JP2022136918A - puncture needle - Google Patents

Abstract

To provide a puncture needle having improved visibility in a tip end portion thereof.SOLUTION: A puncture needle 100 includes a rod-shaped body 1 and a blade surface part 2 formed in a tip end of the body 1. The blade surface part 2 includes a blade surface region 4 in which a blade surface 40 crossing with an axial center G of the body 1 is formed. The blade surface region 4 includes a reflection control region 5 in which a reflection structure is formed, the reflection structure reflecting ultrasonic wave in a direction different from that of the blade surface 40.SELECTED DRAWING: Figure 1

Description

The present invention relates to a puncture needle.

Patent Literature 1 discloses an ultrasound-guided puncture needle and an indwelling needle. The ultrasound-guided puncture needle described in Patent Document 1 constitutes the inner needle of the indwelling needle. The ultrasound-guided puncture needle has an uneven portion that reflects ultrasound waves. The concave-convex portion includes a groove provided on the outer peripheral surface in the vicinity of the tip portion having the blade surface, and protuberances provided on both sides of the groove.

In Patent Document 1, ultrasonic waves are transmitted from an ultrasonic imaging device, the position of a blood vessel to be punctured is confirmed, ultrasonic waves are irradiated to the punctured puncture needle, and an image obtained based on the reflected waves is used to perform the puncture. A case is disclosed in which the operation is performed while confirming the position of the needle. In order to accurately determine the position of the puncture needle, it is important to obtain a clear echo image. It is pointed out that it is necessary for the reflected wave of

WO2011/077837

When using a puncture needle, it is important to be able to grasp the position of the tip portion (for example, blade surface) of the puncture needle when catching blood vessels and tumor cells. However, in the prior art as described in Patent Document 1, the visibility of the tip portion of the puncture needle is still insufficient. Therefore, it is desired to provide a puncture needle with improved visibility of the tip portion.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a puncture needle with improved visibility of the tip portion.

A puncture needle according to the present invention for achieving the above object comprises:
a rod-shaped main body;
and a blade surface portion formed at the tip portion of the main body portion,
The blade surface portion has a blade surface region in which a blade surface that intersects the axis of the main body portion is formed,
The blade surface region includes a reflection control region formed with a reflection structure that reflects ultrasonic waves in a direction different from that of the blade surface.

The puncture needle according to the present invention further comprises
The reflective structure may have a reflective surface facing in a different direction from the blade surface.

The puncture needle according to the present invention further comprises
The reflecting surface may be a surface parallel to the axis of the main body.

The puncture needle according to the present invention further comprises
The reflective structure may be a recess having the reflective surface.

The puncture needle according to the present invention further comprises
The recess may be a groove extending in a direction intersecting the axis of the main body.

The puncture needle according to the present invention further comprises
The reflecting surfaces may include a first reflecting surface and a second reflecting surface facing in a direction different from that of the first reflecting surface.

The puncture needle according to the present invention further comprises
The blade face portion may further have a resin film covering the reflection control region.

The puncture needle according to the present invention further comprises
The blade surface portion may have an air layer between the coating and the reflecting surface.

The puncture needle according to the present invention further comprises
The coating may adhere to the reflective surface.

The puncture needle according to the present invention further comprises
The blade surface region includes a non-control region where the reflective structure is not formed,
The reflection control area may be surrounded by the non-control area.

A puncture needle with improved visibility of the tip portion can be provided.

It is the figure which looked at the front-end|tip part of the puncture needle by the top view. Fig. 3 is a side view of the puncture needle and its blade surface; FIG. 4 is an explanatory diagram of a state in which a probe is detecting a blade surface; It is the partial enlarged view seen by the side view from the inside of the opening part of a blade surface part. 4 is another side view of the puncture needle and its blade surface. FIG. FIG. 10 is another explanatory diagram of a state in which the probe is detecting the blade surface. It is another partial enlarged view seen from the side view from the inside of the opening of the blade surface. FIG. 4 is another top view of the tip of the puncture needle. FIG. 9 is a cross-sectional view taken along line AA of FIG. 8; It is another partial enlarged view seen from the side view from the inside of the opening of the blade surface. FIG. 10 is a perspective view of the reflection control region when grooves are formed; FIG. 10 is a perspective view of a reflection control region with a rough surface; It is another partial enlarged view seen from the side view from the inside of the opening of the blade surface. FIG. 10 is a diagram showing a reflection structure formed of an aggregate of polyhedrons; It is a partially enlarged cross-sectional view of the cross section of the blade face portion. It is a partially enlarged cross-sectional view of a portion including an air layer in the blade surface.

A puncture needle according to an embodiment of the present invention will be described based on the drawings.

[First Embodiment]
[Description of overall configuration]
FIG. 1 illustrates the distal end side of a puncture needle 100 according to this embodiment as viewed from above. As shown in FIG. 1 , the puncture needle 100 includes a rod-shaped main body 1 made of metal and a blade surface 2 formed at the tip of the main body 1 . The blade face portion 2 has a blade face region 4 in which a blade face 40 intersecting the axis G of the body portion 1 is formed. The blade surface region 4 includes a reflection control region 5 formed with a reflection structure that reflects ultrasonic waves in a direction different from that of the blade surface 40 .

[Description of each part]
As shown in FIG. 1, the main body 1 is a tubular tubular body having a hollow portion penetrating in the longitudinal direction of the tube. The body portion 1 of this embodiment has a circular outer shape in a cross section that intersects the axis G of the pipe. The body portion 1 allows fluid supplied from a syringe of an injector or the like to flow through the inside of the cylinder. Note that the extending direction of the axis G is the same as the longitudinal direction of the body portion 1 . Hereinafter, the extending direction or longitudinal direction of the axis G is simply referred to as the axial direction.

In FIG. 1, the symbol G1 indicates the front end side in the axial direction, the symbol G2 indicates the proximal side in the axial direction and the rearward direction, the symbol L indicates the left direction, and the symbol R indicates the right direction. The left-right direction is perpendicular to the axial direction. In the following description, each part of the puncture needle 100 will be described with reference to the distal end side, the proximal end side, the right side, and the left side shown in FIG.

The main body 1 may be bilaterally symmetrical (plane symmetrical) on a virtual plane that overlaps with the axis G and is perpendicular to the left-right direction. Note that FIG. 1 illustrates the puncture needle 100 in a top view, but in the present embodiment, the top view means that the opening area of an opening H, which will be described later, is maximized in the direction orthogonal to the axis G. It means a viewpoint looking down on the main body 1 from the visible direction.

As shown in FIG. 1, the main body portion 1 has a blade surface portion 2 at the distal end portion of the main body portion 1 and an opening H formed by opening the hollow portion of the main body portion 1 in the blade surface portion 2 . The body portion 1 is inserted from the blade surface portion 2 into the human body or the like. The main body portion 1 allows the blade surface portion 2 to be guided to blood vessels, body cavities, internal organs, tumors, etc., to inject fluid into the human body through the opening H, and to take out the fluid to the outside of the body. It is In this embodiment, separate blade surfaces are formed on the left and right sides of the blade surface portion 2 in the main body 1, and the tip portion of the blade surface portion 2 is formed as a tip blade surface portion 21 formed in a triangular shape. A cut-type puncture needle 100 is illustrated and described.

As shown in FIGS. 1 and 2, the blade face portion 2 is provided with a blade face region 4 in which a blade face 40 intersecting with the axis G is formed. The blade surface 40 is a surface that slopes from the tip of the main body 1 toward the other end. The tip of the blade surface portion 2 has a sharp shape with the apex facing in the axial direction. 2 is a partial enlarged view of the blade surface 2 (reflection The part including the control area 5) is enlarged and displayed. The center Q overlaps with the axis G and is positioned on the interface between the inside and outside of the cylinder of the main body 1 .

As for the blade surface area 4, as shown in FIG. As shown in FIG. 2, in the side view of the main body 1, the blade surface 40 has an imaginary line L1 along the blade surface 40 that intersects the axis G at an acute angle.

As shown in FIG. 1, the blade surface region 4 is formed only with a reflection control region 5 and a blade surface 40, in which a reflecting structure that reflects ultrasonic waves in a direction different from that of the blade surface 40 is formed together with the blade surface 40. and a non-control region 6 where no reflective structure is formed. In this case, the reflection control area 5 is preferably arranged so as to be surrounded by the non-control area 6 . To surround means to arrange the non-control region 6 closer to the outer periphery of the blade face region 4 than the reflection control region 5 is.

The puncture needle 100 having such a blade surface region 4 has, for example, a blade surface portion 2 in which the tip of the main body portion 1 is obliquely cut to form the blade surface region 4 , that is, the blade surface 40 . It can be formed by forming a reflective structure in the region to be the control region 5 and leaving the other portion as the non-control region 6 .

As shown in FIG. 1 , the reflection control region 5 is a region in which a blade surface 40 and a reflecting structure for reflecting ultrasonic waves in a direction different from that of the blade surface 40 are formed together with the blade surface 40 . The reflection control region 5 has, as an example of a reflection structure, a reflection surface 50 facing in a direction different from that of the blade surface 40 .

The reflective surface 50 may be arranged so as to extend in a direction intersecting (perpendicular to) the axis G when viewed from above. The blade surface 40 and the reflecting surface 50 in the reflection control area 5 may be provided in parallel when viewed from above. FIGS. 1 and 2 show the case where the reflection control region 5 has a portion where the reflection surface 50 is formed and a portion where the blade surface 40 is arranged alternately in the axial direction. The width of the reflecting surface 50 along the axial direction is, for example, 50 to 300 micrometers, but this width can be set sequentially and changed as necessary.

As shown in the partial enlarged view of FIG. 2, the reflective surface 50 is arranged so that, in a side view, the portion where the reflective surface 50 is formed and the portion which is the blade surface 40 are alternately arranged in a stepped pattern. may be placed in FIG. 2 illustrates a case where the reflective surface 50 is recessed from the blade surface 40 to form a recess and form a part of the recess. By arranging the reflective surfaces 50 in this manner, the sharpness of the blade surface portion 2 can be maintained while the reflective surfaces 50 are arranged throughout the reflection control region 5 .

When the reflecting surface 50 is formed as a recess in this way, for example, the tip of the main body 1 is obliquely cut to form the blade surface region 4, that is, the blade surface 40, and the blade surface portion 2 is formed. A concave portion is formed in the region to be the region 5 by shaving, etching, laser processing, or the like to form the reflecting surface 50, and the remaining portion is left as the non-control region 6. FIG.

In addition, the maintenance of sharpness refers to ensuring a predetermined sharpness of the blade surface portion 2. For example, by forming a reflection structure, the sharpness of the blade surface portion 2 is not reduced, or the sharpness of the blade surface portion 2 formed with the reflection structure is maintained. means to improve.

As shown in FIG. 2, when the blade surface 2 is viewed from the inside of the opening H (see FIG. 1) in the right direction, the reflective surface 50 is such that a virtual line L2 along the reflective surface 50 is a virtual line L2 along the blade surface 40. It intersects the line L1 at an acute angle. That is, the reflecting surface 50 faces in a direction different from that of the blade surface 40 . A case where the intersection angle β between the virtual line L1 and the virtual line L2 is less than or equal to the intersection angle α between the virtual line L1 and the axis G will be described below. FIG. 2 shows the case where the virtual line L2 is parallel to the axis G (when the crossing angle β is equal to the crossing angle α).

Here, regarding the use of the puncture needle 100, how to grasp the position of the puncture needle 100 in the body will be described. When using the puncture needle 100, it is important to grasp the position of the tip portion of the puncture needle (blade surface portion 2 in this embodiment) when catching blood vessels and tumor cells. As shown in FIG. 3, grasping or detecting the position of the blade surface portion 2 in the body (including detecting when simply grasping the position in the following description) is performed by, for example, an ultrasonic probe (hereinafter simply referred to as probe P It is performed by imaging diagnosis using an echo device with In FIG. 3, for convenience of explanation, the puncture needle 100 is deformed in relation to the display size of the probe P and displayed in a larger size than the actual size ratio. Although the explanation is omitted in the drawings after FIG. 3, the puncture needle 100 or a part thereof is deformed and enlarged and displayed in the same manner as in FIG.

As shown in FIG. 3, the puncture needle 100 is punctured through the skin S into the body (under the skin S), the sensor surface Ps of the probe P is brought into contact with the skin S, and the tip of the puncture needle 100 is An ultrasonic wave W is radiated aiming at . In FIG. 3, the probe P is obliquely pressed against the body surface (for example, the probe P is pressed so that the sensor surface Ps or the skin S of the portion pressed against the sensor surface Ps is along the axial direction of the main body 1 ) is shown as an example. The position of the puncture needle 100 inside the body is detected by the reflected waves R1 and R2 and displayed on the display section of the echo device or the like. Here, the reflected wave R1 is a reflected wave of the ultrasonic wave W from the body portion 1 other than the blade surface portion 2. As shown in FIG. A reflected wave R2 is a reflected wave from the blade surface portion 2 . In addition, in this embodiment, the frequency of the ultrasonic wave W includes the case where it is at least 3 MHz to 14 MHz.

As shown in FIG. 3, since the probe P is pressed against the skin S so that the sensor surface Ps is along the axial direction of the main body 1, the probe P receives the specular reflection component of the ultrasonic wave W from the main body 1. A reflected wave R1 including is received with high intensity. Therefore, the echo device can draw the main body 1 sharply based on the reflected wave R1, and the user of the puncture needle 100 (for example, a doctor) can grasp the position of the main body 1 well. Further, the echo device draws the blade surface portion 2 based on the reflected wave R2 received by the probe P.

The reflection of the ultrasonic wave W on the blade surface portion 2 will be further described in detail with reference to FIG. 4 is a part of the blade surface 2 (a portion including the reflection control region 5) viewed from the side (right direction as an example) from the inside of the opening H (for example, the position of the center Q of the opening H) in FIG. ) is an enlarged view (partially enlarged view). In FIG. 4, among the reflected waves R2, the ultrasonic waves reflected from the blade surface 40 are shown as the reflected waves R21 and the reflected waves R22 reflected from the reflecting surface 50 as the reflecting structure.

An imaginary line L1 along the blade surface 40 intersects the axis G at an acute angle (see FIG. 2), and the blade surface 40 does not follow the sensor surface Ps of the probe P. Most of the specularly reflected components of the sound wave W are not directed toward the sensor surface Ps, and the probe P cannot receive the reflected wave R21 with a very high intensity.

However, the imaginary line L2 along the reflection surface 50 is parallel to the axis G (see FIG. 2), and the sensor surface Ps of the probe P is along the reflection surface 50 (opposed in parallel). As a result, the specular reflection component of the ultrasonic wave W on the reflecting surface 50 is directed toward the sensor surface Ps, and the probe P can receive the reflected wave R22 with a stronger intensity than the reflected wave R21. Therefore, the echo device can sharply draw the blade surface 2 based on the reflected wave R22, and the user (for example, doctor) of the puncture needle 100 can grasp the position of the blade surface 2 well. That is, the reflective structure can improve the visibility of the tip portion of the puncture needle 100 . Since the reflecting surface 50 is arranged over the entire reflection control area 5 as described above, the probe P can receive the reflected wave R22 from the entire reflection control area 5 with a higher intensity. As a result, the echo device can sharply draw the entire reflection control region 5 on the blade surface 2 based on the reflected wave R22, and the visibility of the tip portion of the puncture needle 100 can be improved.

As shown in FIG. 1, the non-control region 6 is a region of the blade face region 4 where no reflective structure is formed. The non-control region 6 is arranged in the outer peripheral portion of the blade face region 4 and includes the peripheral region of the blade face portion 2 . The non-controlled region 6 is arranged outside the reflection controlled region 5 on the blade face portion 2 . In this embodiment, the non-control region 6 is arranged so as to surround the entire outer peripheral edge of the reflection control region 5 . In other words, the reflection control area 5 is entirely surrounded by the non-control area 6, and the entire reflection control area 5 is arranged inside the non-control area 6 in the blade surface area 4. .

Since the non-control region 6 is not provided with a reflection structure, by arranging the non-control region 6 on the outer peripheral portion of the blade surface region 4 (outside the reflection control region 5), the reflection structure is formed on the outer periphery of the blade surface region 4. The sharpness of the blade surface portion 2 can be maintained by avoiding arranging it on the part. That is, it is possible to avoid an increase in resistance when puncturing the puncture needle 100 .

[Second embodiment]
In the second embodiment, as shown in FIG. 5, the intersection angle β between the virtual line L1 and the virtual line L2 exceeds the intersection angle α between the virtual line L1 and the axis G. Unlike the form, the others are the same. In the following, regarding the use of the puncture needle 100 of this embodiment, differences from the first embodiment will be described.

As shown in FIG. 6, the puncture needle 100 is pierced through the skin S into the body (below the skin S), the sensor surface Ps of the probe P is brought into contact with the skin S, and the tip of the puncture needle 100 is targeted to generate ultrasonic waves W. to irradiate. FIG. 6 illustrates a case where the probe P is applied along the body surface (sensor surface Ps is aligned with the skin S). In this example, the probe P is applied so that the sensor surface Ps or the part of the skin S to which the sensor surface Ps is applied intersects the axial direction of the main body 1 .

As shown in FIG. 6, since the probe P is applied so that the sensor surface Ps intersects the axial direction of the main body 1, the regular reflection component of the ultrasonic wave W from the main body 1 is directed toward the sensor surface Ps. reflect in a direction away from Therefore, compared with the case of the first embodiment, the probe P may not be able to receive the reflected wave R1 with sufficient intensity.

The reflection of the ultrasonic waves W on the blade surface portion 2 will be further described in detail with reference to FIG. 7 shows a portion of the blade surface 2 (a portion including the reflection control region 5) viewed from the side (right direction as an example) from the inside of the opening H (for example, the position of the center Q of the opening H) in FIG. ) is enlarged and displayed.

An imaginary line L1 along the blade surface 40 intersects the axis G at an acute angle (see FIG. 1), and since the blade surface 40 is largely warped with respect to the sensor surface Ps, the reflected wave R21 (especially the blade surface 40 (most of the specular reflection component of the ultrasonic wave W at ) does not go toward the sensor surface Ps, and the probe P can hardly receive the reflected wave R21.

Since the intersection angle β between the virtual line L1 and the virtual line L2 exceeds the magnitude of the intersection angle α between the virtual line L1 and the axis G (see FIG. 5), the reflecting surface 50 is along (parallel to) the sensor surface Ps. or nearly parallel). As a result, most of the specularly reflected component of the ultrasonic wave W on the reflecting surface 50 is directed toward the sensor surface Ps, so that the probe P can receive the reflected wave R22 with a higher intensity than the reflected wave R21. Therefore, the echo device can sharply draw the blade surface 2 based on the reflected wave R22, and the user (for example, doctor) of the puncture needle 100 can grasp the position of the blade surface 2 well. That is, the reflective structure can improve the visibility of the tip portion of the puncture needle 100 .

[Third Embodiment]
In the third embodiment, as shown in FIG. 8, the puncture needle 100 is a back-cut type in which the distal end portion of the blade surface portion 2 described in the first embodiment is a tip blade surface portion 21 formed in a triangular shape. Instead of the case, the blade surface region 4 has a first blade surface region 4a in which the first blade surface 41 is formed as the blade surface 40, and a second blade surface region 42 in which the second blade surface 42 is formed as the blade surface 40. 4b and a third blade surface region 4c in which a third blade surface 43 is formed as the blade surface 40, the first blade surface 41, the second blade surface 42 and the third blade surface 43 facing in different directions. It differs from the first embodiment in that it is the type, but the rest is the same. The main body 1 may be bilaterally symmetrical (plane symmetrical) in a plane that overlaps the axis G and is perpendicular to the left-right direction. In the following, a case where the main body 1 is bilaterally symmetrical will be described as an example.

The first blade surface region 4 a is arranged in a proximal region of the blade surface region 4 . The second blade surface region 4b is arranged in a region on the tip side and right side of the first blade surface region 4a in the blade surface region 4. As shown in FIG. The third blade surface region 4c is arranged in a region of the blade surface region 4 on the tip side of the first blade surface region 4a and on the left side of the second blade surface region 4b.

FIG. 9 is a cross section taken along the line A--A shown in FIG. As shown in FIG. 9, in this embodiment, the second blade surface 42 is a surface inclined rightward. Similarly, the third blade surface 43 is a surface inclined leftward.

Also in the second blade face region 4b and the third blade face region 4c of the blade face region 4, the non-control region 6 is arranged in the outer peripheral portion of the blade face region 4 as in the first embodiment. Thereby, the sharpness of the blade surface portion 2 is maintained.

In the second blade surface region 4b, the second blade surface 42 (blade surface 42a) in the reflection control region 5 and the reflecting surface 50 are provided non-parallel. That is, the blade surface 42a and the reflecting surface 50 are provided in a crossing direction when viewed from the front (axial view).

In the third blade surface region 4c, the third blade surface 43 (blade surface 43a) in the reflection control region 5 and the reflecting surface 50 are provided non-parallel. That is, when viewed from the front, the blade surface 43a and the reflecting surface 50 are provided in a crossing direction.

The reflective surfaces 50 of the second blade surface region 4b and the third blade surface region 4c are provided parallel to the reflective surface 50 of the first blade surface region 4a when viewed from the front. As a result, most of the regular reflection component of the ultrasonic wave W can be received as the reflected wave R22 with high intensity.

FIG. 10 shows a portion of the blade surface 2 (a portion including the reflection control region 5) viewed from the inside of the opening H (for example, the position of the center Q of the opening H) in a side view (rightward view as an example). ) is enlarged and displayed. As shown in FIG. 10, when the blade surface portion 2 is viewed from the inside of the opening H (see FIG. 1) in the right direction, a virtual line L12 along the second blade surface 42 (another example of the virtual line L1) is It is inclined in a direction in which the angle of intersection with the axis G increases with respect to the virtual line L11 (another example of the virtual line L1) along the first blade surface 41 . Since the body portion 1 is symmetrical as described above, the relationship between the third blade surface 43 and the first blade surface 41 is the same, although illustration is omitted. As in the description of the first embodiment, when the blade surface 2 is viewed from the inside of the opening H, the virtual line L2 along the reflecting surface 50 is the same as the virtual line L11 and the virtual line L12. intersect at an acute angle. As a result, the echo device can sharply draw the blade surface 2 based on the reflected wave R22 reflected from the reflection surface 50 as the reflection structure, and can grasp the position of the blade surface 2 well.

[Modification of above embodiment]
Below, the modification of the said embodiment is demonstrated.

[Modification 1]
In the above-described embodiment, as an example of the reflective structure, the case of having the reflective surface 50 facing in a direction different from that of the blade surface 40 has been described. Then, the reflecting surface 50 may be arranged so as to extend in a direction intersecting with the axis G when viewed from above, and the reflecting surface 50 includes a portion where the reflecting surface 50 is formed and a blade surface when viewed from the side. It has been explained that the portions 40 may be alternately arranged in a stepped manner. However, the reflective surface 50 and the portion forming the blade surface 40 are not limited to being arranged stepwise.

FIG. 11 shows a perspective view of a modification of the reflection control region 5. As shown in FIG. As shown in FIG. 11, when forming a reflective surface 50 facing in a different direction from the blade surface 40 as a reflective structure, for example, a groove C in which a concave portion is formed in a groove shape is formed as a reflective structure, and the bottom surface of the groove C is a reflective surface. 50 may be used. The groove C may be arranged so as to extend in a direction intersecting with the axis G (see FIG. 1).

[Modification 2]
In the above-described embodiment, as an example of the reflective structure, the case of having the reflective surface 50 facing in a direction different from that of the blade surface 40 has been described. The reflecting surface 50 is not limited to being planar, and may be formed as a rough surface 50R as shown in FIG. In other words, rough surface-like minute unevenness may be employed as the reflective structure. In the description of fine unevenness, fine unevenness means, for example, a case where the difference in height between peaks and valleys of adjacent unevenness is about several micrometers to 20 micrometers. By forming the reflecting surface 50 as the rough surface 50R, the regular reflection component of the reflected wave R22 (see FIG. 4, etc.) is not reflected only in a specific direction, but is reflected in an unspecified direction. As a result, even when the positional relationship between the probe P (see FIGS. 3 and 6) and the blade surface portion 2 changes, the probe P can receive the reflected wave R22 with necessary and sufficient intensity. As a result, the echo device can draw the blade face portion 2 with necessary and sufficient accuracy based on the reflected wave R22.

[Modification 3]
In the above-described embodiment, as an example of the reflective structure, the case of having the reflective surface 50 facing in a direction different from that of the blade surface 40 has been described. The reflective surface 50 is not limited to being formed of only surfaces facing the same direction, and may be formed of two or more surfaces facing different directions.

FIG. 13 shows a portion of the blade surface portion 2 (reflection control region 5) viewed from the side (right direction as an example) from inside the opening H when the reflecting surface 50 is formed of two surfaces facing in different directions. is an enlarged view of the part including As shown in FIG. 13 , the reflecting surface 50 may include a first reflecting surface 51 and a second reflecting surface 52 facing in a direction different from that of the first reflecting surface 51 . FIG. 13 shows the blade surface portion 2 as viewed from the side, and shows the case where the blade surface 40 is arranged between the first reflecting surface 51 and the second reflecting surface 52. .

By forming the reflecting surface 50 with two or more surfaces facing different directions, the specular reflection component of the reflected wave R22 is not reflected only in a specific direction, but is reflected in two or more directions. As a result, even when the positional relationship between the probe P (see FIGS. 3 and 6) and the blade surface portion 2 changes, the probe P can receive the reflected wave R22 with necessary and sufficient intensity. As a result, the echo device can draw the blade face portion 2 with necessary and sufficient accuracy based on the reflected wave R22.

[Modification 4]
In the above-described embodiment, a case where the reflecting surface 50 is formed by two or more surfaces facing different directions as in Modification 3 will be described. The case of including two surfaces 51 and the second reflecting surface 52 facing in a different direction has been described. The reflective surface 50 may be formed including multiple surfaces facing different directions, as shown in FIG.

FIG. 14 exemplifies a case where the reflecting surface 50 is formed by a collection of surfaces of three-dimensional polyhedrons 50a to 50e. In other words, it shows the case where the reflection structure is formed of a polyhedron (solid) or an assembly thereof. FIG. 14 exemplifies the case where the polyhedrons 50a to 50e are triangular pyramid-shaped projections, but the polyhedrons 50a to 50e may be quadrangular pyramids or pyramids with more angles. good.

By adopting a polyhedron or an assembly thereof as the reflection structure, the regular reflection component of the reflected wave R22 is reflected not only in a specific direction but in a plurality of directions. As a result, even when the probe P or the puncture needle 100 is moved, the reflected wave R22 includes specular reflection components reflected by any surface of the polyhedron. That is, even when the positional relationship between the probe P (see FIGS. 3 and 6) and the blade surface portion 2 changes, the probe P can receive the reflected wave R22 with necessary and sufficient intensity. As a result, the echo device can draw the blade face portion 2 with necessary and sufficient accuracy based on the reflected wave R22.

[Modification 5]
In the above embodiments, the reflective structure may be coated with a coating material such as resin. FIG. 15 shows a view (partially enlarged cross-sectional view) in which a part of the cross section of the blade face portion 2 facing in the left-right direction (the portion including the reflection control region 5) is enlarged. As an example, as shown in FIG. 15, a film F may be provided on the blade surface portion 2 so that the entire surface of the blade surface region 4 is covered with the film F. Also, part of the blade surface region 4, for example, only the reflection control region 5 or only the reflection structure may be covered with the film F. The thickness of the coating F is, for example, 10 micrometers to 200 micrometers.

By covering at least a part of the blade face region 4 with the film F, the reflective structure can be covered and the sharpness of the blade face portion 2 can be maintained. For example, when the rough surface 50R is formed as a reflective structure, the unevenness of the surface of the rough surface 50R can be covered with the film F to maintain sharpness.

When the film F is formed so as to cover the reflective structure, the film F may adhere to the surface of the reflective structure (eg, the reflective surface 50 or the rough surface 50R). By bringing the coating F into close contact with the surface of the reflecting structure, the coating F can be firmly fixed to the blade surface portion 2 . In particular, when the film F is brought into close contact with the surface of the rough surface 50R, the film F can be entwined with the fine irregularities and fixed firmly. In order to bring the film F into close contact with the surface of the reflective structure, the film F may be entwined and firmly fixed so as to be three-dimensionally locked in the concave portion of the reflective structure.

Even when the film F is adhered to the surface of the reflecting structure, the reflection of the ultrasonic wave W (see FIG. 3 and the like) from the metal surface of the blade surface 2 is dominant in the reflected wave R2. This is because the acoustic impedance of the body and the acoustic impedance of the resin forming the film F are usually similar, so that the reflection of the ultrasonic waves W on the surface of the film F becomes small, and most of the ultrasonic waves W pass through the film F. This is because the light reaches the surface of the blade surface portion 2 and is reflected. The difference between the acoustic impedance of the resin forming the film F and the acoustic impedance of the metal blade surface 2 (body portion 1) is greater than the difference between the acoustic impedance in the body and the acoustic impedance of the resin forming the film F. There is a difference.

[Modification 6]
In the above embodiment, when the reflective structure is covered with the film F as in Modification 5, an air layer A may be formed between the film F and the surface of the reflective structure. In other words, the coating F and all or part of the surface of the reflective structure may be separated.

FIG. 16 shows an enlarged view (partially enlarged cross-sectional view) of a portion including the air layer A, which is a part of the lateral cross section of the blade surface portion 2 . In FIG. 16, the film F is fixed to the top of the minute protrusions T of the rough surface 50R, the film F is separated from the bottom surface of the minute recesses V of the rough surface 50R, and air is present between the rough surface R and the film F. A case where a layer A (space) is formed is shown. Even when the air layer A is formed between the rough surface R and the coating F in this manner, the unevenness of the surface of the rough surface 50R can be covered with the coating F to maintain sharpness. The difference in upside-down between the top of the minute protrusion T and the bottom of the minute recess V is several micrometers to 20 micrometers. That is, the thickness of the air layer A is several micrometers to 20 micrometers.

When the air layer A is formed between the rough surface R and the film F, the reflected wave R2 is the reflection of the ultrasonic wave W (see FIG. 3 and the like) from the rough surface 50R and the metal surface of the blade surface portion 2. becomes dominant. This is because the difference between the acoustic impedance of the film F and the acoustic impedance of the air layer A formed between the rough surface R and the film F is large. This is because most of it is reflected. As a result, the probe P (see FIGS. 3 and 6) can receive the reflected wave R22 with higher intensity, so that the echo device can sharply draw the blade surface 2 based on the reflected wave R22.

As described above, it is possible to provide a puncture needle with improved visibility of the tip portion.

[Another embodiment]
(1) In the above embodiment, the case where the puncture needle 100 is the back cut type and the case where the puncture needle 100 is the lancet type have been described, but these are merely examples. As long as the blade surface region 4 includes the reflection control region 5 formed with the reflection structure, the shape of the main body portion 1 and the shape of the blade surface portion 2 do not matter. For example, the puncture needle 100 may be of a Hoover type in which the tip of the body portion 1 is bent toward the blade surface region 4 of the blade surface portion 2, or an opening is provided on the back side of the blade surface region 4 of the blade surface portion 2 A back eye type in which an opening separate from the portion H is formed may be used.

(2) In the above embodiment, the case where the non-control region 6 is arranged so as to surround the entire outer peripheral edge of the reflection control region 5 has been described. However, the non-control region 6 does not necessarily have to be arranged, and even if it is arranged, it does not have to surround the entire outer peripheral edge of the reflection control region 5 . For example, it may be arranged only on the tip side of the reflection control region 5 in the blade face region 4 so as to surround only the tip side portion of the outer peripheral edge of the reflection control region 5 . Even in this way, the cutting edge of the blade surface portion 2 can be maintained sharp.

It should be noted that the configurations disclosed in the above embodiments (including other embodiments, the same shall apply hereinafter) can be applied in combination with configurations disclosed in other embodiments as long as there is no contradiction. The embodiments disclosed in this specification are exemplifications, and the embodiments of the present invention are not limited thereto, and can be modified as appropriate without departing from the object of the present invention.

The present invention can be applied to puncture needles.

Reference Signs List 1: main body portion 2: blade face portion 4: blade face region 4a: first blade face region 4b: second blade face region 4c: third blade face region 5: reflection control region 6: non-control region 21: tip blade face portion 40 : Blade surface 41 : First blade surface 42 : Second blade surface 42a : Blade surface 43 : Third blade surface 43a : Blade surface 50 : Reflecting surface 50R : Rough surfaces 50a to 50e: Polyhedron 51 : First reflecting surface 52 : Second reflecting surface 100 : Puncture needle C : Groove F : Coating G : Axis H : Opening L1 : Virtual line L11 : Virtual line L12 : Virtual line L2 : Virtual line P : Probe Ps : Sensor surface Q : Center R : Rough surface R1 : Reflected wave R2 : Reflected wave R21 : Reflected wave R22 : Reflected wave A : Air layer S : Skin T : Minute protrusions V : Minute recesses W : Ultrasonic waves α : Crossing angle β : Crossing angle

Claims (11)

a rod-shaped main body;
and a blade surface portion formed at the tip portion of the main body portion,
The blade surface portion has a blade surface region in which a blade surface that intersects the axis of the main body portion is formed,
The puncture needle, wherein the blade surface region includes a reflection control region formed with a reflection structure that reflects ultrasonic waves in a direction different from that of the blade surface. The puncture needle according to claim 1, wherein the reflecting structure has a reflecting surface facing in a direction different from that of the blade surface. The puncture needle according to claim 2, wherein the reflecting surface is a surface parallel to the axis of the main body. The puncture needle according to claim 2 or 3, wherein the reflecting structure is a recess having the reflecting surface. The puncture needle according to claim 4, wherein the recess is a groove extending in a direction intersecting the axis of the main body. The puncture needle according to any one of claims 2 to 5, wherein the reflective surface includes a first reflective surface and a second reflective surface facing in a different direction from the first reflective surface. The puncture needle according to any one of claims 2 to 6, wherein the reflective surface is formed as a rough surface. The puncture needle according to any one of claims 2 to 7, wherein the blade surface further has a resin film covering the reflection control region. The puncture needle according to claim 8, wherein the blade surface portion has an air layer between the coating and the reflecting surface. The puncture needle according to claim 8, wherein the coating is in close contact with the reflecting surface. The blade surface region includes a non-control region where the reflective structure is not formed,
The puncture needle according to any one of claims 1 to 10, wherein the reflex control area is surrounded by the non-control area.

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