GB2567435A - Bipolar surgical instruments - Google Patents

Bipolar surgical instruments Download PDF

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Publication number
GB2567435A
GB2567435A GB1716572.1A GB201716572A GB2567435A GB 2567435 A GB2567435 A GB 2567435A GB 201716572 A GB201716572 A GB 201716572A GB 2567435 A GB2567435 A GB 2567435A
Authority
GB
United Kingdom
Prior art keywords
shaft
actuation
locking portion
position
aperture
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
GB1716572.1A
Other versions
GB201716572D0 (en
Inventor
John Thomas Daniel
Joel Stanbridge Daniel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gyrus Medical Ltd
Original Assignee
Gyrus Medical Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gyrus Medical Ltd filed Critical Gyrus Medical Ltd
Priority to GB1716572.1A priority Critical patent/GB2567435A/en
Publication of GB201716572D0 publication Critical patent/GB201716572D0/en
Publication of GB2567435A publication Critical patent/GB2567435A/en
Application status is Pending legal-status Critical

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Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/04Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
    • A61B18/12Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
    • A61B18/14Probes or electrodes therefor
    • A61B18/1442Probes having pivoting end effectors, e.g. forceps
    • A61B18/1445Probes having pivoting end effectors, e.g. forceps at the distal end of a shaft, e.g. forceps or scissors at the end of a rigid rod
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/04Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
    • A61B18/12Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
    • A61B18/14Probes or electrodes therefor
    • A61B18/1442Probes having pivoting end effectors, e.g. forceps
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00571Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body for achieving a particular surgical effect
    • A61B2018/0063Sealing

Abstract

A bipolar surgical instrument (1 figure 3) comprises a body (2), first and second opposed jaws (18, 20) located at the distal end of an actuation shaft 34. A shaft locking portion 60 mounted on the shaft 34 and engaged with a bias element (32) and with an engagement feature 63,65 of an end region of the actuation shaft 34, such that the shaft locking portion 60 is movable with the actuation shaft 34, and the shaft locking portion 60 defines an aperture 70,71 through which the actuation shaft 34 extends. The shaft locking portion 60 having a first position 71 in which the shaft locking portion is engaged with the shaft for movement therewith, and a second position 70 in which the shaft locking portion is movable longitudinally with respect to the shaft, the shaft locking portion 60 and shaft 34 being rotatable with respect to one another between the first and second positions of the shaft locking portion. The Aperture 70,71 of the shaft locking portion 60 may have an insertion aperture 70 in a first polar position and a locking aperture 71 in a second polar position the apertures 70,71 being contiguous.

Description

BIPOLAR SURGICAL INSTRUMENTS

The present invention relates to bipolar surgical instruments.

BACKGROUND OF THE INVENTION

Bipolar surgical instruments are used to clamp and seal tissue, particularly blood vessels, during surgical procedures. Clamping is typically achieved using a pair of opposed jaws that are remotely operable to clamp around the tissue being sealed. Sealing is typically achieved using application of radio frequency energy delivered to the tissue being sealed by electrodes mounted on the opposed jaws of the instrument.

The opposed jaws are actuated by the operator of the instrument squeezing a rotatable grip that actuates an actuation shaft connected with the jaws, in existing designs, the shaft is engaged with the grip using a. snap fit moulding or a retaining pin. However, existing designs have several drawbacks. The snap fit solution typically suffers with a lack of resilience in the material, leading to insufficient spring back of the snap fit assembly. A retaining pin requires an additional component which adds to the complication of manufacturing of the instrument

Therefore, it is desirable to provide a bipolar surgical instrument that is able address the short comings of the previously-considered designs,

SUMMARY OF THE INVENTION

Aspects of the present invention are set out in the attached claims.

According to one exemplary aspect, there is provided a bipolar surgical instrument comprising a body, a fixed grip which extends from the body, an elongate shaft attached to, and extending from, the body, the shaft extending to a distal end, first and second opposed jaws located at the distal end of the shaft, the first jaw being movable with respect to the second jaw between an open position in which the first and second jaws are spaced apart from one another, and a closed position in which the first and second jaws are adjacent one another, an actuation shaft connected with at least the first jaw, the actuation shaft being movable with respect to the body and the shaft between a first position in which the jaws are in the open position, and a second position in which the jaws are in the closed position, an actuation grip movably mounted on the body, and arranged to operate the actuation shaft, the actuation grip having a released position in which the actuation shaft is in the first position, and an engaged position in which the actuation shaft is in the second position, a bias element arranged to bias the actuation grip towards the released position with an actuation grip return force, and a shaft locking portion mounted on the shaft and engaged with the bias element and with an engagement feature of an end region of the actuation shaft, such that the shaft locking portion is movable with the actuation shaft, and wherein the shaft locking portion defines an aperture therethrough, through which aperture the actuation shaft extends, the shaft locking portion having a first position in which the shaft locking portion is engaged with the shaft for movement therewith, and a second position in which the shaft locking portion is movable longitudinally with respect to the shaft, the shaft locking portion and shaft being rotatable with respect to one another between the first and second positions of the shaft locking portion.

In one example, the aperture of the shaft locking portion is provided by an insertion aperture in a first polar position and a locking aperture in a second polar position, the insertion aperture being contiguous with the locking aperture.

In one example, an end region of the shaft and the aperture of the shaft locking portion have substantially similar shape longitudinal cross-sections.

In such an example, the end region of the shaft comprises first and second substantially planar flanges that extend longitudinally along the shaft and transverse to the shaft, and a third flange that extends longitudinally along the shaft, and in a direction out of the plane of the first and second flanges.

In such an example, the first, second and third flanges provide the end region of the shaft with a T-shaped longitudinal cross section.

In such an example, wherein the end region of the shaft comprises a folded planar material, having respective folds defining the first, second and third flanges.

In one example, the actuation grip is mounted on a pivot point for rotation with respect to the body and fixed grip, the actuation grip being rotatable about the pivot point between the released and engaged positions.

BRIEF DESCRIPTION OF THE DRAWINGS

Figures 1 and 2 show side views of a bipolar surgical instrument embodying one aspect of the present invention in open and closed positions respectively;

Figure 3 shows a cross-sectional schematic side view of the bipolar surgical instrument of Figure 1;

Figure 4 shows a cross-sectional schematic side view of part of the bipolar surgical instrument of Figures 1 to 3;

Figure 5 shows a schematic perspective view of part of the bipolar surgical instrument of Figures 1 to 3;

Figure 5 shows a schematic end view of part of the bipolar surgical instrument of Figures 1 to 3; and

Figures 7 to 9 illustrate steps in securing the part of Figure 5 into to the part of Figure 6.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

An example bipolar surgical instrument 1 is shown schematically in Figures 1 and 2. Figure 1 illustrates an open position of the instrument 1, and Figure 2 illustrates a closed position thereof.

The instrument 1 comprises a body 2 having a main housing 4 from which a fixed grip 6 extends. The fixed grip 6 is held during use by the operator of the instrument 1. A movable actuation grip 8 is movably mounted on the main housing 4 of the body 2. An elongate shaft 10 is attached to the main housing 4 of the body 2, and extends from a proximal end 12 at the main housing 4, to a distal end 14 of the shaft 10. The shaft 10 defines a longitudinal axis therealong, and an elongate passage extends from the proximal end 12 to the distal end 14 of the shaft 10. As will be described in more detail below, an actuation shaft extends from the main housing 4 through the passage of the shaft 10. A pair 16 of opposed jaws are located at the distal end 14 of the shaft 10. The pair 16 of jaws comprises a first jaw 18 and a second jaw 20. In the example of Figures 1 and 2, the first and second jaws 18 and 20 are pivotally mounted on a jaw pivot 22. The first and second jaws 18 and 20 are pivotable about the jaw pivot 22, between an open position (as shown in Figure 1) in which the jaws 18 and 20 are separated from one another, and a closed position (as shown in Figure 2) in which the jaws 18 and 20 are adjacent one another. In another example of a bipolar instrument embodying the present invention, only one of the jaws is movable. In another example, the movable jaw or jaws may be movable in any suitable manner, for example linearly, or in a combination of rotation and linear movement.

The exact nature of the movement of the jaws is not important in the context of the present invention.

The operator of the instrument 1 moves the actuation grip 8 from a first position (shown in Figure 1) to a second position (shown in Figure 2) in order to move the jaws 18 and 20 from the open position to the closed position. During an operation, tissue to be sealed is held between the jaws in the closed position for a predetermined time period, with pressure applied by the operator.

Figure 3 shows a cross-sectional schematic side view of the instrument of Figures 1 and 2. The main housing 4 of the instrument 1 provides an actuation grip pivot 30 on which the actuation grip 8 is mounted. The actuation grip 8 is able to rotate about the actuation grip pivot 30 under the control of the operator between the open and closed positions of the instrument 1. The actuation grip 8 is biased towards the open position by a resilient bias means, such as a spring 32. An actuation shaft 34 extends from the main housing 4 along the elongate shaft 10, through the passage therein, to the first and second jaws 18 and 20 at the distal end of the elongate shaft 10. The actuation shaft 34 is attached to the actuation grip 8 by way of a shaft retaining portion 36. The shaft retaining portion 36 ensures that as the actuation grip 8 is rotated about the actuation grip pivot 30 that the actuation shaft 34 is moved linearly within the passage of the elongate shaft 10.

An actuation pin is attached to the distal end of the actuation shaft 34. The actuation pin engages with actuation slots of the first and second jaws 18 and 20, and is used to move the jaws 18 and 20 between the open and closed positions.

An actuation grip extension 40 extends from the actuation grip 8 at a position remote from the actuation grip pivot 30 the actuation grip extension 40 carries an actuation grip engagement portion. A retaining mechanism 42 is located in the fixed grip 6 of the instrument 1, and defines a receiving aperture for receiving the actuation grip engagement portion therein, when the instrument 1 is in the closed position. The actuation grip extension 40 extends into the fixed grip 6 when the instrument is in the closed position, such that the engagement portion engages with the holding mechanism 42.

In addition to the actuation shaft 34, in this example, a cutting blade 38 extends through the elongate shaft 10 from the main housing for of the instrument 1 to the distal end of the elongate shaft 10. A blade actuator 50 is rotatably mounted on a blade actuator pivot 52 located in the housing 4. The blade actuator 50 is attached to the blade 38 such that rotation of the blade actuator causes linear movement of the blade 70 along the longitudinal axis of the elongate shaft 10.

In operation, the operator of the instrument 1 holds the fixed grip 6 in order to position the jaws 18 and 20 at the appropriate point around a vessel to be sealed. The operator squeezes the actuation grip 8 in order to close the jaws 18 and 20 around the vessel to be sealed. The action of squeezing the actuation grip 8 causes the actuation grip 8 to rotate about the actuation grip pivot 30, thereby moving the shaft retention portion 36 along the longitudinal axis of the instrument 1 in a direction away from the distal end 14 of the elongate shaft 10. This movement of the shaft retention portion 36 causes the actuation shaft 34 to move along the elongate shaft 10 towards the main housing 4. The actuation pin engages the actuation slots, thereby causing the jaws 18 and 20 to rotate into the closed position.

The actuation grip extension 40 is moved into the fixed grip 6, such that the actuation grip engagement portion engages with the retaining mechanism 42 in order to retain the actuation grip 8 in the closed position.

Whilst in the closed position, suitable electrical energy is supplied to the electrodes carried by the first and second jaws 18 and 20, so as to seal the vessel being gripped by the jaws 18 and 20. Once sealing has occurred, the actuation grip 8 can be moved by the operator, with the assistance of the bias means 32 to the open position so as to release the jaws 18 and 20 from around the vessel being sealed.

The bias means (spring) 32 is retained in compression around the shaft 34 by a spring compression adjuster 33. The adjuster 33 is a threaded wheel, in this example, and is rotated to adjust the length, and hence compression, of the spring 32. The ability to vary the compression of the spring 32 allows the operator of the instrument to adjust the amount of force required to close the jaws 18 and 20.

In accordance with the principles of an aspect of the present invention, the shaft 34 extends through the adjuster 33, and is held in place by a shaft locking portion 60. The shaft locking portion 60 is located in the adjuster 33. The shaft 34 is able to move longitudinally with respect to the shaft locking portion 60. The range of movement of the shaft 34 is limited by the range of movement of the actuation grip 8 in the closing direction, and by the locking portion 60 in the opening direction.

The shaft 34, shaft retaining portion 36, adjuster 33 and shaft locking portion 60 are shown in more detail in Figure 4. The shaft 34 extends through, and is engaged with, the shaft retaining portion 36, such that the shaft 34 and retention portion 36 are movable together within the instrument 1. The shaft 34 also extends through the adjuster 33, and through the locking portion 60. The shaft is engaged with the locking portion 60, as will be described in more detail below, so that the locking portion 60 and shaft are moveable together with respect to the instrument 1. The spring 32 extends between the shaft retaining portion 36 and the adjuster 33, radially outside the shaft 34, such that the distance between the adjuster 33 and shaft retaining portion 36 determines the compression of the spring 32.

Engagement of the shaft 34 with the shaft locking portion 60 is shown in more detail in Figures 5 to 9. Figure 5 illustrates an end region of the shaft 34. This end region, in this example, has an end cross section in the general form of a “T”. This cross section is provided by first and second substantially planar flanges 62 and 64 which extend along in a direction parallel to the longitudinal axis of the shaft 34 from an end of the shaft 34, and transverse to the longitudinal axis. The first and second flanges 62 and 64 define respective first and second slots 63 and 65 which extend partially inwardly from respective outer edges of the first and second flanges 62 and 64. The first and second slots 63 and 65 are spaced apart from the end of the shaft 34, and extend in a direction parallel to the longitudinal axis by a distance at least that required to allow the shaft 34 to move from the open position to the closed position of the first and second jaws 18 and 20. A third flange 66 extends from the first and second flanges 62 and 64, in a direction out of the plane of the first and second flanges 62 and 64, and along the shaft 34 from the end thereof, such that the first, second and third flanges 62, 64 and 66 form an end view in the form of a “T”. A third slot 67 is defined in the third flange 66, and extends into that flange from an outer edge thereof. The third slot 67 extends in a direction parallel to the longitudinal axis by a distance at least that required to allow the shaft 34 to move from the open position to the closed position of the first and second jaws 18 and 20. The first, second and third flanges 63, 65 and 67 are substantially aligned at a predetermined distance from the end of the shaft 34.

The first, second and third flanges 63, 65 and 67 may be provided by any suitable arrangement. In the example shown, the end region of the shaft 34 is provided by a folded sheet of material such that a first fold defines the first flange 62, a second fold defines the third flange 66, and a third fold defines the second flange 64. The resulting cross-section of the end region of the shaft 34 is the required “T” shape. It will be readily appreciated that the end region of the shaft 34 may be provided by any appropriate construction, for example by an extruded component.

Figure 6 illustrates an end view of the shaft locking portion 60. The shaft locking portion 60, in this example, is circular in end cross-section, and fits within a circular aperture in the adjuster 30. The shaft locking portion 60 is slidable within the adjuster 30. The shaft locking portion 60 defines an aperture therethrough for reception of the end region of the shaft 34 shown in Figure 4.

The aperture through the shaft locking portion 60 comprises an insertion aperture 70, and a locking aperture 71, that combine to form the single aperture through the portion 60. The locking aperture 71 is rotationally offset from the insertion aperture. The insertion aperture 70 defines first, second and third aperture portions 72, 74 and 76 for reception of the first, second and third flanges 63, 65 and 67 respectively. The insertion aperture 70 also includes linking portions that link the insertion aperture with the locking aperture 71. The insertion aperture 70 is contiguous with the locking aperture 70, so that a single aperture is provided through the shaft locking portion 60.

The locking aperture 71 comprises first second and third locking aperture portions 82, 84 and 86 sized to receive the first, second and third flanges 62, 64 and 66, adjacent to the first, second and third slots 63, 65 and 67. The shaft locking portion 60 defines locking recesses 83, 85 and 87 that extend from the locking aperture portions 82, 84 and 86 respectively. The locking recesses 83, 85 and 87 extend longitudinally into the shaft locking portion 60, and provide locations for engagement with respective edges regions of the first, second and third slots 63, 65 and 67, as will be described below.

Figures 7 to 9 illustrate insertion and locking of the end region of the shaft 34 in the shaft locking portion 60. In Figure 7, initial insertion of the end region of the shaft 34 through the insertion aperture 70 of the shaft locking portion 60. The shape and size of the insertion aperture 70 enables the end region of the shaft 34 to pass through the shaft locking portion 60, to the position shown in Figure 8.

In Figure 8, the end region of the shaft 34 is shown extending through the shaft locking portion 60, with the first, second and third slots 63, 65 and 67 aligning with the first, second and third recesses 83, 85 and 87 respectively. This alignment allows the shaft 34 to be rotated with respect to the shaft locking portion 60 from a first position (Figure 8) in which the shaft 34 is substantially aligned with the insertion aperture 70 to a second position (Figure 9) in which the shaft 34 is substantially aligned with the locking aperture 71 of the shaft locking portion 60. The first, second and third slots 63, 65 and 67 extend around the shaft locking portion 60 such that the end region of the shaft 34 is engaged with the shaft locking portion.

Following insertion and rotation of the shaft 34, release of the shaft 34 allows the spring 32 to act on the shaft locking portion 60, so as to engage the edges of the first, second and third slots 63, 65 and 67 with the recesses 83, 85 and 87 of the shaft locking portion 60 respectively. The recesses serve to prevent unwanted rotation of the shaft 34 with respect to the shaft locking portion 60. The action of the spring 32 also serves to cause the shaft locking portion 60 to be retained within the adjuster 33.

In the first position, the shaft locking portion 60 and shaft 34 are movable longitudinally with respect to one another. In the second position, the shaft locking portion 60 and shaft 34 are locked together, such that there is substantially no longitudinal movement between the two components. As described above, the shaft 34 and shaft locking portion 60 are rotatable with respect to one another between the first and second positions.

Rotation of the actuation grip 8 about the actuation grip pivot 30 serves to move the shaft 34 longitudinally with respect to the instrument 1. The shaft locking portion 60 moves longitudinally with the shaft 34 within the adjuster 30, and serves to maintain the radial position of the shaft 34.

It will be readily appreciated that the end region of the shaft 34, and the corresponding aperture through the shaft locking portion 60, can be of any appropriate shape that provides the necessary insertion and locking positions (the first and second positions mentioned above). It will be appreciated that the end region of the shaft 34 may be of any suitable longitudinal cross-section.

Accordingly, embodiments the present invention are able to provide bipolar surgical instruments that provide improved shaft locking.

Claims (7)

CLAIMS:
1. A bipolar surgical instrument comprising: a body; a fixed grip which extends from the body; an elongate shaft attached to, and extending from, the body, the shaft extending to a distal end; first and second opposed jaws located at the distal end of the shaft, the first jaw being movable with respect to the second jaw between an open position in which the first and second jaws are spaced apart from one another, and a closed position in which the first and second jaws are adjacent one another; an actuation shaft connected with at least the first jaw, the actuation shaft being movable with respect to the body and the shaft between a first position in which the jaws are in the open position, and a second position in which the jaws are in the closed position; an actuation grip movably mounted on the body, and arranged to operate the actuation shaft, the actuation grip having a released position in which the actuation shaft is in the first position, and an engaged position in which the actuation shaft is in the second position; a bias element arranged to bias the actuation grip towards the released position with an actuation grip return force; and a shaft locking portion mounted on the shaft and engaged with the bias element and with an engagement feature of an end region of the actuation shaft, such that the shaft locking portion is movable with the actuation shaft, and wherein the shaft locking portion defines an aperture therethrough, through which aperture the actuation shaft extends, the shaft locking portion having a first position in which the shaft locking portion is engaged with the shaft for movement therewith, and a second position in which the shaft locking portion is movable longitudinally with respect to the shaft, the shaft locking portion and shaft being rotatable with respect to one another between the first and second positions of the shaft locking portion.
2. An instrument as claimed in claim 1, wherein the aperture of the shaft locking portion is provided by an insertion aperture in a first polar position and a locking aperture in a second polar position, the insertion aperture being contiguous with the locking aperture.
3. An instrument as claimed in claim 1 or 2, wherein an end region of the shaft and the aperture of the shaft locking portion have substantially similar shape longitudinal cross-sections.
4. An instrument as claimed in claim 3, wherein the end region of the shaft comprises first and second substantially planar flanges that extend longitudinally along the shaft and transverse to the shaft, and a third flange that extends longitudinally along the shaft, and in a direction out of the plane of the first and second flanges.
5. An instrument as claimed in claim 4, wherein the first, second and third flanges provide the end region of the shaft with a T-shaped longitudinal cross section.
6. An instrument as claimed in claim 4 or 5, wherein the end region of the shaft comprises a folded planar material, having respective folds defining the first, second and third flanges.
7. An instrument as claimed in any one of the preceding claims, wherein the actuation grip is mounted on a pivot point for rotation with respect to the body and fixed grip, the actuation grip being rotatable about the pivot point between the released and engaged positions.
GB1716572.1A 2017-10-10 2017-10-10 Bipolar surgical instruments Pending GB2567435A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1716572.1A GB2567435A (en) 2017-10-10 2017-10-10 Bipolar surgical instruments

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1716572.1A GB2567435A (en) 2017-10-10 2017-10-10 Bipolar surgical instruments

Publications (2)

Publication Number Publication Date
GB201716572D0 GB201716572D0 (en) 2017-11-22
GB2567435A true GB2567435A (en) 2019-04-17

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB1716572.1A Pending GB2567435A (en) 2017-10-10 2017-10-10 Bipolar surgical instruments

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GB (1) GB2567435A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2777539A2 (en) * 2013-03-14 2014-09-17 Ethicon Endo-Surgery, Inc. Drive system lockout arrangements for modular surgical instruments
US20170196623A1 (en) * 2016-01-12 2017-07-13 Gyrus Medical Limited Electrosurgical device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2777539A2 (en) * 2013-03-14 2014-09-17 Ethicon Endo-Surgery, Inc. Drive system lockout arrangements for modular surgical instruments
US20170196623A1 (en) * 2016-01-12 2017-07-13 Gyrus Medical Limited Electrosurgical device
US20170196630A1 (en) * 2016-01-12 2017-07-13 Gyrus Medical Limited Electrosurgical device

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Publication number Publication date
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