JP6246583B2 - Male connector and medical connector - Google Patents

Description

  The present invention comprises a male connector on which a female connector or a cap connected to a medical bag is detachably mounted, comprising a tube connecting portion on the proximal end side and a cylindrical connection protruding on the distal end side. And a medical connector using the male connector.

  Artificial dialysis for patients with renal failure includes peritoneal dialysis using the peritoneum as a dialysis membrane. A male connector provided at the tip of an exchange tube connected to an abdominal catheter implanted in the abdominal cavity of the peritoneal dialysis patient, and a female connector provided at the proximal end of a bag tube connected to a medical bag containing peritoneal dialysis fluid Connect and inject peritoneal dialysate intraperitoneally. When the peritoneal dialysate is injected into the abdominal cavity, a cap is attached to the male connector from which the female connector has been removed, and the peritoneal dialysate is retained in the abdominal cavity for a predetermined time. The peritoneal dialysis solution staying in the abdominal cavity is dialyzed for waste, excess water, and minerals in blood in the capillaries distributed in the peritoneum. After a predetermined time has elapsed, the peritoneal dialysate in the abdominal cavity is discharged into an empty medical bag, and a new peritoneal dialysate is retained in the abdominal cavity. The patient repeats this operation 3-4 times a day.

  As described above, in the peritoneal dialysis method, the male connector and the female connector or cap connected to the medical bag containing the peritoneal dialysate are frequently attached and detached, and the attachment and detachment is required to be easily performed in a sterile state. ing. Moreover, even when the pressure in the abdominal cavity becomes higher than the external air pressure in the state where the female connector or the cap is attached to the male connector, or even when the pressure of the peritoneal dialysate is increased by pressing the medical bag The intraperitoneal fluid or peritoneal dialysate is required not to leak from the gap between the male connector and the female connector or cap. Furthermore, when bathing, the pressure of the bath water becomes higher than the intraperitoneal pressure, and it is also important to prevent invasion of miscellaneous bacteria-containing fluids such as bath water entering from the gap between the male connector and the cap.

  A medical connector comprising a male connector that meets such requirements and a female connector or cap connected to a medical bag containing peritoneal dialysate is described in Patent Document 1 below. The medical connector described in Patent Document 1 is connected to a male screw of a connecting portion protruding from the distal end side of a male connector whose base end side is the human body side, and a medical bag containing peritoneal dialysis fluid. A medical connector to which a female connector or a female screw of a cap is screwed, wherein a ring-shaped seal member having a circular cross section is provided in a recessed groove provided around a peripheral surface in the vicinity of a base end portion of the connection portion. The seal member is pressed and brought into close contact with the inner wall surface of the female connector or cap screwed into the connecting portion.

JP-A-5-31178

  According to the medical connector described in Patent Document 1, the male connector and the female connector or cap can be attached and detached with the male screw of the connecting portion of the male connector and the female screw of the female connector or cap. Can be easily performed in aseptic conditions. Furthermore, the gap between the connecting portion of the male connector and the female connector or the cap is sealed with a ring-shaped sealing member, so that leakage of liquid in the abdominal cavity and invasion of bacteria-containing fluid such as bath water can be prevented.

  In this medical connector, the male connector and the female connector or the cap are connected by screws. For this reason, in order to sufficiently seal the gap between the two screws with a seal member having a circular cross section, a large protruding portion that protrudes from the opening of the groove of the seal member inserted into the groove of the male connector. It is necessary that the portion is sufficiently adhered to the inner wall surface of the female connector or cap. In order to obtain such a close contact state, it is necessary to sufficiently deform the protruding portion of the seal member by pressing the entire wall surface of the female connector or cap, and when the female connector or cap is attached to or detached from the male connector. In addition, the sliding resistance of the female connector or cap increases, and the rotational torque of the female connector or cap increases.

  However, elderly patients who need peritoneal dialysis to replace intraperitoneal peritoneal dialysate 3 to 4 times a day, and those whose physical strength has declined due to complications, etc., have also lost their finger strength. Therefore, it is desired that such a patient can easily rotate and detach the female connector or the cap from the male connector. On the other hand, in order to easily rotate and remove the female connector or cap from the male connector, the female connector or cap is loosely tightened, and the deformation of the protruding portion of the seal member due to pressing on the inner wall surface of the female connector or cap is reduced. There is a possibility that the gap between them cannot be sufficiently sealed with the seal member.

  The present invention has been made to solve the above-described problems. For example, a female connector or a cap can be easily attached to and detached from a male connector even in a patient whose finger strength has declined, such as an elderly person. Alternatively, it is an object of the present invention to provide a male connector that can sufficiently seal a gap between the cap and a medical connector using the male connector.

The male connector of the present invention made to achieve the above object comprises a tube connecting portion connected to the tube on the proximal end side, and a cylindrical connecting portion protruding from the tube connecting portion to the distal end side, A female connector or a male connector connected to a medical bag is detachably attached to the connecting portion, and the connecting portion includes a concave groove provided on an outer peripheral surface, a tip side wall surface of the concave groove, and A ring-shaped seal member made of an elastic material inserted in close contact with the radially outer end of the proximal side wall surface , and the seal member protrudes radially outward from the concave groove on the distal end side A side extension portion and a base end side extension portion projecting radially outward from the concave groove on the base end side; the base end side extension portion is inclined in the base end direction; and the base end The outer peripheral surface of the side extension portion is a curved surface that protrudes radially outward, and the connection portion When the connector or the cap is mounted, the inner wall surface of the female connector or the cap, the radially outer end of each extending portion in which close contact is pressed.

  It is preferable that the concave groove of the male connector is provided on the outer peripheral surface on the proximal end side of the connecting portion. As a result, the seal member inserted in the concave groove is positioned on the base end side of the connecting portion, and the outer surface of the connecting portion to which the female connector or the cap is attached can be sealed from the outside. It is possible to prevent germs from entering between the inner peripheral surface of the female connector or the cap and breeding.

  It is preferable that the seal member of the male connector is in close contact with the radial outer end of each wall surface of the concave groove. Accordingly, since the seal member is in close contact with the outer end (opening edge) in the radial direction of the wall surface of the groove, it is possible to prevent germs from entering and breeding between the seal member and the groove.

  In the sealing member, it is preferable that the base end side extending portion protrudes to the base end side from the concave groove. Thereby, a sealing member can be closely_contact | adhered reliably to the radial direction outer end (opening edge) of the base end side wall surface of a ditch | groove.

  It is preferable that the sealing member of the male connector is in close contact with the entire wall surface and bottom surface of the concave groove. Thereby, it is possible to reliably prevent leakage of internal liquid and entry of external liquid from the gap between the seal member and the inner wall surface of the groove.

  It is preferable that the outer peripheral surface of the distal end side extending portion of the seal member is a curved surface that protrudes radially outward. Thereby, when attaching and detaching a female connector or a cap to a male connector, sliding resistance of a female connector or a cap can be reduced.

  It is preferable that the said front end side extension part of a male connector inclines in the front end direction. Thereby, it can seal reliably with respect to the internal pressure applied to a sealing member.

  It is preferable that the front end side extending portion of the seal member protrudes to the front end side from the concave groove. Thereby, a sealing member can be closely_contact | adhered reliably to the radial direction outer end (opening edge) of the front end side wall surface of a ditch | groove.

  It is preferable that the seal member is a curved surface in which a distal end side surface of the distal end side extending portion is convex in the proximal direction. Thereby, since the front end side extension part is easily deformed radially inward, the sliding resistance can be further reduced.

  It is preferable that the female connector or the cap is screwed to the connecting portion of the male connector. Accordingly, the female connector or the cap can be easily attached to and detached from the connecting portion of the female connector.

  The medical connector of the present invention includes any one of the male connectors described above, a tube connected to the tube connector of the male connector, and the female connector or the cap detachably attached to the connector. It comprises.

  The medical connector may be a peritoneal dialysis connector.

  According to the male connector of the present invention, when an external pressure is applied to the seal member, the proximal end side extension portion of the seal member is deformed so as to be in closer contact with the inner wall surface of the female connector or the cap. For this reason, it is possible to reduce the sliding resistance when attaching / detaching the female connector or the cap by reducing the deformation of the seal member due to the pressing on the inner wall surface of the female connector or the cap, The gap can be sufficiently sealed.

It is the fragmentary sectional front view and partial enlarged sectional view which attached the cap to the male connector to which this invention is applied. It is a fragmentary sectional view of the seal member of the male connector to which the present invention is applied. It is a partial cross section front view of the connection part of the male connector to which this invention is applied. It is a fragmentary sectional front view of the cap attached to the male connector to which the present invention is applied. It is a fragmentary sectional view which shows the other aspect of the sealing member of the male connector to which this invention is applied. It is the fragmentary sectional front view which shows the state just before the connection of the male connector and female connector to which this invention is applied, and the connected state. It is a perspective view which shows the other aspect which attached the cap to the male connector to which this invention is applied. It is a perspective view which shows an example which used the medical connector to which this invention is applied for treatment. It is a fragmentary sectional front view which shows the other aspect of the connection of the male connector and cap which apply this invention.

  Hereinafter, although the form of this invention is demonstrated in detail, the scope of the present invention is not limited to these forms.

  A peritoneal dialysis system using the medical connector according to the present invention for the treatment of renal failure is shown in FIG. In the peritoneal dialysis system shown in FIG. 8, the male connector 20 constituting the medical connector 10 is attached to the distal end portion of the exchange tube 50. The proximal end of the exchange tube 50 is connected to a catheter (not shown) implanted in the patient's abdominal cavity. Further, a clamp 52 is attached in the middle of the exchange tube 50. A female connector 40 is attached to a proximal end portion of a bag tube 62 having a distal end portion connected to a medical bag 60 containing peritoneal dialysate. When the peritoneal dialysate is injected or discharged into the abdominal cavity of the patient, the female connector 40 is connected to the male connector 20. The cap 30 is attached to the male connector 20 in which the female connector 40 is not connected. The male connector 20, the female connector 40, and the cap 30 are made of synthetic resin such as polycarbonate, polyvinyl chloride, and polypropylene, but may be made of metal or ceramic.

  A state in which the cap 30 is attached to the male connector 20 constituting the medical connector 10 is shown in FIG. The male connector 20 includes a tube connection portion 21 that is connected to the replacement tube 50 on the proximal end side, and a cylindrical connection portion 24 that protrudes from the tube connection portion 21 to the distal end side and to which a cap 30 is screwed. . The tube connection portion 21 includes an insertion connection portion 21b that is inserted and connected to the distal end portion of the exchange tube 50, a cylindrical tube cover 22 that covers the outer peripheral surface of the insertion connection portion 21b, and a flange 21a. . The tube cover 22 is formed with an insertion hole 22b and a grip portion 22a that is gripped by hand so that the distal end portion of the replacement tube 50 can be inserted into the insertion connection portion 21b. The connecting portion 24 has a concave groove 26 provided around the outer peripheral surface of the connecting portion 24 covered by the inner wall surface of the screwed cap 30, and a ring-shaped seal member 28 inserted into the concave groove 26. doing. The connecting portion 24 and the tube connecting portion 21 pass through the flow path 23 through which the liquid passes along the central axis.

The seal member 28 is made of an elastic material, and has a wall surface 26a (hereinafter referred to as a distal end side wall surface 26a) on the distal end side of the connecting portion 24 of the concave groove 26 and a wall surface 26b (hereinafter referred to as a base end side) of the connecting portion 24. (Referred to as an end side wall surface 26b). As shown in FIG. 1, the seal member 28 and both wall surfaces of the groove 26 are in close contact with each other in the vicinity of the opening edge including the opening edge that is the periphery of the groove 26. The seal member 28 includes a distal end side extending portion 28a projecting radially outward from the groove 26 on the distal sidewall surface 26a side, and a proximal end projecting radially outward from the recess groove 26 on the proximal sidewall surface 26b side. A side extension 28b is formed. Further, the base end side extending portion 28b is inclined in the base end direction, and the outer peripheral surface of the end portion on the radially outer side is formed in a curved surface that protrudes radially outward. The distal end portions of the distal end side extending portion 28 a and the proximal end side extending portion 28 b are pressed against and closely adhered to the inner wall surface of the cap 30 screwed to the connecting portion 24. Thus, as shown in the partial enlarged sectional view of FIG. 1, the base end side extended portion 28b of the seal member 28 closes the gap between the inner wall surface of the seal member 28 and the cap 30 in response to external pressure P _o It deforms as follows. For this reason, the deformation | transformation of the sealing member 28 by the press in the inner wall surface of the cap 30 is made small, and the clearance gap between the connection part 24 of the male connector 20 and the cap 30 is reduced, reducing the sliding resistance at the time of attaching / detaching the cap 30. It can seal well.

In the embodiment shown in FIG. 1, the seal member 28 is in close contact with the opening edge that is the peripheral edge of the concave groove 26, that is, the radial outer ends of the distal end side wall surface 26 a and the proximal end side wall surface 26 b. Thereby, it is possible to prevent germs from entering between the seal member 28 and the concave groove 26 and breeding. A part of the wall surface in the vicinity of the bottom surface of the concave groove 26 (a surface facing the opening of the concave groove 26) and the seal member 28 may be in a non-contact state. Further, in this embodiment, the base end side extending portion 28 b protrudes further to the base end side than the concave groove 26. Accordingly, the seal member 28 is securely adhered to the radially outer end (opening edge) of the proximal end side wall surface 26b of the concave groove 26, so that germs enter and propagate between the seal member 28 and the concave groove 26. Can be prevented more reliably. In this embodiment, the distal end side extending portion 28a is inclined in the distal direction, and the outer peripheral surface of the radially outer end portion is formed into a curved surface that protrudes radially outward. Thus, when attaching and detaching the cap 30 to the male connector 20, it can reduce the sliding resistance of the cap 30, and the inner wall surface of the seal member 28 and the cap 30 and the distal end side extending portion 28a in response to the internal pressure P _i Therefore, the liquid can be prevented from leaking from the gap between the seal member 28 and the inner wall surface of the cap 30. Further, in this embodiment, the distal end side extending portion 28 a is inclined in the distal direction with respect to the concave groove 26. This ensures that the seal member 28 is in close contact with the radially outer end (opening edge) of the distal end side wall surface 26a of the concave groove 26, and that germs enter and propagate between the seal member 28 and the concave groove 26. It can be prevented more reliably.

  In this embodiment, of the portion of the seal member 28 that protrudes radially outward from the concave groove 26, the portion that is pressed against and closely adhered to the inner wall surface of the cap 30 is the tip-side extension portion 28a and the base. It is an end portion on the radially outer side of the end side extending portion 28b. Thus, even if the radially outer ends of the distal end side extending portion 28a and the proximal end side extending portion 28b are pressed against and closely contacted with the inner wall surface of the cap 30, the distal end side extending portion 28a and the proximal end The outer peripheral surface between the side extending portions 28b is recessed inwardly in the radial direction as shown in the partially enlarged sectional view of FIG. 1, and is in a non-contact state with the inner wall surface of the cap 30. Therefore, the sliding resistance of the cap 30 screwed into the male connector 20 shown in FIG. 1 is such that a seal member having a circular cross section is inserted into the concave groove 26 and almost the entire portion protruding from the opening of the concave groove 26 is capped. Compared with the case where the inner wall surface is pressed and adhered, it can be substantially halved. The attachment and detachment of the cap 30 to and from the male connector 20 to which such a seal member 28 is attached can be easily performed even by an elderly person whose finger strength has declined.

  As shown in FIG. 2, the seal member 28 in this embodiment has flat surfaces 28 c and 28 c that are in close contact with the distal end side wall surface 26 a and the proximal end side wall surface 26 b of the groove 26, and the bottom surface side of the groove 26. This portion, that is, the inner peripheral surface is formed in a radially convex shape, specifically, a curved surface 28d. Thereby, it becomes easy to insert the seal member 28 into the concave groove 26. The thickness of the seal member 28 (between the flat surfaces 28c and 28c) is preferably wider than the opening width of the recessed groove 26 to be inserted. Thereby, the sealing member 28 inserted into the concave groove 26 is in close contact with the distal end side wall surface 26a and the proximal end side wall surface 26b. Further, the distal end side extended portion 28a and the proximal end side extended portion 28b formed on the seal member 28 protrude radially outward from the flat surfaces 28c and 28c, and the outer peripheral surface of the radially outer end portion is radial. It is formed in a curved surface convex outward. A space between the distal end side extending portion 28a and the proximal end side extending portion 28b is formed to be recessed in a radially inward direction. Since each dimension of the front end side extension part 28a and the base end side extension part 28b is substantially equal, the dimension of the base end side extension part 28b is demonstrated. The length (L) of the base end side extending portion 28b is the length of the portion where the base end side extending portion 28b protrudes radially outward from the flat surface 28c, and is the length between the flat surface 28c and the base end side. A perpendicular line that passes through the boundary with the extending part 28b and is orthogonal to the flat surface 28c, and a tangent line that is parallel to this perpendicular line and that is in contact with the radially outer end (outer peripheral surface) of the proximal-side extending part 28b. Is the distance between. The length (L) is preferably 0.5 to 1 mm. Further, the extending width (W) of the base end side extending portion 28b is a width in which the base end side extending portion 28b protrudes to the base end side from the flat surface 28c, and is parallel to the flat surface 28c. This is the distance between the tangent line in contact with the base end of the base end side extending portion 28b and the extension line extending from the flat surface 28c. The extension width (W) is preferably about 0.2 to 0.8 mm. Further, the inclination (θ) of the base end side extending portion 28b is an angle between the center line of the base end side extending portion 28b and the flat surface 28c. The inclination (θ) is preferably about 30 to 60 °. As the elastic material forming the seal member 28, silicone rubber, particularly polydimethylsiloxane can be suitably used. The outer peripheral surface of each radially outer end of the distal end side extending portion 28a and the proximal end side extending portion 28b of the seal member 28 shown in FIGS. 1 and 2 is formed into a curved surface that protrudes radially outward. However, the peripheral surface of the distal end portion of the distal end side extending portion 28a may not be formed in a curved surface.

  As shown in FIG. 3, the connecting portion 24 in this embodiment is formed so as to protrude from the tube connecting portion 21 to the distal end side, and a concave groove 26 is provided on the proximal end side of the outer peripheral surface thereof. As a result, the seal member 28 inserted into the concave groove 26 is positioned on the base end side of the connecting portion, and the substantially entire outer peripheral surface of the connecting portion 24 to which the cap 30 is screwed can be sealed from the outside. It is possible to prevent germs from invading and breeding between the outer peripheral surface of the cap and the inner peripheral surface of the cap 30. Further, the connecting portion 24 is provided with a screwed portion 25 that protrudes from the portion where the concave groove 26 is formed to the front end side and includes a male screw 25a on the outer peripheral surface. That is, the concave groove 26 is formed on the outer peripheral surface of the connecting portion 24 on the base end side with respect to the screwed portion 25 to which the female screw 30a of the cap described later is screwed. As a result, since the screwed portion 25 of the connecting portion 24 to which the cap 30 is screwed can be sealed from the outside, various germs invade between the screw threads of the male screw 25a of the screwed portion 25 that is difficult to disinfect with alcohol cotton or the like to propagate. Can be prevented. Further, the connecting portion 24 includes an annular cover portion 24c protruding from the screwed portion 25 toward the tip side, an annular cover portion 24c and an annular protrusion 24d provided inside the screwed portion 25, an annular cover portion 24c, and a screw. There is a circumferential groove 24e provided between the landing portion 25 and the annular projection 24d. The annular protrusion 24d is formed so that the distal end surface thereof is located closer to the proximal end than the distal end of the annular cover 24c.

  As shown in FIG. 3, the tube connection portion 21 in this embodiment includes an insertion connection portion 21 b inserted and connected to the distal end portion of the exchange tube 50 (FIG. 1), and the distal end side of the tube connection portion 21, that is, a connection. The flange 21a formed in the part 24 side and the cylindrical tube cover 22 which covers the outer peripheral surface of the insertion connection part 21b are provided. The tube cover 22 is provided with an insertion hole 22b formed so that the distal end portion of the exchange tube 50 (FIG. 1) can be inserted into the insertion connection portion 21b, and a grip portion 22a that is gripped by hand. The tube connecting portion 21 and the connecting portion 24 pass through a flow path 23 through which liquid passes along the central axis. The tube cover 22 and the flange 21a may be omitted.

  FIG. 4 shows the cap 30 screwed to the screwing portion 25 of the connecting portion 24 shown in FIG. On the inner wall surface of the cap 30, a female screw 30a to be screwed to the male screw 25a of the screwing portion 25 is formed, and a circumferential groove 30b into which the annular cover portion 24c of the connecting portion 24 is inserted and an annular protruding portion 24d. An annular partition wall 30d is formed between the insertion portion 30c and the insertion portion 30c. A concave portion 30e is connected to the distal end side of the insertion portion 30c. As shown in FIG. 1, when the cap 30 is screwed onto the screw portion 25 of the connecting portion 24, the recess 30e seals the gap between the tip end surface of the annular protrusion 24d inserted into the insert portion 30c. An O-ring 32 as a seal member is inserted. Further, a porous body impregnated with a disinfectant, such as a sponge 34, is inserted into the bottom (tip) of the circumferential groove 30b of the cap 30. With this disinfectant, when the cap 30 is screwed onto the connecting portion 24 as shown in FIG. 1, each wall surface of the circumferential groove 24e, the tip and outer peripheral surfaces of the annular cover portion 24c, and the outer peripheral surface of the screwing portion 25 are disinfected. it can. As the disinfectant, for example, isodine (registered trademark) can be preferably used.

  The seal member 28 inserted into the concave groove 26 of the connecting portion 24 shown in FIG. 1 is in a non-contact state with a part of the bottom surface of the concave groove 26, but as shown in FIG. 28 may be in close contact with the entire wall surface of the groove 26. Thereby, it is possible to more reliably prevent germs from invading between the seal member 28 and the concave groove 26 and breeding. In order to make the seal member 28 adhere to the entire wall surface of the groove 26 in this manner, it is preferable that the portion of the seal member 28 inserted into the groove 26 has a square cross section following the groove 26.

  1A and 5A, the distal end side extending portion 28a of the seal member 28 is inclined toward the distal end side and protrudes further toward the distal end side than the concave groove 26, but as shown in FIG. 5B. Moreover, the distal end side extending portion 28a may be formed as a protruding portion 28e that protrudes substantially parallel to the radial direction and whose outer peripheral surface is a curved surface that protrudes radially outward. Thereby, the sliding resistance at the time of attaching and detaching the cap 30 to the connecting portion 24 can be further reduced. Further, as shown in FIG. 5C, the convex portion 28e is preferably formed with a curved surface convex in the proximal direction on the surface on the distal end side. Thereby, the contact | adherence area of the edge part of the radial direction outer side of the convex part 28e and the inner wall face of the cap 30 can be narrowed, and it can achieve a still lower sliding than the sealing member 28 shown in FIG.5 (b). Further, as shown in FIG. 5D, the distal end side extending portion 28a inclined toward the distal end side is positioned on the distal end side with respect to the distal end side wall surface 26a of the concave groove 26, and the proximal end side extension inclined toward the proximal end side is provided. The protruding portion 28b may be positioned on the distal end side of the proximal end side wall surface 26b of the concave groove 26. In addition, the sealing member 28 may combine each embodiment shown in FIG. 1 and FIG. 5 (a)-(d) suitably.

  Although FIGS. 1-5 has demonstrated the state which attached the cap 30 to the male connector 20, the state just before connecting the female connector 40 connected with the medical bag to the male connector 20 and the connected state are shown in FIG. . 6A shows a state immediately before the male connector 20 and the female connector 40 are connected, and FIG. 6B shows a state where the male connector 20 and the female connector 40 are connected. At the base end portion of the female connector 40 shown in FIG. 6, a circumferential groove-like tube connecting portion 42 into which the base end portion of the bag tube 62 connected to the medical bag 60 (see FIG. 8) is inserted. Is installed around. The configuration of the base end portion of the female connector 40 connected to the male connector 20 is substantially the same as that of the cap 30. Specifically, a female screw 42 a that is screwed to the male screw 25 a of the screwed portion 25 of the male connector 20 extends from a flange 44 that is provided on the outer periphery of the middle portion of the female connector 40. It is formed on the inner wall surface. In addition, an annular partition 40d is formed between the circumferential groove 40b in which the annular cover portion 24c of the connecting portion 24 is inserted and the insertion portion 40c in which the annular protrusion 24d is inserted. A recess 40e is connected to the distal end side of the insertion portion 40c. When the female connector 40 is screwed to the screwing portion 25 of the connecting portion 24, the concave portion 40e serves as a seal member that seals a gap between the tip end surface of the annular protrusion 24d inserted into the insertion portion 40c. An O-ring 48 is inserted. A channel 43 that penetrates the female connector 40 is opened at the bottom surface (tip portion) of the recess 40e. The flow path 43 communicates the flow path 23 that penetrates the male connector 20 and the base end portion of the bag tube 62.

  Since the ring-shaped seal member 28 inserted into the concave groove 26 of the male connector 20 shown in FIG. 6 is the same as the case where the male connector 20 and the cap 30 are connected to each other, the description thereof is omitted.

  A peritoneal dialysis method using the medical connector 10 between the male connector 20 and the female connector 40 or the cap 30 shown in FIGS. 1 to 6 will be described. When injecting the peritoneal dialysate into the abdominal cavity of a patient, as shown in FIG. 8, a female attached to the base end of a bag tube 62 connected to the medical bag 60 containing the peritoneal dialysate. The connector 40 is connected to the male connector 20 attached to the distal end portion of the exchange tube 50 connected to the catheter in the abdominal cavity of the patient. Next, the clamp 52 attached in the middle of the exchange tube 50 is loosened, and the peritoneal dialysate in the medical bag 60 is injected into the abdominal cavity of the patient. After the peritoneal dialysate is injected, the clamp 52 is closed, the female connector 40 is removed from the male connector 20, and the cap 30 is attached to the male connector 20. The cap 30 is attached to the male connector 20, and the peritoneal dialysate is retained in the abdominal cavity for a predetermined time, and the waste products, excess water, and minerals in the blood vessels in the capillaries distributed in the peritoneum are dialyzed against the peritoneal dialysate. To do. Meanwhile, the patient can have a normal life and can take a bath. After the predetermined time has elapsed, the patient removes the cap 30, connects the female connector 40 and the male connector 20 connected to the empty medical bag, and discharges the peritoneal dialysis solution in the abdominal cavity to the empty medical bag. Thereafter, the patient similarly infuses and retains a new peritoneal dialysis solution in the abdominal cavity.

  For a patient with weak force such as an elderly person who repeatedly injects and discharges the peritoneal dialysis solution into the abdominal cavity 3 to 4 times a day, for example, the male connector 20 and the female shown in FIGS. According to the connector 40 or the cap 30, the gap between the connecting portion 24 of the male connector 20 and the female connector 40 or the cap 30 can be easily attached and detached while being sufficiently sealed. That is, when the female connector 40 or the cap 30 is connected to or attached to the male connector 20, the proximal end of the seal member 28 inserted into the concave groove 26 in the male connector 20 as shown in FIGS. The portion 28b is deformed so as to be more closely attached to the inner wall surface of the female connector or the cap according to the external pressure. For this reason, the connecting portion of the male connector 20 is reduced while reducing the sliding resistance when the female connector 40 or the cap 30 is attached / detached by reducing the deformation of the seal member 28 due to the pressing on the inner wall surface of the female connector 40 or the cap 30. The gap between the connector 24 and the female connector 40 or the cap 30 can be sufficiently sealed.

  1 to 6, when the cap 30 or the female connector 40 is rotated and screwed to the male connector 20, the sliding resistance of the cap 30 or the female connector 40 is small. Since it is difficult for a patient with a weak force such as the end of screwing to be finished, the cap 30 or the female connector 40 may be tightened incompletely. Therefore, the male screw 25a formed on the screwed portion 25 of the male connector 20 and the female screw 30a, 42a formed on the inner wall surface of the cylindrical portion 46 of the cap 30 or the female connector 40 are both screwed. It is preferable to provide a click mechanism informing that the tightening force has increased rapidly. As this click mechanism, for example, as shown in FIG. 7, a protrusion 27 provided at each end of a male screw 25a formed on the connecting portion 24 of the male connector 20 and a female screw 30a formed on the inner wall surface of the cap 30, No. 33 can be mentioned. According to this click mechanism, when the protrusion 33 of the cap 30 abuts on the protrusion 27 of the male connector 20, the tightening force of the cap 30 increases rapidly, and a click feeling of “cata” occurs. The patient who rotates the cap 30 can be informed that the screwing of the cap 30 has been completed. By this click mechanism, unexpected loosening between the connected male connector 20 and the female connector 40 or the cap 30 can be prevented. In addition to the protrusions 27 and 33, the click mechanism may be a protrusion and a recess.

  In FIG. 1 to FIG. 7 described above, the cap 30 or the female connector 40 is screwed to the male connector 20. However, it is only necessary that both can be detachably connected regardless of screwing. As such a connecting method, as shown in FIG. 9, the distal end of the engaging portion 29 connected to the radially outer end of the hinge portion 29a extending radially outward from the flange 21a of the tube connecting portion 21. And the connection by the flange 31 at the base end portion of the cap 30. In this case, when the operation part 29c provided on the base end side of the locking part 29 is picked with a finger, the hinge part 29a is bent to the base end side, the claw 29b is separated from the flange 31 of the cap 30, and the cap 30 is male. The connector 20 comes off. Similarly, the male connector 20 and the female connector 40 can be connected by providing a flange at the base end of the female connector. In FIG. 9, the locking portion 29 with the claw 29 b is provided on the male connector 20, but the locking portion 29 with the claw 29 b may be provided on the female connector 40 or the cap 30. Further, the male connector 20 and the cap 30 or the female connector 40 are not screwed together, and the guide groove provided on the outer peripheral surface of the connecting portion 24 of the male connector 20 and the guide protrusion provided on the inner peripheral surface of the female connector 40 are not involved. You may go with.

  The medical connector according to the present invention can be used not only for peritoneal dialysis but also for transfusion or for infusion of a nutrient solution into the body.

10: medical connector, 20: male connector, 21, 42: tube connecting part, 21a, 31, 44: flange, 21b: insertion connecting part, 22: tube cover, 22a: gripping part, 22b: insertion hole, 23 , 43: flow path, 24: connecting part, 24c: annular cover part, 24d: annular projection part, 24e, 40b: circumferential groove, 25: screwing part, 25a: male screw, 26: concave groove, 26a: tip side Wall surface, 26b: proximal end side wall surface, 27, 33: protrusion, 28: seal member, 28a: distal end side extending portion, 28b: proximal end side extending portion, 28c: flat surface, 28d: curved surface, 28e: convex portion , 29: Locking part, 29a: Hinge part, 29b: Claw, 29c: Operation part, 30: Cap, 30a, 42a: Female screw, 30b: Circumferential groove, 30c, 40c: Insertion part, 30d, 40d: Annular partition , 30e, 40e: recess, 32, 48: O-ring, 34: sponge, 40: female connector, 46: cylindrical part, 50: replacement tube, 52: clamp, 60: medical bag, 62: bag tube, P _i : Internal pressure, _Po : external pressure, L: length, W: extension width, θ: slope

Claims (11)

A tube connecting portion connected to the tube on the proximal end side and a cylindrical connecting portion protruding from the tube connecting portion to the distal end side, and a female connector or cap connected to a medical bag can be attached to and detached from the connecting portion A male connector to be attached,
The connecting portion is a ring-shaped seal member made of a concave groove provided on the outer peripheral surface and an elastic material inserted in close contact with the radial outer ends of the distal end side wall surface and the proximal end side wall surface of the concave groove. And
The seal member has a distal end side extending portion projecting radially outward from the concave groove on the distal end side, and a proximal end extending portion projecting radially outward from the concave groove on the proximal end side,
The base end side extending portion is inclined in the base end direction, and an outer peripheral surface of the base end side extending portion is a curved surface protruding radially outwardly,
When the female connector or the cap is attached to the connecting portion, the radially outer end of each of the extending portions is pressed into close contact with the inner wall surface of the female connector or the cap. Male connector.   The male connector according to claim 1, wherein the concave groove is provided around an outer peripheral surface of the base end side of the connecting portion. 2. The male connector according to claim 1 , wherein the base end side extending portion protrudes to the base end side from the concave groove. It said sealing member, a male connector according to any one of claims 1 to 3, characterized in that in close contact with the entire surface of the respective wall surfaces and a bottom surface of the groove. Male connector according to any one of claims 1 to 4, wherein the outer peripheral surface of the distal-side extending portion is a convex curved surface radially outward. The male connector according to claim 5 , wherein the distal end side extending portion is inclined in the distal direction. The male connector according to claim 6 , wherein the distal end side extending portion protrudes further toward the distal end side than the concave groove. The male connector according to claim 5 , wherein a surface on a distal end side of the distal end side extending portion is a curved surface protruding in a proximal direction. The male connector according to any one of claims 1 to 8 , wherein the female connector or the cap is screwed into the connecting portion of the male connector. The male connector according to any one of claims 1 to 9, a tube connected to the tube connecting portion of the male connector, and the female connector or the cap detachably attached to the connecting portion. A medical connector characterized by that. The medical connector according to claim 10 , wherein the medical connector is a peritoneal dialysis connector.

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