JP6922464B2 - Connection structure of tubular members - Google Patents

Description

The present invention may, for example about connecting structure of the tubular member which is used to connect the tubular member, such as a medical tube.

For example, as disclosed in Patent Document 1, an indwelling needle used in a medical field includes an outer needle base formed in a cylindrical shape and a male member formed in a tubular shape. The outer needle base is formed with an insertion hole into which a male member is inserted. The outer peripheral surface of the male member is composed of a tapered surface whose diameter becomes smaller toward the tip side in the insertion direction into the insertion hole, and the difference in the outer needle base corresponds to the shape of the tapered surface of the male member. The inner peripheral surface of the insertion hole is also tapered. Then, by inserting the male member into the insertion hole of the outer needle base, the outer peripheral surface of the male member and the inner peripheral surface of the insertion hole of the outer needle base are brought into close contact with each other to ensure the sealing property.

Japanese Unexamined Patent Publication No. 2013-9912

By the way, in the case of a structure in which a male member is connected by inserting it into an outer needle base as a female member as in Patent Document 1, in order to prevent liquid leakage from between the male member and the female member, the male member It is necessary to improve the sealing property between the outer peripheral surface and the inner peripheral surface of the female member. In order to improve the sealing performance, there is a method of using a sealing material separately, but in this case, the number of parts increases, so the outer peripheral surface of the male member and the inner peripheral surface of the female member are smoothed without using the sealing material. There is a method of securing a wide contact area and sealing. As one of the means, for example, it is conceivable to make the outer peripheral surface of the male member and the inner peripheral surface of the female member close to the mirror surface to minimize the unevenness of the peripheral surfaces.

When the outer peripheral surface of the male member and the inner peripheral surface of the female member are made close to a mirror surface as described above, the sealing property can be improved, but for example, an oily liquid is present on the outer peripheral surface of the male member and the inner circumference of the female member. When it adheres to the surface, by inserting the female member into the male member, the liquid spreads between the outer peripheral surface of the male member and the inner peripheral surface of the female member, forming a film (oil film). Since this film is interposed between the male member and the female member, for example, when a tensile force acts on the female member in the pulling direction, the female member is male even when the tensile force is weak. There is a risk that it will easily come off the member. This means that it is not possible to achieve both high sealing performance and high tensile strength. Achieving both high sealing performance and high tensile strength is strongly desired not only in general connection structures but also in connection structures used for medical instruments and the like.

The present invention has been made in view of this point, and an object of the present invention is to achieve both high sealing performance and high tensile strength when connecting a tubular member by inserting a female member into a male member. To do.

In order to achieve the above object, in the present invention, by forming a sealing surface portion on the tip side in the insertion direction of at least one peripheral surface of the outer peripheral surface of the male member and the inner peripheral surface of the female member, a high seal is formed on the tip side. High tensile strength can be obtained by ensuring the property and providing a contact area reduction portion for cutting the oil film on the proximal end side of the seal surface portion.

The first invention is
A female member provided at the end of the first tubular member and formed in a tubular shape that communicates with the inside of the first tubular member.
It is provided at the end of the second tubular member, and is provided with a male member formed in a tubular shape that is connected in a state of being inserted into the insertion hole of the female member and communicates with the inside of the second tubular member.
In the connection structure of the tubular member connecting the first tubular member and the second tubular member via the female member and the male member,
The outer peripheral surface of the male member is composed of a tapered surface whose diameter is reduced toward the tip end side in the insertion direction into the insertion hole.
The inner peripheral surface of the insertion hole of the female member is composed of a tapered surface whose diameter is reduced toward the tip side in the insertion direction into which the male member is inserted.
At least one peripheral surface of the outer peripheral surface of the male member and the inner peripheral surface of the female member is formed of a sealing surface portion continuous in the circumferential direction, and is more than the sealing surface portion on the one peripheral surface. The base end side in the insertion direction is characterized by having a contact area reducing portion that reduces the contact area in contact with the other peripheral surface.

According to this configuration, when the male member is inserted into the insertion hole of the female member, the outer peripheral surface of the male member comes into contact with the inner peripheral surface of the insertion hole of the female member. At this time, since a seal surface portion is formed on the tip side in the insertion direction of at least one peripheral surface of the outer peripheral surface of the male member and the inner peripheral surface of the female member, the seal surface portion betweens the male member and the female member. Sealability is ensured. On the other hand, since the contact area reduction portion is formed on the base end side in the insertion direction with respect to the sealing surface portion of at least one of the outer peripheral surface of the male member and the inner peripheral surface of the female member, the outer peripheral surface of the male member and the female member The contact area with the inner peripheral surface of the is reduced, and the surface pressure is extremely increased. As a result, the oil film between both peripheral surfaces is cut, so that slippage due to the presence of the oil film is suppressed and high tensile strength can be obtained.

Further, since the liquid can be sealed on the tip side in the insertion direction, it is difficult for the liquid to flow between the outer peripheral surface of the male member and the inner peripheral surface of the female member. As a result, the contraction of the outer peripheral surface of the male member and the expansion of the inner peripheral surface of the female member due to the inflow pressure of the liquid are suppressed, so that the contact state between the outer peripheral surface of the male member and the inner peripheral surface of the female member is maintained. High sealing performance is ensured.

The second invention is characterized in that, in the first invention, the contact area reducing portion is a portion that cuts an oil film between the one peripheral surface and the other peripheral surface.

According to this configuration, slippage can be suppressed by cutting the oil film between the peripheral surfaces by the contact area reducing portion.

The third invention is the first or second invention.
The contact area reduction portion is composed of at least one of a step portion formed on one of the peripheral surfaces, a rough surface portion composed of a surface rougher than the seal surface portion, and a surface on which a groove is formed. It is a feature.

According to this configuration, for example, by providing a step portion, the contact area between the outer peripheral surface of the male member and the inner peripheral surface of the female member can be reliably reduced. Further, in the case of a rough surface portion, since the peripheral surface has irregularities, for example, even if an oily liquid exists between the outer peripheral surface of the male member and the inner peripheral surface of the female member. When the convex portion of the rough surface comes into contact with the peripheral surface on the other side, the oil film is at least partially cut. Further, when the surface is formed with a groove, the oil film is similarly cut at least partially. As a result, high tensile strength is ensured, so that even if a high sealing property is ensured by setting the sealing surface portion as a surface close to a mirror surface, the tensile strength does not decrease.

The fourth invention is
In a male member provided at the end of a tubular member and formed in a tubular shape communicating with the inside of the tubular member,
The male member is provided at an end of a tubular member different from the tubular member, and is formed so as to be inserted into an insertion hole of a female member formed in a tubular shape communicating with the inside of the tubular member.
The outer peripheral surface of the portion of the male member to be inserted into the insertion hole is composed of a tapered surface whose diameter is reduced toward the tip end side in the insertion direction into the insertion hole.
The tip side of the outer peripheral surface of the male member in the insertion direction is composed of a sealing surface portion continuous in the circumferential direction, and the proximal end side of the outer peripheral surface in the insertion direction with respect to the seal surface portion is the insertion hole of the female member. It is characterized by having a contact area reducing portion that reduces the contact area in contact with the peripheral surface.

In the fifth aspect of the invention, in the fourth invention, the contact area reducing portion is a stepped portion formed on the outer peripheral surface of the male member, a rough surface portion formed of a surface rougher than the sealing surface portion, and a surface on which a groove is formed. It is characterized in that it is composed of at least one of them.

The sixth invention is
In a female member provided at the end of a tubular member and formed in a tubular shape that communicates with the inside of the tubular member,
The female member is provided with an insertion hole provided at an end of a tubular member different from the tubular member and into which a male member formed in a tubular shape communicating with the inside of the tubular member is inserted.
The inner peripheral surface of the insertion hole is composed of a tapered surface whose diameter is reduced toward the tip side in the insertion direction into which the male member is inserted.
The tip side of the inner peripheral surface of the female member in the insertion direction is composed of a sealing surface portion continuous in the circumferential direction, and the proximal end side of the inner peripheral surface in the insertion direction with respect to the sealing surface portion is the outer peripheral surface of the male member. It is characterized by having a contact area reducing portion for reducing the contact area in contact with the surface.

In the seventh invention, in the sixth invention, the contact area reducing portion is formed with a step portion formed on the inner peripheral surface of the female member, a rough surface portion and a groove formed of a surface rougher than the sealing surface portion. It is characterized in that it is composed of at least one of the faces.

The eighth invention is the third invention.
The rough surface portion is characterized in that it is continuously formed in the circumferential direction of at least one of the outer peripheral surface of the male member and the inner peripheral surface of the female member.

According to this configuration, the tensile strength is sufficiently increased because the rough surface portion is continuous in the circumferential direction.

The ninth invention is the third invention.
The seal surface portion and the rough surface portion are formed on the outer peripheral surface of the male member.
The angle formed by the center line of the male member and the rough surface portion is set to be smaller than the angle formed by the center line of the male member and the seal surface portion.

That is, it is conceivable that minute irregularities will be formed on the rough surface portion that is coarser than the seal surface portion, and when the rough surface portion is formed, the outer diameter of the rough surface portion will be expanded by the height of the convexity. Be done. In the present invention, since the angle formed by the center line and the rough surface portion is smaller than the angle formed by the center line and the seal surface portion, the inclination angle of the rough surface portion with respect to the center line is gentler than that of the seal surface portion. As a result, even if a convex portion is formed on the rough surface portion, the tip of the convex portion can be prevented from protruding significantly in the radial direction from the extension line of the seal surface portion, and as a result, the outer diameter of the rough surface portion can be expanded. It is suppressed.

The tenth invention is the third invention.
The seal surface portion and the rough surface portion are formed on the outer peripheral surface of the male member.
The rough surface portion is characterized in that it is formed so as to be closer to the center line of the male member than the extension line of the seal surface portion.

That is, it is conceivable that minute irregularities will be formed on the rough surface portion that is coarser than the seal surface portion, and when the rough surface portion is formed, the outer diameter of the rough surface portion will be expanded by the height of the convexity. Be done. In the present invention, since the rough surface portion is closer to the center line than the extension line of the seal surface portion, even if a convex portion is formed on the rough surface portion, the tip of the convex portion does not protrude significantly from the extension line of the seal surface portion. As a result, the expansion of the outer diameter of the rough surface portion is suppressed.

According to the first to seventh inventions, the front end side in the insertion direction of at least one of the outer peripheral surface of the male member and the inner peripheral surface of the female member is the seal surface portion, and the base end side in the insertion direction is closer to the seal surface portion. Is used as the contact area reduction portion, so that both high sealing performance and high tensile strength can be achieved by simply inserting the male member into the insertion hole of the female member.

According to the eighth invention, since the rough surface portion is continuous in the circumferential direction of at least one of the outer peripheral surface of the male member and the inner peripheral surface of the female member, the tensile strength can be sufficiently increased.

According to the ninth invention, the inclination angle of the rough surface portion with respect to the center line can be made gentler than that of the seal surface portion. As a result, when forming minute irregularities on the rough surface portion, it is possible to prevent the outer diameter of the rough surface portion from expanding due to the formation of the convexities, and the seal surface portion and the rough surface portion can be surely placed on the peripheral surface on the mating side. Can be contacted with.

According to the tenth invention, since the rough surface portion is closer to the center line than the extension line of the seal surface portion, when forming minute irregularities on the rough surface portion, the outer diameter of the rough surface portion is expanded by the formation of the convexities. It is possible to prevent the seal surface portion and the rough surface portion from being surely brought into contact with the peripheral surface on the other side.

It is a partial cross-sectional view of the indwelling needle which concerns on embodiment of this invention. It is an enlarged side view of a male member. It is a figure corresponding to FIG. 2 which concerns on modification 1. FIG. It is a figure corresponding to FIG. 2 which concerns on modification 2. FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is essentially merely an example and is not intended to limit the present invention, its application or its use.

FIG. 1 is a partial cross-sectional view of the indwelling needle 1 according to the embodiment of the present invention, showing a non-connected state. The indwelling needle 1 includes a male lure member (male member) 10 and an outer needle base 20. The outer needle base 20 has a body member 21 and an outer needle 22. The male member 10 is a member that constitutes a connecting structure of a tubular member together with a body member 21, and is a male member used in the connecting structure of the present invention. Further, the body member 21 is a member that constitutes a connecting structure of a tubular member together with the male lure member 10, and is a female member used in the connecting structure of the present invention.

(Structure of body member)
The body member 21 is provided at the base end portion of the outer needle 22 as the first tubular member, and is formed in a tubular shape communicating with the inside of the outer needle 22. The outer needle 22 is for, for example, being punctured into a blood vessel of a patient to inject a drug solution or the like into the blood vessel, and is made of, for example, a resin material. The tip of the outer needle 22 (the left end in FIG. 1) is the part to be punctured by the patient, and the base end of the outer needle 22 (the right end in FIG. 1) is connected to and fixed to the body member 21. be. A well-known inner needle (not shown) is inserted into the outer needle 22. Further, a well-known check valve (not shown) is provided inside the body member 21.

The body member 21 is made by injection molding a hard resin such as polycarbonate (PC), polypropylene (PP), polyvinyl chloride (PVC), and acrylonitrile butadiene styrene copolymer synthetic resin (ABS). Is an example, and materials other than these can be used. The body member 21 has a cylindrical shape as a whole, and an insertion hole 23 into which the male lure member 10 is inserted is formed inside the body member 21. The insertion hole 23 extends along the center line A of the body member 21. The cross-sectional shape of the insertion hole 23 cut in the radial direction of the center line A is circular over both ends of the insertion hole 23, and the cross-sectional center of the insertion hole 23 is located on the center line A. Further, a connection hole 24 to which the outer needle 22 is connected is formed on the tip end side inside the body member 21.

The male lure member 10 is inserted into the insertion hole 23 from the right side to the left side in FIG. For the tip end side and the base end side of the insertion hole 23, the tip end side (left side in FIG. 1) of the male lure member 10 in the insertion direction is the tip end side of the insertion hole 23 with reference to the insertion direction of the male lure member 10. The insertion direction base end side (right side in FIG. 1) of the member 10 is set as the base end side of the insertion hole 23. The opening 23a on the base end side of the insertion hole 23 is open to the base end surface 21a of the body member 21.

The inner peripheral surface 23b of the insertion hole 23 is composed of a tapered surface whose diameter is reduced toward the tip end side of the insertion hole 23. The inner peripheral surface 23b of the insertion hole 23 has a so-called luer taper, and the angle formed by the center line A and the inner peripheral surface 23b is set in a side view so as to have a gradient of 6%. The gradient of the inner peripheral surface 23b is set to be substantially the same from the base end to the tip end of the inner peripheral surface 23b. The gradient of the inner peripheral surface 23b of the insertion hole 23 is not limited to 6%, and can be set to any gradient. Further, the roughness of the inner peripheral surface 23b of the insertion hole 23 is such that the arithmetic mean roughness Ra is 0.4 or less.

(Structure of male lure member)
The Osuler member 10 can be manufactured by using the same material as the body member 21. The Osuruar member 10 is provided at the tip of the chemical solution tube 100 as the second tubular member, and has a tubular shape communicating with the inside of the chemical solution tube 100. That is, inside the male lure member 10, a communication hole 11 that communicates with the inside of the chemical solution tube 100 is formed. The communication hole 11 extends along the center line B of the male lure member 10, and both ends thereof are open on both end surfaces of the male lure member 10 in the center line B direction. The cross-sectional shape of the communication hole 11 cut in the radial direction of the center line B is circular over both ends of the communication hole 11, and the cross-sectional center of the communication hole 11 is located on the center line B.

Further, regarding the tip end side and the proximal end side of the male lure member 10, the tip end side in the insertion direction (left side in FIG. 1) is the tip end side of the male lure member 10 with reference to the insertion direction of the male lure member 10 into the insertion hole 23. The base end side in the insertion direction (right side in FIG. 1) is the base end side of the male lure member 10. When the male lure member 10 is inserted into the insertion hole 23 of the body member 21, the base end side of the male lure member 10 protrudes from the insertion hole 23, and the center line B of the male lure member 10 and the body member 10 are inserted. The center line A of 21 is substantially the same.

The outer peripheral surface 12 of the portion of the Osuler member 10 to be inserted into the insertion hole 23 is composed of a tapered surface whose diameter is reduced toward the tip end side in the insertion direction into the insertion hole 23. The tip end side of the outer peripheral surface 12 of the Osuruar member 10 is composed of a seal surface portion 12a, and the base end side of the seal surface portion 12a is composed of a rough surface portion 12b. The boundary line L1 between the seal surface portion 12a and the rough surface portion 12b is located at the intermediate portion in the center line B direction of the male lure member 10. In this embodiment, the boundary line L1 is the center line B of the outer peripheral surface 12 of the male lure member 10. It is located closer to the tip than the center of the direction. Therefore, the ratio of the dimension S2 in the center line B direction of the seal surface portion 12a to the dimension S1 of the outer peripheral surface 12 of the outer peripheral surface 12 in the center line B direction is the dimension S3 in the center line B direction of the rough surface portion 12b in the dimension S1. It is smaller than the ratio of.

Both the seal surface portion 12a and the rough surface portion 12b are continuous in the circumferential direction of the male lure member 10. The seal surface portion 12a has a tapered surface having a gradient substantially the same as the gradient of the inner peripheral surface 23b of the insertion hole 23. That is, the angle formed by the seal surface portion 12a with the center line B in the side view is set so as to have a gradient of 6%. Further, the seal surface portion 12a is processed so as to have an extremely smooth surface close to a mirror surface. Specifically, the arithmetic average roughness Ra of the seal surface portion 12a is 0.3 or less. When the arithmetic average roughness Ra of the seal surface portion 12a is a value larger than 0.3, when the outer peripheral surface 12 of the male lure member 10 is inserted into the insertion hole 23 of the body member 21, the seal surface portion 12a and the insertion hole are inserted. Since the contact area of the inner peripheral surface 23b of the 23 becomes smaller and the degree of adhesion decreases, which causes deterioration of the sealing property, it is preferable to set the arithmetic average roughness Ra of the sealing surface portion 12a to 0.3 or less. Since the sealing property can be improved as the sealing surface portion 12a is closer to the mirror surface, it is preferable to set the arithmetic average roughness Ra of the sealing surface portion 12a to a value smaller than 0.3. The lower limit of the roughness Ra is about 0.1.

The dimension S2 of the seal surface portion 12a in the center line B direction can be set to, for example, 2 mm or more and 5 mm or less, preferably 3 mm or more and 4 mm or less. When the dimension S2 is less than 2 mm, the contact area between the sealing surface portion 12a and the inner peripheral surface 23b of the insertion hole 23 becomes small, which causes deterioration of the sealing property. Further, if the dimension S2 exceeds 5 mm, the seal surface portion 12a becomes unnecessarily long, leading to an increase in size of the male lure member 10. Therefore, by setting the dimension S2 in the above range, it is possible to sufficiently secure the sealing property without causing the male lure member 10 to become large.

On the other hand, as shown in FIG. 2, the gradient of the rough surface portion 12b is smaller than the gradient of the sealing surface portion 12a. That is, in the side view, the angle formed by the center line B and the rough surface portion 12b is set to be smaller than the angle formed by the center line B and the sealing surface portion 12a. As a result, the inclination angle of the rough surface portion 12b with respect to the center line B becomes gentler than the inclination angle of the seal surface portion 12a with respect to the center line B. The gradient of the rough surface portion 12b can be set to, for example, 5.8%.

The rough surface portion 12b is formed of a surface rougher than the seal surface portion 12a, and is a contact area reduction portion for cutting an oil film between both peripheral surfaces 12b and 23b by reducing the contact area in contact with the inner peripheral surface 23b of the body member 21. be. The arithmetic average roughness Ra of the rough surface portion 12b is preferably set in the range of 0.5 or more and 0.9 or less, and in this embodiment, the arithmetic average roughness Ra = 0.8. Examples of the method of forming the rough surface portion 12b include a method of performing electric discharge machining and blasting on the outer peripheral surface 12 after molding the resin material, and a method of polishing the outer peripheral surface 12 with a rough member.

Further, the dimension S3 of the rough surface portion 12b in the center line B direction can be set to 4 mm or more and 8 mm or less, preferably 5 mm or more and 7 mm or less.

As shown in FIG. 2, since the gradient of the rough surface portion 12b is smaller than the gradient of the seal surface portion 12a, when the extension line C of the seal surface portion 12a is drawn, the rough surface portion 12b has a center line B rather than the extension line C. Will approach. The rough surface portion 12b, which is coarser than the seal surface portion 12a, has minute irregularities, and even if the outer diameter of the rough surface portion 12b is expanded by the height of the convex when the rough surface portion 12b is formed, the convex portion The tip of the seal surface portion 12a can be prevented from protruding in the radial direction from the extension line C of the sealing surface portion 12a, and as a result, the expansion of the outer diameter of the rough surface portion 12b is suppressed.

Further, since the gradient of the rough surface portion 12b is smaller than the gradient of the seal surface portion 12a, a step portion is formed on the base end side in the insertion direction with respect to the seal surface portion 12a. This step portion is a contact area reducing portion for cutting an oil film between both peripheral surfaces 12b and 23b by reducing the contact area in contact with the inner peripheral surface 23b of the body member 21.

(Action and effect of the embodiment)
By inserting the male lure member 10 into the insertion hole 23 of the body member 21, the outer needle 22 and the chemical solution tube 100 are connected via the male lure member 10 and the body member 21. At this time, since the seal surface portion 12a is formed on the tip side of the outer peripheral surface 12 of the male lure member 10 in the insertion direction, the seal surface portion 12a comes into contact with the inner peripheral surface 23b of the insertion hole 23 of the body member 21. Since the sealing surface portion 12a is a smooth surface close to a mirror surface, the contact area of the insertion hole 23 with the inner peripheral surface 23b is widened, and the sealing surface portion 12a is in close contact with the inner peripheral surface 23b over the entire circumference. The sealing property between the member 10 and the body member 21 is ensured.

Further, since the rough surface portion 12b is formed on the outer peripheral surface 12 of the male lure member 10 and the rough surface portion 12b has irregularities, the outer peripheral surface 12 of the male lure member 10 and the insertion hole 23 of the body member 21 Even if, for example, an oily liquid is present between the inner peripheral surface 23b, the oil film is at least formed by contacting the convex portion of the rough surface portion 12b with the inner peripheral surface 23b of the insertion hole 23 which is the peripheral surface on the other side. It will be partially cut off. By breaking the oil film in this way, when the male lure member 10 is pulled in the pulling direction, it becomes difficult to pull out from the insertion hole 23, and high tensile strength can be obtained. In other words, since the rough surface portion 12b secures high tensile strength, even if the sealing surface portion 12a is set as a surface close to a mirror surface to ensure high sealing performance, the tensile strength does not decrease.

Further, in the present embodiment, since the sealing surface portion 21a is formed on the tip end side, it is possible to seal on the tip end side in the insertion direction. This makes it difficult for the liquid to flow between the outer peripheral surface 12 of the male lure member 10 and the inner peripheral surface 23b of the insertion hole 23 of the body member 21. Therefore, the diameter reduction of the outer peripheral surface 12 of the male lure member 10 and the expansion of the diameter of the inner peripheral surface 23b of the insertion hole 23 of the body member 21 due to the inflow pressure of the liquid are suppressed, so that the outer peripheral surface 12 and the body of the male lure member 10 are suppressed. The contact state of the insertion hole 23 of the member 21 with the inner peripheral surface 23b is maintained, and high sealing performance is ensured.

Further, since the inclination angle of the rough surface portion 12b with respect to the center line B is gentler than that of the seal surface portion 12a, even if a minute convex is formed on the rough surface portion 12b, the tip of the convex portion is the seal surface portion 12a. It can be prevented from protruding in the radial direction from the extension line C. As a result, the expansion of the outer diameter of the rough surface portion 12b can be suppressed, and the insertion of the male lure member 10 into the body member 21 is not difficult.

(Other embodiments)
The shape of the outer peripheral surface 12 of the Osuler member 10 may be the same as that of the first modification shown in FIG. That is, the rough surface portion 12b of the outer peripheral surface 12 of the male lure member 10 is formed so as to be closer to the center line B than the extension line C of the seal surface portion 12a. In this case, a flat surface 12c extending in the center line B direction is formed on the base end side of the boundary line L1. Further, the gradient of the seal surface portion 12a and the gradient of the rough surface portion 12b may be the same, or the roughness of the rough surface portion 12b may be smaller. Also in the case of this modification 1, a step portion is formed on the base end side in the insertion direction with respect to the seal surface portion 12a. This step portion is a contact area reducing portion for cutting an oil film between both peripheral surfaces 12b and 23b by reducing the contact area in contact with the inner peripheral surface 23b of the body member 21.

Further, as in the modified example 2 shown in FIG. 4, the groove 12d may be formed on the outer peripheral surface 12 of the male lure member 10. It is preferable to form a plurality of grooves 12d, and for example, the grooves 12d can be formed in the range of 40 or more and 80 or less. Further, the depth of the groove 12d can be set to, for example, 1 μm or more and 10 μm or less. The groove 12d is preferably formed so as to extend in the direction of the center line B of the male lure member 10, but the groove 12d may be bent or may extend in a spiral strip. Further, the groove 12d may be continuous or intermittent in the center line B direction of the male lure member 10. By forming the groove 12d on the outer peripheral surface 12 of the male lure member 10, the outer peripheral surface 12 of the male lure member 10 and the inner peripheral surface 23b of the insertion hole 23 of the body member 21 are formed in the same manner as when the rough surface portion 12b is formed. Even if, for example, an oily liquid is present between the two, the oil film is at least partially cut off in the connected state. As a result, when the male lure member 10 is pulled in the pulling direction, it becomes difficult to pull out from the insertion hole 23, and high tensile strength can be obtained. Further, a groove similar to the groove 12d can be formed on the inner peripheral surface 23b of the insertion hole 23 of the body member 21.

Further, in the above embodiment, the case where the present invention is applied to the connecting portion of the indwelling needle 1 has been described, but the present invention is not limited to this, and the present invention can be applied when connecting tubular members such as various tubes.

Further, on the outer peripheral surface 12 of the male lure member 10, at least one of the step portion, the seal surface portion and the rough surface portion can be formed on the base end side in the insertion direction with respect to the seal surface portion 12a.

Further, in the above embodiment, the seal surface portion 12a and the rough surface portion 12b are formed on the outer peripheral surface 12 of the male lure member 10, but the present invention is not limited to this, and similarly, the inner peripheral surface 23b of the insertion hole 23 of the body member 21 is similarly formed. , Steps, may be. In this case, the seal surface portion is formed on the tip end side of the inner peripheral surface 23b of the insertion hole 23, and the rough surface portion 12b is formed on the proximal end side of the inner peripheral surface 23b of the insertion hole 23. At least one of the step portion, the seal surface portion, and the rough surface portion may be formed on both the outer peripheral surface 12 of the Osuler member 10 and the inner peripheral surface 23b of the insertion hole 23 of the body member 21. At least one of the step portion, the seal surface portion, and the rough surface portion may be formed only on the inner peripheral surface 23b of the insertion hole 23 of the body member 21.

The above embodiments are merely exemplary in all respects and should not be construed in a limited way. Furthermore, all modifications and modifications that fall within the equivalent scope of the claims are within the scope of the present invention.

As described above, the connection structure of the tubular member according to the present invention can be used for a connection portion of, for example, a medical device.

1 Indwelling needle 10 Osluer member (male member)
12 Outer peripheral surface 12a Seal surface portion 12b Rough surface portion 21 Body member (female member)
23 Insertion hole 23b Inner peripheral surface 22 Outer needle (first tubular member)
100 Chemical solution tube (second tubular member)

Claims (2)

A female member provided at the end of the first tubular member and formed in a tubular shape that communicates with the inside of the first tubular member.
It is provided at the end of the second tubular member, and is provided with a male member formed in a tubular shape that is connected in a state of being inserted into the insertion hole of the female member and communicates with the inside of the second tubular member.
In the connection structure of the tubular member connecting the first tubular member and the second tubular member via the female member and the male member,
The outer peripheral surface of the male member is composed of a tapered surface whose diameter is reduced toward the tip end side in the insertion direction into the insertion hole.
The inner peripheral surface of the insertion hole of the female member is composed of a tapered surface whose diameter is reduced toward the tip side in the insertion direction into which the male member is inserted.
The tip side of the outer peripheral surface of the male member in the insertion direction is composed of a seal surface portion continuous in the circumferential direction, and the proximal end side of the outer peripheral surface of the male member in the insertion direction with respect to the seal surface portion is the insertion hole. It has a contact area reduction part that reduces the contact area that comes into contact with the inner peripheral surface.
The contact area reduction portion is a rough surface portion formed of a surface rougher than the seal surface portion.
A tubular member connection structure characterized in that the angle formed by the center line of the male member and the rough surface portion is set to be smaller than the angle formed by the center line of the male member and the sealing surface portion. In the connection structure of the tubular member according to claim 1,
The contact area reduction portion, the connection structure of a tubular member which is a part to cut the oil film between the outer peripheral surface and the inner peripheral surface of the female member of said male member.

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