JP2003175112A - Indwelling needle structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an indwelling needle structure capable of safely treating a used stylet even without requiring a skill in an indwelling needle having a branch and used for a transfusion or a dialysis. <P>SOLUTION: This indwelling needle structure comprises an indwelling needle body (10), the stylet (20) for assuring a communicating state with the body (10) by capturing a patient's blood vessel, and a stylet container (30) for housing the stylet (20) after the stylet captures the blood vessel. The stylet (20) has an extrafine pipe-like stylet (21) made of a metal disposed at the inside of an outer needle (11), and a slider (22) fixedly supporting a root at the stylet (21) and projectable and retractable in a main passage (13) for feeding a transfusion liquid to the outer needle. The stylet container (30) has a housing cylinder (31) for housing the stylet (20), an energizing means (32) fixed to the slider (22) to move the stylet (20) into the cylinder (31) from the state that the stylet is internally mounted in the needle body (10), a stopper for maintaining the stylet (20) in the state in which the stylet (20) is internally mounted in the body (10) against the energizing force of the means (32), and a trigger (34) for releasing the stopper. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to the structure of an indwelling needle that is used by puncturing a blood vessel and indwelling it, for example, used for infusion or artificial dialysis.

[0002]

[Prior Art] There are typically the following two types of means for forming an infusion or dialysis line. The first means is a winged needle with a metal needle, a tube for connecting an infusion or dialysis line, and a wing formed of a flexible material to aid in fixation to the patient's skin. Is the means used. This winged needle has a problem in that, during infusion or dialysis, a metal needle in the blood vessel that is punctured may damage the blood vessel due to the movement of the arm or may break the blood vessel. For this reason, it may be unsuitable for long-term use or may be limited in intended users.

The second means is to use an ordinary indwelling needle. This requires skill in the operation of not dripping blood from the opening at the rear end of the indwelling needle after the inner needle is removed after puncturing the patient. Further, since the blood of the patient adheres to the inner needle removed from the patient, it is necessary to be skilled in that the inner needle must be disposed of without touching the needle tip in order to prevent infections and the like. Although the skill is required, the burden on the patient is small, so that the rate of using the second method is increasing.

By searching the prior patent applications, the following two cases could be extracted. This is shown in FIGS. 8 and 9. In the invention disclosed in Japanese Unexamined Patent Publication No. 10-179734 shown in FIG. 8, in a tube (7) forming a branch flow channel, an inner needle (2) for puncturing at one of the branches is used as an outer needle (4).
In addition to advancing and retreating, the flow path for infusion is secured. That is, at the proximal end of the inner needle (8), a filter member (plug 6) that allows gas to permeate but does not allow liquid to permeate is set, and the infusion solution is not waited for until the blood is filled in the indwelling needle after puncture. Can be primed (a state in which the indwelling needle is filled). Therefore, the time for forming the indwelling needle line can be shortened, and the work can be easily concentrated, which contributes to lowering the probability of occurrence of accidents such as contamination with bacteria or displacement or detachment of the indwelling needle from the blood vessel. In addition, there is also a structural feature that the presence of the filter member (6) does not cause blood dripping from the opening at the rear end of the indwelling needle.

The invention disclosed in Japanese Unexamined Patent Publication No. 2000-217925 shown in FIG. 9 is a winged indwelling puncture needle having a branch pipe (5). Also in this invention, the inner needle (2) for puncturing is advanced and retracted on one side of the branch pipe (5), and the infusion passage is secured on the other side. Further, it is provided with a protection cap (6) for protecting the used inner needle (2) after puncturing. Therefore, it is possible to reduce the probability of a needle stick accident due to the inner needle pulled out from the patient.

[0006]

[Patent Document 1] Japanese Patent Application Laid-Open No. 10-1797
In the invention disclosed in No. 34, the treatment of the used inner needle after puncture is not particularly considered. Therefore,
A certain degree of skill is required to safely handle the used inner needle while performing the work of forming a line for infusion or dialysis.
Further, in the invention disclosed in Japanese Patent Laid-Open No. 2000-217925, the volume of the blood channel for confirming that the blood vessel is captured is relatively large, and the retention of blood or infusion becomes a problem.
That is, the retention of blood may induce the coagulation of blood and the growth of bacteria, and the retention of infusion may cause waste of the infusion and may not be expected to be effective. Further, the outer needle (4) in the invention disclosed in JP-A-10-179734 and the branch pipe (5) in the invention disclosed in JP-A-2000-217925 are made of Teflon (registered trademark) or urethane. As it is adopted, it is opaque. Therefore, it is not possible to confirm that the blood vessel has been captured simply by puncturing the inner needle.

The problem to be solved by the present invention is to provide an indwelling needle having a branch and capable of safely processing a used inner needle without skill even in the case of infusion or dialysis. To do. The object of the invention described in claims 1 to 7 is to provide an indwelling needle having a branch and used for infusion or dialysis, which can safely process a used inner needle without requiring skill. Is to provide the structure. It is an object of the inventions of claims 8 to 10 to further provide an indwelling needle structure capable of confirming capture of a blood vessel as soon as possible.

[0008]

In order to solve the above problems, the present application provides the inventions according to claims 1 to 7.

(Claim 1) An indwelling needle body (10) for communicating a blood vessel of a patient with an infusion solution, and an inside for securing a communication state between the indwelling needle body (10) by capturing the blood vessel of the patient. Needle body (20)
And an inner needle housing (30) for housing the inner needle body (20) after capturing the blood vessel. Indwelling needle body (10)
Is a pipe-shaped outer needle (11) communicating with the cylindrical main passage (13) and the internal space of the main passage (13) and protruding from the tip thereof.
And a branch passage (14) connected and branched so as to communicate with the main passage (13) in order to send the infusion solution into the outer needle (11). The inner needle body (20) supports and fixes the inner needle (21) in the form of a metal ultrafine pipe located inside the outer needle (11) and the root portion of the inner needle (21), and the main path (13). ) Inside slider
(22) is provided. The inner needle storage body (30) includes a storage cylinder (31) for storing the inner needle body (20) from the side opposite to the outer needle (11) in the main path (13) of the indwelling needle body (10), and an indwelling needle body (30). An urging means (32) fixed to the slider (22) for moving the inner needle body (20) from the state of being installed in the inside of the storage cylinder (31) to the inner needle body (20). The indwelling needle provided with a stopper for maintaining the state of being installed in the indwelling needle body (10) against the urging force of the urging means (32) and a trigger (34) for releasing the stopper. Related to the structure.

(Operation) For the indwelling needle body (10), the inner needle
Position (21) inside the outer needle (11) and slide the slider (22)
The inner needle body (20) is assembled so that it can be moved back and forth within the (13). With respect to the inner needle body (20), the inner needle body (20) is kept inside the indwelling needle body (10) by a stopper against the biasing force of the biasing means (32). Assemble the inner needle container (30) so that the trigger (34) for releasing the stopper is in a functional state.

When the inner needle (21) and the outer needle (11) are punctured by the patient to capture a blood vessel, the blood of the patient flows into the inner needle (21). Therefore, the trigger (34) is activated. Then, the inner needle body
The stopper for maintaining the state that (20) is installed in the indwelling needle body (10) against the biasing force of the biasing means (32) is released, and the slider ( 22) is the main road
The inside needle body (20) is moved back into the inside of the storage cylinder (31) by retreating inside the (13). Then, the inner needle (22) is pulled out from the inner side of the outer needle (11). At this point, the probability of occurrence of a needle stick accident due to the inner needle (21) can be reduced.

The blood that has flowed into the inner needle (21) is the inner needle body (20).
Moves into the barrel of the storage barrel (31) and moves from the inside of the outer needle (11) to the inner needle.
As (22) is pulled out, it flows into the inside of the outer needle (11). On the other hand, the infusion solution is fed from the branch passage (14) of the indwelling needle body (10) and communicates with the main passage (13). Here, it becomes possible to deliver the infusion solution into the blood vessel of the patient via the outer needle (11) and the branch passage (14).

(Claim 2) The invention according to claim 2 limits the indwelling needle structure according to claim 1, wherein the inner needle container (30) is a tip of the inner needle (21) once housed. The present invention relates to an indwelling needle structure provided with a re-exposure prevention mechanism for preventing exposure of the needle.

(Operation) With respect to the inner needle (21) once stored in the inner needle storage body (30), the re-exposure preventing mechanism prevents the tip of the inner needle (21) from being exposed. Here, the probability of occurrence of a needle stick accident due to the inner needle (21) can be further reduced.

(Claim 3) The invention according to claim 3 restricts the indwelling needle structure according to claim 2, and a trigger is provided.
(34) is an engaging portion (3) that engages with the slider (22) of the inner needle body (20).
4a) and a lever portion (34c) for releasing the engagement by the engaging portion (34a) by the action of gripping, the re-exposure prevention mechanism is such that the lever portion (34c) has the engaging portion (34a). The present invention relates to an indwelling needle structure including a closing piece (31a) that operates in conjunction with an operation of releasing the engagement and closes the storage cylinder (31).

(Action) The engaging portion (34a) engages with the slider (22) of the inner needle body (20) to resist the urging force of the urging means (32), and the indwelling needle main body (10). Stay in the interior. Then, when the capture of the blood vessel is completed, the lever portion (34c)
The engagement by the engagement part (34a) is released by gripping. At this time, the re-exposure prevention mechanism has its lever (34c)
It operates in conjunction with and closes the storage cylinder (31). For this reason,
By performing the operation of releasing the engagement by the engagement portion (34a), the closing piece (31a) closes the storage cylinder (31) and the tip of the inner needle (21) can be prevented from being exposed.

(Claim 4) The invention according to claim 4 limits the indwelling needle structure according to any one of claims 1 to 3, wherein the outer needle (11) faces toward the tip. The present invention relates to an indwelling needle structure which is provided with a tip portion (11c) whose outer diameter is narrowed down and which is formed of a material having a light-transmitting property that allows blood to be captured.

(Operation) Since the tip portion (11c) of the outer needle (11) has a shape in which the outer diameter is narrowed toward the tip and is light-transmissive, the tip portion (11c) can be applied to a patient during puncture. Since the load can be reduced and the volume of the gap between the outer needle (11) and the inner needle (21) is reduced, it is possible to quickly recognize that the blood vessel has been captured.

(Claim 5) The invention according to claim 5 limits the indwelling needle structure according to any one of claims 1 to 4, and secures communication with the branch passage (14). While having a cylindrical seal member (16) for closing the main passage (13), the seal member (16) is related to an indwelling needle structure formed of a material having a self-closing property.

(Explanation of terms) "Self-closing" means a thin and hard material, for example, a soft material that allows a needle to penetrate therethrough, and the through hole is closed when the penetrated needle is removed. It means the property that ends up. Specific materials are, for example, silicone rubber, urethane, butyl rubber and the like. (Operation) The seal member (16) has a self-closing property.
Therefore, leakage of blood through the seal member (16) can be prevented. By using such a material,
The number of members for assembling the indwelling needle structure can be reduced and the structure can be simplified.

(Claim 6) The invention according to claim 6 limits the indwelling needle structure according to any one of claims 1 to 5, and is an intermediate portion of the inner needle (21) in the longitudinal direction. In regard to the indwelling needle structure provided with the lateral hole (21b) communicating with the pipe in the longitudinal direction.

(Operation) Blood flowing into the inner needle (21) after the inner needle (21) captures the blood vessel of the patient overflows from the lateral hole (21b) and the outer needle (11) and the inner needle (21). Since it flows out into the gap between and, it is possible to quickly see that the blood vessel has been captured.

(Claim 7) The invention according to claim 7 limits the indwelling needle structure according to any one of claims 1 to 6, and includes an indwelling needle main body (10) and an inner needle body ( 20) and the inner needle container (30) are assembled, the inner needle (2
1) and a protective cap (40) to protect the outer needle (11),
The protective cap (40) relates to an indwelling needle structure including an engaging structure that is detachably engaged with the indwelling needle body (10) and the inner needle housing (30) that are engaged with each other. (Function) The protective cap (40) protects the inner needle (21) and the outer needle (11) in a state where the inner needle body (20) and the inner needle container (30) are assembled, and therefore, before use. The state can be kept clean. Further, since the indwelling needle body (10) and the inner needle housing (30) that are engaged with each other have an engaging structure that is detachably engaged, even if the protective cap (40) is removed before use. It does not affect the engagement state of the indwelling needle body (10) and the inner needle housing (30).

(Claim 8) The invention according to claim 8 limits the indwelling needle structure according to any one of claims 1 to 7, wherein the outer needle is made of a transparent thermoplastic material. The present invention relates to an indwelling needle structure manufactured by extrusion molding a resin.

As the "translucent thermoplastic resin",
Specific examples include polyester-based polyethylene terephthalate (PET), polyethylene naphthalate, polyolefin-based cyclic olefin copolymers, and non-crystalline cycloolefin polymers. In consideration of the dimensional accuracy of the outer diameter and the inner diameter and the ease of obtaining the finished product, the most suitable material was amorphous PET. For example, when the condition is "90% or more" as the total light transmittance according to the measuring method ASTM D1003, it can be used with almost the same feeling as that of colorless transparent glass.

(Claim 9) The invention according to claim 9 limits the indwelling needle structure according to claim 8, and relates to the indwelling needle structure in which the inner wall of the outer needle is coated with a blood coagulating agent. . This is because, if blood retention occurs for some reason, it may induce blood coagulation or bacterial growth, and suppress it.

(Claim 10) The invention according to claim 10 is
The indwelling needle structure according to claim 7 or claim 8 is limited, and the outer needle is related to the indwelling needle structure subjected to a wettability improving treatment. This is because it is necessary to capture blood as quickly as possible in order to prevent inconveniences such as coagulation, and the “wetting property improving treatment” that enhances the capillary force is effective.

The "wettability improving treatment" is a treatment for increasing the speed of capillary action in order to quickly suck up blood, for example, a low temperature plasma treatment. "This plasma low temperature treatment creates an atmosphere of plasma by discharge in an environment decompressed at room temperature, and the strong kinetic energy of the charged particles in the plasma is greater than the potential energy of the Coulomb force acting between particles. The chemical bond of the surface layer is cleaved, and active oxygen in the atmosphere is bonded to the molecule of the surface layer by utilizing the large size, and a highly hydrophilic functional group (eg, -OH, -CHO, -COOH). Is used to modify the surface layer of the product.

[0029]

DETAILED DESCRIPTION OF THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a three-dimensional view showing an indwelling needle main body, FIG. 2 is a three-dimensional view showing a storage mechanism, and FIG. 3 is a three-dimensional view showing a state in which the above-mentioned two parts are combined. Is a diagram useful for understanding.

(Overall Structure) The indwelling needle assembly according to the present embodiment is used to establish a communication state with the indwelling needle body 10 for communicating the blood vessel of the patient with the infusion solution, and capturing the blood vessel of the patient. The inner needle body 20 for securing the inner needle body 20 for accommodating the inner needle body 20 after capturing the blood vessel, and the protective cap 40 for protecting the indwelling needle body 10 before use are formed. .

(Indwelling needle main body 10) As shown in FIG. 1, the indwelling needle main body 10 communicates with a cylindrical main passage 13 which is pre-drawn and communicates with an inner space of the main passage 13 at an intermediate position in the longitudinal direction of the main passage 13. A branch passage 14 connected and branched as described above, an outer needle 11 projecting from the narrowed tip of the main passage 13, and a wing member 12 that assists in fixing the indwelling needle body 10 to the patient's body.
It has and. Further, an engaged portion 10a which is a circumferential groove for engaging with the inner needle storage body 30 is provided.

The outer needle 11 has a fixed portion 11a fixed to the inner wall of the main passage 13 and an intermediate portion 1 protruding from the tip of the main passage 13.
1b and a tip portion 11c whose outer diameter is reduced from the middle portion 11b toward the tip. Conventionally, a soft material (for example, urethane or Teflon) has been molded into an ultrafine tube shape, but it is desirable to use a material having optical transparency so that it can be seen that blood is captured. An optimal material is, for example, amorphous PET. This is because it is easy to increase the light transmittance, and it is easy to ensure the dimensional accuracy of the outer and inner diameters and the ease of obtaining the finished product.

The inner wall of the outer needle 11 is preferably coated with a blood coagulant. This is because, if blood retention occurs for some reason, it may induce blood coagulation or bacterial growth, and suppress it. Furthermore,
The outer needle 11 may be subjected to a wettability improving process. This is because it is necessary to capture blood as quickly as possible in order to prevent inconveniences such as coagulation, and the “wetting property improving treatment” that enhances the capillary force is effective. The wettability improving process will be described later.

Since the wing member 12 has a purpose of contacting the human body for a long time and fixing the indwelling needle main body 10, it is generally a material having elasticity such as rubber or elastomer and having a good feel to the skin. Target.

(Inner needle body 20) The inner needle body 20 is the outer needle 1
An inner needle 21 made of a metallic ultrafine pipe located inside 1
A slider 2 for supporting and fixing the root portion of the inner needle 21.
2 and a filler 23 packed in the gap between the slider 22 and the root of the inner needle 21. The filling material 23 is
A material that does not allow liquid to pass through is adopted, and blood leakage from the root of the inner needle 21 can be prevented. The outer diameter of the slider 22 coincides with the inner diameter of the main passage 13 of the indwelling needle body 10 and can be moved back and forth in the main passage 13.

The inner needle 21 has a sharp end 21a formed by cutting it obliquely and a lateral hole 21 communicating with the pipe in the longitudinal direction at an intermediate portion in the longitudinal direction.
and b. The position of the lateral hole 21b is the inner needle 21.
Is provided so as to be located in the vicinity of the branch passage 14 in the indwelling needle main body 10 when attached to the outer needle 11.

The main passage 13 in the indwelling needle main body 10 supports the inner needle body 20 by the following structure until the infusion line is secured. First, the outer needle 1 in the main road 13
A funnel-shaped inner needle support member 15 that supports the vicinity of the center of the inner needle 11 is provided inside the first side. On the side opposite to the outer needle 11 of the inner needle support member 15, a cylindrical seal member 1 for closing the main passage 13 while ensuring communication with the branch passage 14.
6 is fixed. Further, a seal material 17 for fixing the seal member 16 to the indwelling needle body 10 is provided on the side of the seal member 16 opposite to the outer needle 11. In addition, a through hole serving as a guide for guiding the inner needle 11 to the outer needle 11 is formed in the center of the sealing material 17 in advance.

(Seal Member 16) The seal member 16 is made of a material having a self-closing property. In particular,
The inner needle 21 is made of a soft material (such as silicone rubber, urethane, or butyl rubber) that is penetrated by the tip 21a of the inner needle 21 and can be closely attached to the penetrating inner needle 21. Further, it has a self-closing property of closing the through hole when the penetrated inner needle 21 is removed. Therefore, it is possible to prevent blood from leaking through the seal member 16. By adopting the seal member 16 made of such a material, the number of members for assembling the indwelling needle structure can be reduced and the structure can be simplified.

The inner needle 21 is guided by the through hole of the sealing material 17, and the pointed end 21a thereof pierces the center of the seal member 16 to penetrate the tip 11c of the outer needle 11. Then, the inner needle support member 15 supports the inner needle 11 in the vicinity of the center thereof, the sealing material 17 and the slider 22 contact each other, and the slider 22 is installed in the main path 13 of the indwelling needle body 10.

(Inner needle storage body 30) The inner needle storage body 30 includes a storage cylinder 31 for storing the inner needle body 20 from the side opposite to the outer needle (11) in the main path 13 of the indwelling needle body 10, and the indwelling needle body 10. The coil spring 32, which is a biasing means for moving the inner needle body 20 from the state in which the inner needle body 20 is moved to the inside of the housing barrel 31, and the inner needle body 20 resists the biasing force of the coil spring 32 and the indwelling needle main body 10 Stopper for maintaining the state of being installed in the interior, and trigger 34 for releasing the stopper
It has and.

The storage cylinder 31 has a tail plug 31c for sealing one end in the longitudinal direction and fixing the end of the coil spring 32, and a re-exposure prevention for preventing the inner needle body 20 from being exposed again after it is stored. And a mechanism. The re-exposure preventing mechanism is a cantilever-like closing piece 31 that draws a bridge from the vicinity of the center of the cylinder toward the side opposite to the tail plug 31c.
a and an insertion window 31b for inserting a part of the closing piece 31a into the cylinder of the storage cylinder 31. Blocking piece 31
The vicinity of the tip of a is V-shaped, and its end is dimensioned to come out of the insertion window 31b once pushed into the insertion window 31b. The insertion window 31b has a closing piece 31a.
When is operated to prevent re-exposure of the inner needle body 20, a part of the closing piece 31a enters the inside of the storage cylinder 31 and closes the side of the storage cylinder 31 opposite the tail plug 31c.

The trigger 34 is formed by a pair of linearly symmetric members such as scissors, and each member is engaged with the engaged portion 22 provided on the slider 22 of the inner needle body 20.
The engaging portion 34a that engages so as to sandwich a and the storage cylinder 3
A fulcrum 34b fixed near the end on the side opposite to the tail plug 31c of 1
A lever portion 34c extending to the side opposite to the engaging portion 34a with respect to the fulcrum 34b, and an indwelling needle engaging portion 34d for engaging the indwelling needle main body 10 at the end portion on the opposite side of the lever portion 34c. I have it. Lever part 3 around the fulcrum 34b
When the 4c is operated to approach the storage cylinder 31 (that is, the pair of levers 34c is gripped), the trigger releases the stopper, and the coil spring 32 biases the inner needle into the cylinder of the storage cylinder 31. The body 20 moves. The above operation does not require skill and can be performed with one hand.

(Protective Cap 40) As shown in FIGS. 2 and 4, the inner needle 21 and the outer needle 11 are protected when the indwelling needle body 10, the inner needle body 20 and the inner needle housing body 30 are assembled. A protective cap 40 is provided. The protective cap 40 has an engagement structure that is detachably engaged with the indwelling needle body 10 and the inner needle housing 30 that are engaged with each other. Specifically, the indwelling needle engaging portion 34d near the tip of the trigger 34 and the engaged portion 10a of the indwelling needle main body 10 are engaged with each other so that the indwelling needle main body 10 and the inner needle storage body 30 are engaged with each other. There is. Protective cap 40
Has an engaged portion 40a formed on the inner circumference of the tip thereof and engages with a cap engaging portion 34e formed on the outer side in the vicinity of the tip of the trigger 34.

With the protective cap 40 attached,
The trigger 34 cannot be moved unless it is moved with such a force as to damage the protective cap 40. Therefore, it is prevented that the trigger 34 is accidentally operated and the inner needle 21 does not project from the outer needle 11 during use. Further, by mounting the protective cap 40, the inner needle 21 and the outer needle 11 are protected in a state where the inner needle body 20 and the inner needle housing body 30 are assembled, so that the state before use can be kept clean and safe.

(Inner Needle Housing Operation) The manner in which the inner needle body 20 is housed will be described with reference to FIGS. 3 and 4.
The end of the closing piece 31a is located inside the lever portion 34c, that is, on the side of the storage cylinder 31. Therefore,
When the trigger releases the stopper, the fulcrum 3
The lever portion 34c is moved closer to the storage cylinder 31 around 4b, and the closing piece 31a is pushed into the storage cylinder 31 through the insertion window 31b. At this time, the inner needle body 20 has already moved into the cylinder of the storage cylinder 31.

When the vicinity of the V-shaped end of the closing piece 31a is pushed into the storage cylinder 31, the end of the stopper 31a is caught from the inside of the insertion window 31b and stays inside the storage cylinder 31 without returning to its original state. Therefore, even if the trigger 34 returns to the original position as shown in FIG. 4, the inner needle body 20 is pushed into the storage cylinder 31, and the tip 21a of the most dangerous inner needle 21 is stored in the storage cylinder 31. Wrapped in.

(Infusion of Infusion from Puncture) Next, FIG. 5 and the like will be referred to with reference to FIG. It will be explained with reference to FIG. Inner needle 2
0 and the outer needle 11 are fixed to each other at the tip portion 11c, but there is a slight gap in the other portion. That is, the inner diameter of the outer needle 11 is slightly larger than the outer diameter of the inner needle 20. When the tip 21a of the inner needle 20 is punctured by a patient to capture a blood vessel, blood flows into the inner needle 20. Outer needle 1
When a material such as PET having excellent translucency is used as the material of 1, the blood vessel can be confirmed to be captured at the moment when the blood passes through the inside of the outer needle 11. Further, if the wettability improving process is performed, the blood flow to the outer needle 11 is faster than that of the unprocessed one.

At the base of the inner needle 20, there is a filling material 23 that does not allow blood to pass therethrough, so that it does not flow out from there.
Therefore, blood overflows from the lateral hole 21b. Then, the overflowed blood flows out between the inner needle 20 and the outer needle 11. At this time, since the outer needle 11 has optical transparency, the operator can visually recognize that the blood has flowed out between the inner needle 20 and the outer needle 11. At that time, the stopper is released as described above.

When the stopper is released, the inner needle 21 comes out from the outer needle 11 from the rear side, and the blood blocked by the seal member 16 flows into the branch passage 14. The branch passage 14 is filled with an infusion solution, and the infusion solution is injected into the blood vessel of the patient through the inside of the outer needle 11. The patient's blood once leaves the body in a volume that mixes with the infusion. This amount is
The number is less than that of the indwelling needle disclosed in 0-217925. Since the amount of blood retention can be reduced, the cause of inducing blood coagulation and bacterial growth is reduced, and the medicinal effect of infusion is enhanced as much as possible. If the inner wall of the outer needle 11 is coated with a blood coagulation agent, blood coagulation and bacterial growth can be further suppressed.

(First variation) The embodiment in which the trigger 34 is formed by a set of two triggers has been introduced. However, as shown in FIG. 7, the lever portion 34 is made one, and the lever portion 34 and the storage cylinder are arranged. It is also possible to make it so as to activate the trigger function by the inner needle body engaging portion 34a and the re-exposure prevention function by inserting the closing piece 34a into the insertion window 34b when operated by grasping 31. is there.

(Second variation) Although illustration is omitted, as a re-exposure preventing function, for example, the operation of the trigger 34 damages the blocking piece 31a, which causes the inner needle 2 to move.
You may form so that the storage cylinder 31 in the state which accommodated 1 may be closed.

The above-mentioned "wettability improving treatment" is a treatment for increasing the speed of capillary action in order to quickly suck up blood, and is, for example, a low temperature plasma treatment. Improvement of wettability by low temperature plasma treatment will be proved in the following experiment.

[0053]

[Experimental Example] An experimental example relating to the effect of the low-temperature plasma treatment will be described by a capillary phenomenon by a capillary tube. In this low temperature plasma treatment, the PET capillaries according to the above-described embodiment are dried at 50 degrees Celsius for 8 hours, and then at room temperature for 30 seconds.
Plasma treatment was performed in a normal atmosphere. The test method of the capillary force is that when one end of the tube is touched with physiological saline for 10 seconds,
The method was to determine the height of the liquid surface from the pipe end.
The results obtained were as follows, with the tubes having the same inner diameter: Type of material Liquid level from the tube end Glass capillary (untreated) 10 mm PET capillary (before treatment) 3 mm PET capillary (after treatment) 10 mm The results are as shown above for the inner surface of the capillary. The wettability was improved and the capillary force equivalent to that of the existing glass product was obtained.

[0054]

According to the inventions of claims 1 to 7, in the indwelling needle having a branch and used for infusion or dialysis, the used inner needle can be safely treated without requiring skill. It was possible to provide an indwelling needle structure that can be used. According to the invention described in claims 8 to 10, it is possible to further provide an indwelling needle structure capable of confirming capture of a blood vessel as soon as possible.

[Brief description of drawings]

FIG. 1 is a front view and a cross-sectional side view of a half section for explaining a connection between an inner needle and a storage mechanism in an embodiment of the present invention.

FIG. 2 is a front view and a cross-sectional side view of a half section showing an entire embodiment of the present invention.

FIG. 3 is a front view and a cross-sectional side view of a half section showing a state in which an inner needle is safely stored.

FIG. 4 is a front view and a cross-sectional side view of a half section showing a state in which an inner needle is safely stored.

FIG. 5 is a front view and a side view showing the entire embodiment of the present invention and showing only a cap portion as a partial sectional view.

FIG. 6 is an assembled perspective view showing the entire embodiment of the present invention.

7A and 7B are a half sectional front view and a sectional side view showing a variation for realizing the re-exposure prevention function adopted in the embodiment of the present invention.

FIG. 8 is a partial cross-sectional view showing the main part of the invention disclosed in JP-A-10-179734.

FIG. 9 is a partial cross-sectional view showing a main part of the invention disclosed in Japanese Patent Laid-Open No. 2000-217925.

[Explanation of symbols]

10 Indwelling needle body 10a Engaged part 11 Outer needle 11a Fixed part 11b Intermediate part 11c Tip part 12 wings 13 main roads 14 Branch path 15 Inner needle support member 16 Seal member 17 Seal fixing material 20 inner needle 21 inner needle 21a pointed portion 21b Horizontal hole 22 slider 22a engaged portion 23 Filling material 30 Inner needle storage 31 Storage Tube 31a Closure Piece 31b insertion window 31c tail plug 32 coil spring 34 Trigger 34a Inner needle body engaging part 34b fulcrum 34c lever part 34d Indwelling needle engaging part 34e Cap engaging part 40 Protective cap 40a Main body engaged part

Claims (10)

[Claims] 1. An indwelling needle main body for communicating a blood vessel of a patient with an infusion solution, an inner needle body for capturing a blood vessel of the patient to ensure a communication state with the indwelling needle main body, and an inner needle body after capturing the blood vessel. A structure of an indwelling needle having an inner needle housing for housing a needle body, wherein the indwelling needle main body communicates with a tubular main passage and an internal space of the main passage and protrudes from a tip thereof. A pipe-shaped outer needle and a branch passage connected and branched so as to communicate with the main passage for sending an infusion solution into the outer needle are provided. The inner needle body is a metal ultrafine pipe located inside the outer needle. An inner needle, and a slider that supports and fixes the root portion of the inner needle and that can advance and retreat in the main passage, and the inner needle container is an inner needle body from the side opposite to the outer needle in the main passage of the indwelling needle body. Move the inner needle body from the state where it is stored in the storage cylinder and the indwelling needle body into the storage cylinder. In order to maintain the state in which the inner needle body is housed in the indwelling needle body against the urging force of the urging means, and the urging means fixed to the slider for releasing the stopper. Indwelling needle structure with a trigger. 2. The indwelling needle structure according to claim 1, wherein the inner needle container includes a re-exposure preventing mechanism for preventing the tip of the inner needle once housed from being exposed. 3. The re-exposure preventive mechanism is provided with a re-exposure preventing mechanism, wherein the trigger has an engaging portion for engaging with the slider of the inner needle body, and a lever portion for releasing the engagement by the engaging portion by a gripping operation. The indwelling needle structure according to claim 2, further comprising a closing piece that operates in conjunction with the operation of releasing the engagement by the engaging portion and closes the storage cylinder. 4. The outer needle is provided with a tip portion whose outer diameter is narrowed toward the tip, and is made of a light-transmissive material capable of visually confirming that blood has been captured. The indwelling needle structure according to any one of 3 above. 5. A cylindrical seal member for closing the main passage while ensuring communication with the branch passage, and the seal member is made of a material having a self-closing property. The indwelling needle structure described in any of the above. 6. The indwelling needle structure according to any one of claims 1 to 5, further comprising a lateral hole communicating with a longitudinal pipe in an intermediate portion of the inner needle in the longitudinal direction. 7. An indwelling needle having a protective cap for protecting the inner needle and the outer needle when the indwelling needle main body, the inner needle body and the inner needle container are assembled, the protective cap engaging with each other. The indwelling needle structure according to any one of claims 1 to 6, comprising an engagement structure that is detachably engaged with the main body and the inner needle storage body. 8. The indwelling needle structure according to claim 1, wherein the outer needle is manufactured by extrusion-molding a translucent thermoplastic resin. 9. The indwelling needle structure according to claim 8, wherein the inner wall of the outer needle is coated with a blood coagulant. 10. The indwelling needle structure according to claim 7, wherein the outer needle is subjected to a wettability improving treatment.