JPH0116190B2 - - Google Patents

Description

BACKGROUND OF THE INVENTION (Field of the Invention) The present invention relates to a puncture needle assembly in which an air vent plug for confirming blood flashback is detachably attached to the puncture needle so that the puncture needle can be applied to a syringe, etc. It is.

(Prior Art and its Problems) In angiography, etc., it is necessary to search for blood vessels within tissues and puncture them accurately. When puncturing a blood vessel with a puncture needle, confirmation that the tip of the puncture needle is inside the blood vessel is confirmed by visually observing the flashback of blood flowing through the inner hole of the puncture needle into the transparent or translucent puncture needle hub due to blood pressure. It is done by doing. If the end of the puncture needle hub is open, blood that flashes back through the puncture needle will leak out, which is undesirable. For this purpose, a small chamber that communicates with the inner hole of the puncture needle is defined between the removable air vent plug, which has an open end, and the puncture needle hub, and includes a membrane filter or the like that allows air to pass through but not blood. A puncture needle has been developed that allows air inside the puncture needle and chamber to escape through a membrane filter during puncture, allowing blood to flash back into the chamber. This structure is
The puncture needle hub is composed of a rectangular parallelepiped, and the first finger (thumb) and second finger (index finger) are placed on the sides of the puncture needle hub that are parallel to the puncture needle and face each other, and the hub is held between them to perform the blood vessel puncture operation. This method is suitable for searching for blood vessels that run relatively shallowly in tissue such as veins, but it is suitable for searching for blood vessels that run relatively deep in tissue such as arteries as described above. Since a very large force is required for puncturing when the hub is clamped, it is difficult to puncture the blood vessel accurately.
For example, this applies to the Seldinger needle used when inserting an angiography catheter into an artery, or the puncture needle used to secure an artery. receive resistance. Furthermore, Seldinger needles and puncture needles consist of two or three components, including a catheter and an inner needle or dilator.
When puncturing, hold the inner needle hub by hand, and hold the catheter hub and dilator hub at the same time so that the catheter and dilator move together with the inner needle. As mentioned above, it is difficult to puncture these hubs by holding the opposite side of the hub between the first finger (thumb) and second finger (index finger) from the side, as described above. That's right.

Therefore, we provided two flanges on the catheter hub, put the second finger (index finger) and third finger (middle finger) on these flanges, and attached the first finger to the end of the puncture needle hub.
If you hold it with your fingers (thumb) and hold it down, the placement of your fingers will be the same as when using a syringe, making puncturing relatively easy. However, if this method uses a hub with only the open end as described at the beginning, the puncture needle and the air in the chamber cannot escape because the open part is pressed tightly with the pad of the thumb. The drawback was that blood could not flow into the chamber and flashbacks could not be confirmed. Furthermore, since this type of puncture needle itself has a filter in its opening, other instruments such as syringes cannot be used, and other means have been used.

Purpose of the Invention Therefore, the present invention is applied to blood vessels that run relatively deep in the tissue, and enables blood flash back to be reliably confirmed even when insertion requires a large force. The present invention aims to provide a puncture needle assembly with a wide variety of features.

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a puncture needle having a through hole, a transparent or translucent puncture needle hub fixed to the side opposite to the cutting edge of the puncture needle, and a puncture needle hub that can be attached to and removed from the puncture needle hub in a fluid-tight manner. In the puncture needle assembly including an air vent plug, the air vent plug has a puncture pressing surface on the end surface opposite to the attachment part to the puncture needle hub, and when the air vent plug is attached to the puncture needle hub, the puncture needle is pressed. A passage communicating between the through hole and the atmosphere is formed,
The opening of this passage is located on a surface other than the puncture pressing surface of the air vent plug, and a breathable blood-leakproof member is disposed within this passage, and the puncture needle through-hole and the atmosphere are connected to each other through the breathable blood-leakproof member. A puncture needle assembly configured to communicate is provided. The present invention also provides
A puncture needle having a through hole, a transparent or translucent puncture needle hub fixed to the side opposite to the cutting edge of the puncture needle, an air vent plug that can be attached to and detached from the puncture needle hub in a liquid-tight manner, and the puncture needle In a catheter-equipped puncture needle assembly comprising an outer catheter having a through hole for insertion, and an outer catheter hub fixed to one end of the outer catheter and attachable to the puncture needle hub, the air vent plug is attached to the puncture needle hub. It has a pressing surface for puncturing on the end surface opposite to the attachment part,
When the air vent plug is attached to the puncture needle hub, a passage communicating between the puncture needle through hole and the atmosphere is formed, and an opening of the passage to the atmosphere is at least on a surface other than the puncture pressing surface. The present invention provides a puncture needle assembly with a catheter, in which a breathable blood leakage prevention member is disposed within the passage, and the through hole of the puncture needle is communicated with the atmosphere via the breathable blood leakage prevention member.

The breathable blood-leakage-proof member may be any material that allows air to pass through but not blood, and may be composed of a member provided with a filter or a slit, for example. The opening to the atmosphere of the passage communicating between the puncture needle penetration hole and the atmosphere is located on the outer peripheral side of the air vent plug.
Alternatively, the air vent plug can be provided on the end surface of the puncture needle tip side of the air vent plug, which forms a stepped portion with a different diameter, with the diameter on the side where the puncture needle hub is attached smaller.

Next, the puncture needle assembly of the present invention will be described in detail with reference to preferred embodiments shown in the accompanying drawings.

FIG. 1 shows a conventional puncture needle assembly 1 in partial cross section. The puncture needle assembly 1 includes a puncture needle 2, a puncture needle hub 3 fixed to the end opposite to the cutting edge, and a stopper or air vent plug 4 with a vent that can be attached to the hub in a liquid-tight manner. equip The puncture needle hub 3 has a circular cross section, and the tapered hole 5 of the puncture needle 2, which has a circular cross section, communicates with a through hole (not shown) of the puncture needle 3 on one side and a base 6 of the air vent plug 4 on the other end. The cylindrical protrusion 7 that protrudes further can be mounted in a liquid-tight manner. Base 6 and protrusion 7
A membrane filter 8 that allows air to pass through but not blood is attached near the boundary, and the distal end 9 of the base 6 is open. The end of the protrusion 7 is also open, and the air vent plug 4 is attached to the puncture needle hub 3 in the first place.
When attached as shown in the figure, the puncture needle hub 3, protrusion 7 and membrane filter 8 form a small chamber 1.
0 is limited. When a blood vessel is punctured by holding the opposing sides of the rectangular parallelepiped puncture needle hub 3, blood flows (flashback) into the small chamber 10 through the puncture needle 2, and the puncture of the blood vessel is confirmed. At this time, the air in the puncture needle 2 and the small chamber 10 escapes from the open end 9 of the base 6 of the air vent plug 4 through the filter 8, allowing blood to flash back. However, as described above, conventional puncture needle assemblies of this type have had operational problems.

Several typical configuration examples of the puncture needle assembly 20 of the present invention that can solve the problems of the conventional puncture needle assembly 20 will be described. When using the conventional puncture needle assembly 1 to puncture a blood vessel running relatively deep in tissue, the open end 9 of the air vent plug 4 is pressed with the thumb, so there is no gap for air to escape.
The above problem occurs because the air pressure between the filter 8 and the thumb increases. Therefore, in the present invention, even if the open end 9 of the base 6 of the air vent plug 4 is operationally occluded, when blood flashes back during puncture of a blood vessel, the air in the puncture needle 2 and the small chamber 10 escapes, but body fluids such as blood do not escape. A breathable blood leakage resistant member 21 that prevents leakage is disposed in the passage communicating between the through hole of the puncture needle 2 and the atmosphere to allow only air to escape, and an opening 22 for releasing this air to the outside is provided in the air vent plug 4. Provided to allow flashback. Since the puncture needle hub 3 is transparent or semi-transparent, the flashed blood can be easily visually confirmed. The above-mentioned breathable blood-leakproof member 21 may be any member that allows air to pass through but does not allow blood to pass through, and may be composed of a filter or a member with slits, for example. As a filter, a membrane filter or a sintered body made of polyester resin aggregate coated with polyvinyl chloride is inexpensive and has excellent blood leakage resistance and is practical. The member with slits is made of a water repellent material such as polypropylene in order to obtain ventilation and blood leakage resistance, and the size of the gap between the slits is set to maintain blood leakage resistance.
0.1 to 20 μm is suitable. When a member with slits is used, there is no need to provide a separate member to the air vent plug 4 like the filter described above, and the air vent plug 4 can be manufactured from the same material.

Next, a configuration example of the puncture needle assembly 20 according to the present invention will be described. Since the part whose structure changes in particular is the air vent plug 4, the configuration example of the air vent plug 4 will be described below. These are, of course, used by being attached to a puncture needle-hub assembly as shown in FIG. In addition, the puncture needle hub 3
It is desirable that the needle have a tapered hole 5 therein which communicates with the through hole of the puncture needle 2. This allows the inflow of blood to flow smoothly without being obstructed, and the adhesion of fibrin and blood clots due to hemolysis and coagulation is prevented. The puncture needle hub 3 may be a rectangular parallelepiped or may have another shape such as a cylindrical shape. Furthermore, a rib or the like may be appropriately provided on the outer circumferential surface of the puncture needle hub 3 to facilitate clamping during puncturing. Further, although the air vent plug 4 will be described as a cylindrical structure, it may have any shape as long as it can be attached to the puncture needle hub 3 in a liquid-tight manner. For example, it is preferable to form a pair of tapered shapes with the puncture needle hub 3. Note that a common configuration of the air vent plug 4 of the puncture needle assembly 20 of the present invention is that the end surface of the air vent plug 4 on the opposite side from the cutting edge is closed, unlike the conventional open type, and ), and the opening 22 for releasing air is provided downstream of the breathable blood leakage-resistant member 21 when viewed in the flow direction of blood or air during flashback. The opening 22 is provided at least on a surface other than the puncture pressing surface 23 so that air can easily escape even when the first finger (thumb) is placed on the puncture press surface 23. However, the pressing surface 23 for puncturing does not necessarily have to be closed, and may be an open surface as shown in FIG.
It is sufficient that the opening 22 is provided at a position that does not impede the flow of air accompanying flashback even when puncturing is performed by applying the needle.

In the example shown in FIG. 2, an opening 22 is located on the downstream side of the breathable blood leakage-proof member 21 provided near the boundary between the base 6 and the protruding portion 7 of the air vent plug 4 when viewed in the blood or air flow direction. is provided on the outer peripheral side surface of the base 6. Figure 2a -
As shown in Figure 2b, which is a cross-sectional view along the line,
The opening 22 may be formed in at least a portion of the outer peripheral side surface of the air vent plug 4. Although the base 6 is shown to have a separate shape from the protrusion 7 so that the end surface providing the puncturing pressing surface 23 has a sufficient area, when the opening 22 is provided on the outer peripheral side, the base 6 Of course, it is also possible to make it an extension of the protrusion 7. Note that in the configuration of FIG. 2, the pressing surface 23 can be opened as shown in FIG. 1.

In the example shown in FIG. 3, the base 6 of the air vent plug 4 has a larger diameter than the protrusion 7 and is formed between the two, downstream of the breathable blood-leakproof member 21 provided similarly to the example shown in FIG. An opening 22 is provided on the edge surface of the stepped portion having different diameters. Figure 3a -
As shown in FIG. 3b, which is a cross-sectional view taken along the line, the opening 22 may be formed in at least a portion of the end face of the stepped portion having different diameters. Note that in the configuration of FIG. 3, the pressing surface 23 can be opened as shown in FIG. 1.

In the example shown in FIG. 4, an opening 2
2 is formed from the outer circumferential side surface of the air vent plug 4 to the puncturing pressing end surface 23. During puncturing, the opening 22 formed in the end surface 23 is closed by the thumb, but the other parts remain open. The present invention also includes the case where an opening is provided at such a limit portion. Figure 4a -
As shown in Figure 4b, which is a cross-sectional view along the line,
The opening 22 may be formed in at least a portion of the end surface 23 and the outer peripheral wall of the air vent plug 4. Note that in the configuration of FIG. 4, the pressing surface 23 can be opened as shown in FIG. 1.

In the example shown in FIG. 5, the installation positions of the breathable blood leakage-proof member 21 and the opening 22 are substantially the same, that is, in the illustrated example, the opening 22 is formed in the outer peripheral side wall of the base 6 of the air vent plug 4. A breathable blood leakage-proof member 21 is disposed at the top of the body, and the present invention also includes such a configuration. As shown in FIG. 5b, which is a cross-sectional view taken along the - line in FIG. The anti-leakage member 21 can also be provided within the opening 22 with an appropriate thickness.

Specific Effects of the Invention Next, the effects of the puncture needle assembly of the present invention will be explained with reference to FIG. As shown in FIG. 6, with the air vent plug 4 attached to the puncture needle hub 3, place your first finger (thumb) on the end surface 23 of the air vent plug 4 (the end surface may be open in this configuration). When a blood vessel is punctured by holding the puncture needle hub 3 between the second finger (index finger) and the third finger (middle finger), blood flows through the puncture needle 2 into the small chamber 10 as shown by the solid arrow. Inflow. At that time, the air existing in the puncture needle 2 and the small chamber 10 is pushed out by the inflow of blood, and as shown by the dotted arrow, from the air-permeable blood leakage-proof member 21, through the space inside the base 6 of the air vent plug 4, and from the opening 22. Exhausted to the outside (atmosphere). Therefore, since the hub 3 is transparent, the blood flowing into the small chamber 10 can be seen without the air existing in the puncture needle 2 and the small chamber 10 interfering with the flashback of blood as in the conventional puncture needle 2 shown in FIG. This allows confirmation that the puncture needle 2 has reliably captured the blood vessel within the tissue.

The puncture needle assembly 20 of the present invention also includes an outer catheter 24 through which the puncture needle 2 can be inserted, and a catheter hub 25 that is fixed to one end of the outer catheter and can be attached to the puncture needle hub. It can also be used as a catheter-equipped puncture needle assembly by attaching it to the needle (see Fig. 7).

Both of the configuration examples shown in FIGS. 6 and 7 are basically assembled and used as shown in each figure. In the configuration example shown in FIG. 6, when performing selective angiography, after confirming the puncture of a blood vessel in the tissue using a flashback as described above, the air vent plug 4 is removed from the puncture needle hub 3, and the guide wire is removed. (not shown) is guided into the blood vessel through the puncture needle 2. When the tip of the guide wire reaches the inside of the blood vessel, the guide wire is kept as it is, and only the puncture needle 2 is pulled out while preventing blood leakage by, for example, pressing the vicinity of the skin puncture site with a finger. In this way, by using this type of guidewire, the guidewire can be introduced into the blood vessel with less bleeding.

When the external catheter is placed in a blood vessel, it is set as shown in FIG. 7 and then can be easily punctured into areas where resistance is large, such as tissue, as described above. Further, there are cases where a syringe is connected to the puncture needle hub 3 for puncturing, but in this case, it is possible to connect the syringe to the puncture needle hub 3 by removing the air vent plug 4 from the puncture needle hub 3.

Furthermore, if a large force is required during puncture, a flange 26 is provided on the catheter hub 25 to which a second finger (index finger) and a third finger (middle finger) can be applied, as shown in FIG. at least 1
If the air vent plug 4 having two vents 27 is attached to the puncture needle hub 3 and used, it is very convenient to operate. 8 is shown in a semi-assembled state, and the puncture needle 2 is shown retracted into the catheter 24, but in use, the puncture needle 2 protrudes slightly from the catheter 24 as shown in FIG. state.

Specific effects of the invention In the present invention, the end surface of the air vent plug opposite to the side where it is attached to the puncture needle hub is closed or opened to serve as a pressing surface for puncture, and the end surface of the air vent plug is provided in the air vent plug and the puncture needle On the downstream side of the air-permeable blood-leakage-resistant member that defines the small chamber for flashback confirmation together with the hub, as seen in the flow direction of blood or air during flashback, at least a surface other than the puncture needle pressing end surface of the air vent plug is provided with air leakage to the atmosphere. Since an opening is provided so that air can flow between the puncture needle's through hole and the atmosphere through the breathable blood leakage-resistant member, even if the end face of the air vent plug is pressed for puncturing, the puncture needle and the air inside the chamber will not flow through the opening. flashbacks are not prevented from escaping through . Since the puncture needle hub is transparent or translucent, it is easy to see the blood flowing in through the puncture needle, and it can be confirmed that the puncture needle is reliably capturing the blood vessel within the tissue. Further, the breathable blood leakage resistant member can be configured as a membrane filter or (sintered body), and has excellent blood leakage resistance, is practical, and can be easily produced. Furthermore, when the breathable blood leakage-proofing member is a member with slits, it is possible to manufacture an air vent plug without providing a separate member such as the filter. The air vent plug is used by pressing the end surface with the thumb when it is necessary to capture a blood vessel running relatively deep, especially an artery. This can be solved using solids.

When a catheter is to be indwelled in a blood vessel, it can be used with an external catheter attached, and the puncture needle assembly of the present invention has a wide variety of uses. In addition, when the opening is provided on the outer circumferential side of the air vent plug, and when it is provided on the end surface of the air vent plug on the puncture needle tip side, which forms a stepped portion of a different diameter with a smaller diameter on the side where it is attached to the puncture needle hub. As shown in Figure 9, even if the end face of the air vent plug, that is, the pressing surface for puncturing, is opened, even if this end face is pressed for puncturing, it is extremely unlikely that the opening will be clogged, and blood will not flash back. The accompanying puncture needle and the air in the small chamber can be reliably released, flashback is not obstructed, and the opening can be easily formed.

[Brief explanation of drawings]

FIG. 1 is a partial cross-sectional view of a conventional puncture needle assembly, FIGS. 2a and 2b are a cross-sectional view and a cross-sectional view taken along the line 3 and 3, respectively, of a first configuration example of an air vent plug of the puncture needle assembly of the present invention. The figure is the same number 2
A sectional view and a - line sectional view of each configuration example,
4a and 4b are a cross-sectional view and a cross-sectional view taken along the line -, respectively, of the third configuration example, FIGS. 5a and 5b are a cross-sectional view and a line cross-sectional view, respectively, of the fourth configuration example, and FIG. 6 is a puncture according to the present invention. FIG. 7 is a side view showing another usage example of the puncture needle assembly with catheter of the present invention, and FIG. 8 is a longitudinal cross-sectional view for explaining the operation of the needle assembly. FIG. 9 is a perspective view showing an example of use of the air vent, and FIG. 9 is a side sectional view of a configuration example in which the pressing surface of the air vent is open. Explanation of symbols, 1... Conventional puncture needle assembly, 2...
... Puncture needle, 3 ... Puncture needle hub, 4 ... Air vent plug, 5 ... Tapered hole, 6 ... Base, 7 ... Protrusion, 8 ... Membrane filter, 9 ... Open end, 10 ... Small chamber , 20... puncture needle assembly of the present invention, 21... breathable blood leakage resistant member, 22... opening, 23... puncture pressure surface, 24... outer catheter, 25... catheter hub, 26... Flange, 27... vent.

Claims (1)

[Scope of Claims] 1. A puncture needle having a through hole, a transparent or translucent puncture needle hub fixed to the side opposite to the cutting edge of the puncture needle, and a puncture needle hub that is removably attachable to the puncture needle hub in a fluid-tight manner. A puncture needle assembly including an air vent plug that can be attached, the puncture needle assembly having a puncturing pressing surface on an end surface opposite to a mounting portion of the puncture needle hub that includes the air vent plug, and When attached to the puncture needle hub, a passage communicating between the through hole of the puncture needle and the atmosphere is formed,
The opening of the passageway to the atmosphere is at least on a surface other than the puncture pressing surface, and a breathable blood leakage-proof member is disposed within the passageway, and the through-hole of the puncture needle and the atmosphere are connected to the breathable blood-leakageproof member. A puncture needle assembly characterized in that it is configured to communicate through a member. 2. The puncture needle assembly according to claim 1, wherein the breathable blood-leakage-proof member is constituted by a filter that allows air to pass through but not blood. 3. The puncture needle assembly according to claim 1, wherein the breathable blood-leakage-proof member is a member with a slit that allows air to pass through but not blood. 4. The puncture needle assembly according to claim 2 or 3, wherein the opening of the passageway to the atmosphere is provided on the outer circumferential side of the air vent plug. 5. The opening of the passageway to the atmosphere is provided on the end surface of the air vent plug on the puncture needle tip side, which forms a stepped portion with a different diameter, with the diameter smaller on the side where it is attached to the puncture needle hub. Puncture needle assembly according to item 2 or 3. 6 A puncture needle having a through hole, a transparent or translucent puncture needle hub fixed to the side opposite to the cutting edge of the puncture needle, an air vent plug that can be attached to and detached from the puncture needle hub in a fluid-tight manner, and the puncture needle. In the puncture needle assembly with a catheter, the air vent plug includes an outer catheter having a through hole through which the puncture needle is inserted, and an outer catheter hub that is fixed to one end of the outer catheter and is attachable to the puncture needle hub. having a puncturing pressing surface on an end surface opposite to the attachment part to the hub, and when the air vent plug is attached to the puncturing needle hub, a passage communicating between the through hole of the puncturing needle and the atmosphere is formed; The opening of the passageway to the atmosphere is at least on a surface other than the puncture pressing surface, and a breathable blood leakage-proof member is disposed within the passageway, and the through-hole of the puncture needle and the atmosphere are connected to the breathable blood-leakageproof member. A puncture needle assembly with a catheter, characterized in that it is configured to communicate through a member. 7. The catheter-equipped puncture needle assembly according to claim 6, wherein the air-permeable blood leakage-proof member is constituted by a filter that allows air to pass through but not blood. 8. The catheter-equipped puncture needle assembly according to claim 6, wherein the breathable blood-leakproof member is a member with a slit that allows air to pass through but not blood to pass through. 9. The catheter-equipped puncture needle assembly according to claim 7 or 8, wherein the opening of the passageway to the atmosphere is provided on the outer circumferential side of the air vent plug. 10. The opening of the passageway to the atmosphere is provided on the end surface of the air vent plug on the puncture needle tip side, which forms a stepped portion of a different diameter with a smaller diameter on the side where the puncture needle hub is attached. Puncture needle assembly with catheter according to item 7 or item 8.