JP2013223720A - Puncture tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a puncture tool in which an inner needle can be housed inside an inner needle hub and also an outer needle hub can be detached from the inner needle hub just by the operation of pulling out the inner needle from the outer needle.SOLUTION: A puncture tool includes an outer needle 21, an outer needle hub 22, an inner needle 3, and a cylindrical injector 4 for holding a proximal end of the inner needle 3. The injector 4 has an inner needle hub 41 for holding the proximal end of the inner needle 3, and a cylindrical body 6 which includes a grasping means 71A for grasping the outer needle hub 22 and which is attached inside the inner needle hub 22 so as to be capable of freely advancing and retreating. By separating the inner needle hub 22 from the outer needle 21 along an axial direction and expanding the injector 4, the inner needle 3 pulled out from the outer needle 21 is housed inside the inner needle hub 41 or inside the inner needle hub 41 and inside the cylindrical body 6, also the grasping means 71A releases the outer needle hub 22 and the outer needle hub 22 is detached from the inner needle hub 41.

Description

  The present invention relates to a puncture device, and more particularly to a puncture device for placing an outer needle (catheter) in a blood vessel.

Conventionally, for example, a puncture device for placing an outer needle (catheter) as described in Patent Documents 1 and 2 in a blood vessel is known.
Such a puncture device includes an outer needle, an outer needle hub that holds the outer needle, an inner needle that has a distal end inserted into the outer needle, and a cylindrical inner needle that holds the proximal end portion of the inner needle inside. With a hub.

Specifically, the puncture device described in Patent Document 1 will be described with reference to FIG.
As shown in FIG. 24A, the puncture device 100 includes an outer needle 102a, an outer needle hub 102b, an inner needle 103 into which the distal end is inserted into the outer needle 102a, and a proximal end portion of the inner needle 103 inside. And a cylindrical inner needle hub 101 that is held in the cylinder.

  Then, a method of using the puncture device 100 will be described. As shown in FIG. 24A, the slide cover 104 is housed in the inner needle hub 101, and the distal end 103a of the inner needle 103 protrudes from the distal end of the outer needle 102a. In the state, the patient's body 110 is punctured (puncture needle).

Then, after sending the outer needle 102a into the body (see FIG. 25 (B)), the slide cover 104 is extended by pulling the inner needle hub 101 toward the hand with the outer needle 102a stabbed in the body, The distal end 103a of the inner needle comes out of the body (see FIG. 24C).
Further, by pulling the inner needle hub 101 in the same direction, the tip 103a of the inner needle 103 is held in the slide cover 104 without touching the hand.

Next, in this state, the inner needle hub 101 is rotated in the circumferential direction (see FIG. 24D), the entire slide cover 104 rotates in the same direction, and the holder 105 on the distal end side is released (removed). ).
As a result, only the outer needle 102a can be left in the body, the inner needle hub 101 containing the inner needle 103 can be removed, and the inner needle 103 can be discarded as it is (see FIG. 24E).

  In the puncture device described in Patent Document 2, although not shown, a hand is placed on the inner needle by pressing a pressing piece provided on the inner needle hub with the outer needle stabbed in the body. The inner needle can be accommodated inside the inner needle hub without being touched.

JP 2002-000727 A JP 2007-143876 A

As described above, in the conventional puncture device, the inner needle can be accommodated in the inner needle hub with the outer needle stabbed in the body, and the operation can be performed safely.
However, the puncture device described in Patent Document 1 is configured to remove the outer needle hub and the inner needle hub by a rotational operation different from the extraction operation, apart from the operation of extracting the inner needle from the outer needle. Has been.
Therefore, when removing the inner needle hub, an unnecessary force (load) is applied to the outer needle (catheter), which may cause pain to the patient, and a technical problem that smooth removal is difficult. there were.

  Further, in the puncture device described in Patent Document 2, if the pressing piece is forgotten to be pressed, the inner needle is discarded without being accommodated inside the inner needle hub, which is very dangerous for the operator. There was a technical problem that safety could not be ensured.

  The present invention has been made to solve the above technical problem, and the inner needle can be accommodated inside the inner needle hub only by the operation of pulling the inner needle out of the outer needle, and the outer needle hub. An object of the present invention is to provide a puncture device that can be removed from the inner needle hub.

  The puncture device according to the present invention made to solve the above technical problem includes an outer needle, an outer needle hub that holds a proximal end portion of the outer needle, and an inner needle in which a distal end portion is inserted into the outer needle. And a cylindrical injection tool that holds the proximal end portion of the inner needle, the injection tool comprising an inner needle hub that holds the proximal end portion of the inner needle, and the outer needle hub And a cylindrical body attached to the inside of the inner needle hub so as to be capable of moving forward and backward. The inner needle hub is spaced apart from the outer needle along the axial direction, and the injection is performed. By extending the tool, the inner needle pulled out from the outer needle is accommodated in the inner needle hub or in the inner needle hub and the cylindrical body, and the gripping means is in the outer needle. The hub is released, and the outer needle hub is detached from the inner needle hub.

According to such a configuration, by separating the inner needle hub along the axial direction (withdrawal) and extending the injection tool, the inner needle withdrawn from the outer needle is accommodated inside the inner needle hub, The gripping means releases (releases) gripping of the outer needle hub.
Accordingly, the outer needle hub can be removed from the inner needle hub only by pulling the inner needle out of the outer needle, and there is no risk of causing pain to the patient, and smooth removal can be easily performed. . Further, since the inner needle is always accommodated in the inner needle hub, the safety of the operator can be ensured.

  Here, the cylindrical body has an outer cylinder that is movably attached to the inside of the inner needle hub, and a plurality of arms that grip the outer needle hub, and is attached to the inside of the outer cylinder so as to be able to advance and retract. An arm opening and closing portion that opens and closes the plurality of arms when the inner tube is housed inside the outer tube or pulled out from the inside of the outer tube. The inner cylinder includes a through-hole through which the inner needle is inserted, an upright piece that is pushed out and raised by the inner needle of the through-hole and is locked to the outer cylinder, and the arm opening / closing portion. A plurality of arms for holding a catheter to be opened and closed, and by separating the inner needle hub from the outer needle along the axial direction and pulling out the inner needle, The locked state of the cylinder is released, and the arm opening / closing part of the outer cylinder is connected to the inner cylinder. Move Te, by opening a plurality of arms for gripping the outer needle hub, it is desirable that the outer needle hub is removed from the inner needle hub.

Thus, by pulling out the inner needle in the direction of separating the inner needle hub from the outer needle along the axial direction, the locked state of the outer cylinder and the inner cylinder by the standing piece is released, and the outer The arm opening / closing part of the cylinder can be moved with respect to the inner cylinder. Then, by moving the outer cylinder relative to the inner cylinder, the gripping state of the outer needle hub by a plurality of arms is released, and the outer needle hub is removed from the inner needle hub.
That is, the inner needle can be accommodated in the inner needle hub only by pulling the inner needle out of the outer needle, and the outer needle hub can be removed from the inner needle hub.

In addition, a groove portion is formed on the outer peripheral surface of the outer cylinder along the axis of the outer cylinder, and a protrusion portion accommodated in the groove portion is formed on the outer peripheral surface of the inner cylinder. Therefore, it is desirable that the forward / backward direction of the outer cylinder with respect to the inner cylinder is restricted.
In this case, the advancing and retreating direction of the outer cylinder with respect to the inner cylinder is regulated by the groove and the protrusion, and therefore the inner needle hub body can be pulled out in the direction away from the outer needle along the axial direction.

Further, when the outer cylinder and the inner cylinder are unlocked by the standing piece and the tip of the inner needle is pulled out through the standing piece, the standing piece may block the through hole of the inner needle. desirable.
In this case, once the inner needle is accommodated in the cylindrical body, the path to the outer needle side of the inner needle (through hole of the inner needle) is closed by the standing piece, so the inner needle is It will not jump out of the body again. Therefore, the inner needle can be securely stored in the inner needle hub.

  According to the present invention, it is possible to obtain a puncture device that can accommodate the inner needle in the inner needle hub and remove the outer needle hub from the inner needle hub only by pulling the inner needle from the outer needle. be able to.

FIG. 1 is a perspective view showing an appearance of a puncture device according to the first embodiment of the present invention. FIG. 2 is a perspective view showing a state where the protector of the puncture device in FIG. 1 is removed. FIG. 3 is an exploded perspective view excluding the protector of the puncture device according to FIG. 1. 4 is a longitudinal sectional view showing the puncture device shown in FIG. FIG. 5 is a longitudinal sectional view showing the puncture device of FIG. 1, and is a longitudinal sectional view different from the longitudinal sectional view of FIG. 4 in the direction of 90 degrees. 6A and 6B are diagrams showing an outer cylinder, in which FIG. 6A is a perspective view, FIG. 6B is a longitudinal sectional view, and FIG. 6C is a longitudinal sectional view different from the longitudinal sectional view of FIG. . FIG. 7 is a perspective view showing the inner cylinder. FIGS. 8A and 8B are views showing a state where the inner cylinder is expanded, in which FIG. 8A is a plan view and FIG. 8B is a cross-sectional view taken along line AA in FIG. FIG. 9 is a diagram showing a puncture state for explaining a procedure for using the puncture device shown in FIG. 1, wherein (a) is a longitudinal sectional view, and (b) is a longitudinal sectional view of (a). It is a longitudinal cross-sectional view from which a 90 degree | times direction differs. FIGS. 10A and 10B are views showing a state in which the inner needle hub for explaining the procedure for using the puncture device shown in FIG. 1 is extended, wherein FIG. 10A is a longitudinal sectional view, and FIG. 2) and a vertical cross-sectional view different from each other by 90 degrees. 11 is a view showing a state in which the extension of the inner needle hub for explaining the procedure of using the puncture device shown in FIG. 1 is completed, (a) is a longitudinal sectional view, and (b) is ( It is a longitudinal cross-sectional view in which the longitudinal cross-sectional view of a) differs in a 90 degree direction. 12 is a view showing a state in which an outer needle for indwelling the procedure for using the puncture device shown in FIG. 1 is placed, in which (a) is a longitudinal sectional view and (b) is a view of (a). It is a longitudinal cross-sectional view in which a 90 degree direction differs from a longitudinal cross-sectional view. FIG. 13 is a longitudinal sectional view showing the first embodiment, and is a view for explaining that the outer needle moves. FIG. 14 is a longitudinal sectional view showing the second embodiment. FIG. 15 is a longitudinal sectional view of the protector according to the second embodiment. 16A and 16B are diagrams of the protector shown in FIG. 15, where FIG. 16A is a perspective view, and FIG. 16B is a view as seen from the insertion side of the inner needle hub. FIG. 17 is a longitudinal sectional view showing the third embodiment. 18 is a longitudinal sectional view showing a state in which the outer cylinder has been pulled out from the state shown in FIG. FIG. 19 is a longitudinal sectional view showing a state in which the relay cylinder is pulled out from the state shown in FIG. FIG. 20 is a plan view showing a state in which the outer cylinder according to the fourth embodiment is pulled out and bent. FIG. 21 is a longitudinal sectional view according to the fourth embodiment shown in FIG. FIG. 22 is a perspective view of the fifth embodiment. FIG. 23 is a longitudinal sectional view of the fifth embodiment shown in FIG. It is a side view which shows the operation state concerning the conventional puncture device.

Hereinafter, a puncture device according to a first embodiment of the present invention will be described with reference to FIGS.
As shown in FIGS. 1 and 2, the puncture device 1 includes an outer needle 21, an inner needle 3 into which a distal end portion (left end portion on the paper surface) is inserted into the outer needle 21, and one end portion (base) of the inner needle 3. And a protector 5 that covers the outer needle 21 and the inner needle 3. Moreover, in the puncture device 1, all parts except the inner needle 3 are made of resin. In FIG. 1, the outer needle 21 and the inner needle 3 are covered with the protector 5 and cannot be seen.
The catheter 2 includes an outer needle 21 made of a flexible hollow tube and an outer needle hub 22 that holds the proximal end portion of the outer needle 21 as shown in FIGS.

  As shown in FIGS. 2 to 5, the injection device 4 is attached to a tubular inner needle hub body 41 and a proximal end (right end of the paper surface) of the inner needle hub body 41 by press fitting, and the inner needle 3 And a tail plug 42 having a substantially cylindrical needle holding portion 42a on which the proximal end portion is held.

The injection tool 4 includes an outer cylinder 6 attached to the inside of the inner needle hub main body 41 so as to be able to advance and retreat, and four arms 71A for gripping the outer needle hub 22. And an inner cylinder 7 attached to be freely movable.
In the present embodiment, the case where the four arms 71A are formed on the inner cylinder 7 is shown, but it is sufficient that the outer needle hub 22 can be held by two or more arms.

As shown in FIG. 6, the outer cylinder 6 includes a groove 61 formed along the axis of the shaft 64 of the outer cylinder 6 (formed along the advancing and retreating direction of the inner cylinder 7), and the four The arm opening / closing part 62 for accommodating the arm 71A is provided, and is formed in a cylindrical shape as a whole.
The four arms 71A are formed so as to be able to advance and retract while being guided by guide groove portions 62A formed on both sides of the inner surface of the arm opening / closing portion 62.

As shown in FIG. 5 and FIG. 6 (c), the groove 61 is formed so as to be symmetrical at two locations, the upper portion and the lower portion, on the peripheral surface of the outer cylinder 6.
4 and 5, when the inner cylinder 7 is accommodated in the outer cylinder 6, the four arms 71A are closed and the outer needle hub 22 is closed. Grip.
On the other hand, when the inner cylinder 7 is pulled out (advanced) from the outer cylinder 6, as shown in FIG. 11 and FIG. 12, the restriction by the guide groove 62A (arm opening / closing section 62) is eliminated. The four arms 71A are opened by the elastic force of itself, and the outer needle hub 22 is released.

  As described above, the four arms 71A and the arm opening / closing part 62 constitute a gripping means for gripping the outer needle hub 22, and the four arms 71A are retracted into the arm opening / closing part 62. 4 and 5, the outer needle hub 22 is gripped, and the four arms 71A are advanced from the arm opening / closing portion 62, as shown in FIGS. 12, the outer needle hub 22 is released.

Specifically, as shown in FIG. 3, the four arms 71 </ b> A are formed in a shape opened in advance with respect to the peripheral surface of the inner cylinder 7.
When the arm 71A of the inner cylinder 7 is inserted (accommodated) in the guide groove 62A (see FIG. 6) of the outer cylinder 6, the four arms 71A are closed by the arm opening / closing part 62. Is in a state. That is, the arm opening / closing part 62 closes the four arms 71 </ b> A so that the four arms 71 </ b> A grip the outer needle hub 22.

Further, when the inner cylinder 7 is pulled out (advanced) from the outer cylinder 6, the four arms 71A are extracted from the arm opening / closing part 62 as shown in FIGS. Return to the state.
That is, the four arms 71A are opened by the arm opening / closing part 62, and the four arms 71A are in a state of releasing the catheter 2.

As shown in FIG. 7, the inner cylinder 7 passes through a neck portion 71 having the four arms 71 </ b> A, a shaft portion 72 having a diameter smaller than that of the neck portion 71, and the centers of the neck portion 71 and the shaft portion 72. And it has the through-hole 73 which penetrates the said inner needle 3, and is shape | molded by the cylinder shape as a whole.
The shaft portion 72 is housed in the groove portion 61 of the outer cylinder 6 and is erected by being protruded by a projecting portion 72A formed to be movable and the inner needle 3 in the through hole 73. And an upright piece 72B to be engaged.

The protrusions 72A are formed so as to be symmetrical at two locations on the upper surface and the lower surface of the shaft portion 72 so as to correspond to the groove portions 61 (see FIG. 5). The groove 61 and the protrusion 72 </ b> A regulate the advance / retreat direction of the inner cylinder 7 relative to the outer cylinder 6 (the advance / retreat direction of the outer cylinder 6 relative to the inner cylinder 7).
When the inner cylinder 7 is advanced with respect to the outer cylinder 6, the protruding portion 72A is engaged with the end of the groove 61 so that the outer cylinder 6 and the inner cylinder 7 are not separated from each other. It is configured to be.

  Here, as shown in FIG. 8, the inner cylinder 7 includes a lower portion 7A (left side of the paper surface) provided with the upright piece 72B, and an upper portion 7B (right side of the paper surface) formed on the opposite side across the center line l. Are formed by folding the upper part 7A and the lower part 7B around a fold line (center line 1).

  Further, in the center of the lower portion 7A and the upper portion 7B, groove portions 73A and 73B having a semicircular cross section are formed along the axial direction of the inner cylinder 7, respectively. These groove portions 73A and 73B are formed with one through-hole 73 by folding the lower portion 7A and the upper portion 7B.

Further, as shown in FIG. 5, the upright piece 72 </ b> B is pushed out by the peripheral surface of the inner needle 3 when the inner needle 3 is inserted (accommodated) into the through-hole 73, and stands. Engage with the end of the groove 61.
Here, the upright piece 72B engages with the end portion on the catheter 2 side of the groove portion 61, so that it cooperates with the neck portion 71 of the inner cylinder 7 so as to sandwich the outer cylinder 6 therebetween. Locked to the outer cylinder 6.
In other words, when the inner needle 3 is present in the through hole 73, the upright piece 72 </ b> B is raised by the inner needle 3, and the outer cylinder 6 and the inner cylinder 7 are integrated, and the Drawing from the outer cylinder 6 is restricted.

Further, the upright piece 72B is housed in the inner cylinder 7 so as to close the through hole 73 when the inner needle 3 is pulled out from the through hole 73 and is not pushed out by the inner needle 3. (Reset), the engagement with the groove 61 is released.
In other words, the standing piece 72B is not locked to the outer cylinder 6 when the inner needle 3 is not present in the through-hole 73, so that the outer cylinder 6 and the inner cylinder 7 can be separated, and the outer The inner cylinder 7 can be extracted from the cylinder 6.

  The inner needle hub 41 and the end portions 41a and 63 of the outer cylinder 6 are formed with engaging portions, and when extended, the engaging portions formed on the end portions 41a and 63 are formed. By being locked, they are configured not to be separated (separated) from each other.

Next, the case where such a puncture device 1 is used will be described.
First, the protector 5 is removed from the puncture device 1 shown in FIGS. 1 and 4, and the catheter 2 and the inner needle 3 are exposed as shown in FIG. Then, as shown in FIG. 9, the outer needle 21 and the inner needle 3 are punctured into the blood vessel (the patient's body 110).

  Thereafter, in order to retain the outer needle 21, the inner needle hub 41 is moved along the axial direction in a direction away from the outer needle 21 (withdrawing operation is performed). By the pulling-out operation of the inner needle hub 41, the injection tool 4 is extended.

  Specifically, in a state where the outer needle 21 is indwelled, when the inner needle hub 41 is separated from the outer needle 21 along the axial direction (withdrawing operation in the direction of the arrow shown in FIG. 9), The needle hub 41 moves along the axial direction, and the injection device 4 extends as a whole. At this time, the outer needle hub 22 is held by the inner cylinder 7, and the inner cylinder 7 and the outer cylinder 6 are integrated by the standing piece 72B.

  Therefore, when the inner needle hub 41 holding the rear end portion (base end portion) of the inner needle 3 is moved along the axial direction, the inner needle 3 is similarly moved along the axial direction. And by pulling out from the outer needle 21, the extracted inner needle 3 is covered in the inner cylinder 7, the outer cylinder 6, and the inner needle hub 41 (see FIG. 10).

Further, the inner needle hub 41 is separated from the outer needle 21 along the axial direction. As shown in FIG. 11, when the tip of the inner needle 3 passes through the upright piece 72B, the upright piece 72B is not subjected to a force from the side surface of the inner needle 3, returns to the original state, and passes through the through hole 73. Block.
Thereby, even if the force which moves the inner needle hub 41 to the catheter 2 side acts, the movement of the inner needle 3 is regulated by the upright piece 72B and does not return into the outer needle 21 again.

Further, when the push-out of the upright piece 72B by the inner needle 3 is released, the locked state with the outer cylinder 6 is released. As a result, the outer cylinder 6 and the inner cylinder 7 can be separated, and the outer cylinder 6 moves along the axial direction as the inner needle hub 41 moves.
At this time, since the groove 61 is guided by the protrusion 72A, the outer cylinder 6 is pulled out from the inner needle hub 41 while being guided by the protrusion 72A of the inner cylinder 7.

Furthermore, when the inner needle hub 41 is moved away from the outer needle 21 along the axial direction, the outer cylinder 6 is moved, and the inner cylinder 7 is extracted from the outer cylinder 6, as shown in FIG. The four arms 71A are opened to release the holding state of the outer needle hub 22 by the four arms 71A.
That is, when the inner needle hub 41 is separated from the outer needle 21 along the axial direction and the injection device 4 is extended, the inner needle 3 extracted from the catheter 2 is moved into the inner cylinder 7 and the outer tube 7. When housed inside the cylinder 6 and the inner needle hub 41, the outer needle hub 22 is released from the state in which the outer needle hub 22 is held by the four arms 71A and the arm opening / closing portion 62.

Thereby, as shown in FIG. 12, while the catheter 2 (outer needle 21) is placed in the blood vessel, the inner needle 3 is pulled out from the outer needle 21 and accommodated in the inner needle hub 4, The outer needle hub 22 is removed from the injection tool 4.
Thus, the puncture device 1 can accommodate the inner needle 3 in the inner needle hub 4 only by pulling out the inner needle 3 from the outer needle 21, and the outer needle hub 22. Can be removed from the inner needle hub 4.

  In the first embodiment, the case where the cylindrical body is configured by the outer cylinder 6 and the inner cylinder 7 has been described as an example. However, the present invention is not particularly limited to this configuration. The puncture device may include a relay cylinder that extends the inner needle hub, the outer cylinder, and the inner cylinder. The cylindrical body has a gripping means for gripping the catheter, and may be attached so that it can be inserted into and retracted from the inner needle hub.

  In the first embodiment, the case where the gripping means is configured by the four arms 71A and the arm opening / closing portion 62 has been described as an example, but the present invention is not particularly limited to this configuration. When the inner needle pulled out from the outer needle is accommodated inside the cylindrical body by separating the inner needle hub from the outer needle along the axial direction and extending the injection tool, the gripping means What is necessary is just to be comprised so that a needle hub can be released.

Next, a second embodiment will be described based on FIGS. Note that members similar to those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
This embodiment is an improvement of the above-described first embodiment, and prevents the outer needle hub 22 (catheter 2) from moving (backlashing) inside the protector 5.
As a result, the outer needle hub 22 moves (rattles) inside the protector 5 so that the outer needle 21 covers the tip of the inner needle 2 as shown by the dotted line in FIG. Alternatively, the problem that the outer needle hub 22 cannot be removed from the inner cylinder 7 and punctured can be solved.

In the second embodiment, as shown in FIGS. 14 to 15, contact portions 5 </ b> A, 5 </ b> B, 5 </ b> C, and 5 </ b> D that are in pressure contact with the outer peripheral surface of the inner needle hub 41 are provided on the inner peripheral surface of the protector 5. .
The contact portions 5 </ b> A, 5 </ b> B, 5 </ b> C, and 5 </ b> D protrude from the inner peripheral surface of the protector 5 and extend along the axis of the protector 5 in parallel with the axis. The contact portions 5A, 5B, 5C, and 5D may be formed in a plurality. For example, it is preferable that four contact portions 5A, 5B, 5C, and 5D are provided as illustrated. Further, the contact portions 5A, 5B, 5C, 5D are preferably not in contact with the outer peripheral surface of the arm opening / closing portion 62 of the outer cylinder 6, but are preferably not in pressure contact even if they are in contact.

  An outer needle hub locking portion 5 </ b> E extending in the axial direction is provided on the inner peripheral surface of the tip portion of the protector 5. The outer needle hub locking portion 5E is formed in a cylindrical shape, the tip of the inner needle 3 is located in a space portion 5F provided at the center, and the end of the outer needle hub locking portion 5E is external. The needle hub 22 is configured to abut.

That is, as shown in FIG. 14, when the protector 5 covers the catheter 2 and the inner needle 3 (when the protector 5 is attached), the outer peripheral surface of the inner needle hub 41 and the contact portion 5A of the protector 5 5B, 5C, and 5D are press-contacted (fitted), and the outer needle hub 22 contacts the outer needle hub locking portion 5E.
Therefore, when the protector 5 is mounted, the outer needle hub 22 (catheter 2) is prevented from moving forward by the outer needle hub locking portion 5E, and the outer needle hub 22 (catheter 2) is moved rearward. Is blocked by an inner needle hub 41 fixed to the protector 5.
As a result, the catheter 2 is fixed and movement of the catheter 2 is prevented.

When the protector 5 is removed, the contact parts 5A, 5B, 5C, 5D do not contact the arm opening / closing part 62 of the outer cylinder 6, or even if they contact, the protector 5 moves. However, the arm opening / closing part 62 of the outer cylinder 6 does not move with the movement of the protector 5 and remains in that position.
As a result, even when the protector 5 is removed, the outer needle hub 22 (catheter 2) does not move relative to the inner needle 3, so the outer needle 21 moves forward from the tip of the inner needle 3, and the inner needle It is possible to prevent adverse effects such as covering the tip of 3.

Next, a third embodiment will be described based on FIG. 17, FIG. 18, and FIG. In addition, the same code | symbol is attached | subjected to the member similar to the member of 1st, 2nd embodiment, and the detailed description is abbreviate | omitted.
This third embodiment is an improvement over the second embodiment described above, and a relay cylinder is provided between the inner needle hub and the outer cylinder to extend the inner cylinder, and the inner needle hub is further removed from the outer needle. It is configured to be stretchable.

  As shown in FIGS. 17 and 18, a relay cylinder 8 that extends the outer cylinder 6 is provided between the inner needle hub 41 and the outer cylinder 6. The relay cylinder 8 is formed in a cylindrical shape, has an outer diameter dimension that can be accommodated in the inner needle hub 41, and an inner diameter dimension that can accommodate the outer cylinder 6 therein. A latching portion 8 a is formed at one end of the relay cylinder 8 and is configured to be latched by a latching portion formed at the end 63 of the outer cylinder 6. Further, a locking portion 8 b is formed at the other end of the relay cylinder 102 and is configured to be locked to a locking portion formed at the end portion 41 a of the inner needle hub 41.

Further, a vertically long opening 8 c is formed on the outer peripheral surface of the relay cylinder 8 in parallel with the central axis of the relay cylinder 8. Four openings 8 c are formed in the circumferential direction of the relay cylinder 8.
In this way, since the opening 8c is formed on the outer peripheral surface of the relay cylinder 8, the relay cylinder 8 is provided with flexibility, so that the pulling operation direction of the inner needle hub 41 is an oblique direction (inner needle 3 In the case where a bending force is applied to the relay cylinder 8, damage such as buckling of the relay cylinder 8 can be prevented.

  As described above, in the third embodiment, as shown in FIG. 19, the inner needle hub 4 can be further extended from the outer needle 21 (catheter 2), and the inner needle hub 41 can be pulled out in the direction in which the inner needle hub 41 is pulled out. Even when a bending force is applied to the relay cylinder 8 but not on the extension line of the needle 3, damage such as buckling of the relay cylinder 8 can be prevented.

  Next, a fourth embodiment will be described with reference to FIGS. Note that members similar to those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the first embodiment, when the pulling operation direction of the inner needle hub 41 is an oblique direction (a direction not on the extension line of the inner needle 3), a bending force is applied to the outer cylinder 6 (the shaft portion 64 of the outer cylinder 6). Will be added. Therefore, when the outer cylinder 6 is formed of a hard synthetic resin material or the like, the bending force cannot be withstood, and the shaft portion 64 of the outer cylinder 6 may be buckled (bent) or damaged. . Further, when the shaft portion 64 of the outer cylinder 6 is buckled (bent) or the like and is damaged, the outer cylinder 6 may come off from the inner needle hub 41 and the inner needle 3 may be exposed.

The fourth embodiment is an improvement of the first embodiment described above, and is characterized in that at least the outer cylinder 6 is formed of a soft synthetic resin such as polypropylene.
Specifically, as shown in FIGS. 20 and 21, when the pulling operation direction of the inner needle hub 41 is shifted by an angle θ from the extension line of the inner needle 3, a bending force acts on the shaft portion 64 of the outer cylinder 6.
At this time, since the outer cylinder 6 is formed of a soft synthetic resin such as polypropylene, the shaft portion 64 of the outer cylinder 6 is bent by the bending force, but breakage such as cracking can be prevented. Further, as a result of preventing the shaft portion 64 of the outer cylinder 6 from being damaged, there is no possibility that the outer cylinder 6 is detached from the inner needle hub 41 and the inner needle 3 is exposed.
The soft synthetic resin forming the outer cylinder 6 preferably has an elongation of 200% or more according to JIS K7113 (plastic testing method). Specifically, polypropylene is preferable.

In the above embodiment, the case where the outer cylinder 6 is formed of a soft synthetic resin has been described. However, other parts other than the inner needle 3, specifically, the inner needle hub 41, the inner cylinder 6, the outer needle hub. 22 and the outer needle 21 are also preferably formed of a soft synthetic resin material such as polypropylene.
As described above, when the inner cylinder 6, the outer cylinder 7, and the inner needle hub 41 are formed of a soft synthetic resin material such as polypropylene, the sliding resistance can be reduced. The drawing operation can be performed with a force of less than 0.8 N (Newton) and can be easily handled even by a user without a force.

  Note that the relay cylinder 8 described in the third embodiment may be formed of a soft synthetic resin material such as polypropylene. In this case, the opening 8c described in the third embodiment is not necessarily formed.

Further, a fifth embodiment will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the member similar to the member of 1st, 2nd embodiment, and the detailed description is abbreviate | omitted.
This embodiment is an improvement of the second embodiment described above, and is formed on the outer peripheral surface of the inner needle hub to form a gripping portion to be gripped when used by the user, thereby improving user convenience. There are features.

As shown in FIG. 22, the inner needle hub 41 is formed in a cylindrical shape. Therefore, when the protector 5 is removed from the puncture device 1 and the outer needle 21 and the inner needle 3 are punctured into the blood vessel (the patient's body 110), the cylindrical inner needle hub body 41 is used.
However, some users point out that it is difficult to perform a puncturing operation with the outer peripheral surface of the cylindrical inner needle hub body 41.

  In the fifth embodiment, as shown in FIGS. 22 and 23, a grip portion 9 that grips in parallel with the central axis of the inner needle hub 41 is formed on the outer peripheral surface of the distal end portion of the cylindrical inner needle hub 41. Has been. The grip portion 9 extends from the outer peripheral surface of the distal end portion of the inner needle hub 41 toward the catheter 2 (outer needle 21), and the distal end portion of the grip portion 9 is the distal end portion of the outer cylinder 6 (arm opening / closing portion 62). And corresponding positions.

Further, when the protector 5 is mounted on the inner needle hub 41, the protector 5 is provided with an opening 5G in order to avoid collision between the grip portion 9 and the protector 5. The opening 5G extends from the insertion end side (the end side opposite to the outer needle hub locking portion 5E) of the inner needle hub 41 to the outer needle hub locking portion 5E side.
Therefore, even when the protector 5 is attached to the inner needle hub 41, the protector 5 can be attached to the inner needle hub 41 without interfering with the grip portion 9.

  In the fifth embodiment configured as described above, the user can grasp the grip portion 9 and thereby perform the inner needle more than when performing the puncturing operation with the inner needle hub 41. 3 (outer needle 21) can be held close to the puncturing operation, and more appropriate puncturing can be performed.

DESCRIPTION OF SYMBOLS 1 Puncture tool 2 Catheter 21 Outer needle 22 Outer needle hub 3 Inner needle 4 Injection tool 5 Protector 6 Outer cylinder (tubular body)
7 Inner cylinder (tubular body)
7A Upper part 7B Lower part 41 Inner needle hub 42 Tail plug 42a Needle connection part 61 Groove part 62 Arm opening / closing part (gripping means)
71 Neck 71A Arm (gripping means)
72 Shaft portion 72A Protruding portion 72B Standing piece 73 Through hole 73A, 73B Groove portion 74 Internal space 74A, 74B Recessed portion 110 Patient's body

Claims (4)

An outer needle, an outer needle hub that holds the proximal end portion of the outer needle, an inner needle that has a distal end portion inserted into the outer needle, and a cylindrical injection tool that holds the proximal end portion of the inner needle A puncture device comprising:
The injection device includes an inner needle hub that holds a proximal end portion of the inner needle, and a cylindrical body that is attached to the inner needle hub so as to freely move forward and backward, and a gripping unit that grips the outer needle hub. ,
With
When the inner needle hub is pulled away from the outer needle by separating the inner needle hub from the outer needle along the axial direction and extending the injection tool, the inner needle hub is moved into the inner needle hub or the inner needle hub. And the inside of the cylindrical body,
The puncture device, wherein the gripping means releases the outer needle hub, and the outer needle hub is detached from the inner needle hub. The cylindrical body includes an outer cylinder that is attached to the inner needle hub so as to be movable forward and backward, and a plurality of arms that grip the outer needle hub, and is an inner cylinder that is attached to the inner cylinder so as to be movable forward and backward. And comprising
The outer cylinder has an arm opening / closing part that opens and closes the plurality of arms by accommodating the inner cylinder inside the outer cylinder or being pulled out from the outer cylinder,
The inner cylinder includes a through-hole through which the inner needle is inserted, an upright piece that is pushed out and raised by the inner needle of the through-hole and locked to the outer cylinder, and a catheter that is opened and closed by the arm opening and closing unit. A plurality of arms for gripping,
The inner needle hub is moved away from the outer needle along the axial direction, and the inner needle is pulled out, so that the locked state of the outer cylinder and the inner cylinder by the standing piece is released, and the arm of the outer cylinder is opened and closed. The puncture device according to claim 1, wherein the outer needle hub is removed from the inner needle hub by moving a portion with respect to the inner cylinder and releasing a plurality of arms that grip the outer needle hub. A groove portion is formed on the outer peripheral surface of the outer cylinder along the axis of the outer cylinder, and a protrusion portion accommodated in the groove portion is formed on the outer peripheral surface of the inner cylinder.
The puncture device according to claim 2, wherein the advancing / retreating direction of the outer cylinder with respect to the inner cylinder is regulated by the groove and the protrusion.   The locking state of the outer cylinder and the inner cylinder by the standing piece is released, and when the tip of the inner needle passes through the standing piece and is pulled out, the standing piece closes the through hole of the inner needle. The puncture device according to claim 2 or 3.

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