KR20210057953A - Chopper for cataract surgery and customized method for processing the chopper - Google Patents

Abstract

The present invention relates to a chopper for cataract surgery. According to the present invention, the chopper for cataract surgery comprises: a handle unit to be gripped; a shaft extending in a longitudinal direction from the handle unit; a needle bent in a plurality of stages from the shaft and extending; and a light irradiation unit exposed at a first bent portion of the needle extending from the shaft and irradiating light toward an end of the needle. According to the present invention, it is possible to increase the convenience of cataract surgery by irradiating light directly in a direction of a crystalline lens and operating for a target.

Description

Chopper for cataract surgery and customized method for processing the chopper}

The present invention relates to a chaper for cataract surgery.

In ophthalmic surgery, doctors generally operate with a microscope. The microscope irradiates light to the cornea at a position perpendicular to the patient's eyeball, enlarges the image of the eyeball, and provides it to the doctor so that a more sophisticated operation can be performed.

The so-called cataract surgery in which the lens is removed and an artificial lens is inserted in order to resolve the cloudiness in the lens of the eye is also performed through such a microscope.

During cataract surgery, doctors mainly use microscope illumination as a light source. Since these microscopes are commonly used not only in cataract surgery but also in various ophthalmic operations, the characteristics of each operation cannot be reflected. Therefore, situations that are difficult to operate only with a light source of a microscope may occur depending on the specific location of the target in the eye or the surgical method.

The light irradiated from the microscope is directly incident in a direction perpendicular to the cornea due to the nature of the microscope, so the light can reach the retina.

In other words, the target of cataract surgery is related to the lens located in front of the retina, but the light used for surgery reaches the retina and uses the reflected light, but due to the reflection of light from the cornea, sufficient light does not penetrate and the surgery target is rather There is a problem that is not clearly visible.

This problem hinders the visibility of the operation target and thus increases the likelihood of occurrence of additional complications due to negligence during the operation.

In addition, as the light itself, the strong light of the microscope may directly reach the retina for a long time, causing a problem of damaging retinal cells.

Therefore, there is a need to develop tools or devices for more sophisticated cataract surgery.

An object of the present invention for solving the above technical problem is to propose a configuration that improves visibility and makes surgery more convenient.

More specifically, it is an object of the present invention to propose an optimal needle structure in consideration of the characteristics of cataract surgery itself.

In addition, an object of the present invention is to propose a manufacturing method according to the design of a specific structure suitable for customized conditions.

The cataract surgery chaper according to the present invention for solving the above technical problem is a handle portion to be gripped; A shaft extending in a longitudinal direction from the handle portion; A needle bent and extended from the shaft to a plurality of ends; And a light irradiation unit that is exposed at an initial bent portion of the needle extending from the shaft and irradiates light toward the end of the needle.

The end of the needle is preferably bent in a direction adjacent to the optical axis of the light irradiated from the light irradiation unit, and has a length determined not to contact the optical axis.

The needle extends from the shaft and is first bent in a direction away from the central axis in the longitudinal direction; A second bent portion extending from the first bent portion and bent in a direction closer to a longitudinal central axis; And a needle end extending from the second bent portion.

It is preferable that a first angle formed by the first bent portion with the central axis in the longitudinal direction is smaller than a second angle at which the second bent portion is bent, and the length of the first bent portion is longer than that of the second bent portion.

It is preferable that the outside of the connecting portion of the first bent portion and the second bent portion is continuous in a curved surface having a predetermined curvature.

It is preferable that the light irradiation unit further includes a lens unit, and a focal point of the lens unit is adjacent to an end of the needle.

It is preferable that the end of the needle further includes a third bent portion bent in one side in the length direction from the second bent portion.

Receiving a first angle of the first bent portion, which is first bent in a direction away from the longitudinal central axis in which the shaft of the needle extends, according to a user request; Determining a second angle of a second bent portion, which is extended to the input first angle and then bent secondarily in a direction closer to the longitudinal central axis, according to a predetermined condition; And processing the needle according to the determined first angle and the second angle, and a light irradiation portion is formed that is exposed to the outside at the first bent portion of the needle and irradiates light toward the end of the needle.

It is preferable that the end of the needle is bent in a direction adjacent to the optical axis of the light irradiated from the light irradiation unit, and has a length determined so as not to contact the optical axis.

It is preferable that the first angle formed by the first bent portion with the central axis in the longitudinal direction is smaller than the second angle at which the second bent portion is bent, and the length of the first bent portion is longer than that of the second bent portion.

The step of processing the outer side of the connecting portion of the first bent portion and the second bent portion to be continuous with a curved surface having a predetermined curvature.

Further comprising the step of further forming a lens portion so that the focus of the light irradiated to the light irradiation portion is adjacent to the end of the needle.

According to the present invention, it is possible to increase the convenience of cataract surgery by directly irradiating light in the lateral direction of the lens and allowing the target to be operated.

In addition, according to the present invention, since the interference between the needle for surgery and light is minimized, the visibility of the surgical site is increased, and the area necessary for the surgery can be directly illuminated to see in detail, it is possible to prevent accidents due to negligence.

In addition, it is possible to prevent damage to tissues other than surgery by minimizing the arrival of light outside the surgical site and reduce stress applied to the tissues.

In addition, a surgeon who proposes a structure suitable for the characteristics of the surgeon and performs the operation can perform the operation in the method and posture that is most suitable for him, thereby increasing the satisfaction of the operation.

1 is a view showing a chaper for cataract surgery according to an embodiment of the present invention.
2 to 4 are views showing in more detail the configuration of a needle of a chaper for cataract surgery according to an embodiment of the present invention.
5 to 6 are diagrams illustrating a specific surgical method using a chaper for cataract surgery according to an embodiment of the present invention.
7 is a view showing a needle processing method of the chaper for cataract surgery according to the present embodiment.

The following content merely exemplifies the principles of the invention. Therefore, although those skilled in the art are able to implement the principles of the invention and invent various devices included in the concept and scope of the invention, although not clearly described or illustrated herein. In addition, it should be understood that all conditional terms and examples listed in the present specification are, in principle, clearly intended only for the purpose of understanding the concept of the invention, and are not limited to the embodiments and states specifically listed as described above. .

The above-described objects, features, and advantages will become more apparent through the following detailed description in connection with the accompanying drawings, and accordingly, a person of ordinary skill in the technical field to which the invention pertains will be able to easily implement the technical idea of the invention. .

In addition, in describing the invention, when it is determined that a detailed description of a known technology related to the invention may unnecessarily obscure the subject matter of the invention, a detailed description thereof will be omitted. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram showing a chopper 100 according to an embodiment of the present invention.

Referring to FIG. 1, the charger 100 according to the present embodiment may include a handle unit 110, a shaft 120, a needle 130, and a light irradiation unit 140.

The handle unit 110 is gripped by a user, and may further include a tubular guide hole (not shown) to allow light provided from a light source therein to be irradiated to the outside.

Specifically, a tubular guide hole may be formed inside the handle unit 110, and an optical fiber may be inserted into the guide hole to allow light to be irradiated to the outside.

In addition, although not shown, in the present embodiment, the chaper 100 may be replaced for each patient for hygiene purposes, and thus the handle unit 110 may further include a replacement configuration for coupling and disengagement.

The shaft 120 is formed to extend from the handle portion 110 in the longitudinal direction.

The shaft 120 may be made of a material that maintains strength, such as metal or plastic, and a guide hole for guiding light therein may be formed to be continuous with the guide hole of the handle unit 110 described above.

That is, the guide hole on the shaft 120 side may be formed in a closed tubular shape along the extending direction of the shaft 120, but may be formed to be exposed to the outside from the portion where the needle 130 is formed.

The light source guided through the exposed hole is irradiated to the outside, and the chaper 100 according to the present embodiment directly illuminates the actual surgical target.

The needle 130 is bent and extended from the shaft 120 to a plurality of ends, and the end may be formed in the shape of a sharp blade.

Specifically, the needle 130 includes a plurality of bent portions, and the user may directly cut or tear the tissue using the needle 130.

The light irradiation unit 140 is exposed at the first bent portion of the needle 130 extending from the shaft 120 and irradiates light toward the end of the needle 130.

The light irradiation unit 140 according to the present embodiment can increase the convenience of cataract surgery by directly irradiating light in the direction of the lens to be operated and allowing the target to be operated.

Hereinafter, the configuration of the needle 130 of the charger 100 will be described in more detail with reference to FIG. 2.

2 is a view showing in more detail the configuration of the needle 130 of the charger 100 according to an embodiment of the present invention.

Referring to FIG. 2, the needle 130 according to the present embodiment may include a first bent portion 22, a second bent portion 24, and a needle end 26.

In this embodiment, the bent portion refers to a portion extending from the bent point, but the bent portion does not necessarily need to be physically partitioned and may be configured in a continuous shape. In addition, the needle end 26 may also be configured as part of a continuous surface.

Accordingly, in the present embodiment, detailed configurations constituting the needle 130 are functionally divided to determine the structure of the needle 130 as a whole and provide an effect accordingly.

First, in the present embodiment, the bent portion of the needle 130 is such that the end portion 26 of the needle is bent in a direction adjacent to the optical axis of the light irradiated from the light irradiation unit 140, but not in contact with the optical axis.

In this embodiment, the optical axis is an axis that determines the direction in which the irradiated light proceeds straight, and in this embodiment, it may correspond to the central axis in the longitudinal direction of the shaft 120, but the light directly irradiated by the light irradiation unit 140 The shadow that may be generated by reaching the needle end 26 is minimized, and the visibility of the surgical object is increased.

Among the bent portions, the first bent portion 22 that is first bent at the shaft 120 extends from the shaft 120 and is first bent in a direction away from the longitudinal central axis.

That is, the shaft 120 may be bent outward in the lengthwise direction in which the shaft 120 extends.

Through this, a space in which the needle end 26 can be separated from the optical axis of the irradiated light can be secured.

In addition, the first bent portion 22 extends to a predetermined length from the bent point so that the needle end 26 is positioned in front of the light irradiation portion 140 by a predetermined distance. Positioning in front of a predetermined distance allows the user to perform surgery while the light irradiated from the light irradiation unit 140 sufficiently illuminates the operation target and its surroundings.

The second bent part 24 extends after being bent at the first bent part 22. The bending direction may be a direction closer to the central axis in the longitudinal direction opposite to the first bent portion 22.

That is, the second bent portion 24 may be bent inward toward the shaft 120 again.

Through this, light can be irradiated to the end of the needle 26 in direct contact with the surgical object without interference of other configurations.

However, as described above, in the present embodiment, the angle and length of the second bent portion 24 may be limited in order to minimize the shadow generated by the light reaching the needle end 26.

This will be described in more detail with reference to FIG. 3.

3 is a view showing in more detail the configuration of the needle 130 according to an embodiment of the present invention.

In this embodiment, the bending angle of the first bent portion 22 and the bending angle of the second bent portion 24 of the needle 130 may have values according to a predetermined condition.

In this embodiment, the predetermined condition may limit the angles of the first bent portion 22 and the second bent portion 24 so that the needle end 26 does not contact the optical axis of light irradiated from the light irradiation unit 140. .

That is, the first bent portion 22 of the needle 130 may be bent at a first angle α under a predetermined condition.

Specifically, in the present embodiment, the first angle α may be defined based on a central axis (dotted line) in the longitudinal direction in which the shaft 120 extends.

Also, the second bent portion 24 may be bent at a second angle β.

In this embodiment, the second angle β may be determined as the inner angle in the direction in which the second bent portion 24 is bent.

As a condition for the above bending angle, in the present embodiment, the first angle α may be set to have a value smaller than the second angle β.

That is, due to the restriction according to the angle, the needle end 26 is relatively separated from the light irradiation unit 140 compared to the needle 130 having opposite angles at the same length, thereby ensuring a wider field of view for the user. Allows the operation to proceed with one left.

In addition, the predetermined condition in the present exemplary embodiment may limit the length (a) of the first bent portion 22 and the length (b) of the second bent portion 24.

In this embodiment, the length (a) of the first bent portion 22 is longer than the second bent portion 24 as a length extending after being bent at the bent portion.

When the length (b) of the second bent part (24) is longer than the length (a) of the first bent part (22) when bent at the same angle, the needle end (26) passes the optical axis, thus obstructing the view due to the shadow Can get worse.

In addition, if the needle end 26 is too far away from the optical axis as an additional condition, it may not receive a lighting effect and the user may be difficult to recognize the surgical object that the needle 130 encounters. It is also possible to limit.

For example, in this embodiment, the needle end 26 is not in contact with the optical axis as a first condition, and the second end of the needle 26 is in contact with or is separated within a predetermined distance based on the extension line according to the width of the shaft 120. It is also possible to determine the bending angle of the needle 130 and the length of each bent portion according to conditions.

Above, the bending angle of the first bent part 22 and the second bent part 24 according to the present embodiment and the length that extends after being bent are such that the needle end 26 does not directly contact the optical axis, and the shadow is caused by direct sunlight. Is minimized, and is spaced apart from the light irradiation unit 140 to secure a wider field of view.

In addition, in the present embodiment, the limitation on the first bent portion 22 and the second bent portion 24 is to relatively adjust the lighting effect of the light irradiation unit 140 and the shadow effect generated by the light. In addition, it may further include a configuration for adjusting the straightness of the light.

Specifically, in the present embodiment, the light irradiation unit 140 may further include a lens unit 142 in addition.

At this time, the lens unit 142 may be configured to polish the exposed end of the optical cable and to control the irradiation angle of light by giving a predetermined R to the end, or may be formed by processing and attaching to the optical cable in a separate configuration. It is possible.

That is, the light irradiation unit 140 according to the present embodiment includes the lens unit 142, so that the light guided through the guide unit in the shaft 120 is irradiated through the lens unit 142 before being emitted to the outside. have.

In this embodiment, the lens unit 142 may refract irradiated light in the focal direction.

In this case, the lens unit 142 may form the focus of the irradiated light at a position where the lens axis and the extension line of the needle end 26 contact each other.

Alternatively, it is possible to form a focus at the intersection of the lens axis and the waterline lowered from the end of the needle end 26 to the lens axis.

Through this, it is possible to guide the irradiated light to illuminate the position adjacent to the needle end 26 as much as possible, and increase the operating convenience of the operator.

In addition, referring to FIG. 4, in this embodiment, the charger 100 may include an additional configuration according to characteristics of a surgical action.

Specifically, the outer side of the connecting portion of the first bent portion 22 and the second bent portion 24 of the chopper 100 may be continuous with a curved surface 42 having a predetermined curvature.

That is, it may be configured to have a curved surface 42 having a predetermined R value as shown in FIG. 4.

In order to prevent the occurrence of side effects or complications during surgery, it is necessary to minimize damage to other parts of the surgery.

Specifically, in the case of performing an operation using the chaper 100 according to the present invention, parts other than the needle end 26 of the chaper 100, which are in contact with the actual surgical target and tear or cut the tissue, are also applied to the tissue according to the surgical action. Contact can cause repetitive stress.

Therefore, it is necessary to prevent damage to other tissues caused by such stress.

In particular, in this embodiment, the connecting portion of the first bent portion 22 and the second bent portion 24 of the chaper 100 may constitute an edge at the bent portion, and the edge of the connecting portion is They are located on the outside in the longitudinal direction and may unintentionally come into contact with other tissues.

Accordingly, as an additional embodiment, the edge of the bent portion connecting portion of the charger 100 may be smoothly configured as a curved surface 42.

Hereinafter, a specific surgical method using the chopper 100 according to an embodiment of the present invention will be described with reference to FIGS. 5 and 6.

In the cataract surgery using the chaper 100 according to the present embodiment, the turbid lens 12 is fragmented with the chaper 100 and the fragmented lens 12 is removed through an ultrasonic emulsifier.

Referring to FIG. 5, first, a part of the cornea 10 may be cut in order for the chopper 100 to enter the eyeball.

The chaper 100 enters through the incisional portion of the cornea 10, passes through the dilated pupil, approaches the capsular bag surrounding the lens 12, and the user performs cataract surgery.

Specifically, after removing the anterior capsule located at the outer foot from the capsular bag, the inner capsular body 12 is cut or torn with the needle end 26 of the capper 100.

At this time, since the chaper 100 according to the present embodiment directly irradiates light to the lens 12 that is an operation target, the user can more precisely grasp the operation position, the shape of the lens, and the position of the decomposition product. In addition, a wider field of view can be secured through a structure that is bent according to conditions, and surgery can be performed in a state in which shadows are minimized.

Specifically, the user can remove only the lens 12 from the capsular bag, and since the depth of the capsular bag can be checked by direct illumination, damage to the posterior bag 14 surrounding the inner side of the capsular bag can be minimized.

After removing the lens 12 through the above process, the cataract surgery can be completed by inserting a new artificial lens into the capsular bag.

Further, referring to FIG. 6, the charger 100 may be entered at various angles.

In general, the chaper 100 is gripped by one hand of the user and the operation is proceeded while entering from one direction.Through the chaper 100, the posterior capsule 14 and the lens 12 of the capsular bag are rotated at various angles to separate them. And can be used for surgery.

For example, the charger 100 may be used in the form as shown in FIG. 6.

In the case of FIG. 6, the bent portion of the needle 130 entered into the capsular bag may contact the posterior capsule 14 to inflict damage.

Accordingly, in the present embodiment, as described above with reference to FIG. 4, by forming a curved surface on the bent portion of the needle 130, it is possible to further reduce the stress applied to the posterior capsule 14.

That is, referring to the embodiment according to the above surgical method, the chaper 100 for cataract surgery according to the present invention directly irradiates light to the surgical target with the light irradiation unit 140, but the shadow of the sharp needle end 26 through the bent portion By minimizing it, the visibility of the surgical site is increased. In addition, it is possible to adjust the focus of the irradiated light through the additional lens unit.

Furthermore, to protect other tissues during surgery, a curved surface can be formed on some sharp edges and side effects can be minimized.

In addition, although not shown, as an additional embodiment, the needle 130 may include a third bent portion that is bent again in one side in the length direction from the second bent portion 24, and the third bent portion is a condition according to the above-described embodiment. And the curved surface may be formed in a continuous portion of the second bent portion 24 and the third bent portion.

In addition, the present invention proposes a specific processing method to reflect the user's request for the user's convenience, but to generate the above-described effect as it is.

Hereinafter, a method of processing the needle 130 of the chaper 100 for cataract surgery according to the present embodiment will be described with reference to FIG. 7.

First, the first angle of the first bent portion 22, which is first bent away from the central axis in the longitudinal direction extending from the needle 130, is input according to a user's request (S100).

The user can empirically recognize the angle that is most convenient for them through repetitive surgical actions.

That is, the optimum angle may be customized, and the device for processing the needle 130 (hereinafter referred to as the needle 130 processing device) may receive specific user-requested angle information.

When the user requests the first angle to be bent at the first angle, the needle 130 processing apparatus according to the present embodiment extends to the first angle input according to the above predetermined condition, and then extends the second angle toward the center axis in the longitudinal direction. A second angle of the second bent portion 24 that is differentially bent may be determined (S200).

In addition, the lengths of the first bent portion 22 and the second bent portion 24 along with the angle may be determined according to the above-described condition (S200).

The needle 130 is processed according to the finally determined first and second angles (S300).

The design values for the above needle 130 processing may be implemented in a recording medium that can be read by a computer or a similar device using software, hardware, or a combination thereof.

Accordingly, through this, the needle 130 processing apparatus can process the customized needle 130 that fits the user's required angle, and finally, the needle 130 can be manufactured to produce the chaper 100 processed.

In this case, a light irradiation unit 140 may be formed that is exposed to the outside at the first bent portion of the machined needle 130 and irradiates light toward the end of the needle 130.

In addition, in the method of processing the needle 130 of the chaper 100 for cataract surgery according to the present embodiment, the outer side of the connecting portion of the first bent portion 22 and the second bent portion 24 has a predetermined curvature. It may further include the step of processing to be continuous in a curved surface.

In addition, the method of processing the needle 130 of the chaper 100 for cataract surgery according to the present embodiment further forms a lens unit such that the focus of the light irradiated to the light irradiation unit 140 is adjacent to the end of the needle 130. It may further include a step.

In addition, as an additional embodiment, although FIG. 7 illustrates that the user requests the first angle, it is possible to request the bending angle of the second bent portion 24 and determine the first angle accordingly and process it.

Alternatively, when the user requests the first angle and the second angle, it is possible to determine the length of the first angle and the length of the second angle to maximize the effect under the above-described conditions.

According to the present invention, the convenience of cataract surgery can be improved by irradiating light directly in the direction of the lens and allowing the target to be operated.

In addition, according to the present invention, it is possible to minimize the interference between the needle and light for surgery to increase the visibility of the surgical site and prevent the occurrence of accidents due to negligence.

In addition, it is possible to prevent damage to tissues other than surgery by minimizing the arrival of light outside the surgical site and reduce stress applied to the tissues.

In addition, a surgeon who proposes a structure suitable for the characteristics of the surgeon and performs the operation can perform the operation in the method and posture that is most suitable for him, thereby increasing the satisfaction of the operation.

On the other hand, in the specification and claims, terms such as "first", "second", "third" and "fourth", if any, are used to distinguish between similar elements, but not necessarily It is used to describe a specific sequence or order of occurrence. It will be understood that the terms so used are compatible under appropriate circumstances such that the embodiments of the invention described herein may operate in sequences other than those shown or described herein, for example. Likewise, where a method herein is described as comprising a series of steps, the order of those steps presented herein is not necessarily the order in which those steps can be performed, and any described steps may be omitted and/or may be omitted herein. Any other steps not described could be added to the method.

The above description is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the technical field to which the present invention belongs can make various modifications, changes, and substitutions within the scope not departing from the essential characteristics of the present invention. will be.

Accordingly, the embodiments disclosed in the present invention and the accompanying drawings are not intended to limit the technical idea of the present invention, but to describe, and the scope of the technical idea of the present invention is not limited by these embodiments and the accompanying drawings. . The scope of protection of the present invention should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

Claims (12)

A handle portion to be gripped;
A shaft extending in the longitudinal direction from the handle portion;
A needle bent and extended from the shaft to a plurality of ends; And
A chaper for cataract surgery, characterized in that it comprises a light irradiation unit exposed at the first bent portion of the needle extending from the shaft to irradiate light toward the end of the needle. The method of claim 1,
The end of the needle is bent in a direction adjacent to the optical axis of the light irradiated from the light irradiation unit, the chaper for cataract surgery, characterized in that it has a length determined not to contact the optical axis The method of claim 1,
The needle extends from the shaft and is first bent in a direction away from the central axis in the longitudinal direction;
A second bent portion extending from the first bent portion and bent in a direction closer to a longitudinal central axis; And
Chopper for cataract surgery, characterized in that it comprises a needle end extending from the second bent portion. The method of claim 3,
Cataract surgery, characterized in that the first angle formed by the first bent part with the central axis in the longitudinal direction is smaller than the second angle at which the second bent part is bent, and the length of the first bent part is longer than that of the second bent part Dragon Chopper. The method of claim 3,
A chaper for cataract surgery, characterized in that the outer side of the connecting portion of the first bent portion and the second bent portion is continuous with a curved surface having a predetermined curvature. The method of claim 3,
The light irradiation unit further includes a lens unit,
The focus of the lens unit is a chaper for cataract surgery, characterized in that adjacent to the end of the needle. The method of claim 3,
The needle end is a chaper for cataract surgery, characterized in that it further comprises a third bent portion bent in a longitudinal direction from the second bent portion. Receiving a first angle of the first bent portion, which is first bent in a direction away from the longitudinal central axis in which the shaft of the needle extends, according to a user request;
Determining a second angle of a second bent portion, which is extended to the input first angle and then bent secondarily in a direction closer to the longitudinal central axis, according to a predetermined condition; And
Including the step of processing the needle according to the determined first angle and second angle,
The needle processing method of a chaper for cataract surgery, characterized in that a light irradiation part is formed that is exposed to the outside at the first bent portion of the needle to irradiate light toward the end of the needle. The method of claim 8,
The end of the needle is bent in a direction adjacent to the optical axis of the light irradiated by the light irradiation unit, the needle processing method of the chaper for cataract surgery, characterized in that to have a length determined not to contact the optical axis. The method of claim 9,
The first angle formed by the first bent portion and the longitudinal central axis is smaller than the second angle at which the second bent portion is bent, and the length of the first bent portion is longer than that of the second bent portion. The needle processing method of the chaper for cataract surgery. The method of claim 9,
The needle processing method of a chaper for cataract surgery, characterized in that it further comprises the step of processing the outer side of the connecting portion of the first bent portion and the second bent portion to a curved surface having a predetermined curvature. The method of claim 8,
Further comprising the step of further forming a lens unit such that the focus of the light irradiated to the light irradiation unit is adjacent to the end of the needle.

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