one thumb or finger grip that is immovable and fixed to the housing and one movable thumb or finger grip. This type of grip may not be entirely familiar to surgeons who use other open-type surgical instruments, such as hemostats, where both thumb and finger grips move in opposition to one another.
- Current designs have scissor arms that rotate around a fixed pivot or rotation point that is perpendicular to the longitudinal axis of the working element. This approach is limited since the relative motion between the two arms is completely rotational. This feature limits the ability to control the pressure profile between the two working ends when fully closed.
- Some current designs of clamp coagulator shears are not specifically designed for delicate procedures where precise dissection, cutting and coagulation are required.
- An exemplary procedure is a thyroidectomy where precise dissection, cutting and coagulation is required to avoid critical blood vessels and nerve bundles.
- An ultrasonic clamp coagulator assembly embodying the principles of the present invention is configured to permit selective dissection, cutting, coagulation and clamping of tissue during surgical procedures.
- a first expression of a first embodiment of the invention is for an ultrasonic waveguide including an ultrasonically actuated blade attached to the distal end of the waveguide; a tissue pad having a tissue engaging surface having a first width and a second width less than the first width; and a clamp member defining a distal portion and a proximal portion and moveable with respect to the blade and having an open position in which at least a portion of the clamp member is spaced from the blade and a closed position in which the clamp member is adjacent to the blade for clamping tissue between the tissue pad and the blade.
- a second expression of a first embodiment includes a clamp member defining a first dimension and a second dimension in a first plane and the first dimension is greater than the second dimension and further defining a first dimension and a second dimension in a second plane and the first dimension is greater than the second dimension.
- a first expression of a third embodiment includes a method of assembling a sterilized ultrasonic clamp coagulator apparatus including the steps of providing an ultrasonic waveguide having a proximal end and a distal end and an ultrasonically actuated blade attached to the distal end of the waveguide; a tissue pad having a flange and a tissue engaging surface having a first width and a second width less than the first width; a clamp member moveable with respect to said end-effector and having an open position in which at least a portion of the clamp member is spaced from the blade and a closed position in which the clamp member is adjacent to the blade for clamping tissue between the tissue pad and the blade, and where the clamp member includes a slot for slidably receiving the flange and slidably engaging the flange within the slot and then sterilizing the clamp coagulator apparatus.
- a first expression of a fourth embodiment of an ultrasonic surgical instrument is for a housing configured to accept a transducer and further defining a longitudinal axis; a first switch positioned on the housing for actuation by one or more fingers of a user in a direction parallel to the longitudinal axis and further electrically connected to a generator for providing an electrical signal to the generator for controlling a first level of ultrasonic energy delivered by the transducer.
- a second expression of a fourth embodiment of an ultrasonic surgical instrument is for a second switch positioned on the housing for actuation by one or more fingers of a user in a direction parallel to the longitudinal axis and further electrically connected to a generator for providing an electrical signal to the generator for controlling a second level of ultrasonic energy delivered by the transducer.
- a first expression of a fifth embodiment of an ultrasonic surgical instrument is for an ultrasonic waveguide defining a longitudinal axis, having a proximal end, a most distal node and a distal end and an ultrasonically actuated blade positioned at the distal end of the waveguide and which defines a functional asymmetry within a first plane, a first balance asymmetry distal to the most distal node and proximal to the blade; and a second balance asymmetry proximal to the most distal node.
- a first expression of a sixth embodiment of an ultrasonic surgical instrument is for a housing, an outer shroud having a proximal end joined to the housing, an ultrasonic waveguide positioned within the outer tube, an ultrasonically actuated blade positioned at the distal end of the waveguide, and an actuating lever for operating a clamp arm located at the distal end of the lever.
- the actuating lever has camming members, which operatively engage the outer tube such that movement of the actuating lever positions the clamp arm between open and clamped positions relative to the blade.
- a second expression of a sixth embodiment of an ultrasonic instrument is for stationary finger ring that defines an opening having a length L and the housing and a transducer are sized to position a center of gravity of the surgical instrument at the housing within the dimension of length L.
- a first expression of a first embodiment of a torque wrench for use with an ultrasonic clamp coagulator apparatus is for a hand wrench body, a cantilever arm movably attached to said wrench body, at least one tooth located at the cantilever arm's distal end, and an adaptor rotatably attached to the hand wrench and comprising a cam for operatively engaging the tooth.
- FIG. 1 is a perspective view illustrating an embodiment of an ultrasonic surgical instrument in accordance with the present invention
- FIG. 2 is a perspective assembly view of FIG. 1 ;
- FIG. 3A is a perspective view of one embodiment of a waveguide and blade in accordance with the present invention.
- FIG. 3B is an elevation view of the waveguide and blade of FIG. 3A ;
- FIG. 3C is an elevation view of an alternate embodiment of a waveguide and blade in accordance with the present invention.
- FIG. 3D is an elevation view of an alternate embodiment of a waveguide and blade in accordance with the present invention.
- FIG. 3E is an elevation view of an alternate embodiment of a waveguide and blade in accordance with the present invention.
- FIG. 3F is an alternate view of the embodiment of the waveguide and blade of FIG. 3E ;
- FIG. 3G is an elevation view of an alternate embodiment of a waveguide and blade in accordance with the present invention.
- FIG. 4 is a graph illustrating the displacement profile of the present invention and the prior art
- FIG. 5 is a graph illustrating an alternate displacement profile of the present invention and the prior art
- FIG. 6A is an elevation view of the waveguide and blade of FIGS. 3 E-F illustrating one embodiment of the radius of curvature of the blade;
- FIG. 6B is an exploded view of one embodiment of the blade of FIG. 6A and a radius cut;
- FIG. 6C is an alternate view of the embodiment of FIG. 6A ;
- FIG. 6D is a section view of the embodiment of FIG. 6B ;
- FIG. 7A is an elevation view of an end effector in accordance with the present invention.
- FIG. 7B is a plan view of the end effector of FIG. 7A ;
- FIG. 8 is a perspective view from proximal to distal end of a clamp member in accordance with the present invention.
- FIG. 9A is a plan view of a tissue pad in accordance with the present invention.
- FIG. 9B is a plan view of the opposite face of the tissue pad of FIG. 9A ;
- FIG. 9C is an elevation view the tissue pad of FIGS. 9 A-B;
- FIG. 10A is a perspective view of an alternate expression of the clamp member
- FIG. 10B is a perspective view of the clamp member of FIG. 10A and a first tissue pad
- FIG. 10C is a perspective view of the clamp member of FIG. 10A and a first and second tissue pad;
- FIG. 11A -B are an alternate expressions for a first and second tissue pad
- FIG. 11C is a perspective view of an alternate expression of a clamp arm for use with the tissue pads of FIGS. 11 A-B;
- FIG. 11D is an alternate view of the clamp are of FIG. 11C ;
- FIG. 11E is a cut-away view of an assembled clamp arm and tissue pad assembly of FIGS. 11 A-D
- FIG. 12A is a perspective view of an alternate embodiment of a clamp arm having a distal connection point
- FIG. 12B is a perspective view of an alternate embodiment of a tissue pad having a distal connection member
- FIG. 12C is a perspective view of an assembled clamp arm and tissue pad of FIGS. 12 A-B;
- FIG. 13 is a partial view of the distal end of the ultrasonic instrument in accordance with the present invention.
- FIG. 14 is an exploded elevation view of one part of the clamp arm and clamp member and cam members
- FIG. 15 is an exploded view of the outer shroud and cam slots
- FIG. 16A is an elevation view of an ultrasonic instrument and pushbutton assembly in accordance with the present invention.
- FIG. 16B is an elevation view of the two piece assembly of a push button in accordance with the present invention.
- FIG. 16C is a cut-away elevation view showing the interface among the switch housing, transducer, waveguide and housing;
- FIG. 16D is a perspective elevation view of a switch housing in accordance with the present invention.
- FIG. 16E is an alternate view of the switch housing of FIG. 16D ;
- FIG. 16F is a view of a flex circuit in accordance with the present invention.
- FIG. 16G is an electrical schematic of the hand switch circuit
- FIG. 17A is an elevation view of an ultrasonic instrument in accordance with the present invention as may be grasped by a user;
- FIG. 17B is an exploded view of the finger and thumb interface of a ultrasonic instrument in accordance with the present invention.
- FIG. 18 is an elevation view of an ultrasonic instrument in accordance with the present invention as may be grasped by a user and defining a center of gravity;
- FIG. 19A is a perspective view of a two-piece torque wrench in accordance with the present invention.
- FIG. 19B is a perspective view of a hand wrench in accordance with the present invention.
- FIG. 19C is an elevation view of the hand wrench of FIG. 19B ;
- FIG. 19D is a cross sectional end view of the distal end of a hand wrench depicting cantilever arm and teeth geometry
- FIG. 19E is a cross sectional view of an adaptor depicting spline gear geometry
- FIG. 19F is a perspective view of an adaptor for use with a hand wrench in accordance with the present invention.
- FIG. 19G is a partial perspective view of a hand wrench interfacing with an ultrasonic instrument in accordance with the present invention.
- the present invention is particularly directed to an improved ultrasonic surgical clamp coagulator apparatus which is configured for effecting tissue cutting, coagulation, and/or clamping during surgical procedures, including delicate surgical procedures, such as a thyroidectomy.
- the present apparatus is configured for use in open surgical procedures. Versatile use is facilitated by selective use of ultrasonic energy.
- ultrasonic components of the apparatus When ultrasonic components of the apparatus are inactive, tissue can be readily gripped and manipulated, as desired, without tissue cutting or damage.
- the ultrasonic components When the ultrasonic components are activated, the apparatus permits tissue to be gripped for coupling with the ultrasonic energy to effect tissue coagulation, with application of increased pressure efficiently effecting tissue cutting and coagulation. If desired, ultrasonic energy can be applied to tissue without use of the clamping mechanism of the apparatus by appropriate manipulation of the ultrasonic blade.
- the present clamp coagulator apparatus is particularly configured for disposable use by virtue of its straightforward construction. As such, it is contemplated that the apparatus be used in association with an ultrasonic generator unit of a surgical system, whereby ultrasonic energy from the generator unit provides the desired ultrasonic actuation for the present clamp coagulator apparatus. It will be appreciated that a clamp coagulator apparatus embodying the principles of the present invention can be configured for non-disposable or multiple use, and non-detachably integrated with an associated ultrasonic generator unit. However, detachable connection of the present clamp coagulator apparatus with an associated ultrasonic generator u nit is presently preferred for single-patient use of the apparatus.
- the surgical system 19 includes an ultrasonic generator 30 connected to an ultrasonic transducer 50 via cable 22 , and an ultrasonic surgical instrument 100 .
- the ultrasonic transducer 50 is referred to as a “hand piece assembly” because the surgical instrument of the surgical system 19 is configured such that a surgeon may grasp and manipulate the ultrasonic transducer 50 during various procedures and operations.
- a suitable generator is the GEN04 (also referred to as Generator 300 ) sold by Ethicon Endo-Surgery, Inc. of Cincinnati, Ohio.
- a suitable transducer is disclosed in co-pending U.S. patent application filed on Oct. 10, 2006, Ser. No. ______ (Attorney Docket# END5747USNP1), entitled MEDICAL ULTRASOUND SYSTEM AND HANDPIECE AND METHODS FOR MAKING AND TUNING, the contents which are incorporated by reference herein.
- the acoustic assembly of surgical instrument 100 generally includes a first acoustic portion and a second acoustic portion.
- the first acoustic portion comprises the ultrasonically active portions of ultrasonic transducer 50
- the second acoustic portion comprises the ultrasonically active portions of transmission assembly 71 .
- the distal end of the first acoustic portion is operatively coupled to the proximal end of the second acoustic portion by, for example, a threaded connection.
- the ultrasonic surgical instrument 100 includes a multi-piece handle assembly 68 adapted to isolate the operator from the vibrations of the acoustic assembly contained within transducer 50 .
- the handle assembly 68 can be shaped to be held by a user in a conventional mariner, but it is contemplated that the present ultrasonic surgical instrument 100 principally be grasped and manipulated in a scissor-like arrangement provided by a handle assembly of the instrument, as will be described. While multi-piece handle assembly 68 is illustrated, the handle assembly 68 may comprise a single or unitary component.
- the proximal end of the ultrasonic surgical instrument 100 receives and is fitted to the distal end of the ultrasonic transducer 50 by insertion of the transducer into the handle assembly 68 .
- the ultrasonic surgical instrument 100 may be attached to and removed from the ultrasonic transducer 50 as a unit.
- the ultrasonic surgical instrument 100 may include a handle assembly 68 , comprising mating housing portions 69 and 70 and an ultrasonic transmission assembly 71 .
- the elongated transmission assembly 71 of the ultrasonic surgical instrument 100 extends orthogonally from the instrument handle assembly 68 .
- the handle assembly 68 may be constructed from a durable plastic, such as polycarbonate or a liquid crystal polymer. It is also contemplated that the handle assembly 68 may alternatively be made from a variety of materials including other plastics, ceramics or metals. Traditional unfilled thermoplastics, however, have a thermal conductivity of only about 0.20 W/m° K. (Watt/meter-° Kelvin). In order to improve heat dissipation from the instrument, the handle assembly may be constructed from heat conducting thermoplastics, such as high heat resistant resins liquid crystal polymer (LCP), Polyphenylene Sulfide (PPS), Polyetheretherketone (PEEK) and Polysulfone having thermal conductivity in the range of 20-100 W/m° K. PEEK resin is a thermoplastics filled with aluminum nitride or boron nitride, which are not electrically conductive. The thermally conductive resin helps to manage the heat within smaller instruments.
- LCP high heat resistant resins liquid crystal polymer
- PPS Poly
- the transmission assembly 71 includes a waveguide 80 and a blade 79 . It will be noted that, in some applications, the transmission assembly is sometimes referred to as a “blade assembly”.
- the waveguide 80 which is adapted to transmit ultrasonic energy from transducer 50 to the tip of blade 79 may be flexible, semi-flexible or rigid.
- the waveguide 80 may also be configured to amplify the mechanical vibrations transmitted through the waveguide 80 to the blade 79 as is well known in the art.
- the waveguide 80 may further have features to control the gain of the longitudinal vibration along the waveguide 80 and features to tune the waveguide 80 to the resonant frequency of the system.
- waveguide 80 may have any suitable cross-sectional dimension.
- the waveguide 80 may have a substantially uniform cross-section or the waveguide 80 may be tapered at various sections or may be tapered along its entire length.
- Ultrasonic waveguide 80 may, for example, have a length substantially equal to an integral number of one-half system wavelengths (n ⁇ /2).
- the ultrasonic waveguide 80 and blade 79 may be preferably fabricated from a solid core shaft constructed out of material, which propagates ultrasonic energy efficiently, such as titanium alloy (i.e., Ti-6Al-4V), aluminum alloys, sapphire, stainless steel or any other acoustically compatible material.
- Ultrasonic waveguide 80 may further include at least one radial hole or aperture 66 extending therethrough, substantially perpendicular to the longitudinal axis of the waveguide 80 .
- the aperture 66 which may be positioned at a node, is configured to receive a connector pin 27 , discussed below, which connects the waveguide 80 , to the handle assembly 70 .
- Blade 79 may be integral with the waveguide 80 and formed as a single unit. In an alternate expression of the current embodiment, blade 79 may be connected by a threaded connection, a welded joint, or other coupling mechanisms. The distal end of the blade 79 is disposed near an anti-node 85 in order to tune the acoustic assembly to a preferred resonant frequency f o when the acoustic assembly is not loaded by tissue.
- blade 79 or blade tip 79 a When ultrasonic transducer 50 is energized, the distal end of blade 79 or blade tip 79 a is configured to move substantially longitudinally (along the x axis) in the range of, for example, approximately 10 to 500 microns peak-to-peak, and preferably in the range of about 20 to about 200 microns at a predetermined vibrational frequency f o of, for example, 55,500 Hz. Blade tip 79 a also preferably vibrates in the y axis at about 1 to about 10 percent of the motion in the x axis.
- the blade tip 79 a provides a functional asymmetry or curved portion for improved visibility at the blade tip so that a surgeon can verify that the blade 79 extends across the structure being cut or coagulated. This is especially important in verifying margins for large blood vessels.
- the geometry also provides for improved tissue access by more closely replicating the curvature of biological structures.
- Blade 79 provides a multitude of edges and surfaces, designed to provide a multitude of tissue effects: clamped coagulation, clamped cutting, grasping, back-cutting, dissection, spot coagulation, tip penetration and tip scoring.
- Blade tip 79 a is commonly referred to as a functional asymmetry. That is, the blade (functionally, the blade provides a multitude of tissue effects) lies outside the longitudinal axis of waveguide 80 (that is, asymmetrical with the longitudinal axis), and accordingly creates an imbalance in the ultrasonic waveguide. If the imbalance is not corrected, then undesirable heat, noise, and compromised tissue effect occur.
- transmission assembly 71 includes one or more balancing features placed at blade 79 , at a position proximal and/or distal to the distal most node 84 .
- the balancing features at the waveguide 80 are shaped to balance the two orthogonal modes in the y and z axes, separately. The size and shape and location of the balance features allow flexibility to reduce stress at the blade 79 , make the active length longer and separately balance the two orthogonal modes.
- FIGS. 3 A-B show a single balance cut 82 at the waveguide 80 distal to node 84 .
- balance cut 82 has side walls perpendicular to the longitudinal axis of waveguide 80 and the bottom cut is parallel to the longitudinal axis of waveguide 80 .
- the high stresses experienced during operation are localized at the balancing cut 82 , which is away from the more sensitive curved region at the blade 79 .
- FIG. 3C shows two balancing features 82 and 82 a , one distal and one proximal to the node 84 .
- Adding second balance cut 82 a , proximal to node 84 further eliminates the orthogonal bending modes thereby providing a more pure longitudinal motion (x direction) and removing the overlapping bending modes (y and z direction). Accordingly, the blade 79 is better balanced and has a longer active length.
- FIG. 3D shows two balancing features 82 c and 82 a , distal and proximal to the node 84 .
- An angled bottom cut at balance feature 82 c allows individual balancing of the bending mode in the z direction.
- FIGS. 3 E-F show two balancing features 82 and 82 d , distal and proximal to the node 84 .
- the side walls of balance feature 82 d are angled with respect to each other in the x-z plane and provide for individual balancing of the bending mode in the y direction.
- the angled side walls define an, included angle ? of between 1° and about 90°, preferably between about 15° and about 25°, and more preferably between about 19° and about 21°.
- the weight removed at each balance feature is a function of multiple parameters including the radius of curvature at blade tip 79 a and the desired level of removal of the overlapping bending modes in the y and z direction.
- the balance cut 82 represents a weight reduction of about 0.003 to about 0.004 oz., and most preferably about 0.0034 oz.
- the balance cut 82 d represents a weight reduction of about 0.004 to about 0.005 oz., and most preferably about 0.0043 oz.
- FIG. 3G shows one balance cut 82 e in the curved blade region in addition to balance feature 82 , distal to node 84 .
- Balance cut 82 e allows for balancing as well as improved acoustic performance as a result of wide frequency separation of transverse modes from the fundamental frequency, which is the longitudinal mode frequency.
- balance cuts 82 through 82 e are possible to provide balancing of a waveguide and curved blade.
- FIG. 4 shows that the profile produced by the balancing cut features of FIG. 3E produces a 1.3 mm longer active length along the longitudinal displacement direction than is available from an LCS-C5 ultrasonic clamp coagulator, sold by Ethicon Endo-Surgery, Inc. (where the y axis is representative of the ratio between the displacement anywhere along blade tip 79 a and the displacement at the most distal end of blade tip 79 a ).
- a longer active length is desirable for cutting and coagulating large vessels, for example, 5-7 mm vessels.
- FIG. 5 shows that the profile produced by the balancing features of FIG. 3E produces a 2.5 mm longer active length (along the vector sum of displacements in the x, y and z directions) than is available from an LCS-C5 ultrasonic clamp coagulator, which is desirable for cutting and coagulating large vessels, for example, 5-7 mm vessels.
- an outer tubular member or outer shroud 72 attaches to the most proximal end of handle assembly 70 .
- Attached to the distal end of the outer shroud 72 is a distal shroud 76 .
- Both the outer shroud 72 and distal shroud 76 may attach via a snap fit, press fit, glue or other mechanical means.
- Extending distally from the distal shroud 76 is the end-effector 81 , which comprises the blade 79 and clamp member 56 , also commonly referred to as a jaw, in combination with one or more tissue pads 58 .
- a seal 83 may be provided at the distal-most node 84 , nearest the end-effector 81 , to abate passage of tissue, blood, and other material in the region between the waveguide 80 and the distal shroud 76 .
- Seal 83 may be of any known construction, such as an o-ring or silicon overmolded at node 84 .
- blade 79 is curved along with the associated clamp member 56 .
- One benefit of the invention, however, is the ability to perform finer, more delicate surgical procedures. It is also multifunctional and able to dissect tissue as well as coagulate and transect.
- the ability to finely dissect is enabled primarily by the tapering of the end effector 81 .
- the end effector is tapered in two planes, which mimics typical hemostats. This allows the user to create windows in the tissue and then spread the tissue apart more easily.
- the blade 79 and clamp member 56 are tapered in both the x and z directions from the proximal end to the distal end.
- the pad 58 is only tapered in the Z direction. That is, the clamp pad 58 has a constant thickness, but the width of the clamp pad 58 at the distal end is less than the width at the proximal end. Accordingly, the surface area of section A is greater than the surface area of section B.
- the radius at the distal end of the blade 79 and clamp member 56 also promotes fine dissection.
- the radius at the tip of the clamp member 56 is approximately 0.040 inches, and the blade radius is approximately 0.045 inches.
- blade 79 is defined by an inside radius R 1 and an outside radius R 2 measured at a distance D 1 from the longitundinal axis.
- the dimensions R 1 , R 2 and D 1 are selected in combination with the balance cuts previously discussed.
- R 1 is from about 0.80 inches to about 1.00 inches and most preferably about 0.95 inches
- R 2 is from about 0.90 inches to about 1.10 inches and most preferably about 1.04 inches
- D 1 is from about 0.90 inches to about 1.10 inches and most preferably about 0.99 inches.
- FIGS. 6B and 6D further illustrate a second expression of the blade 79 .
- Illustrated is a radius cut 90 in blade 79 to provide two back cutting edges 92 and 92 a .
- radius cut 90 also provides a balance asymmetry within the functional symmetry to help balance the orthogonal modes.
- the back cutting edges 92 and 92 a are positioned opposite the clamp pad 58 ( FIG. 7B ) to allow the surgeon to perform tissue cutting procedures without the assistance of the clamp pad 58 .
- the radius cut is distal to the most distal tip of blade 79 to allow for a blunt radius tip for tissue dissection as discussed above.
- a radius cut R 3 is swept across an angle F measured at a distance D 2 from the longitudinal axis and starting a distance D 3 from the distal tip of blade 79 .
- R 3 is from about 0.030 inches to about 0.060 inches and most preferably about 0.050 inches; angle F is from about 20° to about 35° and most preferably about 30°; D 2 is about 0.90 inches to about 1.10 inches and most preferably about 0.99 inches; and D 3 is from about 0.085 inches to about 0.11 inches and most preferably about 0.09 inches.
- FIG. 6C illustrates a taper defined by angle O relative to an axis parallel to the longitudinal axis of waveguide 80 from the proximal end of blade 79 to the distal end of blade 79 .
- the taper may be on the blade surface that contacts tissue pad 58 ( FIG. 7A ).
- the taper may be the defined by the opposite surface comprising radius cut 90 .
- angle O ranges from about 0.5° to about 5°, and preferably from about 1.5° to about 2°.
- waveguide 80 is positioned within cavity 59 of handle assembly 68 .
- pin 27 extends through opening 66 of waveguide 80 (located at a node) and engages channel 28 (formed by the mating of housing portions 69 and 70 ).
- pin 27 is made of any compatible metal, such as stainless steel or titanium or a durable plastic, such as polycarbonate or a liquid crystal polymer.
- pin 27 is partially coated with an elasto-meric material 30 , such as silicon for that portion 29 of pin 27 that extends through waveguide 80 and uncoated for that portion of pin 27 that engages members 69 and 70 .
- the silicone provides insulation from the vibrating blade throughout the length of hole 66 . This enables high efficiency operation whereby minimal overheating is generated and maximum ultrasonic output power is available at the blade tip for cutting and coagulation.
- the lack of insulation allows pin 27 to be held firmly within handle assembly 68 due to the lack of insulation, which would provide deformation and movement if pin 27 were completely coated with an insulating material.
- clamp member 56 has a shaped slot 57 for accepting one or more tissue pads. This configuration prevents mis-loading of the tissue pads and assures that the appropriate pad is loaded at the correct location within clamp member 56 .
- clamp member 56 may comprise a T-shaped slot 57 to accept a T-shaped flange 55 of clamp pad 58 .
- Two mechanical stops 59 and 59 a when depressed, engage the proximal end of clamp pad 58 to secure the clamp pad within clamp member 56 .
- flanges and corresponding slots may have alternate shapes and sizes to secure the clamp pads to the clamp arm.
- the illustrated flange configurations shown are exemplary only and accommodate the particular clamp pad material of one embodiment, but the particular size and shape of the flange may vary, including, but not limited to, flanges of the same size and shape.
- the flange may be of one configuration.
- other tab stops are possible and may include any of the multiple methods of mechanically attaching the clamp pads to the clamp arm, such as rivets, glue, press fit or any other fastening means well know to the artisan.
- clamp pad 58 consists of a first tissue pad 58 b and a second pad portion 58 a , which may be an insert within pad 58 b .
- Tissue pad 58 b may comprise a tissue engaging surface having saw tooth-like teeth and proximal portion 58 a may have a smoother surface relative to pad 58 b .
- the advantage of two separate components 58 a and 58 b is that each pad may be constructed from different materials.
- having a two-piece tissue pad allows the use of a very lubricious material at the distal end that is not particularly resistant to high temperatures compared to a very high temperature material at the proximal end that is not particularly lubricious because the proximal end is an area of lower amplitude.
- Such a configuration matches the tissue pad materials to the amplitude of the blade 79 .
- clamp pad 58 b is formed from TEFLON® or any other suitable low-friction material.
- Clamp pad 58 a is formed from a base material and at least one filler material, which is a different material from the base material.
- the surface of proximal clamp pad 58 a may be smoother than distal clamp pad 58 b , or proximal clamp pad 58 a may also have a similar type saw-tooth configuration.
- tissue pad with a base material and at-least-one filler material allows the base material and the at-least-one filler material to be chosen with a different hardness, stiffness, lubricity, dynamic coefficient of friction, heat transfer coefficient, abradability, heat deflection temperature, glass transition temperature and/or melt temperature to improve the wearability of the tissue pad, which is important when high clamping forces are employed because tissue pads wear faster at higher clamping forces than at lower clamping forces.
- a tissue pad with a base material and at least two filler materials allows the base material and the at-least-two filler materials to be chosen with a different hardness, stiffness, lubricity, dynamic coefficient of friction, heat transfer coefficient, abradability, heat deflection temperature, and/or melt temperature to improve the wearability of the tissue pad, which is important when high clamping forces are employed because tissue pads wear faster at higher clamping forces than at lower clamping forces.
- a 15% graphite-filled, 30% PTFE-filled polyimide tissue pad showed substantially the same or better wear with a 4.5 pound clamping force as a 100% polytetrafluoroethylene tissue pad showed with a 1.5 pound clamping force.
- the advantage of a 15% graphite-filled, 30% PTFE-filled polyimide tissue pad is increased heat resistance, which improves the overall wear resistance of the tissue pad.
- This polyimide-composite clamp pad has a useful heat resistance up about 800° F. to about 1200° F., as compared to a useful heat resistance up to about 660° F. of a PTFE clamp pad.
- Other materials are also useful for a portion of the tissue pad, such as ceramics, metals, glasses and graphite.
- FIGS. 10 A-C disclose a first expression of an embodiment of attaching a two part clamp pad 58 a - b to a clamp member 56 .
- at least two slots 57 a and 57 b are shaped to accept two correspondingly shaped flanges 55 a and 55 ′.
- T-slot 57 a accepts a corresponding T-flange 55 a of clamp pad 58 a
- wedge-shaped slot 57 ′ accepts a corresponding wedge-shaped shaped flange 55 ′ of clamp pad 58 b.
- FIGS. 11 A-E illustrate a second expression of attaching a clamp pad 58 c to a clamp arm 56 c .
- Clamp pad 58 c comprises one or more protrusions 62 for insertion into one or more corresponding apertures 63 in clamp arm 56 c . If a second or more clamp pad(s) 58 d is also used in accordance with the previous discussion, then clamp pad 58 c further comprises corresponding aperture 61 for accepting one or more clamp pad(s) 58 d .
- Clamp arm 56 c has corresponding aperture(s) 63 for accepting protrusions 62 , as well as a corresponding cavity 64 for accepting the one or more clamp pad 58 d .
- FIG. 11E illustrates the components assembled together prior to staking.
- Clamp pad 58 d fits inside the aperture 61 and cavity 64 , and pad 58 c is aligned with clamp arm 56 c so that protrusions 62 align with chamfered aperture 63 .
- Protrusions 62 have additional height beyond the top surface of clamp arm 56 c to provide additional material to fill the chamfered volume during staking. Heat is applied to protrusions 62 above the clamp arm 56 c ; the protrusions deform and take the shape of the chamfered volume.
- FIGS. 12 A-C illustrate a third expression of attaching a clamp pad 58 d to a clamp arm 56 d .
- clamp pad 58 d further comprises a hook-like protrusion or clip 65 for attaching to a corresponding opening 66 at the distal tip of clamp arm 56 d .
- the distal tip of clamp arm 56 d is open and the clamp pad 58 d is inserted from the distal to proximal direction until the hook clip engages opening 66 .
- Hook clip 65 may be biased closed so when clip 65 engages opening 66 , clip 65 applies compressive forces against opening 66 .
- a first expression for a method for inserting a clamp pad on a clamp arm includes a) inserting a first clamp pad having a first width dimension greater than a second width dimension and having a first-shaped flange into a clamp arm having a slot that accepts the first-shaped flange; and b) engaging a pad stop to secure the clamp pad within the clamp arm.
- the clamp pad consists of a second clamp pad fabricated from a base material and at least one filler material, which is a different material from the base material.
- the second clamp pad may have a second-shaped flange for engaging a second-shaped slot on the clamp arm.
- the tissue surfaces of the clamp pads may be smooth or have tissue gripping features, such as a saw-tooth configuration.
- a first expression for a method for replacing clamp pads would include the steps of: a) disengaging a pad stop; b) removing a first clamp pad from the clamp arm; c) removing a second clamp pad from the clamp arm, wherein at least one of the first or second clamp pads has a first width dimension greater than a second width dimension; d) inserting third and fourth clamp pads into the clamp arm wherein at least one of the third or fourth clamp pads has a first width dimension greater than a second width dimension; and e) engaging a pad stop to secure the third and fourth clamp pads within the clamp arm.
- one of the third and fourth clamp pads may be fabricated from a polymeric material such as TEFLON, and the other clamp pad may be fabricated from a base material and at least one filler material, which is a different material from the base material.
- the tissue surfaces of the clamp pads may be smooth or have tissue gripping features, such as a saw-tooth configuration.
- a clamp arm 60 is configured for use with the present ultrasonic surgical instrument 100 and for cooperative action with blade 79 and clamp member 56 .
- the clamp arm 60 is rotatably mounted to the distal end of outer shroud 72 , detailed below, and connectably attaches at the distal end of thumb ring or actuation member 34 .
- Clamp pad 58 mounts on the clamp member 56 for cooperation with blade 79 , with rotational movement of the clamp arm 60 positioning the clamp pad in substantially parallel relationship to, and in contact with, blade 79 , thereby defining a tissue treatment region.
- tissue is grasped between clamp pad 58 and blade 79 .
- Pivotal movement of the clamp member 56 with respect to blade 79 is affected by the provision of a pair of camming members on the clamp arm 60 that interface with the outer shroud 72 .
- the outer shroud 72 is grounded to handle 68 .
- a first expression of clamp arm 60 comprises jaw-carrying member 60 a and mating member 60 b .
- Jaw-carrying member 60 a includes two camming members 94 a and 94 b for mating with two corresponding camming slots 95 a and 95 b located outer shroud 72 .
- Mating member 60 b includes two camming members 96 a and 96 b for mating with two corresponding camming slots 97 a and 97 b located outer shroud 72 .
- Corresponding camming members 94 a / 94 b and 96 a / 96 b may align along common axes perpendicular to the longitudinal axis of waveguide 80 or camming members may be offset to facilitate the assembly process.
- Members 60 a and 60 b fixedly attach to each other as shown in FIG. 13 to form clamp arm 60 via press fit or snap fit. Other attaching methods are available as is known to those skilled in the art, such as welding, glue, screwing, etc.
- clamp arm 60 defines an opening 93 for receiving outer shroud 72 and the interlocking of the respective cam members and cam slots.
- members 60 a and 60 b may be assembly around outer shroud 72 and all three elements mated together in one operation.
- One benefit of the cam open and closure mechanism is that it can provide both a rotational motion and linear motion of the clamp arm 60 and clamp member 56 thereby providing better control of the pressure profile between clamp pad 58 and blade 79 .
- the camming members may be replaced with spherical elements that interface with cam slots.
- camming members may be replaced with spherical depressions for receiving ball bearings that interface with the cam slots.
- Other camming mechanism would be useful as is well known to the skilled artisian.
- a force limiting element 98 such as an elastomer or coil or leaf spring, may be inserted within one or more cam slots and provide a force limit to the coaptation force seen at the end effector 81 .
- the spring constant of an elastomer or spring ranges from 10-500 lb./in.
- Outer shroud 72 , distal shroud 76 and clamp arm 60 may be constructed from any number of biocompatible materials, such as titanium, stainless steel or plastics. Preferably, however, these elements are constructed of either 7075 or 6061 T6 aluminum.
- the aluminum provides a large benefit in terms of heat dissipation. Devices of the prior art have sheaths and clamp arms made of stainless steel. Typical values for thermal conductivity for aluminum are around 250 W/m K. The values for stainless steel are around 16 W/m K. Thus, aluminum has approximately 15 times greater capability to transmit heat through the same amount of volume.
- the present invention operates approximately 150° F. lower in temperature than instruments of the prior art.
- the aluminum components more effectively draw the heat away from the pad and the blade, thus keeping the end effector cooler than other prior art instruments.
- housing 68 includes a proximal end, a distal end, and a cavity 59 extending longitudinally therein. Cavity 59 is configured to accept a switch assembly 300 and the transducer assembly 50 .
- the distal end of transducer 50 threadedly attaches to the proximal end of transmission rod 80 .
- the distal end of transducer 50 also interfaces with switch assembly 300 to provide the surgeon with finger-activated controls on surgical instrument 19 .
- Transducer 50 includes a first conductive ring 400 and a second conductive ring 410 which are securely disposed within the transducer body 50 as is described in co-pending application Ser. No. ______ (Attorney docket no. END5747USNP2).
- Switch assembly 300 comprises a pushbutton assembly 310 , a flex circuit assembly 330 , a switch housing 350 , a first pin conductor 360 and a second pin conductor 370 .
- Switch housing 350 is saddle-shaped and is supported within handle assembly 68 by way of corresponding supporting mounts on switch housing 350 and housing portions 69 and 70 .
- Housing 350 defines a first receiving area 353 for a dome switch, and a second receiving area 351 for a dome switch.
- pins 360 and 370 are electrically connected to dome switch 332 and 334 via conductors 337 and 335 , respectively, at one end and to the distal end of transducer 50 at a second end.
- Pins 360 and 370 each have a spring-loaded tip 361 and 371 that interface with transducer 50 as shown in FIG. 16C .
- Each end 361 and 371 have a 0.050 inch working travel to allow for manufacturing tolerances associated with the stackup of the assembled parts.
- Slidably attached to housing 68 are two triggers 320 and 322 , each comprising first and second halves 320 a , 320 a and 322 a , 322 b , respectively. Shown in FIG.
- trigger 320 which comprises ridges 321 a and b and contact surface 323 (made up of mating surfaces 323 a and 323 b ).
- triggers 320 and 322 slidably attach to housing 68 and contact surfaces 323 and 325 mechanically engage dome switches 332 and 334 , respectively.
- Ridges 321 and 326 provide interface between the user and triggers 320 and 322 . Ridges 321 and 326 are designed to provide as much surface area for the user to depress in order to activate the instrument.
- switch assembly 300 elastomeric connectors having copper traces etched onto the elastomer press fit into switch housing 350 to provide the electrical interconnect between transducer 50 and flex circuit 330 .
- One end of the elastomer connectors electrically engage dome switches 332 and 334 via conductors 337 and 335 .
- the other end of the elastomer connectors slidably interface with conductors 400 and 410 of transducer 50 . Compression of the elastomer connectors allow a working travel of up to 20% of the total height of the elastomer connectors to allow for manufacturing tolerances associated with the stackup of the assembled parts.
- a flex circuit 330 provides for the electromechanical interface between pushbuttons 321 and 322 and the generator 30 via transducer 50 .
- Flex circuit comprises two dome switches 332 and 334 that are mechanically actuated by depressing pushbuttons 321 or 322 axially in the x direction.
- Dome switches 332 and 334 are electrical contact switches, that when depressed provide an electrical signal to generator 30 as shown by the electrical wiring schematic of FIG. 16G .
- Flex circuit 330 also comprises two diodes within a diode package 336 and conductors, 335 and 337 as is known to those in the art, that connect to pins 360 and 370 , respectively, which in turn provide electrical contact to ring conductors 400 and 410 , which in turn are connected to conductors in cable 22 that connect to generator 30 .
- Flex circuit 330 generally sits within a channel 352 of switch assembly 350 so that dome switches 332 and 334 interface with the corresponding backing surfaces 351 and 353 .
- Backing surfaces provide a firm support for the dome switches during operation, discussed below.
- Dome switches 332 and 334 may be fixedly attached to backing surfaces 351 and 353 by any convenient method, such as, an adhesive.
- the generator will respond with a certain energy level, such as a maximum (“max”) power setting; when the surgeon depresses pushbutton 322 , the generator will respond with a certain energy level, such as a minimum (“min”) power setting, which conforms to accepted industry practice for pushbutton location and the corresponding power setting.
- a certain energy level such as a maximum (“max”) power setting
- a certain energy level such as a minimum (“min”) power setting
- the pushbutton axial actuation reduces stress on the surgeon's fingers and allows the fingers to actuate force in a more ergonomic position preventing stresses at the hands and wrists.
- the switch movement also allows comfortable button activation in less than optimal hand positions, which surgeons often encounter throughout a typical procedure.
- each access ring 35 and 36 At the proximal end of each access ring 35 and 36 are protrusions 37 and 38 , respectively, that allow the surgeon to rest his or her pinky finger for added control and comfort. This also allows the surgeon to use the pinky when clamping on tissue, thereby reducing the force on the other fingers.
- Each access ring 35 and 36 includes a soft-touch surface on the interior and exterior surfaces whether by inserting fingers into the access rings or palming the access rings. This feature allows a greater number of hand sizes to comfortably use the device.
- access rings 35 and 36 define a length L.
- the center of gravity of the surgical instrument 100 in combination with the transducer 50 is positioned within length L, more preferably within length L 1 , and most preferably within length L 2 . This position of the center of gravity allows the instrument to balance within the surgeon's hand to provide more precise control of the instrument and eliminate hand fatigue during procedures.
- the torque wrench includes a hand wrench 500 and an adaptor 550 .
- hand wrench 500 is provided with cantilever arms 501 disposed in an annular fashion about the centerline of hand wrench 500 .
- Cantilever arms 501 include teeth 501 a disposed, in one embodiment, in an inward perpendicular fashion in relation to cantilever arms 501 .
- Teeth 501 a in one embodiment of the current invention, are disposed with a cam ramp 501 b at a 25° angle with respect to the perpendicular angle between arm 501 and teeth 501 a .
- Lumen 502 extends the entire length of hand wrench 500 for accepting adaptor 550 .
- Adaptor 550 has a longitudinal shaft 552 with cantilevered tabs 554 at its distal end. At the proximal end of shaft 552 are spline gears 556 projecting in a perpendicular fashion along the outer circumference of shaft 552 .
- Spline gears 556 include cam ramps 556 a disposed at an angle from about 23° to about 28° with respect to the perpendicular angle between the outer circumference of shaft 552 and spline gears 556 .
- Shaft 552 further defines a lateral opening (not shown) proximal to spline gears 556 for accepting curved blade 79 , discussed below.
- Adaptor further includes an interface 560 rigidly connected to shaft 552 and defining an opening for rigidly engaging the distal end of instrument 19 .
- a skirt 558 surrounds spline gears 556 to prevent glove snags due to moving parts and forms a cavity 559 .
- torque wrench opening 502 is aligned with shaft 552 and guided along substantially the entire length of shaft 552 until the tabs 554 flex inward and capture shoulder 505 (not shown) at the distal end of hand wrench 500 .
- Hand wrench lip 503 engages the distal end of optional skirt 558 allowing cantilever teeth 501 a to slidably engage spline gears 556 .
- Cam ramp 501 b slidably engages retainer cam ramps 29 b .
- the torque wrench assembly 450 slidably engages the distal end of instrument 19 and is held rigidly in place.
- Flat surfaces 560 b and 560 a of interface 560 mate with flat surfaces 565 b ( FIG.
- Clockwise annular motion or torque is imparted to hand wrench 500 through paddles 504 .
- the torque is transmitted through arms 501 and teeth 501 a to gears 556 , which in turn transmit the torque to the waveguide 80 via clamp arm assembly 60 via outer shroud 72 via insulated pin 27 .
- the ramps 501 b and 556 cause the arms 501 to move or flex away from the centerline of wrench 500 ensuring that the user does not over-tighten the waveguide 80 onto transducer 50 .
- the torque wrench 450 may be constructed from a durable plastic, such as polycarbonate or a liquid crystal polymer. It is also contemplated that the wrench 450 may alternatively be made from a variety of materials including other plastics, ceramics or metals.
- the paddles and cantilever arm assembly may be separate components attached by mechanical means or chemical means such as adhesives or glue.
- the ultrasonic clamp coagulator apparatus 19 described above will be processed before surgery.
- a new or used ultrasonic clamp coagulator apparatus is obtained and if necessary cleaned.
- the ultrasonic clamp coagulator apparatus can then be sterilized.
- the ultrasonic clamp coagulator apparatus is placed in a closed and sealed container, such as a plastic or TYVEK bag.
- the ultrasonic clamp coagulator apparatus can be bundled in the container as a kit with other components, including a torque wrench 450 .
- the container and ultrasonic clamp coagulator apparatus, as well as any other components, are then placed in a field of radiation that can penetrate the container, such as gamma radiation, x-rays, or high-energy electrons.
- the radiation kills bacteria on the ultrasonic clamp coagulator apparatus and in the container.
- the sterilized ultrasonic clamp coagulator apparatus can then be stored in the sterile container.
- the sealed container keeps the ultrasonic clamp coagulator apparatus sterile until it is opened in the medical facility.
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Abstract
An ultrasonic clamp coagulator assembly that is configured to permit selective cutting, coagulation, and fine dissection required in fine and delicate surgical procedures. The assembly includes a clamping mechanism, including a clamp arm cam-mounted at the distal portion of the instrument, which is specifically configured to create a desired level of tissue clamping forces. The balanced blade provides a functional asymmetry for improved visibility at the blade tip and a multitude of edges and surfaces, designed to provide a multitude of tissue effects: clamped coagulation, clamped cutting, grasping, back-cutting, dissection, spot coagulation, tip penetration and tip scoring. The assembly also features hand activation configured to provide an ergonomical grip and operation for the surgeon. Hand switches are placed in the range of the natural axial motion of the user's index or middle fingers, whether gripping the surgical instrument right-handed or left handed.
Description
- The present application claims the priority benefit of U.S. provisional patent application Ser. No. 60/726,625, filed on Oct. 14, 2005.
- The present invention generally relates to ultrasonic surgical systems and, more particularly, to an ultrasonic device that is optimized to allow surgeons to perform cutting, coagulation, and fine dissection required in fine and delicate surgical procedures such as a thyroidectomy.
- Ultrasonic surgical instruments are finding increasingly widespread applications in surgical procedures by virtue of the unique performance characteristics of such instruments. Depending upon specific instrument configurations and operational parameters, ultrasonic surgical instruments can provide substantially simultaneous cutting of tissue and homeostasis by coagulation, desirably minimizing patient trauma. The cutting action is typically effected by an end-effector at the distal end of the instrument, which transmits ultrasonic energy to tissue brought into contact with the end-effector. Ultrasonic instruments of this nature can be configured for open surgical use, laparoscopic or endoscopic surgical procedures including robotic-assisted procedures.
- Ultrasonic surgical instruments have been developed that include a clamp mechanism to press tissue against the blade of the end-effector in order to couple ultrasonic energy to the tissue of a patient. Such an arrangement (sometimes referred to as a clamp coagulator shears or an ultrasonic transector) is disclosed in U.S. Pat. Nos. 5,322,055; 5,873,873 and 6,325,811. The surgeon activates the clamp arm to press the clamp pad against the blade by squeezing on the handgrip or handle.
- Some current designs of clamp coagulator shears utilize a foot pedal to energize the surgical instrument. The surgeon operates the foot pedal while simultaneously applying pressure to the handle to press tissue between the jaw and blade to activate a generator that provides energy that is transmitted to the cutting blade for cutting and coagulating tissue. Key drawbacks with this type of instrument activation include the loss of focus on the surgical field while the surgeon searches for the foot pedal, the foot pedal getting in the way of the surgeon's movement during a procedure and surgeon leg fatigue during long cases.
- Various methods have been disclosed for curved end effector balancing, which include repositioning the mass along the end effector. The drawbacks of such methods are i) high stresses in the curved region, which makes the end effector more prone to fracture if it comes in contact with metal during surgery; ii) a shorter active length, which limits the vessel size that can be operated on, (the active length is defined as the length from the distal end of the blade to where the displacement is one half of the displacement at its distal end); and/or iii) the inability to separately balance orthogonal displacements.
- Some current designs of clamp coagulator shears. utilize handles that are either of a pistol or scissors grips design. The scissor grip designs may have one thumb or finger grip that is immovable and fixed to the housing and one movable thumb or finger grip. This type of grip may not be entirely familiar to surgeons who use other open-type surgical instruments, such as hemostats, where both thumb and finger grips move in opposition to one another. Current designs have scissor arms that rotate around a fixed pivot or rotation point that is perpendicular to the longitudinal axis of the working element. This approach is limited since the relative motion between the two arms is completely rotational. This feature limits the ability to control the pressure profile between the two working ends when fully closed.
- Some current designs of clamp coagulator shears are not specifically designed for delicate procedures where precise dissection, cutting and coagulation are required. An exemplary procedure is a thyroidectomy where precise dissection, cutting and coagulation is required to avoid critical blood vessels and nerve bundles.
- It would be desirable to provide an ultrasonic surgical instrument that overcomes some of the deficiencies of current instruments. The ultrasonic surgical instrument described herein overcomes those deficiencies.
- An ultrasonic clamp coagulator assembly embodying the principles of the present invention is configured to permit selective dissection, cutting, coagulation and clamping of tissue during surgical procedures.
- A first expression of a first embodiment of the invention is for an ultrasonic waveguide including an ultrasonically actuated blade attached to the distal end of the waveguide; a tissue pad having a tissue engaging surface having a first width and a second width less than the first width; and a clamp member defining a distal portion and a proximal portion and moveable with respect to the blade and having an open position in which at least a portion of the clamp member is spaced from the blade and a closed position in which the clamp member is adjacent to the blade for clamping tissue between the tissue pad and the blade.
- A second expression of a first embodiment includes a clamp member defining a first dimension and a second dimension in a first plane and the first dimension is greater than the second dimension and further defining a first dimension and a second dimension in a second plane and the first dimension is greater than the second dimension.
- A first expression of a third embodiment includes a method of assembling a sterilized ultrasonic clamp coagulator apparatus including the steps of providing an ultrasonic waveguide having a proximal end and a distal end and an ultrasonically actuated blade attached to the distal end of the waveguide; a tissue pad having a flange and a tissue engaging surface having a first width and a second width less than the first width; a clamp member moveable with respect to said end-effector and having an open position in which at least a portion of the clamp member is spaced from the blade and a closed position in which the clamp member is adjacent to the blade for clamping tissue between the tissue pad and the blade, and where the clamp member includes a slot for slidably receiving the flange and slidably engaging the flange within the slot and then sterilizing the clamp coagulator apparatus.
- A first expression of a fourth embodiment of an ultrasonic surgical instrument is for a housing configured to accept a transducer and further defining a longitudinal axis; a first switch positioned on the housing for actuation by one or more fingers of a user in a direction parallel to the longitudinal axis and further electrically connected to a generator for providing an electrical signal to the generator for controlling a first level of ultrasonic energy delivered by the transducer.
- A second expression of a fourth embodiment of an ultrasonic surgical instrument is for a second switch positioned on the housing for actuation by one or more fingers of a user in a direction parallel to the longitudinal axis and further electrically connected to a generator for providing an electrical signal to the generator for controlling a second level of ultrasonic energy delivered by the transducer.
- A first expression of a fifth embodiment of an ultrasonic surgical instrument is for an ultrasonic waveguide defining a longitudinal axis, having a proximal end, a most distal node and a distal end and an ultrasonically actuated blade positioned at the distal end of the waveguide and which defines a functional asymmetry within a first plane, a first balance asymmetry distal to the most distal node and proximal to the blade; and a second balance asymmetry proximal to the most distal node.
- A first expression of a sixth embodiment of an ultrasonic surgical instrument is for a housing, an outer shroud having a proximal end joined to the housing, an ultrasonic waveguide positioned within the outer tube, an ultrasonically actuated blade positioned at the distal end of the waveguide, and an actuating lever for operating a clamp arm located at the distal end of the lever. The actuating lever has camming members, which operatively engage the outer tube such that movement of the actuating lever positions the clamp arm between open and clamped positions relative to the blade.
- A second expression of a sixth embodiment of an ultrasonic instrument is for stationary finger ring that defines an opening having a length L and the housing and a transducer are sized to position a center of gravity of the surgical instrument at the housing within the dimension of length L.
- A first expression of a first embodiment of a torque wrench for use with an ultrasonic clamp coagulator apparatus is for a hand wrench body, a cantilever arm movably attached to said wrench body, at least one tooth located at the cantilever arm's distal end, and an adaptor rotatably attached to the hand wrench and comprising a cam for operatively engaging the tooth.
- The novel features of the invention are set forth with particularity in the appended claims. The invention itself, however, both as to organization and methods of operation, may best be understood by reference to the following description, taken in conjunction with the accompanying drawings in which:
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FIG. 1 is a perspective view illustrating an embodiment of an ultrasonic surgical instrument in accordance with the present invention; -
FIG. 2 is a perspective assembly view ofFIG. 1 ; -
FIG. 3A is a perspective view of one embodiment of a waveguide and blade in accordance with the present invention; -
FIG. 3B is an elevation view of the waveguide and blade ofFIG. 3A ; -
FIG. 3C is an elevation view of an alternate embodiment of a waveguide and blade in accordance with the present invention; -
FIG. 3D is an elevation view of an alternate embodiment of a waveguide and blade in accordance with the present invention; -
FIG. 3E is an elevation view of an alternate embodiment of a waveguide and blade in accordance with the present invention; -
FIG. 3F is an alternate view of the embodiment of the waveguide and blade ofFIG. 3E ; -
FIG. 3G is an elevation view of an alternate embodiment of a waveguide and blade in accordance with the present invention; -
FIG. 4 is a graph illustrating the displacement profile of the present invention and the prior art; -
FIG. 5 is a graph illustrating an alternate displacement profile of the present invention and the prior art; -
FIG. 6A is an elevation view of the waveguide and blade of FIGS. 3E-F illustrating one embodiment of the radius of curvature of the blade; -
FIG. 6B is an exploded view of one embodiment of the blade ofFIG. 6A and a radius cut; -
FIG. 6C is an alternate view of the embodiment ofFIG. 6A ; -
FIG. 6D is a section view of the embodiment ofFIG. 6B ; -
FIG. 7A is an elevation view of an end effector in accordance with the present invention; -
FIG. 7B is a plan view of the end effector ofFIG. 7A ; -
FIG. 8 is a perspective view from proximal to distal end of a clamp member in accordance with the present invention; -
FIG. 9A is a plan view of a tissue pad in accordance with the present invention; -
FIG. 9B is a plan view of the opposite face of the tissue pad ofFIG. 9A ; -
FIG. 9C is an elevation view the tissue pad of FIGS. 9A-B; -
FIG. 10A is a perspective view of an alternate expression of the clamp member; -
FIG. 10B is a perspective view of the clamp member ofFIG. 10A and a first tissue pad; -
FIG. 10C is a perspective view of the clamp member ofFIG. 10A and a first and second tissue pad; -
FIG. 11A -B are an alternate expressions for a first and second tissue pad; -
FIG. 11C is a perspective view of an alternate expression of a clamp arm for use with the tissue pads of FIGS. 11A-B; -
FIG. 11D is an alternate view of the clamp are ofFIG. 11C ; -
FIG. 11E is a cut-away view of an assembled clamp arm and tissue pad assembly of FIGS. 11A-D -
FIG. 12A is a perspective view of an alternate embodiment of a clamp arm having a distal connection point; -
FIG. 12B is a perspective view of an alternate embodiment of a tissue pad having a distal connection member; -
FIG. 12C is a perspective view of an assembled clamp arm and tissue pad of FIGS. 12A-B; -
FIG. 13 is a partial view of the distal end of the ultrasonic instrument in accordance with the present invention; -
FIG. 14 is an exploded elevation view of one part of the clamp arm and clamp member and cam members; -
FIG. 15 is an exploded view of the outer shroud and cam slots; -
FIG. 16A is an elevation view of an ultrasonic instrument and pushbutton assembly in accordance with the present invention; -
FIG. 16B is an elevation view of the two piece assembly of a push button in accordance with the present invention; -
FIG. 16C is a cut-away elevation view showing the interface among the switch housing, transducer, waveguide and housing; -
FIG. 16D is a perspective elevation view of a switch housing in accordance with the present invention; -
FIG. 16E is an alternate view of the switch housing ofFIG. 16D ; -
FIG. 16F is a view of a flex circuit in accordance with the present invention; -
FIG. 16G is an electrical schematic of the hand switch circuit; -
FIG. 17A is an elevation view of an ultrasonic instrument in accordance with the present invention as may be grasped by a user; -
FIG. 17B is an exploded view of the finger and thumb interface of a ultrasonic instrument in accordance with the present invention; -
FIG. 18 is an elevation view of an ultrasonic instrument in accordance with the present invention as may be grasped by a user and defining a center of gravity; -
FIG. 19A is a perspective view of a two-piece torque wrench in accordance with the present invention; -
FIG. 19B is a perspective view of a hand wrench in accordance with the present invention; -
FIG. 19C is an elevation view of the hand wrench ofFIG. 19B ; -
FIG. 19D is a cross sectional end view of the distal end of a hand wrench depicting cantilever arm and teeth geometry; -
FIG. 19E is a cross sectional view of an adaptor depicting spline gear geometry; -
FIG. 19F is a perspective view of an adaptor for use with a hand wrench in accordance with the present invention; and -
FIG. 19G is a partial perspective view of a hand wrench interfacing with an ultrasonic instrument in accordance with the present invention. - Before explaining the present invention in detail, it should be noted that the invention is not limited in its application or use to the details of construction and arrangement of parts illustrated in the accompanying drawings and description. The illustrative embodiments of the invention may be implemented or incorporated in other embodiments, variations and modifications, and may be practiced or carried out in various ways. Further, unless otherwise indicated, the terms and expressions employed herein have been chosen for the purpose of describing the illustrative embodiments of the present invention for the convenience of the reader and are not for the purpose of limiting the invention.
- Further, it is understood that any one or more of the following-described embodiments, expressions of embodiments, examples, etc. can be combined with any one or more of the other following-described embodiments, expressions of embodiments, examples, etc.
- The present invention is particularly directed to an improved ultrasonic surgical clamp coagulator apparatus which is configured for effecting tissue cutting, coagulation, and/or clamping during surgical procedures, including delicate surgical procedures, such as a thyroidectomy. The present apparatus is configured for use in open surgical procedures. Versatile use is facilitated by selective use of ultrasonic energy. When ultrasonic components of the apparatus are inactive, tissue can be readily gripped and manipulated, as desired, without tissue cutting or damage. When the ultrasonic components are activated, the apparatus permits tissue to be gripped for coupling with the ultrasonic energy to effect tissue coagulation, with application of increased pressure efficiently effecting tissue cutting and coagulation. If desired, ultrasonic energy can be applied to tissue without use of the clamping mechanism of the apparatus by appropriate manipulation of the ultrasonic blade.
- As will become apparent from the following description, the present clamp coagulator apparatus is particularly configured for disposable use by virtue of its straightforward construction. As such, it is contemplated that the apparatus be used in association with an ultrasonic generator unit of a surgical system, whereby ultrasonic energy from the generator unit provides the desired ultrasonic actuation for the present clamp coagulator apparatus. It will be appreciated that a clamp coagulator apparatus embodying the principles of the present invention can be configured for non-disposable or multiple use, and non-detachably integrated with an associated ultrasonic generator unit. However, detachable connection of the present clamp coagulator apparatus with an associated ultrasonic generator u nit is presently preferred for single-patient use of the apparatus.
- With specific reference now to
FIGS. 1 and 2 , an embodiment of asurgical system 19, including an ultrasonicsurgical instrument 100 in accordance with the present invention is illustrated. Thesurgical system 19 includes anultrasonic generator 30 connected to anultrasonic transducer 50 viacable 22, and an ultrasonicsurgical instrument 100. It will be noted that, in some applications, theultrasonic transducer 50 is referred to as a “hand piece assembly” because the surgical instrument of thesurgical system 19 is configured such that a surgeon may grasp and manipulate theultrasonic transducer 50 during various procedures and operations. A suitable generator is the GEN04 (also referred to as Generator 300) sold by Ethicon Endo-Surgery, Inc. of Cincinnati, Ohio. A suitable transducer is disclosed in co-pending U.S. patent application filed on Oct. 10, 2006, Ser. No. ______ (Attorney Docket# END5747USNP1), entitled MEDICAL ULTRASOUND SYSTEM AND HANDPIECE AND METHODS FOR MAKING AND TUNING, the contents which are incorporated by reference herein. -
Ultrasonic transducer 50, and anultrasonic waveguide 80 together provide an acoustic assembly of the presentsurgical system 19, with the acoustic assembly providing ultrasonic energy for surgical procedures when powered bygenerator 30. The acoustic assembly ofsurgical instrument 100 generally includes a first acoustic portion and a second acoustic portion. In the present embodiment, the first acoustic portion comprises the ultrasonically active portions ofultrasonic transducer 50, and the second acoustic portion comprises the ultrasonically active portions oftransmission assembly 71. Further, in the present embodiment, the distal end of the first acoustic portion is operatively coupled to the proximal end of the second acoustic portion by, for example, a threaded connection. - The ultrasonic
surgical instrument 100 includes amulti-piece handle assembly 68 adapted to isolate the operator from the vibrations of the acoustic assembly contained withintransducer 50. Thehandle assembly 68 can be shaped to be held by a user in a conventional mariner, but it is contemplated that the present ultrasonicsurgical instrument 100 principally be grasped and manipulated in a scissor-like arrangement provided by a handle assembly of the instrument, as will be described. Whilemulti-piece handle assembly 68 is illustrated, thehandle assembly 68 may comprise a single or unitary component. The proximal end of the ultrasonicsurgical instrument 100 receives and is fitted to the distal end of theultrasonic transducer 50 by insertion of the transducer into thehandle assembly 68. The ultrasonicsurgical instrument 100 may be attached to and removed from theultrasonic transducer 50 as a unit. The ultrasonicsurgical instrument 100 may include ahandle assembly 68, comprisingmating housing portions ultrasonic transmission assembly 71. Theelongated transmission assembly 71 of the ultrasonicsurgical instrument 100 extends orthogonally from theinstrument handle assembly 68. - The
handle assembly 68 may be constructed from a durable plastic, such as polycarbonate or a liquid crystal polymer. It is also contemplated that thehandle assembly 68 may alternatively be made from a variety of materials including other plastics, ceramics or metals. Traditional unfilled thermoplastics, however, have a thermal conductivity of only about 0.20 W/m° K. (Watt/meter-° Kelvin). In order to improve heat dissipation from the instrument, the handle assembly may be constructed from heat conducting thermoplastics, such as high heat resistant resins liquid crystal polymer (LCP), Polyphenylene Sulfide (PPS), Polyetheretherketone (PEEK) and Polysulfone having thermal conductivity in the range of 20-100 W/m° K. PEEK resin is a thermoplastics filled with aluminum nitride or boron nitride, which are not electrically conductive. The thermally conductive resin helps to manage the heat within smaller instruments. - The
transmission assembly 71 includes awaveguide 80 and ablade 79. It will be noted that, in some applications, the transmission assembly is sometimes referred to as a “blade assembly”. Thewaveguide 80, which is adapted to transmit ultrasonic energy fromtransducer 50 to the tip ofblade 79 may be flexible, semi-flexible or rigid. Thewaveguide 80 may also be configured to amplify the mechanical vibrations transmitted through thewaveguide 80 to theblade 79 as is well known in the art. Thewaveguide 80 may further have features to control the gain of the longitudinal vibration along thewaveguide 80 and features to tune thewaveguide 80 to the resonant frequency of the system. In particular,waveguide 80 may have any suitable cross-sectional dimension. For example, thewaveguide 80 may have a substantially uniform cross-section or thewaveguide 80 may be tapered at various sections or may be tapered along its entire length. -
Ultrasonic waveguide 80 may, for example, have a length substantially equal to an integral number of one-half system wavelengths (nλ/2). Theultrasonic waveguide 80 andblade 79 may be preferably fabricated from a solid core shaft constructed out of material, which propagates ultrasonic energy efficiently, such as titanium alloy (i.e., Ti-6Al-4V), aluminum alloys, sapphire, stainless steel or any other acoustically compatible material. -
Ultrasonic waveguide 80 may further include at least one radial hole oraperture 66 extending therethrough, substantially perpendicular to the longitudinal axis of thewaveguide 80. Theaperture 66, which may be positioned at a node, is configured to receive a connector pin 27, discussed below, which connects thewaveguide 80, to thehandle assembly 70. -
Blade 79 may be integral with thewaveguide 80 and formed as a single unit. In an alternate expression of the current embodiment,blade 79 may be connected by a threaded connection, a welded joint, or other coupling mechanisms. The distal end of theblade 79 is disposed near an anti-node 85 in order to tune the acoustic assembly to a preferred resonant frequency fo when the acoustic assembly is not loaded by tissue. Whenultrasonic transducer 50 is energized, the distal end ofblade 79 orblade tip 79 a is configured to move substantially longitudinally (along the x axis) in the range of, for example, approximately 10 to 500 microns peak-to-peak, and preferably in the range of about 20 to about 200 microns at a predetermined vibrational frequency fo of, for example, 55,500 Hz.Blade tip 79 a also preferably vibrates in the y axis at about 1 to about 10 percent of the motion in the x axis. - The
blade tip 79 a provides a functional asymmetry or curved portion for improved visibility at the blade tip so that a surgeon can verify that theblade 79 extends across the structure being cut or coagulated. This is especially important in verifying margins for large blood vessels. The geometry also provides for improved tissue access by more closely replicating the curvature of biological structures.Blade 79 provides a multitude of edges and surfaces, designed to provide a multitude of tissue effects: clamped coagulation, clamped cutting, grasping, back-cutting, dissection, spot coagulation, tip penetration and tip scoring. -
Blade tip 79 a is commonly referred to as a functional asymmetry. That is, the blade (functionally, the blade provides a multitude of tissue effects) lies outside the longitudinal axis of waveguide 80 (that is, asymmetrical with the longitudinal axis), and accordingly creates an imbalance in the ultrasonic waveguide. If the imbalance is not corrected, then undesirable heat, noise, and compromised tissue effect occur. - It is possible to minimize unwanted tip excursion in the y and z axes, and therefore maximize efficiency with improved tissue effect, by providing one or more balance asymmetries or balancing features proximal to the blade functional asymmetry.
- Referring now to FIGS. 3A-G,
transmission assembly 71 includes one or more balancing features placed atblade 79, at a position proximal and/or distal to the distalmost node 84. In addition, the balancing features at thewaveguide 80 are shaped to balance the two orthogonal modes in the y and z axes, separately. The size and shape and location of the balance features allow flexibility to reduce stress at theblade 79, make the active length longer and separately balance the two orthogonal modes. - FIGS. 3A-B show a single balance cut 82 at the
waveguide 80 distal tonode 84. In this embodiment balance cut 82 has side walls perpendicular to the longitudinal axis ofwaveguide 80 and the bottom cut is parallel to the longitudinal axis ofwaveguide 80. In this embodiment the high stresses experienced during operation are localized at the balancing cut 82, which is away from the more sensitive curved region at theblade 79. -
FIG. 3C shows two balancing features 82 and 82 a, one distal and one proximal to thenode 84. Adding second balance cut 82 a, proximal tonode 84 further eliminates the orthogonal bending modes thereby providing a more pure longitudinal motion (x direction) and removing the overlapping bending modes (y and z direction). Accordingly, theblade 79 is better balanced and has a longer active length. -
FIG. 3D shows two balancing features 82 c and 82 a, distal and proximal to thenode 84. An angled bottom cut atbalance feature 82 c allows individual balancing of the bending mode in the z direction. - FIGS. 3E-F show two balancing features 82 and 82 d, distal and proximal to the
node 84. The side walls ofbalance feature 82 d are angled with respect to each other in the x-z plane and provide for individual balancing of the bending mode in the y direction. The angled side walls define an, included angle ? of between 1° and about 90°, preferably between about 15° and about 25°, and more preferably between about 19° and about 21°. The weight removed at each balance feature is a function of multiple parameters including the radius of curvature atblade tip 79 a and the desired level of removal of the overlapping bending modes in the y and z direction. In an illustrative example, the balance cut 82 represents a weight reduction of about 0.003 to about 0.004 oz., and most preferably about 0.0034 oz. The balance cut 82 d represents a weight reduction of about 0.004 to about 0.005 oz., and most preferably about 0.0043 oz. -
FIG. 3G shows one balance cut 82 e in the curved blade region in addition tobalance feature 82, distal tonode 84. Balance cut 82 e allows for balancing as well as improved acoustic performance as a result of wide frequency separation of transverse modes from the fundamental frequency, which is the longitudinal mode frequency. - As would be apparent to one skilled in the art, any combination of
balance cuts 82 through 82 e are possible to provide balancing of a waveguide and curved blade. -
FIG. 4 shows that the profile produced by the balancing cut features ofFIG. 3E produces a 1.3 mm longer active length along the longitudinal displacement direction than is available from an LCS-C5 ultrasonic clamp coagulator, sold by Ethicon Endo-Surgery, Inc. (where the y axis is representative of the ratio between the displacement anywhere alongblade tip 79 a and the displacement at the most distal end ofblade tip 79 a). A longer active length is desirable for cutting and coagulating large vessels, for example, 5-7 mm vessels. -
FIG. 5 shows that the profile produced by the balancing features ofFIG. 3E produces a 2.5 mm longer active length (along the vector sum of displacements in the x, y and z directions) than is available from an LCS-C5 ultrasonic clamp coagulator, which is desirable for cutting and coagulating large vessels, for example, 5-7 mm vessels. - Referring back to
FIGS. 1 and 2 an outer tubular member orouter shroud 72 attaches to the most proximal end ofhandle assembly 70. Attached to the distal end of theouter shroud 72 is adistal shroud 76. Both theouter shroud 72 anddistal shroud 76 may attach via a snap fit, press fit, glue or other mechanical means. Extending distally from thedistal shroud 76 is the end-effector 81, which comprises theblade 79 andclamp member 56, also commonly referred to as a jaw, in combination with one ormore tissue pads 58. Aseal 83 may be provided at thedistal-most node 84, nearest the end-effector 81, to abate passage of tissue, blood, and other material in the region between thewaveguide 80 and thedistal shroud 76.Seal 83 may be of any known construction, such as an o-ring or silicon overmolded atnode 84. - Referring now to FIGS. 6A-D and 7A-B,
blade 79 is curved along with the associatedclamp member 56. This is illustrative only, andblade 79 and acorresponding clamp member 56 may be of any shape as is known to the skilled artisan. One benefit of the invention, however, is the ability to perform finer, more delicate surgical procedures. It is also multifunctional and able to dissect tissue as well as coagulate and transect. - The ability to finely dissect is enabled primarily by the tapering of the
end effector 81. The end effector is tapered in two planes, which mimics typical hemostats. This allows the user to create windows in the tissue and then spread the tissue apart more easily. Theblade 79 andclamp member 56 are tapered in both the x and z directions from the proximal end to the distal end. Thepad 58 is only tapered in the Z direction. That is, theclamp pad 58 has a constant thickness, but the width of theclamp pad 58 at the distal end is less than the width at the proximal end. Accordingly, the surface area of section A is greater than the surface area of section B. - In addition to the taper, the radius at the distal end of the
blade 79 andclamp member 56 also promotes fine dissection. The radius at the tip of theclamp member 56 is approximately 0.040 inches, and the blade radius is approximately 0.045 inches. - With specific reference to
FIG. 6A ,blade 79 is defined by an inside radius R1 and an outside radius R2 measured at a distance D1 from the longitundinal axis. The dimensions R1, R2 and D1 are selected in combination with the balance cuts previously discussed. In one embodiment R1 is from about 0.80 inches to about 1.00 inches and most preferably about 0.95 inches; R2 is from about 0.90 inches to about 1.10 inches and most preferably about 1.04 inches; and D1 is from about 0.90 inches to about 1.10 inches and most preferably about 0.99 inches. -
FIGS. 6B and 6D further illustrate a second expression of theblade 79. Illustrated is a radius cut 90 inblade 79 to provide two back cuttingedges 92 and 92 a. As will be appreciated by the skilled artisian, radius cut 90 also provides a balance asymmetry within the functional symmetry to help balance the orthogonal modes. Theback cutting edges 92 and 92 a are positioned opposite the clamp pad 58 (FIG. 7B ) to allow the surgeon to perform tissue cutting procedures without the assistance of theclamp pad 58. Preferably, the radius cut is distal to the most distal tip ofblade 79 to allow for a blunt radius tip for tissue dissection as discussed above. In one example of the second expression ofblade 79, a radius cut R3 is swept across an angle F measured at a distance D2 from the longitudinal axis and starting a distance D3 from the distal tip ofblade 79. In one embodiment R3 is from about 0.030 inches to about 0.060 inches and most preferably about 0.050 inches; angle F is from about 20° to about 35° and most preferably about 30°; D2 is about 0.90 inches to about 1.10 inches and most preferably about 0.99 inches; and D3 is from about 0.085 inches to about 0.11 inches and most preferably about 0.09 inches. - In a third expression of
blade 79,FIG. 6C illustrates a taper defined by angle O relative to an axis parallel to the longitudinal axis ofwaveguide 80 from the proximal end ofblade 79 to the distal end ofblade 79. In one embodiment the taper may be on the blade surface that contacts tissue pad 58 (FIG. 7A ). Alternatively, the taper may be the defined by the opposite surface comprising radius cut 90. Referring toFIG. 6C , angle O ranges from about 0.5° to about 5°, and preferably from about 1.5° to about 2°. - Referring back to
FIG. 2 ,waveguide 80 is positioned withincavity 59 ofhandle assembly 68. In order to properly locate thewaveguide 80 both axially and radially, pin 27 extends through opening 66 of waveguide 80 (located at a node) and engages channel 28 (formed by the mating ofhousing portions 69 and 70). Preferably pin 27 is made of any compatible metal, such as stainless steel or titanium or a durable plastic, such as polycarbonate or a liquid crystal polymer. In a first expression of one embodiment, pin 27 is partially coated with an elasto-meric material 30, such as silicon for that portion 29 of pin 27 that extends throughwaveguide 80 and uncoated for that portion of pin 27 that engagesmembers hole 66. This enables high efficiency operation whereby minimal overheating is generated and maximum ultrasonic output power is available at the blade tip for cutting and coagulation. The lack of insulation allows pin 27 to be held firmly withinhandle assembly 68 due to the lack of insulation, which would provide deformation and movement if pin 27 were completely coated with an insulating material. - Referring now to
FIGS. 8 and 9 A-C a first expression ofclamp member 56 has a shapedslot 57 for accepting one or more tissue pads. This configuration prevents mis-loading of the tissue pads and assures that the appropriate pad is loaded at the correct location withinclamp member 56. Forexample clamp member 56 may comprise a T-shapedslot 57 to accept a T-shapedflange 55 ofclamp pad 58. Twomechanical stops clamp pad 58 to secure the clamp pad withinclamp member 56. As would be appreciated by those skilled in the art, flanges and corresponding slots may have alternate shapes and sizes to secure the clamp pads to the clamp arm. The illustrated flange configurations shown are exemplary only and accommodate the particular clamp pad material of one embodiment, but the particular size and shape of the flange may vary, including, but not limited to, flanges of the same size and shape. For unitary tissue pads, the flange may be of one configuration. Further, other tab stops are possible and may include any of the multiple methods of mechanically attaching the clamp pads to the clamp arm, such as rivets, glue, press fit or any other fastening means well know to the artisan. - Referring to FIGS. 10A-C, in a first expression of an alternate embodiment,
clamp pad 58 consists of afirst tissue pad 58 b and asecond pad portion 58 a, which may be an insert withinpad 58 b.Tissue pad 58 b may comprise a tissue engaging surface having saw tooth-like teeth andproximal portion 58 a may have a smoother surface relative to pad 58 b. The advantage of twoseparate components blade 79. - In a second expression of an alternate embodiment of the present invention,
clamp pad 58 b is formed from TEFLON® or any other suitable low-friction material.Clamp pad 58 a is formed from a base material and at least one filler material, which is a different material from the base material. The surface ofproximal clamp pad 58 a may be smoother thandistal clamp pad 58 b, orproximal clamp pad 58 a may also have a similar type saw-tooth configuration. - Several benefits and advantages are obtained from one or more of the expressions of the invention. Having a tissue pad with a base material and at-least-one filler material allows the base material and the at-least-one filler material to be chosen with a different hardness, stiffness, lubricity, dynamic coefficient of friction, heat transfer coefficient, abradability, heat deflection temperature, glass transition temperature and/or melt temperature to improve the wearability of the tissue pad, which is important when high clamping forces are employed because tissue pads wear faster at higher clamping forces than at lower clamping forces. In experiments, a 15% graphite-filled polytetrafluoroethylene tissue pad showed substantially the same wear with a 7 pound clamping force as a 100% polytetrafluoroethylene tissue pad showed with a 1.5 pound clamping force. Having a flexible clamping arm and/or a flexible tissue pad should also improve the wearability of the tissue pad due to the ability of the flexible member to more evenly distribute the load across the entire surface of the tissue pad. Further benefits and expressions of this embodiment are disclosed in U.S. provisional patent application, Ser. No. 60/548,301, filed on Feb. 27, 2004 and commonly assigned to the assignee of the present application.
- In a third expression of an alternate embodiment, a tissue pad with a base material and at least two filler materials allows the base material and the at-least-two filler materials to be chosen with a different hardness, stiffness, lubricity, dynamic coefficient of friction, heat transfer coefficient, abradability, heat deflection temperature, and/or melt temperature to improve the wearability of the tissue pad, which is important when high clamping forces are employed because tissue pads wear faster at higher clamping forces than at lower clamping forces. In experiments, a 15% graphite-filled, 30% PTFE-filled polyimide tissue pad showed substantially the same or better wear with a 4.5 pound clamping force as a 100% polytetrafluoroethylene tissue pad showed with a 1.5 pound clamping force. The advantage of a 15% graphite-filled, 30% PTFE-filled polyimide tissue pad is increased heat resistance, which improves the overall wear resistance of the tissue pad. This polyimide-composite clamp pad has a useful heat resistance up about 800° F. to about 1200° F., as compared to a useful heat resistance up to about 660° F. of a PTFE clamp pad. Alternatively, Other materials are also useful for a portion of the tissue pad, such as ceramics, metals, glasses and graphite.
- FIGS. 10A-C disclose a first expression of an embodiment of attaching a two
part clamp pad 58 a-b to aclamp member 56. InFIG. 10A , at least twoslots flanges slot 57 a accepts a corresponding T-flange 55 a ofclamp pad 58 a, and wedge-shapedslot 57′ accepts a corresponding wedge-shaped shapedflange 55′ ofclamp pad 58 b. - FIGS. 11A-E illustrate a second expression of attaching a
clamp pad 58 c to aclamp arm 56 c.Clamp pad 58 c comprises one ormore protrusions 62 for insertion into one or morecorresponding apertures 63 inclamp arm 56 c. If a second or more clamp pad(s) 58 d is also used in accordance with the previous discussion, then clamppad 58 c further comprises correspondingaperture 61 for accepting one or more clamp pad(s) 58 d.Clamp arm 56 c has corresponding aperture(s) 63 for acceptingprotrusions 62, as well as a correspondingcavity 64 for accepting the one ormore clamp pad 58 d.FIG. 11E illustrates the components assembled together prior to staking.Clamp pad 58 d fits inside theaperture 61 andcavity 64, and pad 58 c is aligned withclamp arm 56 c so thatprotrusions 62 align withchamfered aperture 63.Protrusions 62 have additional height beyond the top surface ofclamp arm 56 c to provide additional material to fill the chamfered volume during staking. Heat is applied toprotrusions 62 above theclamp arm 56 c; the protrusions deform and take the shape of the chamfered volume. - FIGS. 12A-C illustrate a third expression of attaching a
clamp pad 58 d to aclamp arm 56 d. In addition to a T-shapedflange 55,clamp pad 58 d further comprises a hook-like protrusion orclip 65 for attaching to acorresponding opening 66 at the distal tip ofclamp arm 56 d. In this expression, the distal tip ofclamp arm 56 d is open and theclamp pad 58 d is inserted from the distal to proximal direction until the hook clip engagesopening 66.Hook clip 65 may be biased closed so whenclip 65 engagesopening 66,clip 65 applies compressive forces againstopening 66. - A first expression for a method for inserting a clamp pad on a clamp arm includes a) inserting a first clamp pad having a first width dimension greater than a second width dimension and having a first-shaped flange into a clamp arm having a slot that accepts the first-shaped flange; and b) engaging a pad stop to secure the clamp pad within the clamp arm. In a second expression of the method, the clamp pad consists of a second clamp pad fabricated from a base material and at least one filler material, which is a different material from the base material. The second clamp pad may have a second-shaped flange for engaging a second-shaped slot on the clamp arm. The tissue surfaces of the clamp pads may be smooth or have tissue gripping features, such as a saw-tooth configuration.
- A first expression for a method for replacing clamp pads would include the steps of: a) disengaging a pad stop; b) removing a first clamp pad from the clamp arm; c) removing a second clamp pad from the clamp arm, wherein at least one of the first or second clamp pads has a first width dimension greater than a second width dimension; d) inserting third and fourth clamp pads into the clamp arm wherein at least one of the third or fourth clamp pads has a first width dimension greater than a second width dimension; and e) engaging a pad stop to secure the third and fourth clamp pads within the clamp arm. In a second expression of this method one of the third and fourth clamp pads may be fabricated from a polymeric material such as TEFLON, and the other clamp pad may be fabricated from a base material and at least one filler material, which is a different material from the base material. The tissue surfaces of the clamp pads may be smooth or have tissue gripping features, such as a saw-tooth configuration.
- Referring to
FIGS. 13-15 , aclamp arm 60 is configured for use with the present ultrasonicsurgical instrument 100 and for cooperative action withblade 79 andclamp member 56. Theclamp arm 60 is rotatably mounted to the distal end ofouter shroud 72, detailed below, and connectably attaches at the distal end of thumb ring oractuation member 34.Clamp pad 58 mounts on theclamp member 56 for cooperation withblade 79, with rotational movement of theclamp arm 60 positioning the clamp pad in substantially parallel relationship to, and in contact with,blade 79, thereby defining a tissue treatment region. By this construction, tissue is grasped betweenclamp pad 58 andblade 79. Pivotal movement of theclamp member 56 with respect toblade 79 is affected by the provision of a pair of camming members on theclamp arm 60 that interface with theouter shroud 72. Theouter shroud 72 is grounded to handle 68. - A first expression of
clamp arm 60 comprises jaw-carryingmember 60 a andmating member 60 b. Jaw-carryingmember 60 a includes twocamming members outer shroud 72.Mating member 60 b includes two camming members 96 a and 96 b for mating with two correspondingcamming slots outer shroud 72.Corresponding camming members 94 a/94 b and 96 a/96 b (and corresponding camming slots 95 a/95 b and 97 a/97 b) may align along common axes perpendicular to the longitudinal axis ofwaveguide 80 or camming members may be offset to facilitate the assembly process.Members FIG. 13 to formclamp arm 60 via press fit or snap fit. Other attaching methods are available as is known to those skilled in the art, such as welding, glue, screwing, etc. Once assembled,clamp arm 60 defines anopening 93 for receivingouter shroud 72 and the interlocking of the respective cam members and cam slots. Alternatively,members outer shroud 72 and all three elements mated together in one operation. One benefit of the cam open and closure mechanism is that it can provide both a rotational motion and linear motion of theclamp arm 60 andclamp member 56 thereby providing better control of the pressure profile betweenclamp pad 58 andblade 79. - In a second expression of
clamp arm 60, the camming members may be replaced with spherical elements that interface with cam slots. Alternatively camming members may be replaced with spherical depressions for receiving ball bearings that interface with the cam slots. Other camming mechanism would be useful as is well known to the skilled artisian. - With solid camming members and corresponding slots, the force delivered between the
clamp pad 58 andblade 79 is directly related to the force that the user applies at thethumb ring 35 andfinger ring 36. In a third expression ofclamp arm 60, aforce limiting element 98, such as an elastomer or coil or leaf spring, may be inserted within one or more cam slots and provide a force limit to the coaptation force seen at theend effector 81. Preferably, the spring constant of an elastomer or spring ranges from 10-500 lb./in. -
Outer shroud 72,distal shroud 76 and clamparm 60 may be constructed from any number of biocompatible materials, such as titanium, stainless steel or plastics. Preferably, however, these elements are constructed of either 7075 or 6061 T6 aluminum. The aluminum provides a large benefit in terms of heat dissipation. Devices of the prior art have sheaths and clamp arms made of stainless steel. Typical values for thermal conductivity for aluminum are around 250 W/m K. The values for stainless steel are around 16 W/m K. Thus, aluminum has approximately 15 times greater capability to transmit heat through the same amount of volume. - The inventors have found through testing of similar inputs (clamp force and blade displacement), the present invention operates approximately 150° F. lower in temperature than instruments of the prior art. The aluminum components more effectively draw the heat away from the pad and the blade, thus keeping the end effector cooler than other prior art instruments.
- Referring now to
FIGS. 1, 2 and 16A-G housing 68 includes a proximal end, a distal end, and acavity 59 extending longitudinally therein.Cavity 59 is configured to accept a switch assembly 300 and thetransducer assembly 50. - In one expression of the current embodiment, the distal end of
transducer 50 threadedly attaches to the proximal end oftransmission rod 80. The distal end oftransducer 50 also interfaces with switch assembly 300 to provide the surgeon with finger-activated controls onsurgical instrument 19. -
Transducer 50 includes a firstconductive ring 400 and a secondconductive ring 410 which are securely disposed within thetransducer body 50 as is described in co-pending application Ser. No. ______ (Attorney docket no. END5747USNP2). - Switch assembly 300 comprises a
pushbutton assembly 310, aflex circuit assembly 330, aswitch housing 350, afirst pin conductor 360 and asecond pin conductor 370.Switch housing 350 is saddle-shaped and is supported withinhandle assembly 68 by way of corresponding supporting mounts onswitch housing 350 andhousing portions Housing 350 defines afirst receiving area 353 for a dome switch, and asecond receiving area 351 for a dome switch. - With particular reference now to
FIG. 16D and E, pins 360 and 370 are electrically connected todome switch conductors transducer 50 at a second end.Pins tip transducer 50 as shown inFIG. 16C . Eachend housing 68 are twotriggers second halves FIG. 16B istrigger 320, which comprisesridges 321 a and b and contact surface 323 (made up ofmating surfaces housing 68 andcontact surfaces 323 and 325 mechanically engagedome switches Ridges Ridges - In a second expression of switch assembly 300 elastomeric connectors having copper traces etched onto the elastomer press fit into
switch housing 350 to provide the electrical interconnect betweentransducer 50 andflex circuit 330. One end of the elastomer connectors electrically engagedome switches conductors conductors transducer 50. Compression of the elastomer connectors allow a working travel of up to 20% of the total height of the elastomer connectors to allow for manufacturing tolerances associated with the stackup of the assembled parts. - A
flex circuit 330 provides for the electromechanical interface betweenpushbuttons generator 30 viatransducer 50. Flex circuit comprises twodome switches pushbuttons generator 30 as shown by the electrical wiring schematic ofFIG. 16G .Flex circuit 330 also comprises two diodes within adiode package 336 and conductors, 335 and 337 as is known to those in the art, that connect topins conductors cable 22 that connect togenerator 30. -
Flex circuit 330 generally sits within a channel 352 ofswitch assembly 350 so that dome switches 332 and 334 interface with the corresponding backing surfaces 351 and 353. Backing surfaces provide a firm support for the dome switches during operation, discussed below. Dome switches 332 and 334 may be fixedly attached to backingsurfaces - As is readily apparent, by depressing
pushbuttons FIG. 16G . When the surgeon depresses 321 pushbutton, the generator will respond with a certain energy level, such as a maximum (“max”) power setting; when the surgeon depressespushbutton 322, the generator will respond with a certain energy level, such as a minimum (“min”) power setting, which conforms to accepted industry practice for pushbutton location and the corresponding power setting. - Referring now to FIGS. 17A-B, the pushbutton axial actuation reduces stress on the surgeon's fingers and allows the fingers to actuate force in a more ergonomic position preventing stresses at the hands and wrists. The switch movement also allows comfortable button activation in less than optimal hand positions, which surgeons often encounter throughout a typical procedure.
- At the proximal end of each
access ring protrusions access ring - Referring to
FIG. 18 , access rings 35 and 36 define a length L. Perferably, the center of gravity of thesurgical instrument 100 in combination with thetransducer 50 is positioned within length L, more preferably within length L1, and most preferably within length L2. This position of the center of gravity allows the instrument to balance within the surgeon's hand to provide more precise control of the instrument and eliminate hand fatigue during procedures. - Referring now to
FIGS. 18 and 19 A-E, a two-piece torque wrench 450 is shown. The torque wrench includes ahand wrench 500 and anadaptor 550. In one embodiment,hand wrench 500 is provided withcantilever arms 501 disposed in an annular fashion about the centerline ofhand wrench 500.Cantilever arms 501 include teeth 501 a disposed, in one embodiment, in an inward perpendicular fashion in relation to cantileverarms 501. Teeth 501 a, in one embodiment of the current invention, are disposed with acam ramp 501 b at a 25° angle with respect to the perpendicular angle betweenarm 501 and teeth 501 a.Lumen 502 extends the entire length ofhand wrench 500 for acceptingadaptor 550. -
Adaptor 550 has alongitudinal shaft 552 withcantilevered tabs 554 at its distal end. At the proximal end ofshaft 552 are spline gears 556 projecting in a perpendicular fashion along the outer circumference ofshaft 552. Spline gears 556 include cam ramps 556 a disposed at an angle from about 23° to about 28° with respect to the perpendicular angle between the outer circumference ofshaft 552 and spline gears 556.Shaft 552 further defines a lateral opening (not shown) proximal to spline gears 556 for acceptingcurved blade 79, discussed below. Adaptor further includes aninterface 560 rigidly connected toshaft 552 and defining an opening for rigidly engaging the distal end ofinstrument 19. Optionally, askirt 558 surrounds spline gears 556 to prevent glove snags due to moving parts and forms acavity 559. - In assembly,
torque wrench opening 502 is aligned withshaft 552 and guided along substantially the entire length ofshaft 552 until thetabs 554 flex inward and capture shoulder 505 (not shown) at the distal end ofhand wrench 500.Hand wrench lip 503 engages the distal end ofoptional skirt 558 allowing cantilever teeth 501 a to slidably engage spline gears 556.Cam ramp 501 b slidably engages retainer cam ramps 29 b. Thetorque wrench assembly 450 slidably engages the distal end ofinstrument 19 and is held rigidly in place.Flat surfaces interface 560 mate withflat surfaces 565 b (FIG. 18 ) and 565 a (not shown) at the distal end of activation member 34 (clamp arm 60) andrail 562 slidably engagingslot 564 onclamp arm 60 anddistra shroud 76 andouter shroud 72 all provide structural support to maintainadapter 550 firmly engaged withinstrument 19. - Clockwise annular motion or torque is imparted to
hand wrench 500 throughpaddles 504. The torque is transmitted througharms 501 and teeth 501 a to gears 556, which in turn transmit the torque to thewaveguide 80 viaclamp arm assembly 60 viaouter shroud 72 via insulated pin 27. When a user imparts 5-12 lbs. of torque, theramps arms 501 to move or flex away from the centerline ofwrench 500 ensuring that the user does not over-tighten thewaveguide 80 ontotransducer 50. When a counter-clockwise torque is applied towrench 500 viapaddles 504, the perpendicular flat sides ofteeth 501 a and 556 abut allowing a user to impart a torque to the interface between thewaveguide 80 andtransducer 50 in proportion to the force applied to the paddles facilitating removal of theinstrument 100 from thetransducer 50. Thetorque wrench 450 may be constructed from a durable plastic, such as polycarbonate or a liquid crystal polymer. It is also contemplated that thewrench 450 may alternatively be made from a variety of materials including other plastics, ceramics or metals. - In another embodiment (not shown), the paddles and cantilever arm assembly may be separate components attached by mechanical means or chemical means such as adhesives or glue.
- Preferably, the ultrasonic
clamp coagulator apparatus 19 described above will be processed before surgery. First, a new or used ultrasonic clamp coagulator apparatus is obtained and if necessary cleaned. The ultrasonic clamp coagulator apparatus can then be sterilized. In one sterilization technique the ultrasonic clamp coagulator apparatus is placed in a closed and sealed container, such as a plastic or TYVEK bag. Optionally, the ultrasonic clamp coagulator apparatus can be bundled in the container as a kit with other components, including atorque wrench 450. The container and ultrasonic clamp coagulator apparatus, as well as any other components, are then placed in a field of radiation that can penetrate the container, such as gamma radiation, x-rays, or high-energy electrons. The radiation kills bacteria on the ultrasonic clamp coagulator apparatus and in the container. The sterilized ultrasonic clamp coagulator apparatus can then be stored in the sterile container. The sealed container keeps the ultrasonic clamp coagulator apparatus sterile until it is opened in the medical facility. - While the present invention has been illustrated by description of several embodiments, it is not the intention of the applicant to restrict or limit the spirit and scope of the appended claims to such detail. Numerous variations, changes, and substitutions will occur to those skilled in the art without departing from the scope of the invention. Moreover, the structure of each element associated with the present invention can be alternatively described as a means for providing the function performed by the element. Accordingly, it is intended that the invention be limited only by the spirit and scope of the appended claims.
Claims (27)
1. An ultrasonic apparatus comprising:
an ultrasonic waveguide having a proximal end and a distal end;
an ultrasonically actuated blade attached to the distal end of the waveguide;
a tissue pad having a tissue engaging surface having a first width and a second width less than the first width;
a clamp member defining a distal portion and a proximal portion and moveable with respect to the blade and having an open position in which at least a portion of the clamp member is spaced from the blade and a closed position in which the clamp member is adjacent to the blade for clamping tissue between the tissue pad and the blade.
2. The ultrasonic apparatus according to claim 1 , wherein the clamp member defines a first dimension and a second dimension in a first plane and the first dimension is greater than the second dimension.
3. The ultrasonic apparatus according to claim 2 , wherein the clamp member defines a first dimension and a second dimension in a second plane and the first dimension is greater than the second dimension.
4. A method of assembling a sterilized ultrasonic clamp coagulator apparatus comprising the steps of:
providing:
an ultrasonic waveguide having a proximal end and a distal end;
an ultrasonically actuated blade attached to the distal end of the waveguide;
a tissue pad having a flange and a tissue engaging surface having a first width and a second width less than the first width;
a clamp member moveable with respect to the blade and having an open position in which at least a portion of the clamp member is spaced from the blade and a closed position in which the clamp member is adjacent to the blade for clamping tissue between the tissue pad and the blade, the clamp member comprising a slot for slidably receiving the flange;
slidably engaging the flange within the slot; and
sterilizing the clamp coagulator apparatus.
5. A tissue pad for use in an ultrasonic clamp coagulator made from a composition comprising PTFE, the tissue pad portion having first and second ends, each defining a width dimension and a rough tissue engaging surface disposed therebetween, wherein the width of the first end is less than the width of the second end.
6. The tissue pad according to claim 5 , wherein the rough tissue engaging surface of the first tissue pad portion comprises a saw tooth configuration.
7. The tissue pad according to claim 5 , wherein the tissue pad portion has a substantially T-shaped flange formed on a surface opposite the rough tissue engaging surface.
8. A method of mounting the tissue pad according to claim 5 onto an arm of an ultrasonic clamp coagulator, the coagulator comprising a handle portion, the arm having a proximal portion and a distal portion, the distal portion being farther from the handle than the proximal portion and having a T-shaped slot formed therein, the mounting method comprising the step of: inserting the tissue pad portion into the distal portion of the arm by inserting the T-shaped flange formed on the tissue pad portion into the T-shaped slot formed in the distal portion of the arm.
9. The method according to claim 8 , further comprising the step of gluing the tissue pad portion to the arm of the ultrasonic clamp coagulator.
10. The method according to claim 8 , wherein the T-shaped slot into which the T-shaped flange is inserted is curved in a plane that lies substantially parallel to the tissue engaging surface of the first tissue pad portion.
11. An ultrasonic surgical instrument comprising:
a housing for accepting a transducer and further defining a longitudinal axis;
a first switch positioned on the housing for actuation by one or more fingers of a user in a direction parallel to the longitudinal axis and further electrically connected to a generator for providing an electrical signal to the generator for controlling a first level of ultrasonic energy delivered by the transducer.
12. An ultrasonic surgical instrument according to claim 11 further comprising a second switch positioned on the housing for actuation by one or more fingers of a user in a direction parallel to the longitudinal axis and further electrically connected to a generator for providing an electrical signal to the generator for controlling a second level of ultrasonic energy delivered by the transducer.
13. An ultrasonic surgical instrument according to claim 12 , wherein the electrical connection between the first and second switch comprises a spring-biased pin.
14. An ultrasonic surgical instrument comprising an ultrasonic waveguide defining a longitudinal axis, having a proximal end, a most distal node and a distal end wherein the waveguide comprises:
an ultrasonically actuated blade positioned at the distal end of the waveguide and defining a functional asymmetry within a first plane;
a first balance asymmetry distal to the most distal node and proximal to the blade; and
a second balance asymmetry proximal to the most distal node.
15. The ultrasonic surgical instrument according to claim 14 , wherein the first balance asymmetry is cut at an angle relative to the longitudinal axis.
16. The ultrasonic surgical instrument according to claim 14 , wherein the second balance asymmetry defines an angled balance cut contained in a second plane orthogonal to the first plane.
17. The ultrasonic surgical instrument according to claim 14 , wherein the functional asymmetry includes a balance asymmetry.
18. The ultrasonic surgical instrument according to claim 14 , wherein the blade defines a taper.
19. An ultrasonic surgical instrument comprising:
a housing;
an outer shroud having a proximal end joined to the housing, the outer tube defining a longitudinal axis;
an ultrasonic waveguide positioned within the outer tube, having a proximal end, a distal end and an ultrasonically actuated blade positioned at the distal end of the waveguide;
an actuating lever for operating a clamp arm located at the distal end of the lever, wherein the actuating lever comprises camming members, which operatively engage the outer tube such that movement of the actuating lever positions the clamp arm between open and clamped positions relative to the blade.
20. The ultrasonic surgical instrument according to claim 19 , wherein the outer shroud comprises slots for engaging the camming members.
21. The ultrasonic surgical instrument according to claim 19 , wherein the camming members are cylindrical.
22. The ultrasonic surgical instrument according to claim 19 , wherein the camming members are spherical.
23. The ultrasonic surgical instrument according to claim 20 , wherein the slots comprise an elasto-meric insert.
24. An ultrasonic surgical instrument comprising:
a housing defining a longitudinal axis;
an ultrasonic waveguide positioned within the housing, having a proximal end, a distal end and an ultrasonically actuated blade positioned at the distal end of the waveguide;
a transducer removably connected to the waveguide;
a handle assembly comprising a moveable actuation lever for operating a clamp arm located at the distal end of the lever, and a stationary finger ring defining an opening having a length L; wherein the housing and transducer are sized to position a center of gravity of the surgical instrument at the housing within the dimension of length L.
25. The ultrasonic surgical instrument according to claim 24 , wherein the length L is parallel to the longitudinal axis.
26. The ultrasonic surgical instrument according to claim 24 , wherein the housing and actuation lever is made from a thermoplastic with a filler selected from the group consisting of aluminum nitride and boron nitride.
27. A torque wrench for use with an ultrasonic clamp coagulator apparatus, comprising:
a hand wrench body having an axis;
a cantilever arm movably attached to said wrench body having proximal and distal ends annularly disposed about said axis;
at least one tooth located at the cantilever arm's distal end; and
an adaptor defining a lumen and rotatably attached to the hand wrench and comprising a cam for operatively engaging the tooth.
Priority Applications (16)
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US11/548,407 US20070191713A1 (en) | 2005-10-14 | 2006-10-11 | Ultrasonic device for cutting and coagulating |
JP2008535673A JP4980363B2 (en) | 2005-10-14 | 2006-10-12 | Ultrasonic equipment for cutting and coagulation |
EP17162008.1A EP3207886B1 (en) | 2005-10-14 | 2006-10-12 | Ultrasonic device for cutting and coagulating |
PCT/US2006/039904 WO2007047380A2 (en) | 2005-10-14 | 2006-10-12 | Ultrasonic device for cutting and coagulating |
EP06825838.3A EP1948026B8 (en) | 2005-10-14 | 2006-10-12 | Ultrasonic device for cutting and coagulating |
AU2006304189A AU2006304189A1 (en) | 2005-10-14 | 2006-10-12 | Ultrasonic device for cutting and coagulating |
CA002625793A CA2625793A1 (en) | 2005-10-14 | 2006-10-12 | Ultrasonic device for cutting and coagulating |
EP19213287.6A EP3639773A1 (en) | 2005-10-14 | 2006-10-12 | Ultrasonic device for cutting and coagulating |
CN2006800426027A CN101511286B (en) | 2005-10-14 | 2006-10-12 | Ultrasonic device for cutting and coagulating |
BRPI0617337A BRPI0617337B8 (en) | 2005-10-14 | 2006-10-12 | ultrasonic device |
ES06825838.3T ES2625983T3 (en) | 2005-10-14 | 2006-10-12 | Ultrasonic device for cutting and coagulating |
US12/622,172 US20100094323A1 (en) | 2005-10-14 | 2009-11-19 | Tissue pad for an ultrasonic device for cutting and coagulating |
US13/311,695 US20120078249A1 (en) | 2005-10-14 | 2011-12-06 | Ultrasonic device for cutting and coagulating |
US14/223,121 US20140207163A1 (en) | 2005-10-14 | 2014-03-24 | Ultrasonic device for cutting and coagulating |
US15/690,925 US10856896B2 (en) | 2005-10-14 | 2017-08-30 | Ultrasonic device for cutting and coagulating |
US17/112,272 US11998229B2 (en) | 2005-10-14 | 2020-12-04 | Ultrasonic device for cutting and coagulating |
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US11/548,407 US20070191713A1 (en) | 2005-10-14 | 2006-10-11 | Ultrasonic device for cutting and coagulating |
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US12/622,172 Abandoned US20100094323A1 (en) | 2005-10-14 | 2009-11-19 | Tissue pad for an ultrasonic device for cutting and coagulating |
US13/311,695 Abandoned US20120078249A1 (en) | 2005-10-14 | 2011-12-06 | Ultrasonic device for cutting and coagulating |
US14/223,121 Abandoned US20140207163A1 (en) | 2005-10-14 | 2014-03-24 | Ultrasonic device for cutting and coagulating |
US15/690,925 Active 2027-07-31 US10856896B2 (en) | 2005-10-14 | 2017-08-30 | Ultrasonic device for cutting and coagulating |
US17/112,272 Active 2027-07-17 US11998229B2 (en) | 2005-10-14 | 2020-12-04 | Ultrasonic device for cutting and coagulating |
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US12/622,172 Abandoned US20100094323A1 (en) | 2005-10-14 | 2009-11-19 | Tissue pad for an ultrasonic device for cutting and coagulating |
US13/311,695 Abandoned US20120078249A1 (en) | 2005-10-14 | 2011-12-06 | Ultrasonic device for cutting and coagulating |
US14/223,121 Abandoned US20140207163A1 (en) | 2005-10-14 | 2014-03-24 | Ultrasonic device for cutting and coagulating |
US15/690,925 Active 2027-07-31 US10856896B2 (en) | 2005-10-14 | 2017-08-30 | Ultrasonic device for cutting and coagulating |
US17/112,272 Active 2027-07-17 US11998229B2 (en) | 2005-10-14 | 2020-12-04 | Ultrasonic device for cutting and coagulating |
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- 2006-10-12 WO PCT/US2006/039904 patent/WO2007047380A2/en active Application Filing
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- 2006-10-12 EP EP06825838.3A patent/EP1948026B8/en active Active
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2009
- 2009-11-19 US US12/622,172 patent/US20100094323A1/en not_active Abandoned
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2011
- 2011-12-06 US US13/311,695 patent/US20120078249A1/en not_active Abandoned
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2014
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2017
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2020
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US20100094323A1 (en) | 2010-04-15 |
AU2006304189A1 (en) | 2007-04-26 |
US20120078249A1 (en) | 2012-03-29 |
US10856896B2 (en) | 2020-12-08 |
BRPI0617337B8 (en) | 2021-06-22 |
EP1948026B1 (en) | 2017-03-22 |
EP1948026A4 (en) | 2012-03-07 |
ES2625983T3 (en) | 2017-07-21 |
BRPI0617337B1 (en) | 2018-09-25 |
US20140207163A1 (en) | 2014-07-24 |
EP3207886A1 (en) | 2017-08-23 |
US20210145473A1 (en) | 2021-05-20 |
BRPI0617337A2 (en) | 2011-07-26 |
US11998229B2 (en) | 2024-06-04 |
CN101511286A (en) | 2009-08-19 |
EP3639773A1 (en) | 2020-04-22 |
JP2009514566A (en) | 2009-04-09 |
EP1948026A2 (en) | 2008-07-30 |
JP4980363B2 (en) | 2012-07-18 |
WO2007047380A2 (en) | 2007-04-26 |
WO2007047380A3 (en) | 2009-04-30 |
CA2625793A1 (en) | 2007-04-26 |
EP3207886B1 (en) | 2019-12-04 |
CN101511286B (en) | 2012-07-04 |
US20170360468A1 (en) | 2017-12-21 |
EP1948026B8 (en) | 2017-05-31 |
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