JPH10201852A - Intravascular indwelling catheter device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intravascular indwelling catheter device which automatically moves and houses an inside needle into a protective mechanism with extremely simple operation and is capable of preventing the blood infection of a medical engineer. SOLUTION: This intravascular indwelling catheter device 1 has a catheter assembly consisting of a catheter 2 and a hub 3 fixed to its base end, an inside needle assembly consisting of the inside needle 5 having a blade surface for puncture projecting from the front end of the catheter and an inside needle hub 6 fixed to its base end and a housing member 8 for housing the catheter assembly mounting part of the inside needle assembly. The inside needle hub has a cylindrical projecting part 61 which is slidable in the housing member and the rear part of which projects from the housing member. The device has a detaining mechanism 11 for releasably detaining the inside needle hub to the housing member in the state of projecting the catheter assembly from the housing member by pressing the rear end of the cylindrical projecting part of the inside needle hub to the front end side and a hermetic holding member 12 for forming a reduced pressure space in the housing member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intravascular indwelling catheter device which is temporarily indwelled in a blood vessel for blood transfusion, transfusion, or the like. More specifically, the present invention relates to an intravascular indwelling catheter device having an inner needle storage function capable of accommodating an inner needle which is punctured into a patient's vein or the like and which is removed from the vein after the catheter is indwelled.

[0002]

2. Description of the Related Art Conventionally, many catheter devices for indwelling in a blood vessel have been used. As the catheter device for indwelling in a blood vessel, a catheter assembly having a catheter for indwelling in a blood vessel and a catheter hub fixed to a proximal end portion of the catheter, a catheter assembly is inserted through the catheter assembly so as to be able to be removed, and a puncture is made at the distal end In general, the inner needle assembly includes an inner needle having a cutting blade surface and an inner needle hub fixed to a base end of the inner needle and engaged with a rear end of the catheter hub. When performing blood transfusion, infusion, hemodialysis, or the like with this intravascular indwelling catheter device, first, an indwelling catheter assembly in which the catheter assembly and the inner needle assembly are integrated is placed in a patient's blood vessel (for example, in a vein). ), Then pull out the inner needle assembly, connect a connector such as a blood transfusion set (or transfusion set or blood circuit) to the remaining catheter assembly, and administer the target blood (or drug solution) or blood Perform extracorporeal circulation.

[0003] In recent years, there has been a demand for more surely preventing medical technicians from being erroneously infected with AIDS or hepatitis during the above operation. However, in the operation of such a catheter device for indwelling in a blood vessel, the inner needle assembly is removed in a state where the catheter is indwelled in the blood vessel of the patient. Fixation work is also necessary, and the removed inner needle assembly is left with the patient's blood or the like attached to the tip of the inner needle of the removed inner needle assembly, and the above-described catheter fixing operation is completed. After that, the inner needle was covered with a cap or the like and discarded. However, if it is left on a table etc. after being removed without taking necessary precautions, it may fall on the floor etc., causing blood infection, and furthermore, danger of sticking the inner needle exposed when the cap is fitted to the finger There was also nature. Therefore,
Recently, an intravascular indwelling catheter device provided with an inner needle protection mechanism has been proposed. Specifically, Japanese Patent Application Laid-Open No. 7-3
No. 08386. The catheter device for indwelling in a blood vessel is configured such that the needle is movable to the rear end side, and the moved needle is housed inside the housing.

[0004]

However, in the above catheter device for indwelling an intravascular catheter, the operation of storing the needle in the housing after the indwelling of the intravascular indwelling catheter is completed is performed by operating a trigger to restore the compression spring. Done automatically by force. However, this device cannot return the needle stored in the housing to a usable state when the trigger is operated during the catheter placement operation. For this reason, blood vessels cannot be secured during use, and the needle must be kept in a protruding state until the blood vessel securing operation is performed again. Therefore, an object of the present invention is to automatically move and store the inner needle assembly in the protection mechanism by extremely easy operation after the indwelling operation of the indwelling catheter in the blood vessel, which can prevent blood infection of medical technicians. Furthermore, even if the inner needle assembly is temporarily stored in the storage member until the blood vessel is not secured during use and the blood vessel securing operation is performed again, the cylindrical protrusion of the inner needle hub is again required. It is an object of the present invention to provide an intravascular indwelling catheter device that can return to a state where the indwelling operation can be performed by pushing a rear end portion of the portion toward the distal end side.

[0005]

To achieve the above object, a catheter assembly comprising an intravascular indwelling catheter, a catheter hub fixed to a proximal end of the intravascular indwelling catheter, and the catheter An inner needle having an inner needle having a puncture blade surface protruding from the catheter at the distal end thereof, and an inner needle hub fixed to a proximal end of the inner needle; A catheter member for accommodating the catheter assembly attachment portion of the inner needle assembly equipped with the catheter assembly, wherein the inner needle hub slides in the accommodation member. The inner needle catheter device is provided with a tubular protrusion that extends to the rear end side and has a rear portion protruding from the storage member. Push toward the tip A locking mechanism for releasably locking the inner needle hub of the inner needle assembly near the distal end of the storage member in a state where the catheter is protruded from the storage member; and An intravascular indwelling catheter device having an airtight holding member for forming a decompressed space in the storage member by moving to the distal end side. In order to achieve the above object, a catheter assembly comprising an intravascular indwelling catheter, a catheter hub fixed to a proximal end of the intravascular indwelling catheter, and a catheter assembly removably inserted therethrough. An inner needle having a puncture blade surface protruding from the catheter at the distal end thereof, and an inner needle hub fixed to a proximal end of the inner needle, wherein the catheter assembly is mounted. A catheter member for indwelling the blood vessel, comprising a storage member capable of storing at least the blade surface portion of the inner needle of the inner needle assembly, wherein the inner needle hub is slidable in the storage member. And, comprises a cylindrical projecting portion that extends to the rear end side and the rear end portion protrudes from the storage member, the catheter device for indwelling in a blood vessel,
A locking mechanism for releasably locking the inner needle hub of the inner needle assembly near the distal end of the storage member; It is locked in a more protruding state, the inside of the storage member is a decompression space, and the attractive force by the decompression space is such that the blade portion of the inner needle is released when the locking mechanism is unlocked. And the catheter device for indwelling in a blood vessel further has an airtight holding member for holding the airtightness of the decompressed space. It is. In order to achieve the above object, a catheter assembly comprising an intravascular indwelling catheter, a catheter hub fixed to a proximal end of the intravascular indwelling catheter, and a catheter assembly removably inserted therethrough. And an inner needle assembly including an inner needle having a puncture blade surface protruding from the catheter at the distal end, an inner needle hub fixed to the proximal end of the inner needle, and the catheter assembly. An intravascular indwelling catheter device comprising a storage member that stores the catheter assembly mounting portion of the inner needle assembly, wherein the inner needle hub is slidable within the storage member, and The catheter device for indwelling in a blood vessel is provided with a tubular protrusion extending to an end side and a rear part protruding from the storage member. The income A locking mechanism for releasably locking the inner needle hub of the inner needle assembly near the distal end of the storage member in a state where the inner needle hub protrudes from the member, and moving the inner needle hub in a distal direction. And a pulling force applying mechanism for applying a force for pulling the inner needle hub generated toward the rear end of the storage member toward the rear end of the housing member. In order to achieve the above object, a catheter assembly comprising an intravascular indwelling catheter, a catheter hub fixed to a proximal end of the intravascular indwelling catheter, and a catheter assembly removably inserted therethrough. An inner needle having a puncture blade surface protruding from the catheter at the distal end thereof, and an inner needle hub fixed to a proximal end of the inner needle, wherein the catheter assembly is mounted. A catheter device for indwelling an intravascular vessel comprising a storage member capable of storing at least the blade surface portion of the inner needle of the inner needle assembly, wherein the inner needle hub is slidable in the storage member. And a tubular protruding portion that extends to the rear end side and has a rear end portion protruding from the storage member. The catheter device for indwelling in a blood vessel includes the inner needle hub of the inner needle assembly and the distal end of the storage member. Can be unlocked nearby The inner needle assembly, the catheter is locked by the locking mechanism in a state where the catheter protrudes from the storage member, further, the intravascular indwelling catheter device, A pulling mechanism for pulling the inner needle hub toward the rear end of the storage member, and applying a pulling force for storing the inner needle up to the blade surface portion in the storage member when the locking mechanism is released; Further, by pushing the rear end of the cylindrical projecting portion toward the distal end side after the attraction of the attraction applying mechanism has disappeared, an intravascular indwelling device capable of generating attraction by the attraction applying mechanism is provided. It is a catheter device.

[0006] The airtight holding member is, for example,
An annular elastic member provided on the outer surface of the inner needle hub and in contact with the inner surface of the storage member. Further, it is preferable that the catheter device for indwelling in a blood vessel has a second airtight holding member provided on an inner surface of the storage member and in contact with an outer surface of the cylindrical protrusion of the inner needle hub. . The catheter device for indwelling in a blood vessel may further include the locking mechanism in a state where the catheter assembly is mounted on the inner needle assembly and the inner needle hub is locked by the locking mechanism. It is preferable to have an unlocking suppression mechanism that abuts (abuts on the catheter hub) and suppresses unlocking when the unlocking operation is performed. Then, the lock release suppressing mechanism is, for example, a protrusion provided in the lock mechanism, the protrusion which enters the catheter hub in a state where the inner needle hub to which the catheter assembly is mounted is locked. is there. In addition, the lock release suppressing mechanism is provided, for example, on the protrusion protruding from the rear end of the catheter hub, and provided in the lock mechanism, in a state where the inner needle hub to which the catheter assembly is mounted is locked. And a hole for accommodating the projection of the catheter hub. It is preferable that a pressing member having a flat rear end surface is provided at the rear end of the cylindrical protrusion of the inner needle hub. Furthermore, it is preferable that the inside of the cylindrical protrusion communicates with the internal space of the inner needle.

[0007] According to the catheter device for indwelling in a blood vessel of the present invention, the rear end of the cylindrical projection of the inner needle hub is pushed forward.
By moving the inner needle hub to the distal end side, a decompression space is formed in the rear part in the storage member, and the inner needle hub is always pulled to the rear end side of the storage member by the suction force of the decompression space. Become. And in this state, the inner needle hub is
The locking mechanism locks the catheter and the inner needle (catheter assembly mounting portion) in a state of protruding from the storage member. In this state, after the patient is punctured, the inner needle is removed from the catheter, and the locking of the inner needle hub by the locking mechanism is released, the inner needle assembly is moved to the storage member by the suction force of the reduced pressure space. The inner needle portion including the blade surface of the inner needle assembly is automatically stored in the storage member.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an intravascular indwelling catheter device according to the present invention.
FIG. 1 is a front view of an embodiment of the catheter device for indwelling in a blood vessel according to the present invention. FIG. 2 is a plan view of the intravascular indwelling catheter device shown in FIG. 1. FIG. 3 is a sectional view taken along line A-A in FIG.
It is a line sectional view. FIG. 4 is a right side view of the intravascular indwelling catheter device shown in FIG. 1. FIG. 5 is an exploded view of the intravascular indwelling catheter device shown in FIG. 1. FIG.
FIG. 2 is a cross-sectional view of the catheter device for indwelling in a blood vessel shown in FIG. 1 during a catheter indwelling operation. FIG. 7 is a cross-sectional view of FIG.
It is a B sectional view. FIG. 8 is a sectional view taken along line CC of FIG.

As shown in FIG. 5, an intravascular indwelling catheter device 1 of this embodiment
And a catheter assembly 4 comprising a catheter hub 3 fixed to the proximal end of the catheter 2 for indwelling in a blood vessel, and a puncture needle which is removably inserted into the catheter assembly 4 and protrudes from the distal end of the catheter 2. Inner needle 5 having blade surface 5a
And an inner needle assembly 7 comprising an inner needle hub 6 fixed to the proximal end of the inner needle 5, and a storage member for storing the catheter assembly mounting portion of the inner needle assembly 7 having the catheter assembly 4 mounted thereon. 8
And

The inner needle hub 6 is slidable in the housing member 8 and extends to the rear end side, the inside communicates with the internal space of the inner needle 5, and the rear portion projects from the housing member 8. A cylindrical protrusion 61 is provided. Further, the catheter device 1 for indwelling in a blood vessel pushes the rear end portion 62 of the cylindrical projecting portion 61 of the inner needle hub 6 to the distal end side, and moves the inner needle while the catheter assembly 4 is projected from the storage member 8. A locking mechanism 11 for releasably locking the hub 6 near the distal end of the storage member 8;
Has an airtight holding member 12 for forming a decompression space in the storage member 8 by moving to the front end side.

Hereinafter, each configuration will be sequentially described. As shown in FIGS. 1, 2, 5 and 10, the catheter assembly 4 is composed of the catheter 2 temporarily indwelled in a blood vessel and the catheter hub 3 fixed to the rear end of the catheter 2. Has become. The catheter 2 is preferably a tubular body having a lumen inside, and preferably has a degree of transparency and a certain degree of flexibility such that the color of the liquid flowing on the inner surface can be confirmed. As a molding material of the catheter 2 satisfying such conditions, PTFE, ETFE, FEP, PF
Fluorine resins such as A and olefin resins such as polypropylene and polyethylene are preferred. Further, the outer diameter of the catheter is generally about 0.6 to 2.2 mm. The length is generally about 15 to 65 mm.

The catheter hub 3 is formed in a cylindrical body,
The interior communicates with the lumen of the catheter. The inner shape of the rear end of the catheter hub 3 is formed in a shape corresponding to the outer shape of the inner needle hub 6 so that the catheter hub 3 is detachably attached to the distal end of the inner needle hub 6 of the inner needle assembly 7 described later. ing. The catheter hub 3 functions as a connector for connecting to a drug solution injection line when a drug solution or the like is injected after the inner needle 5 is withdrawn. For this reason, the catheter hub 3
The rear end of the inner needle assembly 3 has an opening 3a having a predetermined female luer taper shape.
Of the inner needle hub 6 can be inserted. It is preferable that the catheter hub 3 has such a degree of transparency that the inflow of the drug solution and blood can be confirmed. As a material for forming the catheter hub, a thermoplastic synthetic resin such as polypropylene, polyethylene, polycarbonate, or polystyrene can be used. In particular, the above-mentioned resins and those having a certain degree of transparency are preferable.

The catheter 2 and the catheter hub 3 may be fixed with an adhesive, a solvent, or the like. However, if possible, it is preferable not to use such a fixing agent. It is preferable to insert and fix by caulking using this metal pipe.
On the rear end outer surface of the catheter hub 3, as shown in FIG.
Rib 3 extending outward and in a direction perpendicular to the axial direction
b, 3c are formed. The lower ends of the ribs 3b and 3c abut against the upper end 6b of the protrusion 6a of the inner needle hub 6 shown in FIG. 5, and stabilize the state of attachment of the catheter assembly 4 to the inner needle assembly 7. In addition, it prevents the catheter assembly 4 from rotating around the axis.

As shown in FIGS. 1, 2, 5 and 10, the inner needle assembly 7 is composed of the inner needle 5 and an inner needle hub 6 fixed to the rear end. Inner needle 5 and inner needle hub 6
May be fixed by an adhesive, a solvent, or the like,
If possible, it is preferable not to use such a fixing agent, and it is preferable to use a thermoplastic material as the inner needle hub and to fix the inner needle by induction heating of the inner needle. The inner needle 5 is for introducing the indwelling catheter 2 into a blood vessel of a patient, and has a puncture blade surface 5a at a distal end. When the catheter assembly 4 is mounted on the inner needle assembly 7, it has a length such that it penetrates the inside of the catheter 2 and the blade surface 5 a protrudes from the distal end of the catheter 2. As the inner needle 5, a hollow needle formed of stainless steel or the like can be suitably used.

The inner needle hub 6 includes a hub main body 60, a cylindrical projection 61 extending rearward from the hub main body, a pressing member 62 fixed to the rear end of the cylindrical projection, and a cylindrical projection. And a filter member 63 formed of a porous membrane or a sintered body having a blood-impermeable property and a gas-permeable property inserted into the rear end of the part. The internal space 64 of the cylindrical projection 61 communicates with the internal space of the inner needle 5. The cylindrical projecting portion 61 has a rear portion projecting from a rear end of a storage member 8 described later. Note that the pressing member 62 has a flat rear end surface, which facilitates pressing. Further, an opening is formed in the center of the pressing member 62 so as not to close the rear end opening of the cylindrical protrusion. In this way, the fact that the rear end of the cylindrical protrusion is not closed and the provision of the blood-impermeable and air-permeable filter allows blood to pass through the inner needle and flow into the cylindrical protrusion, and This prevents blood from flowing out of the protruding part. In addition, by forming the cylindrical protrusion from a transparent material, when the tip of the inner needle reaches the inside of the blood vessel, blood passes through the inner needle and reaches the rear end of the cylindrical protrusion. Since the flashback can be confirmed, it is possible to confirm the securing of the blood vessel by the inner needle. Furthermore, if the storage member described later is also formed of a transparent material similarly to the cylindrical protrusion, it is also possible to check the flashback blood flowing out from the rear end of the inner needle at the distal end of the cylindrical protrusion. . Furthermore, since the cylindrical projection has a certain volume,
Even if it takes time to secure a blood vessel, it is possible to observe the state of rising of the liquid level and confirm the securing of the blood vessel.

The inner needle hub 6 has a function of attaching the catheter assembly 4 to a predetermined position, in addition to a function of fixing the inner needle 5,
The inner needle assembly 7 is brought into contact with a locking portion 11 b of a locking mechanism 11, which will be described later, and locks the inner needle assembly 7 near the distal end of the storage member 8.
The locking mechanism 11 for restricting the movement of the storage member to the rear end side, and the storage member 8
Depressurized space formation and maintenance function (airtight holding member) 1 for forming and maintaining a decompressed space in the inner rear portion
2 is provided. Further, the catheter device 1 for indwelling in a blood vessel of this embodiment has a locking mechanism in a state where the catheter assembly is mounted on the inner needle assembly and the inner needle hub is locked by the locking mechanism. It has an unlocking suppression mechanism that abuts (abuts on the catheter hub) when unlocking operation is performed to suppress unlocking. The lock release suppressing mechanism of this embodiment is provided on the lock mechanism 11, and is formed by a protrusion 11a that enters the catheter hub when the catheter assembly is mounted on the inner needle assembly.
The inner needle hub 6 has a guiding function for guiding the protruding portion 11a into the catheter hub 3.
Further, as shown in FIG. 3, the distal end of the inner needle hub 6 has a shape capable of entering the rear end of the catheter hub 3.

A first enlarged diameter portion 6c is provided near the center of the inner needle hub 6, as shown in FIG.
The first enlarged diameter portion 6c is for regulating a mounting position of the catheter assembly 4 to the inner needle assembly 7, and a distal end surface thereof abuts on a rear end surface of the catheter hub 3, and the catheter is located at that position. With the hub locked, the catheter assembly 4
Attach. In this state, the tip blade surface of the inner needle projects from the tip of the catheter. Rear end face 6e of first enlarged diameter portion 6c
As shown in FIG. 6, when the inner needle assembly 7 with the catheter assembly 4 mounted thereon is moved to a position near the distal end of the storage member 8 as shown in FIG. The inner needle hub 6 is restricted from moving toward the rear end side by contact with the surface.
This locking force opposes the suction force of the decompression space formed in the storage member 8, and as shown in FIG. 6, the suction force and the above-described locking force cause the catheter assembly 4 and the inner needle assembly to move. The three-dimensional body 7 is locked or fixed near the distal end of the storage member 8. Further, as described above, the ribs 3b, 3 of the catheter hub 3 are provided at the lower portion on the distal end side of the first enlarged diameter portion 6c.
A thin curved protrusion 6a that engages with c is formed, thereby restricting rotation of the catheter hub 3.

As shown in FIGS. 3 and 5, a second enlarged diameter portion 6d is provided on the rear side of the first enlarged diameter portion 6c, and an airtight holding member is formed on the outer peripheral surface thereof. A gasket 12 is provided. The airtight holding member 12 forms a closed decompression space formed by the holding member 12, the inner needle hub 6, and the inner surface of the storage member 8 in the storage member 8 when the inner needle assembly 7 moves in the distal direction. At the same time, the depressurized state is maintained while the inner needle hub 6 is locked by the locking mechanism 11. The holding member 12 is slidable in the axial direction while being in close contact with the inner surface of the storage member 8. Holding member 12
A member that exhibits air-tightness by being annularly contacted with the inner surface of the storage member 8 is used. In particular, when the storage member 8 is stored in the storage member 8, It is preferable that the housing member is pressed and slightly elastically deformed to come into close contact with the inner surface of the storage member. In the embodiment shown in the drawings, the holding member 12 is an annular body formed of an elastic material, and the outer peripheral surface thereof is exposed in an annular groove provided on the outer surface of the second enlarged diameter portion 6d of the hub 6. Is attached. Specifically, a part of the holding member 12 has entered the annular groove. In the catheter device for indwelling in a blood vessel according to the present invention, since the inner needle hub 6 has such an airtight holding member 12, the inner needle hub 6 has an inner space formed by the suction force of the decompression space formed in the rear part in the storage member 8. The needle assembly 7 can be automatically stored in the storage member 8.

As the elastic material forming the airtight holding member 12, for example, rubber materials such as latex rubber, silicon rubber, isoprene rubber, and synthetic resin elastomers such as SBS, SEBS, and polyurethane can be suitably used. The holding member 12 may be fixed to the hub 6. Further, the holding member 12 may be formed integrally with the hub 6 by two-color molding or insert molding. Further, the form and position of the holding member 12 are not limited to those shown in the drawings, and may be an elastic body that annularly covers the outer surface of the cylindrical protrusion.

Further, on the upper portion of the inner needle hub 6, as shown in FIGS. 2, 3, 6 and 9, it is located between the first enlarged diameter portion 6c and the second enlarged diameter portion 6d. 6g axially extending recess
Are formed. When locking the catheter assembly 4 and the inner needle assembly 7 near the distal end of the storage member 8, the recess 6 g stores the protrusion 11 a of the locking mechanism 11 b as shown in FIGS. 9 and 6. , For positioning (guidance) in the rear end opening of the catheter hub 3.

The storage member 8 can store the catheter assembly mounting portion of the inner needle assembly 7 to which the catheter assembly 4 is mounted before use, and stores the entire inner needle 5 after use. belongs to. Therefore, as shown in FIG.
The inner needle assembly 7 having the catheter assembly 4 mounted therein has at least an internal space 8b for accommodating the catheter assembly mounting portion.

The housing member 8 is a cylindrical body having an opening 8a at the front end and an opening at the rear end for projecting the cylindrical projection 61 of the inner needle hub. In use, the rear end (in other words, the pressing member 62) of the cylindrical protrusion of the inner needle hub is pressed, so that the catheter assembly 4 and the inner needle assembly 7 are pressed.
Is moved in the distal direction, and as shown in FIGS. 6 and 9, the catheter assembly mounting portion of the inner needle assembly 7 to which the catheter assembly 4 is mounted projects from the opening 8a. Also,
The storage member 8 includes the catheter assembly 4 and the inner needle assembly 7.
Is formed of an airtight material so that a decompression space can be formed rearward in the storage member 8 with the movement in the tip direction. At least a portion from the rear end to a portion where the airtight holding member 12 slides has no portion communicating with the outside, and is configured to form a sealed space. A through hole 83 is provided at the rear end of the storage member 8 of this embodiment for venting air during manufacturing. This through hole 83 is for venting air when the catheter assembly 4 and the inner needle assembly 7 are housed in the housing member 8 at the time of manufacture, and is provided by the seal member 82 attached after the housing. Is sealed (closed).
The through hole may be provided not on the rear end of the storage member 8 but on the side surface. In this case, the seal member is also fixed to the side surface of the storage member.

The storage member 8 includes a second airtight holding member 81 provided on the inner surface of the storage member and in contact with the outer surface of the cylindrical protrusion 61 of the inner needle hub 6. Specifically, as shown in FIG. 3, the rear end portion of the storage member 8 includes an annular projection protruding inward and an annular groove formed in the annular projection. The airtight holding member 81 is attached to the annular groove.

The second airtight holding member 81, like the airtight holding member 12 described above, holds the holding member 12 and the housing member 8 in the housing member 8 when the inner needle assembly 7 moves toward the distal end.
Along with assisting the formation of a closed decompressed space formed by the inner surface of the inner needle, the depressurized state is assisted while the inner needle hub 6 is locked by the locking mechanism 11. The airtight holding member 81 allows the cylindrical protrusion 61 to slide in the axial direction in a state of being in close contact with the surface of the cylindrical protrusion 61. As the holding member 81, a member that exhibits airtightness by making its entire circumference annularly contact the outer surface of the cylindrical protrusion 61 is used. In particular, the holding member 81 is stored in the storage member 8. A member that is pressed between the inner surface of the member 8 (the surface of the annular groove) and the cylindrical projecting portion 61 and slightly elastically deforms so as to adhere to the surface of the cylindrical projecting portion is preferable. In the illustrated embodiment, the holding member 81 is an annular body formed of an elastic material. As the airtight holding member 81, the same airtight holding member 12 as described above is used. As a material for forming the storage member 8 and the inner needle hub (including the cylindrical protrusion), a thermoplastic synthetic resin such as polypropylene, polyethylene, polycarbonate, or polystyrene can be used. What has the transparency and the intensity | strength which can endure under reduced pressure is suitable.

The storage member 8 is provided with a locking mechanism 11 for locking the inner needle hub 6 of the inner needle assembly 7 near the distal end of the storage member 8. In this embodiment, the locking mechanism 11 is attached to an outer surface near the tip of the storage member 8. As shown in FIG. 1 and FIG. 4, the locking mechanism 11 is mounted such that the two plate-shaped locking mechanism mounting members 51 and 52 fixed to the outer surface of the storage member 8 and the upper surface have the curved shape of the storage member. This is performed using a mounting member fixing member 53 having a corresponding shape. Specifically, a mounting member fixing member 53 is fixed to the lower surface of the distal end portion of the tubular storage member, and locking mechanism mounting members 51 and 52 are fixed to both side surfaces of the mounting member fixing member 53. And the locking mechanism 1
1 are inserted into bearing recesses formed in the locking mechanism mounting members 51 and 52. As shown in FIG. 3, the locking mechanism 11 holds the shaft 11d in this state. Around a predetermined angle. further,
As shown in FIG. 3, the locking mechanism 11 of this embodiment includes an operating portion 11e, a locking portion 11b extending downward from a distal end of the operating portion 11e, and a distal end from a central lower end of the locking portion 11b. It comprises a protruding portion 11a that extends.

The operating portion 11e is for pressing a part of the operating portion 11e with a finger when releasing the lock. The operating portion 11e has a distal end side operating portion 11g and a rear end provided at a predetermined angle with respect to the distal end side operating portion 11g. It is composed of a side pressing portion 11f and a shaft portion 11d provided near the center of both sides and extending in a direction perpendicular to the axial direction. The rear end side pressing portion 11f releases the engagement between the first enlarged diameter portion 6c of the inner needle hub 6 and the locking portion 11b, and when the inner needle assembly 7 is stored in the storage member 8 from above. This is the part to be pressed. Due to this pressing, as shown in FIG. 11, the rear end side pressing portion 11f slightly lowers with the shaft portion 11d as a fulcrum, and the locking portion 11b moves upward to release the locked state.

A biasing member 14 having elasticity is stored between the rear end pressing portion 11f and the outer surface of the storage member 8, and when the rear end pressing portion 11f is not pressed, the urging member 14 shown in FIG. As shown in FIG. 7, the operating portion 11e is urged such that the rear end pressing portion 11f is located above and the distal end operating portion 11g is located below. By providing the urging member 14 in this manner, the locking by the locking portion 11b can be automatic, and the operation of the operation portion 11e can be only a pressing operation at the time of unlocking. Operation becomes extremely easy. As the urging member 14, a sponge material, a rubber material,
A spring material or the like can be suitably used.

As shown in FIG. 7 which is a cross-sectional view taken along the line BB of FIG. 6, the protrusion 11a penetrates into the catheter hub 3 and serves as a lock release suppressing mechanism for suppressing the lock release of the lock mechanism 11. Configure. Specifically, during use, the rear end side pressing portion 11f is pressed by an erroneous operation, thereby preventing the inner needle assembly 7 to which the catheter assembly 4 is attached from being stored in the storage member 8. When the operation unit is pressed while the catheter assembly 4 is mounted, the catheter hub 3
Is to be engaged. In this embodiment, the protrusion 11a
Is configured to penetrate into the catheter hub 3. Specifically, as shown in FIGS. 6 and 7, a state in which the inner needle hub 6 is locked by the locking portion 11 b of the locking mechanism 11. In the embodiment, the inner needle hub 6 is housed in the concave portion 6g, and the distal end portion is formed so as to be located in the rear end opening of the catheter hub 3. That is, in this state, even if the rear end side pressing portion 11f is erroneously touched, the upper surface of the protruding portion 11a abuts on the inner surface of the catheter hub 3, so that the rear end side pressing portion 11f cannot be further pressed. Therefore, the locked state is not released, and the inner needle assembly 7 to which the catheter assembly 4 is attached is not stored in the storage member 8 before or during use. In addition, as a molding material of the locking mechanism 11, a thermoplastic synthetic resin such as polypropylene, polyethylene, polycarbonate, and polystyrene can be suitably used.

Next, a description will be given of an intravascular indwelling catheter assembly 20 according to another embodiment of the present invention shown in FIG. The same components are denoted by the same reference numerals. An intravascular indwelling catheter device 20 includes a catheter assembly 4 including an intravascular indwelling catheter 2 and a catheter hub 3 fixed to a proximal end portion of the intravascular indwelling catheter 2.
An inner needle 5 having a puncturing blade surface 5a protruding from the distal end of the catheter 2 and removably inserted into the catheter assembly 4, and an inner needle hub 6 fixed to the proximal end of the inner needle 5. An inner needle assembly 7 having a catheter assembly 4 mounted thereon and a storage member 8 capable of storing at least the blade surface 5a of the inner needle 5 of the inner needle assembly 7 are provided.

The inner needle hub 6 is slidable in the housing member 8 and extends to the rear end side, the inside communicates with the internal space of the inner needle 5, and the rear end protrudes from the housing member 8. A cylindrical projection 61 is provided. Further, the intravascular indwelling catheter device 20 includes the inner needle hub 6 of the inner needle assembly 7 and the storage member 8.
The inner needle assembly 7 is locked by the locking mechanism 11 in a state where the catheter 2 protrudes from the storage member 8.
Further, the inside of the storage member 8 is a decompression space. The attractive force of the decompression space is such that when the locking mechanism 11 releases the lock, the blade member 5 a of the inner needle 5 can be stored in the storage member 8. The intravascular indwelling catheter device 20 can maintain the airtightness of the decompressed space, and pushes the rear end of the cylindrical projection 61 toward the distal end after the decompressed space disappears, so that the decompressed space is again stored in the storage member 8. Airtight holding member 12 capable of forming
have.

The basic difference between the intravascular indwelling catheter device 20 and the above-described intravascular indwelling catheter device 1 is that the inner needle assembly having the catheter assembly mounted thereon in advance is held by the locking mechanism 11 by the storage member 8. In the vicinity of the distal end, a storage space 21 that is locked and decompressed is formed in the storage member 8, and a cap 23 that covers the catheter assembly is attached to the distal end of the storage member 8. It is a point. Other points and components are the same. By adopting such a configuration, the operation of moving the catheter assembly 4 and the inner needle assembly 7 to the distal end side of the storage member 22 at the time of use becomes unnecessary. In addition,
The cap 23 covers the distal end side operation portion 11g of the locking mechanism 11 so as to disable the operation of the locking mechanism 11, and fixes the locking mechanism 11.

The catheter assembly, inner needle assembly, storage member, locking mechanism and the like may be the same as those described above. As shown in FIG. 12, the airtight holding member provided in the inner needle hub can hold the airtightness of the decompressed storage space 21 in a state where the inner needle hub is locked by the locking mechanism, And, if the blood vessels cannot be secured during use,
Until the blood vessel securing operation is performed again, even if the inner needle assembly is temporarily stored in the storage member, the rear end of the cylindrical protrusion is pressed, and the inner needle assembly is moved to the distal end side. By doing
The inside of the storage member can be brought into a reduced pressure state again. Specifically, the one shown in FIG. 12 is preferable, and the one shown in FIG. 12 is the same as the airtight holding member also shown and described in FIG. It is preferable to provide a second airtight holding member at the rear end of the storage member, as shown in FIG. 12, similarly to the one shown in FIG. 3 and described above.

The storage member has a hardness that can withstand the reduced pressure without being deformed and a certain degree of gas barrier property so that the internal reduced pressure state can be reliably maintained after manufacture until use. It is preferable to form it. As such a method, it is preferable to use a material having a high gas barrier property, for example, an acrylonitrile-based resin, polyvinyl chloride, polyethylene terephthalate, PMMA (polymethyl methacrylate), a polyether resin, or the like. As the polyester-based resin, polyethylene terephthalate, a mixture of polyethylene terephthalate and polyethylene isophthalate-based resin, and the like are preferable. Further, when formed of a material having a low gas barrier property (for example, polypropylene, polyethylene, polystyrene, etc.), the surface (for example, the outer surface) of the storage member is provided with a gas barrier property of polyvinyl alcohol, ethylene-vinyl alcohol copolymer, or the like. It can be used by coating a film having the same, or by devising a packaging form in order to maintain a reduced pressure inside the bottomed tube. The catheter assembly 20 can be manufactured, for example, by performing a storing operation of the inner needle assembly 7 in which the catheter assembly 4 is mounted in the storing member 8 under a reduced-pressure atmosphere. In this case, it is not necessary to form a through hole at the rear end of the storage member 8, and a seal member for closing the through hole is not required.

A catheter assembly 30 for indwelling in a blood vessel according to another embodiment of the present invention shown in FIG. 13 will be described. The same components are denoted by the same reference numerals. The catheter device 30 for indwelling in a blood vessel of this embodiment includes a catheter assembly 4 including a catheter 2 for indwelling in a blood vessel and a catheter hub 3 fixed to a proximal end portion of the catheter 2 for indwelling a blood vessel, and a catheter assembly. 4 so that it can be removed
An inner needle assembly 7 including an inner needle 5 having a puncture blade surface 5a protruding from the distal end of the catheter 2, an inner needle hub 6 fixed to the proximal end of the inner needle 5, and a catheter assembly 4 A storage member 8 for storing the catheter assembly mounting portion of the mounted inner needle assembly 7.

The inner needle hub 6 is slidable in the housing member 8 and extends to the rear end side, the inside communicates with the internal space of the inner needle 5, and the rear portion projects from the housing member 8. A cylindrical protrusion 61 is provided. Further, the catheter device 30 for indwelling in a blood vessel pushes the rear end portion 62 of the cylindrical protrusion 61 of the inner needle hub 6 toward the distal end side, and moves the inner needle in a state where the catheter assembly 4 is projected from the storage member 8. A locking mechanism 11 for releasably locking the hub 6 near the distal end of the storage member 8, and an inner needle hub generated by the movement of the inner needle hub 6 toward the distal end is pulled toward the rear end of the storage member 8. Attraction applying mechanism 31 for applying force
(In other words, a biasing mechanism for biasing the inner needle hub toward the rear end of the storage member).

The basic difference between the catheter device 30 for indwelling in blood vessel and the catheter device 1 for indwelling in blood vessel described above is that a mechanism for storing the inner needle portion of the inner needle assembly in the storage member after use. Only the differences are the same. In the above-described catheter assembly 1 of the embodiment, the inner needle is housed in the housing member by the attraction of the reduced pressure space formed in the housing member. However, in the catheter assembly 30 of this embodiment, one end is formed at the rear end 33 of the main body of the inner needle hub 6.
(In other words, a distal end portion of the cylindrical projection), and an elastic member 31 having the other end fixed to the rear end of the storage member 8 is provided. The inner needle portion is stored in the storage member. In this embodiment, the rear end of the elastic member is fixed by being sandwiched between the fixing member 34 fixed to the rear end of the storage member and the rear end of the storage member 8. As the elastic member 31, a spring member such as a coil spring as shown in FIG. 13 is preferable, but a rubber member such as a string or a rod may be used. In the intravascular indwelling catheter device 30 as well, after the attractive force applied to the attractive force applying mechanism 31 has once disappeared, by pushing the rear end of the cylindrical protrusion 61 toward the distal end side, the attractive force applying mechanism 31 again operates. Attraction can be generated.

Next, a description will be given of an intravascular indwelling catheter assembly 40 according to another embodiment of the present invention shown in FIG. The same components are denoted by the same reference numerals. An intravascular indwelling catheter assembly 40 includes a catheter assembly 4 including an intravascular indwelling catheter 2 and a catheter hub 3 fixed to a proximal end portion of the intravascular indwelling catheter 2.
An inner needle 5 having a puncturing blade surface 5a protruding from the distal end of the catheter 2 and removably inserted into the catheter assembly 4, and an inner needle hub 6 fixed to the proximal end of the inner needle 5. And an accommodating member 8 capable of accommodating at least the inner needle portion of the inner needle assembly 7. The inner needle hub 6 is slidable in the storage member 8 and extends to the rear end side, the inside communicates with the internal space of the inner needle 5, and the rear end projects from the storage member 8. The projection 61 is provided.

The intravascular indwelling catheter device 40 includes a locking mechanism 11 for releasably locking the inner needle hub 6 of the inner needle assembly 7 near the distal end of the storage member.
Are locked by the locking mechanism 11 in a state where the catheter assembly 4 protrudes from the storage member 8. Furthermore, the catheter device 40 for indwelling in a blood vessel pulls the inner needle hub 6 toward the rear end of the storage member 8 when the locking mechanism 11 is unlocked,
An attractive force applying mechanism 31 (in other words, an attractive force applying mechanism) that applies an attractive force for storing the blade 5a of the inner needle 5 in the storage member 8 up to the blade surface 5a.
Generated by the inner needle hub moving toward the tip of the storage member,
A biasing mechanism for biasing the inner needle hub toward the rear end of the storage member, and pressing the rear end of the cylindrical projection 61 toward the front end after the attraction of the attractive force applying mechanism 31 has disappeared. The attraction can be generated again by the attraction applying mechanism 31.

The basic difference between the intravascular indwelling catheter device 40 and the above-described intravascular indwelling catheter device 30 is that the inner needle assembly on which the catheter assembly is mounted in advance is moved by the locking mechanism 11 to the storage member 8. Is attached to the vicinity of the distal end of the housing member 8 and applies an attractive force in a state of pulling the inner needle hub 6 toward the rear end of the storage member 8 in the storage member 8. An attractive force applying mechanism 41 for urging in the end direction is provided.
Is that a cap 23 for enclosing the catheter assembly is attached to the tip of. By being formed in this way, the operation of moving the catheter assembly 4 and the inner needle assembly 7 to the distal end side of the storage member 22 during use becomes unnecessary. The cap 23 covers the distal end side operation portion 11g of the locking mechanism 11 so as to disable the operation of the locking mechanism 11, and fixes the locking mechanism 11.

The catheter assembly 40 of this embodiment has one end fixed to the rear end 33 of the inner needle hub 6 and the other end closed similarly to the catheter assembly 30 described above.
An elastic member 31 fixed to 4 is provided, and the elastic member 31 is in a stretched state. The inner needle 5 is stored in the storage member 8 after use by the restoring force of the elastic member 31. . As the elastic member 31, a spring member such as a coil spring as shown in FIG. 14 is preferable, but a rubber member such as a string or a rod may be used. In this device 40 as well, if the blood vessel securing during use is not successful and the inner needle assembly is temporarily stored in the storage member until the blood vessel securing operation is performed again, the cylindrical protrusion 61 By pressing the rear end of the inner needle assembly 7 toward the distal end,
A force for pulling the inner needle hub 6 toward the rear end of the storage member 8 can be applied to the elastic member 31 again.

Next, a method of using the catheter device for indwelling in a blood vessel of the present invention will be described with reference to FIGS. In order to use the catheter device 1 for indwelling in a blood vessel, first, from the state shown in FIG. 3, the pressing member 62 provided at the rear end of the cylindrical projection 61 of the inner needle hub 6 is pushed, and the catheter hub 3 is mounted. The inner needle assembly 7 is moved in the distal direction, and the catheter assembly 4 and a part of the inner needle assembly 7 are projected from the distal opening 8a of the storage member 8. During this operation, the lower end of the locking portion 11b abuts on the outer surface of the catheter hub 3, and the locking mechanism 11 is pushed upward as the catheter hub 3 moves toward the distal end. Therefore,
The operation of the operation unit 11e is unnecessary.

When the pressing member 62 is further pushed forward, the rear end surface of the engaging portion 11b of the locking mechanism 11 is brought into contact with the distal end surface of the second enlarged diameter portion 6d of the inner needle hub 6, as shown in FIG. The contact makes it impossible to move any further to the distal end side. Then, when the pressing force is reduced or the pressing is stopped in this state, the catheter assembly 4 and the inner needle assembly 7 are slightly moved by the suction force of the reduced pressure space formed inside the storage member 8 as shown in FIG. Move backward. In this state, as shown in FIG. 8, which is a cross-sectional view taken along line CC of FIG.
The distal end surface of the inner needle hub 6 and the upper rear end surface of the first enlarged diameter portion 6c of the inner needle hub 6 abut, and the catheter assembly 4 and the inner needle hub 6 are locked near the distal end of the storage member 8. The locking mechanism 11
Since the protruding portion 11a is located inside the catheter hub 3 as shown in FIG.
Even if f is pressed, the lock is not released. As will be described later, the catheter hub can be easily detached from the inner needle hub with a force enough to be pushed with the index finger. This is to facilitate the indwelling operation. For this reason, the blood vessel securing at the time of use does not work well, and until the blood vessel securing work is performed again, when temporarily storing the inner needle assembly in the storage member, the catheter hub is pushed slightly forward, Further, by pressing the pressing portion 11f, the inner needle assembly on which the catheter assembly is mounted can be easily stored in the storage member. Then, by pressing the rear end portion 62 of the cylindrical projection 61 of the inner needle hub 6 again to cause the inner needle portion of the inner needle hub to protrude from the storage member, it is possible to mount the catheter assembly again. is there.

Then, the storage member 8 of the catheter device 1 for indwelling in a blood vessel in the state shown in FIG. Then, the tip of the catheter 2 is positioned in the vein. The securing of the vein can be confirmed by the blood flowing from the rear end of the inner needle into the cylindrical projection of the inner needle hub. Then, FIG.
As shown in the figure, the catheter assembly 4 is pushed forward with the forefinger in the distal direction to disengage from the inner needle assembly 7, and at the same time,
Hold the catheter 2 with the other hand to prevent blood from flowing out.
Then, necessary connectors or tubes are attached to the rear end opening of the catheter assembly 4.

On the other hand, when the catheter assembly 4 is detached from the inner needle assembly 7, the inner needle 5 presses the rear end pressing portion 11 f of the locking mechanism 11 with the thumb, so that the inner needle 5 is in the storage member 8. Is automatically stored in the storage member 8 by the suction force of the reduced pressure space formed in the storage member 8. As described above, the catheter device for indwelling in a blood vessel of the present invention allows the inner needle assembly to automatically move in the rear end direction inside the storage member only by a very simple operation of unlocking the inner needle hub by the locking mechanism. It is easy to operate because it is moved and stored, and blood infection of a medical technician can be more reliably prevented.

Next, the catheter device 70 for indwelling in a blood vessel shown in FIG. 15 will be described. The only difference between this device 70 and the above-described catheter device 1 for indwelling in a blood vessel is the structure of the pressing member attached to the rear end of the cylindrical projection, and only that point will be described. In the catheter device 70 for indwelling in a blood vessel, the pressing member 72 is detachably attached to the rear end of the cylindrical projection 61. The pressing surface (rear end surface) of the pressing member 72 is a closed surface. Instead, the pressing member 72 is formed in a hollow shape, and an opening 73 that communicates the internal space with the outside is formed on the side surface.
As shown in FIGS. 15 and 16, the pressing member 72 is provided with a mounting portion 71 at the center to the rear end of the cylindrical projecting portion. Further, the radius of the semicircular enlarged diameter portion 74 of the cylindrical protrusion forming the mounting portion 71 is substantially equal to the radius of the distal end opening of the storage member 8. For this reason, the pressing member detached from the cylindrical projection can be attached to the distal end opening of the storage member. That is, the pressing portion can be used as a tip sealing member of the storage member. Thereby, it is possible to more reliably prevent the protrusion of the inner needle and the scattering of blood. Note that the prevention of the protrusion of the inner needle is not limited to such a method, and a member (e.g., the cylindrical protrusion) that is mounted between the rear end of the cylindrical member 8 and the pressing member to suppress the movement of the cylindrical protrusion. (A gutter-like member that can be attached from the side surface of

The lock release suppressing mechanism is not limited to the one described in the above embodiment. For example, as shown in FIG. 18, the catheter hub is provided with a rod-shaped projection 3c projecting rearward from the rear end thereof.
The first locking portion 11b may be provided with a hole through which the projection 3c passes. Also in the device shown in FIG. 18, when the locking mechanism 11 is pressed in a state where the catheter assembly is mounted, the projection 3 c contacts the upper inner surface of the hole of the locking portion 11 b of the locking mechanism 11, and further. The locking mechanism cannot be pressed.

[0047]

According to the present invention, there is provided a catheter apparatus for indwelling an intravascular catheter, comprising: a catheter assembly comprising a catheter for indwelling an intravascular vessel, and a catheter hub fixed to a proximal end portion of the catheter for indwelling an intravascular vessel; An inner needle assembly including an inner needle having a puncture blade surface protruding from the catheter at the distal end thereof, and an inner needle hub fixed to a proximal end of the inner needle; A catheter member for accommodating the catheter assembly mounting portion of the inner needle assembly equipped with a catheter assembly, wherein the inner needle hub is slidable within the accommodating member. And, extending to the rear end side, the inside communicates with the internal space of the inner needle, the rear portion includes a cylindrical projecting portion projecting from the storage member, the catheter device for indwelling the blood vessel,
Push the rear end of the cylindrical protrusion of the inner needle hub toward the distal end, and with the catheter protruded from the storage member, move the inner needle hub of the inner needle assembly to the distal end of the storage member. It has a locking mechanism for releasably locking in the vicinity and an airtight holding member for forming a decompression space in the storage member by moving the inner needle hub toward the distal end.

Therefore, after the catheter device for indwelling in a blood vessel is indwelled in a blood vessel of a patient, the inner needle assembly can be stored in the storage member only by a very simple operation of releasing the locking of the inner needle hub by the locking mechanism. The operation is easy because it is automatically moved and stored in the direction of the inner rear end, and blood infection of a medical technician can be more reliably prevented. Preparation for puncturing can be performed by pushing the rear end of the cylindrical projection, and operation with one hand is also possible. Further, even if the inner needle assembly is temporarily stored in the storage member until the blood vessel securing operation is not performed properly and the blood vessel securing operation is performed again, the cylindrical protrusion of the inner needle hub is again used. By pushing the rear end portion toward the front end side, it is possible to return to a state where the indwelling operation can be performed.

The catheter device for indwelling an intravascular catheter according to the present invention includes a catheter assembly comprising an intravascular indwelling catheter, a catheter hub fixed to a proximal end of the intravascular indwelling catheter, and the catheter assembly. The catheter assembly comprises an inner needle having a puncture blade surface protruding from the catheter at a distal end thereof, and an inner needle hub fixed to a proximal end of the inner needle. And a storage member capable of storing at least the blade surface portion of the inner needle of the inner needle assembly, wherein the inner needle hub is provided inside the storage member. The inner catheter is provided with a tubular protrusion that extends to the rear end side, communicates with the internal space of the inner needle, and has a rear end protruding from the storage member. The device is A lock mechanism for releasably locking the inner needle hub of the assembly near the distal end of the storage member, wherein the catheter has protruded from the storage member by the lock mechanism. Locked in a state, the inside of the storage member is a decompression space, and the attractive force by the decompression space, when unlocking the locking mechanism,
The inner needle can be stored in the storage member up to the blade surface portion, and the intravascular indwelling catheter device further includes an airtight holding member for maintaining the airtightness of the reduced pressure space. I have.

Therefore, there is no need to move the inner needle assembly with the catheter assembly to the distal end side of the storage member at the time of use, and the catheter assembly for indwelling the blood vessel is indwelled in the blood vessel of the patient. Then, only by a very simple operation of releasing the lock of the inner needle hub by the locking mechanism, the inner needle assembly automatically moves toward the rear end inside the storage member and is stored, so that the operation is easy, The blood infection of the technician can be more reliably prevented. Then, even if the inner needle assembly is temporarily stored in the storage member until the blood vessel securing at the time of use is not successful and the blood vessel securing work is performed again, the cylindrical protrusion of the inner needle hub is again used. By pushing the rear end portion toward the front end side, it is possible to return to a state where the indwelling operation can be performed.

Further, the catheter device for indwelling in a blood vessel according to the present invention comprises a catheter assembly comprising a catheter for indwelling in a blood vessel, a catheter hub fixed to a proximal end of the catheter for indwelling in a blood vessel, and the catheter assembly. An inner needle assembly including an inner needle having a puncture blade surface protruding from the catheter at the distal end thereof, and an inner needle hub fixed to a proximal end of the inner needle; A catheter member for accommodating the catheter assembly mounting portion of the inner needle assembly equipped with a catheter assembly, wherein the inner needle hub is slidable within the accommodating member. And a tubular projecting portion extending to the rear end side, the inside of which communicates with the internal space of the inner needle, and a rear portion protruding from the storage member. Hub The inner needle hub of the inner needle assembly can be released near the distal end of the storage member in a state where the rear end of the cylindrical protrusion is pushed toward the distal end and the catheter is protruded from the storage member. A locking mechanism for locking, and a pulling force applying mechanism for applying a force for pulling the inner needle hub toward the rear end of the storage member, which is generated by the movement of the inner needle hub in the distal direction. .

Therefore, after the catheter device for indwelling in a blood vessel is indwelled in the blood vessel of a patient, the inner needle assembly can be stored in the storage member only by a very simple operation of releasing the locking of the inner needle hub by the locking mechanism. The operation is easy because it is automatically moved and stored in the direction of the inner rear end, and blood infection of a medical technician can be more reliably prevented. Preparation for puncturing can be performed by pushing the rear end of the cylindrical projection, and operation with one hand is also possible. Further, even if the inner needle assembly is temporarily stored in the storage member until the blood vessel securing operation is not performed properly and the blood vessel securing operation is performed again, the cylindrical protrusion of the inner needle hub is again used. By pushing the rear end portion toward the front end side, it is possible to return to a state where the indwelling operation can be performed.

The catheter device for indwelling the blood vessel according to the present invention comprises a catheter assembly comprising a catheter for indwelling the blood vessel, a catheter hub fixed to the proximal end of the catheter for indwelling the blood vessel, and the catheter assembly. The catheter assembly comprises an inner needle having a puncture blade surface protruding from the catheter at a distal end thereof, and an inner needle hub fixed to a proximal end of the inner needle. And a storage member capable of storing at least the blade surface portion of the inner needle of the inner needle assembly, wherein the inner needle hub is provided inside the storage member. The inner catheter is provided with a tubular protrusion that extends to the rear end side, communicates with the internal space of the inner needle, and has a rear end protruding from the storage member. The device is A lock mechanism for releasably locking the inner needle hub of the assembly near the distal end of the storage member, wherein the catheter has protruded from the storage member by the lock mechanism. Further, the catheter device for indwelling in a blood vessel pulls the inner needle hub toward the rear end of the storage member, and releases the blade of the inner needle when the locking mechanism is unlocked. Having an attractive force applying mechanism for applying an attractive force to be stored in the storage member up to the surface portion, and further pressing the rear end of the cylindrical protrusion toward the front end after the attractive force applying mechanism has lost the attractive force. By
Attraction can be generated by the attraction applying mechanism.

Therefore, there is no need to move the inner needle assembly with the catheter assembly attached to the distal end side of the storage member at the time of use, and the catheter assembly for indwelling in a blood vessel is indwelled in the blood vessel of a patient. Then, only by a very simple operation of releasing the lock of the inner needle hub by the locking mechanism, the inner needle assembly automatically moves toward the rear end inside the storage member and is stored, so that the operation is easy, The blood infection of the technician can be more reliably prevented. Also, if the blood vessel securing during use does not work well and the inner needle assembly is temporarily stored in the storage member until the blood vessel securing work is performed again, the cylindrical protrusion of the inner needle hub again occurs. By pushing the rear end of the part toward the front end side, it is possible to return to the state where the indwelling operation can be performed.

Further, in the catheter device for indwelling in a blood vessel, the catheter assembly may be mounted on the inner needle assembly, and the inner needle hub may be locked by the locking mechanism. If the locking mechanism has an unlocking suppression mechanism that abuts when unlocking operation of the locking mechanism is performed and suppresses unlocking, locking is performed while the catheter assembly is mounted. Since the locking of the mechanism cannot be released, the locked state will not be released even if the locking mechanism is accidentally touched.

[Brief description of the drawings]

FIG. 1 is a front view of an embodiment of a catheter device for indwelling in a blood vessel according to the present invention.

FIG. 2 is a plan view of the intravascular indwelling catheter device shown in FIG. 1;

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a right side view of the intravascular indwelling catheter device shown in FIG. 1;

FIG. 5 is an exploded view of the intravascular indwelling catheter device shown in FIG. 1;

6 is a cross-sectional view of the intravascular indwelling catheter device shown in FIG. 1 during a catheter indwelling operation.

FIG. 7 is a sectional view taken along line BB of FIG. 6;

FIG. 8 is a sectional view taken along line CC of FIG. 6;

FIG. 9 is an explanatory diagram for explaining the operation of the intravascular indwelling catheter device of the present invention.

FIG. 10 is a cross-sectional view of the intravascular indwelling catheter device of the present invention with the catheter assembly detached.

FIG. 11 is a cross-sectional view of a state where the inner needle portion of the inner needle hub from which the catheter assembly has been detached is housed in the housing member.

FIG. 12 is a sectional view of another embodiment of the intravascular indwelling catheter device of the present invention.

FIG. 13 is a cross-sectional view of another embodiment of the intravascular indwelling catheter device of the present invention.

FIG. 14 is a cross-sectional view of another embodiment of the intravascular indwelling catheter device of the present invention.

FIG. 15 is a cross-sectional view of another embodiment of the intravascular indwelling catheter device of the present invention.

FIG. 16 is a front view of a pressing member having a cap function used in the intravascular indwelling catheter device shown in FIG. 15;

FIG. 17 is a left side view of the pressing member shown in FIG. 16;

FIG. 18 is a cross-sectional view of another embodiment of the intravascular indwelling catheter device of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1, 20, 30, 40, 70 Intravascular indwelling catheter device 2 Intravascular indwelling catheter 3 Catheter hub 4 Catheter assembly 5 Inner needle 5a Puncture blade surface 6 Inner needle hub 61 Cylindrical protrusion 62 Pressing member 63 Filter 7 Inner Needle Assembly 8 Storage Member 9 Engagement Unit 11 Locking Mechanism 12 Airtight Holding Member 31 Attraction Applying Mechanism

Claims (11)

[Claims] 1. A catheter assembly comprising an intravascular indwelling catheter, a catheter hub fixed to a proximal end portion of the intravascular indwelling catheter, and a catheter assembly which is removably inserted into the catheter assembly and is inserted into a distal end. An inner needle assembly including an inner needle having a puncture blade surface protruding from the catheter, an inner needle hub fixed to a proximal end of the inner needle, and the inner needle assembly mounted with the catheter assembly A catheter device for indwelling a blood vessel, comprising a storage member storing the catheter assembly mounting portion, wherein the inner needle hub is slidable in the storage member, and extends to a rear end side and a rear portion. Is provided with a cylindrical protruding portion that protrudes from the storage member, and the intravascular indwelling catheter device pushes the rear end of the cylindrical protruding portion of the inner needle hub toward the distal end, and moves the catheter from the storage member. Protruded In this state, a locking mechanism for releasably locking the inner needle hub of the inner needle assembly near the distal end of the storage member, and a movement of the inner needle hub toward the distal end side allows the storage member to move. An intravascular indwelling catheter device, comprising: an airtight holding member for forming a decompression space therein. 2. A catheter assembly comprising an intravascular indwelling catheter, a catheter hub fixed to a proximal end of the intravascular indwelling catheter, a removably inserted catheter assembly, and a distal end. An inner needle assembly comprising an inner needle having a puncture blade surface protruding from the catheter, and an inner needle hub fixed to a proximal end of the inner needle, the inner needle assembly having the catheter assembly attached thereto, and the inner needle An intravascular indwelling catheter device comprising a storage member capable of storing at least the blade surface portion of the inner needle of the assembly, wherein the inner needle hub is slidable in the storage member, and has a rear end. A tubular protrusion extending rearward and having a rear end protruding from the storage member, wherein the intravascular indwelling catheter device can release the inner needle hub of the inner needle assembly near the distal end of the storage member. Locking mechanism for locking The inner needle assembly is locked by the locking mechanism in a state where the catheter protrudes from the storage member, and the storage member has a decompression space, and the decompression space. Can be stored in the storage member up to the blade surface portion of the inner needle when the locking mechanism is unlocked, and the intravascular indwelling catheter device is airtight in the decompression space. An intravascular indwelling catheter device, comprising an airtight holding member for maintaining airtightness. 3. A catheter assembly comprising an intravascular indwelling catheter, a catheter hub fixed to a proximal end of the intravascular indwelling catheter, and a catheter assembly which is removably inserted into the catheter assembly and is inserted into a distal end. An inner needle assembly including an inner needle having a puncture blade surface protruding from the catheter, an inner needle hub fixed to a proximal end of the inner needle, and the inner needle assembly mounted with the catheter assembly A catheter device for indwelling a blood vessel, comprising a storage member storing the catheter assembly mounting portion, wherein the inner needle hub is slidable in the storage member, and extends to a rear end side and a rear portion. Is provided with a cylindrical protruding portion that protrudes from the storage member, and the intravascular indwelling catheter device pushes the rear end of the cylindrical protruding portion of the inner needle hub toward the distal end, and moves the catheter from the storage member. Protruded A locking mechanism for releasably locking the inner needle hub of the inner needle assembly near the distal end of the storage member, and the inner needle generated by the distal movement of the inner needle hub. A catheter for indwelling the blood vessel, the mechanism including an attractive force applying mechanism for applying a force for pulling the needle hub toward the rear end of the storage member. 4. A catheter assembly comprising an intravascular indwelling catheter, a catheter hub fixed to a proximal end of the intravascular indwelling catheter, a removably inserted catheter assembly, and a distal end. An inner needle assembly comprising an inner needle having a puncture blade surface protruding from the catheter, and an inner needle hub fixed to a proximal end of the inner needle, the inner needle assembly having the catheter assembly attached thereto, and the inner needle An intravascular indwelling catheter device comprising a storage member capable of storing at least the blade surface portion of the inner needle of the assembly, wherein the inner needle hub is slidable in the storage member, and has a rear end. A tubular protrusion extending rearward and having a rear end protruding from the storage member, wherein the intravascular indwelling catheter device can release the inner needle hub of the inner needle assembly near the distal end of the storage member. Locking mechanism for locking The inner needle assembly, the catheter is locked by the locking mechanism in a state where the catheter protrudes from the storage member, further, the intravascular indwelling catheter device, the inner needle hub is the A pulling mechanism for pulling in the rear end direction of the storage member and applying an attractive force for storing the inner needle up to the blade surface portion in the storage member when unlocking the locking mechanism, The catheter for indwelling in a blood vessel, wherein the attraction force can be generated by the attraction force mechanism by pushing the rear end of the cylindrical protrusion toward the front end side after the attraction force of the attraction mechanism disappears. apparatus. 5. The catheter device for indwelling in a blood vessel according to claim 1, wherein the airtight holding member is an annular elastic member provided on an outer surface of the inner needle hub and in contact with an inner surface of the storage member. 6. The intravascular indwelling catheter device includes a second airtight holding member provided on an inner surface of the storage member and in contact with an outer surface of the cylindrical protrusion of the inner needle hub. The catheter device for indwelling in a blood vessel according to claim 1 or 2. 7. The catheter device for indwelling in a blood vessel, wherein the catheter assembly is mounted on the inner needle assembly, and the inner needle hub is locked by the locking mechanism. The catheter device for indwelling in a blood vessel according to any one of claims 1 to 6, further comprising a lock release suppressing mechanism that abuts upon locking release operation of the locking mechanism and suppresses lock release. 8. The lock release suppressing mechanism is a protrusion provided on the lock mechanism and penetrating into the catheter hub when the inner needle hub to which the catheter assembly is mounted is locked. The catheter device for indwelling in a blood vessel according to claim 7. 9. The locking release suppressing mechanism is provided on the locking mechanism and a protrusion protruding from a rear end of the catheter hub, and locks the inner needle hub to which the catheter assembly is mounted. The catheter device for indwelling in a blood vessel according to claim 7, wherein the catheter device is a hole for accommodating a projection of the catheter hub. 10. The intravascular indwelling device according to claim 1, wherein a pressing member having a flat rear end surface is provided at a rear end of the cylindrical protrusion of the inner needle hub. Catheter device. 11. The inner part of the cylindrical projection communicates with the inner space of the inner needle.
The catheter device for indwelling in a blood vessel according to any one of the above.