JP5108580B2 - Indwelling needle - Google Patents

Description

  The present invention relates to an indwelling needle, particularly an indwelling needle used for indwelling a central venous catheter, and relates to the structure of the indwelling needle.

  Infusion for a patient is performed by puncturing an indwelling needle connected to an infusion line into a blood vessel of the patient and indwelling an outer needle portion of the indwelling needle. Here, whether or not the indwelling needle has secured a blood vessel is confirmed by visual observation that blood flows into a transparent base portion mounted on the proximal end side of the indwelling needle (referred to as “flashback”).

  Specifically, the indwelling needle is composed of a hollow inner needle and a hollow outer needle. When puncturing a patient's blood vessel, a puncture operation is performed with a hollow inner needle having a sharp needle tip inserted into the lumen of the outer needle and the needle tip protruding from the tip of the outer needle. . Here, when the inner needle reaches the inside of the blood vessel, the blood flowing in from the opening of the needle tip passes through the lumen of the inner needle and flows into the transparent inner needle base portion mounted on the proximal end side of the inner needle. Thereby, the blood vessel securing of the inner needle can be confirmed.

  Then, by further advancing the inner needle and the outer needle little by little, the tip of the outer needle reaches the blood vessel. In this case, the blood vessel of the outer needle is visually recognized through the groove formed in the longitudinal direction on the outer peripheral surface of the needle tip of the inner needle and flowing into the lumen of the outer needle and the base of the outer needle. Ensuring is confirmed (Cited document 1).

Japanese Patent Publication No. 6-93917

  However, in order to flash back blood, it is necessary to increase the pressure in the blood vessel. For blood vessels close to the skin, the blood vessels can be tightened with a tourniquet to increase the pressure in the blood vessels, while the central venous catheter must be placed in a deep blood vessel and is the target. Since the blood vessel is deep, it is difficult to apply pressure by the tourniquet.

In such a case, for securing the blood vessel of the inner needle, a method of reliably performing flashback can be applied by providing a syringe on the inner needle and pulling it to apply a negative pressure inside the base of the inner needle.
However, in order to secure the blood vessel of the outer needle, it is difficult to make a negative pressure inside the base portion of the outer needle with a syringe.

  In particular, when a patient with cardiopulmonary arrest or an urgent blood vessel is secured, the blood pressure of the blood vessel of the patient or the like is weak, so that flashback is not sufficient, and there is a possibility that the securement of the blood vessel of the outer needle cannot be confirmed visually.

  In view of the above circumstances, an object of the present invention is to provide an indwelling needle that solves the above-described problem and can reliably recognize that the outer needle has secured a blood vessel.

  In order to solve the problem, an indwelling needle according to a first aspect of the present invention includes an outer needle, an outer needle base portion that holds the outer needle, an inner needle that is inserted into the outer needle, and the inner needle. An indwelling needle having an inner needle base that holds a blood inflow portion for allowing blood to flow between the outer needle and the inner needle, and the inner needle base is fitted to the outer needle base. The protrusion has a connecting hole, and the protrusion has a communication hole for communicating the inside of the outer needle base with the inside of the inner needle base.

  According to the said structure, since the outer needle base and the inner needle base are fitted by the protrusion part formed in the inner needle base, airtightness is maintained inside the outer needle base. Then, if the inside of the inner needle base is made negative pressure with a syringe or the like, the inside of the outer needle base communicating with the inside of the inner needle base through the communication hole also becomes negative pressure, and blood passes through the blood inflow portion to the outer needle. It is sucked in and flows in. Therefore, the flashback can be visually recognized with certainty.

  The invention according to claim 2 is the indwelling needle according to claim 1, wherein the blood inflow portion is a groove formed along the longitudinal direction of the outer peripheral surface of the inner needle. To do.

  According to the said structure, since the groove part is formed along the longitudinal direction of the outer peripheral surface of an inner needle, it becomes possible for blood to flow into the outer needle which penetrates an inner needle inside. Therefore, the flashback can be visually recognized with certainty.

  The invention according to claim 3 is the indwelling needle according to claim 1 or 2, wherein the projecting portion includes an inner tube through which the inner needle is inserted and an outer tube fitted into the outer needle base. And a support column that supports the inner tube and the outer tube, and the communication hole is formed by the inner tube, the outer tube, and the support column.

  According to the above configuration, since the projecting portion has the outer tube fitted to the outer needle base and the inner tube supported by the support and through which the inner needle is inserted, if the inner needle base is made negative pressure, The inner needle has a negative pressure through the tube, and the inside of the outer needle base portion into which the outer tube is fitted through the communication hole can be set to a negative pressure. Therefore, the flashback can be visually recognized with certainty.

  According to the invention, it is possible to provide an indwelling needle that can reliably recognize that the outer needle has secured the blood vessel.

Next, the indwelling needle 1 which concerns on one Embodiment of this invention is demonstrated using FIGS. FIG. 1 is an overall side view showing a puncture device 100 in which a syringe 10 is attached to an indwelling needle 1 according to this embodiment. FIG. 2 is an enlarged side sectional view showing a section of the indwelling needle 1 shown in FIG. FIG. 3 is a cross-sectional view of the puncture device shown in FIG. 1 cut along the line AA. FIG. 4 is a diagram showing a method of using the puncture device 100 shown in FIG.
In the following description, the left side in FIGS. 1 and 2 is referred to as the “front end side”, and the right side is referred to as the “base end side”, and the same applies to other drawings.

  A puncture device 100 shown in FIG. 1 includes an indwelling needle 1 and a syringe 10. Specifically, the indwelling needle 1 includes an outer needle 2 that is punctured and indwelled in a blood vessel, an outer needle base 3 that includes the outer needle 2 on the distal end side, and a distal end needle tip that passes through the outer needle 2. The inner needle 4 protrudes from the outer needle 2 and the inner needle 4 is provided with an inner needle base portion 5 having a distal end side. Moreover, the syringe 10 is for making the inner needle base space 52 mentioned later into a negative pressure, and the front-end | tip of the syringe 10 is inserted and fitted to the opening location of the base end side of an inner needle base.

  FIG. 2 is a cross-sectional view of the indwelling needle 1, but the outer needle 2 has a substantially cylindrical shape and the inner diameter thereof is larger than the outer diameter of the inner needle 4. As a result, a gap 21 serving as a blood flow path is formed. On the other hand, the inner diameter on the distal end side of the outer needle 2 is substantially the same as or slightly smaller than the outer diameter of the inner needle 4, and when the inner needle 4 is inserted into the lumen of the outer needle 2, The inner peripheral surface on the distal end side of the needle 2 is in close contact with the outer peripheral surface of the inner needle 4.

  Further, the outer diameter of the outer needle 2 is a tapered shape that gradually decreases toward the distal end side, thereby facilitating the puncturing operation of the outer needle 2.

  Since the outer needle 2 is flexible and it is preferable that all or part of the outer needle 2 is visible, the material of the outer needle 2 is ethylene-tetrafluoroethylene, polyurethane, polyether nylon. Examples include, but are not limited to, resins. The reason why all or part of the outer needle 2 is visible is that it is possible to visually recognize that blood has flowed into the outer needle 2.

  The outer needle base 3 is formed with a through hole 31 on the distal end side and an outer needle base opening 32 on the proximal end side. A groove for inserting and fitting the proximal end side of the outer needle 2 is formed on the distal end side end surface of the through-hole portion 31, and the proximal end side of the outer needle 2 is fixed by an adhesive or the like. The outer needle base opening 32 is formed by forming the base end side of the outer needle base 3 in a concave shape. Here, as shown in FIG. 2, the outer needle base portion 3 has a shape in which two cylinders having different diameters are connected by a taper, and an internal space other than the through-hole portion 31 becomes an outer needle base space 33. .

  The constituent material of the outer needle base 3 is a transparent or translucent resin for confirming that blood has flowed into the outer needle base space 33. Specifically, examples thereof include polyolefins such as polyethylene, polypropylene, and ethylene-vinyl acetate copolymer, polyvinyl chloride, polymethyl methacrylate, polycarbonate, polybutadiene, polyamide, and polyester, but are not limited thereto.

  The inner needle 4 has a substantially cylindrical shape, and is composed of a hollow needle in which a sharp needle tip 41 for puncturing the skin is formed on the distal end side. The length of the inner needle 4 should just be a length which protrudes from the end surface at the front end side of the outer needle 2 in the assembled state. The outer diameter of the inner needle 4 is not particularly limited as long as it can be inserted into the outer needle, but is usually about 0.2 to 4.5 mm, more preferably about 0.3 to 3.0 mm.

  In the longitudinal direction of the outer peripheral surface of the tip of the inner needle 4, a groove portion 42 that is a blood inflow portion is formed. The length of the groove portion 42 is such a length that the groove portion 42 formed from the tip of the inner needle 4 communicates with the gap portion 21 in the longitudinal direction of the inner needle 4. The material of the inner needle 4 is preferably a metal such as stainless steel, aluminum, aluminum alloy, titanium, or titanium alloy, but is not limited thereto.

  The inner needle base portion 5 includes a protruding portion 51 that protrudes toward the distal end side, and an inner needle base space 52 that is made negative pressure by the syringe 100. The inner needle base 5 is preferably made of a translucent or transparent resin so that the inner needle base inner space 52 can be visually recognized, and the same material as the outer needle base 3 can be used. The material of the base 3 and the inner needle base 5 need not be the same.

  As shown in FIG. 3, the protrusion 51 includes an inner tube 55 that forms a protrusion opening 53 through which the inner needle 4 is inserted, an outer tube 56 that fits into the outer needle base opening 32, and an inner tube 55. There are four support columns 57 provided at equal intervals between the outer tube 56 and supporting the inner tube 55 and the outer tube 56, and a communication hole 54 formed by the inner tube 55, the outer tube 56 and the support column 57. .

  The outer diameter of the outer tube 56 needs to be the same outer diameter as the inner diameter of the outer needle base opening 32. Thereby, when the protrusion 51 is inserted and fitted into the outer needle base opening 32, the outer needle base space 33 does not communicate with a space other than the gap 21 of the outer needle 3 and the inner needle base space 52. , Has airtightness.

  The protruding portion opening 53 is a hole for inserting and fitting the proximal end side of the inner needle 4, and fixes the proximal end side of the inner needle 4 and the protruding portion opening 53 with an adhesive or the like. Thereby, the lumen of the inner needle 4 and the inner needle base space 52 communicate with each other.

  The communication hole 54 is a hole that communicates the inner needle base space 52 and the outer needle base space 33, and is formed from the inner needle base inner space 52 toward the distal end surface of the protruding portion 51. Further, as shown in FIG. 3, in the present embodiment, four holes are formed in an annular shape around the protruding portion opening 53, but there is no particular limitation, and the communication hole 54 is formed by suction with the syringe 10. Since the outer needle base space 33 only needs to have a negative pressure, the area and shape of the communication hole 54 are not limited.

  Here, according to the prior art, since the outer tube 56 and the communication hole 54 are not provided in the protruding portion 51 of the inner needle base portion 5, even if the outer needle base space 33 is airtight, the inner needle When negative pressure is applied in the base space 52, it is difficult to set the negative pressure in the outer needle base space 33. According to such a configuration, the inner needle base space 52 is negatively pressured using the syringe 10. Then, not only the inner lumen of the inner needle 4 but also the outer needle base space 33 can be set to a negative pressure through the communication hole 54. Since the outer needle base space 33 is airtight, the lumen of the outer needle 2 is also under negative pressure, and blood can easily flow from the distal end of the outer needle 2.

  The configuration of the indwelling needle according to the embodiment of the present invention has been described above. Next, the usage method of the indwelling needle which concerns on embodiment is demonstrated using FIG.

  4A shows a state in which the needle tip of the indwelling needle 1 of the puncture device 100 is inserted into the skin, FIG. 4B shows a state in which the needle tip portion 41 of the inner needle 4 has reached the blood, and FIG. FIG. 4D is a diagram showing a state in which the tip of the needle tip of the outer needle 2 has reached blood, and FIG. 4D is a diagram showing a state in which the inner needle 4 is removed from the outer needle 2 and the outer needle 2 is indwelled.

  First, as shown in FIG. 4A, the puncture device 100 is punctured into the skin 6 with the needle tip of the indwelling needle 1 directed toward the target blood vessel 7. Then, the plunger 11 of the syringe 10 is pulled, and the puncture tool 100 is pushed again in a state where the inner needle base space 52 and the outer needle base space 33 are negatively pressurized.

  Here, when only the needle tip portion 41 of the inner needle 4 among the needle tips of the indwelling needle 1 reaches the blood vessel 7, the inner needle base space 52 is in a negative pressure and communicates therewith. The lumen of the inner needle 4 also has negative pressure, and blood flows from the target blood vessel 7 into the inner needle base space 52 as shown in FIG. Here, the operator of the puncture device 100 visually confirms that blood is flowing into the inner needle base space 52 and confirms that the inner needle 4 has reached the blood vessel 7.

  When it is confirmed that the inner needle 4 has reached the blood vessel 7, the puncture device 100 is further pushed forward. Here, since the outer needle base space 33 is in a negative pressure state as well as the inner needle base space 52, when the outer needle 4 reaches the blood vessel 7, as shown in FIG. It flows into the outer needle base space 33 through 42 and the gap 21. If the operator of the puncture device 100 can visually recognize that blood is flowing into the outer needle base space 33, it can be confirmed that the outer needle 4 has reached the blood vessel 7.

  If it can be confirmed that the outer needle 4 has reached the blood vessel 7, the inner needle 4 is moved with the outer needle 2 placed in the target blood vessel 7 as shown in FIG. Pull out together with needle base 5 and syringe 10.

When the target blood vessel 7 is a peripheral vein, the infusion set is connected to the outer needle base opening 32 of the outer needle base 3 to start the infusion.
On the other hand, when the target blood vessel 7 is a deep blood vessel 7 such as a subclavian vein and a central venous catheter is placed, a guide wire called an advancer is accommodated in the outer needle base opening 32 of the outer needle base 3. Connect the guide wire supply tool and introduce the guide wire to the central vein. Then, leaving the guide wire in the blood vessel 7, the outer needle 2 is removed from the blood vessel 7 together with the outer needle base 3 and the guide wire supply tool, and then a central venous catheter is inserted into the blood vessel 7 along the guide wire. .

As described above, according to the present invention, it is possible to provide an indwelling needle that can reliably recognize the flashback of the outer needle with a simple structure. However, as described above, the present invention is based on the indwelling needle 1 according to the embodiment. It is not limited to.
For example, the inner needle base 5 according to the embodiment is formed with a protruding portion 51 having the same outer diameter as the inner diameter of the inner needle base opening 32 in order to make the inner needle base space 33 airtight. As an embodiment of the present invention, the outer needle base space 33 is airtight even if the distal end surface of the inner needle base 5 is formed with a groove into which the proximal end surface of the outer needle base opening 32 is fitted. Can have.
In addition, although the inner needle 4 according to the embodiment is a hollow needle, it may be a solid needle that does not secure the blood vessel 7.

  In the embodiment, the blood inflow portion is constituted by the groove portion 42 provided on the outer peripheral surface of the inner needle 4, but the outer needle 2 is formed by a hole portion that connects the outer peripheral surface of the outer needle 2 and the inner peripheral surface. A blood inflow portion through which blood flows into the gap portion 21 may be formed between the inner needle 4 and the inner needle 4, or a blood inflow portion may be formed by both the groove portion 42 and the hole portion.

It is a whole side view which shows the puncture tool which attached the syringe to the indwelling needle which concerns on this embodiment. FIG. 2 is an enlarged side cross-sectional view showing a cross section of the indwelling needle shown in FIG. FIG. 3 is a cross-sectional view of the puncture device shown in FIG. 1 cut along the line AA. It is a figure which shows the usage method of the puncture device shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Indwelling needle 2 Outer needle 3 Outer needle base 4 Inner needle 5 Inner needle base 6 Skin 7 Blood vessel 10 Syringe 11 Plunger 21 Gap part 31 Through-hole part 32 Outer needle base opening part 33 Outer needle base space 41 Needle tip part 42 Groove part 51 Protruding portion 52 Inner needle base space 53 Protruding portion opening 54 Communication hole 55 Inner tube 56 Outer tube 57 Support column 100 Puncture tool

Claims (3)

An indwelling needle comprising an outer needle, an outer needle base that holds the outer needle, an inner needle that is inserted through the outer needle, and an inner needle base that holds the inner needle,
A blood inflow portion for allowing blood to flow between the outer needle and the inner needle,
The inner needle base has a protrusion that fits into the outer needle base,
The indwelling needle is characterized in that the projecting portion has a communication hole for communicating the inside of the outer needle base and the inside of the inner needle base.   The indwelling needle according to claim 1, wherein the blood inflow portion is a groove portion formed along a longitudinal direction of an outer peripheral surface of the inner needle. The protrusion has an inner tube through which an inner needle is inserted, an outer tube fitted to an outer needle base, and a support that supports the inner tube and the outer tube,
The indwelling needle according to claim 1 or 2, wherein the communication hole is formed by the inner tube, the outer tube, and the support column.

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