JP4802914B2 - Medical pipe joint and line used for transporting infusion or blood using the same - Google Patents

Description

  The present invention relates to a medical pipe joint, and more particularly to a technique for reliably performing a liquid-tight seal and engaging and fixing when connecting to a medical device having a different standard having an infusion or blood conveyance path.

In the infusion or blood line, in order to mix the drug solution into the main liquid supply path for infusion or blood transfusion to the patient or to collect the sample of the liquid flowing in the main liquid supply path, a side injection path is provided in the main liquid supply path. As a device for forming such a side injection path, there are a mixed injection port 1000 and a three-way stopcock 3000 as shown in FIG.
The mixed injection port 1000 includes a tubular port body 1010 in which a through-hole (not shown) is formed in a flat valve seat 1102 provided on a central tube wall, and the through-hole (not shown) made of an elastic material. A disc-like valve body 1011 disposed on the valve seat portion 102 so as to shield the valve body, and a cover body 1120 having a cylindrical shape in which the valve body 1011 is mounted and fixed to the port main body 1010 and having a through hole 1012 in the center. And a U-shaped cover holder 1013 for fixing the cover body 1120.

A slit portion 1111 is formed in the center of the valve body 1011 so that a thin tube such as a luer portion can be inserted from the outside.
In addition, the cover body 1120 is provided with a pair of protrusions 1126 that protrude radially outward from the side wall of the cylindrical housing in order to fix the connection state of the thin tubes inserted into the valve body 1011. Yes.

  Further, the three-way stopcock 3000 is provided with a cylindrical main body 3001, a first branch pipe 3011, a second branch pipe 3012, and a lock nut that extend radially from the peripheral surface of the main body 3001 in three directions. The third branch pipe 3013 and a column switching portion 3002 that is rotatably inserted in the main body portion 3001 and has a through hole that branches in three directions inside thereof.

The first branch pipe 3011 and the second branch pipe 3012 are designed according to the ISO standard (ISO-594), and have a so-called female luer portion whose inner diameter gradually decreases as the distance from the end portion increases. A male screw portion 3011a and a male screw portion 3012a are engraved on the outer periphery of the end portion.
The taper shape of the female luer portion and the positional relationship between the male screw portion 3011a and the male screw portion 3012a are strictly determined in the ISO standard.

The mixed injection port 1000 and the three-way stopcock 3000 described above are used for branching the liquid feeding path, but the first branch pipe is provided at the end of a simple pipe having only one transport path for transporting infusion or blood. Some have the same structure as 3011.
Such a pipe is referred to as a female luer-attached pipe for convenience.
In the mixed injection port 1000, and the three-way stopcock 3000 and the pipe with the male luer part, the connection mechanisms for connecting the pipes are individually designed, that is, because the standards are different, so the mixed injection port is one kind of pipe joint. When trying to connect to both 1000 and the three-way stopcock 3000 or a tube with a female luer part, even if a so-called luer slip connection can be made to connect only the luer part of this pipe joint, an engagement mechanism is used so as not to release this connection. It is generally difficult to make a so-called luer lock connection that engages and fixes each other (hereinafter referred to as “lock”).

A pipe joint 2000 as shown in FIG. 4 is provided as a pipe joint capable of realizing a luer slip connection and a luer lock connection in any of such differently designed medical devices. (For example, Non-Patent Document 1)
This pipe joint 2000 is a highly versatile pipe joint that can be connected to differently designed different types of medical instruments in three ways, and the pipe body 2220 is inserted into the connection auxiliary body 2230. Become.

The tubular body 2220 is provided with a luer portion 2224 at a first end portion of a rigid and cylindrical main pipe portion 2221, an annular rib 2223 is disposed on a peripheral surface of the first end portion, and on the outer surface of the main pipe portion 2221. A pair of stripe ribs 2225 extending along the tube axis is disposed, and a soft connecting tube 2226 is connected to the other second end of the main tube portion 2221.
The connection auxiliary body 2230 includes a cap cover portion 2230 that covers the cover body 1120 and engages with the end portion on one side of the cylindrical main body portion 2223.

A small diameter portion 2236 having an inner diameter slightly larger than the outer diameter of the main pipe portion 2221 and a female screw portion 2238 having a minimum inner diameter larger than the inner diameter of the small diameter portion 2236 are disposed inside the main body portion 2223. ing.
The cap cover portion 2230 is provided with a pair of grooves 2239 that engage with the pair of protrusions 1126 of the cover body 1120 on the inner periphery thereof.

  As shown in connection method (I), when connecting the pipe joint 2000 to the mixed injection port 1000, the luer part 2224 of the pipe joint 2000 is inserted into the slit part 1111 of the valve body 1011 and the connection auxiliary body 2230 is covered. By closely contacting the body 1120 and twisting in the A1 direction, the protrusion 1126 of the mixed injection port 1000 enters the groove 2239 of the pipe joint 2000, and the positions of the mixed injection port 1000 and the pipe joint 2000 are fixed and connected.

Conversely, the connection is released by twisting the connection auxiliary body 2230 in the A2 direction.
Similarly, as shown in the connection method (II), when connecting the pipe joint 2000 to the three-way stopcock 3000, the luer part 2224 of the pipe joint 2000 is inserted into, for example, the opening 3011b of the first branch pipe 3011. At the same time, the connection auxiliary body 2230 is brought into close contact with the cover body 1120 and twisted in the A1 direction, whereby the male thread portion 3011a of the three-way cock 3000 is screwed into the female thread portion 2238 of the pipe joint 2000, and the three-way cock 3000 and the pipe joint 2000 Is locked, and so-called luer lock connection is established.

Further, the luer lock connection is released by twisting the connection auxiliary body 2230 in the A2 direction.
In this way, even a mixed injection port and a three-way stopcock designed individually can be connected to both of them and locked with one kind of pipe joint.
Further, as shown in the connection method (III), the connection auxiliary body 2230 of the pipe joint 2000 is moved from the main pipe portion 2221 onto the communication pipe 2226, and the pipe body 2220 is not connected to the three-way cock 3000 without using the connection auxiliary body 2230. A so-called luer slip connection can also be made.
Catalog 2002.07.20XA083 (JMS Corporation)

However, as shown in FIG. 4, when the pipe joint 2000 is connected to the mixed injection port 1000 and the connection auxiliary body 2230 is locked by being twisted in the A1 direction, the liquid from the contact portion between the luer portion 2224 and the slit portion 1111 is extremely rare. It was found that there was a case where leakage occurred (hereinafter referred to as “seal failure”).
As shown in FIG. 5, when the luer part 2224 is inserted into the slit part 1111 of the valve body 1011, this sealing failure is caused by the insertion amount being shallow. Since it is spread out, the amount of evacuation of the slit portion 1111 is reduced, and this occurs when the pressing force at the contact portion is insufficient.

On the other hand, as shown in FIG. 4, when the pipe joint 2000 is connected to the three-way stopcock 3000 and the connection auxiliary body 2230 is twisted and locked in the A1 direction, the lock is released because this engagement is not complete. (Hereinafter referred to as “lock failure”).
This lock failure occurs because the threaded portion 3011a of the three-way cock 3000 is shallowly applied to the female threaded portion 2238 of the pipe joint 2000, as shown in part B of FIG.

  Regarding the above-mentioned lock failure, since the outer diameter of the luer portion 2224 of the pipe joint 2000 is reduced as a whole, deeper insertion into the opening 3011b of the first branch pipe 3011 becomes possible. Although it is possible to deepen the engagement of the male thread portion 3011a, it is possible to improve the locking failure, but for the sealing failure, the above-described evacuation amount is reduced, and the sealing failure is further deteriorated. It is impossible to carry out both improvement of locking failure and improvement of sealing failure.

  The present invention has been made to solve such problems, and uses a medical pipe joint capable of making a luer lock connection to different types of individually designed medical devices without problems. An object is to provide a line used for transporting infusions or blood.

  In order to achieve the above object, a medical pipe joint according to the present invention includes a first pipe structure and a second pipe structure which are provided with a liquid feed path and are formed according to different standards. A valve body as a pipe connection mechanism is provided in the liquid feed path of the first pipe structure, and a connection hole is provided in the liquid feed path of the second pipe structure. A medical pipe joint that can be connected, a tubular body having a luer portion fitted at either of the valve body and the coupling hole at the tip, the tubular body at the first tubular structure, and the A first locking portion for engaging with a first locked portion formed in the first tube structure; and a second locking portion for use in connecting and fixing to the second tube structure. A connection aid having a second locking portion that engages with a second locked portion formed in the tube structure, and the tube cylinder is loosely inserted into the connection aid. A state in which the luer part of the tubular body is fitted into the valve body, and the first locking part is engaged with the first locked part, and the lure part. The relative position between the tubular body and the connection aid that occurs between the two states of inserting the second engagement portion into the connection hole and engaging the second engagement portion with the second engagement portion. The difference is absorbed by the tubular body moving in the axial direction of the tubular body with respect to the connection aid, and in the two states, the tubular body is separated from the elastic member by the elastic member. It is characterized by receiving a reaction force toward the fitting direction of the lure part.

  In order to achieve the above object, the medical pipe joint is connected to a line provided for infusion or blood conveyance according to the present invention.

  Thereby, when the elastic member engages the first locking portion with the first locked portion in a state where the luer portion of the tubular body is fitted into the valve body, the luer portion is fitted into the connecting hole. In the state, when the second locking portion is engaged with the second locked portion, the tube is deformed by an urging force received according to the engagement, and the tube body and the connecting auxiliary tool in the tube body axis direction In order to absorb the displacement of the engaging position, even if there is a large difference between the distance to the first locking part and the distance to the second locking part with reference to the position of the tip of the luer part, it is securely engaged. Can be implemented.

Furthermore, when the luer part of the tubular body is fitted in the valve body, the second locking part is engaged with the first locked part, and the second lure part is fitted in the connecting hole. When engaging the locking portion with the second locked portion, the elastic member urges the tubular body in the direction in which the luer portion is inserted, so that the luer portion and the valve body or the connection hole are securely connected. Adherent to the liquid and hermetically sealed
By these, the luer lock connection to a medical device with a different standard having an infusion or blood transport path can be implemented without any problem.

The elastic member is a spring and is preferably disposed on the tubular body.
As a result, it is possible to obtain an urging force having a magnitude corresponding to the amount of deflection.
The spring constant of the spring is preferably 5 N / mm or more and 20 N / mm or less.
This avoids an unreasonable increase in the amount of protrusion of the luer part from the coupling aid, and also increases the pressing force between the luer part and the receiving part, thereby improving the liquid-tight sealing performance. Furthermore, the insertion pressure of the luer part does not become unreasonably large, the occurrence of inconvenience such as the occurrence of biting when the connection is released and the disengagement can be avoided, and the operating force does not unreasonably increase.

Moreover, it is desirable that the connection aid is detachable from the tubular body.
As a result, it can be used as a medical pipe joint without a connection auxiliary tool, that is, a luer slip connection is possible, so that versatility is improved and usability is improved.
For example, as a connection partner of a medical pipe joint, there is a female luer part that does not engage with either the first locking part or the second locking part (the luer part of which the inner diameter gradually decreases as the distance from the opening part increases). In such a case, the connection aid does not make any sense at all, and in the female luer part having a larger inner diameter of the opening part of the female luer part, the luer part relative to the female luer part Since the insertion depth becomes deeper than usual, the female luer part and the connection aid may interfere with each other and may not be connected.

In such a case, it is possible to avoid interference between the female luer part and the coupling auxiliary tool by allowing the female screw to be detached from the male screw and moving the coupling auxiliary tool away from the luer part. The range can be expanded.
In addition, the connection aid is cylindrical and is provided around the tubular body. When the direction in which the outer diameter of the luer portion gradually increases is defined as a gradually increasing direction, the connection aid is formed on the outer peripheral surface of the tubular body. The first protrusion and the second protrusion are disposed at a distance from each other in this order in the gradually increasing direction, and the elastic member is a winding spring, and the first protrusion and the first protrusion in the tubular body It is desirable to be provided between two protrusions.

As a result, the spring can be locked to the tubular body with a simple configuration.
Further, the inner wall of the connection aid is provided with a groove along the tube body axis, and the outer periphery of the tube body is further on the gradually increasing direction side than the second protrusion, It is desirable to have a third protrusion that can pass through the groove.
Thereby, the movement range in the tubular body of the connection assisting tool is restricted, the operator can hold the connection assisting tool around the lure part that is easy for the operator to reach, and when the connection assisting tool is not necessary, After adjusting the angle of the connection assisting tool and the tube so that the position of the groove and the position of the third protrusion are aligned, the third protrusion is passed through the groove so that the connection assisting tool is gradually increased. By moving, the connection assisting tool can be retracted to a position that does not interfere with the operator.

Embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic diagram illustrating the configuration of a medical pipe joint 20 according to an embodiment of the present invention.
The medical pipe joint 20 is a joint of a pipe constituting a transport path for transporting infusions and blood transfusions, such as a mixed injection port 1000 providing a side injection path in the main liquid supply path, a three-way stopcock 3000, and a tube with a female luer part. It is a pipe joint 20 that can be connected to either of them and can lock the engagement with each other, that is, lockable.

Here, the configuration of the mixed injection port 1000, the three-way stopcock 3000, and the female luer-attached pipe will be described.
As described above, the mixed injection port 1000 includes a tubular port body 1010 in which a through-hole (not shown) is formed in a flat valve seat 1102 provided on a central tube wall thereof, and an elastic material. And a disc-like valve body 1011 disposed on the valve seat portion 102 so as to shield the through hole (not shown), and a cylindrical shape that attaches and fixes the valve body 1011 to the port body 1010 and has a through-hole in the center. The cover body 1120 is provided with 1012, and the U-shaped cover holder 1013 is provided with claws at both ends for fixing the cover body 1120.

In the center of the valve body 1011, a slit portion 1111 is formed so that a thin tube can be inserted from the outside, and the cover body 1120 is provided to fix the connection state of the thin tube inserted into the valve body 1011. A pair of protrusions 1126 projecting radially outward from the side wall of the cylindrical casing are provided.
Further, as described above, the three-way stopcock 3000 includes a cylindrical main body part 3001, and a first branch pipe 3011, a second branch pipe 3012, and a third branch pipe 3012 extending from the peripheral surface of the main body part 3001 in three directions. It comprises a third branch pipe 3013 provided with a lock nut, and a passage switching part 3002 having a cylindrical shape inserted into the main body part 3001 so as to be freely rotatable and through-holes arranged in three directions.

The first branch pipe 3011 and the second branch pipe 3012 are designed according to ISO-594 (standard), and are so-called female luer portions whose inner diameters gradually decrease as they move away from the end portions. A male screw portion 3011a and a male screw portion 3012a are engraved on the outer periphery.
In addition, as described above, the female luer-attached pipe is a single pipe adopting the same structure as that of the first branch pipe 3011 at the end.
(Configuration of medical pipe joint 20)
As shown in FIG. 1, the medical pipe joint 20 is a highly versatile pipe joint that can be connected to a medical device having different infusion standards or blood transport paths by three methods, and has a cylindrical shape. The tube body 220 is inserted into the connection auxiliary body 23.

  The tubular body 220 has a luer portion 224 disposed at a first end portion of a rigid and cylindrical main pipe portion 221, an annular rib 223 is disposed on a peripheral surface of the first end portion, and an outer surface of the main pipe portion 221. A pair of first stripe ribs 222 extending along the tube axis is disposed, and is further inclined by 90 degrees in the circumferential direction with respect to the first stripe rib 222 in the vicinity of the other second end of the main tube portion 221. A pair of second stripe ribs 225 extending along the tube axis is disposed there, a winding spring 211 is provided between the annular rib 223 and the first stripe rib 222, and the second end of the main pipe portion 221 is further provided. A soft connecting tube 226 is connected to the section.

The first stripe rib 222 and the second stripe rib 225 have the same width in the direction perpendicular to the tube axis and the height from the outer surface of the main tube portion 221.
The spring constant of the winding spring 211 is set to 10 N / mm.
The connection auxiliary body 23 is formed by arranging a cap cover portion 230 that covers and engages the cover body 1120 at the first end portion of the cylindrical main body portion 235.

The cap cover portion 230 is provided with a pair of groove portions 239 that engage with the pair of protrusions 1126 of the cover body 1120 on the inner periphery thereof.
The main body 235 has a small-diameter portion 236 whose inner diameter is slightly larger than the outer diameter of the main pipe portion 221, and a large-diameter portion 236 a whose inner diameter is larger than the small-diameter portion 236 and smaller than the maximum diameter of the winding spring 211. And a female screw portion 238 having a minimum inner diameter larger than the inner diameter of the small-diameter portion 236 is arranged in this order from the second end portion to the first end portion. Further, a pair of groove portions 237 through which the first stripe rib 222 and the second stripe rib 225 can pass are formed along the tube axis.

  As shown in the connection method (I) of FIG. 1, when the pipe joint 20 is connected to the mixed injection port 1000, the luer while urging the connection auxiliary body 23 of the pipe joint 20 in the direction in which the luer portion 224 is located. By inserting the portion 224 into the slit portion 1111 of the valve body 1011, the luer portion 224 comes into contact with the edge of the through hole 1012 of the cover body 1120, and the connection auxiliary body 23 is closely attached to the cover body 1120 and twisted in the C1 direction. The projection 1126 of the mixed injection port 1000 enters the groove 239 of the pipe joint 20, and the positions of the mixed injection port 1000 and the pipe joint 20 are fixed and securely connected.

At this time, the first stripe rib 222 is in the groove portion 237, and a relative change between the connection auxiliary body 23 and the tube body 220 with the tube axis of the main tube portion 221 as the rotation axis is prevented. That is, when the connection auxiliary body 23 is twisted, the tube body 220 is also twisted.
When the luer part 224 is inserted into the slit part 1111, a maximum puncture resistance of 30 N is generated. Therefore, the winding spring 211 is contracted by this reaction force, and the tube body 220 is retracted relative to the connection auxiliary body 23. However, in consideration of the retraction amount, the allowance (L shown in FIG. 2) of the luer portion 224 from the connection assisting body 23 when no load is applied to the winding spring 211 is set to 8 mm.

For this reason, when the connection is completed, as shown in FIG. 2, the luer part 224 can be inserted into the slit part 1111 of the valve body 1011 to a depth sufficient to ensure the liquid-tight sealing performance.
Similarly, as shown in the connection method (II), when connecting the pipe joint 20 to, for example, the three-way cock 3000, the luer part 224 of the pipe joint 20 is connected to, for example, the opening 3011b of the first branch pipe 3011. In addition, the connection auxiliary body 23 is brought into close contact with the first branch pipe 3011 and twisted in the C1 direction, whereby the male thread part 3011a of the three-way cock 3000 is screwed into the female thread part 238 of the pipe joint 20, and the three-way cock 3000 And the position of the pipe joint 20 are locked.

At this time, similarly to the connection method (I), the connection auxiliary body 23 is urged toward the luer part 224 and the luer part 224 is inserted into the opening 3011b of the first branch pipe 3011 during the connection. When the luer part 224 completely enters the opening 3011 b, no further insertion is possible, the winding spring 211 contracts, and the tube body 220 retracts relative to the connection auxiliary body 23.
At this time, the male threaded portion 3011a of the first branch pipe 3011 approaches the female threaded portion 238 of the pipe joint 20, and the connection auxiliary body 23 is twisted along with the biasing, whereby the female threaded portion 238 and the female threaded portion 238 are threaded. The part 3011a is screwed, and the degree of engagement is deepened. Finally, as shown in part D of FIG. 3, the part 3011a is deeply screwed to the extent that the engagement is not released.

When this screwing is completed, the retraction amount of the tube body 220 with respect to the connection auxiliary body 23 is larger than that of the connection method (I).
Further, as shown in connection method (III), the connection auxiliary body 23 of the pipe joint 20 is moved from the main pipe portion 221 onto the connecting pipe 226, and the pipe body 220 is connected to the three-way stopcock 3000 without using the connection auxiliary body 23. In other words, a slip connection can be made.
(About spring setting)
In the present embodiment, the spring constant of the winding spring 211 is set to 10 N / mm.

  When the set value of the spring constant is changed to 5 N / mm, 10 N / mm and 20 N / mm, the set value of the spring allowance L in FIGS. 2 and 3, no load, when the mixed injection port is mounted, and the three-way stopcock Table 1 shows the force acting on the spring when 3000 is attached (when the female luer part is attached).

巻きバネ２１１のバネ定数を５Ｎ／ｍｍ未満に設定すると、無負荷時の出代Ｌが１１ｍｍを超えてしまい、ルアー部２２４が大きく露出するために、他のものと接触しやすくなり、取り扱いがし難くなる。

If the spring constant of the winding spring 211 is set to less than 5 N / mm, the allowance L at no load exceeds 11 mm, and the luer part 224 is exposed greatly, so that it is easy to come into contact with other things. It becomes difficult to do.

On the other hand, if the spring constant of the winding spring 211 is set to exceed 20 N / mm, the reaction force of the spring exceeds 90 N, and the operating force at the time of engagement becomes difficult to handle, causing a problem in practical use.
Furthermore, the engagement at the luer part 224 is an engagement between the tapers, and if the reaction force of the spring is increased too much, so-called biting that cannot be released when the engagement is released may occur. By setting it to 20 N / mm or less, it is possible to prevent such inconvenience from occurring.

From the above, the spring constant of the winding spring 211 is preferably 5 N / mm or more and 20 N / mm or less.
(Summary)
When the pipe joint 20 is connected to a connection object such as the mixed injection port 1000 or the three-way stopcock 3000 by the luer lock connection, the medical pipe joint 20 of the present embodiment urges the connection auxiliary body 23 to slit the luer portion 224. When the tube body 220 is inserted into the portion 1111 and the opening 3011b, the position of the tube body 220 with respect to the connection auxiliary body 23 is retracted along with the insertion, and this retraction is performed to a position suitable for engagement for each connection target device. Even if it is a connection object instrument of this, engagement is made reliably.

  In the medical pipe joint 20 of the present embodiment, the winding spring 211 is interposed in the engagement between the connection auxiliary body 23 and the pipe body 220, but the pipe body 220 moves backward with respect to the connection auxiliary body 23. Any elastic body may be used as long as it is configured to give a reaction force to each other. For example, a cylindrical rubber may be used. Moreover, even if it is a spring, the shape is not limited to a wound spring, and may be, for example, a bellows shape or a leaf spring.

  Moreover, in the medical pipe joint 20 of this Embodiment, although the winding spring 211 is latched by pinching the winding spring 211 with the annular rib 223 and the 1st stripe rib 222, it is limited to such a structure. For example, the length of the annular rib 223 in the tube axis direction is longer than that of the present embodiment, and a groove in which the winding of the winding spring 211 is just fitted is engraved in this portion. Alternatively, only one end of the winding spring 211 may be fitted to the other, and the other end of the winding spring 211 may be left free.

  When such a configuration is employed, the first stripe rib 222 is not necessary for the purpose of locking the winding spring 211.

  The present invention can be applied to a medical instrument that constitutes a main liquid supply path for performing infusion or blood transfusion to a patient.

It is a figure explaining the structure and usage example of the pipe joint in embodiment of this invention. It is sectional drawing which shows the internal condition in the case of connecting the pipe joint of embodiment of this invention to a mixed injection port. It is sectional drawing which shows the internal condition in the case of connecting the pipe joint of embodiment of this invention to a three-way cock. It is a figure explaining the structure and usage example of the conventional pipe joint. It is sectional drawing which shows the internal condition in the case of connecting the conventional pipe joint to a mixed injection port. It is sectional drawing which shows the internal condition in the case of connecting the conventional pipe joint to a three-way cock.

Explanation of symbols

20 pipe joint 23 connection auxiliary body 102 valve seat part 211 spring 220 pipe body 221 main pipe part 222 stripe rib 223 annular rib 224 luer part 225 stripe rib 226 connecting pipe 230 cap cover part 235 main body part 236 small diameter part 236a large diameter part 237 Groove part 238 Female thread part 239 Groove part 1000 Mixed injection port 1010 Port body 1011 Valve body 1013 Cover holder 1102 Valve seat part 1111 Slit part 1120 Cover body 1126 Protrusion 3000 Three-way stopcock 3001 Main body part 3002 Channel switching part 3011a Male thread part 3011b Opening part 3011b Threaded portion 3011 First branch pipe 3012 Second branch pipe 3013 Third branch pipe

Claims (7)

In the first pipe structure and the second pipe structure that are provided with a liquid feed path and are formed according to different standards, the liquid feed path of the first pipe structure serves as a pipe connection mechanism. A medical pipe joint that can be connected to any of two types in which a valve body is disposed and a connection hole is arranged in the liquid feeding path of the second pipe structure,
A tubular body having a luer part fitted at either end of the valve body and the connection hole;
A first locking portion formed on the first tube structure, wherein the tube tube body is used for connecting and fixing the tube structure to the first tube structure and the second tube structure; A connection aid having a first locking portion to be engaged and a second locking portion to be engaged with a second locked portion formed in the second tube structure;
An elastic member that holds the tubular body in a loosely inserted state with respect to the connection aid,
Inserting the luer part of the tubular body into the valve body, engaging the first locking part with the first locked part, and inserting the luer part into the connecting hole; A difference in the relative position between the tubular body and the connection aid that occurs between the two states of engaging the second engagement portion with the second engagement portion is described as follows. In contrast, the tubular body is absorbed by moving in the axial direction of the tubular body, and in the two states, the tubular body is moved from the elastic member toward the fitting direction of the luer portion. Medical pipe joint characterized by receiving force.   The medical pipe joint according to claim 1, wherein the elastic member is a spring and is disposed in the tubular body.   The medical pipe joint according to claim 1, wherein the spring constant of the spring is 5 N / mm or more and 20 N / mm or less.   The medical coupling according to claim 1, wherein the connection aid is detachable from the tubular body. The connection aid is cylindrical and is provided around the tubular body,
When the direction in which the outer diameter of the luer portion gradually increases is the gradually increasing direction,
On the outer peripheral surface of the tubular body, a first protrusion and a second protrusion are disposed at a distance from each other in this order in the gradually increasing direction,
2. The medical pipe joint according to claim 1, wherein the elastic member is a wound spring and is provided between the first protrusion and the second protrusion in the tubular body. Furthermore, a groove is disposed along the tube axis on the inner wall of the connection aid,
6. The medical pipe joint according to claim 5, wherein a third protrusion that can pass through the groove is further provided on the outer periphery of the tubular body on the further increasing direction side than the second protrusion. A line used for transporting infusion or blood to which the medical pipe joint according to claim 1 is connected.

Images