JP6599528B2 - Medical connection structure - Google Patents

Description

  The present invention relates to a medical connection structure.

  There are various types of medical connection structures for connecting medical components such as tubes. A medical connection structure of the type disclosed in Patent Document 1 will be described with reference to FIGS. 22 and 23.

The medical connection structure includes a male assembly 1 and a female connector 2.
The male assembly 1 includes a male connector 10 and a threaded tube 20 that is rotatably attached to the male connector 10. The male connector 10 has a male luer portion 11 having a tapered outer periphery. The screwing cylinder 20 has a screwing part 21 positioned on the radially outer side of the male luer part 11 of the male connector 10, and a female screw 21 a is formed on the inner periphery of the screwing part 21.
The female connector 2 has a female luer portion 2a whose inner periphery is tapered, and an engaging projection 2c that is screwed into the female screw 21a is formed on the outer periphery of the distal end portion of the female luer portion 2a. .

  As shown in FIG. 22, when the threaded tube 20 is turned in the tightening direction with the female thread 21a of the threaded tube 20 and the engaging projection 2c of the female connector 2 being threaded, the male luer part 11 and the female The mold luer part 2a is joined. Further, when the screwing cylinder 20 is turned in the tightening direction, the male luer part 11 and the female luer part 2a are strongly joined with a pressing force, and sufficient sealing performance is obtained.

  In the tightened state of the threaded cylinder 20, the inner surface 21 x of the female screw 21 a strongly contacts the engaging protrusion 2 c and attracts the female luer part 2 a toward the male luer part 11. Due to the friction between the inner surface 21x of the female screw 21a and the engaging projection 2c, the threaded tube 20 maintains the attracted state of the female luer part 2a, and consequently the male luer part 11 and the female luer part 2a. The bonding state is maintained.

In the medical connection structure of Patent Document 1, there is a possibility that the male luer part and the female luer part may be joined with an excessive force due to excessive tightening by the screwed tube.
Therefore, the inventor of the present application has developed a medical connection structure provided with a torque limit mechanism as disclosed in Patent Document 2.

  The torque limit mechanism is disposed between the operating cylinder mounted on the outer periphery of the screwing cylinder and the screwing cylinder. The torque limit mechanism transmits a rotational torque in the tightening direction of the operation cylinder to the screwing cylinder, and causes the operation cylinder to idle with respect to the screwing cylinder when the rotation torque exceeds a set torque. As a result, it is possible to inhibit over-tightening by the screw-in cylinder, and consequently to prohibit the male luer part and the female luer part from being joined with an excessive force.

The torque limit mechanism includes an engagement tooth formed on the outer periphery of the threaded cylinder over the entire circumference, an elastic piece formed on an end of the operation cylinder , and an engagement piece formed on the elastic piece and meshing with the engagement tooth. It has a nail. At the end of the operating tube, from the end of the operating tube in the axial direction has a plurality of slits are formed, the elastic piece is arranged between the slits.

Japanese Utility Model Publication No. 59-87840 International Publication WO2016 / 157974

  In the medical connection structure with a torque limit mechanism described in Patent Document 2, the adhesion of dust to the torque limit mechanism cannot be suppressed.

The present invention has been made to solve the above-described problems, and includes a male assembly and a cylindrical female connector, and the male assembly includes a cylindrical male connector and the male connector. The male connector has a male luer part and a support part arranged in order from the distal end to the proximal end, and the screwing cylinder has a distal end. And a mounting portion arranged in order from the base end to the base end. The mounting portion is rotatably mounted on the outer periphery of the support portion of the male connector, and the screwing portion is internally threaded on the inner periphery. And the female connector has a female luer part and an engaging projection formed on the outer periphery of the female luer part, and is screwed on the female luer part. A state in which the female screw of the tube and the engaging protrusion of the female connector are screwed together By rotating in the direction tightening the screwed sleeve, the medical connection structure the male luer part and the female luer part are joined,
Furthermore, an operation cylinder (40) mounted on the outer periphery of the screwing cylinder (20; 20A) and a torque limit mechanism (50; 50C) disposed between the screwing cylinder and the operation cylinder are provided. ,
The torque limit mechanism transmits rotational torque in the tightening direction of the operation cylinder to the screwing cylinder, and when the rotation torque exceeds a set torque, the operation cylinder is idled with respect to the screwing cylinder, The torque limit mechanism includes an engagement tooth (51; 55) formed on the entire inner periphery of the operation cylinder, at least one elastic piece (52; 56) formed on the threaded cylinder, and the elasticity. An engaging claw (53; 57) that is formed in a piece and protrudes radially outward and meshes with the engaging tooth, and the elastic piece is radially inward when the operating cylinder is idle. It is characterized by being deformed.

  According to the above-described configuration, it is possible to prohibit over-tightening by the screw-in cylinder, and as a result, it is possible to prohibit the male luer part and the female luer part from being joined with an excessive force. In addition, the torque limit mechanism can be covered with the operation cylinder, and dust can be prevented from adhering to the torque limit mechanism.

Preferably, the axial end portion of the Nishigoto, slit having a vertical portion extending axially from the end of the Nishigoto are formed, the elastic piece is adjacent to the slit

Preferably, a slit is formed at an end of the threaded tube , and the slit has a vertical portion extending in the axial direction from the end of the threaded tube , and a horizontal portion extending in the circumferential direction from the back end of the vertical portion. And has an L-shape, and the elastic piece is defined in the slit.

  Preferably, an annular gap is formed between the threaded cylinder and the operation cylinder, and the engagement teeth are formed on the inner periphery of the operation cylinder so as to face the annular gap, and The elastic piece is formed and disposed in the annular gap.

Preferably, further, a loosening prevention mechanism that inhibits rotation of the screwed tube relative to the male connector in a joined state of the male luer portion and the female luer portion is the support portion of the male connector. And the mounting portion of the threaded tube,
The loosening prevention mechanism includes ratchet teeth formed over the entire circumference of one of the support portion of the male connector and the mounting portion of the screw-in cylinder, and at least formed on the other of the support portion and the mounting portion. One other elastic piece, and another engagement claw formed on the other elastic piece and meshing with the ratchet teeth, and the elastic coefficient of the elastic piece of the torque limit mechanism is that of the loosening prevention mechanism. It is larger than the other elastic pieces.
According to the above configuration, the male luer portion and the female luer portion and the female luer portion are prohibited from rotating in the loosening direction in the joined state of the male luer portion and the female luer portion. The sealing performance between the mold lures can be maintained, and fluid leakage can be reliably prevented.

  Preferably, the ratchet teeth of the loosening prevention mechanism are formed on the inner periphery of the mounting portion of the screw-in cylinder, and are adjacent to the elastic piece of the torque limit mechanism in the axial direction, so as to prevent the loosening. The other elastic piece of the mechanism is formed on the support portion of the male connector, and the other engagement claw protrudes radially outward and meshes with the ratchet teeth.

  According to the medical connection structure with a torque limit mechanism of the present invention, it is possible to suppress the adhesion of dust to the torque limit mechanism.

It is a perspective view of the male assembly of the medical connection structure which concerns on a 1st reference example. It is a disassembled perspective view of the said male type | mold assembly. It is the perspective view which looked at the said male assembly from the direction different from FIG. It is the disassembled perspective view which looked at the said male type assembly from the direction different from FIG. It is a longitudinal cross-sectional view at the time of applying the said medical connection structure to the connection of tubes, The state before the connection start of the said male assembly and a female connector and the state of a connection completion are shown in order of the arrow. FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. 5 and shows a state in which the engaging claws of the male connector constituting the loosening prevention mechanism and the ratchet teeth of the threaded cylinder are engaged with each other. FIG. 6B is a view corresponding to FIG. 6A showing a state in which the screw tube is rotating in the tightening direction with respect to the male connector. It is a top view of the male assembly of the medical connection structure which makes a 2nd reference example. It is a longitudinal cross-sectional view of the male assembly of the second reference example. It is IX-IX arrow sectional drawing in FIG. It is a perspective view of the male type assembly of the medical connection structure concerning a 1st embodiment of the present invention. It is the perspective view which looked at the male type assembly of the 1st embodiment from a different direction from Drawing 10. It is a disassembled perspective view of the said male assembly of the said 1st Embodiment. It is the disassembled perspective view which looked at the said male assembly of the said 1st Embodiment from the direction different from FIG. It is a longitudinal cross-sectional view of the said male assembly of the said 1st Embodiment. FIG. 15 is a cross-sectional view taken along arrow XV-XV in FIG. 14, showing a state in which torque from the operating cylinder is transmitted to the threaded cylinder and the male connector via the torque limit mechanism in the male assembly. FIG. 15B is a view corresponding to FIG. 15A showing a state where the operating cylinder is idle because the tightening torque of the operating cylinder exceeds the set torque, and torque transmission through the torque limit mechanism cannot be performed. It is a top view of the male type | mold assembly which makes 2nd Embodiment of this invention. It is a longitudinal cross-sectional view of the male assembly of the second embodiment. FIG. 18 is a cross-sectional view taken along arrow XVIII-XVII in FIG. 17, showing a state in which the torque from the operating cylinder is transmitted to the threaded cylinder and the male connector via the torque limit mechanism in the male assembly. FIG. 18B is a view corresponding to FIG. 18A showing a state in which the operating cylinder cannot rotate because the tightening torque of the operating cylinder exceeds the set torque, and the operating cylinder is idle. It is sectional drawing of the male assembly of the medical connection structure which concerns on a 3rd reference example. It is a top view of the three-way stopcock incorporating the male type assembly of the medical connection structure which concerns on a 4th reference example. It is sectional drawing of the said three-way cock. It is sectional drawing which shows the conventional medical connection structure, and shows the state which the connection of a male luer part and a female luer part was completed by clamping of the screwing cylinder. FIG. 23 is a view corresponding to FIG. 22 showing a state in which the screw cylinder is rotated in the loosening direction.

The present invention will be described below with reference to the drawings.
The medical connection structure according to the first reference example shown in FIGS. 1 to 6 has tubes 5 and 5 ′ (first and second medical components; only shown in FIG. 5) through which a liquid such as a drug solution or blood flows. Are connected. This connection structure includes a resin-made male assembly 1 and a resin-made female connector 2 (shown only in FIG. 5).

First, a simple female connector 2 will be described with reference to FIG. The female connector 2 has an elongated cylindrical shape, and has a female luer portion 2a at one axial end portion (tip portion) and a connecting portion 2b at the other end portion (base end portion). The inner periphery of the female luer portion 2a has a gentle taper that increases in diameter toward the tip.
A pair of engaging protrusions 2c having the role of male screws are formed on the outer periphery of the distal end portion of the female luer portion 2a at a distance of 180 ° in the circumferential direction. A protrusion 2d for hooking a finger is formed at an axially intermediate portion of the female connector 2. The end of the tube 5 ′ is inserted and fixed to the connecting portion 2b.

  As shown in FIGS. 1 to 4, the male assembly 1 includes a male connector 10 and a screwed tube 20 attached to the outer periphery of the male connector 10 so as to be rotatable and not movable in the axial direction. Yes.

  The male connector 10 has an elongated cylindrical shape, and has a male luer portion 11 at one axial end portion (tip portion) and a connecting portion 12 at the other end portion (base end portion). The outer periphery of the male luer part 11 has a gentle taper that decreases in diameter toward the tip. The taper angle of the outer periphery of the male luer part 11 is substantially equal to the taper angle of the inner periphery of the female luer part 2a. The end of the tube 5 is inserted and fixed to the connecting portion 12.

  An intermediate portion in the axial direction of the male connector 10 is provided as a support portion 13 for rotatably supporting the screwed tube 20. The support portion 13 includes a small-diameter cylindrical portion 13a, an annular convex portion 13b formed on the outer periphery of the boundary between the small-diameter cylindrical portion 13a and the male luer portion 11, and a boundary between the small-diameter cylindrical portion 13a and the connecting portion 12. And a flange portion 13c formed on the outer periphery.

  The threaded cylinder 20 has a threaded portion 21 at one end (front end) in the axial direction and a mounting portion 22 at the other end (base end). A female screw 21a is formed on the inner periphery of the screwing portion 21, and a protrusion 21b for hooking a finger is formed on the outer periphery.

As shown in FIG. 5, an annular contact surface 22a adjacent to the female screw 21a is formed on the inner periphery of the mounting portion 22 of the threaded cylinder 20, and an annular locking convex portion 22b is formed next to the contact surface 22a. ing.
The contact surface 22a of the screw tube 20 contacts the outer periphery of the annular convex portion 13b of the male connector 10, the locking convex portion 22b is locked to the annular convex portion 13b, and the base end of the mounting portion 22 is the male connector. The threaded cylinder 20 is attached to the male connector 10 so as to be rotatable with respect to the male connector 10 and not relatively movable in the axial direction.

In the mounting state of the screwed tube 20 to the male connector 10, an annular gap 24 is formed between the small diameter tube portion 13 a of the male connector 10 and the mounting portion 22 of the screwed tube 20.
When the screwed cylinder 20 is attached to the male connector 10, an annular insertion space 25 is formed between the screwed part 21 of the screwed cylinder 20 and the male luer part 11 of the male connector 10. . The female screw 21 a is disposed on the radially outer side of the male luer portion 11.

  The male assembly 1 includes a loosening prevention mechanism 30 disposed between the male connector 10 and the screwed tube 20. The loosening prevention mechanism 30 includes a ratchet tooth 31 formed on the entire inner periphery of the mounting portion 22 of the threaded cylinder 20 and a pair of elastic pieces 32 formed on the male connector 10 flange portion 13c. ing. More specifically, the flange portion 13c has an annular support surface 13x that faces the annular gap 24 and extends in the radial direction, and the elastic piece 32 faces the male luer portion 11 from the support surface 13x. Extending in the axial direction.

  As shown in FIGS. 5 and 6A, the pair of elastic pieces 32 are disposed in the annular gap 24 so as to be separated from each other by 180 ° in the circumferential direction. A region corresponding to the elastic piece 32 is chamfered on the outer peripheral surface of the small diameter cylindrical portion 13a, and the elastic piece 32 can be elastically deformed radially inward. An engaging claw 33 is formed on the outer surface of the distal end portion of the elastic piece 32 so as to protrude outward in the radial direction, and meshes with the ratchet teeth 31.

  The tubes 5, 5 'are connected to each other using the medical connection structure having the above-described configuration. As shown in the upper part of FIG. 5, the male luer part 11 of the male assembly 1 and the female luer part 2 a of the female connector 2 are coaxially brought close to each other. Then, the male luer part 11 is inserted into the tip of the female luer part 2a. The insertion is proceeded without resistance until the engaging projection 2c of the female connector 2 hits the female screw 21a of the screwing cylinder 20 of the male assembly 1.

  Next, as shown in FIG. 6B, the screwing cylinder 20 is rotated in the tightening direction indicated by the symbol T. At this time, since the inclined surface 33 a of the engaging claw 33 slides on the inclined surface 31 a of each tooth portion of the ratchet tooth 31, the engaging claw 33 is accompanied by the elastic deformation of the elastic piece 32 and the ratchet tooth of the screwed tube 20. Get over 31 teeth. Since the elastic piece 32 is long and has a small cross-sectional area, the elastic coefficient is small. Therefore, the screwing cylinder 20 can be rotated with respect to the male connector 10 without receiving a large resistance. As a result, the screwing proceeds, and as shown in the lower part of FIG. 5, the insertion depth of the male luer part 11 into the female luer part 2a is increased, and both are joined.

  When the screwing cylinder 20 is further rotated in the tightening direction, the male luer part 11 and the female luer part 2a are brought into close contact with each other, and when the resistance received by the screwing cylinder 20 is increased, the tightening operation of the screwing cylinder 20 is finished. . In this state, as shown in the lower part of FIG. 5, the inner surface 21 x of the female thread 21 a of the screw-in cylinder 20 is in contact with the engagement protrusion 2 c of the female connector 2.

  Even if unintended loosening direction torque is applied to the screwing tube 20, the screwing tube 20 is prevented from rotating in the loosening direction with respect to the female connector 2. This is because the steep surface 31 b of the tooth portion of the ratchet tooth 31 is locked to the steep surface 33 b of the engagement claw 33 as shown in FIG. 6A.

  After the completion of the joining of the male luer part 11 and the female luer part 2a as described above, the screwing tube 20 does not rotate in the loosening direction with respect to the male connector 10, so that as shown in the lower part of FIG. The state where the inner surface 21x of the female thread 21a of the combined cylinder 20 is in contact with the engagement protrusion 2c of the female connector 2 is maintained. As a result, even when the pressure of the fluid flowing in the connection structure is high, the female luer portion 2a and the male luer portion 11 are not displaced in the direction away from each other, and sufficient sealing performance can be maintained, thereby preventing fluid leakage. Can be forbidden.

  In order to release the connection of the tubes 5 and 5 ′, the female connector 2 is rotated in the loosening direction with respect to the male assembly 1. Thereby, while being able to cancel | release the screwing state of the female connector 2 and the screwing cylinder 20, the joining state of the male luer part 11 and the female luer part 2a can be cancelled | released.

  In the first reference example, the loosening prevention mechanism 30 is disposed on the radially inner side of the mounting portion 22 of the screwed cylinder 20 and is not exposed to the outside, so that dust adhesion to the loosening prevention mechanism 30 is minimized. Can be suppressed.

  Other reference examples and embodiments of the present invention will be described below with reference to the drawings. For the configurations corresponding to the reference examples and embodiments described in advance in these reference examples and embodiments, the same or similar numbers are assigned and detailed description thereof is omitted.

  7 to 9 show a male assembly 1A having a medical connection structure according to a second reference example. In this male assembly 1A, the support portion 13A of the male connector 10A, the mounting portion 22A of the screwed tube 20A, and the loosening prevention mechanism 30A are different from the first reference example.

13 A of support parts have the cyclic | annular convex part 13b, the cyclic | annular fitting groove 13d, and the cyclic | annular shoulder part 13e continuous with the connection part 12 in order toward the connection part 12 from the male luer part 11. FIG.
On the inner periphery of the mounting portion 22A, an annular contact surface 22a and an annular locking convex portion 22d are formed in this order from the female screw 21a toward the base end. By fitting the locking projection 22d into the fitting groove 13d, the screwing cylinder 20A is supported by the male connector 10A so as to be rotatable but not movable in the axial direction. The end portion of the mounting portion 22A is disposed on the radially outer side of the shoulder portion 13e of the male connector 10A.

The loosening prevention mechanism 30A has ratchet teeth 35 formed on the entire outer periphery of the annular shoulder portion 13e of the male connector 10A, and an elastic piece 36 formed on the mounting portion 22A of the screwing cylinder 20. Yes. More specifically, an L-shaped slit 37 is formed at the end of the mounting portion 22A. The slit 37 has a vertical portion extending in the axial direction from the end face of the mounting portion 22A, and a horizontal portion extending in the circumferential direction from the back end of the vertical portion. The elastic piece 36 is defined by the slit 37.
The elastic piece 36 extends in the circumferential direction, and an engaging claw 38 is formed on the inner surface of the distal end portion. The engaging claw 38 protrudes inward in the radial direction and meshes with the ratchet teeth 35.

The tooth portion of the ratchet tooth 35 has an inclined surface and a locking surface, and the engaging claw 38 has the inclined surface and the locking surface, as in the first reference example.
In the second reference example, the arrangement of the ratchet teeth 35, the elastic pieces 36, and the engaging claws 38 of the loosening prevention mechanism 30A is opposite to that of the first reference example, but the operation is the same, and thus the description thereof is omitted.

  10 to 15 show a medical connection structure according to the first embodiment of the present invention. In the male assembly 1B having this connection structure, the male connector 10, the screwing tube 20, and the loosening prevention mechanism 30 are substantially the same as those in the first reference example. However, unlike the first reference example, the outer periphery of the threaded portion 21 of the threaded tube 20 is not formed with protrusions and has a cylindrical surface. An annular convex portion 23 is formed on the outer periphery of the distal end portion of the screwing portion 21.

The male assembly 1 </ b> B of the present embodiment further includes an operation cylinder 40 and a torque limit mechanism 50. The operation tube 40 is attached to the outer periphery of the screwing portion 21 of the screwing tube 20. Both ends of the operation tube 40 are locked between the annular convex portion 23 of the screwing tube 20 and the flange portion 13 c of the male connector 10, whereby the operation tube 40 is pivoted with respect to the screwing tube 20. It is supported so that it cannot move.
On the outer periphery of the operation cylinder 40, protrusions 41 for hooking fingers are formed at equal intervals in the circumferential direction.

  The torque limit mechanism 50 is formed between the mounting portion 22 of the screwing cylinder 20 and the proximal end portion of the operation cylinder 40. More specifically, an engagement tooth 51 is formed on the inner periphery of the proximal end portion of the operation cylinder 40 over the entire periphery. The engaging teeth 51 have a shape similar to the ratchet teeth 31 of the loosening prevention mechanism 30.

A pair of L-shaped slits 54 that are 180 degrees apart from each other in the circumferential direction are formed at the end of the mounting portion 22 of the screwed tube 20. The slit 54 has a vertical portion extending in the axial direction from the end surface of the mounting portion 22 and a horizontal portion extending in the circumferential direction from the back end of the vertical portion. A second elastic piece 52 extending in the circumferential direction is defined by the slit 54. Since the second elastic piece 52 has a small circumferential dimension, the elastic coefficient is much larger than the elastic piece 32 of the loosening prevention mechanism 30.
A second engagement claw 53 is formed on the outer surface of the distal end portion of the second elastic piece 52. The second engaging claw 53 protrudes radially outward and meshes with the engaging tooth 51. The ratchet teeth 31 of the loosening prevention mechanism 30 are adjacent to the second elastic piece 52 in the axial direction.

  In the above configuration, when the female connector 2 (see FIG. 5) is brought close to the male assembly 1B and the male luer portion 11 is inserted into the female luer portion 2c, the operation tube 40 is turned in the tightening direction T to operate. The torque of the cylinder 40 is transmitted to the threaded cylinder 20 via the torque limit mechanism 50. Since the elastic coefficient of the second elastic piece 52 of the torque limit mechanism 50 is large, the inclined surface 51a of the engaging portion 51 of the torque limit mechanism 50 and the inclined surface of the second engaging claw 53 are shown in FIG. 15A. The engagement state of the engagement tooth 51 and the second engagement claw 53 is maintained in a state where the contact with the 53a, and the operation cylinder 40 and the screwing cylinder 20 rotate together.

  The operation tube 40 and the screwing tube 20 rotate in the tightening direction T with respect to the male connector 10. This is because the resistance of the loosening prevention mechanism 30 is small. As a result, the screwing of the female screw 21a and the engaging protrusion 2c proceeds, and the male luer part 11 and the female luer part 2a are joined with a pressing force. In this way, the male luer part 11 and the female luer part 2a can be joined with sufficient sealing performance.

  When the operating cylinder 40 is further rotated to exceed the set torque, the inclined surface 53a of the second engaging claw 53 slides on the inclined surface 51a of the tooth portion of the engaging tooth 51 as shown in FIG. With the elastic deformation, the second engaging claw 53 gets over each tooth portion of the engaging tooth 51 of the operating cylinder 40. In this way, the operation cylinder 40 is idle with respect to the screwing cylinder 20, and the rotational torque of the operation cylinder 40 is not transmitted to the screwing cylinder 20. As a result, excessive torque is not applied to the threaded cylinder 20 and it is possible to avoid an excessive pressing force between the male luer part 11 and the female luer part 2a. The mold luer part 2 can be prevented from being damaged, and the male luer part 11 and the female luer part 2a can be prevented from biting so as not to be detached.

  If it is necessary to release the connection after connecting the tubes 5 and 5 ′ as described above, the operation tube 40 is rotated in the loosening direction. Then, the steep engaging surface 51b of the tooth portion of the engaging tooth 51 of the operation tube 40 hits the steep engaging surface 53b of the second engaging claw 53 of the screwing tube 20, and the screwing tube 20 and the male connector are connected. 10 rotates together with the operation cylinder 40 in the loosening direction. As a result, the joined state of the male luer part 11 and the female luer part 2b is released.

  16 to 18 show a male assembly 1C having a medical connection structure according to a second embodiment of the present invention. In the male assembly 1C, the male connector 10A, the screwing tube 20A, and the loosening prevention mechanism 30A are substantially the same as those in the second reference example. However, unlike the second reference example, the outer periphery of the threaded portion 21 of the threaded tube 20A is not formed with a ridge and has a cylindrical surface. An annular convex portion 23 is formed on the outer periphery of the distal end portion of the screwing portion 21.

The male assembly 1C of the present embodiment further includes an operation cylinder 40 and a torque limit mechanism 50C. The operation cylinder 40 is attached to the screwing cylinder 20A so as not to move in the axial direction, and an annular gap 45 is formed between the operation cylinder 40 and the screwing cylinder 20A.
Locking teeth 55 facing the annular gap 45 are formed on the inner periphery of the intermediate portion of the operation tube 40 over the entire periphery. On the other hand, an annular support surface 26 that extends in the radial direction and faces the annular gap 45 is formed in an intermediate portion of the screwing cylinder 20A. The second elastic piece 56 extends in the axial direction from the support surface 26 toward the opposite side of the female screw 21a, and a second engagement claw 57 is formed on the outer surface of the distal end portion of the second elastic piece 56. The second engagement claw 57 protrudes radially outward and meshes with the engagement teeth 55.

  In the torque limit mechanism 50C, the tooth portion of the engaging tooth 55 has the inclined surface 55a and the engaging surface 55b, and the second engaging claw 57 has the inclined surface 57a and the engaging surface 57b. This is the same as the torque limit mechanism 50 in FIG.

  The torque limit mechanism 50C of the male assembly 1C operates in the same manner as the torque limit mechanism 50 of the first embodiment. Briefly, the torque of the operation cylinder 40 is transmitted to the screwing cylinder 20A via the torque limit mechanism 50C, and the operation cylinder 40 and the screwing cylinder 20A rotate in the tightening direction T with respect to the male connector 10A. This is because the resistance of the loosening prevention mechanism 30A is small. As a result, the screwing tube 20A and the female connector 2 (see FIG. 5) are screwed together, and the male luer portion 11 and the female luer portion 2a can be joined with sufficient sealing performance.

When the operating cylinder 40 is further turned to exceed the set torque, the inclined surface 57a of the second engaging claw 57 slides on the inclined surface 55a of each tooth portion of the engaging tooth 55 as shown in FIG. With the elastic deformation of 56, the second engagement claw 57 gets over the tooth portion of the engagement tooth 55 of the operation cylinder 40. As a result, the operation cylinder 40 is idle with respect to the screwing cylinder 20A, and tightening due to excessive torque can be avoided.
When releasing the connection, the operation tube 40 is turned in the loosening direction. Then, the steep engaging surface 55b of the engaging tooth 55 of the operating tube 40 hits the steep engaging surface 57b of the second engaging claw 57 of the screwing tube 20A, and the screwing tube 20A and the male connector 10A are connected to the operating tube. Rotate together with 40 in the direction of loosening.

  In the male assembly 1D of the third reference example shown in FIG. 19, the male connector 10D includes a connector main body 15 and a connection piece 16 that is rotatably connected to the connector main body 15. The connector body 15 has a male luer part 11 and a mounting part 13, and the connecting piece 16 has a connecting part 12. Others are the same as the first reference example. Such a male connector 10D can also be employed in the second reference example and the first and second embodiments.

  In the fourth reference example shown in FIGS. 20 and 21, the present invention is applied to a three-way stopcock 60 (stopcock). The three-way cock 60 includes a body 61 having a cylindrical shape and three flow pipe portions 62, 63, 63 formed integrally with the body 61. The same male assembly 1 as that of the first reference example is attached to the distal end portion of one flow pipe portion 62. The male connector 10 of the male assembly 1 is integrated with the flow pipe portion 62. A female luer 63a and an engaging projection 63b are formed at the tip of the other two flow pipes 63, 63.

A plug member 65 is accommodated in the body 61. The plug member 65 has an L-shaped communication passage 65a, and two of the passages of the flow pipe portions 62, 63, 63 are selectively communicated by a turning operation.
The male assembly of the second reference example and the first and second embodiments may be attached to the three-way cock.

The present invention is not limited to the above-described embodiments, and various aspects are possible. The features of each of the numerous reference examples and embodiments described above can be combined with the features of other embodiments.
The present invention can be applied to a connection structure in any medical component other than tubes and stopcocks.

  The present invention can be applied to connection structures for medical components.

Claims (6)

A male assembly (1B; 1C) and a cylindrical female connector (2);
The male assembly has a cylindrical male connector (10; 10A) and a threaded cylinder (20; 20A) rotatably connected to the male connector,
The male connector has a male luer part (11) and a support part (13; 13A) arranged in order from the distal end to the proximal end,
The threaded cylinder has a threaded part (21) and a mounting part (22; 22A) arranged in order from the distal end to the base end, and the mounting part is provided on the outer periphery of the support part of the male connector. It is rotatably mounted, the threaded portion has a female screw (21a) on the inner periphery and is disposed on the radially outer side of the male luer portion,
The female connector has a female luer part (2a) and an engaging protrusion (2c) formed on the outer periphery of the female luer part.
The male luer part and the female luer part are joined by rotating the screwing cylinder in the tightening direction in a state where the female screw of the screwing cylinder and the engaging projection of the female connector are screwed together. In the medical connection structure
Furthermore, an operation cylinder (40) mounted on the outer periphery of the screwing cylinder (20; 20A) and a torque limit mechanism (50; 50C) disposed between the screwing cylinder and the operation cylinder are provided. ,
The torque limit mechanism transmits rotational torque in the tightening direction of the operation cylinder to the screwing cylinder, and when the rotation torque exceeds a set torque, the operation cylinder is idled with respect to the screwing cylinder,
The torque limit mechanism includes an engagement tooth (51; 55) formed on the inner periphery of the operation cylinder over the entire periphery, at least one elastic piece (52; 56) formed on the threaded cylinder, An engagement claw (53; 57) formed on the elastic piece and projecting radially outward to mesh with the engagement tooth,
A medical connection structure characterized in that a gap is formed between the elastic piece and the outer periphery of the male connector, and the elastic piece is deformed radially inward when the operation cylinder is idle. . The axial end of the Nishigoto are formed slits (54) having a longitudinal portion extending axially from the end of the Nishigoto, that the elastic piece is adjacent to the slit The medical connection structure according to claim 1, characterized in that: A male assembly (1B) and a tubular female connector (2);
The male assembly has a cylindrical male connector (10) and a threaded cylinder (20) rotatably connected to the male connector,
The male connector has a male luer part (11) and a support part (13) arranged in order from the distal end to the proximal end,
The threaded cylinder has a threaded part (21) and a mounting part (22) arranged in order from the distal end to the base end, and the mounting part is rotatable on the outer periphery of the support part of the male connector. The threaded portion has a female screw (21a) on the inner periphery and is disposed on the radially outer side of the male luer portion,
The female connector has a female luer part (2a) and an engaging protrusion (2c) formed on the outer periphery of the female luer part.
The male luer part and the female luer part are joined by rotating the screwing cylinder in the tightening direction in a state where the female screw of the screwing cylinder and the engaging projection of the female connector are screwed together. In the medical connection structure
And an operating cylinder (40) mounted on the outer periphery of the screwing cylinder (20), and a torque limit mechanism (50) disposed between the screwing cylinder and the operating cylinder.
The torque limit mechanism transmits rotational torque in the tightening direction of the operation cylinder to the screwing cylinder, and when the rotation torque exceeds a set torque, the operation cylinder is idled with respect to the screwing cylinder,
The torque limit mechanism is formed on the engagement piece (51) formed on the inner circumference of the operation cylinder over the entire circumference, at least one elastic piece (52) formed on the threaded cylinder, and the elastic piece. And an engaging claw (53) that protrudes radially outward and meshes with the engaging tooth,
The elastic piece is deformed radially inward when the operation cylinder is idle,
A slit (54) is formed at the end of the threaded tube , and the slit has a vertical portion extending in the axial direction from the end of the threaded tube , and a horizontal portion extending in the circumferential direction from the back end of the vertical portion. A medical connection structure, wherein the elastic piece is defined by the slit. A male assembly (1C) and a tubular female connector (2);
The male assembly has a cylindrical male connector (10A) and a threaded cylinder (20A) rotatably connected to the male connector,
The male connector has a male luer part (11) and a support part (13A) arranged in order from the distal end to the proximal end,
The threaded cylinder has a threaded part (21) and a mounting part (22A) arranged in order from the distal end to the base end, and the mounting part is rotatable on the outer periphery of the support part of the male connector. The screwing portion has a female screw (21a) on the inner periphery and is disposed on the radially outer side of the male luer portion,
The female connector has a female luer part (2a) and an engaging protrusion (2c) formed on the outer periphery of the female luer part.
The male luer part and the female luer part are joined by rotating the screwing cylinder in the tightening direction in a state where the female screw of the screwing cylinder and the engagement protrusion of the female connector are screwed together. In the medical connection structure
Furthermore, an operation cylinder (40) mounted on the outer periphery of the screwing cylinder (20A), and a torque limit mechanism (50C) disposed between the screwing cylinder and the operation cylinder,
The torque limit mechanism transmits rotational torque in the tightening direction of the operation cylinder to the screwing cylinder, and when the rotation torque exceeds a set torque, the operation cylinder is idled with respect to the screwing cylinder,
The torque limit mechanism is formed on the engagement piece (55) formed on the inner circumference of the operation cylinder over the entire circumference, at least one elastic piece (56) formed on the threaded cylinder, and the elastic piece. An engaging claw (57) projecting radially outward and meshing with the engaging tooth,
The elastic piece is deformed radially inward when the operating cylinder is idle,
An annular space (45) is formed between the threaded tube and the operation tube, and the engagement teeth are formed on the inner periphery of the operation tube and face the annular space,
Medical connecting structure, characterized in that is the elastic piece formed on the screwed sleeve are arranged in the annular space. A male assembly (1B; 1C) and a cylindrical female connector (2);
The male assembly has a cylindrical male connector (10; 10A) and a threaded cylinder (20; 20A) rotatably connected to the male connector,
The male connector has a male luer part (11) and a support part (13; 13A) arranged in order from the distal end to the proximal end,
The threaded cylinder has a threaded part (21) and a mounting part (22; 22A) arranged in order from the distal end to the base end, and the mounting part is provided on the outer periphery of the support part of the male connector. It is rotatably mounted, the threaded portion has a female screw (21a) on the inner periphery and is disposed on the radially outer side of the male luer portion,
The female connector has a female luer part (2a) and an engaging protrusion (2c) formed on the outer periphery of the female luer part.
The male luer part and the female luer part are joined by rotating the screwing cylinder in the tightening direction in a state where the female screw of the screwing cylinder and the engaging projection of the female connector are screwed together. In the medical connection structure
Furthermore, an operation cylinder (40) mounted on the outer periphery of the screwing cylinder (20; 20A) and a torque limit mechanism (50; 50C) disposed between the screwing cylinder and the operation cylinder are provided. ,
The torque limit mechanism transmits rotational torque in the tightening direction of the operation cylinder to the screwing cylinder, and when the rotation torque exceeds a set torque, the operation cylinder is idled with respect to the screwing cylinder,
The torque limit mechanism includes an engagement tooth (51; 55) formed on the inner periphery of the operation cylinder over the entire periphery, at least one elastic piece (52; 56) formed on the threaded cylinder, An engagement claw (53; 57) formed on the elastic piece and projecting radially outward to mesh with the engagement tooth,
The elastic piece is deformed radially inward when the operation cylinder is idle,
Furthermore, a loosening prevention mechanism (30; 30A) that inhibits rotation of the screwed tube relative to the male connector in the loosened state in the joined state of the male luer part and the female luer part includes the male connector. It is arranged between the support part and the mounting part of the screw cylinder,
The loosening prevention mechanism includes ratchet teeth formed over the entire circumference of one of the support portion of the male connector and the mounting portion of the screw-in cylinder, and at least formed on the other of the support portion and the mounting portion. One other elastic piece (32; 36) and another engagement claw (33; 38) formed on the other elastic piece and meshing with the ratchet teeth,
A medical connection structure, wherein an elastic coefficient of the elastic piece of the torque limit mechanism is larger than that of the other elastic piece of the loosening prevention mechanism. The ratchet teeth of the loosening prevention mechanism are formed on the inner periphery of the mounting portion of the screw-in cylinder, and are adjacent to the elastic piece of the torque limit mechanism in the axial direction.
The said other elastic piece of the said loosening prevention mechanism is formed in the support part of the said male connector, The said other engagement nail | claw protrudes radially outward and is meshing | engaged with the said ratchet teeth. 5. The medical connection structure according to 5.

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