JP2007144012A - Ultrasonic surgical instrument and vibration absorbing tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ultrasonic surgical instrument which can more easily reduce or restrain unnecessary vibrations. <P>SOLUTION: A vibration absorbing tool 42 is mounted in the position equivalent to a node portion of a vibration as a required vibration of a horn 40. The vibration absorbing tool 42 has elastic annuluses 52 which hold the external surface of the horn 40 in the node portion of the vibration, and a stiff cylindrical body 50 which is arranged in the space between the outside periphery of the horn 40 and butts against the outside periphery of the elastic annuluses 52. The vibration absorbing tool 42 functions as a so-called balancer and absorbs a transverse vibration as an unnecessary vibration. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an ultrasonic surgical apparatus that uses ultrasonic waves to crush tissue at a surgical site, and a vibration absorber that absorbs unnecessary vibration generated in a vibration transmission member of the ultrasonic surgical apparatus.

  2. Description of the Related Art Conventionally, an ultrasonic surgical apparatus for incising and crushing a living tissue using ultrasonic vibration is widely known. The ultrasonic surgical apparatus includes a vibration generating unit including an ultrasonic transducer, and a thin and long vibration transmitting member connected to the vibration generating unit. The vibration generating unit is covered with a case or the like, and becomes a gripping unit that is gripped by the user. The vibration transmitting member transmits a predetermined vibration generated in a vibration generating unit connected to the rear end to the front end side. The distal end portion of the vibration transmitting member becomes a treatment portion that performs incision / crushing of the living tissue.

  In such an ultrasonic surgical apparatus, it is desirable that only desired vibration is transmitted to the treatment portion of the vibration transmitting member. However, in the initial stage or process of transmission, vibrations other than desired vibrations, that is, unnecessary vibrations often occur. In particular, unnecessary vibrations are likely to occur when the vibration transmitting member is bent in order to secure the surgical field of view.

  Such unnecessary vibration causes a reduction in transmission efficiency of desired vibration. Therefore, many techniques for reducing or suppressing unnecessary vibration have been proposed. For example, Patent Document 1 discloses a technique in which a vibration damping member is arranged in a position corresponding to a desired vibration node inside a vibration transmission member.

  Further, in Patent Document 2, a sheath that covers almost the entire length of the vibration transmission member is provided, and a convex portion is formed on the inner peripheral surface of the sheath for pressing a position corresponding to a desired vibration node of the vibration transmission member. Technology is disclosed. Patent Document 2 describes that the sheath is formed of a composite layer including an outer layer of stainless steel and an inner layer made of a material having a low friction coefficient such as silicone or Teflon (registered trademark).

  Further, Patent Documents 3 and 4 disclose a technique in which some damping member is provided at a position corresponding to the antinode portion of unnecessary vibration.

JP 2002-143772 A Japanese National Patent Publication No. 8-509628 JP 2002-143772 A JP-A-2005-103015

  However, these conventional techniques have problems that it is difficult to actually carry out or that the function of the ultrasonic surgical apparatus is reduced. For example, the technique described in Patent Document 1 has a problem in that unnecessary vibration can be reduced, but a crushed tissue cannot be sucked. That is, the internal space of the vibration transmitting member that is a tubular member functions as a suction path for sucking the crushed tissue. Providing a vibration damping member in the internal space of the vibration transmitting member hinders tissue suction and reduces the function of the ultrasonic surgical apparatus.

  According to the technique described in Patent Literature 2, since the outside of the vibration transmission member is pressed, tissue suction can be achieved using the internal space of the vibration transmission unit. However, with this technique, the space between the sheath and the vibration transmitting member is divided by the convex portion, and there is a problem that it is impossible to supply a cleaning solution such as physiological saline using the space. Further, when the vibration transmitting member is bent halfway, there is a problem that it is difficult to manufacture the above-described sheath. Furthermore, the techniques described in Patent Documents 3 and 4 have a problem that it is difficult to specify the abdomen of unnecessary vibration.

  Therefore, an object of the present invention is to provide an ultrasonic surgical apparatus and a vibration absorber that can reduce or suppress unnecessary vibration more easily.

  An ultrasonic surgical apparatus according to the present invention includes a vibration transmission member that transmits a desired vibration generated by a vibration generation source provided on a rear end side to a treatment portion on a distal end side, and a desired vibration of the vibration transmission member. A vibration absorbing member that is provided at a position corresponding to the node portion and absorbs unnecessary vibration generated in the vibration transmitting member, and the vibration absorbing member is made of an elastic material, and at a position corresponding to a node portion of a desired vibration. An elastic member that holds down the outer peripheral surface of the vibration transmitting member, and a rigid member that is made of a rigid material and is disposed with a gap between the outer peripheral surface of the vibration transmitting member and abuts on the outer peripheral surface of the elastic member; It is characterized by having.

  According to a preferred aspect, there is further provided a cover body that covers the vibration transmission member over substantially the entire length with a gap between the outer peripheral surface of the vibration transmission member and the outer peripheral surface of the rigid member. In this case, it is desirable that a position restricting member for restricting the position of the vibration transmitting member in the internal space of the cover body is provided between the rigid member and the cover body. And it is desirable that a plurality of position restricting members are provided on the outer peripheral surface of the rigid member and are convex portions that come into contact with the inner peripheral surface of the cover body.

  In another preferred aspect, a convex portion or a concave portion that fixes the position of the elastic member is formed on the outer peripheral surface of the vibration transmitting member. In another preferred aspect, a convex portion or a concave portion for fixing the position of the rigid member is formed on the outer peripheral surface of the vibration transmitting member, and the position of the rigid member is set on the inner peripheral surface of the rigid member. A concave portion or a convex portion corresponding to the convex portion or the concave portion for fixing is formed.

  In another preferred aspect, the elastic member includes a first elastic member having a notch, and the rigid member is fixed in position by fitting an end of the rigid member into the notch. In this case, the vibration transmitting member has a stepped portion in the vicinity of the node so that the node has a small diameter, and the rigid member has one end fitted into the notch and the other end is the stepped portion. The position is fixed by coming into contact with.

  When the vibration transmitting member is bent, the bent portion is preferably provided on the rear end side from the desired vibration node.

  Another vibration absorber according to the present invention is a vibration absorber that absorbs unnecessary vibration generated in the vibration transmission member of the ultrasonic surgical apparatus, and is made of an elastic material, at a position corresponding to a desired vibration node, An elastic member that presses the outer peripheral surface of the vibration transmitting member, and a rigid member that is made of a rigid material and is arranged in a state of being interposed between the outer peripheral surface of the vibration transmitting member and abutting the outer peripheral surface of the elastic member; It is characterized by having.

  According to the present invention, the elastic member that directly contacts the vibration transmitting member and the rigid member that does not directly contact the vibration transmitting member function as a balancer and absorb unnecessary vibration. Therefore, unnecessary vibration can be reduced or suppressed with a simple configuration.

  Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of an ultrasonic surgical apparatus 10 according to an embodiment of the present invention. FIG. 2 is a side view of the handpiece 12 which is a main component of the ultrasonic surgical apparatus.

  The ultrasonic surgical apparatus 10 generates longitudinal vibration with an ultrasonic vibrator provided inside the handpiece 12. This longitudinal vibration is transmitted to the distal end portion of the horn 40 that is a vibration transmitting member, and the biological tissue is incised or broken by the longitudinal vibration transmitted to the distal end portion. The horn 40 is a hollow elongated tube body as will be described in detail later. The internal space of the horn 40 becomes a suction path for sucking the crushed tissue and the like.

  That is, the horn 40 is connected to the suction pump 24 via the suction tube 34 connected to the rear end of the handpiece 12, and suction of the crushed tissue or the like is realized by the suction pump 24. The pressure during this suction is monitored by the pressure control mechanism 22. The pressure control mechanism 22 appropriately controls the driving of the suction pump 24 according to the monitored pressure value or the like. The aspirated tissue and the like are accumulated in the aspirated container 20.

  As shown in FIG. 2, the horn 40 is covered with a horn cover 38 that is a tube having a larger diameter than the horn 40. A gap formed between the horn cover 38 and the horn 40 functions as a supply path for supplying a cleaning solution such as a physiological saline to the surgical site.

  That is, a supply tube 32 for supplying the cleaning liquid is connected to the gap between the horn cover 38 and the horn 40. The other end of the supply tube 32 is connected to the tank 14 in which the cleaning liquid is stored. The cleaning liquid is pumped up by the cleaning pump 16 and supplied to the gap between the horn 40 and the horn cover 38 via the supply tube 32. The pump control circuit 18 appropriately controls the driving of the cleaning pump 16 so that a desired amount of cleaning liquid can be supplied. The supplied cleaning liquid further flows out from the vicinity of the tip of the horn 40 through the gap between the horn 40 and the horn cover 38.

  That is, the ultrasonic surgical apparatus 10 of the present embodiment can perform incision and crushing of a biological tissue using longitudinal vibration generated by an ultrasonic transducer, and at the same time, supply of a cleaning liquid and suction of the crushed tissue. It can be done.

  Next, the configuration of the handpiece 12 will be described in detail with reference to FIG. The handpiece 12 is roughly divided into a main body portion 29 and a transmission portion 35. The main body 29 includes an ultrasonic transducer that is a source of longitudinal vibration, and a control circuit (both not shown) that controls driving of the ultrasonic transducer. The ultrasonic transducer and the control circuit are accommodated in the case 30. The operator grasps the main body 29 and performs ultrasonic surgery. That is, the main body 29 also functions as a gripping part that the operator grips.

  In the transmission unit 35, the horn 40 functions as a transmission member that transmits the longitudinal vibration generated by the ultrasonic transducer, and the distal end thereof serves as a treatment unit that performs crushing and incision of living tissue. Longitudinal vibration is gradually amplified in the process of transmitting the horn 40, and the tip of the horn 40 has sufficient power for breaking the living tissue.

  As is apparent from FIG. 2, the horn 40 of the present embodiment is bent at a predetermined angle. By such bending, a visual field at the time of surgery can be sufficiently secured, and operability can be further improved. On the other hand, it is known that by applying such bending, vibration other than desired vibration, specifically, lateral vibration is likely to occur. When lateral vibration, which is unnecessary vibration, occurs, the transmission efficiency of ultrasonic vibration (longitudinal vibration) from the ultrasonic vibrator to the surgical site is reduced, which in turn causes problems such as excessive power consumption.

  Therefore, in the present embodiment, the vibration absorber 42 is attached to the horn 40 in order to reduce or suppress unnecessary vibration. As will be described in detail later, the vibration absorber 42 is attached to a position corresponding to a longitudinal vibration node of the horn 40. The vibration absorber 42 has a smaller diameter than the inner diameter of the horn cover 38. Therefore, a space as a supply path for supplying the cleaning liquid is surely secured.

  As described above, the horn cover 38 is a tubular body having a diameter larger than the outer diameter of the horn 40 and covers the horn 40 over almost the entire length. However, the distal end portion of the horn 40 as a treatment portion is designed to have a length that can protrude from the horn cover 38. The horn cover 38 is also bent according to the bending of the horn 40.

  Next, the attachment position of the vibration absorber 42 will be described with reference to FIG. FIG. 3 is a diagram showing the mounting position of the vibration absorber 42 in the horn 40, and the lower part of FIG. 3 schematically shows the amplitude of longitudinal vibration (desired vibration). As apparent from FIG. 3, the longitudinal vibration transmitted to the rear end of the horn 40 reaches the maximum amplitude (abdominal portion of the amplitude) at the front end portion 40b of the horn 40 after passing through the node C where the amplitude becomes zero. . The vibration absorber 42 is provided at a position corresponding to the node C of the longitudinal vibration. By providing the vibration absorber 42 at the longitudinal vibration node C, it is possible to reduce or suppress lateral vibration, which is unnecessary vibration, without affecting the desired longitudinal vibration. The node C is designed to be on the tip side from the bent portion of the horn 40.

  Next, the configuration of the vibration absorber 42 will be described with reference to FIG. 4 is a cross-sectional view taken along line YY in FIG. The vibration absorber 42 includes an annular elastic ring body 52 that is pressure-bonded to the outer surface of the horn 40, and a cylindrical rigid cylinder body 50 that covers the elastic ring body 52. The elastic ring body 52 is specifically a rubber ring such as an O-ring. The elastic ring body 52 is pressure-bonded to the outer periphery of the horn 40 so as to hold a position corresponding to the vibration node C of the horn 40. In the present embodiment, two elastic ring bodies 52 are provided, and are arranged at a certain distance in the major axis direction around the vibration node C. However, the number of the elastic ring bodies 52 is not particularly limited, and may be one or three or more. In the illustrated example, the cross-sectional shape of the elastic ring body 52 is circular. However, other shapes such as a rectangular shape or an L-shape may be used.

  In addition, the recessed part 56 for fixing the position of the said elastic ring body 52 is formed in the outer peripheral surface of the horn 40 in the arrangement position of the elastic ring body 52 mentioned above. The elastic ring body 52 is disposed in the concave portion 56, so that the positional deviation is prevented.

  The rigid cylinder 50 is a cylindrical member having a size capable of covering the two elastic ring bodies 52. The rigid cylinder 50 is made of a material that is more rigid than the elastic ring body 52, such as a resin or a metal. The inner diameter of the rigid cylinder 50 is slightly smaller than the outer diameter of the elastic ring body 52 and sufficiently larger than the outer diameter of the horn 40. Therefore, when the rigid cylindrical body 50 is inserted to a position corresponding to the vibration node C of the horn 40, the rigid cylindrical body 50 is in close contact with the elastic ring body 52 and between the outer surface of the horn 40. A certain gap is generated in. In other words, the rigid cylinder 50 is maintained in contact with the elastic ring body 52 but not in contact with the horn 40.

  By providing the vibration absorber 42 having the above-described configuration at a position corresponding to the vibration node C of the horn 40, lateral vibration, which is unnecessary vibration, is greatly reduced or suppressed. That is, the elastic ring body 52 that is crimped to the horn 40 and the rigid cylindrical body 50 that does not contact the horn 40 function as a balancer, so that the longitudinal vibration node C of the horn 40 stops the lateral vibration, which is an unnecessary vibration, so as to be stationary. Absorb. As a result, the transmission efficiency of longitudinal vibration, which is a desired vibration, can be improved, and the efficiency of crushing and incising living tissue can be improved.

  At this time, the outer diameter of the rigid cylinder 50 is smaller than the inner diameter of the horn cover 38. Therefore, a gap can be secured between the horn cover 38 and the rigid cylinder 50, and the cleaning liquid can be supplied using the gap.

  Here, the vibration absorber 42 is attached to the horn 40 by being inserted from the tip 40b of the horn 40 to a position corresponding to the node C. At this time, as described above, the node portion C is designed to be positioned on the tip side from the bent portion of the horn 40. Therefore, the rigid cylinder 50 does not pass through the bent portion in the process of mounting the vibration absorber 42. As a result, the inner diameter of the rigid cylinder 50 can be reduced. That is, when the bent portion is positioned on the tip side from the node C, the rigid cylindrical body 50 passes through the bent portion in the process of mounting the vibration absorber 42. In this case, it is necessary to increase the diameter of the rigid cylinder 50 to such an extent that it can pass through the bent portion. As a result, there arises a problem that a sufficient gap is not ensured between the rigid cylinder 50 serving as a cleaning liquid supply path and the horn cover 38, or the entire transmission part 35 has a large diameter and the surgical visual field is limited. On the other hand, by setting the node C to the tip side from the bent part as in the present embodiment, the vibration absorber 42 can reach the node C without going through the bent part. As a result, the diameter of the entire transmission section 35 can be further reduced and a sufficient cleaning liquid supply path can be secured.

  As is clear from the above description, according to the present embodiment, unnecessary vibration generated in the horn 40 that is a transmission member can be more reliably reduced or suppressed without deteriorating the function of the ultrasonic surgical apparatus 10.

  Next, a second embodiment will be described with reference to FIG. FIG. 5 is a side view of the horn 40 in the vicinity of the vibration node C where only the vibration absorber 42 is shown in cross section. In this embodiment, a first recess 56 for fixing the position of the elastic ring body 52 is formed in the vicinity of the vibration node C of the horn 40, as in the above-described embodiment. By disposing the elastic ring body 52 that is an O-ring in the first recess 56, the position of the elastic ring body 52 is fixed.

  Further, the horn 40 is further formed with a second recess 60 for fixing the position of the rigid cylinder 50. The second recess 60 is provided on the distal end side from the position where the elastic ring body 52 is disposed. Further, before and after the second recess 60, a flat portion 61, which is a portion having an outer diameter of a predetermined size φb, is provided.

  On the other hand, a protrusion 62 is formed on the inner surface of the rigid cylinder 50 so as to face the second recess 60. An inner diameter φc of the rigid cylindrical body 50 in the protrusion 62 is larger than an outer diameter φa of the horn 40 in the second recess 60. Therefore, when the protrusion 62 and the second recess 60 are disposed to face each other, a gap is formed between them. Further, the difference between the inner diameter φc of the rigid cylindrical body 50 in the projecting portion 62 and the outer diameter φb of the horn 40 in the flat portion 61 is about a general shaft fitting amount. Therefore, the rigid cylindrical body 50 inserted into the horn 40 from the front end side can reach the position where the protruding portion 62 faces the second recessed portion 60 by utilizing this slight fitting amount. And the rigid cylinder 50 which reached the position where the projection part 62 opposes the 2nd recessed part 60 using fitting amount is controlled by the said position. As shown in FIG. 5, the outer diameter φd of the horn 40 up to just before the flat portion 61 is formed by forming a taper or the like at a position on the tip side from the flat portion 61. It is desirable to make the diameter sufficiently smaller than the inner diameter φc. Contrary to the present embodiment, a protrusion may be provided on the outer surface of the horn and a recess may be provided on the inner surface of the rigid cylinder to prevent the rigid cylinder from being positioned and prevented from falling off.

  In the present embodiment, the material of the rigid cylinder 50 is a metal such as stainless steel or titanium, or a resin, the inner diameter thereof is 4.7 mm, and the inner diameter φc of the protrusion 62 is about 4.2 mm. The elastic ring body 52 is made of fluorine rubber, silicon, or the like, and has an inner diameter of 3.0 mm and a cross-sectional diameter of 0.8 mm (therefore, the outer diameter of the elastic ring body 52 is 4.6 mm). . The outer diameter φa of the second recess 60 of the horn 40 is 3.8 mm, the outer diameter φb before and after the second recess 60 is about 4.2 mm, and the outer diameter φd of the horn 40 until just before the flat portion 61 is 3.0 mm. The outer diameter of the recess 56 is about 3.4 mm (the depth of the recess 56 is about 0.4 mm), which is slightly larger than the inner diameter (3.0 mm) of the elastic ring body 52. The elastic ring body 52 disposed in the concave portion 56 is elastically deformed in the direction in which the inner diameter increases, and is in close contact with the outer surface of the horn 40 by the elastic restoring force generated at that time. In addition, the material and dimension of each part described here are examples, and can be changed suitably.

  Also in this embodiment, the vibration absorber 42 composed of the elastic ring body 52 and the rigid cylinder 50 functions as a balancer and can sufficiently reduce or suppress unnecessary vibration generated in the horn 40. At that time, the function of supplying the cleaning solution is not hindered. Furthermore, according to this embodiment, since the second concave portion 60 and the projection 62 for fixing the position of the rigid cylinder 50 are provided, the displacement of the rigid cylinder 50 is prevented, and unnecessary vibration is always reduced. Deterrence can be achieved.

  Next, a third embodiment will be described with reference to FIG. 6A is a schematic perspective view of the rigid cylindrical body 50 in the third embodiment, and FIG. 6B is a transverse sectional view of the transmission portion 35 in the vicinity of the vibration node C. FIG.

  In this embodiment, the rigid cylinder 50 of the vibration absorber 42 is formed with a position restricting portion 64 that is a plurality of protrusions on the outer surface thereof. All of the plurality of position restricting portions 64 have a uniform height. The distance from the tip of the position restricting portion 64 to the center of the rigid cylinder 50 is substantially the same as the inner radius of the horn cover 38. Therefore, when the horn 40 is covered with the horn cover 38 together with the rigid cylindrical body 50, the tip end surface of the position restricting portion 64 contacts the inner peripheral surface of the horn cover 38 as shown in FIG. As a result, the position of the horn cover 38 with respect to the rigid cylinder 50, the horn 40, and the like is restricted, and the horn cover 38 is always positioned concentrically with respect to the horn 40. As a result, the gap between the horn 40 and the horn cover 38 becomes constant, and the cleaning liquid can be supplied more stably.

  Next, a fourth embodiment will be described with reference to FIG. FIG. 7 is a side view of the horn 40 in the vicinity of the vibration node C in the fourth embodiment. In FIG. 7, the vibration absorber 42 is shown in cross section.

  In general, it is known that the amplification factor of the amplitude of longitudinal vibration can be improved by reducing the diameter of the horn 40 at the node C. Therefore, in this embodiment, a taper 65 is formed on the horn 40 on the rear end side from the vibration node C, the outer diameter of the horn 40 at the longitudinal vibration node C is reduced, and the amplitude amplification factor is improved. Yes. Further, by reducing the outer diameter of the horn 40 at the vibration node C, the diameter of the rigid cylindrical body 50 and the horn cover 38 disposed at the position is further reduced.

  Here, when the outer diameter of the horn at the node C is reduced, it is difficult to provide the concave portions 56 and 60 on the outer surface of the horn 40 as in the illustrated example of FIG. Therefore, in the present embodiment, the convex portion 70 is formed on the outer surface of the horn, and the position of the front end side elastic ring body 52a disposed on the rear end side thereof is regulated.

  The distal end side elastic ring body 52a has a cutout 53 for fitting the rigid cylindrical body 50 along the outer periphery, and has a substantially L-shaped cross section. At this time, the end of the rigid horn body 50 on the distal end side of the horn 40 is fitted into the notch 53, thereby fixing the position of the rigid cylinder 50.

  On the rear end side, an elastic ring body 50b having a circular cross section, for example, an O-ring or the like is provided as in the above-described embodiment. The rear end portion of the rigid cylinder 50 is disposed in close contact with the upper surface of the rear end side elastic ring body 52b.

  A procedure for attaching the vibration absorber 42 to the horn 40 will be briefly described. When the vibration absorber 42 is attached to the horn 40, first, the rear end side elastic ring body 52b is passed from the front end of the horn 40, and a position away from the convex portion 70 to the rear end side by a predetermined distance (FIG. 7). To the position immediately before the taper portion 65). At this time, the inner diameter of the rear end side elastic ring body 52b is smaller than the outer diameter of the horn 40, but the rear end side elastic ring body 52b is elastically deformed so as to increase its inner diameter. The end-side elastic ring body 52b can be moved to the aforementioned position. In addition, when passing the convex part 70, a slightly large force is applied to the rear end side elastic ring body 52b, and it elastically deforms significantly. The rear end-side elastic ring body 52b that has reached a position away from the convex portion 70 has its inner shape expanded by elastic deformation, and is in close contact with the outer surface of the horn 40 by the elastic restoring force generated at that time.

  Subsequently, the front-end-side elastic ring body 52a is passed from the front end of the horn 40 and moved to the stepped portion of the convex portion 70 near the rear end of the horn 40. Also in this case, the inner diameter of the tip side elastic ring body 52a is smaller than the outer diameter of the horn 40, but the tip side elastic ring body 52a is elastically deformed so as to increase its inner diameter. The elastic ring body 52a can be moved to the aforementioned position. The tip-side elastic ring body 52a also needs to pass through the convex part 70, but the convex part 70 can be passed by applying a slightly larger force to the tip-side elastic ring body 52a to cause significant elastic deformation. .

  Finally, the rigid cylinder 50 is moved from the tip of the horn 40 to the vicinity of the node, and the end of the tip side is fitted into the notch 53 of the tip elastic ring body 52a. At this time, since the inner diameter of the rigid cylindrical body 50 is formed larger than the convex portion 70 of the horn 40, it can easily pass through the convex portion 70. Further, the outer diameters of the front-end-side elastic ring body 52a and the rear-end-side elastic ring body 52b are larger than the inner diameter of the rigid cylinder body 50. The elastic ring bodies 52a and 52b are appropriately selected according to the inner diameter of the rigid cylinder body 50. It elastically deforms so that its outer diameter becomes smaller. Therefore, the rigid cylinder 50 can be moved to a position where it can be fitted into the notch 53. Then, when the end portion on the distal end side of the rigid cylindrical body 50 is fitted into the cutout portion 53 of the distal elastic ring body 52a, the mounting of the vibration absorber 42 is completed.

  According to this mounting procedure, each member can be easily mounted, but the elastic ring bodies 52a and 52b move together by the frictional force with the passage of the rigid cylindrical body 50, and there is a risk that the elastic ring bodies 52a and 52b may shift from the initial mounting position. is there. Therefore, first, the rigid cylinder 50 may be attached, and then the elastic rings 52a and 52b may be attached. That is, first, the rigid cylinder 50 is moved from the front end of the horn 40 to the vicinity of the node, and then the rear end side elastic ring body 52b is passed through the convex portion 70. Further, the rigid cylinder 50 and the horn 40 are further passed. Is moved to a position away from the convex portion 70 by a predetermined distance, and is brought into close contact with the rigid cylinder 50. Finally, the front end side elastic ring body 52a is moved to the stepped portion of the convex portion 70 near the rear end of the horn 40, and the front end portion of the rigid cylinder 50 is fitted into the cutout portion 53, whereby the vibration absorbing device 42. Installation is complete. According to this mounting procedure, since the elastic ring bodies 52a and 52b are mounted after passing through the rigid cylindrical body 50, displacement of the mounting positions of the elastic ring bodies 52a and 52b accompanying the passage of the rigid cylindrical body 50 can be prevented. .

  As described above, in the present embodiment, the position of the elastic ring body is fixed using the convex portion formed on the outer surface of the horn 40. Thereby, since the diameter of the horn 40 can be further reduced, the amplitude amplification factor of the longitudinal vibration can be improved and the diameter of the entire transmission unit 35 can be further reduced. Further, the cutout portion 53 of the elastic ring body 52 is used to prevent the rigid cylinder from falling off. In other words, the elastic ring body 52 can be prevented from falling off without forming a recess or the like in the horn 40. As a result, the horn 40 can be further reduced in diameter and manufactured easily. Furthermore, also in this embodiment, the vibration absorber 42 functions as a balancer and can reduce or suppress unnecessary vibration.

  Next, a fifth embodiment will be described with reference to FIG. FIG. 8 is a side view of the horn 40 around the node C. In FIG. 8, the vibration absorber 42 is shown in a sectional view. In this embodiment, the number of the elastic ring bodies 52 is one, and this single elastic ring body 52 is disposed in close contact with the position corresponding to the vibration node C. The single elastic ring body 52 has a substantially L-shaped cross section, like the elastic ring body 52 a shown in FIG. 7, and the position is fixed by a convex portion 70 formed on the horn 40.

  In order to reduce the outer diameter of the horn 40 at the vibration node C, a stepped portion 72 is formed on the horn 40 on the rear end side of the vibration node C. The stepped portion 72 is formed at a position where the distance to the arrangement position of the elastic ring body 52 is slightly smaller than the length of the rigid cylinder 50. In other words, the length of the rigid cylinder 50 is slightly longer than the distance from the elastic ring body 52 to the stepped portion 72. When the rigid cylindrical body 50 is disposed between the elastic ring body 52 and the stepped portion 72, the rear end portion of the rigid cylindrical body 50 abuts on the stepped portion 72 and the front end portion is a notch of the elastic ring body 52. It is fitted to the part 53. At this time, the rigid cylinder 50 is pressed in the rear end direction by the elastic force of the elastic ring body 52. By this pressing force, the rigid cylindrical body 50 is fixed in position in a state in which the rear end portion is in contact with the stepped portion 72 and a constant distance is maintained between the rigid cylindrical body 50 and the outer peripheral surface of the horn 40. As a result, the vibration absorber 42 including the rigid cylindrical body 50 and the elastic ring body 52 can function as a balancer, and can reliably reduce or suppress unnecessary vibration. Further, the rigid cylinder 50 and the elastic ring body 52 are prevented from falling off.

  Further, when the elastic ring body 52 is single as in this embodiment, only the longitudinal vibration node C can be surely suppressed, and attenuation of the longitudinal vibration, which is a desired vibration, is minimized. Can do. That is, in the embodiment using two or more elastic rings, it is difficult to suppress only the vibration node C, and the longitudinal vibration, which is a desired vibration, is slightly attenuated. On the other hand, in this embodiment, since only the vibration node C can be pressed, the transmission efficiency of longitudinal vibration can be further improved.

1 is a schematic configuration diagram of an ultrasonic surgical apparatus according to a first embodiment of the present invention. It is a side view of a handpiece. It is a figure which shows the side view of a transmission part, and the amplitude of a longitudinal vibration. It is a side view of the horn in the vicinity of the vibration node C. It is a side view of the horn in the vicinity of the vibration node C in the second embodiment. (A) is a perspective view of the rigid cylinder in the third embodiment, and (B) is a cross-sectional view of the transmission portion in the vicinity of the vibration node C. FIG. It is a side view of the horn in the node part C vicinity of the vibration in 4th embodiment. It is a side view of the horn in the vicinity of the vibration node C in the fifth embodiment.

Explanation of symbols

  10 Ultrasonic Surgical Device, 12 Handpiece, 14 Tank, 16 Washing Pump, 18 Pump Control Circuit, 20 Aspirate Object, 22 Pressure Control Mechanism, 24 Suction Pump, 29 Main Body, 30 Case, 32, 34 Tube, 35 Transmission Part, 38 horn cover, 40 horn, 42 vibration absorber, 50 rigid cylinder, 52 elastic ring, 56, 60 recess, 62 protrusion, 64 position restricting part.

Claims (10)

A vibration transmitting member that transmits a desired vibration generated by a vibration generating source provided on the rear end side to the treatment portion on the distal end side;
A vibration absorbing member provided at a position corresponding to a desired vibration node of the vibration transmitting member, and absorbing unnecessary vibration generated in the vibration transmitting member;
With
The vibration absorbing member
An elastic member made of an elastic material and holding the outer peripheral surface of the vibration transmitting member at a position corresponding to a desired vibration node,
A rigid member made of a rigid material, arranged in a state with a gap between the outer peripheral surface of the vibration transmitting member and abutting on the outer peripheral surface of the elastic member;
An ultrasonic surgical apparatus comprising: The ultrasonic surgical apparatus according to claim 1, further comprising:
An ultrasonic surgical apparatus comprising a cover body that covers the vibration transmission member over substantially the entire length in a state where a gap is provided between the outer peripheral surface of the vibration transmission member and the outer peripheral surface of the rigid member. The ultrasonic surgical apparatus according to claim 2,
An ultrasonic surgical apparatus, wherein a position restricting member for restricting a position of a vibration transmitting member in an internal space of the cover body is provided between the rigid material and the cover body. The ultrasonic surgical apparatus according to claim 3,
An ultrasonic surgical apparatus, wherein a plurality of position restricting members are provided on the outer peripheral surface of the rigid member, and are convex portions that contact the inner peripheral surface of the cover body. The ultrasonic surgical apparatus according to any one of claims 1 to 4,
An ultrasonic surgical apparatus characterized in that a convex portion or a concave portion for fixing the position of the elastic member is formed on the outer peripheral surface of the vibration transmitting member. The ultrasonic surgical apparatus according to any one of claims 1 to 5,
On the outer peripheral surface of the vibration transmitting member, a convex portion or a concave portion that fixes the position of the rigid member is formed on the outer peripheral surface,
An ultrasonic surgical apparatus, wherein a concave portion or a convex portion corresponding to the convex portion or the concave portion that fixes the position of the rigid member is formed on the inner peripheral surface of the rigid member. The ultrasonic surgical apparatus according to any one of claims 1 to 6,
The elastic member includes a first elastic member having a notch,
The position of the rigid member is fixed by fitting an end portion of the rigid member into the cutout portion. The ultrasonic surgical apparatus according to claim 7,
The vibration transmitting member has a stepped portion in the vicinity of the node so that the node has a small diameter,
The ultrasonic surgical apparatus is characterized in that the rigid member is fixed in position by fitting one end of the rigid member into the cutout portion and the other end contacting the stepped portion. The ultrasonic surgical apparatus according to any one of claims 1 to 8,
When the vibration transmission member is bent,
The ultrasonic surgical apparatus characterized in that the bent portion is provided on the rear end side from a desired vibration node. A vibration absorber that absorbs unnecessary vibration generated in the vibration transmission member of the ultrasonic surgical apparatus,
An elastic member made of an elastic material and holding the outer peripheral surface of the vibration transmitting member at a position corresponding to a desired vibration node,
A rigid member made of a rigid material, arranged in a state with a gap between the outer peripheral surface of the vibration transmitting member and abutting on the outer peripheral surface of the elastic member;
A vibration absorber characterized by comprising:

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