CN215135905U - Medical catheter transition joint - Google Patents

Abstract

The utility model discloses a medical catheter transition joint, which comprises a joint body and a joint cap, wherein the joint body is provided with three end heads, the joint cap can be detachably arranged on one end head, and the other two end heads are respectively provided with a first detachable plug and a second detachable plug; the three ends of the joint body are respectively a first joint, a second joint and a third joint, the second joint and the third joint are collinear, and the first joint, the second joint and the third joint are communicated with each other; the joint cap is connected with the first joint, the second joint is provided with a first plug, and the third joint is provided with a second plug. The medical catheter transition joint has the advantages that the medical catheter transition joint adopts a simple mechanical structure, and is convenient for a user to operate.

Description

Medical catheter transition joint

Technical Field

The utility model relates to a medical instrument, concretely relates to medical catheter transition joint.

Background

In hospitals, doctors usually use the catheter transition joint during operations, the catheter transition joint mainly has the function of being connected with other catheters during operations, and the catheter transition joint has the problem of liquid leakage during the use process due to the use of the catheter transition joint.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem of providing a medical catheter transition joint aiming at the technical problem; the method is realized by the following technical scheme: a medical catheter transition joint comprises a joint body and a joint cap; the connector body is provided with three end heads, the connector cap is detachably arranged on one end head, and the other two end heads are respectively provided with a first detachable plug and a second detachable plug; the three ends of the joint body are respectively a first joint, a second joint and a third joint, the second joint and the third joint are collinear, and the first joint, the second joint and the third joint are communicated with each other; the joint cap is connected with the first joint, the second joint is provided with a first plug, and the third joint is provided with a second plug; the first joint comprises an elastic piece, an outer joint body and an inner joint body, the outer joint body is a circular tube with an open upper end and a closed lower end, the bottom of the outer joint body and the joint body are in an integral structure, the inner joint body is a circular tube which is communicated up and down, the inner joint body is coaxial with the outer joint body, the lower end of the inner joint body is connected with the bottom of the outer joint body, a gap is arranged between the outer surface of the inner joint body and the inner surface of the outer joint body, and the height of the outer joint body is higher than that of the inner joint body; a through hole for inserting the elastic piece is formed in the bottom of the outer joint body, a through hole for inserting an external pipe is formed in the elastic piece, the through hole is positioned in the inner joint body, the middle part of the elastic piece is embedded in the through hole, the upper part of the elastic piece is positioned in the inner joint body, and the lower part of the elastic piece is positioned in the joint body; the outer surfaces of the upper part and the lower part of the elastic part are conical surfaces, and the small ends of the upper part and the lower part are both two ends of the elastic part; the joint cap comprises a cap cover, a pipe extension channel pipe and a connector, the pipe extension channel pipe and the cap cover are vertically arranged and are of an integrated structure, and the pipe extension channel of the pipe extension channel pipe penetrates through the cap cover; the connector is a circular tube which is communicated up and down, the connector is coaxial with the tube extension channel tube and is sleeved outside the tube extension channel tube, and a space for the outer joint body and the inner joint body to enter is reserved between the inner surface of the connector and the outer surface of the tube extension channel tube; the connector is in threaded connection with the outer joint body, so that the connection between the joint cap and the first joint is realized; the front end channel opening of the tube extension channel tube is a conical opening, and the conical opening is clamped on the conical surface at the upper part of the elastic piece; two limiting shaft shoulders are arranged on the outer surface of the pipe extension channel pipe, one of the limiting shaft shoulders is matched with the upper end surface of the inner joint body, and the other limiting shaft shoulder is matched with a circle of convex ring which is arranged on the inner surface of the inner joint body in a protruding mode; an end face sealing ring and a first axial sealing ring are respectively arranged at the positions of two limiting shaft shoulders on the outer surface of the pipe extension channel pipe.

The utility model discloses a medical catheter transition joint, the elastic component on the first joint and the interior connector body and connect the pipe on the cap to draw the connection of passageway pipe and connector and spacing to and the cooperation of sealing washer, the laminating of the end conical surface of pipe draw the passageway pipe and the outer conical surface of elastic component, combine the diameter of pipe, when liquid input, can play the state that a block is not leaked the liquid, this medical catheter transition joint, what adopt is simple mechanical structure, convenient to use person operates.

For the medical catheter transition joint of the utility model, the joint body comprises a section of straight pipe and a section of bent pipe, one end of the bent pipe is connected with the straight pipe, and the other end of the bent pipe is a first joint; the two ends of the straight pipe are respectively provided with a second joint and a third joint, and the first joint and the second joint are positioned on the same side of the joint body. The joint body adopts the combination of a straight pipe and an elbow pipe, and the elbow pipe plays a role of buffering liquid.

For the medical catheter transition joint of the utility model, the third joint comprises a third inner joint body and a third outer joint body; the third inner joint body and the third outer joint body are coaxial, the third inner joint body is a circular tube which is communicated up and down, the outer circle is in a step shape with two steps, namely, three sections of outer circles with different diameters are arranged, the outer circle of the middle section is provided with external threads, the inner circle is an inner hole with the same diameter, the third inner joint body and one end of a straight tube in the joint body are in an integrated structure, and connection of the third joint and the joint body is achieved; the third outer joint body is a circular tube which is communicated up and down, the outer circle is of the same outer diameter, the inner circle is of a stepped inner diameter with a step, namely two sections of two different inner diameters, an inner thread is arranged on the smaller inner diameter, an inner thread which can be connected is also arranged on the larger inner diameter, a second axial sealing ring is arranged at the joint of the two sections of the inner circle with different inner diameters, the smaller inner thread on the inner surface of the third outer joint body is in threaded connection with one section of outer thread on the outer surface of the third inner joint body, a gap is reserved between the larger inner diameter of the third outer joint body and the smaller outer diameter of the third inner joint body, and a second plug is arranged at the other end of the third joint.

The third inner joint body and the third outer joint body are combined into a third joint, and the third inner joint body and the third outer joint body adopt a detachable threaded connection mode.

Right the utility model discloses a medical catheter transition joint, the second connects, and the second connects is the pipe that link up from top to bottom of the rank form, and the second connects less one end and connects the body as an organic whole and connect, the first end cap of other end threaded connection that the second connects.

For the medical catheter transition joint of the utility model, the second plug comprises a plug cap and a plug body, the plug cap is a cap which is composed of a bottom and a circular tube which runs through from top to bottom and has an opening on the bottom and the bottom, the plug body is arranged at the bottom of the plug cap and is concentric with the plug cap, and the plug body is a circular tube which runs through from top to bottom; the inner circle of the plug body in the second plug can accommodate the third inner joint body, so that the second plug and the third joint can be detached.

Right the utility model discloses a medical catheter transition joint, end face seal, first axial seal and second axial seal, end face seal is that an excircle has the sealing washer of two circular arc breachs, and first axial seal is O type sealing washer, and second axial seal is that the centre on excircle surface opens the sealing washer that has the V-arrangement groove.

Compared with the prior art, the utility model beneficial effect who has is:

1. the technical scheme of the utility model, the elastic component in the first joint and the interior joint body and the joint cap in the pipe stretch the passageway pipe and be connected of connector, the cooperation sealing washer combines the problem that the solution weeping that the pipe energy of introducing can be better, and second joint and third joint department all are equipped with the end cap, can prevent that the dust from getting into.

2. The technical scheme of the utility model, what adopt is simple mechanical structure, convenient to use person operates.

Drawings

FIG. 1 is a first structural view of a conduit transition joint.

FIG. 2 is a cross-sectional view of a first configuration of a conduit transition joint.

Fig. 3 is an enlarged view of a portion of the conduit transition joint shown in fig. 2.

Fig. 4 is an enlarged view of portion B of the conduit transition joint of fig. 2.

Fig. 5 is an enlarged view of section C of the conduit transition joint of fig. 2.

Fig. 6 is a schematic view of an end seal.

Fig. 7 is a schematic view of a first axial seal ring.

Fig. 8 is a schematic view of a second axial seal ring.

Detailed Description

The technical solution in the embodiment of the present invention will be described in detail with reference to fig. 1 to 8 in the embodiment of the present invention.

Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention based on the embodiments of the present invention. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, and the two elements may be connected through an intermediate medium.

Example 1

As shown in fig. 1 and 2, a transition joint for medical catheters is characterized in that: comprises a joint body 1 and a joint cap 3; there are three ends on connecting body 1, connect cap 3 and can dismantle the setting on one of them end, all set up first end cap 6 of detachable and second end cap 7 on two other ends.

As shown in fig. 1 and 2, three ends of the joint body 1 are respectively a first joint 2, a second joint 4 and a third joint 5, the second joint 4 and the third joint 5 are collinear, and the first joint 2, the second joint 4 and the third joint 5 are communicated with each other; the joint cap 3 is connected with the first joint 2, the second joint 4 is provided with a first plug 6, and the third joint 5 is provided with a second plug 7.

As shown in fig. 3, the first joint 2 includes an elastic member 21, an outer joint body 22 and an inner joint body 23, the outer joint body 22 is a circular tube with an open upper end and a closed lower end, the bottom of the outer joint body 22 is integrated with the joint body 1, the inner joint body 23 is a circular tube which is vertically penetrated, the inner joint body 23 is coaxial with the outer joint body 22, the lower end of the inner joint body 23 is connected with the bottom of the outer joint body 22, a gap is arranged between the outer surface of the inner joint body 23 and the inner surface of the outer joint body 22, and the outer joint body 22 is higher than the inner joint body 23; a through hole for inserting the elastic piece 21 is formed in the bottom of the outer joint body 22, a through hole 21-1 for inserting an external pipe is formed in the elastic piece 21, the through hole 21-1 is positioned in the inner joint body 23, the middle part of the elastic piece 21 is embedded in the through hole, the upper part of the elastic piece 21 is positioned in the inner joint body 23, and the lower part of the elastic piece 21 is positioned in the joint body 1; the outer surfaces of the upper and lower portions of the elastic member 21 are tapered surfaces, and the small ends of the upper and lower portions are both ends of the elastic member 21.

As shown in fig. 3, the coupling cap 3 includes a cap cover 31, a tube extension passage tube 32 and a coupling body 33, the tube extension passage tube 32 is vertically disposed to the cap cover 31 and is an integrated structure, and the tube extension passage 32-1 of the tube extension passage tube 32 penetrates the cap cover 31; the connector 33 is a circular tube which is penetrated up and down, the connector 33 is coaxial with the tube extension channel tube 32 and is sleeved outside the tube extension channel tube 32, and a gap for the outer joint body 22 and the inner joint body 23 to enter is reserved between the inner surface of the connector 33 and the outer surface of the tube extension channel tube 32; the connector 33 is in threaded connection with the outer joint body 22, so that the joint cap 3 is connected with the first joint 2; the front end passage opening of the tube extension passage 32-1 of the tube extension passage tube 32 is a cone opening which is clamped on the conical surface at the upper part of the elastic part 21; two limiting shaft shoulders 32-2 are arranged on the outer surface of the pipe extension channel pipe 32, one of the limiting shaft shoulders is matched with the upper end surface of the inner joint body 23, and the other limiting shaft shoulder is matched with a circle of convex ring 23-1 which is convexly arranged on the inner surface of the inner joint body 23; the outer surface of the pipe extension passage pipe 32 is provided with an end face seal ring 8 and a first axial seal ring 9 at two positions of a limit shaft shoulder 32-2 respectively.

The first connector 2 and the connector cap 3 are both made of medical plastics with hardness, the elastic piece 21 is made of medical rubber, the outer connector body 22 in the first connector 2 is integrally formed with the connector body 1, the inner connector body 23 is in hot melting connection with the outer connector body 22, the convex ring 23-1 is in hot melting connection with the inner surface of the inner connector body 23, the position of the convex ring 23-1 is determined to be matched with the position of the first axial sealing ring 9 on the pipe extension channel pipe 32 in the connector cap 31, the elastic piece 21 is installed in a through hole formed in the bottom of the outer connector body 22, the front end conical opening of the pipe extension channel 32-1 of the pipe extension channel pipe 32 in the connector cap 3 is clamped with the front end conical opening of the pipe extension channel pipe 32-1 in the connector cap 3 when the connector 33 in the connector cap 3 is in threaded connection with the outer connector body 22 in the first connector 2, the upper outer conical surface of the elastic piece 21 in the first connector 2 is clamped with the front end conical opening of the pipe extension channel pipe 32-1 in the connector cap 3, the inserted conduit is combined, the elastic piece 21 is in interference fit with the inserted conduit, and liquid cannot leak between the elastic piece 21 and the conduit inserted into the through hole 21-1; one position of the two limiting shaft shoulders 32-2 is matched with the upper end face of the inner connector 23, the other position of the two limiting shaft shoulders is matched with the circle of convex ring 23-1 of the inner connector 23, namely, one end face seal ring 8 of the two shaft shoulders 32-2 is matched with the upper end face of the inner connector 23, one first axial seal ring at the two shaft shoulders 32-2 is matched with the circle of convex ring 23-1 of the inner connector 23, and the combination of the end face seal ring 8 and the first axial seal ring 9 effectively solves the problem of liquid leakage between the outer surface of the elastic element 21 and the embedded through hole formed in the outer connector 22.

The cap 31, the tube extension passage tube 32 and the connector 33 in the connector cap 3 are integrally processed, when the connector cap 3 and the first connector 2 are screwed tightly, two limit shaft shoulders of the tube extension passage tube 32 play a role in limiting, one limit shaft shoulder 32-2 of the tube extension passage tube 32 is provided with an annular groove matched with the end face seal ring 8, a semi-arc ear attached to an arc notch of the end face seal ring 8 is reserved, and the other limit shaft shoulder 32-2 is provided with an axial groove matched with the first axial seal ring 9.

As shown in fig. 2, the joint body 1 comprises a straight pipe 11 and an elbow pipe 12, one end of the elbow pipe 12 is connected with the straight pipe 11, and the other end of the elbow pipe 12 is a first joint 2; the two ends of the straight pipe 11 are respectively a second joint 4 and a third joint 5, and the first joint 2 and the second joint 4 are located on the same side of the joint body 1. A section of straight pipe 11 and a section of bent pipe 12 in the joint body 1 are connected in a hot melting mode, and the joint body 1 is made of medical plastics with hardness.

As shown in fig. 4, the third joint 5 includes a third inner joint body 51 and a third outer joint body 52; the third inner joint body 51 and the third outer joint body 52 are coaxial, the third inner joint body 51 is a circular tube which is through up and down, wherein the outer circle is in a step shape with two steps, namely, three sections of outer circles with different diameters, the outer circle of the middle section is provided with external threads, the inner circle is an inner hole with the same aperture, the third inner joint body 51 and one end of the straight tube 11 in the joint body 1 are in an integral structure, and the connection of the third joint 5 and the joint body 1 is realized; the third outer joint body 52 is a circular tube which is through up and down, the outer circle is the same outer diameter, the inner circle is a step-shaped inner diameter with a step, namely two sections with different inner diameters, a thread is arranged on the smaller inner diameter, a connectable inner thread is also arranged on the larger inner diameter, a second axial sealing ring 10 is arranged at the joint of the two sections with different inner diameters of the inner circle, a section of external thread is arranged on the outer surface of the third inner joint body 51 and connected with the smaller inner thread on the inner surface of the third outer joint body 52, a gap is reserved between the larger inner diameter of the third outer joint body 52 and the smaller outer diameter of the third inner joint body 51, and a second plug 7 is arranged at the other end of the third joint 5.

The third inner joint body 51 of the third joint 5 is integrated with one end of the straight pipe 11 of the joint body 1, the third outer joint body 52 is in threaded connection with the third inner joint body 51, the third inner joint body 51 is required to be connected, the third outer joint body 52 is detached and is connected with the external thread of the third inner joint body 51, and the third joint 5 is made of medical plastics with hardness.

As shown in fig. 5, the second joint 4 is a stepped circular tube which penetrates up and down, the smaller end of the second joint 4 is connected with the joint body 1 as a whole, and the other end of the second joint 4 is connected with the first plug 6 in a threaded manner. The second connects 4 and connects 11 one end body structures of one section straight tube in the body 1, and first end cap 6 and second connect 4 threaded connection, when needing practical second to connect 4, unscrew first end cap 6, and the time spent not, connects first end cap 6 and second and connects 4 threaded connection, and the second connects 4 and the medical plastics that first end cap 6's material all adopts to have hardness.

As shown in fig. 4, the second plug 7 includes a plug cap 71 and a plug body 72, the plug cap 71 is a cap which is composed of a bottom and a vertically penetrating circular tube and has a bottom and an opening at the top, the plug body 72 is arranged at the bottom of the plug cap 71, the plug body 72 is concentric with the plug cap 71, and the plug body 72 is a vertically penetrating circular tube; the inner circle of the plug body in the second plug 7 can accommodate the third inner joint body 51, so that the second plug 7 and the third joint 5 can be detached. The plug cap 71 and the plug body 72 of the second plug 7 are of an integral structure, and the material of the second plug 7 is medical plastic with hardness.

As shown in fig. 6, 7 and 8, the end face seal ring 8, the first axial seal ring 9 and the second axial seal ring 10, the end face seal ring 8 is a seal ring having two circular-arc notches on the outer circumference, the first axial seal ring 9 is an O-shaped seal ring, and the second axial seal ring 10 is a seal ring having a V-shaped groove in the middle of the outer circumferential surface. The end face seal ring 8, the first axial seal ring 9 and the second axial seal ring 10 are all made of environment-friendly medical rubber.

The utility model discloses a medical catheter transition joint use as follows:

when the pipe joint is used by a user, the joint cap 3 and the joint body 1 are separated, the user firstly inserts a pipe into an extension channel pipe of the joint cap 3, the pipe extending out of the joint cap 3 is inserted into the first joint 2 in the joint body 1, the pipe penetrates through the elastic piece 21 and leaks out, and the joint cap 3 is in threaded connection with the first joint 2 in the joint body 1; when the second connector 4 is used, the first plug 6 is unscrewed, a user can use the second connector, and when the second connector is not used, the first plug 6 is in threaded connection with the second connector; when the third joint 5 is used, the second plug 7 is detached and connected to the internal thread of the third joint 5, and when the third joint 5 is not used, the second plug 7 is attached to the third joint 5.

Above embodiment only is for explaining the utility model discloses a technical thought can not be injectd with this the utility model discloses a protection scope, all according to the utility model provides a technical thought, any change of doing on technical scheme basis all falls into the utility model discloses within the protection scope.

Claims (6)

1. A medical catheter transition joint, comprising: the connector comprises a connector body (1) and a connector cap (3), wherein three end heads are arranged on the connector body (1), the connector cap (3) is detachably arranged on one end head, and a first plug (6) and a second plug (7) which are detachable are arranged on the other two end heads;

three ends on the joint body (1) are respectively a first joint (2), a second joint (4) and a third joint (5), the second joint (4) and the third joint (5) are collinear, and the first joint (2), the second joint (4) and the third joint (5) are communicated with each other; the joint cap (3) is connected with the first joint (2), the second joint (4) is provided with a first plug (6), and the third joint (5) is provided with a second plug (7);

the first joint (2) comprises an elastic piece (21), an outer joint body (22) and an inner joint body (23), the outer joint body (22) is a circular tube with an upper end opened and a lower end closed, the bottom of the outer joint body (22) is integrated with the joint body (1), the inner joint body (23) is a circular tube which is vertically communicated, the inner joint body (23) is coaxial with the outer joint body (22), the lower end of the inner joint body (23) is connected with the bottom of the outer joint body (22), a gap is arranged between the outer surface of the inner joint body (23) and the inner surface of the outer joint body (22), and the outer joint body (22) is higher than the inner joint body (23);

a through hole for inserting the elastic piece (21) is formed in the bottom of the outer joint body (22), a through hole (21-1) for inserting an external pipe is formed in the elastic piece (21), the through hole (21-1) is positioned in the inner joint body (23), the middle part of the elastic piece (21) is embedded in the through hole, the upper part of the elastic piece (21) is positioned in the inner joint body (23), and the lower part of the elastic piece (21) is positioned in the joint body (1); the outer surfaces of the upper part and the lower part of the elastic part (21) are conical surfaces, and the small ends of the upper part and the lower part are both two ends of the elastic part (21);

the joint cap (3) comprises a cap cover (31), a pipe extension passage pipe (32) and a connecting body (33), the pipe extension passage pipe (32) and the cap cover (31) are vertically arranged and are of an integrated structure, and the pipe extension passage (32-1) of the pipe extension passage pipe (32) penetrates through the cap cover (31); the connector (33) is a circular tube which is penetrated up and down, the connector (33) is coaxial with the tube extension channel tube (32) and is sleeved outside the tube extension channel tube (32), and a space for the outer joint body (22) and the inner joint body (23) to enter is reserved between the inner surface of the connector (33) and the outer surface of the tube extension channel tube (32);

the connector (33) is in threaded connection with the outer joint body (22) to realize the connection between the joint cap (3) and the first joint (2);

the front end channel opening of the tube extension channel (32-1) of the tube extension channel tube (32) is a cone opening, and the cone opening is clamped on the conical surface at the upper part of the elastic piece (21); two limiting shaft shoulders (32-2) are arranged on the outer surface of the pipe extension channel pipe (32), one of the limiting shaft shoulders is matched with the upper end surface of the inner joint body (23), and the other limiting shaft shoulder is matched with a circle of convex ring (23-1) arranged on the inner surface of the inner joint body (23) in a protruding way;

an end face sealing ring (8) and a first axial sealing ring (9) are respectively arranged at the positions of two limiting shaft shoulders (32-2) on the outer surface of the pipe extension channel pipe (32).

2. The medical catheter transition joint of claim 1, wherein: the joint body (1) comprises a section of straight pipe (11) and a section of bent pipe (12), one end of the bent pipe (12) is connected with the straight pipe (11), and the other end of the bent pipe (12) is a first joint (2); two ends of the straight pipe (11) are respectively a second joint (4) and a third joint (5), and the first joint (2) and the second joint (4) are positioned on the same side of the joint body (1).

3. The medical catheter transition joint of claim 2, wherein: the third joint (5) comprises a third inner joint body (51) and a third outer joint body (52); the third inner joint body (51) and the third outer joint body (52) are coaxial, the third inner joint body (51) is a circular tube which is communicated up and down, wherein the outer circle is in a step shape with two steps, namely, three sections of outer circles with different diameters, an external thread is arranged on the outer circle of the middle section, the inner circle is an inner hole with the same aperture, and the third inner joint body (51) and one end of one section of straight tube (11) in the joint body (1) are in an integrated structure to realize the connection of the third joint (5) and the joint body (1);

the third outer joint body (52) is a circular tube which is communicated up and down, the outer circle is the same outer diameter, the inner circle is a step-shaped inner diameter with one step, namely two sections with different inner diameters, an inner thread is arranged on the smaller inner diameter, an inner thread which can be connected is also arranged on the larger inner diameter, a second axial sealing ring (10) is arranged at the joint of the two sections with different inner diameters of the inner circle, a section of external thread is arranged on the outer surface of the third inner joint body (51) and the smaller inner diameter of the third outer joint body (52), a gap is reserved between the larger inner diameter of the third outer joint body (52) and the smaller outer diameter of the third inner joint body (51), and a second plug (7) is arranged at the other end of the third joint (5).

4. The medical catheter transition joint of claim 2, wherein: the second joint (4) is a step-shaped circular tube which is penetrated up and down, the smaller end of the second joint (4) is connected with the joint body (1) into a whole, and the other end of the second joint (4) is in threaded connection with the first plug (6).

5. The medical catheter transition joint of claim 3, wherein: the second plug (7) comprises a plug cap (71) and a plug body (72), the plug cap (71) is a cap which is composed of a bottom and a vertically-penetrating circular tube, the bottom of the cap is provided with a bottom opening, the top of the cap is provided with an opening, the plug body (72) is arranged at the bottom of the plug cap and is concentric with the plug cap, and the plug body (72) is a vertically-penetrating circular tube; the inner circle of a plug body (72) in the second plug (7) can accommodate the third inner joint body (51), so that the second plug (7) and the third joint (5) can be detached.

6. The medical catheter transition joint of claim 1, wherein: the end face seal ring (8), the first axial seal ring (9) and the second axial seal ring (10), wherein the end face seal ring (8) is a seal ring with two arc notches on the excircle, the first axial seal ring (9) is an O-shaped seal ring, and the second axial seal ring (10) is a seal ring with a V-shaped groove in the middle of the excircle surface.

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