JP2007222654A - Ultrasonic treatment instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ultrasonic treatment instrument, not lowering bending rigidity while securing necessary amplitude enlargement rate. <P>SOLUTION: In this ultrasonic treatment instrument, at least in a part of a vibration transmitting member 34 including a tip treatment part 29 coming into contact with biological tissue to make ultrasonic treatment, a cutout part 41 is provided to position in the vertical side to a plane defined by a longitudinal axis of the vibration transmitting member 34 and the direction of load F applied to the treatment part 29. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an ultrasonic treatment tool for performing treatment such as incision and coagulation of a living tissue by ultrasonic vibration in a surgical operation.

2. Description of the Related Art Ultrasonic treatment tools that perform treatments such as incision and coagulation of living tissue by ultrasonic vibration in surgical operations are generally known. As disclosed in Japanese Patent Application Laid-Open No. 2000-254136, a general ultrasonic treatment tool expands the amplitude of ultrasonic vibration generated by an ultrasonic transducer to an amplitude necessary for treatment, and thus a probe that transmits ultrasonic vibration. A horn is provided on the way.
JP 2000-254136 A

  In the conventional ultrasonic treatment instrument, a horn is provided in the middle of the probe. Conventional horns, such as a conical type and an exponential type, all have a circular cross-section with a reduced area.

  In recent years, it has been desired to reduce the diameter of the treatment tool. Therefore, as the diameter of the treatment tool is reduced, the probe becomes thinner, and if the diameter of the probe is further reduced to increase the amplitude, the bending rigidity of the probe decreases. Resulting in. For this reason, it has been found that during treatment with the ultrasonic treatment tool, the probe bends greatly when a load is applied to the probe tip, causing problems such as interference with other parts.

  In addition, when trying to reduce the size of the treatment tool for minimally invasiveness, if the probe shape is determined in the space determined by the combination with other parts and the amplitude is increased, the amplitude required for the procedure is obtained. There was a situation where it was impossible.

  The present invention has been made paying attention to the above problems, and an object of the present invention is to provide an ultrasonic treatment instrument that ensures a necessary amplitude magnification and does not reduce the bending rigidity of the probe.

According to a first aspect of the present invention, there is provided a vibrator for generating ultrasonic vibration, a vibration transmission member for transmitting ultrasonic vibration generated by the vibrator, and provided at a tip of the vibration transmission member and in contact with a living tissue. Provided at a position that is positioned in a direction perpendicular to a plane defined by a distal treatment section that performs ultrasonic treatment and a longitudinal axis direction of the vibration transmission member of the vibration transmission member and a load direction applied to the distal treatment section. And a notch portion formed by notching along the longitudinal axis direction of the vibration transmitting member, wherein the length of the notch portion in the longitudinal axis direction is longer than the width in the load direction. This is an ultrasonic treatment tool.
According to a second aspect of the present invention, there is provided a vibrator for generating ultrasonic vibration, a vibration transmission member for transmitting ultrasonic vibration generated by the vibrator, and provided at a tip of the vibration transmission member and in contact with a living tissue. Provided at a position that is positioned in a direction perpendicular to a plane defined by a distal treatment section that performs ultrasonic treatment and a longitudinal axis direction of the vibration transmission member of the vibration transmission member and a load direction applied to the distal treatment section. A flat portion whose width in the direction perpendicular to the plane is narrower than the width in the load direction, and is formed by cutting along the longitudinal axis direction of the vibration transmitting member. The ultrasonic treatment instrument is characterized in that a length of the cutout portion in the longitudinal axis direction is longer than a width in the load direction.
According to a third aspect of the present invention, in the ultrasonic wave according to the first or second aspect, the base end where the cutout portion starts is substantially located at a vibration node of the vibration transmitting member. It is a treatment tool.
The invention according to claim 4 is the ultrasonic treatment instrument according to claim 3, wherein the vibration node is a vibration node on the most proximal side of the vibration transmitting member.
The invention according to claim 5 is characterized in that the notch is provided at two locations on the side wall of the vibration transmission member that is located in a direction perpendicular to the load direction. An ultrasonic treatment instrument according to claim 3 or claim 4.

  According to the present invention, the vibration amplitude can be increased without reducing the bending rigidity of the probe. That is, it is possible to suppress a decrease in the bending rigidity of the probe while expanding the ultrasonic vibration generated by the vibrator to an amplitude necessary for the treatment. For this reason, the diameter of the probe can be reduced. In addition, since the probe can be reduced in diameter, the probe can prevent interference with other parts.

  Hereinafter, an ultrasonic treatment device according to an embodiment of the present invention will be described with reference to the drawings.

(Constitution)
As shown in FIG. 1A, an ultrasonic treatment instrument 1 includes a handpiece 2 in which an ultrasonic transducer (not shown) that generates ultrasonic vibrations is installed, a treatment probe 3, and this A sheath 4 covering the probe 3. A feeding cord 5 is connected to the rear end of the handpiece 2 so as to extend in a coaxial direction.

  As shown in FIG. 1B, a holding member unit 13 assembled with a C ring 12 as a latch receiving portion is fastened and fixed to the tip of the casing 11 of the handpiece 2. The holding member unit 13 is screwed into the tip of the casing 11 and is fixedly connected to the casing 11.

  The sheath 4 includes a pipe-shaped insertion portion 15 that covers the probe 3 and a main body portion 16 that also serves as a base portion thereof, and the insertion portion 15 and the main body portion 16 are connected via a connecting member 17. The main body portion 16 and the connecting member 17 are screwed together by a female screw portion 18 and a male screw portion 19 provided in each fitting portion. The main body 16 and the connecting member 17 may be connected by adhesion.

  The insertion portion 15 in the sheath 4 has a double pipe structure, a hard pipe member 21 made of a metal such as stainless steel is arranged on the outside, and a resin tube member 22 made of fluororesin is arranged on the inside. An equal-diameter straight tubular sheath is formed. The resin tube member 22 forms a pipe line having a diameter capable of being inserted through the protrusion 23 which is the maximum diameter portion of the probe 3.

  As shown in FIG. 1B, the resin tube member 22 extends to the proximal end side of the connecting member 17, and when the handpiece 2, the probe 3 and the sheath 4 are connected and assembled, the most proximal end side of the probe 3. It is arranged so as to surround at least a part of the region of the protrusion 24 provided at the position. Further, the base end side portion of the resin tube member 22 is formed as an enlarged portion 25 that is formed in a tapered shape so as to be larger than the inner diameter of the hard pipe member 21. The enlarged portion 25 is positioned by being joined to a tapered opening surface 17 a formed on the proximal end wall portion of the connecting member 17.

  The insertion portion 15 is coaxially disposed outside the probe 3 except for the treatment portion 29 formed at the tip of the probe 3, and is fixedly connected to the connecting member 17 by adhesion. Further, as shown in FIG. 1B, the insertion portion 15 is extended by a length that covers the vicinity of the proximal end portion of the treatment portion 29 described later.

  As shown in FIG. 1B, a mounting portion 26 that is detachably mounted on the holding member unit 13 of the handpiece 2 is configured at the proximal end portion of the body portion 16 of the sheath 4. The mounting portion 26 has an inner cylinder 27 attached to the base end portion of the main body portion 16 so that the inner cylinder 27 portion enters the inside of the holding member unit 13 on the handpiece 2 side. The inner cylinder 27 is tightly fitted to the inner peripheral surface of the holding member unit 13 and constitutes guide means for determining the mounting position of the sheath 4 with respect to the handpiece 2. Further, a fitting space into which the holding member unit 13 is fitted is formed between the base end edge portion of the main body portion 16 of the sheath 4 and the inner cylinder 27, and the holding member for the handpiece 2 is formed in the fitting space. An engaging member 28 is disposed to engage the C ring 12 of the unit 13 and position and fix the sheath 4 to the handpiece 2.

  As shown in FIG. 1B, the probe 3 is connected to an ultrasonic transducer provided inside the handpiece 2. That is, the female screw 31 is formed at the output end 30 portion of the ultrasonic transducer installed in the handpiece 2, and the male screw 32 detachable from the female screw 31 is formed at the proximal end portion of the probe 3. Is formed. The probe 3 is connected to the ultrasonic transducer in the handpiece 2 by screwing the female screw 31 and the male screw 32 together.

  Further, a short range portion at the proximal end of the vibration transmission member 34 of the probe 3 has a diameter larger than that of the distal end side portion of the probe 3, and a horn is interposed between the large diameter portion 35 and the distal end side portion 36. 37 is provided. The horn 37 is disposed in the internal space region of the main body portion 16 of the sheath 4 while avoiding the connecting member 17. The horn 37 has a conical shape, an exponential shape, a Fourier shape, a step shape or the like, and the horn 37 has a circular cross-sectional shape.

  A distal end portion of the probe 3 that protrudes from the distal end of the sheath 4 and is exposed forms a treatment portion 29. That is, the treatment portion 29 is connected to the tip of the vibration transmission member 34.

  In addition, the treatment portion 29 of the probe 3 has a shape that facilitates treatment according to the surgical procedure, as shown in the respective drawings of FIG. For example, a pole type as shown in FIG. 2 (A), a spatula type as shown in FIG. 2 (B), a female type as shown in FIG. 2 (C), as shown in FIG. 2 (D). Various shapes can be selected, such as a round shape, a hook shape as shown in FIG. 2E, and a knife shape as shown in FIG. In particular, an ultrasonic radiation surface 39 is provided in the treatment portion 29 of the type shown in FIGS.

  The length of the probe 3 is a specific length that generates a standing wave at the drive frequency. In the vibration transmission member 34 of the probe 3, projections 23 and 24 that swell in the radial direction of the vibration transmission member 34 are provided at vibration nodes. The protrusion 23 may be made of a silicone rubber lining.

  Further, a pair of notches 41 are provided in the middle of the vibration transmission member 34 of the probe 3. The cross-sectional shape of the notch 41 along the line AA shown in FIG. 1B is as shown in FIG. 3, and depends on the load F applied to the treatment portion 29 and the longitudinal axis L of the probe 3. It is formed so as to have a flat shape with a narrow width in the direction perpendicular to the prescribed plane. That is, the notches 41 are notched at two symmetrical positions located in a direction perpendicular to the plane defined by the longitudinal axis L of the vibration transmitting member 34 and the direction of the load F applied to the treatment portion 29.

The notch 41 is provided between the most proximal vibration node and the most distal vibration node of the vibration transmitting member 34. In the present embodiment, the most distal vibration node is in the protrusion 23, and the most proximal vibration node is in the protrusion 24.
In addition, the cross-sectional shape of both front and rear end portions of the notch portion 41 is an arc shape, so that a rapid change in the cross-sectional area of the vibration transmitting member 34 is alleviated, and the transmission efficiency of ultrasonic vibration is increased.

  In addition, the outer periphery of the main body portion 16 is provided with a grip portion 43 that is grooved so as not to slip when held by an operator.

(Function)
In the ultrasonic treatment instrument according to this embodiment, in the state where the handpiece 2, the probe 3, and the sheath 4 are assembled, the probe 3 is arranged so that portions other than the vibration node do not interfere with the insertion portion 15 by the protrusions 23 and 24. Positioned. Further, the protrusions 23 and 24 which are vibration nodes of the probe 3 hit the sheath 4 disposed on the outer periphery thereof, thereby restricting the movement of the probe 3 in the radial direction. The resin tube member 22 is fixed so as not to move in the distal direction of the hard pipe member 21 by an enlarged portion 25 formed at the base end.

  The ultrasonic vibration generated by the vibrator in the handpiece 2 is transmitted to the treatment portion 29 through the large-diameter portion 35, the horn 37, and the vibration transmission member 34 of the probe 3, and used for treatment. At this time, the amplitude of the ultrasonic vibration is expanded by the horn 37 and the cutout portion 41 in which the cross-sectional area of the probe 3 is changed.

(effect)
In the probe 3 having a length of one wavelength of the driving frequency, only the projections 23 and 24 of the two vibration nodes are in contact with the inner surface of the sheath 4, and the radial movement is fixed, thereby the load F applied to the treatment portion 29. The probe 3 is prevented from bending and causing interference with the unintended sheath 4. The enlarged portion 25 prevents the resin tube member 22 from falling off from the distal end side of the sheath 4.

  Further, the notch portion 41 is cut in a direction perpendicular to the direction of the load F applied to the treatment portion 29 to reduce the cross-sectional area of the probe 3, while expanding to a necessary vibration amplitude that cannot be obtained by the horn 37 alone, and A decrease in bending rigidity in the direction of the load F can be suppressed. That is, even if the cross-sectional area of the probe 3 is reduced to increase the amplitude, it is possible to suppress a decrease in bending rigidity in the load direction.

  In addition, this invention is not limited to embodiment mentioned above, It can apply also to another form.

(A) is an external appearance side view of the ultrasonic treatment tool which concerns on one Embodiment of this invention, (B) is a partial longitudinal cross-sectional view of the ultrasonic treatment tool. (A), (B), (C), (D), (E), and (F) respectively show various examples of the treatment section of the ultrasonic treatment tool, and the right side in the sectional views of (C), (D), and (F) is treatment. It is a side view of a part, and the left side is a longitudinal cross-sectional view of a treatment part. It is a longitudinal cross-sectional view of the notch part formed in the middle of the vibration transmission member in the probe of the said ultrasonic treatment tool.

Explanation of symbols

F ... Load 1 ... Ultrasonic treatment tool 2 ... Hand piece 3 ... Probe 4 ... Sheath 11 ... Case 15 ... Insertion part 16 ... Body part 21 ... Hard pipe member 22 ... Resin tube member 29 ... Treatment part 34 ... Vibration transmission member 37 ... Horn 39 ... Radiation surface 41 ... Notch

Claims (5)

A vibrator that generates ultrasonic vibrations;
A vibration transmitting member for transmitting ultrasonic vibration generated by the vibrator;
A tip treatment unit provided at the tip of the vibration transmitting member and performing ultrasonic treatment in contact with the living tissue;
The vibration transmitting member is provided at a position located in a direction perpendicular to a plane defined by the longitudinal axis direction of the vibration transmitting member and the load direction applied to the distal treatment section, and in the longitudinal axis direction of the vibration transmitting member. A notch formed by cutting along, and
And the length of the cutout portion in the longitudinal axis direction is longer than the width in the load direction. A vibrator that generates ultrasonic vibrations;
A vibration transmitting member for transmitting ultrasonic vibration generated by the vibrator;
A tip treatment unit provided at the tip of the vibration transmitting member and performing ultrasonic treatment in contact with the living tissue;
The width of the vibration transmission member provided in a position perpendicular to the plane defined by the longitudinal axis direction of the vibration transmission member and the load direction applied to the distal treatment portion and in the direction perpendicular to the plane Is a flat thing narrower than the width in the load direction, and is formed by cutting out along the longitudinal axis direction of the vibration transmitting member;
And the length of the cutout portion in the longitudinal axis direction is longer than the width in the load direction.   The ultrasonic treatment instrument according to claim 1 or 2, wherein the notch has a base end where the notch is started substantially positioned at a vibration node of the vibration transmitting member.   The ultrasonic treatment instrument according to claim 3, wherein the vibration node is a vibration node on the most proximal side of the vibration transmission member.   The said notch is provided in two places of the side wall located in the direction perpendicular | vertical to the said load direction in the said vibration transmission member, The claim 1, Claim 3, Claim 4 characterized by the above-mentioned. The ultrasonic treatment device described.

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