JP6144936B2 - Puncture tool - Google Patents

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 in a blood vessel as described in Patent Document 1 is known.
Such a puncture device includes an outer needle, an outer needle hub, an inner needle into which a distal end portion is inserted into the outer needle, and a cylindrical inner needle hub that holds a proximal end portion of the inner needle inside. .

Specifically, the puncture device described in Patent Document 1 will be described with reference to FIG.
As shown in FIG. 15A, the puncture device 100 includes an outer needle 102a, an outer needle hub 102b, an inner needle 103 into which a distal end is inserted into the outer needle 102a, and a proximal end portion of the inner needle. A cylindrical inner needle hub 101 is provided.

  Then, a method of using the puncture device 100 will be described. As shown in FIG. 15A, 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).

Thereafter, after the outer needle 102a is sent into the body (see FIG. 15B), 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. 15C).
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. 15D), the entire slide cover 104 rotates in the same direction, and the distal end side holder 105 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. 15E).

  In the puncture device, in addition to the shape shown in FIG. 15, as shown in FIG. 16, a pair of wings extending on the left and right sides of the outer needle hub 102b and integrally formed with the outer needle hub 102b are provided. Some have 105. The pair of wings 106 are used to fix the wings 106 to the skin with an adhesive tape or the like and prevent the catheter 102 from being displaced. Such a puncture device is disclosed in Patent Document 2.

JP 2002-000727 A JP-A-10-179734

  By the way, in the conventional puncture device, when the outer needle 102a is punctured into the patient's body 110, it is necessary that the tip 103a of the inner needle 103 protrudes from the tip of the outer needle 102a. Therefore, before using the puncture device, a cap-shaped protector is put on the outer needle 102a and the inner needle 103 so that the axial positions of the inner needle 103 and the outer needle 102a do not deviate. There was a request to protect.

However, in the puncture device in which the wing 106 is provided on the side surface of the outer needle hub 102b as shown in FIG. 16, the wing 106 becomes an obstacle when the protector is put on.
That is, there is a problem that the entire outer needle hub 102b cannot be covered with the protector. Moreover, when the protector which can accommodate the wing | blade 106 was formed, the subject that it became a very large protector occurred.

  The present invention has been made to solve the above technical problem, and even when the outer needle hub for holding the outer needle is provided with a wing, the protector for covering the outer needle hub is enlarged. An object of the present invention is to provide a puncture device that can be securely attached without any trouble, protect the outer needle and the inner needle protruding from the outer needle, prevent positional displacement thereof, and ensure safety.

A 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 has a protruding portion on a side surface, and the outer needle. A puncture device including an inner needle into which a distal end portion is inserted, a cylindrical inner needle hub that holds a proximal end portion of the inner needle, and a protector that covers the outer needle, wherein the protector includes the outer needle A main body having an opening at the opposite end of the lower surface and the cylindrical portion, and a cylindrical portion that extends in the axial direction from the cylindrical portion to form an upper surface and a side surface of the protector. A rib-shaped frame formed on the outer peripheral surface on the opposite end side of the cylindrical portion, and a locked projection formed on the inner peripheral surface of the main body portion on the opposite end side of the cylindrical portion, and the inner needle hub has a rib-like projection for locking the object to be locking projections formed on the outer circumferential surface of one end side, The protrusion portion of the outer needle hub is disposed in the opening on the lower surface of the protector, and one end side of the inner needle hub is inserted from the opening on the opposite end side of the cylindrical portion of the protector. The locking protrusion is locked to the rib-shaped protrusion of the inner needle hub, and the outer needle is accommodated in the cylindrical portion.

According to such a configuration, since the opening is provided in the lower surface of the main body of the protector, a protruding portion (such as the wing 106 shown in FIG. 16) can be disposed in the opening, and the protector is The inner needle hub can be fitted without interfering with the protruding portion.
That is, even when the outer needle hub is provided with a protrusion such as a wing, the protector can be securely attached without increasing the size, and the cylindrical portion protrudes from the outer needle and the tip of the outer needle. The inner needles can be accommodated and protected to prevent their positional shifts and to ensure safety.
In addition, since the rib-like frame is formed on the main body, the strength of the main body having an opening on the lower surface and the opposite end of the cylindrical portion can be increased, and the deformation of the protector can be suppressed. it can.

  Here, it is desirable that the height of the rib-shaped frame from the outer peripheral surface of the main body is formed to a dimension that can be used by a user's finger. When the rib-like frame is formed in this way, the user can easily remove the protector from the inner needle hub by placing a finger on the rib-like frame with one hand.

Further, the protector has a contact portion that protrudes from the inner peripheral surface of the main body portion and extends in parallel with the axis along the axis of the main body portion from the opening on the opposite end side of the cylindrical portion, When the one end side of the inner needle hub is inserted from the opening on the opposite end side of the cylindrical portion of the protector, it is desirable that the contact portion is in pressure contact with the outer peripheral surface of the inner needle hub.
In this way, the outer peripheral surface of the inner needle hub is not in pressure contact with the entire inner peripheral surface of the main body, but is in pressure contact with the contact portion, so that an appropriate sliding resistance is obtained, and when the protector is mounted and removed Accidents can be suppressed.

The protector has a guided portion that protrudes from the inner peripheral surface of the main body and extends in parallel with the axis along the axis of the main body from the opening on the opposite end side of the cylindrical portion. The rib-shaped projections are formed at a predetermined interval, and when the one end side of the inner needle hub is inserted from the opening on the opposite end side of the cylindrical portion of the protector, the guided portion is the rib-shaped projection. It is desirable that the ribs are guided through the gaps.
As described above, when the protector is mounted on the inner needle hub, the protector is guided, and the inner needle hub and the protector can be reliably fitted.

It is desirable that a presser protrusion that is in contact with the guided portion is formed on the outer peripheral surface of the inner needle hub closer to the proximal end portion of the inner needle than the rib-shaped protrusion.
In this way, when the guided portion is in contact with the presser protrusion, the protector can be prevented from rattling with respect to the inner needle hub. In particular, when the protector is mounted on the inner needle hub, inclination (deformation) of the protector toward the lower surface opening can be suppressed.

  According to the present invention, even when the outer needle hub for holding the outer needle is provided with a wing, the protector for covering the outer needle hub is securely attached without increasing the size of the outer needle and the outer needle. The inner needle protruding from the needle can be protected to prevent the displacement of those needles, and a safety surface can be secured to obtain a puncture device.

FIG. 1 is a perspective view showing an appearance of a puncture device according to one embodiment of the present invention. FIG. 2 is a side view of the puncture device of FIG. FIG. 3 is a perspective view showing a state where the protector of the puncture device in FIG. 1 is removed. FIG. 4 is a perspective view showing a state where the puncture device of FIG. 1 is disassembled. FIG. 5 is a view showing the puncture device shown in FIG. 1, wherein (a) is a longitudinal sectional view, and (b) and (a) are longitudinal sectional views different from each other by 90 °. 6A and 6B are diagrams showing an inner needle hub of the puncture device shown in FIG. 1, wherein FIG. 6A is a side view and FIG. 6B is a longitudinal sectional view. FIG. 7 is a perspective view of the inner needle hub shown in FIG. FIGS. 8A and 8B are views showing the outer cylinder, in which FIG. 8A is a perspective view, FIG. 8B is a longitudinal sectional view, and FIG. FIG. 9 is a perspective view showing the inner cylinder. FIG. 10 is a perspective view of the protector. FIG. 11 is a perspective view seen from the lower side (lower surface side) of the protector. FIG. 12 is a longitudinal sectional view of the protector. FIGS. 12A and 12B are views of a puncture device for explaining a procedure for attaching a protector, wherein FIG. 12A is a side view and FIG. 12B is a longitudinal sectional view. FIG. 14 is a longitudinal sectional view for explaining the procedure for using the puncture device shown in FIG. It is a side view which shows the operation state concerning the conventional puncture device. It is a perspective view which shows the modification of the conventional puncture device.

Hereinafter, a puncture device according to an embodiment of the present invention will be described with reference to FIGS. 1 to 14.
As shown in FIGS. 1 to 3, the puncture device 1 includes a catheter 2, an inner needle 3 into which the distal end portion is inserted into the catheter 2, and a cylinder that holds one end portion (base end portion) of the inner needle 3. And a protector 5 that covers the distal ends of the catheter 2 and the inner needle 3. Moreover, in the puncture device 1, all parts except the inner needle 3 are made of resin. 1 and 2, the catheter 2 and the inner needle 3 are covered with the protector 5 and cannot be seen.

  As shown in FIGS. 3 and 4, the catheter 2 includes an outer needle 21 formed of a flexible hollow tube and an outer needle hub 22 that holds a proximal end portion of the outer needle 21. The outer needle hub 22 is integrally formed with a pair of wings 22 </ b> A (projection parts) extending on both the left and right sides thereof. The pair of wings 22 </ b> A is used for fixing the wing 22 </ b> A to the patient's skin with an adhesive tape or the like and preventing the catheter 2 from being displaced.

As shown in FIGS. 4 and 5, the injection device 4 is attached to a tubular inner needle hub 41 and a proximal end (left end of the paper surface) of the inner needle hub 41 by press fitting, and a base of the inner needle 3 And a tail plug 42 having a substantially cylindrical needle holding portion 42a for holding the end portion.
The injection device 4 has an outer cylinder 6 attached to the inside of the inner needle hub 41 so as to be able to advance and retract, and four arms 71A for gripping the catheter 2, and can be advanced and retracted inside the outer cylinder 6. And an inner cylinder 7 attached thereto.
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 catheter 2 can be held by two or more arms.

The inner needle hub 41 is formed in a substantially cylindrical shape. As shown in FIGS. 4 to 7, the inner needle hub 41 has a cylindrical fitting with a diameter larger than the cylindrical diameter of the main body 41 a. A joint portion 41b is formed. The fitting portion 41 b is configured to be fitted with the protector 5.
An opening 41c into which the tail plug 42 is fitted is provided at the rear end portion of the inner needle hub 41, and the shaft portion 64 of the outer cylinder 6 is provided on the main body 41a side of the cylindrical fitting portion 41b. A through hole 41d through which is inserted is provided. The outer cylinder 6 is configured to be accommodated in the main body portion 41 a and the fitting portion 41 b of the inner needle hub 41.

  A plurality of rib-shaped protrusions 41e having an arc shape (arc shape when viewed from the tip side) in the circumferential direction are formed at the distal end portion of the outer peripheral surface of the fitting portion 41b (in the figure, four rib-shaped projections are formed). Is shown). The rib-like protrusion 41e attaches (fixes) the protector 5 to the injection tool 4 by engaging the locked protrusion 5e (see FIG. 11) formed on the protector 5.

Further, adjacent rib-shaped protrusions 41e among the rib-shaped protrusions 41e are formed at a predetermined interval t as shown in FIG.
That is, the four rib-like protrusions 41e are arranged symmetrically as viewed from the front end side of the inner needle hub 41 with the two rib-like protrusions 41e as a pair. And the space | interval t between the rib-shaped protrusions 41e arrange | positioned left-right symmetrically is formed in the predetermined dimension so that the to-be-guided parts 5h and 5i (refer FIG. 11) formed in the protector 5 may penetrate.

Further, behind the rib-like projection 41e formed on the outer peripheral surface of the fitting portion 41b (on the proximal end side of the inner needle from the rib-like projection 41e), the axis is parallel to the axis of the inner needle hub 41. A presser protrusion 41 fc extending in the direction is provided.
As shown in FIG. 6, the lower surface 41f1 of the pressing projection 41f is disposed on an extension line of the lower surface 41e1 of the upper rib-shaped projection 41e among the pair of rib-shaped projections 41e disposed symmetrically.
That is, the rib-like protrusion 41e and the pressing protrusion 41f are configured to securely hold the guided protrusions 5h and 5i formed on the protector 5.

As shown in FIG. 8, the outer cylinder 6 includes a groove portion 61 (formed along the advancing and retreating direction of the inner cylinder 7) formed in the shaft portion 64 along the axis of the outer cylinder 6, and the 4 The arm opening and closing part 62 that accommodates one 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. 8 (c), the groove 61 is formed to be symmetrical at two locations, the upper part and the lower part, on the peripheral surface of the outer cylinder 6.
As shown in FIG. 5, when the inner cylinder 7 is accommodated in the outer cylinder 6, the arm opening / closing section 62 closes the four arms 71 </ b> A and holds the catheter 2.
On the other hand, when the inner cylinder 7 is pulled out (advanced) from the outer cylinder 6, as shown in FIG. 14 (c), there is no restriction by the guide groove 62A (arm opening / closing part 62). Due to its own elastic force, the four arms 71A are opened and the catheter 2 is released.

  Thus, the four arms 71A and the arm opening / closing part 62 constitute a gripping means for gripping the catheter 2, and the four arms 71A are retracted into the arm opening / closing part 62. As shown in FIG. 5, when the catheter 2 is gripped and the four arms 71A are advanced from the arm opening / closing part 62, as shown in FIG. 2 is released.

As shown in FIG. 9, the inner cylinder 7 passes through a neck portion 71 including 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 protrusion 72A is 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 each of the groove portions 61 (see FIG. 5B). 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.

Further, as shown in FIG. 5, the upright piece 72 </ b> B is pushed out by the peripheral surface of the inner needle 3 by the inner needle 3 being inserted (accommodated) into the through-hole 73. 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 41d and 63 of the outer cylinder 6 are formed with engaging portions, and when extended, the engaging portions formed on the end portions 41d and 63 are formed. By being locked, they are configured not to be separated (separated) from each other.

  Further, as shown in FIGS. 10 to 12, the protector 5 forms a cylindrical portion 5a for housing the outer needle 21, and extends from the cylindrical portion 5a in the axial direction so as to form an upper surface and a side surface of the protector. A main body 5b having openings 5c1 and 5c2 on the opposite end and lower surface of the cylindrical portion.

  The cylindrical portion 5a is formed to protrude from the inner peripheral surface of the distal end portion of the protector 5, and the distal end of the inner needle 3 is located in the space 5a1 inside the cylindrical portion 5a, and the end portion 5a2 of the cylindrical portion 5a. Is configured to contact the outer needle hub 22.

  The opening 5c1 is an opening for inserting the protector 5 into the fitting portion 41b of the inner needle hub 41. The opening 5c2 is a blade 22A provided on the outer needle hub 22 when the protector 5 is mounted. It is provided to prevent interference.

Further, on the opposite end side of the cylindrical part 5a on the outer peripheral surface of the main body part, an arcuate (as viewed from the cylindrical part 5a side) rib-like frame 5d extending on the left and right sides of the main body part 5b is formed. Has been. The rib-like frame 5d is provided with an extending portion 5d1 extending from the left and right sides of the main body portion 5b toward the cylindrical portion 5a.
Further, the arc-shaped rib-shaped protrusion 5d has a predetermined height h (dimension) so that the user can remove the protector 5 by putting his / her finger on the protrusion 5d.
The rib-shaped protrusion 5d and the extending portion 5d1 of the rib-shaped protrusion 5d are provided on the main body 5b, whereby the mechanical strength of the protector 5 in which the openings 5c1 and 5c2 are formed is improved, and the protector 5 is deformed. Can be suppressed.

Further, on the inner peripheral surface of the protector 5, a locked projection 5 e is formed in the circumferential direction.
When the protector 5 is attached to the inner needle hub 41, the rib-like projection 41e formed on the outer peripheral surface of the fitting portion 41b of the inner needle hub 41 gets over the locking projection 5e, whereby the locking projection 5e of the protector 5 is obtained. Is locked to the rib-like protrusion 41e, and the protector 5 is configured to be fixed to the inner needle hub 41 (fitting portion 41a).

Further, contact portions 5 f and 5 g that are in pressure contact with the outer peripheral surface of the fitting portion 41 b of the inner needle hub 41 are provided on the inner peripheral surface of the protector 5.
The contact portions 5 f and 5 g 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 5f and 5g only need to be formed in plural, and the pressure contact force between the outer peripheral surface of the fitting portion 41b and the contact portions 5f and 5g is equal to the outer peripheral surface of the fitting portion 41b and the contact portions 5f and 5g. In consideration of the sliding resistance (pull-out force), the width, length, number, etc. of the contact portions are set.

By the way, when the appropriate sliding resistance (pulling force) is not set, for example, the outer peripheral surface of the fitting portion 41b of the inner needle hub 41 is in contact with the entire inner peripheral surface of the main body portion 5b, and the sliding resistance is If it is large, the moment the user applies force and removes the protector, there is a risk that the force will be applied and the inner needle may be stabbed against itself or another person, while the sliding resistance (pull-out force) is small. Sometimes, the protector 5 may fall off from the fitting portion 41b of the inner needle hub 41.
As described above, by providing the contact portions 5f and 5g on the inner peripheral surface of the protector 5 and appropriately setting the width, length, number, etc. of the contact portions, an appropriate sliding resistance force (pull-out force) can be obtained. And safety can be ensured.

Further, the inner peripheral surface of the protector 5 is a rib-like protrusion protruding from the inner peripheral surface of the protector 5 in parallel with the contact portions 5f and 5g (parallel to the axis along the axis of the main body 5). Guided portions 5h and 5i are provided.
When the protector 5 is mounted, the guided portions 5h and 5i are inserted between the pair of rib-shaped protrusions 41e and guided to the rib-shaped protrusion 41e. Therefore, the thickness dimensions of the guided portions 5h and 5i are formed to be smaller than the interval t between the pair of rib-like protrusions 41e.

The upper surfaces of the guided portions 5h and 5i inserted through the pair of rib-like projections 41e are in contact with the lower surface of the presser projection 41f provided on the fitting portion 41b of the inner needle hub 41 (see FIG. 7).
As described above, the guided portions 5h and 5i are held by the pair of rib-like protrusions 41e and the pressing protrusions 41f, so that the protector 5 can be prevented from rattling.

In particular, since the mechanical strength of the opening 5c2 side on the lower surface of the protector 5 is weak, when the protector 5 is attached to the fitting portion 41b of the inner needle hub 41, the protector 5 is inclined (deformed) toward the opening 5c2 side. There is a risk.
By pressing the guided portions 5h and 5i with the pressing protrusion 41f, the inclination (deformation) toward the opening of the protector 5 can be suppressed.

When such a protector 5 is mounted, as shown in FIG. 13, a pair of wings 22A is arranged in the opening 5c2 on the lower surface side of the protector 5, and the protector 5 is placed in the X direction (injection device 4 side). ) And the guided portions 5e and 5f are inserted between the pair of rib-like projections 41b, and the guided portions 5h and 5i are moved while being guided by the rib-like projections 41e. The contact portions 5f and 5g move while being pressed against the outer peripheral surface of the fitting portion 41b of the inner needle hub 41.
Then, the locked protrusion 5e of the protector 5 moves over the rib-shaped protrusion 41e formed on the outer peripheral surface of the fitting portion 41b of the inner needle hub 41, whereby the locked protrusion 5g of the protector 5 becomes the rib-shaped protrusion 41e. Locked, the protector 5 is fixed to the inner needle hub 41 (fitting portion 41a).

At this time, the upper surfaces of the guided portions 5h and 5i inserted between the pair of rib-like projections 41e are in contact with the lower surface of the presser protrusion 41f provided on the fitting portion 41b of the inner needle hub 41, and the guided portions 5h and 5i are held by the pair of rib-like protrusions 41e and the pressing protrusion 41f.
Further, the distal end of the inner needle 3 is positioned in the internal space 5 a 1 of the cylindrical portion 5 a formed in the protector 5, and the distal end portion 5 a 2 of the cylindrical portion 5 a abuts on the outer needle hub 22. As a result, the protector 5 is stably attached (fitted) to the inner needle hub 41.

When the protector is thus mounted, the forward movement of the outer needle hub 22 (catheter 2) is blocked by the cylindrical portion 5a, and the outer needle hub 22 (catheter 2) is moved rearward. The movement is blocked by the inner needle hub 41 (fitting portion 41b) fixed to the protector 5.
As a result, the catheter 2 is fixed and movement of the catheter 2 is prevented. Further, even when the outer needle hub 22 is provided with the blades 22A, the protector 5 can be securely attached without increasing the size, and the outer needle 21 and the outer needle 21 can be attached by the space portion 5a1 of the cylindrical portion 5a. The inner needle 3 protruding from the tip of the needle 21 can be accommodated and protected.

Further, when removing the protector 5 (when moving the protector 5 in the Y direction in FIG. 5), the user can easily remove the protector 5 with one hand by placing a finger on the rib-like frame 5d. Since the contact portions 5f and 5g do not contact the arm opening / closing portion 62 of the outer cylinder 6, even if the protector 5 moves, the arm opening / closing portion 62 of the outer cylinder 6 does not move in the Y direction. Stay in 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, 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 2 as described above, and the catheter 2 and the inner needle 3 are exposed as shown in FIG. Then, as shown in FIG. 14A, the catheter 2 and the inner needle 3 are punctured into a blood vessel (a patient's body 110).
Thereafter, in order to retain the catheter 2, the inner needle hub 41 is moved along the axial direction in a direction away from the catheter 2 (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 catheter 2 is indwelling, the inner needle hub 41 is separated from the catheter 2 along the axial direction (withdrawing operation in the direction of the arrow shown in FIG. 14A), The inner needle hub 41 moves along the axial direction, and the injection device 4 extends as a whole. At this time, the catheter 2 is held by the inner cylinder 7, and the inner cylinder 7 and the outer cylinder 6 are integrated by the upright piece 72B (see FIG. 14B).

  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. Then, by pulling out from the catheter 2, the extracted inner needle 3 is covered with the inner cylinder 7, the outer cylinder 6, and the inner needle hub 41.

  Further, the inner needle hub 41 is separated from the catheter 2 along the axial direction. Then, as shown in FIG. 14C, when the tip of the inner needle 3 passes through the upright piece 72B, the upright piece 72B is not subjected to force from the side surface of the inner needle 3, returns to the original state, and penetrates. The hole 73 is closed. 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 catheter 2 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.

Further, when the inner needle hub 41 is moved away from the catheter 2 along the axial direction, the outer tube 6 is moved, and the inner tube 7 is pulled out from the outer tube 6, FIG. 14 (c) shows. Thus, the four arms 71A are opened, and the holding state of the catheter 2 by the four arms 71A is released.
That is, when the inner needle hub 41 is separated from the catheter 2 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 cylinder. 6. When accommodated in the inner needle hub 41, the catheter 2 is released from the holding state of the catheter 2 by the four arms 71A and the arm opening / closing part 62.

As a result, while the catheter 2 is indwelled in the blood vessel, the inner needle 3 is pulled out from the catheter 2 and accommodated in the injection tool 4, and the catheter 2 is removed from the injection tool 4.
Thus, the puncture device 1 can accommodate the inner needle 3 in the injection device 4 only by pulling out the inner needle 3 from the catheter 2, and the catheter 2 can be accommodated in the injection device. 4 can be removed.

  In this embodiment, the case where the injection tool 4 is extended 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. For example, the inner needle hub and the outer cylinder Or a relay cylinder (not shown) between the outer cylinder and the inner cylinder, and the injection device 4 may be extended.

  In the present embodiment, the case where the gripping means is constituted by the four arms 71A and the arm opening / closing part 62 has been described as an example. However, the present invention is not particularly limited to this configuration. The gripping means is configured to extend the inner needle hub by separating the inner needle hub from the outer needle hub along the axial direction so that the inner needle pulled out from the outer needle hub is accommodated in the cylindrical body. The outer needle hub may be configured to be released.

DESCRIPTION OF SYMBOLS 1 Puncture tool 2 Catheter 3 Inner needle 4 Injection tool 5 Protector 5a Cylindrical part 5b Main-body part 5c1 Opening part (lower surface side)
5c2 opening (on the side opposite to the cylindrical part)
5d rib-like frame 5d1 rib-like frame extending portion 5e locked protrusion 5f contact portion 5g contact portion 5h guided portion 5i guided portion 6 outer cylinder (tubular body)
7 Inner cylinder (tubular body)
21 Outer needle 22 Outer needle hub 22A Wing (projection part)
41 inner needle hub 41a body portion 41b fitting portion 41c opening portion 41d through hole 41e rib-like projection 41f presser projection 42 tail plug 42a needle connecting portion 61 groove portion 62 arm opening / closing portion (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 (5)

An outer needle, an outer needle hub having a protruding portion on a side surface while holding a proximal end portion of the outer needle, an inner needle into which a distal end portion is inserted into the outer needle, and a proximal end portion of the inner needle A puncture device comprising a cylindrical inner needle hub and a protector that covers the outer needle,
The protector includes a cylindrical portion that houses the outer needle, a main body that extends in the axial direction from the cylindrical portion to form an upper surface and a side surface of the protector, and has an opening at the lower surface and the opposite end of the cylindrical portion. A rib-like frame formed on the outer peripheral surface of the main body portion on the opposite end side of the cylindrical portion, and a locked protrusion formed on the inner peripheral surface of the main body portion on the opposite end side of the cylindrical portion. Have
The inner needle hub has a rib-shaped protrusion that locks the locked protrusion formed on the outer peripheral surface on one end side,
The protrusion portion of the outer needle hub is disposed in the opening on the lower surface of the protector, and one end side of the inner needle hub is inserted from the opening on the opposite end side of the cylindrical portion of the protector, thereby allowing the body portion to be covered. A puncture device, wherein a locking protrusion is locked to a rib-shaped protrusion of the inner needle hub, and the outer needle is accommodated in the cylindrical portion.   The puncture device according to claim 1, wherein a height of the rib-shaped frame from the outer peripheral surface of the main body is formed such that a user's finger can be taken. The protector protrudes from the inner peripheral surface of the main body, and has a contact portion extending in parallel with the axis along the axis of the main body from the opening on the opposite end side of the cylindrical portion,
The said contact part press-contacts to the outer peripheral surface of an inner needle hub when the one end side of an inner needle hub is inserted from the opening part of the other end part side of the cylindrical part of the said protector, The Claim 1 or Claim 2 characterized by the above-mentioned. Puncture tool. The protector has a guided part that protrudes from the inner peripheral surface of the main body part and extends in parallel with the axis along the axis of the main body part from the opening on the opposite end side of the cylindrical part,
The rib-like projections are formed at a predetermined interval, and when the one end side of the inner needle hub is inserted from the opening on the opposite end side of the cylindrical portion of the protector, the guided portion is located between the rib-like projections. The puncture device according to claim 1, wherein the puncture device is guided by the rib-shaped protrusion.   5. The puncture device according to claim 4, wherein a pressing protrusion that contacts the guided portion is formed on an outer peripheral surface of the inner needle hub closer to the proximal end portion of the inner needle than the rib-shaped protrusion.

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