JP3055768U - Ultrasound surgery device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] In an operation of attaching a tip to a handpiece in an ultrasonic surgical apparatus, a screw often does not bite and is redone. For this reason, it has been a problem to reduce the number of redoes and quickly mount chips. SOLUTION: The number of times of reattaching the chip is reduced by providing three protrusions of the screw tightening wrench and three recesses of the chip that mesh with the protrusion.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a tip of an ultrasonic surgical apparatus generally used for cataract surgery.

[0002]

[Prior art]

 In cataract surgery, a method of removing a clouded lens nucleus (hereinafter, lens nucleus) is used, and an ultrasonic surgical device is used as one of the removal methods. The ultrasonic surgical apparatus is composed of a handpiece 1 shown in FIG. 2 and a tip 2 having a structure detachable from the tip of the handpiece 1 with a screw. Ultrasonic waves are oscillated from inside the handpiece 1 and transmitted to the tip 2. In the surgery, the tip of the chip 2 is brought into contact with the lens nucleus, whereby the lens nucleus is crushed by the vibrational energy of the ultrasonic wave to remove unnecessary lens nuclei.

The shape of the handpiece 1 is roughly a pencil shape, a length of 150 mm to 200 mm, an outer diameter of about 15 mm, and the material is made of titanium or stainless steel. A screw 11 is formed at the tip, and the screw 21 of the chip 2 is attached to the screw 11 by turning it clockwise in the direction of the arrow shown in FIG.

The tip 2 is screwed firmly into the handpiece 1 using a dedicated wrench 3 (FIG. 4) for tightening to reduce the transmission loss of ultrasonic waves. The tip 2 attaches a sterilized new product during surgery. Depending on the purpose and site of the surgery, several types with different tip shapes are mainly prepared, and they are replaced with a wrench 3 during surgery. After use, the screw 21 can be loosened with the wrench 3, removed, and discarded.

FIG. 3 shows a perspective view of the chip 2. The tip 2 is made of titanium, has a length of about 20 mm, the outer diameter of the needle part 22 is about 0.9 mm, and a thin hole 26 is formed at the center. A tapered portion 23 is formed at the root of the chip 2, and two concave portions 24 are provided at a part of the tapered portion 23. The concave portion 24 is formed by engraving the tapered surface of the tapered portion 23, and the wrench 3 (FIG. 4) is formed with two convex portions 31 so as to mesh with the concave portion 24.

When the needle portion 22 of the tip 2 is inserted into the center hole 32 of the wrench 3 to the tapered portion 23 and the tip 2 is turned so that the screw 21 is screwed into the screw 11, the concave portion 24 and the convex portion 31 are engaged. The wrench 3 has a large outer diameter of about 40 mm in order to obtain a large rotating torque, and is further formed in a hexagonal shape.

Next, a procedure for mounting the chip 2 will be described by taking a right-handed person as an example Procedure 1. Hold the wrench 3 in your left hand and take the tweezers with your right hand

Procedure 2. Insert the needle part 22 into the hole 32 of the wrench 3 by holding the tip 2 with tweezers.

Procedure 3 Hold the wrench 3 with the insert 2 in your right hand

[0010] Procedure 4. Hold the handpiece 1 in the left hand so that the screw 11 of the handpiece 1 and the screw 21 of the chip 2 (hereinafter referred to as both screws) face each other.

Procedure 5 While turning the tip 2 with the wrench 3, turn it clockwise as much as you can. While turning, the two concave portions 24 of the tip 2 and the two convex portions 31 provided on the wrench 3 mesh with each other, and the tip 2 rotates with the rotation of the wrench 3. At this time, the angle that can be turned to the maximum varies from person to person, and is about 200 degrees for a person with a long finger and about 160 degrees for a person with a short finger.

Procedure 6 When the tip 2 is turned and the screw 21 bites, in order to further turn the tip 2, the wrench 3 is once pulled out of the tip 2 to 3 mm, the engagement between the recess 24 and the projection 31 is disengaged, the rotation is returned to the left, and the clock is turned again, Screw in the screw 21. This is repeated four to five times.

Procedure 7 When the wrench 3 stops rotating, that is, when both screws are tightened, turn the wrench 3 with a stronger force and tighten both screws to the end.

Thus, the mounting of the chip 2 is completed. However, if both screws bite in when the procedure 5 is completed, the procedure proceeds to the procedure 6. If the two screws do not bite, if the wrench 3 is to be pulled out of the chip 2, the wrench 3 will come with the tip 2. That is, the chip 2 falls off from the handpiece 1. If you turn the wrench 3 again as it is explained below, both screws will not bite.

There are two reasons why both screws do not bite. First, both screws are single-thread screws, and there is only one chance to bite each other in one revolution. Another reason is that the wrench 3 starts to rotate the tip 2 only when the recess 24 of the tip 2 and the projection of the wrench 3 engage.

However, there are only two concave portions 24 and two convex portions 31, and a maximum rotation of one half is required before they engage with each other. There is a maximum of 1 rotation + 1/2 rotation = one and a half rotation before the two screws bite due to the combination of these two reasons. When the two screws do not bite in this way, even if the procedure 5 is simply repeated, the bit does not bite.

In such a case, the handpiece 1 held in the left hand is once released from the hand, placed on a desk or the like, the wrench 3 containing the chip 2 is once held in the left hand, and is again held in the right hand. At this time, the wrench 3 is turned at an appropriate angle. Then repeat step 5. At this time, the trouble of switching the handpiece 1 to the left hand again occurs. It was found that the falling off of the tip 2 was inefficient and the operator felt annoyed.

If both screws bite in step 5, steps 6 and 7 can be performed without re-doing. That is, whether or not both screws bite in the first time of the procedure 5 greatly affects the efficiency of the entire chip mounting. Therefore, data was obtained as to how many times dropout occurs when step 5 is performed a certain number of times.

Prior to the experiment, the trainees practiced the above-mentioned procedures 1 to 5 50 times in advance in order to become proficient to some extent. Thereafter, the procedure from the procedure 1 to the procedure 5 was performed once, and three subjects (A, B, C) performed the experiment 50 times in total. As a result, the number of times that both screws did not bite in the procedure 5 was 16 times in the case of the subject A among 50 times. Similarly, B was 22 times and C was 14 times. With an average of about 17.3 times for three people, 34% of the 50 times, or about once every three times, would have redone step 5.

It is considered that the individual differences are caused by the difference in the rotation angle due to the length of the finger and the individual difference in the skills such that the axes of both screws could not be matched.

[0021]

[Problems to be solved by the invention]

 In the above procedure for fixing the tip 2 to the handpiece 1, the retry of the procedure 5 is actually performed once in three times, and it can be said that the work performed during the operation is very efficient. However, improving the efficiency of mounting the chip 2 has been an important issue. If the concave portion 24 meshes with the convex portion 31 with a smaller rotation angle, the rate of redoing can be reduced, and the chip can be mounted more quickly. SUMMARY OF THE INVENTION The present invention provides an ultrasonic surgical apparatus for quickly exchanging tips by increasing the number of concave portions 24 and convex portions 31 to three each.

[0022]

[Means for Solving the Problems]

 Means for solving the problems according to the first aspect of the present invention is characterized in that a convex portion of a screw tightening wrench and three concave portions of a chip that mesh with the convex portion are provided, and an ultrasonic wave for quickly exchanging the chip is provided. A surgical device is provided.

[0023]

FIG. 1 is a perspective view of a chip 2 according to the present invention. The tip 2 is formed of a titanium material, is provided with a screw 21 at a root having a total length of about 20 mm, and is formed at an end thereof with an elongated tubular needle part 22 having an outer diameter of about 0.9 mm. The center of the dollar portion 22 is provided with a hole 26. Further, a tapered portion 23 is provided between the needle portion 22 and the screw 21.

The concave portions 24 formed on the surface of the tapered portion 23 are provided at three places. The concave portion is formed by engraving the surface of the tapered portion 23. The shaving depth from the surface is about 0.5 mm to 0.7 mm, and the shape of the concave portion 24 is substantially trapezoidal as shown in FIG. 1, and the three concave portions are formed so that the trapezoid is not connected to each other.

FIG. 6 shows the wrench 3 of the present invention. FIG. 6 is a side view of the wrench 3 as viewed from the direction of the hole 32 of the wrench 3 shown in FIG. The protrusions 31 are provided at three places and are formed as substantially square protrusions, and the size of the protrusions is smaller than the recess 24 so that they can easily enter the recess 24 of the chip 2 and easily mesh therewith. The outer shape is formed as shown in FIG.

[0026]

[Effect of the invention]

 The procedure for mounting the chip according to the present invention is performed in the same manner as in the above conventional example. In the case where the problem solving means according to the first aspect of the present invention is used, that is, by increasing the number of the concave portions 24 and the number of the convex portions 31 to three places, respectively, until the tip 2 and the wrench 3 engage with each other in the above procedure 5, The rotation angle is maximum, and can be reduced to 従 来 of the conventional rotation. That is, meshing can be performed with a smaller rotation angle. The experimental results are described below.

The procedure 5 was performed on the three subjects A, B, and C using the present invention. As a result, the number of times that the screw did not bite out of 50 times was 9 in the case of the subject A. Similarly, B was 14 times, C was 8 times, and the average of the three was 10.3 times.

Summarizing the trials of procedure 5 above, the number of times that the screw did not bite was 50 notches in two places of notches A16 times B22 times C14 times 17.3 times in average three places of notches A nine times B14 Times C 8 times 10.3 times on average

At one time, in two cutout portions, 17.3 / 50 = 0.35, that is, the screw did not bite about once every three times and failed. However, at three notches, 10.3 / 50 = 0.21, that is, the screw does not bite about once every five times. I got a good result. From this, by setting the cutout portions 24 of the chip 2 to three places, the failure rate that both screws do not bite when mounting the chip 2 was reduced, and the time required for mounting the chip 2 was shortened. . The subjects also stated that the reduction in rework due to failures was consistently less frustrating.

As is clear from the above description, according to the present invention, by providing three convex portions of the screw tightening wrench and three concave portions of the chip that mesh with the convex portions, the two screws are eroded when the chip 2 is mounted. The number of unsuccessful failures was greatly reduced to one out of five compared to the conventional example in which one out of three failures was observed. As a result, the time required to mount the tip has been significantly reduced, and rapid surgery has become possible. It was also found that it was effective in reducing the irritation of workers.

[Brief description of the drawings]

FIG. 1 is a perspective view of a chip of the present invention.

FIG. 2 is a partial cross-sectional view showing an ultrasonic surgical apparatus.

FIG. 3 is a perspective view showing a conventional chip.

FIG. 4 is a diagram showing a conventional wrench.

FIG. 5 is a partial sectional view showing a side surface of the wrench.

FIG. 6 shows the wrench of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Handpiece 11 Screw 2 Tip 21 Screw 22 Needle part 23 Taper part 24 Concave part 26 hole 3 Wrench 31 Convex part 32 hole

Claims (1)

[Utility model registration claims] 1. An ultrasonic surgical apparatus in which a tip is detachably attached to a handpiece by a screw, three projections 31 of a screw wrench and three recesses 24 of the tip engaging with the projections 31 are provided. Ultrasonic surgical device characterized by the following