JPS6213025B2 - - Google Patents

Description

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to indwelling needles, particularly the structure of an inner needle hub 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 made by a flash 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 that flashes 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 and the small chamber escapes through the membrane filter, and the blood enters the small chamber. An indwelling needle with a structure that allows for flashback has been developed. In this structure, the inner needle hub is composed of a rectangular parallelepiped, and the hub is held by placing the first finger (thumb) and second finger (index finger) on the side surfaces 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. In order to do so, holding the hub as described above requires a very large force at the time of puncturing, 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. receive. Furthermore, Seldinger needles and indwelling needles consist of two or three components, including a catheter and an inner needle, or a dilator in addition to these components.When puncturing, the inner needle hub is held by hand, and the catheter and dilator are integrated with the inner needle. Hold the catheter hub and dilator hub at the same time so that they move together. 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, placed the second finger (index finger) and third finger (middle finger) on these flanges, and placed the first finger (thumb) on the end of the inner needle hub of the indwelling needle. If you hold it down, the placement of your fingers is 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 distal end, as described at the beginning, the inner needle and the air inside the small chamber will escape because the open part is pressed tightly with the pad of the new finger. The drawback was that it was impossible to check the flash pack to prevent blood from flowing into the chamber.

[Purpose of the invention]

Therefore, the present invention is an indwelling device that can be used in blood vessels that run relatively deep in tissues, and can reliably confirm flashbacks of body fluids such as blood even when insertion requires a large force. The present invention seeks to provide a structure for a needle, particularly an inner needle hub thereof.

[Specific 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 inside 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 a cutting edge is positioned, 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, and the inner needle hub is attached to the inner needle. It has a catheter pressing puncture surface on the end surface opposite to the 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 in the inner needle hub. An indwelling device which is provided at least on a surface other than the pressure puncture surface and is provided with a breathable blood-leakproof member 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. It provides needles.
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 can be provided on the outer peripheral side surface of the inner needle hub, or on the end surface in the cutting edge direction of the inner needle on the larger diameter side of the inner needle hub, which forms a stepped portion of different diameter with the inner needle fixing 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 preferred to provide a flange on the catheter hub 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. 1 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 hub 3, a small chamber 5 is defined by a filter 4 that allows air to pass through but not body fluid.
The fluid flows into the blood vessel (flashback), and puncture of the blood vessel is confirmed. The air in the inner needle 2 and the 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 puncturing a blood vessel running relatively deep in tissue with the conventional indwelling needle assembly 1, the open end 6 of the inner needle hub 3 is pressed with the thumb.
The above problem occurs because there is no gap for air to escape, and the air pressure between the filter 4 and the thumb increases. Therefore, in the present invention, even if the open end of the inner needle hub is operationally occluded, when blood flashes back during puncture of a blood vessel, the air in the inner needle and the small chamber of the inner needle hub escapes, but body fluids such as blood remain inside. Only air is allowed to escape through an air permeable anti-leakage member 11 which prevents leakage from the needle hub, and an opening 12 for releasing this air to the outside is provided in the inner needle hub 3 to allow flashback. Since the inner needle hub 3 is transparent or translucent, the flashed blood can be easily visually confirmed. The above-mentioned breathable blood leakage-proof member 11 can be composed of a filter or a slit-containing member. As the filter, a membrane filter or a sintered body made of a polyester resin aggregate coated with polyvinyl chloride 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 and blood leakage resistance, and the size of the gap between the slits to maintain blood leakage resistance is preferably 0.1 to 20 μm.

In the example shown in FIG. 2, a breathable anti-leakage member 11 such as a filter or a slit member that allows air to pass through the passage 7 in the inner needle hub 3 but not body fluids.
A small chamber 5 for checking the flashback is defined by the inner needle hub 3 which forms a stepped portion with a different diameter, in this case, the smaller diameter on the side where the inner needle is fixed. An opening 12 is provided in the end surface on the large diameter side of the cutting edge. 2b, which is a cross-sectional view taken along the - line in FIG. 2a;
As shown in the figure, the opening 12 may be formed in at least a portion of the end surface of the inner needle hub.

In the example shown in FIG. 3, a small chamber 5 for checking flashback is defined in the passage 7 in the inner needle hub 3 by the above-mentioned air-permeable blood leakage-proof member, and the small chamber 5 is defined in the passage 7 in the inner needle hub 3 for checking the flashback. In this configuration example, an opening 12 in the shape of a hole passing through the outer circumferential surface of the inner needle hub 3 in the radial direction is formed downstream. As shown in FIG. 3B, which is a sectional view taken along the line - 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 opening 12 shown in FIG.
This position is provided in the shape of a groove on the downstream end surface of the inner needle hub 3 opposite to the inner needle fixing surface, that is, at the position of the catheter pressing and puncturing surface. As shown in FIG. 4b, which is a sectional view taken along the line - in FIG. 4a, 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.

An example of the structure of the indwelling needle 10 of the present invention shown in FIG.
The air-permeable blood-leak-proofing member 11 and the opening 12 are installed at substantially the same position, that is, the air-permeable blood-leakage-proofing member 11 is installed in the opening 12 of the passage 7 formed in the inner needle hub 3.
is installed, and the end of the inner needle hub 3 is closed. 5b, which is a sectional view taken along the - line in FIG. 5a;
As shown in the figure, the opening 12 may be provided in a part of the outer periphery of the inner needle hub 3, and
1 can also be provided within the opening 12 with an appropriate thickness.

Further, as stated at the beginning of the specification, the indwelling needle 10 of the present invention is used with a catheter 20 having a catheter hub 13. These relationships are shown in FIG. 6 in cross section of only the upper half. Catheter 20 is a trocar with a catheter hub 13 at one end.
is connected in fluid communication with the catheter lumen. The inner needle 2 of the indwelling needle 10 is connected to the outer catheter 2
0, and the indwelling needle 10 is inserted into the catheter hub 13.
When the catheter 20 is attached, the blade surface 16 at the tip of the inner needle 2 protrudes from the tip of the catheter 20.

From the viewpoint of safety and hygiene, a protector 14 is attached to surround the catheter 20 into which the inner needle 2 is inserted. In use, remove the protector 14, place your second finger (index finger) and third finger (middle finger) on the flange 15, and place your first finger (thumb) on the open end 6 of the inner needle hub 3 of the indwelling needle 10 of the present invention. Press it against the needle and insert it into the tissue to puncture the blood vessel. Even if the open end 6 is occluded by the thumb, air can escape from the opening described in the above configuration example, so that flashback can be reliably confirmed at the time of blood vessel puncture. 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 finger to prevent blood leakage, and then withdraw all the inner needle. Thereafter, the angiography catheter is introduced into a catheter placed in a blood vessel, or a syringe is connected to a catheter hub.

The tapered blade surface 16 of the inner needle 2 is used to puncture blood vessels deep in tissue, especially elastic arteries.
It is preferable that it always face in a certain direction.
For this reason, a protrusion 17 is provided on the inner needle hub 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. Preferably, the inner needle hub 3 is provided with a locking ridge 17 and the catheter hub is provided with a complementary groove 18, as shown in FIGS. 6 and 7. 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. When a blood vessel is punctured with the open end 6 occluded by the thumb, blood flows through the inner needle 2 and into the passage 7 of the inner needle hub as indicated by the solid arrow by the breathable anti-leakage member 11. The water flows into the small chamber 5 defined by. At that time, the air existing in the inner needle 2 and the small chamber 5 is pushed out by the inflow of blood, and as shown by the dotted arrow, it passes from the breathable blood-leakproof member 11 through the space 19 of the inner needle hub inner passage 7 to the opening 12. Exhausted to the outside (atmosphere). Therefore, the air existing in the inner needle 2 and the chamber 5 does not interfere with the flashback of blood, and since the hub 3 is transparent, the blood flowing into the chamber 5 can be seen, and the inner needle 2 does not penetrate into the tissue. It can be confirmed that a certain blood vessel is definitely captured.

[Specific effects of the invention]

The present invention provides that the inner needle hub has a catheter pressing and puncturing surface on the end surface opposite to the inner needle fixing portion, and has a passage communicating between the hollow part of the inner needle and the atmosphere, and the passageway communicates with the atmosphere. an opening in the inner needle hub at least on a surface other than the press-puncture surface, and a breathable blood-leakage-proof member is provided in the passageway, 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 flow from the inside of 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 smoothly discharged from the opening, and blood flashback is not obstructed. In addition, the inner needle hub is transparent or translucent, making it easy to see the blood flowing into the passageway and confirm that the inner needle, or catheter on the outside, is reliably covering the blood vessels in the tissue. can do. 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 hub, puncturing becomes extremely easy. Pressing the open end 6 with your thumb is used when a relatively large force is required, that is, when it is necessary to capture a blood vessel running relatively deep in the tissue, especially an artery, and the conventional method is used. Operational problems can be solved by 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 blood vessel damage, the orientation of the blade surface within the blood vessel can also be easily confirmed.

[Brief explanation of the drawing]

1a and 1b are a partial cross-sectional view and a cross-sectional view taken along the line -2 of a conventional indwelling needle, FIGS. 2a and 2b are a partial cross-sectional view and a cross-sectional view taken along the line -2 of a first configuration example of the indwelling needle according to the present invention, and FIG. Figures 4a and 4b are partial sectional views and sectional views taken along the line -, respectively, of the third configuration example, and Figures 5a and 5b are the same. 6 is a partially sectional side view of an example in which the indwelling needle of the present invention is applied to an angiography introduction needle, and FIG. 7 is a partial sectional view and a - line sectional view of four configuration examples, respectively. FIG. 8 is an enlarged partial sectional side view of the indwelling needle of the present invention, and FIG. 8 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... Passage, 10... Indwelling needle of the present invention, 11... Breathable blood leakage resistant member, 12... Opening, 13... Catheter hub, 14... Protector, 15... Flange , 16...blade surface, 17...
Projection, 18...groove, 19...space, 20...catheter.

Claims (1)

[Scope of Claims] 1. A catheter, a catheter hub fixed to one end of the catheter and having a hollow portion that communicates with the inside of the catheter, and a catheter that can be inserted into and removed from the catheter through the hollow portion of the catheter hub. It consists of an inner needle having a hollow part in which a cutting edge is positioned at the other end, 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, and the inner needle hub is , having a catheter pressing puncture surface on the end surface opposite to the inner needle fixing part, and having a passageway communicating between the hollow part of the inner needle and the atmosphere, and an opening of the passageway to the atmosphere. A breathable blood-leakproof member is provided in the needle hub at least on a surface other than the press-puncture surface and is provided in the passageway so that air can flow between the hollow portion of the inner needle and the atmosphere through the breathable blood-leakproof member. An indwelling needle characterized by: 2. The indwelling needle according to claim 1, wherein the air-permeable blood leakage-resistant member is constituted by a filter that allows air to pass through but not blood. 3. The indwelling needle according to claim 1, wherein the breathable blood-leakage-resistant 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. Claim 2, characterized in that 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 hub, which forms a stepped portion with a different diameter, with the inner needle fixing portion side having a smaller diameter.
3. The indwelling needle according to any one of Item 3, Item 3, and Item 4. 6. The indwelling needle according to any one of claims 2, 3, and 4, wherein the opening is provided on the outer circumferential side of the inner needle hub. 7. According to any one of claims 1 to 6, the inner needle hub and the catheter hub are provided with a fitting part that fixes the direction of the blade surface of the inner needle with respect to the catheter hub. Indwelling needle as described.