JPS6150459B2 - - Google Patents

Description

[Detailed Description of the Invention] () Background of the Invention (I-1) Technical Field The present invention is applicable to treatments in which liquids such as medicine and blood are injected into the body through tubes and catheters, such as infusion treatment, blood transfusion treatment, and dialysis. The present invention relates to a connecting device for medical tubes for transporting liquid, which eliminates the risk of microorganisms such as bacteria and viruses entering the connecting portion when used when connecting tubes to each other or a tube to a catheter in treatment.

(-2) Prior art and its problems In continuous treatments such as peritoneal dialysis, infusions, and blood transfusions, it is technically necessary to completely prevent microorganisms from entering the tubes when connecting tubes to each other or connecting tubes to containers or catheters. This is considered an issue. Particularly in treatments such as peritoneal dialysis, which involves treatment at sites such as the intraperitoneal cavity, which has no ability to protect against bacteria, it is an absolute technical challenge to reliably prevent microorganisms from entering the peritoneal cavity from within the tube.
Compared to dialysis using an artificial kidney, recent peritoneal dialysis treatments do not require large-scale equipment or equipment, making treatment costs significantly lower, and the causes of peritoneal adhesions have been largely elucidated, so peritoneal adhesions can also occur. The continuous mobile peritoneal dialysis method (CAPD method) has been developed to the point where it can significantly reduce the burden placed on the patient without the need for physical therapy, and it also allows the patient to work while continuing treatment.
Since it was invented and put into practical use, it has received much attention and has been reviewed extensively. The reliability of this dialysis method in terms of life safety is determined by whether it can reliably prevent microorganisms such as bacteria and viruses from entering the tube, and whether it can avoid the occurrence of peritonitis due to the proliferation of microorganisms within the peritoneal cavity. Although it depends on
Currently, it is considered difficult to carry out long-term implementation.

As a specific example, a conventional continuous mobile peritoneal dialysis method will be described with reference to FIG. An indwelling type catheter 2 is surgically implanted into the abdominal cavity 1 of a patient M, a connector 3 is attached to the external end of the indwelling type catheter 2, and a connector 5 attached to one end of a transport tube 7 is connected to this connector 3. To inject the dialysate into the abdominal cavity 1, a container 6 containing the dialysate is suspended at a predetermined height higher than the abdominal cavity 1, and a piercing needle 11 is attached to the tip of the transport tube 7 at the outlet of the container 6. This is done by piercing the hole and loosening the clamp 10 attached halfway. After injecting the dialysate into the abdominal cavity 1, the patient can walk or work by closing the clamp 10, appropriately rolling the transport tube 7, and attaching the container 6 to the waist. To withdraw the dialysate from the peritoneal cavity 1 after a predetermined period of time has elapsed, the transport tube 7 may be extended, the container 6 placed on the floor or the like, and the clamp 10 loosened. Then, by pulling out the piercing needle 11 from the container 6, making the container 6 disposable, setting the next new container 6 at a high place, and piercing the new container 6 with the piercing needle 11, the second and subsequent dialysis can be performed. .

However, in order to prevent microorganisms from entering the tube when connecting the connector 3 to the outlet of the container 6 and the puncture needle 11 during the first and second dialysis, currently the connectors 3 and 5 are iodine-coated. Sterilization operations are performed, such as instantaneous immersion in a disinfectant solution or thoroughly wiping the tip of the puncture needle 11 with a disinfectant. However, a very small amount of the disinfectant used enters the body during intraperitoneal injection of dialysate and acts as a harmful substance, so it is not possible to use a disinfectant with high concentration or complete sterilization; A liquid with weak sterilizing power is used.

Therefore, conventional sterilization procedures cannot be said to be sterile from a microbiological point of view, and in fact, infections from the connectors and puncture needles occur about two months after dialysis begins, resulting in peritonitis. It has been reported that there are many cases in which this occurs, and it is currently impossible to prevent this, and although continuous mobile peritoneal dialysis is an effective treatment like the previous one, it is difficult to implement it continuously over a long period of time. It is said to be in a state of

() Purpose of the Invention The present invention was devised after intensive research in view of the above-mentioned points, and is used as a means for connecting tubes or tubes and catheters, and is a device that connects tubes by heating them with a flame such as an alcohol lamp. It is possible to dissociate, and chemical changes such as rust and surface changes due to heating do not occur.Therefore, even if connection and dissociation are repeated over a long period of time, there is no risk of bacteria or viruses entering. It is effective for peritoneal dialysis using the intraperitoneal cavity, which has no protective ability at all.
In particular, it is extremely effective for continuous mobile peritoneal dialysis, in which patients themselves update their dialysis treatment at home or at work without the help of a doctor, and it is extremely effective at the tube connection point in a wide range of other treatments, including infusion therapy and blood transfusion therapy. The purpose of the present invention is to provide a connector for a medical tube for transporting liquid, which can highly reliably prevent infection from .

According to the present invention, a connector for connecting flexible medical tubes for transporting liquid to be connected to each other is provided, which is connected to the connecting end of one of the tubes and is made of a heat-resistant and corrosion-resistant material and is opposite to the tube. a male connector in the form of a short tube having a male insertion end at the other end and a passage inside; a short tubular female connector having a female plug end that can be connected to the male plug end of the male connector at the other end and a flow path inside; The mating surface on the outer surface of the male plug-in end is made of a material that has a smaller thermal expansion than the mating surface on the inner surface of the female plug-in end of the female connector, and The mating surface of the insertion end of the female die and the mating surface of the inserted end of the female mold are sized to have a shrink-fit dimension difference that allows for connection and disconnection due to a difference in thermal expansion. This is accomplished by a medical tube connector for fluid delivery.

In addition, the present invention provides an extremely effective means for forming the mating surfaces of both connectors to a size that provides a shrink-fit dimension difference that allows for connection and disconnection due to a difference in thermal expansion. The female mold made of ceramic is preferably an embodiment made of a heat-resistant and corrosion-resistant metal such as stainless steel, titanium, nickel, or chrome-plated brass, or a heat-resistant and corrosion-resistant plastic material.

In addition, the present invention provides an effective means for easily obtaining a shrink-fit dimensional difference with sufficient wear resistance between the connecting and fitting surfaces of both connectors, and simultaneously achieving liquid-tight fitting. A face-fitting embodiment is preferred.

Further, in the present invention, each connector is preferably connected to a tube whose entire length is made of silicone rubber, as an effective means to prevent thermal denaturation and thermal deformation from occurring and to reduce the number of manufacturing steps.

In addition, the present invention provides that each connector is connected to a soft nonwoven material such as vinyl chloride or polyethylene via a short tubular tube made of silicone rubber or tetrafluoroethylene resin, as an effective means to reduce the occurrence of thermal denaturation and thermal deformation and to reduce costs. Preferably, the embodiment is in communication with a tube made of a heat-resistant plastic material.

Further, in order to achieve a reliable liquid-tight connection between both connectors, the present invention is preferably implemented in such a manner that the coupling fitting surface has at least one sealing member for liquid-tight connection of both connectors.

Further, in the present invention, a cylindrical support made of a heat insulating material is fitted on each tube side of both connectors in order to enable each connector to be held more stably with bare hands when connecting and disconnecting the connectors. It is preferable to use an embodiment in which In this embodiment, a support made of silicone rubber is further forcibly fitted onto the outer surface of the end of the tube to tighten the tube to the connector, or a support made of silicone rubber, cork or glass fiber reinforced resin is used. It is preferable to adopt an embodiment in which the support body is fitted onto the outer surface of the connector halfway toward the tube, excluding the tube.

() Detailed Description of the Present Invention (-1) Configuration As shown in FIG. 2, the connector of the medical tube for liquid conveyance of the present invention connects flexible medical tubes for liquid conveyance P ₁ to be connected to each other. and _P2 , the male connector A is connected to the connecting end of one tube _P1 , and the female connector B is connected to the connecting end of the other tube _P2 .

The male connector A is made of ceramics such as zirconia oxide, silicon nitride, alumina, steatite, and forsterite, and has a flange 12 in the middle of the outer surface as shown in _FIG . A male tube insertion end having a male insertion end 13 on the opposite side, and a male tapered cylindrical surface whose connecting end with tube P ₁ becomes smaller in diameter toward the end surface. 14, and is formed into a short tube shape with a passage 15 inside. The male insertion end 13 consists of a male tapered cylindrical surface 13a whose diameter becomes smaller toward the end surface, and a cylindrical outer surface 13b formed between the male tapered cylindrical surface 13a and the flange 12. Further, the female connector B is made of stainless steel.
A male taper made of heat-resistant and corrosion-resistant metal such as titanium, nickel or chrome-plated brass, or heat-resistant and corrosion-resistant plastic material, and the connecting end with tube P ₂ becomes smaller in diameter toward the end face, as shown in Figure 3. A male tube insertion end 16 having a cylindrical surface, and a female plug whose opposite end can accommodate and connect the male insertion end 13 of the male connector A. It is formed into a short tube shape with an end portion 17 and a flow path 18 communicating with the passage 15 inside. The plugged end portion 17 has the male tapered cylindrical surface 1 of the male connector A on the depth side.
3a for liquid-tight connection, and has a female tapered cylindrical surface 17a having a smaller diameter in the depth direction, and the end surface side has a diameter of one turn from the cylindrical outer surface 13b that accommodates the cylindrical outer surface 13b of the male connector A. It has a large cylindrical inner surface 17b. A heat-resistant and corrosion-resistant O-ring-shaped seal member 19 is fitted into an annular groove provided in the middle of the cylindrical inner surface 17b.

Therefore, the male connector A and the female connector B have a structure in which the liquid-tight connection between the tapered cylindrical surfaces 13a and 17a and the liquid-tight connection between the seal member 19 can sufficiently prevent liquid leakage from the connector connection location. . Then, as described above, the male insertion end 1
The fitting surface portion of No. 3 is a male tapered cylindrical surface 13a,
In addition, since the mating surface of the female insertion end 17 is the female tapered cylindrical surface 17a that completely matches the male tapered cylindrical surface 13a, in other words, the two mating surfaces are connected and separated due to the difference in thermal expansion. The size is such that there is a shrink-fitting dimensional difference that allows for shrink-fitting. Male connector A
The materials of the and female connector B are not limited to those mentioned above, and both may be made of a heat-resistant and corrosion-resistant material, and the male connector A may be made of a material with a smaller thermal expansion than the female connector B. For example, a combination of heat-resistant and corrosion-resistant metal materials or a combination of a heat-resistant and corrosion-resistant metal material and a heat-resistant and corrosion-resistant plastic material may be used. When the male connector A is made of ceramics among the above-mentioned materials, the thermal conductivity is extremely low, so it is preferable because it can be connected to the tube _P1 made of an inexpensive soft non-heat resistant material such as vinyl chloride or polyethylene. In addition, when the female connector B is made of a heat-resistant and corrosion-resistant metal material, it is connected to a tube P ₂ made of silicone rubber or tetrafluoroethylene resin in consideration of thermal conductivity. The sealing member 19 is preferably provided in the female connector B, but may also be provided in the male connector A.
When the seal member 19 is provided in the male connector A, a material made of a material with sufficiently high heat and corrosion resistance is selected.

(-2) Effects The effects of the present invention will be explained with reference to a liquid transport device used in continuous mobile peritoneal dialysis, which is constructed using the connector according to the present invention, as shown in FIG.

Therefore, to briefly explain the liquid conveyance device,
21 is a container containing a chemical solution, 22 is a transport tube, 23
is the first connector, 24 is the breaking member, and 25 is the second connector.
26 is an extension tube, 27 is a third connector, 28 is a fourth connector, 29 is an indwelling type catheter, and 30 is a clamp. This liquid transport device is different from the liquid transport device shown in FIG.
The liquid path provided inside the connector 2 is closed in a state where it can be opened by the rupture member 24, and the female connector B according to the coupling device of the present invention is used for the first connector 23 and the third connector 27. Further, the second connector 25 and the fourth connector 28 use the male connector A according to the coupling device of the present invention. In addition, the above first, second,
Third and fourth connectors 23, 25, 27, 2
8 may be installed with the male and female types reversed. It is also assumed that each component has been sterilized in advance.

To perform the first injection of a drug solution into the abdominal cavity, the indwelling type catheter 29 is implanted in the abdominal cavity, and both the fourth connector 28 at the outer end of the indwelling type catheter 29 and the third connector 27 at one end of the extension tube 26 are connected to an Alur lamp or the like. After heating with a flame, the connectors are mated, and then the connectors are pressed together in the mated state and allowed to cool down naturally for a short period of time, and the connection is achieved by shrink fitting. Next, the container 21 is suspended at a predetermined height and the first connector 23 at the tip of the transport tube 22 is
and the second connector 2 at the other end of the extension tube 26.
5 are heated with flame in the same manner as above, then fitted, cooled naturally, and connected by shrink fitting. The shrink-fit connection between the connectors is sufficient because the connection fitting surface of the female connector is a tapered cylindrical surface fitting made of a material with higher thermal expansion than the connection fitting surface of the male connector, and is heated strongly. The connection strength is excellent, and the connectors will not come apart on their own unless heated or a considerable external force is applied to both connectors, and since the connectors are fitted with tapered cylindrical surfaces, the connectors are liquid-tight. Fitting is ensured with sufficient durability. Once the connectors have been connected, the breaking member 24 is broken and the transportation tube 22 is removed.
Open the clamp 30 and extend the extension tube 26.
Container 2 by opening
The drug solution in 1 is injected into the abdominal cavity by the action of gravity, and when the injection is finished, the extension tube 26 is pinched and crushed with the clamp 30 to close and occlude it, thereby completing the first drug solution injection operation. If the container 21 is rolled up, the transport tube 22, the extension tube 26, and the indwelling catheter 29 are bundled together and tied around the waist or the like, walking or working is possible. To renew the dialysis for the second and subsequent times, the patient can remove the container 21 from his waist, stretch it out flat, place it on the floor, etc., and loosen the clamp 30. Then, the dialysis waste fluid in the peritoneal cavity is collected into the container 21 by the action of gravity. Then, the container 21, the transport tube 22, the wave breaking member 24 and the first
Since connector 23 is disposable, clamp 3
0, first connector 23 and second connector 2
Heat the connection part 5 again with the flame of an alcohol lamp or the like to disconnect the connectors. Before disconnecting the connection, first hang a new container containing the chemical solution at a high place and place it in the tube. Keep the first connector at the tip in place and have it ready at hand. Next, the first connector 23 and the second connector 25 to be separated are heated with a flame of an alcohol lamp or the like, and a separating force is applied to both connectors to separate them. As in the case of connection, the female connector is heated more strongly than the male connector, and the disconnection of the connectors is easily achieved due to the difference in thermal expansion. After separating the first connector 23 and the second connector 25, while heating the second connector 25 over the flame, remove the cap of the first connector prepared at hand, heat it over the flame, and then heat the second connector 25 over the flame. The connector 25 and the first connector may be fitted together and the shrink-fit connection may be achieved by natural cooling. However, heating is required to connect and disconnect the connectors, and the tapered cylindrical surface fitting achieves a fluid-tight fit.Furthermore, the disconnection and connection operations can be performed aseptically, so bacteria in the abdominal cavity can be removed from the connector part. It can prevent the entry of microorganisms such as viruses, and since the connector is made of heat-resistant and corrosion-resistant material, chemical changes such as rust and surface changes do not occur even when heated, completely preventing the occurrence of peritonitis. can.

() Modifications of the present invention (-1) First modification FIG. 5 shows a modification to obtain a connector with low manufacturing cost. The male connector A consists of an insertion cylinder 31 made of ceramics and having a male tapered cylinder surface 31a, and a hand-held cylinder 32 made of heat-resistant hard plastic and threadedly connected to the insertion cylinder 31. Female connector B is made of stainless steel, titanium,
Alternatively, an inserted cylinder 33 having a female tapered cylindrical surface 33a made of a heat-resistant and corrosion-resistant metal material such as nickel or chrome-plated brass, and a heat-resistant hard plastic that is threadedly connected to the inserted cylinder 33. A sealing member 35 is provided inside the inserted cylinder 33. The hand-held cylinders 32 and 34 are each connected to a tube P ₁ or P ₂ made of a soft non-heat resistant material such as vinyl chloride or polyethylene.

(-2) Second Modified Example FIG. 6 shows a modified example in which the connected fitting is performed not by the tapered cylindrical surface but by the connected cylindrical surface having the same diameter in the longitudinal direction. The male connector A is made of ceramics, and the insertion end 36 with the female connector B has a cylindrical outer surface 36a having the same diameter in the longitudinal direction, and the female connector B is made of stainless steel, titanium, nickel, or chrome plating. It is made of a heat-resistant and corrosion-resistant metal such as brass or a heat-resistant and corrosion-resistant plastic material, and the end portion 37 to be inserted into the male connector A has a cylindrical inner surface 37a having the same diameter in the longitudinal direction. Then, when the outer diameter of the cylindrical outer surface 36a is heated to be slightly larger than the inner diameter of the cylindrical inner surface 37a, the outer diameter and inner diameter are reversed due to the difference in thermal expansion, resulting in a shrink-fit dimension difference that allows connection and disconnection. There is. A sealing member 38 provided at the deep end of the cylindrical inner surface 37a is in close contact with the insertion end face of the male connector A all around the circumference to achieve a liquid-tight connection between the connectors.

(-3) Third Modification Figure 7 shows a modification in which the heat resistance of the tube is taken into account when each connector is made of a heat-resistant and corrosion-resistant metal material so that it can withstand connection and disconnection due to heating. The male connector A and the female connector B are each fitted with a short connecting tube 39 or 40 made of silicone rubber or tetrafluoroethylene resin, and the connecting tubes 39 and 40 are made of a soft non-woven material such as vinyl chloride or polyethylene. Connected to tube P ₁ or P ₂ made of heat-resistant material.

(-4) Fourth Modified Example FIG. 8 shows a modified example in which the connector is made of a heat-resistant and corrosion-resistant metal material, which is stable and easy to hold, and which allows the connector to be held and heated with bare hands.

A tube P ₁ or P ₂ made of silicone rubber or tetrafluoroethylene resin is fitted over the entire length of _the male connector _A and female connector B, respectively. A cylindrical support 41 or 42 made of silicone rubber, cork, tetrafluoroethylene resin, glass fiber reinforced resin, etc. is forcibly fitted into the tube P ₁ or P ₂ .
is held in the connector.

(-5) Fifth Modification Figure 9 also shows a modification equipped with a support. The male connector A is made of ceramics with low thermal conductivity and is directly connected to the tube _P1 made of a soft non-heat resistant resin, eliminating the need for a support. The female connector B is made of a heat-resistant and corrosion-resistant metal material such as stainless steel, titanium, nickel, or chrome-plated brass. It is directly fitted into the female connector B near the tube _P2 , and is further connected to the tube ₂ made of a soft non-heat resistant resin via a connecting tube 44 made of silicone rubber or tetrafluoroethylene resin.

(-6) Sixth modification Figure 10 shows a modification in which the locking means are doubled. Both connectors can be connected and disconnected by heating, but the lock nut 45
Both connectors can be connected with a high level of safety.

() Effects As explained above, the connector of the medical tube for liquid transport of the present invention is connected to each of the flexible medical tubes to be connected to each other, and has a male insertion end or a male insertion end that is fitted therein. A pair of short tubular male and female connectors each having a female plug-in end, the plug-in end and the plug-in end being made of a heat-resistant and corrosion-resistant material, and a plug-in end. The mating surface of the part is made of a material with smaller thermal expansion than the mating surface of the inserted end, and the two mating surfaces are sized to have a shrink-fit dimension difference that allows connection and disconnection due to the difference in thermal expansion. And so.

Therefore, in the liquid transport medical tube connector of the present invention, the insertion end and the insertion end of a pair of connectors are heated by flame to fit together, and the connectors are separated from the flame and connected by natural cooling. In addition, if you hold each base end of a pair of connected connectors in your hand and heat the approximately central connection point with flame and apply a tensile force to each other, the pair of connectors will be separated, but unless heated, they will not be connected. Moreover, it does not cause any chemical changes such as rust or surface changes due to heating, so even if a pair of connectors are repeatedly connected and disconnected over a long period of time, bacteria and viruses will not occur. A pair of connectors is designed to prevent microorganisms such as microorganisms from entering through the connection points, and if there is a firearm such as an alcohol pump or stove, the patient himself at home or at work can also use a pair of connectors to prevent microorganisms from entering through the connection points. Connection and disconnection can be performed reliably and easily.

Therefore, if treatment is performed using a liquid transfer device using the medical tube connector for liquid transfer of the present invention, the connection and disconnection of the connectors can be performed reliably and sterilely using a firearm, thereby preventing the peritoneum from being damaged. When dialysate is repeatedly injected and drained into the peritoneal cavity, which has no antibacterial activity, such as in dialysis, it is used to prevent the complications of peritonitis caused by bacteria entering the peritoneal cavity from the connection point, and has been carried out to this day. It has the excellent effect of completely removing the barrier that has been difficult to implement for a long time because it cannot prevent microorganisms from entering the peritoneal cavity from the urinary joint connection point, as typified by peritoneal dialysis. Moreover, according to the present invention, the patient can perform the operation of disconnecting and reconnecting the connection by himself/herself, making it ideal as a connecting device for a continuously movable peritoneal dialysis tube.

Furthermore, according to the present invention, since the connectors are connected to each other by a plug-in type, the connection can be made without twisting the tubes, so the connection between the connectors can be made smooth, and since the connection is by shrink fitting, it is extremely strong. From this point of view, it can be suitably applied to continuous and mobile peritoneal dialysis, in which external forces such as tension, compression, and moment may normally act on the connector, and the connector can be connected without the patient knowing. There is almost no chance of it coming undone.

Further, as an embodiment of the present invention, when the male connector is made of ceramics and the female connector is made of stainless steel, titanium, or a heat-resistant and corrosion-resistant metal such as nickel or chrome-plated brass, or a heat-resistant and corrosion-resistant plastic material, Since the connecting mating surface of the connector hardly expands thermally, the inner diameter of the connecting mating surface of the female connector is made smaller than the outer diameter of the connecting mating surface of the male connector by a minute dimension, so that the dimensions are reversed due to the difference in thermal expansion. It is possible to widen the size range in which shrink fitting is possible.

In addition, as an embodiment of the present invention, when the connecting fitting surface of the male connector and the connecting fitting surface of the female connector are tapered cylindrical surface fitting, the connecting fitting surfaces of both connectors are processed to enable shrink fitting. It is extremely easy to connect the connectors together, and a highly wear-resistant shrink-fit connection and a liquid-tight connection can be achieved at the same time.

Further, in an embodiment of the present invention, when each connector is connected to a tube whose entire length is made of silicone rubber, the tube is not thermally denatured or deformed, and the number of manufacturing steps can be reduced.

Further, as an embodiment of the present invention, each connector is connected to vinyl chloride, via a short connecting tube made of silicone rubber or tetrafluoroethylene resin,
When connected to a tube made of soft non-heat resistant plastic material such as polyethylene, it becomes a connector with a connecting tube, but the manufacturing cost is not high, the connection with the tube is easy, and the tube can be manufactured at low cost. This means that the liquid transport device can be provided at low cost.

Further, as an embodiment of the present invention, when the coupling fitting surface has a sealing member for liquid-tightly connecting both connectors, a sufficiently reliable liquid-tight fitting can be achieved.

Further, as an embodiment of the present invention, if a cylindrical support made of a heat insulating material is fitted on the tube side of each connector, even if the connector is made of a metal material, it can be held directly with bare hands. It is stable and easy to hold, making it much easier for patients to perform treatment operations themselves. In addition, in this embodiment, if the support body made of silicone rubber is forcibly fitted onto the outer surface of the end of the tube and the tube is tightened to the connector, the silicone rubber has no heat shrinkage or heat fusibility and is elastic. The large dosing tensile strength allows for better attachment of the connector to the support and at the same time provides a more secure fit between the tube and the connector. In addition, if a support made of tetrafluoroethylene, cork, or glass fiber reinforced resin is directly fitted and fixed with adhesive to the tube side of the connector, excluding the connecting tube, these supports will not have elasticity or tensile strength. Proper and good installation.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram for explaining the continuous mobile peritoneal dialysis method currently practiced. FIGS. 2 and 3 are a sectional view of a connected state and a dissociated state of a connecting device for a medical tube for transporting liquid according to an embodiment of the present invention. FIG. 4 is a schematic diagram illustrating a new continuous mobile peritoneal dialysis method using the connector of the present invention. FIG. 5 is a cross-sectional view of a modified example of the connector of the present invention, in a disassembled state, in which male and female connectors are made of ceramic and metal, respectively, with only the connecting ends heated by flame made of ceramics and metal.
FIG. 6 is a cross-sectional view of a modified example of the connector of the present invention in a disengaged state in which the connecting fitting surface heated by a flame is formed into a cylindrical surface having the same diameter in the longitudinal direction. 7th
The figure shows a modification of the connector of the present invention, which includes a connecting tube made of silicone rubber so that when the connector is made of a metal material, the tube can be made of an inexpensive soft non-heat-resistant plastic material. FIG. FIG. 8 is a front view of a modified example of the connector of the present invention in a connected state in which a support made of a heat insulating material is provided from the outer surface of a tube connecting the bases of both connectors made of a metal material. FIG. 9 is a front view of a modified example of the connector of the present invention in a connected state in which one female connector made of a metal material of a support made of a heat insulating material is provided with the tube removed.
FIG. 10 is a partially sectional front view of a modified example of the connector of the present invention in a connected state that is equipped with a lock nut and can be locked in a double manner. A...Male connector, B...Female connector, _P1 , _P2 ...Tube, 13...Plug-in end, 1
3a... Fitting surface (tapered cylindrical surface), 15... Passage, 17... End to be inserted, 17a... Fitting surface (tapered cylindrical surface), 18... Channel, 19... Seal member, 31... Insertion cylinder body, 33... Insertion cylinder body, 3
5... Seal member, 36... Insertion end, 36a...
...Mating surface (cylindrical outer surface), 37 ... Plugged end, 3
7a... Fitting surface (cylindrical inner surface), 38... Seal member, 39, 40... Connection tube, 41, 42,
43...Support body, 44...Connection tube.

Claims (1)

[Scope of Claims] 1. In a connector for connecting flexible medical tubes for transporting liquids to be connected to each other, a connector connected to the connecting end of one of the tubes and made of a heat-resistant and corrosion-resistant material on the opposite side of the tube a male connector in the form of a short tube having a male insertion end at the other end and a passage inside; and the other end, which is connected to the connecting end of the other tube and is made of a heat-resistant and corrosion-resistant material, and is opposite to the tube. and a short tubular female connector having a female plug end that can be connected to the male plug end of the male connector and having a flow path inside. The mating surface on the outer surface of the insertion end of the mold is made of a material with a smaller thermal expansion than the mating surface on the inner surface of the female plug end of the female connector, and For liquid conveyance, characterized in that the mating surface portion of the insertion end portion and the mating surface portion of the female plugged end portion are sized to have a shrink-fit dimension difference that allows connection and dissociation due to a difference in thermal expansion. Medical tube connector. 2 The mating surface of the male connector is made of ceramics, and the mating surface of the female connector is made of stainless steel, titanium, nickel, or chrome-plated brass, a heat-resistant and corrosion-resistant metal, or a heat-resistant and corrosion-resistant plastic material. A connector for a medical tube for transporting liquid according to claim 1. 3. Claim 1, wherein the mating surface of the male plug end of the male connector and the mating surface of the female plug end of the female connector are tapered cylindrical surface fittings. Or a connector for a medical tube for transporting liquid according to item 2. 4. A connector for a medical tube for liquid transport according to claim 1, 2, or 3, wherein the male connector and the female connector are each connected to a tube whose entire length is made of silicone rubber. . 5 The male connector and the female connector each have a short connecting tube made of silicone rubber or tetrafluoroethylene resin at the end opposite to the other connector, and each of the connecting tubes is made of vinyl chloride, polyethylene, etc. A connector for a medical tube for transporting liquid according to claim 1, 2 or 3, which is connected in communication with the tube made of a soft non-heat resistant plastic material. 6. Claim No. 6, wherein either one of the two connectors has at least one sealing member on the insertion end or the insertion end that can connect the two connectors in a liquid-tight manner. 1st term, 2nd term, 3rd term,
A connector for a medical tube for transporting liquid according to item 4 or 5. 7. Both of the above-mentioned connectors are fitted with a cylindrical support made of a heat insulating material on the side of each tube.
A connector for a medical tube for transporting liquid according to item 1, 5 or 6. 8. The connector for a medical tube for liquid transport according to claim 7, wherein the support is made of silicone rubber and is forcibly fitted over the outer surface of the fitting end of the tube that is forcibly fitted to each of the two connectors. . 9. The liquid according to claim 7, wherein the support is made of tetrafluoroethylene resin, cork, or glass fiber reinforced resin and is fitted and fixed to the fitting end of the connector or the tube forcefully fitted thereto. Connector for medical tubes for transportation.