JPS5832774A - Staying needle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to an indwelling needle, particularly to the structure of an inner needle of an arterial indwelling needle.

(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 an indwelling needle, confirmation that the tip of the inner needle is present within the blood vessel is performed using a flush bag in which blood flows into the inner needle hub through the inner hole of the inner needle due to blood pressure. If the end of the inner needle hub is open, blood flashing back through the inner needle will leak out, which is undesirable. For this reason,
A small chamber that communicates with the inner needle is defined inside the inner needle hub by a membrane filter that allows air to pass through but not blood. During puncture, the air in the inner needle clasp and the small chamber escapes through the membrane filter, and the air inside the small chamber is released. An indwelling needle with a structure that allows blood flashback has been developed. In this structure, the inner needle hub is made up of a rectangular parallelepiped, and the hub is held by placing the first finger (C thumb) and the second finger (index finger) on the sides of the inner needle hub that are parallel to the inner needle and facing each other. This is a type of blood vessel puncture operation, and is suitable for searching for blood vessels running in relatively shallow parts of tissue, such as veins, but is suitable for searching for blood vessels running in relatively deep parts of tissue, such as arteries. The above-mentioned clamping method requires a very large amount of force during puncture, making it difficult to puncture the blood vessel accurately. For example, this applies to puncturing a Seldinger needle used when inserting an angiography catheter into an artery or an indwelling needle used to secure an artery.In such cases, large resistance due to the elasticity or tissue of the artery receive.

Furthermore, Seldinger needles and indwelling needles consist of two or three members, including a catheter and an inner needle, or a dilator. Hold the catheter hub and dilator hub together so that they move as one. As mentioned above, it is difficult to puncture these nopu by holding the opposite side of the nopu between the first finger (thumb) and second finger (index finger) from the side, as it requires a large amount of force. As mentioned above.

Therefore, two flanges are provided on the catheter hub, and the second finger (index finger) and the third finger (middle finger) are attached to these seven flanges.
If you place your first finger (M finger) on the end of the inner needle nose of the indwelling needle and hold it in place, the placement of your fingers will be the same as when using a syringe, making puncturing relatively easy. However, if this method uses an inner needle hub that is open only at the end, as described above, the inner needle and the inside of the small chamber will be squeezed tightly with the pad of the thumb. The drawback was that air could not escape and blood could not flow into the chamber, making it impossible to confirm the flash.

[Purpose of the invention]

Therefore, the present invention is intended to be used in blood vessels running relatively deep in the tissue, and to ensure that flashback of body fluids such as blood is confirmed even when insertion requires a large force. The purpose of this invention is to provide a structure for an indwelling needle, especially the inner needle, that allows for

[Detailed description of the invention]

The present invention provides a catheter, a catheter hub having a hollow portion fixed to one end of the catheter and communicating with the interior of the catheter, and the other end of the catheter being insertable and detachable into the catheter through the hollow portion of the catheter hub. It consists of an inner needle having a hollow part in which the cutting edge is positioned, and a transparent or translucent inner needle that can be fitted into the catheter hub and is fixed to the base of the inner needle.
- The inner needle has a surface for suppressing and puncturing the catheter on the end surface opposite to the inner needle fixing part, and has a passage communicating between the hollow part of the inner needle and the atmosphere, and an opening of the passage to the atmosphere. is located on at least a surface other than the lunar surface of the suppressive puncture, and a breathable leakage-proofing member is provided in the passageway so that air can flow through the hollow portion of the inner needle and the atmosphere through the breathable leakage-proofing member. The air-permeable, leakage-resistant member that provides the needle 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 can be provided on the outer circumferential side of the inner needle hub, or on the end face in the cutting edge direction of the inner needle on the larger diameter side of the inner needle, which forms a stepped portion of different diameters with the inner needle fixed side having a smaller diameter. In order to fix the direction of the blade surface of the inner needle relative to the catheter hub, it is preferable to provide a fitting portion on the inner needle hub and the catheter hub.

It is also preferable to provide the catheter with a flange for finger support during insertion.

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

FIG. M1 shows a conventional indwelling needle assembly 1 in partial cross section. As shown in FIG. 1a, the indwelling needle assembly 1 includes a puncture needle 2 and an inner needle hub 3 made of a transparent material, and the cross section of the inner needle hub 3 has an external shape as shown in FIG. 1b. is a square. ... Inside the chamber 3: 11 is a small chamber 5 with a filter 4 that allows air to pass through but not body fluids.
is defined, and when the collapsing tube is punctured by holding the opposing sides of the rectangular parallelepiped hub, blood flows into the chamber 5 through the inner needle 2 (flashback), confirming the puncture of the auxiliary tube. Air within the inner needle 2 and chamber 5 then escapes from the open end 6 of the hub 3 via the filter 4, allowing blood to flash back. However, as described above, this type of conventional indwelling needle assembly has had operational problems.

Several typical configuration examples of the indwelling needle 10 of the present invention that can solve the problems of the conventional ones will be described. When using the conventional indwelling needle assembly 1 to puncture a collapsing tube that runs relatively deep in the tissue, the open end 6 of the inner needle hub 3 is pressed with the thumb, so there is no gap for air to escape, and the filter 4 and The problem arises because the air pressure between the thumb and the thumb increases. Therefore, in the present invention, even if the open end of the inner needle hub is operationally occluded, when blood floods back during puncture of the tube, the air in the inner needle and the small chamber H of the inner needle hub escapes, but body fluids such as blood The inner needle...3 allows only air to escape through the breathable blood-leakproof member 11 that prevents it from leaking, and the opening 12 that releases this air to the outside is the inner needle...3.
to allow flashbacks. Since the inner needle hub 3 is transparent or semi-transparent, flashed back blood can be easily confirmed visually. The above-mentioned breathable blood leakage-proof member 11 can be constructed from a filter or a slit-containing member. As the filter, a membrane filter made of polyester resin aggregate coated with polyvinyl chloride, a sintered body, or the like may be used as appropriate. The slit-containing member is preferably made of a water-repellent material such as polypropylene in order to obtain ventilation resistance and blood leakage resistance, and the size of the slit gap to maintain leakage and collapse resistance is preferably 0.1 to 20 μm.

In the example shown in FIG. 2, a small chamber 5 for flashback confirmation is defined by an air-permeable blood-leakproof member 11 such as a filter or slit member that allows air to pass through the passage 7 in the inner needle hub 3 but not body fluids. In this case, the cutting edge on the larger diameter side of the inner needle, which forms a step part with a different diameter with the smaller diameter on the fixed side of the inner needle, is located downstream in the direction of air or blood flow during flashback. An opening 12 is provided on the side end surface.

As shown in FIG. 2b, which is a sectional view taken along the seal-summer line in FIG. 2a, the opening 12 may be formed in at least a part of the end surface of the inner needle hub. Here, a small chamber 5 for flashback confirmation is defined in the passage 7 in the inner needle hub 3 by the above-mentioned breathable blood leakage-proof member, and a small chamber 5 for confirming flashback is defined in the passage 7 in the inner needle hub 3. In the configuration example, the inner needle hub 3
An opening 12 in the shape of a hole that radially penetrates the outer peripheral side of the
was formed. As shown in FIG. 3b, which is a cross-sectional view taken along line I-1 in FIG. 3a, the opening 12 may be formed in at least a portion of the outer peripheral wall of the hub.

In the example shown in FIG. 4, the position of the opening 12 shown in FIG. 3 is set in the shape of a groove at the end surface of the inner needle hub 3 on the downstream side opposite to the inner needle fixing surface, that is, at the position of the catheter suppression and puncture surface. It was established. The fourth section is a cross-sectional view taken along the line ■-W in FIG. 4a.
As shown in Figure b, the opening 12 may be formed in at least a portion of the outer circumferential wall at the distal end of the inner needle hub.

In the configuration example of the indwelling needle 10 of the present invention shown in FIG. A breathable anti-leakage member 11 is installed in the opening 12, and the end of the inner needle hub 3 is closed. V- in Figure 5a
As shown in FIG. 5b, which is a cross-sectional view taken along the V line, the opening 12 may be provided in a part of the outer periphery of the inner needle hub 3, and the breathable blood leakage-proof member 11 may also be provided within the opening 12 in a suitable manner. In addition, as stated at the beginning of the specification, the indwelling needle 1 of the present invention can be provided with a certain thickness.
0 is used with catheter 13.

These relationships are shown in FIG. 6 in cross section of only the upper half.

The indwelling needle 10 of the present invention is inserted into the outer catheter 13, and the protector 4 is attached thereon for safety and hygiene reasons. When using, remove protector 4 and attach flange 1.
5, and press the first finger (chopstick finger) against the open end 6 of the inner needle hub 3 of the indwelling needle 10 of the present invention. Even if the open end 6 that is inserted into the tube and punctures the blood vessel is occluded by the thumb, air can escape from the opening described in the above configuration example, so that flashback is reliably confirmed when puncturing the blood vessel.

After confirming the flashback, grasp the catheter hub and gently begin to withdraw the inner needle, press the skin near the puncture site with your fingers to prevent fluid leakage, and then withdraw all of the inner needle. Thereafter, it is used by introducing an angiography catheter into a catheter placed in a restraining tube, or by connecting a syringe to a catheter hub.

In order to puncture blood vessels deep in tissue, particularly elastic arteries, it is preferable that the tapered blade surface 16 of the inner needle 2 always face in a fixed direction.

For this reason, a protrusion 17 is provided on the inner needle knob 3 of the indwelling needle 10 of the present invention as a means for aligning the members fitted to each other to prevent relative rotation. As shown in FIGS. 6 and 7, a locking protrusion 17 is provided on the inner needle hub 3,
Preferably, the catheter tube is provided with a complementary shaped groove 18. This prevents damage to the blood vessel during puncture due to rotation of the inner needle, and also allows easy confirmation of the orientation of the blade surface within the blood vessel.

The operation of the indwelling needle according to the present invention will be explained with reference to FIG. If the N++ tube is punctured with the open end 6 closed with the thumb, the collapsing fluid will pass through the inner needle 2 and into the passageway 7 of the inner needle hub as shown by the solid arrow in the breathable blood leakage-proof member 11.
The water flows into the small chamber 5 defined as necessary. At that time, the air existing in the inner needle 2 and the small chamber 5 is pushed out by the inflow of the liquid, and flows from the breathable blood-leakproof member 11 through the space 19 of the inner needle knob passageway 7, as shown by the dotted arrow. It is exhausted to the outside (atmosphere) through the opening 12. Therefore, since the hub 3 is transparent, the air existing in the inner needle 2 and the small chamber 5 does not interfere with the flashback of liquid passage, and the small chamber 5
The collapsing fluid flowing into the tissue can be seen, and it can be confirmed that the inner needle 2 is reliably capturing the blood vessel within the tissue.

[Specific effects of the invention]

The present invention provides that the inner needle knob has a surface for pressing and puncturing the catheter on the end surface opposite to the inner needle fixing portion, and has a passageway communicating between the hollow part of the inner needle and the atmosphere, and the atmosphere of the passageway. The opening to the inner needle is at least on a surface other than the suppressing puncture surface, and a breathable blood-leakage-proof member is provided in the passage, and the breathable blood-leakage-proof member connects the inside of the hollow portion of the inner needle to the atmosphere. Since the pressure puncture surface is provided with an open end, even if the open end is occluded with the thumb during catheter puncture, it will not flow from inside the inner needle and from the breathable blood leakage-proof member of the inner needle hub to the inner needle side. The air in the passage is easily discharged from the opening, and flashback during liquid passage is not hindered. In addition, since the inner needle hub is transparent or translucent, it is easy to see the collapsing liquid that has flowed into the passageway, and the inner needle, that is, the catheter on the outside, can reliably capture the blood vessels in the tissue. can be confirmed. Further, the breathable blood leakage-proof member can be configured as a membrane filter or a member with slits, and can be easily manufactured. Further, by providing a flange on the catheter, puncturing becomes extremely easy. If using the open end 6 by pressing it with your thumb requires relatively large force,
That is, when it is necessary to capture a blood vessel running relatively deep in the tissue, especially an artery, the conventional operational problems can be solved by using an indwelling needle with a simple structure.

Furthermore, as shown in FIGS. 6 and 7, the indwelling needle fitting alignment mechanism of the present invention allows the blade surface of the puncture needle to always be oriented in a fixed direction, which allows the puncture needle to be punctured as the inner needle rotates. In addition to preventing damage to the suppressor tube, the orientation of the blade surface inside the suppressor tube can also be easily confirmed.

[Brief explanation of the drawing]

Figures 1a and lb are a partial cross-sectional view and a cross-sectional view taken along the line I-1 of a conventional indwelling needle, respectively, and Figures 2a and 2b are a partial cross-sectional view and a cross-sectional view taken along the line I-1 of the first configuration example of the indwelling needle according to the present invention, respectively. Figures 3a and 3b are a partial sectional view and a sectional view taken along the line I-1 of the second configuration example, and Figures 4a and 4b are a partial sectional view and a sectional view taken along the line N-■ of the third configuration example, respectively. 5a and 5b are a partial cross-sectional view and a cross-sectional view taken along the line V-V of the fourth configuration example, and FIG. 6 is a partial cross-sectional side view of an example in which the indwelling needle of the present invention is applied to an angiography introduction needle. Figure 7 is an enlarged partial cross-sectional side view of the indwelling needle of the present invention applied to an angiography introduction needle;
The figure is a longitudinal sectional view for explaining the function of the indwelling needle of the present invention. Explanation of symbols 1... Conventional indwelling needle, 2... Inner needle, 3... Hub,
4... Filter, 5... Small chamber, 6... Open end, 7
... Passageway, 10... Indwelling needle of the present invention, 11... Breathable leakage-resistant member, 12... Opening, 13-- Catheter, 14-- Protector, 15-- 7-lunge, 16
...Blade surface, 17...Protrusion, 18...Groove Patent applicant Terumo Corporation 467

Claims (1)

[Scope of Claims] α) A catheter, a catheter hub having a hollow portion fixed to one end of the catheter and communicating with the inside of the catheter, and a catheter hub that can be inserted into and removed from the catheter through the hollow portion of the catheter hub, and The inner needle consists of an inner needle having a hollow portion with a cutting edge located at the other end of the catheter, and a transparent or translucent inner needle hub that can be fitted into the catheter hub and is fixed to the base of the inner needle.・・・
The inner needle has a surface for pressing and puncturing the catheter on the end surface opposite to the inner needle fixing part, and has a passage communicating between the hollow part of the inner needle and the atmosphere, and an opening of the passage to the atmosphere. A breathable blood-leakproof member is provided at least on a surface other than the pressure puncture lunar surface and is provided in the passageway so that the inside of the hollow portion of the inner needle and the atmosphere can flow through the breathable blood-leakproof member. Characteristic Indwelling Needle (0) The indwelling needle according to claim 1, wherein the breathable blood leakage-proof member is constituted by a filter that allows air to pass through but not indwelling fluid. (3) The indwelling needle according to claim 1, wherein the air-permeable blood leakage-proof member is a member with a slit that allows air to pass through but not blood to pass through. (4) The indwelling needle according to claim 1, wherein the catheter hub is provided with a flange for supporting with a finger during insertion. (5) The opening is provided on the end surface of the inner needle in the direction of the tip of the inner needle on the larger diameter side of the inner needle, which forms a stepped portion of different diameters with the inner needle fixing portion side having a smaller diameter. Indwelling needle 0 according to any one of claims 2, 3, and 4 (6) Claims 2 and 3, characterized in that the opening is provided on the outer peripheral side of the inner needle hub. Indwelling needles listed in either Section or Section 4. (7) Any one of claims 1 to 6, characterized in that the inner needle hub and the catheter hub are provided with a fitting portion that fixes the direction of the blade surface of the inner needle relative to the catheter hub. Indwelling needle described in Crab.