JP2007135786A - Medical puncture unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a puncture unit capable of highly precisely delivering the distal end of a puncture needle to a target position when puncturing the puncture needle in a living body. <P>SOLUTION: This medical puncture unit is provided with a puncture device 400 and a puncture assist device 500 regulating the moving direction of the puncture device 400 in puncture; and is characterized in that the puncture device 400 has a retaining section 402 retaining the puncture section 401 and a guiding object section 403 disposed in the side face of the retaining section 402, the puncture assist device 500 has a through-hole section 503 regulating the movement of the puncture direction of the puncture section 401 by sliding of the retaining section 402 in its inside in the puncture, and a groove section 504 regulating the circumferential movement of the puncture section 401 by the sliding of the guiding object section 403, and the groove section 504 has a rectilinear advancement groove section and a rotation groove section. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a medical puncture unit for puncturing a living body.

  Conventionally, when performing biopsy (removing and inspecting a piece of biological tissue suspected of cancer or tumor, etc.) or injecting a drug solution, a biopsy needle or a puncture needle such as an injection needle is used. I have punctured.

In general, it is important for the puncture to accurately reach the target site. For this reason, the target site in the living body and the position of the puncture needle are usually confirmed using a CT device or an ultrasonic device. (For example, refer to Patent Document 1).
JP 2000-107178 A

  However, it is not easy to make the tip of the puncture needle reach the target site with high accuracy. This is because, in general, the puncture needle does not advance straight in the living body due to its tip shape.

  This will be briefly described with reference to FIGS. FIG. 1 shows the shape of the tip of an injection needle. (A) is a view from the blade surface side (hereinafter, the blade surface side of the injection needle is referred to as “front”, and the side perpendicular thereto is referred to as “side surface”. (B) shows the state as seen from the side.

  As shown in FIG. 5A, the front end of the injection needle 100 is an isosceles triangle centered on the center line 101 (an isosceles triangle having an angle α as a vertex and a height a), As shown in FIG. 2B, the tip side surface side of the injection needle 100 is provided with a blade surface 103 (length b) having an angle β and a backcut surface 104 having an angle γ. A hole (102 of (a)) for chemical solution injection is provided. That is, the tip of the injection needle 100 has a symmetrical shape with the center line 101 as the center when viewed from the front, but has an asymmetric shape with respect to the center line 101 when viewed from the side.

  For this reason, as shown in FIG. 2, when the tip of the injection needle 100 advances in the living body in the direction of the arrow 201, when the drag F is received from the living body, the drag f1 is generated in the blade surface direction due to the decomposition of the force. The drag force f2 acts in the direction (202) orthogonal to the blade surface direction.

  As described above, the stress f2 acts on the tip of the injection needle 100, so that the tip of the injection needle 100 is bent in the vector direction of f2, and when traveling in the direction of the arrow 201 in the living body, the tip of the injection needle 100 is moved in the vector direction of f2. It will bend and advance.

  FIG. 3 shows a state in which the tip of the injection needle 100 is bent in the vector direction of f2 as it progresses in the direction of the arrow 201. As is clear from the figure, the puncture position and puncture direction of the injection needle 100 are determined so that the target portion 202 is on the extension line of the center line 101 of the injection needle 100 during puncture. As the tip of the injection needle 100 advances, the center line shifts from the target portion 202 (203 indicates the amount of shift), and when the tip of the injection needle 100 reaches the depth of the target portion 202, the injection needle The tip position of 100 is greatly deviated from the target part 202 (for example, when the distance to the target part is about 15 mm, the shift amount is about 1 mm).

  Thus, when the tip position of the injection needle 100 deviates from the target site 202, it is necessary to puncture again. However, such a puncture is a burden on the patient. For this reason, at the time of puncture, it is desirable that the target site can be accurately reached regardless of the tip shape of the puncture needle.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a puncture unit that can accurately reach a target position when puncturing a living body.

In order to achieve the above object, for example, a medical puncture unit according to the present invention has the following configuration. That is,
A medical puncture unit comprising a puncture device having a puncture unit that is punctured by a living body, and a puncture assisting device that defines an operation direction of the puncture device at the time of puncturing,
The puncture device is
A cylindrical holding part for holding the puncture part;
A guided portion disposed on a side surface of the holding portion,
The puncture assisting device is
At the time of puncturing, the holding portion slides inside, so that the through-hole portion that defines the operation of the puncturing portion in the puncturing direction;
A guide portion that regulates an operation of the puncture portion in a direction orthogonal to the puncture direction by sliding the guided portion during puncture, and
The guide portion includes a rectilinear guide portion for causing the puncture portion to advance straight in parallel with the puncture direction and a rotation guide portion for rotating the puncture portion in a direction perpendicular to the puncture direction during puncturing. It is characterized by.

  According to the present invention, it is possible to provide a puncture unit that can accurately reach a target position when puncturing a living body.

  Hereinafter, each embodiment of the present invention will be described in detail with reference to the accompanying drawings as necessary.

[First Embodiment]
1. Configuration of Puncture Device FIG. 4 is a view showing the appearance of the puncture device constituting the puncture unit according to one embodiment of the present invention. In this specification, the puncture unit refers to a puncture device 400 that includes a puncture unit that is punctured in a living body and a holding unit that holds the puncture unit, and a puncture assisting device that defines the operating direction of the puncture device 400 during puncture 500 (which will be described later).

  In FIG. 4, 401 is a puncture unit (here, a thermometer is embedded therein. In other words, puncture device 400 is a puncture-type thermometer for measuring the body temperature of the deep part of the living body. ), And is punctured in the living body and measures the temperature of the target site.

  The diameter of the puncture part 401 is preferably 0.4 to 1.2 mm, and the length is preferably 32 to 70 mm. The detailed shape of the tip is the same as in FIG. 1, and α = 80 degrees, β = 12 to 16 degrees, and γ = 20 to 40 degrees are preferable. In addition, although the puncture part 401 shall consist of nickel titanium, it does not specifically limit to this, For example, stainless steel may be sufficient. In addition, the tip of the puncture unit 401 is gold-plated with excellent radiopacity, so that it can be easily observed using a CT apparatus or the like. In addition to the gold plating described above, other metals having excellent radiopacity such as platinum may be used.

  Reference numeral 402 denotes a holding unit that holds the puncture unit 401. The holding part 402 has a columnar shape, and slides in a through hole (cylindrical through hole) of a puncture assisting device described later at the time of puncturing.

  Reference numeral 403 denotes a guided portion, which extends from the side surface of the holding portion 402 in the form of two protrusions perpendicular to the outside direction (hereinafter, for convenience of explanation, one guided portion is referred to as 403-1 and the other guided portion is referred to. Part may be referred to as 403-2). The guided portion 403 slides along the guide portion (guide groove) of the puncture assisting device as the holding portion 402 slides in the through hole.

  Reference numeral 404 denotes a handle portion that is connected to the holding portion 402. When the holding portion 402 is pressed by the handle portion 404, the puncture portion 401 advances toward the target site in the living body, and when the holding portion 402 is pulled by the handle portion 404, the puncturing portion 401 moves backward in the living body.

  The holding portion 402, the guided portion 403, and the handle portion 404 are all made of polyphenylene sulfide, but the material is not particularly limited thereto.

2. Configuration of Puncture Auxiliary Device FIG. 5 is a diagram showing the appearance of a puncture assist device that constitutes a puncture unit according to an embodiment of the present invention. The puncture assisting device 500 is fixed at the puncture position on the surface of the living body when the puncture device 400 performs puncture, and plays a role of defining the operation direction of the puncture device.

  In FIG. 5, reference numeral 501 denotes a buffer, which is a member that comes into contact with the surface of the living body when the puncture assisting device is fixed at the puncture position. The buffer unit 501 is made of polycarbonate. Reference numeral 502 denotes a drum portion having a through hole 503 inside, and a guided groove 504 communicating with the through hole 503 on the side surface. The drum portion 502 is made of poniphenylene sulfide, but the material is not particularly limited to this. For example, the drum portion 502 is formed of a transparent member so that the tip of the puncture portion 401 can be seen at the time of puncture. May be.

  The holding portion 402 of the puncture device 400 slides through the through-hole 503 during puncture. The movement of the puncture device 400 around the x axis and the z axis is defined by the through hole 502. Reference numeral 504 denotes a guide groove, and is configured such that the guided portion 403 of the puncture apparatus 400 slides during puncture (that is, two guide grooves are formed in the drum portion 502 (hereinafter, for convenience of explanation, 504). -1 and 504-2))), and the guided portion 403 slides while fitting into the guide groove 504, whereby the movement of the puncture device 400 around the y-axis is defined.

  The guide groove 504 is linearly provided on the side surface of the drum unit 502 from the end surface 505 in the y-axis direction (the puncturing direction of the puncturing unit 401). After changing the direction in the circumferential direction (direction substantially perpendicular to the puncturing direction of the puncture unit 401) and making a half turn in the circumferential direction, the line extends linearly again in the y-axis direction.

  The configuration of the puncture assisting device will be further described in detail with reference to FIGS. 6 and 7 show a plan view when the puncture assisting device 500 is viewed from the y-axis direction and a cross-sectional view when viewed from the x-axis and z-axis directions, respectively. The position is different.

  As shown in the plan view of the puncture assisting device 500 shown in FIG. 6A, the puncture device assisting device 500 has a through hole 503 at the center of the drum portion 502, and guide grooves 504 are arranged on both sides of the through hole 503. ing.

  In the plan view of the puncture assisting device 500 shown in FIG. 6A, a cross-sectional view taken along the line BB is FIG. 6B. FIG. 6C is a cross-sectional view taken along the line CC.

  As shown in FIG. 6B, the through hole 503 penetrates from the end surface 505 to the buffer portion 501. Further, the guide groove 504 extends to the vicinity of the center of the drum portion 502 in the y-axis direction (601, 602), changes its direction 180 degrees in the circumferential direction of the drum portion 502 near the center, and again (from 603, 604). It extends toward the buffer portion 501. As a result, the guided portion 403-1 located at the position indicated by 601 before rotating 180 degrees moves to the position indicated by 604 after rotating 180 degrees, and is guided by the position indicated by 602 before rotating 180 degrees. 403-2 moves to a position indicated by 603 after rotating 180 degrees.

  Since guided portions 403-1 and 403-2 of the rotating puncture apparatus 400 pass through the vicinity of the center of the drum unit 502, the drum unit 502 is viewed in a CC cross section (FIG. 6C). The guide groove 504 appears in the vicinity of the center.

  In the plan view of the puncture assisting device 500 shown in FIG. 7A, a cross-sectional view taken along the DD cross section is shown in FIG. 7B. FIG. 7C shows a cross-sectional view taken along the line EE. In FIG. 7B, a guide groove 504 through which one of the guided portions 403 of the puncture apparatus 400 rotating near the center of the drum portion 502 passes is provided obliquely in the circumferential direction of the drum portion 502. The situation is shown.

  Further, in FIG. 7C, the guide groove 504-1 changes its direction in the circumferential direction toward the lower side of the paper surface when it goes straight to the vicinity of the center of the drum portion 502 in parallel with the puncture direction and approaches the center. The guide groove 504-2 for the other guided portion to slide from above the paper surface appears, and when it reaches the position where rotation by 180 degrees has been completed, it is shown extending again in the straight direction.

  Due to the characteristic shape of the guide groove 504 as described above, in the puncture unit according to the present embodiment, when the handle portion 404 of the puncture device 400 presses the holding portion 402, the holding portion 402 goes straight in the through hole 503, When the vicinity of the center of the drum portion 502 is reached, the holding portion 402 rotates 180 degrees and then goes straight through the through hole 502 again.

3. Puncture operation by puncture unit The puncture operation by the puncture unit according to the present embodiment will be described with reference to FIGS. FIG. 8 shows a state where the puncture device 400 is set in the puncture assisting device 500 before puncturing. At this time, the tip of the puncture unit 401 is on the surface of the living body.

  Subsequently, when the holding unit 402 goes straight through the through-hole 503, the tip of the puncture unit 401 is punctured into the living body. When the holding portion 402 reaches the vicinity of the center of the drum portion 502, the guide groove 504 changes its direction in the circumferential direction, so that the guided portion 403 moves along the guide groove 504. As a result, the holding portion 402 rotates 180 degrees. As the holding unit 402 rotates, the puncture unit 401 also rotates 180 degrees.

  After the guide groove 504 has made a half turn in the circumferential direction, the guided portion 403 moves along the guide groove 504 again, and as a result, the holding portion 402 moves straight again. Start.

  FIG. 9 shows a state in which the guided portion 403 has reached the end of the guide groove 504 as a result of going straight. At this time, the tip of the puncture unit 401 reaches the target site.

  After the guided portion 403 reaches the end of the guide groove 504 and hits the buffer portion 501, the distal end portion of the puncture portion 401 is imaged using a CT device, an ultrasonic device, or the like. Thereby, it can be confirmed that the tip of the puncture unit 401 has reached the target site (as described above, since the tip of the puncture unit 401 is gold-plated, it is easily confirmed. be able to).

  After confirming that the tip of the puncture unit 401 has reached the target site, the energy radiation device (not shown) is used to measure the energy from outside the body toward the target site while measuring the internal temperature of the living body. And heat treatment is applied to the target area. The amount of energy radiated at this time is controlled based on the measurement result of a thermometer attached to the distal end portion of puncture portion 401.

  After puncturing, the puncturing unit 401 is pulled out of the living body by an operation opposite to the above operation. However, the puncture unit 401 may be pulled out from the living body by simultaneously pulling the puncture device 400 and the puncture assisting device 500 in the direction opposite to the puncture direction.

4). Action of Puncture Operation by Puncture Unit Next , the action of the puncture operation by the puncture unit will be described with reference to FIG. As described above, when puncturing is performed using the puncturing unit according to the present embodiment, the puncture device 400 rotates 180 degrees while the puncture unit 401 proceeds toward the target site, and accordingly, the puncture unit 401 also rotates 180 degrees.

  FIGS. 10A and 10B show the drag force received by the puncture unit 401 from the living body before the puncture unit 401 rotates 180 degrees, and the puncture unit 401 receives from the living body after the 180 degree rotation. It is a figure showing each drag. As described in the prior art, when the puncture unit 401 advances in the direction of the arrow 1001 in a state before 180 ° rotation, when the drag F is received from the living body, the drag f1 is perpendicular to the blade surface direction in the blade surface direction ( 1002) will have a drag force f2. And by f2 acting on the front-end | tip of the puncture part 401, the front-end | tip of the puncture part 401 will be bent in f2 direction, and will advance to f2 direction (in the case of Fig.10 (a)).

  On the other hand, when the puncture unit 401 advances in the direction of the arrow 1001 in a state after being rotated by 180 degrees, when the drag F is received from the living body, the drag f1 ′ in the blade surface direction is dragged in the direction (1003) perpendicular to the blade surface direction. 'Will work. Then, the stress f2 ′ acts on the tip of the puncture unit 401, so that the tip of the puncture unit 401 is bent in the vector direction of f2 ′ and proceeds in the vector direction of f2 ′ (in the case of FIG. 10B). ).

  That is, the direction of bending of the tip of the puncture unit 401 is opposite before and after rotation by 180 degrees. For this reason, it is possible to accurately reach the target site by recovering the bent portion of the tip of the puncture unit 401 that has been advanced through the living body before the rotation by 180 degrees after the rotation by 180 degrees.

  FIG. 11 is a diagram illustrating an operation of the tip of the puncture unit 401 when puncturing is performed using the puncture unit according to the present embodiment. In the figure, reference numeral 1101 denotes a target part, and 1102 denotes a straight line connecting the target part and the puncture position. It is assumed that puncture needle 401 advances in the direction of arrow 1001.

  In the state 1, the blade surface of the puncture unit 401 faces upward in the drawing. For this reason, as it advances in the direction of the arrow 1001, the straight line 1102 shifts to the lower side of the drawing. State 2 shows a state of the puncture unit 401 when puncturing is performed up to an intermediate position between the puncture position and the target site 1101. As shown in the figure, the puncture portion 401 in the state 2 is greatly deviated from the straight line 1102 downward in the drawing.

  Here, when the puncture device 400 is rotated 180 degrees by the puncture assisting device 500, the tip of the puncture unit 401 is also rotated by 180 degrees, as shown in state 3 (the blade surface of the puncture unit 401 faces downward in the drawing). )

  In this state, when the puncture unit 401 is advanced in the direction of the arrow 1001, the puncture unit 401 is moved upward in the drawing. As a result, when puncturing to the depth of the target site 1101, the tip of the puncture unit 401 returns to the straight line 902 (state 4).

  That is, by returning the amount of deviation from the straight line 901 between the state 1 and the state 2 to the state between the state 3 and the state 4, the target part 1101 can be reached.

  As is apparent from the above description, by using the puncture unit according to the present embodiment, the tip of the puncture unit can be accurately reached at the target site when puncturing a living body.

[Second Embodiment]
In the first embodiment, the length of the puncture unit has been described as being fixed. However, the length of the puncture unit may be variable according to the depth from the puncture position of the target site.

  In the first embodiment, the puncture device is operated in the puncture direction until the guided portion reaches the end of the guide groove. However, the present invention is not limited to this, and the guided portion is not guided in the guide groove. If the tip of the puncture unit reaches the target site before reaching the end of the puncture, the puncture operation may be terminated.

  In FIG. 12, (a) shows the puncture part of the puncture apparatus used when the puncture depth is shallow, and (b) shows the puncture part of the puncture apparatus used when the puncture depth is deep. 13 shows a state where puncturing is performed using the puncturing apparatus having the puncturing unit shown in FIG. 12 (a), and FIG. 14 shows puncturing using the puncturing apparatus having the puncturing unit shown in FIG. 12 (b). The situation is shown respectively.

  As can be seen from FIGS. 12 and 13, the length m1 from the tip of the puncture portion to the guided portion is “1/2 of the puncture depth (= L) (½ L)” and “puncture assist” It is a length (= 1 / 2L + l) obtained by adding the distance from the rotation position of the apparatus to the contact end surface with the living body (= l) ". By having such a relationship, when the puncture device is set so that the guided portion 403 is positioned at a position 1/2 L from the rotational position of the puncture assisting device (FIG. 13A), the tip of the puncture portion is a living body. It will be located on the surface.

  When the puncture device is moved in the puncture direction by ½ L, the puncture device rotates 180 degrees, and when the puncture device is further moved by ½ L, the tip of the puncture unit reaches the target site (FIG. 13B). That is, the distance traveled before the 180-degree rotation is equal to the distance traveled after the 180-degree rotation.

  Similarly, when the puncture depth is deep, the length m2 from the tip of the puncture portion to the guided portion is "1/2 length (1 / 2L ') of puncture depth (= L')", The length is a sum of “distance from the rotational position of the puncture assisting device to the contact end surface with the living body (= l)”. By having such a relationship, when the puncture device is set so that the guided portion is positioned at a position 1/2 L ′ from the rotational position of the puncture assisting device (FIG. 14A), the tip of the puncture portion is a living body. It will be located on the surface.

  When the puncture device is moved in the puncture direction by ½ L ′, the puncture device rotates 180 degrees, and when the puncture device is further moved by ½ L ′, the tip of the puncture unit reaches the target site (FIG. 14B). . That is, the distance traveled before the 180-degree rotation is equal to the distance traveled after the 180-degree rotation.

  In this way, by making the length of the puncture portion variable according to the puncture depth of the target site, it is possible to puncture the target site with various puncture depths using a common puncture assisting device. Become.

  In this embodiment, the length from the tip of the puncture portion to the guided portion is made variable according to the puncture depth. However, the present invention is not limited to this, and the puncture is made according to the puncture depth. The length of the auxiliary device may be variable. In this case, when the tip of the puncture unit is on the surface of the living body, the length of the puncture assisting device is varied so that the distance from the guided portion to the rotational position of the puncture assisting device is ½ of the puncture depth. It will be. Accordingly, it is possible to deal with target sites having various puncture depths by preparing only one type of puncture device with a fixed puncture length.

  However, the puncture assisting device may be adapted by preparing various types having different lengths, even if the length is not variable.

[Third embodiment]
In the second embodiment, the movement distance in the puncture direction of the puncture apparatus before 180 degrees rotation is ½ L, and the movement distance in the puncture direction of the puncture apparatus after 180 degrees rotation is 1/2 L. This is not particularly limited. You may make it the movement distance before and behind 180 degree | times rotation differ.

  For example, the biological tissue from the puncture position to the target site is not necessarily the same, and the biological tissue may change depending on the depth from the puncture position. In such a case, the drag from the living body is not constant at the tip of the puncture unit, and the drag changes depending on the puncture depth. As a result, the amount of deviation before 180 ° rotation is not equal to the amount of deviation after 180 ° rotation. Therefore, in consideration of such a case, the length of the puncture portion may be set by appropriately allocating the movement distance before and after the rotation by 180 degrees.

  In the second embodiment, the case where the tip of the puncture portion reaches the target site before the guided portion reaches the end of the guide groove has been described. You may make it arrange | position the stopper which prevents progress of a to-be-guided part in a position. Thereby, the situation where the front-end | tip of a puncture part will puncture deeper than the target site | part can be avoided.

[Fourth Embodiment]
In the first and second embodiments, the puncture device 400 is provided with the guided portion and the puncture assisting device 500 is provided with the guide groove. However, the present invention is not limited to this, and the puncture device 400 is provided with the guided groove. The puncture assisting device 500 may be provided with a guide portion.

[Fifth Embodiment]
Although the puncture target is not particularly mentioned in the first and second embodiments, the puncture unit according to the present invention is, for example, to the prostate, liver, pancreas, heart, bone, brain, breast, lung, kidney, etc. It is possible to apply to puncture.

  In the first and second embodiments, no specific numerical value is described for the puncture depth. However, the puncture unit according to the present invention is particularly effective, for example, at a puncture depth of 15 mm or more. This is because, when the puncture depth is 15 mm or more, in the case of the conventional technique, the puncture depth is shifted from the target site by 1 mm or more.

  In the first and second embodiments, the puncture unit for measuring the temperature in the living body has been described. However, the puncture unit according to the present invention is, for example, a biopsy (a biological tissue piece suspected of cancer or tumor). It may be used for collection of a piece of biological tissue at the time of excision.

  Moreover, it is also possible to apply to a puncture device used at the time of ablation (applying energy to a living tissue and cauterizing) where the tip is an electrode. Furthermore, it is also possible to apply to a puncture device for placing a granular body having a diameter of about 1 mm that emits radiation at a target site during radiotherapy. Furthermore, the present invention can be applied to a puncture device that injects bone cement, a bone regeneration agent, or the like into bone weakened by osteoporosis or the like.

  In each of the above embodiments, a protruding member is exemplified as the guided portion and a groove-like member is exemplified as the guide portion (guide groove), but the present invention is not limited to this. For example, a guide groove may be formed in the holding portion that holds the puncture portion, and a protruding guide portion may be formed on the inner surface of the through-hole portion of the puncture assisting device.

It is the figure which showed the front-end | tip shape of a common injection needle. It is the figure which showed the drag received from a biological body when the front-end | tip of an injection needle advances in the biological body. It is the figure which showed a mode that the front-end | tip of an injection needle was bent in the stress f2 direction as it advanced in the living body. It is a figure which shows the external appearance of the puncture apparatus which comprises the puncture unit concerning one Embodiment of this invention. It is a figure which shows the external appearance of the warrior assistance apparatus which comprises the puncture unit concerning one Embodiment of this invention. They are a top view at the time of seeing a puncture assistance apparatus from the y-axis direction, and a sectional view at the time of seeing from the x-axis and z-axis directions. It is a top view at the time of seeing a puncture assistance apparatus from the y-axis direction, and sectional drawing at the time of seeing from the x-axis and z-axis directions. It is the figure which showed a mode that the puncture apparatus was set to the puncture assistance apparatus before puncture. It is the figure which showed a mode that the to-be-guided part reached | attained to the terminal end of a guide groove as a result of making a puncture apparatus advance straight. It is a figure for demonstrating the effect | action of the puncture operation | movement by a puncture unit. It is the figure which showed operation | movement of the front-end | tip of the puncture needle 401 at the time of puncturing using the puncture unit concerning one Embodiment of this invention. It is a figure which shows the puncture apparatus from which the length of a puncture part is variable with puncture depth. It is a figure which shows the mode in the case of puncturing using the puncture apparatus which has a puncture part shown to Fig.10 (a). It is a figure which shows a mode in the case of puncturing using the puncture apparatus which has a puncture part shown in FIG.10 (b).

Claims (6)

A medical puncture unit comprising a puncture device having a puncture unit that is punctured by a living body, and a puncture assisting device that defines an operation direction of the puncture device at the time of puncturing,
The puncture device is
A cylindrical holding part for holding the puncture part;
A guided portion disposed on a side surface of the holding portion,
The puncture assisting device is
At the time of puncturing, the holding portion slides inside, thereby allowing the through-hole portion to regulate the operation of the puncturing portion in the puncturing direction;
A guide portion that regulates an operation of the puncture portion in a direction orthogonal to the puncture direction by sliding the guided portion during puncture, and
The guide portion includes a rectilinear guide portion for moving the puncture portion straight in parallel with the puncture direction and a rotation guide portion for rotating the puncture portion in a direction orthogonal to the puncture direction during puncturing. A medical puncture unit characterized by The guide portion includes two linear guide portions and one rotation guide portion with respect to the puncturing direction, and the rotation guide portion is disposed between the two linear guide portions. The medical puncture unit according to claim 1, wherein The medical puncture unit according to claim 2, wherein the rotation guide portion rotates 180 degrees in a direction orthogonal to the puncture direction by sliding the guided portion on the rotation guide portion. The medical puncture unit according to claim 1, wherein a distance from a tip of the puncture portion to the guided portion is variable. The medical puncture unit according to claim 1, wherein a tip shape of the puncture portion is asymmetric. The medical puncture unit according to any one of claims 1 to 5, wherein the guided portion is a protrusion-like member, and the guide portion is a groove fitted to the guided portion.

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