JP6307917B2 - Breakage resistant engagement structure and needle base breakage resistant cover - Google Patents

Description

  The present invention relates to a breakage-resistant engagement structure and a needle-base breakage-resistant cover for suppressing breakage of a needle base when an injection needle is screwed into a syringe, and in particular, the engagement force between the needle base and the cover is asymmetric. The present invention relates to a breakage-resistant engagement structure and a needle-base breakage-resistant cover.

  Conventionally, in a replaceable syringe, the injection needle is inserted into a cover, and the needle base of the injection needle is screwed into the tip of the syringe through the cover. Also, when removing the injection needle, the cover was inserted into the needle base and rotated in the opposite direction.

  The integrity of the injection needle and the cover, particularly the integrity in the rotational direction, has been secured by providing ribs extending in the axial direction on the needle base outer periphery and the cover inner periphery, which interfere with each other.

  In addition, the fitting of such a syringe is defined in ISO594-2, in which a needle base is provided with a flange. At the time of attachment, this flange is fitted and screwed into the screwing groove, and a good fitting between the syringe and the injection needle is formed.

However, the conventional technique has the following problems.
Conventionally, when the injection needle is attached, there is a possibility that the needle base may be damaged, for example, the force is excessively applied and the flange is licked.

Japanese Patent Laid-Open No. 2005-199059 Japanese Utility Model Publication No. 55-109532 JP 2012-205636 A JP 2010-184112 A

  This invention is made | formed in view of the above, Comprising: It aims at providing the structure and cover which improve the attachment reliability to the syringe of an injection needle.

The breakage-resistant engagement structure between the injection needle and the cover according to claim 1 includes an injection needle that is screwed into a syringe by a flange at a needle base end portion, and a cylindrical injection that is inserted into the needle base and integrated with the injection needle. An engagement structure with a needle cover, which is a protrusion that extends in the axial direction on the outer periphery of the needle base and the inner periphery of the cover, and is arranged in the same number or a multiple of one or a multiple of one of the numbers. Protrusions that interfere with each other by rotation are provided, and a slope that rises from the front in the rotational direction when rotating the cover clockwise toward the insertion port and reaches the protrusion of the cover is formed on the inner periphery of the cover, and / or When the needle base is rotated clockwise toward the needle, a slope that rises from the front in the rotation direction and reaches the ridge of the needle base is formed on the outer periphery of the needle base, and the cover is inserted into the injection needle to a predetermined depth so that the cover and the needle base are The needle base is integrated by bringing it into surface contact When screwed into, in the above predetermined torque causing idling by overcoming the slope of the ridge, suppressing damage to the flange or hub, a resistance to breakage engagement structure of the needle and cover.

  That is, in the invention according to claim 1, the engagement force and the impact force between the needle base and the cover for the rotation in the tightening direction (right rotation) are made smaller than the rotation in the loosening direction (left rotation). The mounting reliability of the needle to the syringe is improved.

  The slope may be flat or curved. Further, the slope may be formed up to the height of the upper surface of the ridge, or may be connected or joined to the side surface of the ridge up to a lower height. Since the slope is provided in front of the protrusion in the circumferential direction, this portion can also be expressed as a substantially wedge-shaped engaging body or a substantially wedge-shaped engaging body.

  The axial direction here is not limited to being in the same direction as the central axis of the cover or the extending direction of the needle, that is, being parallel, and there is also a meaning that there is no positional relationship between the axis and the twist (on the same plane). Shall be included. This is because the needle base outer periphery or the cover inner periphery is slightly tapered, and the protrusions may be provided along the outer periphery or the inner periphery.

  Further, the same number of ridges arranged in rotation symmetry or a multiple of one number or a number of divisors are as follows: (1) When the number of ridges on the cover and the ridges on the needle base is the same, (2) For example, when there are three ridges on the cover and the number of ridges on the needle base is a multiple of 3, ie, 6, 9,... (3) For example, When there are six strips on the basis of the strip, it means a case where the number of projections on the needle base is a divisor of 6, ie, three or two. Here, it is assumed that the divisor does not include itself and 1. With this relationship, the ridges are simultaneously engaged with each other in rotational symmetry.

The damage-resistant engagement structure between the injection needle and the cover according to claim 2 includes an injection needle that is screwed into a syringe by a flange at a needle base end, and a cylindrical injection that is inserted into the needle base and integrated with the injection needle. An engagement structure with a needle cover,
On the needle base outer periphery and the cover inner periphery, there are provided ridges that extend in the axial direction and are symmetrically arranged in the same number or multiples of one number or about several minutes and interfere with each other by rotation,
Rotation direction when the cover is rotated clockwise toward the insertion port The upper surface of the ridge of the cover is formed as a slope whose front side is lower than the rear side, and / or rotation direction when the needle base is rotated clockwise toward the needle Forming the upper surface of the ridge of the needle base as a slope whose front side is lower than the rear side ,
When the cover is inserted into the injection needle to a predetermined depth, the cover and the needle base are brought into surface contact and integrated, and the needle base is screwed into the syringe, the idle rotation occurs over the slope of the ridge above a predetermined torque. , flange or inhibit damage to the needle hub, a resistance to breakage engagement structure of the needle and cover.

  That is, in the invention according to claim 2, the engagement force and the impact force between the needle base and the cover with respect to the rotation in the tightening direction (right rotation) are made smaller than the rotation in the loosening direction (left rotation). The mounting reliability of the needle to the syringe is improved.

  The slope may be flat or curved. Moreover, the aspect by which all the front side surfaces of a protrusion are cut off and a slope is directly formed from the needle | hook base outer periphery or the cover inner periphery (a cross section becomes a right triangle) may be sufficient. Furthermore, the side surface of the ridge does not need to face the radial direction from the center of the shaft. In other words, the ridge may be provided as an engaging body or a locking body lying on the rear side with respect to the crimping direction.

  The breakage-resistant engagement structure according to claim 3 is the breakage-resistant engagement structure according to claim 1 or 2, wherein the protrusions of the needle base have a stepped height in the needle direction. It is characterized by having a shape that continuously decreases in height toward the shape or the needle direction.

  That is, in the invention according to claim 3, when the integrity of the cover and the injection needle is poor, the cover rotates with respect to the injection needle (beyond the ridge) with a weak force, and the clamping force that is sensuously good for the user. Can be obtained.

  In the case of a staircase, it is sufficient to have a two-step structure of a high step and a low step. At this time, the length of the high step is preferably the length in the axial direction of the ridge or slope of the cover. Continuously lower means that the ridge of the needle base has an angle at which interference with the ridge of the cover is eliminated. In addition, the linear part (step flat part) in the case of staircase shape does not need to be parallel to the axis, and may have the same inclination when the needle base is tapered.

The needle base breakage-resistant cover according to claim 4 has a multi-stage cylindrical base that is reduced in diameter toward the tip of the needle, and a needle base protrusion that extends in the axial direction and is arranged rotationally symmetrically on the outer periphery of the small diameter cylinder. A cylindrical injection needle that is used for injection needles having needle bases each formed with a flange that is screwed into a syringe at the base end, and is inserted into the needle base and brought into surface contact with the needle base to be integrated with the injection needle A cover cover that extends in the axial direction and is symmetrical with respect to the needle base protrusion, or a multiple or a multiple of that number, and is inserted into the cover protrusion that interferes with the needle base protrusion by rotation. When the cover is rotated clockwise toward the mouth, a slope that rises from the front in the rotational direction and reaches the cover ridge is formed on the inner periphery, and the injection needle is screwed into the syringe through the cover and attached. raw idling needle based on projections by more torque to overcome the cover ridge Is allowed to suppress the breakage of the flange or hub, when removing is characterized by maintaining the engagement between the needle base protrusion and the cover protrusion.

  That is, in the invention according to claim 4, the engagement force and the impact force between the needle base and the cover with respect to the rotation in the tightening direction (right rotation) are made smaller than the rotation in the loosening direction (left rotation). The mounting reliability of the needle to the syringe is improved.

  Small diameter means small compared to the largest diameter. The multiples and divisors are as described above.

The needle base breakage-resistant cover according to claim 5 is a multi-stage cylinder base tone that is reduced in diameter toward the tip of the needle, and a needle base protrusion that extends in the axial direction and is arranged rotationally symmetrically on the outer periphery of the small diameter cylinder. A cylindrical injection needle that is used for injection needles having needle bases each formed with a flange that is screwed into a syringe at the base end, and is inserted into the needle base and brought into surface contact with the needle base to be integrated with the injection needle A cover cover that extends in the axial direction and is rotationally symmetrical and arranged in the same number as the needle base protrusion, or a multiple or a fraction of that number, and the cover protrusion that interferes with the needle base protrusion by rotation When the upper surface of the cover protrusion is formed as a slope whose front side in the rotation direction is lower than the rear side when the cover is rotated clockwise toward the insertion port, and the injection needle is screwed onto the syringe through the cover and attached. needle hub ridge above a predetermined torque to the rides over the cover protrusion Causing around to suppress damage to the flange or hub, when removing is characterized by maintaining the engagement between the needle base protrusion and the cover protrusion.

  That is, in the invention according to claim 5, the engagement force and the impact force between the needle base and the cover with respect to the rotation in the tightening direction (right rotation) are made smaller than the rotation in the loosening direction (left rotation). The mounting reliability of the needle to the syringe is improved.

  ADVANTAGE OF THE INVENTION According to this invention, the structure and cover which improve the attachment reliability to the syringe of an injection needle can be provided (Claims 1, 2, 4, and 5). In addition, it is possible to provide a breakage-resistant engagement structure that allows the user to acquire a sensuously good tightening force (claim 3).

It is sectional drawing which showed the syringe tip, the injection needle which forms the damage-resistant engagement structure of this invention, and a cover. An insertion port portion (a), a partially enlarged view (b), and a needle base (c) of the needle base damage-resistant cover of the present invention forming the damage-resistant engagement structure shown in FIG. 1 are shown. FIG. FIG. 1 is a cross-sectional view of the AA portion when the cover is attached to the injection needle in FIG. 1, a perspective view showing the state of engagement during tightening, an enlarged view thereof (b), and a relationship during loosening. It is the perspective view (c) which showed the mode of joining. It is AA sectional drawing which showed notionally various aspects of engagement of the damage-resistant engagement structure or damage-resistant cover of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Here, a configuration in which the cover is provided with the resistance to breakage of the needle base of the injection needle will be mainly described. FIG. 1 is a cross-sectional view showing a syringe tip, an injection needle and a cover that form the breakage-resistant engagement structure of the present invention. FIG. 2 is a perspective explanatory view of an insertion port portion and a needle base of the needle base damage-resistant cover of the present invention that forms the damage-resistant engagement structure shown in FIG. FIG. 3 is a cross-sectional view of the AA portion when the cover is attached to the injection needle in FIG. 1 and is a perspective view showing the state of engagement during tightening and loosening. In each figure, for convenience of explanation, each component is drawn with a different scale.

  The breakage-resistant engagement structure 1 is formed by the cover 100 and the injection needle 200. The injection needle 200 is integrated in a state of being substantially accommodated in the cover 100, and is screwed onto the tip of the syringe 300. Also, when removing the cover 100, the cover 100 is inserted into the injection needle 200 and integrated, and then turned counterclockwise. This increases cleanliness and work safety.

  The injection needle 200 and syringe 300 have a shape according to ISO 594-2 (6% (Luer) tapered cone fitting for syringes, injection needles and other medical devices-Part 2: fixed fitting) and has a screw shape. Match. That is, as described below, the distal end of the syringe 300 has a male structure and a predetermined screwing groove is formed. The needle base of the injection needle 200 has a female structure that fits into the male structure and a proximal end. A flange that is screwed into the screwing groove is formed on the outside. The injection needle 200 is attached in close contact with the syringe 300 simply and completely by fitting and screwing.

First, the syringe 300 will be described.
As described above, the syringe 300 is provided with the convex fitting portion 301 defined by ISO594-2 at the tip (needle side). The convex fitting portion 301 has a coaxial double tube structure and includes an inner cylinder 310 and an outer cylinder 320. A liquid conduction path 311 is formed at the center of the inner cylinder 310, and the outer peripheral surface 312 of the inner cylinder is fitted with the needle base 201 with a gentle taper of 6/100.

  The inner wall of the outer cylinder 320 is provided with a screwing groove 321 that is a female screw. The flange 211 is screwed into the screwing groove 321.

Next, the injection needle 200 will be described.
The injection needle 200 includes a needle base 201 that fits and is screwed to the convex fitting portion 301, and a needle 202. The needle base 201 has a three-stage coaxial cylindrical shape whose diameter decreases toward the needle 202 side. Here, the first cylinder 210, the second cylinder 220, and the third cylinder 230 are referred to from the base end (the side to be inserted into the convex fitting portion 301).

  The first cylinder 210 follows the shape specified in ISO594-2. That is, the first cylinder 210 has two flanges 211 at the base end, and the flanges 211 are rotated clockwise toward the convex fitting portion 301 to enter the screwing grooves 321 and screwed together. Further, the inner peripheral surface 212 of the first cylinder 210 is gently tapered by 6/100 and is fitted to the convex fitting portion 301. Moreover, the same taper is also given to the outer peripheral surface 213 of the 1st cylinder 210, and the cover 100 fits well.

The step 221 formed between the second cylinder 220 and the first cylinder 210 is used to prevent the vertical rib 110 of the cover 100 from abutting and preventing excessive entry.
The third cylinder 230 inserts the needle 202 into the central hole 231 and adhesively holds it.

  The needle base 201 also includes a needle base rib 240 extending from the second cylinder 220 to the third cylinder 230 in the axial direction (on the needle 202 side). Four needle base ribs 240 are provided on the side periphery of the needle base 201 with 90 ° rotational symmetry.

The needle base rib 240 is higher than the outer periphery of the second cylinder 220 and has a height equal to or lower than the needle-side end surface (the portion where the step 221 is formed) of the first cylinder 210 and extends in parallel with the axis. and 241 has a step structure in which the second stage 242 is connected in parallel to extend in the first stage 241 slightly lower becomes shaft than (multi rib structure) (it is assumed for convenience l ₁ the length of the first stage 241 ). The needle base rib 240, particularly the first step 241 interferes with the vertical rib 110 of the cover 100 in the rotational direction as will be described later.

Next, the cover 100 will be described.
The cover 100 is a bottomed cylinder having a length for accommodating the needle 202, and the needle 202 is inserted from the opened insertion port 101, and the needle base 201 is inserted and integrated with the injection needle 200. In detail, the inner peripheral surface 102 of the cover 100 has the same taper as the outer peripheral surface 213 of the first cylinder 210 of the needle base 201, and the cover 100 and the needle when the first cylinder 210 is inserted to a predetermined depth. and group 201 is to be fitted (surface contact) (for convenience and l ₂ of the insertion depth from the outlet 101).

Moreover, the cover 100 is provided with the longitudinal rib 110 extended in the inner peripheral surface 102 toward the back of a cylinder. As with the needle base rib 240, four vertical ribs 110 are provided with 90 ° rotational symmetry. Rising position of the longitudinal ribs 110 is the distance from the outlet 101 of the _{l 2.} Thereby, the front-end | tip of the vertical rib 110 contacts the level | step difference 221 of the needle base 201, and the excessive entry to the needle base 201 of the cover 100 is prevented. Therefore, the cover 100 is fitted to the injection needle 200 with a suitable adhesion force, and the pulling force of the cover 100 from the injection needle 200 does not have to be excessive.

The vertical rib 110 is parallel to the axis at least ₁₁ long from the above-mentioned rising position, and the cover 100 is moved to the right in the screwing direction, that is, toward the insertion port 101 with this portion as a connecting side. A slope 111 is provided on the front side in the direction of rotation when rotating. Specifically, the inclined surface 111 is a concave curved surface that rises smoothly from the inner peripheral surface 102, and is connected to the side surface of the longitudinal rib 110 on the front side in the screwing direction. Since the inner peripheral surface 102 of the cover 100 is slightly tapered toward the back of the cylinder, the inclined surface 111 has a substantially triangular shape as shown in FIG.

  In this way, the vertical rib 110 is provided with the inclined surface 111 only on one side, and so to speak, is formed so as to be left-right asymmetrical. Therefore, as shown in FIG. 3A or 3B, the screwing direction (clamping direction: right) In the reverse direction (longitudinal direction), the vertical rib 110 is press-fitted into the needle base rib 240 and can be overcome (idle) above a predetermined torque. Engage. In addition, in this application, although the line is drawn so that there may be a boundary between the rib and the slope in each drawing, it is conceptual.

  Since the breakage-resistant engagement structure 1 is configured as described above, when the injection needle 200 is screwed into the syringe 300 via the cover 100, if the tightening force is greater than or equal to a predetermined value, an idle rotation occurs, and the flange 211 is It is difficult to cause crushing or other damage to the needle base 201. On the other hand, the inclined surface 111, the longitudinal rib 110, and the needle base rib 240 are designed so that the fitting of the injection needle 200 to the syringe 300 is less than breakage.

  In addition, since the slope 111 is a surface that gradually rises, an impact force that causes the ribs to suddenly collide with each other unlikely is unlikely to occur, and this also improves the resistance to breakage.

  Further, the first step 241 portion of the needle base rib 240 interferes with the needle base rib 240, and the second step 242 that is connected has a slightly lowered rib height. Due to this shape, when the insertion depth of the cover 100 into the injection needle 200 is not sufficient, the vertical rib 110 immediately gets over the needle base rib 240, and therefore, when screwing is performed as compared with the case where the insertion depth is appropriate. The feeling of pinching the cover 100 is different. Therefore, it is possible to let the user naturally acquire a good tightening feeling from this difference in feel.

  The material of both the cover 100 and the needle base 201 is not particularly limited. For example, the cover 100 and the needle base 201 can be manufactured by injection molding as polypropylene. For convenience, the slope 111 and the vertical rib 110 have been described separately. However, since the slope 111 and the longitudinal rib 110 are integrally formed, the slope including the slope may be regarded as a rib.

  The torque when idling occurred was measured using the conventional product and the product of the present invention when the fastening speed was fast (when the impact force was large) and when the fastening speed was slow. It was confirmed that the torque was reduced by about 10% to 20%, and the frequency of breakage of the needle base was also reduced.

  The present invention is not limited to the above embodiment. FIG. 4 is an AA cross-sectional view conceptually showing various modes of engagement of the breakage-resistant engagement structure or breakage-resistant cover of the present invention. As shown in FIG. 4A, the inclined surface 111 may be connected at a position slightly lower than the upper surface 112 of the vertical rib 110. In this case, in order for the vertical rib 110 to get over the needle base rib 240, a further intermittent resistance is generated. By giving such an intermittent property, it is possible to let the user naturally acquire a good tightening feeling.

  In the above example, the cover 100 side is provided with a damage-resistant structure (slope 111). However, as shown in FIG. 4B, the injection needle 200 side is provided with a damage-resistant structure. It may be. That is, the inclined surface 243 may be provided on the front side of the needle base rib 240 in the screwing direction, that is, on the front side in the rotation direction when the cover 100 is rotated clockwise toward the insertion port 101.

  Further, in the examples of FIGS. 3B, 4A, and 4B, a slope is connected to the longitudinal rib 110 and the needle base rib 240, and so to speak, a torque relief surface is provided. The upper surface of the substrate itself may be tilted to improve breakage resistance. 4C, the upper surface of the vertical rib 110 is inclined, and in FIG. 4D, the upper surface of the needle base rib 240 is inclined. By this upper surface inclination, the climbing property in the screwing direction of the opposing ribs is increased. Further, since the rib becomes thin in the height direction, it has a structural bend, and from this point, it is possible to exhibit the overcoming property, that is, the breakage resistance.

  ADVANTAGE OF THE INVENTION According to this invention, the structure and cover which improve the attachment reliability to the syringe of an injection needle can be provided. This spring name can be used when screwing a member on one side without direct contact in a structure in which a luer lock is formed, not limited to an injection needle.

DESCRIPTION OF SYMBOLS 1 Damage-resistant engagement structure 100 Cover 101 Inner slot 102 (of cover) Inner peripheral surface 110 Vertical rib 111 Slope 112 Upper surface 200 Injection needle 201 Needle base 202 Needle 210 First cylinder 211 Flange 212 (in the first cylinder) Peripheral surface 213 Peripheral surface 220 (of the first cylinder) Second cylinder 221 Step 230 Third cylinder 231 Center hole 240 Needle base rib 241 First stage 242 Second stage 243 Slope 300 Syringe 301 Convex fitting part 310 Inner cylinder 311 Liquid guide Passage 312 Inner cylinder outer peripheral surface 320 Outer cylinder 321 Screwing groove l ₁ Extension length l of first stage 241 ₂ Insertion depth of first cylinder 210 into cover 100

Claims (5)

An engagement structure of an injection needle screwed into a syringe by a flange of a needle base end portion and a cover for a cylindrical injection needle that is inserted up to the needle base and integrated with the injection needle,
On the needle base outer periphery and the cover inner periphery, there are provided ridges that extend in the axial direction and are symmetrically arranged in the same number or multiples of one number or about several minutes and interfere with each other by rotation,
Rotation when turning the cover clockwise toward the insertion port A slope that rises from the front to the ridge of the cover is formed on the inner circumference of the cover and / or when the needle base is turned clockwise toward the needle A slope that rises from the front in the direction and reaches the ridge of the needle base is formed on the needle base outer periphery ,
When the cover is inserted into the injection needle to a predetermined depth, the cover and the needle base are brought into surface contact and integrated, and the needle base is screwed into the syringe, the idle rotation occurs over the slope of the ridge above a predetermined torque. A breakage-resistant engagement structure between the injection needle and the cover that suppresses breakage of the flange or needle base . An engagement structure of an injection needle screwed into a syringe by a flange of a needle base end portion and a cover for a cylindrical injection needle that is inserted up to the needle base and integrated with the injection needle,
On the needle base outer periphery and the cover inner periphery, there are provided ridges that extend in the axial direction and are symmetrically arranged in the same number or multiples of one number or about several minutes and interfere with each other by rotation,
Rotation direction when the cover is rotated clockwise toward the insertion port The upper surface of the ridge of the cover is formed as a slope whose front side is lower than the rear side, and / or rotation direction when the needle base is rotated clockwise toward the needle Forming the upper surface of the ridge of the needle base as a slope whose front side is lower than the rear side ,
When the cover is inserted into the injection needle to a predetermined depth, the cover and the needle base are brought into surface contact and integrated, and the needle base is screwed into the syringe, the idle rotation occurs over the slope of the ridge above a predetermined torque. A breakage-resistant engagement structure between the injection needle and the cover that suppresses breakage of the flange or needle base .   3. The needle ridge has a shape in which the height decreases stepwise toward the needle direction or a shape in which the height decreases continuously in the needle direction. 4. Breakage resistant engagement structure. It is a multi-stage cylindrical tone that is reduced in diameter toward the tip of the needle, and a needle base protrusion that extends in the axial direction on the outer periphery of the small diameter cylinder and is arranged rotationally symmetrically, and a flange that is screwed into the syringe at the base end. A cover for a cylindrical injection needle that is used for an injection needle having a formed needle base, is inserted to the needle base and is in surface contact with the needle base to be integrated with the injection needle,
Cover ridges that extend in the axial direction and rotationally symmetrical, are arranged in the same number as the needle base ridges, or multiples or a few of the number, and interfere with the needle base ridges by rotation,
A slope that rises from the front in the direction of rotation when turning the cover clockwise toward the insertion port and reaches the cover ridge,
Is formed on the inner circumference,
When attaching the injection needle by screwing it into the syringe through the cover, the needle base ridge will pass over the cover ridge at a predetermined torque or more, causing idle rotation, and preventing damage to the flange or needle base. Is a needle base damage resistant cover characterized in that the needle base protrusion and the cover protrusion maintain engagement. It is a multi-stage cylindrical tone that is reduced in diameter toward the tip of the needle, and a needle base protrusion that extends in the axial direction on the outer periphery of the small diameter cylinder and is arranged rotationally symmetrically, and a flange that is screwed into the syringe at the base end. A cover for a cylindrical injection needle that is used for an injection needle having a formed needle base, is inserted to the needle base and is in surface contact with the needle base to be integrated with the injection needle,
It has the same number as the needle base ridges in the axial direction and rotational symmetry, or a multiple or a multiple of that number, and has a cover ridge on the inner circumference that interferes with the needle base ridges by rotation,
The upper surface of the cover ridge is formed as a slope whose front side in the rotational direction when turning the cover clockwise toward the insertion port is lower than the rear side,
When attaching the injection needle by screwing it into the syringe through the cover, the needle base ridge will get over the cover ridge at a predetermined torque or more, causing idle rotation, and suppressing damage to the flange or needle base ,
A needle base breakage-resistant cover characterized by maintaining the engagement between the needle base protrusion and the cover protrusion when removed.

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