JPH0724071A - Blood vessel indwelling catheter - Google Patents

Abstract

PURPOSE:To provide the blood vessel indwelling catheter of which the work to store the inner needle in protective mechanism is easy and the stored inner needle including the protective mechanism is not so bulky, and the stored inner needle has least danger to stick out and can be abolished in safety. CONSTITUTION:This blood vessel indwelling catheter assembly comprises a catheter assembly 2, an inner needle assembly 3, an inner needle assembly storing member 4 and an inner needle assembly transferring member 5. The transferring member 5 is detachably attached to the inner needle assembly 3 and stored slidably in the storing member 4 in condition the rear end 52 is projecting. The inner needle assembly transferring member 5 is detachable from the inner needle assembly 3 in condition the inner needle assembly 3 is stored in the inner needle assembly storing member 4.

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 assembly that is temporarily placed in a blood vessel for blood transfusion, liquid transfusion, or the like. More specifically, the present invention relates to an intravascular indwelling catheter assembly having an inner needle needle storing function capable of storing an inner needle that is removed after venipuncture of a patient.

[0002]

BACKGROUND OF THE INVENTION Many intravascular indwelling catheter assemblies have been used in the past. As an intravascular indwelling catheter assembly, an intravascular indwelling catheter, a catheter assembly having a catheter hub fixed to the proximal end portion of the catheter, and a catheter assembly that is detachably inserted,
And an inner needle assembly having an inner needle having a puncture blade surface at the tip and an inner needle hub fixed to the base end of the inner needle and engaging with the rear end of the catheter hub. Is common. The intravascular indwelling catheter assembly is used for hemodialysis, blood transfusion, infusion and the like. In use, first, the indwelling catheter assembly in which the catheter assembly and the inner needle assembly are integrated is punctured into the blood vessel (for example, intravenously) of the patient, and then only the inner needle is pulled out to leave the remaining catheter assembly. A connector such as a blood transfusion set (or an infusion set) is connected to the assembly, and the target blood (or drug solution) is administered into the body.

[0003] Then, medical technicians are required to more surely prevent infection with infectious diseases such as AIDS and hepatitis. However, with this intravascular indwelling catheter,
The inner needle assembly must be removed while the intravascular catheter has been inserted into the patient, and the catheter inserted into the patient must be held so that it will not come off the blood vessel, and for that purpose, fixing work such as applying tape Since it is necessary, it is not possible to pay much attention to the inner needle to be removed. Therefore, it is said that the inner needle is left with the patient's blood or the like attached to the tip of the inner needle, and after the above-mentioned catheter fixing work is completed, the inner needle is covered with a cap or the like and discarded. Is common. However, when removed, placed on a table, or dropped on the floor or the like, it may cause blood infection, and there is also a risk of piercing a finger with an exposed inner needle. Therefore, recently, an intravascular indwelling catheter assembly provided with a protection mechanism for the inner needle has been proposed. Specifically, there are U.S. Pat. No. 4,950,252 and U.S. Pat. No. 5,000,740. These are capable of moving the inner needle portion to the rear end side, and have an inner needle storage portion that stores the moved inner needle.

[0004]

However, in the above-mentioned U.S. Patents, the tip portion of the inner needle protection portion that must be held and the inner needle attachment portion that must be operated to move backward. It is not easy to operate because it is close to and requires some training. In addition, the indwelling catheter may be mistakenly removed from the blood vessel during the inner needle storage operation, and further, the inner needle may be removed from the indwelling catheter before the inner needle is completely stored in the inner needle storage section. is there. Further, in the case of US Pat. No. 4,950,252, the inner needle mounting portion projects rearward, so that when it is discarded, it is bulky and a locking portion is provided. However, there is a risk that the inner needle will re-project when pushed. Therefore, an object of the present invention is to facilitate the work of storing the inner needle in the protection mechanism, and further, to dispose the inner needle including the protection mechanism, which is not so bulky and can be easily discarded. I will provide a.

[0005]

The object of the present invention is to achieve the above object, and a catheter assembly comprising an intravascular indwelling catheter and a catheter hub fixed to a proximal end portion of the intravascular indwelling catheter, and the catheter. An inner needle assembly comprising an inner needle having a puncturing blade surface projecting from the catheter at the tip, and an inner needle hub fixed to the base end portion of the inner needle; An inner needle assembly moving member removably attached to the inner needle hub of the inner needle assembly, and a slidable inner needle assembly moving member, and a rear end portion of the moving member protruding. An inner needle assembly accommodating member for accommodating the inner needle assembly inside for moving the moving member toward the rear end side, and further for moving the inner needle assembly. In the member, the inner needle assembly is inside the inner needle assembly accommodating member. In a retracted state, it is intravascular indwelling catheter assembly can be detached from the inner needle assembly.

The inner needle assembly moving member and the inner needle assembly accommodating member are engaged with each other by an engaging portion (engaging portion at the time of puncturing) which engages with the moving member accommodated in the accommodating member. ) Are preferred. The inner needle assembly and the inner needle assembly housing member each have an engaging portion (discarding engagement portion) that engages with the inner needle assembly housed in the housing member. Is preferred. The inner needle assembly housing member,
It is preferable that the front end portion has a mounting portion at the rear end portion of the inner needle hub. A rear end portion of the inner needle assembly and a front end portion of the inner needle assembly moving member have an engaging portion (moving member connecting mechanism) that engages when the front end portion is inserted into the rear end portion. It is preferable to have.

Therefore, the intravascular indwelling catheter assembly of the present invention will be described with reference to the embodiment shown in the drawings. Figure 1
FIG. 2 is a schematic front view of an embodiment of the intravascular indwelling catheter assembly of the present invention, FIG. 2 is a plan view of an embodiment of the intravascular indwelling catheter assembly of the present invention, and FIG. A-
It is a vertical sectional view taken along line A.

The intravascular indwelling catheter assembly 1 of the present invention comprises a catheter assembly 2 including an intravascular indwelling catheter 21 and a catheter hub 22 fixed to the proximal end of the intravascular indwelling catheter 21. , The catheter assembly 2 is detachably inserted, and the catheter 22 is attached to the tip.
An inner needle 31 having a piercing blade surface protruding further, and an inner needle 31
An inner needle assembly 3 including an inner needle hub 32 fixed to a proximal end portion of the inner needle assembly 3, an inner needle assembly moving member 5 detachably attached to the inner needle assembly 3, and an inner needle assembly moving member. The member 5 is housed slidably and with the rear end portion 52 of the moving member 5 protruding, and the inner needle assembly 3 is housed inside for moving the moving member 5 to the rear end side. Inner needle assembly storage member 4
Further, the inner needle assembly moving member 5 has the inner needle assembly 3 housed in the inner needle assembly housing member 4,
It can be detached from the inner needle assembly 3.

The intravascular indwelling catheter assembly 1 of the present invention
Is composed of a catheter assembly 2, an inner needle assembly 3, an inner needle assembly moving member 5, and an inner needle assembly housing member 4. The catheter assembly 2 includes a catheter 21 temporarily placed in a blood vessel, and a catheter hub 22 fixed to a rear end portion of the catheter 21. The catheter hub 22 is detachably attached to the tip portion of the inner needle assembly 3 to be described later, and is detachably attachable to the attachment portion 45 provided to the tip portion of the inner needle housing portion 4 to be described later. have. The catheter hub 22 is used as a connector for connecting to a drug solution injection line when injecting a drug solution or the like after the inner needle 31 is removed. The rear end of the catheter hub 22 is an opening 22b. The distal end portion of the inner needle hub of the inner needle assembly 3 can be inserted through the opening 22b.

The molding material for the catheter 21 is PT
A tube formed of a fluororesin such as FE, ETFE, FEP, PFA, etc., an olefin resin such as polypropylene, polyethylene, etc., and having some flexibility is suitable. The outer diameter of the catheter is 0.6 to
It is generally about 2.2 mm. The length is 15 to 15.
It is generally about 65 mm. The catheter hub 22 is preferably transparent enough to allow the inflow of the drug solution and blood to be confirmed. Further, as a material for forming the catheter hub, thermoplastic synthetic resins such as polypropylene, polyethylene, polycarbonate and polystyrene can be used, and in particular, the above-mentioned resins having a certain degree of transparency are suitable. The catheter 21 and the catheter hub 22 may be fixed with an adhesive, a solvent or the like, but it is preferable not to use such an adhesive if possible, and a metal pipe shorter than the rear end of the catheter 5 is inserted, It is preferable to fix by caulking using this metal pipe.

Further, ribs 23a and 23b are preferably formed on the outer surface of the rear end of the catheter hub 22, as shown in FIG. The ribs 23a and 23b are in contact with the inner surface of the mounting portion 45 of the inner needle assembly accommodating member material 4 described later so that the catheter hub 22 can be removably mounted on the mounting portion 45. Further, the mounting portion 45 of the storage member material 4
Due to the step portion 41 formed on the inner surface of the rib 23,
a and 23b are locked, and the catheter hub 22 moves along with the movement of the inner needle assembly 3 in the axial rear end direction (moving the inner needle assembly 3 into the storage member material 4). 4 is configured so as not to move inside. Specifically, when the inner needle assembly 3 is stored inside the inner needle storage member 4, the rib 23
The rear end surfaces of a and 23b abut the catheter hub locking portion 41 formed on the rear portion of the inner surface of the mounting portion 45 so that the catheter assembly 2 does not move further in the rear end direction. In this embodiment, as shown in FIG. 4, it is preferable that two ribs 23a and 23b are provided on the outer surface of the rear end of the catheter hub 22 so as to project in the direction perpendicular to the axial direction and face each other.

As shown in FIG. 1, the inner needle assembly 3 is composed of an inner needle 31 and an inner needle hub 32 fixed to its rear end. The inner needle 31 has a puncture blade surface at its tip, and further has a length that allows the inside of the catheter 21 to be inserted so that this blade surface projects from the tip of the catheter 21. In addition, the inner needle assembly 3 is, as shown in FIG.
It is stored in a storage member 4 described later. Inner needle 3
1 is for introducing the indwelling catheter 21 into the blood vessel of a patient, and a hollow needle made of stainless steel or the like can be preferably used. Then, the tip portion of the inner needle hub 32 has a shape that can engage with the rear end portion of the catheter hub 22 or enter the rear end portion of the catheter hub. Further, inside the inner needle hub 32, a blood inflow chamber 32a for confirming that the inner needle 31 has entered the blood vessel of the patient is formed. The blood inflow chamber 32a is a space for accommodating blood that flows in when the inner needle 31 punctures a patient's vein. The inner needle hub preferably has a certain degree of transparency so that the inflow of blood into the blood inflow chamber 32a can be confirmed. Further, in the blood inflow chamber 32a, a filter 37 that allows air to pass therethrough and does not allow blood and bacteria to pass therethrough.
Is preferably provided. As the filter 37, a three-dimensional object formed of a porous material, a film-shaped object formed of a porous film, a non-woven fabric, or the like can be used. In particular, a cylindrical material formed of a sintered material to be porous is preferable. Also, the catheter assembly 2
When the inner needle assembly 3 is inserted through the rear end opening 22a,
The rear end of the catheter hub 22 abuts on the stepped portion 36 of the inner needle hub 32, and the tip of the inner needle 31 has a predetermined length of the catheter 2
It projects from the tip of 1. In this embodiment, the step portion 36
Is formed near the tip of the inner needle assembly 3, as shown in FIG. 4, and the rear end surface of the catheter hub 22 abuts against this abutting portion 36 during insertion, so that it cannot be inserted any further. Is formed in.

The inner needle 31 and the inner needle hub 32 may be fixed with an adhesive, a solvent or the like, but it is preferable that such an adhesive is not used. It is preferable to fix by induction heating using a plastic material. Further, as shown in FIGS. 4 and 9, the inner needle hub 32 of the inner needle assembly 3 of this embodiment engages with the inner needle assembly housing member 4, and the inner needle housed in the housing member 4. Storage member engaging portion 33 for preventing movement of the assembly 3
In order to move the inner needle assembly 3 into the accommodating member 4 with the movement of the moving member 5 by engaging the (disassembly engaging mechanism on the assembly side) with the connecting portion 50 of the member 5 for moving the inner needle assembly. Of the moving member connecting portion 35. And the inner needle hub 3
No. 2 storage member engaging portion 33 (engagement mechanism at the time of disposal on the assembly side)
Is composed of a protrusion 33a which is a rear end direction movement preventing means and a protrusion 33b which is a tip end direction movement preventing means, and the moving member connecting portion 35 is constituted by the first connecting portions 35a, 3a.
5b and the contact portion 36. These will be described later.

After the puncture, the inner needle storage member 4 is inserted into the inner needle assembly 3
For accommodating the inner needle assembly 3, and is formed by a cylindrical body having a length capable of accommodating at least the inner needle 31. The storage member 4 of this embodiment has a catheter hub mounting portion 45, a grip portion 42 for gripping when the indwelling catheter assembly is punctured, and an inner needle storage space 47. Then, as shown in FIGS. 4, 5, 6, 9, and 10, the inner needle storage member 4 engages with the inner needle assembly 3 described above, and the inner needle stored in the storage member 4 is accommodated. With the inner needle assembly engaging portion 44 (moving member side discarding engagement mechanism) for preventing the movement of the assembly 3 and the inner needle assembly moving member 5 housed, the inner needle assembly engaging portion 44 and the moving member are engaged with each other. It has a moving member engaging portion 40 (engagement mechanism on the accommodation member side when puncturing) that fits. Further, the storage member 4 has a catheter hub locking portion 41 provided in the mounting portion 45, a slit 43, and a protrusion 46, and the mounting portion 45 also serves as a mounting portion for the cap 6. The inner needle assembly engagement portion 44 (disposing mechanism on the storage member side) is configured by the rear end direction movement prevention portion 44a and the tip end direction movement prevention portion 44b. Further, the engaging portion 40 that engages with the moving member 5 (engagement mechanism at the time of puncturing on the storage member side) has an opening portion (enlargement portion) 40 that engages with a protrusion 51 provided on the moving member 5 described later. It is configured. Further, the rear end 49 of the storage member 4 functions as a front end direction locking portion of the moving member 5.

The mounting portion 45 is for mounting the cap portion 6 for protecting the inner needle 31 and the catheter hub 22 in a state before use. In this embodiment, as shown in FIG.
A cap portion 6 is formed on the outer peripheral portion of the member 5 so that the cap portion 6 can be attached and detached, and that the cap portion 6 can be attached so as not to be easily detached by a slight vibration generated during transportation. Furthermore, the catheter assembly 2 is formed on the inner peripheral portion so that the catheter assembly 2 can be attached and detached and not easily detached by a slight vibration generated during transportation. Then, the mounting portion 45 allows the catheter assembly 2 to be easily detached after puncturing the patient.
It has a cutout portion 45a. The catheter hub locking portion 41 is for locking the catheter assembly 2 so as not to move inside the inner needle housing member 4 as the inner needle assembly 3 moves in the axial rear end direction. Therefore, in this embodiment, as shown in FIGS. 3 and 4, the locking portion 41 is formed by the stepped portion provided on the inner peripheral surface of the mounting portion 45. Then, as described above, this catheter hub locking portion 41
The ribs 23a and 23b of the catheter assembly 2 are in contact with the rear end surfaces of the catheter assembly 2 so that the catheter assembly 2 does not move into the inner needle housing member 4.

The grasping portion 42 is a portion for grasping with a finger when the intravascular indwelling catheter assembly is punctured into a patient, and the surface of the grasping portion 42 is slipped as shown in FIG. An uneven portion is formed to prevent the stop. Furthermore, after the indwelling catheter assembly is punctured, when the inner needle assembly 3 is moved in the axial rear end direction while the catheter assembly 2 is held so as not to be detached from the blood vessel of the patient, the inner needle housing member 4 is It is also used during gripping to prevent movement toward the rear end. In this example, FIG.
As shown in FIG. 3, gripping portions 42 a and 42 b that can be held are formed near the tip of the storage member 4. When the inner needle assembly 3 is housed in the housing member 4, the grip portion 42a,
42b is clamped with fingers, and the inner needle assembly moving member 5 is pulled toward the rear end to be stored. Further, as shown in FIG. 1, the inner needle accommodating member 4 has a protrusion 46 on the outer peripheral surface near the rear end, which allows the orientation of the blade surface of the inner needle to be confirmed, and You can hook your fingers during storage work, and the work becomes easier. Further, as shown in FIG. 6, the storage member 4 has an inner needle storage space 47 for storing the inner needle assembly 3 therein. The inner needle storage member 4
As a material for forming the resin, a thermoplastic synthetic resin such as polypropylene, polyethylene, polycarbonate, or polystyrene can be used. In particular, the above-mentioned resin having a certain degree of transparency is preferable.

The inner needle assembly moving member 5 is for moving the inner needle assembly 3 in the axial rear end direction when the inner needle assembly 3 is housed in the housing member 4 after puncturing. . As shown in FIGS. 2, 4 and 10, the inner needle assembly moving member 5 of this embodiment includes a moving member connecting portion 35 provided at the rear end of the inner needle assembly 3 described above, Inner needle assembly connecting portion 50 that is detachably engaged, and storage member engagement portion 51 that engages with the storage member 4 when stored in the storage member 4 (moving member side puncture engagement mechanism) have. Further, the inner needle assembly moving member 5 is, as shown in FIGS. 2, 4 and 10, an operation portion for releasing the engagement of the engaging portion 51 and moving the moving member to the rear end side. 52, an inner needle insertion port 54,
It has a rear end 49 of the storage member 4 and a front end surface 57 of the operation portion that restricts the movement of the moving member toward the front end.
The storage member engaging portion 51 is composed of protrusions 51a and 51b, and the operating portion 52 is composed of rear end portions 52a and 52b of two projecting pieces that can be pressed so that they can approach each other. Further, the inner needle assembly connecting portion 50 is for detachably connecting the inner needle assembly moving member 5 and the inner needle assembly 3, and in this embodiment, as shown in FIG. The needle assembly moving member 5 is formed by a protruding portion provided at the tip of the member 5. As a molding material for the inner needle assembly housing member 4 and the inner needle assembly moving member 5, a thermoplastic synthetic resin such as polypropylene, polyethylene, polycarbonate or polystyrene can be used.

Next, the engaging mechanism of the inner needle assembly 3, the inner needle assembly housing member 4, and the inner needle assembly moving member 5 will be described. First, the engagement mechanism between the inner needle assembly 3 and the inner needle assembly housing member 4 will be described. The engagement mechanism of both is a discarding engagement mechanism, and this engagement mechanism includes a storage member engagement portion 33 provided in the inner needle assembly 3 and an assembly engagement portion provided in the storage member 4. And 44. The discarding engagement mechanism is for preventing movement of the inner needle assembly 3 housed in the housing member 4 at the time of disposal, and is a rear end direction movement preventing means and a tip end direction movement preventing means of the inner needle assembly. Have means. At the time of puncturing, the state is as shown in FIGS. 1, 2 and 3, and the inner needle 31 of the inner needle assembly 3 is wholly protruded from the tip of the inner needle assembly accommodating member 4 and the inner needle hub. 32 also protrudes, and is in a state of being accommodated in the accommodating member 4 except the tip of the inner needle hub. The catheter assembly 2 is fitted on the inner needle assembly. As shown in FIG. 4, the inner needle assembly 3 constitutes an engaging portion 33 (an assembly-side discarding engagement mechanism) for engaging with the inner needle assembly housing member 4.
Has three protrusions 33a and 33b, and also has a storage member 4
Is provided at the rear end portion of the slit 43 that constitutes the assembly engaging portion 44 (accommodation mechanism at the time of discarding the storage member) and the slit 43 in which the two protrusions 33a and 33b are movable, and is partially slit. Engaging portion 44 which is a narrowed portion having a narrow width
have. When the engaging portion 44 is inserted between the two protrusions 33a and 33b, both are engaged. At the time of puncturing, as shown in FIGS. 2 and 3, the two protrusions 33a and 33b are located on the tip side of the slit 43, and the engaging portion 44 and the protrusions 33a and 33b are not engaged.

The inner needle assembly 3 is movable rearward in the inner needle assembly accommodating member 4, and the inner needle assembly 3 has the slit 43 of the moving member 4 and the protrusion 33a penetrating the slit 43. , 33b so that the storage member 4 does not rotate.
It is stored in. The engagement mechanism will be specifically described. The protrusion 33a and the narrow portion 44 constitute a rear end direction movement preventing means. This rear end direction movement preventing means is
After the puncture, when the inner needle assembly 3 is housed in the inner needle housing member 4 and the inner needle assembly moving member 5 to be described later is pulled in the axial rear end direction, the inner needle assembly 3 Is prevented from coming off from the rear end of the inner needle storage member 4. In this embodiment, as shown in FIGS. 2, 3 and 9, the narrow portion 44
Is located between the two protrusions 33a and 33b, so that the rear end side face of the protrusion 33a and the front end side face 4 of the narrow portion are
4a and the inner needle assembly 3 come into contact with each other to suppress the movement of the inner needle assembly 3 in the axial rear end direction.

Further, the protrusion 33b and the narrow portion 44 constitute a tip end direction movement preventing means. This tip-direction movement preventing means stores the inner needle assembly 3 in the inner needle storage member 4 after the puncture and after the puncture, and then the inner needle assembly 3 receives the inner needle storage member 4.
This is for preventing the movement of the axial direction of the. This is to prevent movement in the direction opposite to the above-mentioned rear end direction movement preventing means. In this example, FIG.
As shown in FIGS. 3 and 9, the narrow portion 44 is located between the two protrusions 33a and 33b, so that the protrusion 33b
The side surface of the inner needle assembly 3 comes into contact with the side surface 44a of the narrowed portion on the rear end side to suppress the movement of the inner needle assembly 3 in the axial distal direction.
Further, as shown in FIGS. 2, 3 and 9, the protrusion 33b is provided on the outer surface of the upper portion of the inner needle hub 32, and is formed so that the shape viewed from above is a triangular prism having a vertex at the rear portion. It is preferable. By doing so, the narrow portion 44 of the slit 43 can easily enter between the two protrusions 33a and 33b. As described above, the intravascular indwelling catheter assembly 1 of the present invention has the bidirectional movement prevention mechanism, so that the inner needle assembly 3 does not jump out of the storage member 4 after the disposal, which is safer. Is.
In addition, in this embodiment, the tip end direction movement preventing means 34 is
Although it is formed behind the rear end direction movement preventing means 33,
It may be provided in front of the rear end direction movement prevention means 33, or the rear end direction movement prevention means 33 and the front end direction movement prevention means 34 may be formed by one convex portion.

Next, the engagement mechanism between the inner needle assembly 3 and the inner needle assembly moving member 5 will be described. The engagement mechanism of both is a coupling mechanism for moving the inner needle assembly 3 in the rearward direction of the storage member 4 in conjunction with the movement of the moving member 5. The moving member connecting portion 35 (assembly side connecting mechanism) of the inner needle hub 32 is for detachably connecting the inner needle assembly 3 and the inner needle assembly moving member 5, and in this embodiment, As shown in FIG. 2 or 4, the inner needle assembly 3
Two convex portions 35 protruding from the rear portion toward the rear end direction
a, 35b. In other words, the inner needle assembly connecting portion 50 of the inner needle assembly moving member 5 is formed between the two protruding pieces 35a and 35b, which is formed by a holding portion that can hold the protruding portion 50 of the moving member 4. It is formed so as to be inserted from the rear and pinched. Further, the projecting pieces 35a, 35b have two projecting portions 37a, 37b projecting inward. Protrusions 37a, 37
b enters the recess 55 provided at the rear end portion of the inner needle assembly connecting portion 50, and when the inner needle assembly moving member 5 is moved in the axial rear end direction, it is connected to the moving member connecting portion 35. This prevents the connection with the inner needle assembly connecting portion 50 from being easily disconnected. That is, the tip side surfaces of the protrusions 37a and 37b come into contact with the side surfaces of the recess 55 of the inner needle assembly moving member 5, so that the inner needle assembly 3 and the inner needle assembly moving member 5 are connected to each other. It is designed so that it does not come off when moved in the axial direction.

The moving member connecting portion 35 and the inner needle assembly connecting portion 50 are connected by moving the connecting portion 50 of the inner needle assembly moving member 5 in the vertical direction (in this embodiment, in the upward direction in FIG. 7). It can be canceled by moving to). In this embodiment, as shown in FIG. 2, the slit 43 of the storage member 4 is
Is formed in the axial direction up to the rear end except for the vicinity of the front end where the cap mounting portion 45 described later is present. Further, the rear end of the slit 43 has a width that allows the connecting portion 50 of the inner needle assembly moving member 5 to pass through when separating the inner needle assembly 3 and the inner needle assembly moving member 5 at the time of disposal. When the connection between the moving member connecting portion 35 and the inner needle assembly connecting portion 50 is released, the moving member connecting portion 50 is made to pass through the rear end portion of the slit 43. Thus, the intravascular indwelling catheter assembly 1 of the present invention
When the inner needle assembly 3 is stored in the storage member 4 and discarded, the inner needle assembly moving member 5 protruding from the rear end of the storage member 4 can be removed, so that the inner needle assembly 3 can be discarded without being bulky. Further, in this embodiment, as described above, since the inner needle assembly 3 is prevented from rotating inside the storage member 4, the connection between the moving member connecting portion 35 and the assembly connecting portion 50 is prevented. It will be easy.

Next, the engagement mechanism between the inner needle assembly housing member 4 and the inner needle assembly moving member 5 will be described. Both engaging mechanisms are puncturing engaging mechanisms. This engaging mechanism allows the moving member 5 to move to the rear end side with respect to the storage member 4, that is, at the time of puncturing, by puncturing resistance, It is an engaging portion that prevents the inner needle from moving to the rear end side, and it is also preferable to prevent the movement of the moving member 4 to the front end side. The moving member 5 and the housing member 4 have a puncturing engagement mechanism that engages when the moving member 5 is housed in the housing member 5. In this embodiment, the engaging mechanism is a slit. Four
3, the enlarged portion 40, the operation portion of the moving member 4, the protrusion 51a,
It is composed of 51b. More specifically, as shown in FIGS. 4, 5, 6, and 10, the moving member 5 includes an operating portion 52 at the rear end and two protrusions provided on the tip side of the operating portion 52. It has 51a and 51b. Further, the housing member 4 has an enlarged portion 40 at the rear end portion of the slit 43 for housing the above-mentioned two protrusions 51a and 51b. Then, the rear end side surface 4 of the enlarged portion 40 of the slit 43
0a, 40b and the two protrusions 5 that have entered this enlarged portion
Together, 1a and 51b prevent the inner needle assembly moving member 5 from moving toward the rear end before use and during puncturing, as shown in FIG. That is, the protrusions 51a, 51 are formed on the side surfaces 40a, 40b of the enlarged portion 40 of the moving member.
b is contacted, and the inner needle assembly moving member 5 is prevented from moving toward the rear end before use and during puncturing.

Further, in this embodiment, as shown in FIG. 2, with the protrusions 51a and 51b of the moving member entering the enlarged portion 40 of the slit 43, the rear end 49 of the storage member 4 is Since the distal end surface 57 of the operating portion 52 of the moving member 5 is formed so as to abut, the inner needle assembly 3 and the inner needle assembly moving connected to the inner needle assembly 3 before use and at the time of puncturing. The working member 5 is also prevented from moving in the axial tip direction. The operation portion 52 provided at the rear end of the moving member 5 has a function for releasing the engagement between the above-described protrusions 51a and 51b and the enlarged portion 40 of the slit 43, and the moving member 5. It functions as a grip when moving in the rear end direction. Specifically, as shown in FIGS. 2, 4, and 10, the operation portion 52 projects from the rear end of the storage member 4 with the moving member 5 stored in the storage member 4. The operating portion 52 is the member 5 for moving the inner needle assembly.
The rear end portion is formed by two rear end portions of the projecting pieces that are provided so as to project in the rear end direction. The protrusions 51a and 51b are located on the tip side of the operation portion 52, and
The two projections 51a and 51b are formed on the upper surfaces of the two protruding pieces so that the two projections 51a and 51b are formed in the slit 4
It is possible to enter the enlarged section 40 of No. 3.

When the inner needle assembly 3 is housed in the housing member 4 after puncturing, the two projecting pieces are deformed by pinching the operating portions 52a and 52b, and the distance between the two projecting pieces, In other words, it is formed so that the gap between the protrusions 51a and 51b can be narrowed, and inside the slit 43 extending to the rear of the enlarged portion 40 (the gap between the rear end direction locking portions 40a and 40b). ) To the protrusion 51a,
The inner needle assembly moving member 5 can be moved in the rear end direction by passing through 51b. In other words, in this embodiment, the operating portion 52 has the protrusion 51.
The engagement release function is configured to release the engagement between the a and 51b and the enlarged portion 40 of the slit 43. Then, the operation unit 52
As shown in FIGS. 4 and 5, is composed of two pieces 52a and 52b for sandwiching. In addition, this operation unit 52
As shown in FIGS. 2 and 4, it is preferable that an uneven portion for preventing slippage is formed on the surface of the.

Further, as shown in FIGS. 9 and 4, the distal end portion and the intermediate portion of the moving member 5 can be inserted from the distal end side opening of the accommodating member 4 accommodating the inner needle assembly 3,
Further, it preferably has an inner needle insertion port 54 and is hollow. As described above, by allowing the inner needle 31 housed in the housing member 4 to be inserted into the inner needle assembly moving member 5, it is possible to further prevent the blood attached to the inner needle 31 from being exposed to the outside. In addition, the moving member 5 separated from the inner needle assembly 3 can be discarded together. Specifically, the inner needle assembly moving member 5 releases the connection between the connecting portion 35 and the connecting portion 50 to separate it from the inner needle assembly 3, and then, as shown in FIG. The distal end portion of the moving member 5 (on the side where the inner needle insertion port 54 is provided) is placed in the storage member 4
The inner needle 31 is inserted into the inner needle assembly moving member 5 through the insertion port 54, and the inner needle 31 is housed in the inner needle assembly moving member 5. As a result, it is possible to further prevent the blood attached to the inner needle 31 from being scattered or exposed to the outside after the disposal.

Next, a method of assembling the intravascular indwelling catheter assembly 1 of the present invention will be described with reference to FIG. In order to assemble the intravascular indwelling catheter assembly 1 of the present invention, first, the inner needle assembly 3 having the inner needle 31 is inserted through the opening 22a formed at the rear end of the catheter assembly 2. For this insertion, the rear end face of the catheter assembly 2 is
The process is performed until the abutting portion 36 of the inner needle assembly 3 is abutted and locked. At this time, the inner needle 31 penetrates through the catheter 21,
The distal end portion of the catheter 21 is projected from the distal end portion by a predetermined length. Next, the inner needle assembly 3 with the catheter assembly 2 attached is inserted into the opening of the distal end portion of the storage member 4 from the rear end portion. In this insertion, the ribs 23a and 23b formed on the rear end of the catheter assembly 2 are formed on the inner surface of the housing member 4, and the catheter hub locking portion 41 is formed.
Until it touches and locks.

Further, the inner needle assembly moving member 5 is inserted from the rear end of the housing member 4, and the moving member connecting portion 35 of the inner needle assembly 3 and the inner needle assembly connecting portion 50 of the moving member 5 are inserted. Connect and. In this connection, the inner needle assembly connecting portion 50 is positioned behind the moving member connecting portion 35, and the operating portion 52 is connected.
By lightly pressing a and 52b, they are easily connected. In this state, the protrusions 51a and 51b of the moving member 5 are located inside the enlarged portion 40 of the slit 43 of the housing member 4, and the protrusions 51a and 51b and the rear end side surface of the enlarged portion 40 are in contact with each other. , The rear end 4 of the storage member 4
9 and the distal end surface 57 of the operating portion 52 are also in contact with each other and are in a fixed state. Therefore, the inner needle assembly 3 and the inner needle assembly moving member 5 are axially moved by the extent of vibration generated during transportation or the like. Do not move. Then, the cap 6 is mounted on the outer peripheral portion of the mounting portion 45, and the assembly is completed. As described above, the intravascular indwelling catheter assembly of the present invention can be easily assembled only by moving each part in the axial direction.

[0029]

Next, the operation of the intravascular indwelling catheter assembly of the present invention will be described with reference to FIGS. It should be noted that FIGS. 5 to 8 are shown upside down from the actual use state in order to make the operation of the intravascular indwelling catheter assembly 1 of the present invention easier to understand. Then, in order to use the intravascular indwelling catheter assembly 1 of the present invention,
First, the inner needle 3 that holds the grip portions 42a and 42b of the storage member 4 with fingers and projects a predetermined length from the distal end portion of the catheter 21.
1 is punctured into the vein of the patient, and the tip of the catheter 21 is positioned inside the vein. At this time, the puncture of the inner needle 31 into the vein of the patient is confirmed by the inflow of blood into the blood inflow chamber 32a of the inner needle assembly 3.

The left hand holds the catheter 21 and the storage member 4, and if necessary, the catheter 21
Is temporarily fixed with tape, and then, as shown in FIG.
The operating parts 52a and 52b of the member 5 for moving the inner needle assembly are clamped by fingers (not shown) of the right hand (compressing from the vertical direction in FIG. 5).
At the same time, it is moved in the axial rear end direction (rightward in FIG. 5). Along with this, the inner needle 31 that penetrates the inside of the catheter and is punctured into the vein of the patient moves inside the catheter 21 toward the rear end, and is withdrawn from the catheter 21. In this state, the operating portions 52a and 52b are pinched, so that the distance between the protrusions 51a and 51b serving as the locking means is narrowed, and the protrusions 51a and 51b are enlarged.
Since it can pass through the slit 43 portion on the rear end side of 0, the inner needle assembly moving member 5 can move in the rear end direction. FIG. 5 shows a state in which the protrusions 51 a and 51 b are disengaged from the enlarged portion 40 and the protrusions 51 a and 51 b are located near the rear end of the slit 43. Then, the operating portions 52a and 52b of the inner needle assembly moving member 5 are clamped, and
Move it toward the rear end until the state shown in is reached. As a result, the inner needle 31 that has punctured the vein of the patient is housed in the housing member 4, so that blood attached to the inner needle 31 can be prevented from being exposed to the outside. In the intravascular indwelling catheter assembly 1, the work of removing the inner needle 31 from the catheter assembly 1 and the work of housing the inner needle assembly 3 in the inner needle assembly housing member 4 can be performed simultaneously. Therefore, the work is easy, and further, the puncture blade surface of the inner needle 3 is prevented from being substantially exposed, and the blood adhered to the inner needle is not scattered even when the inner needle assembly is stored. .

In the inner needle assembly 3, the narrow portion 44 of the slit 43 is located between the protrusion 33a which is the rear end direction movement preventing means and the protrusion 33b which is the tip end direction movement preventing means, and the inner needle assembly 3 is shown in FIG. As shown, they are in engagement. Therefore, the inner needle assembly 3 is fixed to the storage member 4,
It does not move in the axial direction. In this way, the intravascular indwelling catheter assembly of the present invention has a mechanism that does not easily come off after the inner needle assembly 3 is housed in the housing member 4, so it is safer to discard. Next, the catheter assembly is removed from the mounting portion 45. At this time, the mounting portion 4
Since 5 has the cutout portion 45a, the catheter assembly 2 can be easily removed from the cutout portion 45a. Then, the catheter 21 is attached to the patient with tape or the like. Further, the rear end opening 2 of the catheter hub 22
A tube (not shown) for injecting the drug solution or the like is connected to 2a to inject the drug solution or the like.

On the other hand, the accommodating member 4 and the inner needle assembly moving member 5 in a state in which the catheter assembly 2 is removed and the inner needle assembly 3 is housed are the inner needle assembly connecting portion 5 of the moving member 5.
By moving 0 downward (upward in FIG. 7),
The connection between the two is released, and further, as shown in FIG. 8, the tip side of the inner needle assembly moving member 5 is inserted through the tip opening of the storage member 4, and the inner needle 31 is moved. The inner needle insertion port 54 is discarded and discarded. in this way,
Since the intravascular indwelling catheter assembly 1 of the present invention can house the inner needle 31 in the housing member 4, it can be positioned in the inner needle assembly moving member 5.
It is possible to further prevent the blood attached to the inner needle 31 from being scattered or exposed to the outside after the disposal.

[0033]

The catheter assembly for intravascular indwelling according to the present invention includes a catheter assembly comprising an intravascular indwelling catheter and a catheter hub fixed to the proximal end of the intravascular indwelling catheter; An inner needle assembly comprising an inner needle having a puncturing blade surface projecting from the catheter at the tip, and an inner needle hub fixed to the base end portion of the inner needle; An inner needle assembly moving member removably attached to the inner needle hub of the inner needle assembly, and a slidable inner needle assembly moving member, and a rear end portion of the moving member protruding. An inner needle assembly accommodating member for accommodating the inner needle assembly inside thereof when the inner needle assembly is accommodated therein by further moving to the rear end side of the moving member, and further, the inner needle assembly moving member. Means that the inner needle assembly is inside the inner needle assembly housing member. Since it is an intravascular indwelling catheter assembly that can be detached from the inner needle assembly in the stored state, the rear end of the moving member and the distal end of the storage member are separated by a distance longer than the length of the inner needle. Since the storage member and the catheter assembly can be held by one hand and the rear end of the moving member can be operated by the other hand, the inner needle assembly can be moved into the storage member. Is easy. further,
The work of removing the inner needle from the catheter assembly and the work of accommodating the inner needle assembly in the inner needle assembly accommodating member can be performed at the same time, so the work is easy and the puncture blade surface of the inner needle is substantially It is also prevented from being exposed, and the blood adhered to the inner needle does not scatter even when the inner needle assembly is stored. Furthermore, since the member for moving the inner needle assembly can be removed after the inner needle assembly is housed in the housing member, the housing member at the time of discarding substantially houses the inner needle assembly inside. However, since the entire length is not so different from the length of the storage member, it is not so long and can be easily discarded.

[Brief description of drawings]

FIG. 1 is a schematic front view of one embodiment of the intravascular indwelling catheter assembly of the present invention.

FIG. 2 is a plan view of one embodiment of the intravascular indwelling catheter assembly of the present invention.

FIG. 3 is a vertical sectional view taken along the line AA of FIG.

FIG. 4 is an explanatory view for explaining a method for assembling the intravascular indwelling catheter assembly of the present invention.

FIG. 5 is an explanatory view for explaining the operation of the intravascular indwelling catheter assembly of the present invention.

FIG. 6 is an explanatory view for explaining the action of the intravascular indwelling catheter assembly of the present invention.

FIG. 7 is an explanatory view for explaining the operation of the intravascular indwelling catheter assembly of the present invention.

FIG. 8 is an explanatory view for explaining the action of the intravascular indwelling catheter assembly of the present invention.

FIG. 9 is an explanatory view for explaining the operation of the intravascular indwelling catheter assembly of the present invention, particularly the operation of the engaging mechanism at the time of discarding the inner needle assembly and the inner needle assembly accommodating member. is there.

FIG. 10 is a view for explaining the action of the intravascular indwelling catheter assembly of the present invention, in particular, the action of the puncture engagement mechanism of the inner needle assembly moving member and the inner needle assembly accommodating member. FIG.

[Explanation of symbols]

 1 Intravascular Indwelling Catheter Assembly 2 Catheter Assembly 21 Catheter 22 Catheter Hub 3 Inner Needle Assembly 31 Inner Needle 32 Inner Needle Hub 32a Blood Inflow Chamber 33 Disposal Engagement Mechanism 33a Projection 33b Projection 35 Moving Member Connecting Portion 4 Needle storage member 40 Enlarged portion (storage member engaging portion) 41 Catheter hub locking portion 42 Gripping portion 43 Slit 44 Inner needle assembly engaging portion (narrow portion) 45 Mounting portion 45a Cutout portion 46 Protruding portion 5 Inner needle assembly Member for three-dimensional movement 50 Inner needle assembly connection part 51a Projection 51b Projection 52 Operation part 54 Inner needle insertion port 6 Cap

Claims (1)

[Claims] 1. A catheter assembly including an intravascular indwelling catheter and a catheter hub fixed to a proximal end portion of the intravascular indwelling catheter; An inner needle assembly having an inner needle having a puncture blade surface protruding from the catheter and an inner needle hub fixed to a proximal end portion of the inner needle; and an inner needle assembly detachably attached to the inner needle assembly. The member for moving the inner needle assembly and the member for moving the inner needle assembly are slidably housed in a state in which the rear end portion of the moving member is projected, and further to the rear end side of the moving member. An inner needle assembly accommodating member for accommodating the inner needle assembly inside the inner needle assembly accommodating member, wherein the inner needle assembly moving member is an inner needle assembly accommodating member. It can be detached from the inner needle assembly when it is stored in An intravascular catheter assembly characterized by the following.