AUSTRALIA S&F Ref: 754600D2 PATENTS ACT 1990 COMPLETE SPECIFICATION FOR A STANDARD PATENT Name and Address Tyco Healthcare Group, LP, of Mail Stop: 8 N-1, 555 of Applicant: Long Wharf Drive, New Haven, Connecticut, 06511, United States of America Actual Inventor(s): Laszlo Csiky Address for Service: Spruson & Ferguson St Martins Tower Level 35 31 Market Street Sydney NSW 2000 (CCN 3710000177) Invention Title: Circular stapler for hemorrhoid operations The following statement is a full description of this invention, including the best method of performing it known to me/us: 5845c(6120629_1) 1 CIRCULAR STAPLER FOR HEMORRHOID OPERATIONS FIELD The present disclosure relates to a circular stapler for hemorrhoid operations. More specifically, the present disclosure relates to a modified circular stapler for simplifying in hemorrhoidal operations the process of pulling prolapsed hemorrhoidal and/or mucosal tissues into the stapling head. BACKGROUND A circular stapler (HCS33) has recently been made public which is suitable for hemorrhoid operations and shows extraordinarily good results. During its use, however, there arise several technical difficulties, as for example: the difficulty of pulling the suture or thread through the lateral holes of the stapler head, or the repeated knotting of the ends of the suture or thread. As a result, the instrument after having already been set, repeatedly moves out of place or temporarily releases. Accordingly, there has arisen a need for a modified circular stapler which eliminates the above-mentioned technical difficulties which occur during hemorrhoidal operations. OBJECT OF THE INVENTION It is the object of the present invention to substantially overcome or ameliorate one or more of the disadvantages of the prior art, or to at least provide a useful alternative. SUMMARY There is disclosed a circular stapler for performing hemorrhoidal operations, the stapler comprising: an anvil, a stapler head and a body that communicates with the stapler head, the anvil being supported on a shaft and being movable in relation to the stapler head between open and closed positions, wherein the stapler includes a ring which is arbitrarily displaceable along the shaft, and a displacing member including a thread or wire having a first end secured to the ring and a second end extending through the body of the stapler such that the second end of the la displacing member is positioned externally of the body, the displacing member being movable to arbitrarily displace the ring along the shaft, the ring being configured, dimensioned, and adapted such that movement of the ring away from the anvil draws tissue into the stapler head. There is also disclosed a circular stapler for performing hemorrhoidal operations, the stapler comprising: an anvil, a stapler head and a body that communicates with the stapler head, the anvil being supported on a shaft and being movable in relation to the stapler head between open and closed positions, wherein the stapler includes a ring which is arbitrarily displaceable along the shaft, and a displacing member including a thread or wire having a first end secured to the ring and a second end extending through the body of the stapler, the displacing member being movable to arbitrarily displace the ring along the shaft. There is also disclosed herein a circular stapler for performing hemorrhoidal operations, the stapler comprising: an anvil and a stapler head, the anvil being supported on a shaft and being movable in relation to the stapler head between open and closed positions, wherein the stapler includes at least one displacing rod, each of the at least one displacing rods having a first end provided with a hole or hook configured to engage a suture and a second end extending through a body of the stapler. Preferably, the second end of each of the displacing rods is provided with a displacing button. Preferably, the body of the stapler includes at least one longitudinal slot, the second end of each of the at least one displacing rod extending through a respective one of the at least one longitudinal slot such that the respective one of the at least one longitudinal slot guides movement of the displacing button. Preferably, the stapler includes a rotatable locking component for locking the displacing button in a fixed position. Preferably, the at least one displacing rod includes two displacing rods, each of the displacing rods being independently and arbitrarily moveable along the shaft.
lb Preferably, one or more of the displacing rods is at least partially embedded in the shaft. There is also disclosed herein a circular stapler for performing hemorrhoidal operations, the stapler comprising: an anvil and a stapler head, the anvil being supported on a shaft and being movable in relation to the stapler head between open and closed positions, wherein the stapler includes a ring which is arbitrarily displaceable along the shaft, and a displacing member having a first end connected to the ring and a second end extending through a body of the stapler, the displacing member being movable to arbitrarily displace the ring along the shaft independent of movement of the anvil in relation to the stapler head, wherein the body of the stapler includes a longitudinal slot, the second end of the displacing member extending through the longitudinal slot such that the longitudinal slot guides movement of the displacing button, and the stapler includes a locking slot for locking the displacing member in a fixed position. There is also disclosed herein a circular stapler for performing hemorrhoidal operations, the stapler comprising: an anvil and a stapler head, the anvil being supported on a shaft and being movable in relation to the stapler head between open and closed positions, wherein the stapler includes a ring which is arbitrarily displaceable along the shaft, and a displacing member having a first end connected to the ring and a second end extending through a body of the stapler, the displacing member being movable to arbitrarily displace the ring along the shaft, wherein the body of the stapler includes a longitudinal slot, the second end of the displacing member extending through the longitudinal slot such that the longitudinal slot guides movement of the displacing button, and the stapler includes a locking slot for locking the displacing member in a fixed position 2 BRIEF DESCRIPTION OF THE DRAWINGS Various embodiments of the presently disclosed circular stapler for hemorrhoid operations are disclosed herein with reference to the drawings, wherein: FIG. 1 is a side elevational view with parts separated of the distal portion of one embodiment of the presently disclosed circular stapler; FIG. IA is a side elevational view of a displacing rod having a connecting component and button of the circular stapler shown in FIG. 1; FIG. 2 is a side elevational view of the distal portion of a second embodiment of the presently disclosed circular stapler; FIG. 2A is a side elevational view of a displacing rod having a ring and button of the circular stapler shown in FIG. 2; FIG. 3 is a side elevational, partial cross-sectional view with parts separated of the distal portion of a third embodiment of the presently disclosed circular stapler; FIG. 4 is a side, elevational view of the distal portion of a fourth embodiment of the presently disclosed circular stapler; and FIG. 4A is a cross-sectional view as would be seen through the shaft with displacing rods slidably mounted or embedded therein according to an alternate embodiment of the circular stapler shown in FIG. 4; and FIG. 4B is a cross-sectional view as would be seen through the shaft with displacing rods slidably mounted or embedded therein according to another alternate embodiment of the circular stapler shown in FIG. 4. DETAILED DESCRIPTION OF EMBODIMENTS Embodiments of the presently disclosed circular stapler will now be described in detail with reference to the drawings in which like reference numerals designate identical or corresponding elements in each of the several views. Referring to FIG. 1, the presently disclosed circular stapler includes an anvil 1 and a stapling or stapler head 10. Anvil I is movably supported in relation to stapler head 10 in a known manner between open and closed positions. Stapler head 10 supports a plurality of staples (not shown). The stapler is operable in a known manner to eject the staples from stapler head 10 into or against anvil 1. The stapler also includes a knife (not shown) which is movable in a known manner from within stapler head 10 towards anvil 1 to cut tissue positioned between anvil I and stapler head 10. As can be seen in FIG. 1, a ring 3 can be slid freely along the disassemblable shaft that includes a pin 2 of anvil 1 and a sheath 6 of stapler head 10. The disassemblable 3 shaft connects anvil 1 to the stapler. At the upper edge of ring 3 there is an arbitrarily arrangeable flange 4 which is used to hang up or engage a purse-string suture. At a lower edge of ring 3 there can be a connectable rim 5 which makes it possible to connect ring 3 to a displacing member, e.g., a connectable displacing tube 7 or a displacing rod 13. Displacing tube 7 is situated outside sheath 6. At the upper end of displacing tube 7 or the displacing rod 13, there is a hangable hook 8. At a lower end of displacing tube 7 or displacing rod 13, there is a displacing button 9. On neck 11 of the stapler there is a slot 12 which is longitudinally arranged. FIG. IA shows displacing rod 13 having displacing button 9 on a proximal end and a connecting component in the form of a hangable hook 8 on a distal end. As can be seen in FIG. 2, the pin and the sheath are integrally formed as a shaft 16 which is not disassemblable. Shaft 16 is surrounded by an independent displacing tube 15, at whose lower end is displacing button 9 and at whose upper end is flange 4. The displacing tube or displacing rod forms a rigid unit with the ring and surrounds shaft 16. The upper end of longitudinal slot 12 is arranged on neck 11 of the stapler and includes an angled continuation which forms a locking slot 17 for receiving displacing button 9. FIG. 2A shows displacing rod 18, which forms a rigid unit with ring 3. As can be seen in FIG. 3, a displacing member including a thread or wire 19 at its proximal end having a circlet 20 can be connected to ring 3, which is freely movable along the disassemblable shaft defined by pin 2 and sheath 6. On neck 11 of the stapler, there is arranged through a hole 21 through which thread or wire 19 extends from neck 11 and is movable. As can be seen in FIG. 4, the pin and the sheath are formed as an integral shaft 16 which is not disassemblable. Ring 3 is replaced by one or more or motive sticks or displacing rods 23, each of which is provided with a hook 22 or advantageously with a hole 24. At a lower end of each displacing rod 23, there is a displacing button 9. Displacing rod 23 runs beside shaft 16 or, alternatively, is slidably embedded into shaft 16 (FIG. 4A). Longitudinal slot 12 is arranged on neck 11 of the stapler and has at its upper end a component 14 which is rotatable about neck 11 to lock displacing button 9 in a position in relation to neck 11. Displacing button 9, together with displacing rod 23, can be arbitrarily moved in slot 12. The operation of the mechanism in accordance with the invention is the following: After placing an inner purse-string suture in the rectum, anvil I is introduced into the rectum. Anvil I can be dish-shaped. Ring 3 slides freely on pin 2 of anvil 1. The 4 purse-string suture is fixed with a knot to or on the body of ring 3 under arbitrarily arrangeable flange 4. Next, pin 2 is connected to sheath 6 and displacing tube 7 is connected to connecting rim 5 using the hangable hooks 8. Alternately, displacing tube 7 may be replaced by the displacing rod 13. Prior to operation, displacing button 9 is positioned at the upper end of slot 12. Displacing button 9 can now be pulled downward to pull the hemorrhoidal tissues attached by the purse- string suture to ring 3 downward, into the interior of stapling head 10. Next, the stapler can be closed and actuated in a manner which in and of itself is well known. According to another possible solution, thread or wire 19 having a ring or circlet 20 is connected to ring 3 (See FIG. 3). Thread 19 is pulled through hole 21 arranged on neck I1 of the stapler, to pull down ring 3 together with the hemorrhoidal tissues attached thereto via the purse- string suture. Insofar as the stapler has unified shaft 16 for the pin and sheath, an independent displacing tube 15, or a displacing rod 18 which forms a rigid unit with ring 3 can be used. Displacing button 9 can be placed into locking slot 17 or locked by means of locking component 14 (which may advantageously be a rotatable ring), while the head 10 of the stapler is pushed or inserted into the rectum and the knot of the suture is positioned under flange 4 of ring 3. After this, displacing button 9 is moved into longitudinal slot 12, or locking component 14 is rotated to unlock displacing button 9. Displacing button 9 can now be pulled downward. The remainder of the procedure is similar to what has been described above. As a possible variation, instead of using ring 3, a displacing rod 23 which at its end is provided advantageously with a hole 24 and/or with a hook 22. Its use is similar to what has been described above, i. e. , the purse-string suture is fixed through hole 24 or under the hook 22. Displacing rod 23 is positioned along or beside shaft 16. Alternately, displacing rod 23 may be embedded into shaft 16 (FIG. 4A). Insofar as the stapler has a plurality of displacing rods 23, e. g. , two such rods, two half purse-string sutures independent of each other can be attached to the ends of the two separate displacing rods 23, each of which is provided with a hole 24 or a hook 22. As such, there is obtained the possibility of pulling displacing rods 23 to different degrees to pull the prolapsed hemorrhoidal cushion portions that have become loosened to different degrees into stapler head 10 and thereby facilitate and obtain differentiated excision of the different hemorrhoidal cushioned portions. The displacing rods 23 can be 5 pulled different distances to provide an excision which is proportional to the loosening of the respective hemorrhoidal tissue portions. An important advantage of the solutions in accordance with an embodiment or embodiments of the invention is that in the event of hemorrhoidal operations using a stapler of the invention, it ensures that the operating technology or technique is simplified, that the instrument's moving out of place or releasing is eliminated, and that the excision will be proportional to the loosening of the respective hemorrhoidal tissues.