AU738262B2 - Surgical cutting tool - Google Patents

Description

Regulation 3.2

AUSTRALIA

Patents Act 1990 COMPLETE SPECIFICATION FOR A STANDARD DIVISIONAL PATENT

(ORIGINAL)

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5 Name of Applicants:

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Hagop Samuel Manushakian AND Martin Christopher Weisselberg, of 159 Brindley Close, London HAO 1BU, United Kingdom and 152 Hemingford AND, London, N1 1DE, United Kingdom, respectively Hagop Samuel Manushakian Actual Inventor: Invention Title: "Surgical cutting tool" The following statement is a full description of this invention, including the best method of performing it known to us: 1 P:\OPER\DH3 1209-99 RS I. DOC 28/6/01 -2- Surgical cutting tool This invention relates to a surgical cutting tool.

When using such a tool, for example surgical scissors, or a surgical scalpel, the surgeon normally needs to have at least one assistant who can carry out suctioning at the site where the surgical tool is being used, so as to remove blood and other body fluids which are released by the use of the tool and which would otherwise obscure the surgeon's field of view. Such an assistant may also carry out ancillary tasks, for example cauterisation.

"However, the need to involve an assistant has a number of disadvantages. One of these is that the carrying out of activities by the assistant at the same site as that where the surgeon is working may impede the surgeon's activities, and thus render them more difficult, or at least make the operation more lengthy. Furthermore, if it were not necessary for the assistant to carry suctioning and cauterisation, the assistant might be more usefully employed in other tasks to assist the surgeon, and under some circumstances no assistant might be required at all.

In a first aspect this invention provides a pair of surgical scissors comprising first and second blades each having a cutting surface and an exterior surface, the cutting surfaces facing one another, the blades being pivotally connected to one another for relative pivotal movement about a pivotal axis, one of the blades having a distal blade portion electrically insulated from the remainder of the blade, a first electrical conductor electrically connected to the said distal blade portion, and a second electrical conductor electrically connected elsewhere on the scissors, thereby enabling the scissors to act as a cautery.

The surgical cutting scissors according to the invention may be provided with means for clamping tissue on which the surgeon is operating.

4 The invention will now be further described with reference to the accompanying P:\OPER\DH\31209-99 RSI. DOC 28/6/01 -3drawings, in which: Figure 1 shows a pair of surgical scissors; Figure 2 shows a view on an enlarged scale of the tip of one type of blade which may be used in the scissors of Figure 1; Figure 3 shows an alternative type of tip for use in the scissors of Figure 1; Figure 4 shows a second example of surgical scissors; Figures 5a to 5d show a first combination of scissor tip configurations which can be Sused in the scissors of Figure 4; e* Figures 6a to 6d show a second combination of tip configurations which can be used 0:6 in the scissors of Figure 4; oooo Figures 7a to 7d show the incorporation of a clamp in a pair of surgical scissors, and are respectively a plan view with the scissors closed, a plan view with the scissors open, a side view with the scissors closed, and a side view with the blades separated o•o eel• 00 for the sake of clarity, to show their construction; o.

Figure 8 shows a pair of scissors incorporating means for cauterisation; Figure 9 is a side view of a scalpel, incorporating both suction and cauterisation means; Figure 10 is a view taken at right angles to Figure 9, from the dorsal aspect of the scalpel showing the same scalpel, but with a forceps tip and metallic extension thereof omitted for clarity; RA Figure 11 illustrates a modified scalpel blade, seen from the non-cutting edge thereof; P.\OPER\DH\31209-99 RSI .DOC- 28/6/01 -4- Figure 12 is a side view of a suction/cautery unit provided with means for removably receiving a scalpel; Figure 13 is a section taken on line 13-13 in Figure 12; Figure 14 shows a further embodiment in the form of a pair of forceps provided with a blade holder; Figures 14a and 14b are cross sections through the forceps of Figure 14, on a larger scale, taken on lines A-A and B-B respectively; Figure 15 shows the forceps of Figure 14 in a view taken at right angles thereto; Figure 16 shows the forceps in the view of Figure 15, but with a blade in position; and 0.0 Figure 17 shows the forceps in a view at 1800 to that of Figure oooo Referring to Figures 1 to 3, there is shown a pair of surgical scissors 10 having members 12 and 14 which are connected by a pivot 16 and which have finger openings 18 and 20 respectively and blades 22 and 24 respectively.

The blade 24 can be conventional in construction, but the blade 22 has a tip portion 26 which is modified for the purposes of the present invention. One form of modified tip is shown on an enlarged scale in Figure 2, and an alternative form of tip is shown on a similar scale in Figure 3. The scissors are curved, as are the other examples of scissors described herein, and where any of the scissors are shown in plan view they are shown with the concave side facing the viewer. Alternatively, however, the scissors can be straight.

A suction tube 28, which is preferably of metal, though it could be of some other material, runs up one edge of the member 12. The tube may be an entity distinct from P.\OPER\DH3 1209-99 RSI.DOC 28/6/01 the member 12 and merely attached thereto, but it is preferably a tube which is implanted in the member 12. Such implantation could be achieved, for example, by forming a bore in the member 12 and inserting the tube lengthwise in it, or forming a recess in the back edge of the member 12 and inserting the tube into that. In the latter case the exposed portion of the tube might be covered, for example by solder material.

A further possibility would be not to have a separate tube 28 as such and rely on a bore in the member 12 to achieve the same effect. For simplicity of description, such a bore is regarded in the ensuing description as itself constituting a tube.

One end of the tube is attached to a flexible tube 30 which in turn is connected to a source of suction (not shown). The other end of the tube terminates in the tip 26, as is described below. The tube 28 has a short branch 32 which communicates with atmosphere via an orifice 34 located in the finger opening 18. The orifice 34 allows a small amount of air to enter the tube 28, and thus, when it is open, reduces the section effect applied at the tip 26. The surgeon can thus control the amount of applied suction by closing the orifice 34, or opening it wholly or partially, using that one of his fingers which is in the finger hole 18 (this being, under normal circumstances, the surgeon's thumb).

oo.: In the tip shown in Figure 2, at least one aperture 36 (three such apertures are shown, though there could be a greater or lesser number) extends through the blade from one face to the other. The upstream end 38 of the suction tube 28 is positioned adjacent one edge of the largest of the three apertures. The tip shown in Figure 2 provides a significant suction effect only when the scissors are at least partially closed, and control of the suction effect can therefore be achieved by opening and closing the scissors. Additional control, when the scissors are at least partially opened, can be achieved by opening and closing the orifice 34.

In the tip shown in Figure 3, a part-conical depression is formed in that surface of the tip which faces towards the viewer as seen in Figures 1 and 3, i.e. the surface which faces away from the blade 24. Suction is here controlled solely by means of the orifice 34.

P.\OPER\DH\31209-99 RSI.DOC 28/6/01 -6- Referring now to Figures 4, 5 and 6, in Figure 4, a pair of surgical scissors is denoted as having a blade 101 and a blade 102, with the cutting surfaces of the blades being denoted below using a suffix C (1C is the cutting surface of blade 101 and 2C is the cutting surface of blade 102), and exterior surfaces of the blades those which face away from one another) being denoted by the suffix E (with 1E denoting the exterior surface of blade 101 and 2E denoting the exterior surface of blade 102).

Figures 5a to 5d show one possible combination of these four surfaces. Surface 2C shown in Figure 5a has a part-conical recess 50, the larger end of which communicates with the upstream end 38 of the suction tube 28. From this it will be understood that in this embodiment the suction tube is provided in the blade 102. This can be seen more clearly in Figure 5c, which shows surface 2E. The surface 1C of blade 101 has a part-conical recess 52 which matches the recess 50 in surface 2C, except at the distal end, where a triangular aperture 54 extends through the blade and is thus visible also on surface 1E (see Figure 5b). Suction is applied by the scissors to the operating site via the aperture 54 when the scissors are at least substantially closed. When they are open it is applied via the grooves 50 and 52.

ooo* Figures 6a to 6d show an alternative set of surfaces which can be used. In this embodiment, the suction tube 28 is provided on blade 101, with its upstream end 38 opening into surface 1C shown in Figure 6d. This has the consequence that surface ,2E is a regular blade surface.

Figures 7a to 7d show how a pair of surgical scissors may be provided with means for clamping the patient's tissue. For simplicity, Figures 7a to 7d do not show any means for providing the scissors with suction. It is to be understood, however, that such suction means could be provided in the structure shown in Figures 7a to 7d, though suction means need not provided.

The scissors of Figures 7a to 7d are shown as having a pair of blades 201 and 202, with the tip of blade 202 having a clamp member 204 which, as considered in the view S of Figures 7c and 7d, overlaps the tip of the blade 201. The blade 201 has, at its tip, P:\OPER\DH\31209-99 RS I. DOC 28/6/01 -7a portion which is cut away to define a recesswith which the clamp portion 204 can mate, so that when the scissors are closed the face 206 which is thus formed on the blade 201, and which is visible in Figure 7d, bears against that face of clamp portion 204 which, as viewed in Figure 7d, is remote from the viewer.

Figure 8 shows the provision of a pair of surgical scissors with a cautery for effecting cauterisation. One terminal (it is illustrated as being the positive terminal, but it could altematively be the negative terminal) of an electrical supply is connected to a wire 304 which runs along one of the members 301 constituting the scissors (the other of the members is denoted by reference numeral 302) and terminates in a tip portion 306 which is electrically isolated from the remainder of the member 301. It will be understood that the wire 304 is insulated from the member 301 except where it is in electrical contact with the tip 306. The other wire 308 is electrically connected directly to the member 301, and indirectly to the member 302 through the pivot 16. A bipolar cautery is thus formed. If a unipolar cautery were desired, one of the wires 304 and 308 would be omitted, and the other connection would be made to the patient's body.

For ease of illustration Figure 8 does not show any means for providing suction to the scissors. It is to be understood, however, that such suction means might be provided, though they need not be. It is also to be understood that the cautery arrangement of Figure 8 could be combined with the clamp arrangement of Figures 7a to 7d, with or without a suction arrangement.

Figures 9 and 10 illustrate the form of a scalpel. This is provided both with means for providing suction, with clamping means, and with a cauter&. The scalpel comprises a handle 400 having blade holder 401 which carries a blade 402. The blade has a cutting edge 404 and non-cutting edge 406. A suction tube 408 runs along the lower edge of the handle, and thence along one face of the blade 402, to terminate in a suction tip 410. The suction tip faces towards the adjacent face of the blade 402, as can be seen in Figure 10. The downstream end of the tube 408 is connected to a flexible tube 410 which, in turn, is connected to a source of suction (not shown).

RA A forceps tip 412 is positioned above, but normally spaced from, the non-cutting edge forceps tip 412 is positioned above, but normally spaced from, the non-cuffing edge P:\OPER\DH3 1209-99 RS I.DOC 28/6/01 -8- 406 of the blade 402. The forceps tip 412 is electrically isolated from the handle 400, on which it is mounted. The forceps tip is made of a flexible material, for example spring steel, and can thus be pressed resiliently towards the edge 406, to clamp tissue, for example a piece of tissue which is bleeding, between the forceps tip and the edge 406. The forceps tip 412 is connected via a metallic extension 414 (which is electrically isolated from the handle 400) to one pole of an electrical supply (here shown as the positive pole). The handle 400, and hence the blade 402, is connected to the other pole, here shown as the negative pole. Accordingly, when bleeding tissue is clamped, as described above, it is subjected to a cauterising action by the electrical current which passes through it, being clamped while cauterisation is taking place.

Figures 9 and 10 illustrate a bipolar cautery, but a unipolar cautery could be produced by omitting one or other of the electrical connections, and making that connection to the patient's body.

.Figure 11 illustrates a modified scalpel blade, in which the tip thereof has a triangular piece 416 formed thereon. The piece 416 can be a separate item which is secured to **the blade by suitable means, or it can be formed integrally therewith in the course of manufacture of the blade. The forceps tip preferably has a triangular piece formed at its distal end which is identical in shape and size to the triangular piece 416 formed on the blade.

Figures 12 and 13 show a combined suction/cautery unit 500. This comprises a suction tube 502 made, for example, from metal or a plastics material, to which is secured a forceps member 504 made of metal. The forceps member 504 is resiliently flexible and can be urged towards the tube 502. One terminal 506 of an electrical power supply is electrically connected to the forceps member 504. The other pole is connected to the suction tube 502 if the latter is of conductive material (in which case the tube and forceps member must be electrically isolated from one another) or, if the tube is not of conductive material, a conductive wire extends through the tube from the A~p ole, to emerge at the tube exit 510. The other end of the tube 502 is connected to Rsuction source (not shown).

P.\OPER\DHU 1209-99 RSI.DOC- 28/6/01 -9- A plurality of U-shaped guides 512 extend from the tube 502 in a direction away from the forceps member 504. The guides are aligned with one another, and define aligned openings 514 in which a surgical scalpel (not shown) can be received, preferably so as to be removable. In this way the surgeon has the option of using the scalpel alone, or combined with the suction and/or cautery unit, depending on the particular operation. Alternatively, the suction/cautery unit can be used without the scalpel. The suction/cautery unit is sufficiently simple that it should be economical for it to be manufactured, if desired, as a disposable item.

Figures 14 to 17 show the form of forceps 600 comprising first and second forceps arms 601 and 602 which are movable resiliently towards one another. The second forceps arm 602 has a recessed area 603 in which is mounted a blade holder 604.

This is of a shape to be received in a slot 605 of a surgical blade 606.

9 The forceps arm 601 is provided with a suction tube 607 formed or implanted therein, which can be connected at the proximal end to a source of reduced pressure and which terminates at the distal end in an open tip 608.

*go9 The proximal end of the forceps carries an arm housing 610 made of plastics or other insulating material. (The housing 610 is drawn as though it were transparent, so that structures within it are visible). The forceps arms 601 and 602 are held therein in fixed position and in electrical isolation from one another. Portions 601a and 602a are exposed for electrical connection to respective poles of a bipolar electrical power supply which enables the distal tips of the forceps members to act as a cautery.

Alternatively, only one of the forceps arms would have an electrical connection made to it, for use in unipolar cauterisation.

The embodiment of Figures 14 to 17 can thus be used as a pair of forceps and as a cutting tool, to which both suction and cauterisation can be applied. If in any particular R situation it is desired not to use its cutting function the blade 606 can simply be 1 omitted.

P:\OPER\DH\31209-99 RSI.DOC- 2816101 It should be noted that various of the features described above may be used without a means for applying suction being provided. For example, the surgical cutting tool may be provided with the clamping and/or cauterisation features without suction, and a combined forceps/scalpel unit may be provided without suction. Also, the suction and clamping features may be combined in a tool which is not a cutting tool, i.e. as in Figures 12 and 13, but without the scalpel guide means.

Throughout this specification and the claims which follow, unless the context requires otherwise, the word "comprise", and variations such as "comprises" and "comprising", will be understood to imply the inclusion of a stated integer or step or group of integers o or steps but not the exclusion of any other integer or step or group of integers or steps.

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Claims (3)

1. A pair of surgical scissors comprising first and second blades each having a cutting surface and an exterior surface, the cutting surfaces facing one another, the blades being pivotally connected to one another for relative pivotal movement about a pivotal axis, one of the blades having a distal blade portion electrically insulated from the remainder of the blade, a first electrical conductor electrically connected to the said distal blade portion, and a second electrical conductor electrically connected elsewhere on the scissors, thereby enabling the scissors to act as a cautery.

2. A pair of scissors according to claim 1, wherein the said blade portion is at the distal extremity of the blade in which it is located. .o A pair of scissors according to claim 1, wherein the said blade portion is located S only on one edge of the blade in which it is located.

4. A pair of scissors, substantially as hereinbefore described with reference to the drawings. DATED this 28th day of June, 2001. S. Hagop Samuel Manushakian AND Martin Christopher Wisselberg DAVIES COLLISON CAVE Patent Attorneys for the Applicant