JP2000300575A - Hand piece and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply fix an internal unit within a case in a hand piece used for an ultrasonic operation devices. SOLUTION: An operation unit 18 is inserted into a case through a rear end opening of a case body 12. First engaging part formed on the tip side of an operation unit 18 is get to engage a second engaging part formed on the internal surface of a horn cover 14 through an O-ring 38 to regulate forward movement of the operation unit 18. Under such a condition, a rear end cap 20 is inserted into the rear end opening and is expanded sandwiching an elastic member 48 to be fixed. Thereby, the backward movement of the operation unit 18 is regulated and a leader part 54A is simultaneously sealed when the rear end cap 20 is mounted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a handpiece, and more particularly to a handpiece for a medical device such as an ultrasonic surgical instrument.

[0002]

2. Description of the Related Art A handpiece for an ultrasonic surgical instrument is roughly composed of a case and a unit housed therein. Conventionally, when a unit is stored in a case, for example, about 10 processes are required. These steps include, for example, a step of fixing a cylindrical fixing member in a case and press-fitting the body of the vibration unit into the fixing member, and a step of driving a plurality of pins into the vibration unit via the fixing member and the case. There are many steps including a step of injecting silicone between the case and the vibrating unit to reinforce the seal by the O-ring and solidifying it, and a step of sealing the outlet of the signal cable. Therefore, there is a problem that the manufacturing operation is complicated and the manufacturing cost cannot be reduced. There is also a problem that the structure of the handpiece becomes complicated. Further, when performing maintenance, there is a problem that it is extremely difficult to pull out the vibration unit from inside the case. Furthermore, due to the necessity of a large number of steps, there are many precautions for properly assembling the handpiece, and there is a problem that the labor load on the operator is large. This problem is also pointed out in medical devices such as electrosurgical handpieces.

[0003] The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a handpiece that can easily set an internal unit to a case.

Another object of the present invention is to provide a handpiece that allows the internal unit to be easily removed from the case.

Another object of the present invention is to make it possible to collectively perform processes such as fixing an internal unit, connecting a flow path, and sealing around a signal cable.

[0006]

(1) In order to achieve the above object, according to the present invention, a first engaging portion is formed on a distal end side,
A surgical unit for supplying a surgical signal to the surgical tool,
A case in which a second engagement portion is formed at a position corresponding to the first engagement portion, and a surgical unit is inserted from a rear end opening;
In a state where the first engagement portion is engaged with the second engagement portion and the advancement of the surgical unit with respect to the case is regulated, the surgical unit with respect to the case is mounted on the rear end opening of the case. And a rear end cap for restricting retraction.

According to the above configuration, when the surgical unit is inserted into the case from the rear end opening of the case, the first engaging portion formed on the distal end side of the surgical unit has the second engaging portion formed inside the case. And thereby restrict the forward movement of the surgical unit with respect to the case. In addition, a rear end cap is attached to the rear end opening, thereby restricting the retreat of the operation unit with respect to the case. Therefore, the forward and backward movement of the operating unit with respect to the case is suppressed by the engaging operation of the first and second engaging portions and the plug operation of the rear end cap, that is, the operating unit is fixed. According to the present invention, the handpiece can be assembled in two basic steps of inserting the surgical unit and attaching the rear end cap, so that the manufacturing process can be greatly simplified.

The first engaging portion is preferably provided at or near the distal end of the surgical instrument, but is provided at least in front of the center of the surgical unit. In this case, the first engagement portion is basically formed on the outer peripheral surface of the surgical unit, and is preferably provided at a position of a vibration node. The second engaging portion is a position on the inner wall of the case corresponding to the first engaging portion (an engageable position).
Is formed. The engagement portions can be configured as, for example, shoulders and steps. The rear end cap can be provided so as to cover the rear end opening, but may be inserted like a stopper inside the rear end opening. In that case, it is desirable that the rear end cap holds and seals the signal line. By removing the rear end cap, the surgical unit can be easily pulled out of the case, and the maintenance performance is good.

Preferably, a first elastic member is interposed between the first engaging portion and the second engaging portion. Preferably, a second elastic member is interposed between an intermediate body of the operation unit and an inner wall of the case. Preferably, a third engagement portion is formed at a rear end of the operation unit, and a fourth engagement portion that engages with the second engagement portion via a third elastic member at a front end of the rear end cap. Is formed. The surgical unit can be stably held by various elastic members, and a sealing action by the elastic members can be exhibited.

Preferably, a unit flow path is formed along a central axis of the operation unit, and a cap flow path communicating with the unit flow path is formed along a central axis of the rear end cap. Preferably, a pin is provided for restricting rotation of the surgical unit in the case. For example,
When a replaceable tip is attached to the tip of a surgical tool (for example, an ultrasonic horn) exposed from the tip opening of the case (for example, the horn cover tip opening), if a pin is provided, rotation at the time of tip attachment It is possible to prevent the operation unit from rotating with respect to the case due to the force.

Preferably, the handpiece includes an ultrasonic vibrator. That is, the present invention is applicable to various handpieces such as an ultrasonic surgical handpiece and an electrosurgical handpiece, but is preferably applied to the former handpiece, which has a complicated structure of a surgical unit. .

(2) To achieve the above object,
The present invention provides a surgical unit for supplying a surgical signal to a surgical tool, a case in which the surgical unit is inserted from a rear end opening, and a state in which the surgical unit is inserted in the case, the rear side. A rear end cap attached to the opening to regulate the movement of the surgical unit, wherein the rear end cap has an elastic member having an outer diameter corresponding to the inner diameter of the case, and the elastic member And a clamping mechanism for clamping and inflating in the radial direction.

According to the above construction, the elastic member constituting the rear end cap is elastically deformed in the radial direction and swells, and the rear end cap can be securely fixed by frictional resistance under the pressing force. In particular, the rear end cap can be mounted without providing a special structure inside the rear end opening, and the mounting is completed by a simple operation. Since elastic deformation is used, a sealing effect can also be expected.

Preferably, the holding mechanism includes a pair of blocks sandwiching the elastic member, and a screw member provided across the pair of blocks to reduce a distance between the pair of blocks. According to this configuration, the operation unit can be fixed by tightening the screw, and the fixed state can be released by loosening the screw.

Preferably, a cable hole through which the signal cable passes is formed in the elastic member, and the space between the cable hole and the signal cable is sealed as the elastic member is sandwiched. Conventionally, a special seal has been required for a portion where the signal cable is taken out (e.g., filled with silicone). Can be sealed.

(3) To achieve the above object,
The present invention provides a surgical unit for supplying a surgical signal to a surgical tool, a case for housing the surgical unit, and a case in which the surgical unit is housed in the case and radially expanded in the case. Means for fixing the operation unit to the case.

(4) In order to achieve the above object,
The present invention is a step of inserting a surgical unit from a rear end opening in a case, and a step of inserting an elastic member into the rear end opening in a state where the surgical unit is inserted in the case,
Pressurizing and holding the elastic member so as to expand in the radial direction of the elastic member, thereby fixing the surgical unit.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a preferred embodiment of a handpiece according to the present invention, and FIG. 1 is a sectional view thereof. The handpiece 10 shown in FIG. 1 is a handpiece for an ultrasonic surgical instrument in the present embodiment.

The handpiece 10 is roughly divided into a case main body 12 and a horn cover 14 attached to the tip thereof.
And an internal assembly 16 housed in a handpiece case constituted by the case main body 12 and the horn cover 14. The internal assembly 16 is roughly composed of a surgical unit 18 and a rear end cap 20. Hereinafter, each configuration will be specifically described.

In the operating unit 18, the vibrator section 22
Is a so-called bolt-clamp type ultrasonic transducer, and has a plurality of piezoelectric elements 30. Electrodes are provided between the respective piezoelectric elements 30, and a laminated body including a plurality of piezoelectric bodies and electrodes is sandwiched between a pair of blocks 32 and 34 at a predetermined pressure. That is, the horn 2
A front block 34 extending to 4 is provided, and a rear block 32 is provided on the rear side of the laminate. These two blocks 32 and 34 are connected to each other by bolts (not shown). This structure itself is a known structure.

A ring groove 34A is formed on the laminate side of the front block 34 (an intermediate portion of the operation unit 18).
An O-ring 36 is provided in the ring groove 34A. The O-ring 36 is provided at the position of the node of the vibration, and has a function of fixing and sealing the operation unit 18.

The front end of the front block 34 has an O-ring 38
And is engaged with the horn cover 14 through the opening. This will be described later in detail with reference to FIG. Here, the O-ring 38
Has a function of fixing and sealing the operation unit 18 similarly to the O-ring 36.

The horn 24 is connected to the front end of the front block 34, and the ultrasonic vibration generated in the vibrator section 22 is transmitted to the horn 24 via the front block 34. Then, the tissue is crushed by the tip of the horn. In the present embodiment, the tip 25 is mounted on the tip of the horn 24. For example, when the tip 25 is deteriorated, only the relevant portion can be replaced. A hollow channel 24A is formed inside the horn 24, and the crushed tissue and the washing solution can be sucked through the channel 24A.

The tip of the pipe 13 is connected to the horn cover 14. The pipe 13 is for supplying a cleaning liquid, and the cleaning liquid is supplied to a gap between the horn cover 14 and the horn 24. Then, the cleaning liquid is supplied to the affected part through the gap. Here, as described above, O
Since the ring 38 is provided, the cleaning liquid does not enter the case body 12.

Next, the rear end cap 20 will be described in detail. The rear end cap 20 is a member inserted like a stopper into the rear end opening of the case body 12 in the present embodiment,
The rear end cap 20 includes a first connection block 46, an elastic member 48, and a second connection block 50. First
The second connecting blocks 46 and 50 are made of, for example, a metal such as aluminum, and the elastic member 48 is made of, for example, rubber. First connecting block 46 and second connecting block 50
A tightening screw 52 is provided over the two connecting blocks 4 by tightening the tightening screw 52.
6, 50 are close to each other, so that the elastic member 48 expands in the radial direction. Due to the sliding resistance between the elastic member 48 and the inner wall of the case body 12 due to the expansion pressure, the rear end cap 20 is securely and stably fixed in the rear end opening.

In the handpiece 10 of the present embodiment, the operation unit 18 is inserted from the rear end opening of the case main body 12, and when the operation unit 18 reaches the forward end thereof, the operation unit 18 is inserted into the rear end opening of the case main body 12. The rear end cap 20 is inserted, and the rear end cap 20 is fixed in a state where pressure is applied slightly in the forward direction. That is, the elastic member 48 is fixed by expansion. In this state, the forward movement of the operating unit 18 is regulated by the engaging action of the first engaging portion and the second engaging portion as described later with reference to FIG. The directional movement is regulated by the presence of the rear end cap 20. In other words, by operating the inward regulation on both the front end side and the rear end side of the surgical unit,
The operation unit 18 can be securely fixed inside the case main body 12.

Incidentally, as described above, the O-ring 36 is provided at the position of the node of the vibration.
8 is also provided at the position of the node of vibration. Such a positional relationship and the operation unit 18 are made of an O-ring 36 such as rubber,
The ultrasonic waves generated by the vibrator portion 22 can be efficiently transmitted to the horn 24 because the ultrasonic waves are held by the horn.

The rear end cap 20 will be further described. The first and second connection blocks 46 and 50 and the elastic member 48 have a disk shape corresponding to the circular shape of the rear end opening. The distal end side of the first connection block 46 protrudes, and a holder 56 is formed. The holder 56
Engages with a nozzle 40 protruding from the rear end side of the vibrator part 22. Specifically, a sleeve 42 is provided around the outer periphery of the nozzle 40, and the sleeve 42 is
At the supporting wall 56A. The holder 5
An O-ring 44 is provided inside the nozzle 6 so as to surround the nozzle 40, thereby sealing between the members. The inside of the nozzle 40 communicates with the above-described internal flow path 24 </ b> A of the horn 24, and further, the inside of the nozzle 40 communicates with a flow path formed in the center of each member of the rear end cap 20, and finally the nozzle 58. Communicates with the interior of the A tube (not shown) is connected to the nozzle 58, and the suctioned cleaning liquid is transported through such a tube.

Further, as shown in FIG. 3, the rear end cap 20 is formed with a cable hole through which the lead-out portion 54A of the cable 54 penetrates. The portion 54A is strongly tightened, and the portion is sealed. Therefore, the drawer 54A
It is no longer necessary to apply a special sealing process to the fixed portion of the device.

Incidentally, the outer diameter of the intermediate portion of the handpiece 10 is, for example, 12 mm, and can be formed as thin as several mm by reducing the number of parts as compared with a conventional handpiece having the same function. Further, in the embodiment shown in FIG. 1, a bolt-type ultrasonic transducer is used, but a so-called magnetostrictive transducer can be used.

Although not shown in FIG. 1, for example, one or a plurality of bearings may be provided around the first connecting block 46. According to such a configuration, the operation of inserting the rear end cap 20 can be performed more smoothly. Although only one fastening screw 52 is shown in FIG. 1, for example, two or three such fastening screws 52 may be provided. If the plurality of tightening screws 52 are arranged uniformly, there is an advantage that imbalance in tightening the elastic member 48 can be prevented.

FIG. 2 shows the operation unit 18 shown in FIG.
2 is an enlarged view of the tip portion. Previous block 3
A shoulder 60 is formed at the tip end of the horn cover 4, while the horn cover 1 correspondingly forms part of the case of the handpiece.
4 has a step 64. Here, shoulder 60
Functions as a first engaging portion, and the step portion 64 functions as a second engaging portion. The O-ring 38 is disposed between them as described above. Here, the front contact surface 60 </ b> A of the shoulder portion 60 is connected to the step portion 6.
4, facing the rear facing contact surface 64A,
An O-ring 38 exists between the two surfaces. The gap between the outer peripheral surface 60B of the distal end member 62 in the front block 34 and the inner peripheral surface 64B at the rear end of the horn cover 14 is set smaller than the diameter of the O-ring 38 in the present embodiment. O-ring 3 between two surfaces
As a result, the O-ring 38 is flattened with the axial direction of the handpiece as a long axis. This makes it possible to enhance the sealing effect. Of course, when inserting the operation unit 18 into the case main body 12, the forward movement of the operation unit 18 is restricted by the presence of the O-ring 38. That is, the shoulder portion 60 and the step portion 64 collide via the O-ring 38, and this determines the advance end of the operation unit 18.

A U-shaped groove 68 is formed in the tip member 62 and engages with a pin 70 provided on the horn cover 14.
By the engagement between the pin 70 and the U groove 68, the rotational movement of the operation unit 18 is restricted. For example, as shown in FIG. 1, when attaching the tip 25 to the horn 24, an operation of rotating the tip 25 using a special tool is performed. In this case, the rotation of the surgical unit 18 is stopped. Can be performed.

Incidentally, in the present embodiment, the case body 12 and the horn cover 14 are formed separately, but they may of course be integrated as a handpiece case.

FIG. 3 is an enlarged view of the rear end cap 20. As described above, the elastic member 48 is sandwiched between the first connection block 46 and the second connection block 50,
The elastic member 48 expands in the radial direction by tightening the tightening screw 52. As a result, it becomes possible to securely fix the rear end cap 20 inside the rear end opening of the case body 12,
At the same time, it is possible to reliably seal the drawer 54A of the cable 54. Here, the drawer 54A is provided with cable holes 46B, 4 formed in the respective members 46, 48, 50.
8B and 50B.

A screw hole 46 A is formed in the first connection block 46, and the screw hole 46 A is screwed with a tip screw portion 52 B of the tightening screw 52. The elastic member 48 has a screw hole 4
8A is formed, and a screw hole 50 is formed in the second connection block 50.
A is formed. In addition, a step is formed in the second connecting block 50 so that the screw head 52A is brought into contact with the screw head 52A.
The first connecting block 46 is formed with a tubular portion 46C that penetrates the central portion of the elastic member 48. are doing.

Next, a method of assembling the handpiece 10 shown in FIG. 1 will be described with reference to FIG.

First, the horn cover 14 is attached to the case body 12.
Is attached, the surgical unit 18 is inserted into the rear end opening 12A of the case body 12. This is indicated by the symbol S1. When the insertion is performed, the shoulder portion 60 comes into contact with the step portion 64 via the O-ring 38 as shown in FIG. As a result, the forward movement of the surgical unit 18 is restricted. In a state where a slight pressure is applied to the operation unit 18 in the forward direction, the symbol S
As shown by 2, the rear end cap 20 is inserted into the rear end opening 12 </ b> A, and the surgical unit 1 is
The above-mentioned tightening screw 52 is tightened while maintaining a state in which a slight pressure is applied to the front side of the screw 8. Then, the rear end cap 20 is securely fixed to the rear end opening 12A.

Incidentally, it is desirable that the O-rings 38, 36, and 44 be attached to the operation unit 18 in advance. Here, regarding the O-ring 40, the rear end cap 2
0 holder 56 can also be inserted. In addition, when the rear end cap 20 is mounted, it is necessary to insert the lead portion 54A of the cable 54 through the rear end cap 20 in advance. With such processing, the sealing of the drawer portion 54A can be achieved at the same time when the rear end cap 20 is attached.

According to the handpiece according to the present embodiment,
Since the operation unit 18 can be fixed in the axial direction at basically two places on the distal end side and the rear end side of the operation unit 18, for example, the number of steps can be reduced to about 30% of the conventional number. In addition, since it is not necessary to inject silicone or the like into the case and wait for the solidification thereof, for example, the manufacturing time of one handpiece is reduced by 5 times as compared with the conventional case.
It becomes possible to make it 1/0.

[0042]

As described above, according to the present invention,
The internal unit can be easily set in the case. Further, the manufacturing process can be simplified.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a preferred embodiment of a handpiece according to the present invention.

FIG. 2 is an enlarged view of a distal end portion of a surgical operation unit.

FIG. 3 is an enlarged view of a rear end cap.

FIG. 4 is a view for explaining an assembling method at the time of assembling;

[Explanation of symbols]

10 handpiece, 12 case body, 14 horn cover, 16 internal assembly, 18 surgical unit,
20 rear end cap, 22 vibrator part, 24 horn, 4
6 1st connection block, 48 elastic members, 50 2nd connection block, 52 fastening screw, 60 shoulder part (1st engagement part), 64 step part (2nd engagement part).

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) A61C 1/10 A61B 17/39 A61F 9/007 A61F 9/00 520 (72) Inventor Gen Ogura Mitaka, Tokyo 6-22-1, Ichimure, Aloka Co., Ltd. (72) Inventor Takashi Ota 6-22-1, Mure, Mitaka City, Tokyo Aloka Co., Ltd. (72) Inventor Shigeo Kimura, 6-22 Mure, Mitaka City, Tokyo No. 1 Aloka Co., Ltd. (72) Inventor Eiichi Minagawa 6-22-1, Mure, Mitaka-shi, Tokyo Aloka Co., Ltd. F-term (reference) 4C052 AA07 BB07 CC03 CC27 EE03 EE04 MM03 4C060 EE03 JJ11 KK01 KK41 KK47

Claims (12)

[Claims] A first engaging portion is formed on the distal end side, a surgical unit for supplying a surgical signal to a surgical instrument, and a second engaging portion is formed at a position corresponding to the first engaging portion. A case in which a surgical unit is inserted from a rear end opening; and a state in which the first engaging portion is engaged with the second engaging portion to restrict advance of the surgical unit with respect to the case. And a rear end cap attached to a rear end opening of the case to restrict retreat of the operation unit with respect to the case. 2. The handpiece according to claim 1, wherein a first elastic member is interposed between the first engagement portion and the second engagement portion. 3. The handpiece according to claim 1, wherein a second elastic member is interposed between an intermediate body of the operation unit and an inner wall of the case. 4. The handpiece according to claim 1, wherein a third engaging portion is formed at a rear end of the operation unit, and a third elastic member is formed at a front end of the rear end cap via a third elastic member. A handpiece, wherein a fourth engaging portion for engaging with the joining portion is formed. 5. The handpiece according to claim 1, wherein a unit flow path is formed along a central axis of the surgical unit, and a cap flow communicating with the unit flow path along a central axis of the rear end cap. A handpiece having a road formed therein. 6. The handpiece according to claim 1, further comprising a pin for restricting rotation of the operation unit in the case. 7. The handpiece for ultrasonic surgery according to claim 1, wherein the handpiece includes an ultrasonic vibrator. 8. A surgical unit for supplying a surgical signal to a surgical tool, a case in which the surgical unit is inserted from a rear end opening, and a state in which the surgical unit is inserted in the case.
A rear end cap attached to the rear opening to fix the operation unit, wherein the rear end cap has an outer diameter corresponding to the inner diameter of the case; A handpiece comprising: a holding mechanism for holding a member to expand in a radial direction. 9. The handpiece according to claim 8, wherein the holding mechanism includes a pair of blocks sandwiching the elastic member, and a screw provided across the pair of blocks to reduce a distance between the pair of blocks. A handpiece, comprising: a member; 10. The handpiece according to claim 8, wherein the elastic member has a cable hole through which a signal cable passes, and a gap between the cable hole and the signal cable is sealed as the elastic member is sandwiched. A handpiece characterized by being performed. 11. A surgical unit for supplying a surgical signal to a surgical tool, a case for housing the surgical unit, and a state in which the surgical unit is housed in the case.
Means bulging radially within said case, thereby securing said surgical unit to said case. 12. A step of inserting a surgical unit into the case through a rear end opening, a step of inserting an elastic member into the rear end opening with the surgical unit inserted into the case, and adding the elastic member. A step of clamping and expanding the elastic member in the radial direction, thereby fixing the surgical unit.