JP5847452B2 - Catheter connector - Google Patents

Description

  The present invention relates to a catheter connector for connecting a catheter and an infusion device.

  FIG. 12 is a structural diagram of a conventional catheter connector 100. 12, (a) is a structural diagram when the connector main body 101 and the cap 102 are separated, (b) is a structural diagram when the connector main body 101 and the cap 102 are coupled, and (c) is a coupling of the connector main body 101 and the cap 102. It is a structural diagram when is insufficient.

  In FIG. 12A, the rubber tube 103 is inserted into the through hole in the connector main body 101 from the cap 102 side, and is in contact with a step portion in the middle of the through hole. The cap 102 has a female screw portion 106 that is screwed into the male screw portion 105 of the connector main body 101 on the inner peripheral portion on the connector main body 101 side, and the protruding boss 104 is disposed in the cap 102, and the connector main body 101 of the cap 102. It has a projecting surface at a position that enters a predetermined amount from the opening on the side. A catheter (not shown) is inserted into the through hole of the cap 102 from the end opposite to the connector body 101, exits from the central opening of the protruding surface of the protruding boss 104, and passes through the central hole of the rubber tube 103. The tip is brought into contact with the step portion in front of the minimum diameter portion 108 of the through hole of the connector main body 101.

  In FIG. 12B, as the connector main body 101 and the cap 102 are relatively rotated and tightened so as to increase the mutual screwing amount of the male screw portion 105 and the female screw portion 106. The protruding boss 104 presses the end surface of the rubber tube 103 toward the back of the connector main body 101. When the rubber tube 103 receives an axial pressing force from the protruding boss 104, the rubber tube 103 tries to swell both radially outward and inward, but the radially outward bulge is the inner peripheral surface of the connector body 101. Therefore, it is inflated only inward in the radial direction and clamps an inner peripheral side catheter (not shown).

  When the end of the cap 102 comes into contact with the terminal step of the male screw portion 105 of the connector main body 101, the tightening of the connector main body 101 and the cap 102 is completed. At this time, the catheter is fixed to the catheter connector 100 via the rubber tube 103, and the catheter connector 100 is prevented from coming off. In the figure, the central hole of the rubber tube 103 is completely crushed. However, when the catheter is in the central hole of the rubber tube 103, the catheter is not crushed and maintains an appropriate passage area while maintaining the rubber passage. It is fixed to the catheter connector 100 via the tube 103.

  In Patent Document 1, a rigid cylindrical plunger and an elastically deformable cylindrical plug are arranged in a line in a connector body with the center line aligned, and the end of the catheter is placed in the center of the plunger and the plug. A catheter connector that is inserted through the holes in order is disclosed (paragraph 0020 and FIG. 6 of Patent Document 1). In the catheter connector, when the lever that is pivotably coupled to the connector main body is tilted, the plunger pushes the plug in the through hole of the connector main body toward the back of the through hole. It swells inward in the radial direction, and the catheter in the center hole is clamped from outside in the radial direction and fixed (paragraph 0022 and FIG. 2 of Patent Document 1).

  Patent Document 2 discloses a catheter connection hub including a catheter receiving element and a fluid coupling element that are relatively rotatable around an axis (paragraph 0004 and FIG. 1 of Patent Document 2). In the catheter connection hub, the catheter receiving element comprises a sealing sleeve on the fluid coupling element side and a pair of clamping jaws fitted on the outer periphery of the sealing sleeve, and the sealing sleeve and the pair of clamping jaws; Is inserted into a square hole in the fluid coupling element (paragraphs 0016 and 0017 of Patent Document 2). Along with the relative rotation of the catheter receiving element and the fluid coupling element, the pair of clamping jaws rotate relative to each other in the square hole in the fluid coupling element, and the facing distance is increased or decreased by the wall surface of the square hole (Patent Document 2). 11, FIG. 11A, FIG. 11B, FIG. 13 and FIG. 14), when the relative rotation angle between the catheter receiving element and the fluid coupling element becomes zero, the pair of clamping jaws has a mutual interval of zero, The catheter is fixed through the sealing sleeve with a predetermined force (FIG. 13 of Patent Document 2).

Japanese Patent No. 4452620 Special table 2008-552652 gazette

  In FIG. 12C, when the connector main body 101 and the cap 102 are not sufficiently tightened and the gap 110 remains between the end of the cap 102 and the stepped portion of the outer peripheral portion of the connector main body 101, rubber against the catheter is obtained. There is a fear that the clamping pressure of the tube 103 is insufficient, the catheter is not sufficiently fixed, and the catheter is disconnected from the catheter connector 100. Moreover, if the connector main body 101 and the cap 102 are tightened too much, the catheter is blocked.

  In the catheter connector of Patent Document 1, since the lever pushes the plug in the axial direction and compresses the plug, the elasticity of the plug always acts in the direction of releasing the lever when the catheter is connected. Therefore, when the lever is caught by the surrounding object, the lever is easily released from the lock, and the catheter connection may be released.

  The catheter connector of Patent Document 2 is not pressed in the catheter unfixing direction by the sealing sleeve compressed by relative rotation between the catheter receiving element and the fluid coupling element, but in order to fix the catheter in the connection position. After inserting the catheter into the catheter receiving element, the operator must use both hands to rotate the catheter receiving element and the fluid coupling element relative to each other. The element and the fluid coupling element have to be rotated relative to each other, and the operation is troublesome. In addition, if the hand holding the catheter is loosened at the time of connection, there is a risk of causing a connection failure.

  An object of the present invention is to provide a catheter connector having a simple structure while simplifying a fixing operation for fixing a catheter with an appropriate force.

  A catheter connector according to a first aspect of the present invention is a catheter connector for detachably connecting a catheter and an infusion device, and includes a cylindrical portion that houses an end portion of the catheter inserted from one end side, and a second end side of the cylindrical portion. An instrument connecting portion provided to which the infusion device is connected, a projecting portion projecting outward from an axially intermediate portion of the tubular portion, and the axially intermediate portion of the tubular portion externally in a circumferential range other than the projecting portion A connector main body having an open portion that opens to the side, an elastic cylindrical member that is housed in the tubular portion and through which the end portion of the catheter is inserted, and is contracted and closed in the clamping direction of the elastic tubular member that is housed in the tubular portion. A fitting body that is freely fitted on the outer peripheral side of the elastic cylinder member, and an overhanging direction that is guided by the overhanging portion as an operation direction while passing the fitting body on the inner surface side across the open portion. The above An operating member assembled to the main body, and the operating member has a first fitting portion that fits the fitting body in a contracted state at different positions in the operation direction on the inner surface side thereof; The fitting body includes a second fitting portion that is fitted in a contraction release state.

  According to the first invention, when the operating member is switched to the operation position where the fitting body is fitted to the first fitting portion of the operating member, the fitting body applies an appropriate clamping pressure to the catheter via the elastic tubular member. Since the catheter is fixed to the catheter connector, the catheter is fixed with the set clamping pressure. Thereby, operation which fixes a catheter with an appropriate pinching pressure can be facilitated. In addition, since the operation member is guided by the side surface of the overhanging portion, the support during operation is more stable than the catheter connector that fixes the catheter connector by tilting of the operation member or relative rotation of the catheter side member and the infusion side member. Turn into.

  According to the first invention, since the operator can switch the position of the operating member without screwing, the switching operation with one hand becomes possible, and if the catheter is held with another hand, the catheter connection It becomes easy to hold the catheter and switch the operation member at the time.

  The catheter connector according to a second aspect of the present invention is the catheter connector according to the first aspect, wherein the operation member is in a first operation position where the fitting body is fitted to the first fitting portion, and is perpendicular to the operation direction of the operation member. A stopper that is detachably fitted to the outer periphery of both end portions of the cylindrical portion of the connector body, and holds the operation member at the first operation position by contact with the operation member in the operation direction of the operation member. A member is provided.

  According to the second invention, the stopper member can be attached to the connector body to prevent the catheter from being unintentionally released. Moreover, since the attachment of the stopper member to the connector main body can be visually recognized even from a distance, the confirmation that the catheter is fixed to the catheter connector can be made efficient. Furthermore, since the stopper member is fitted to the outer periphery of both ends of the cylindrical portion of the connector main body, even if the catheter connector hits a surrounding object, it can be prevented from being inadvertently detached from the connector main body.

  A catheter connector according to a third aspect of the present invention is the catheter connector according to the second aspect, wherein when the operating member is in the first operating position, the operating member moves to the top surface of the overhanging portion and covers both side surfaces of the overhanging portion. When the fitting body is in the second operating position for fitting the fitting body to the second fitting portion, the both sides of the overhanging portion are exposed away from the top surface of the overhanging portion, and the overhanging portion is exposed. The portion has a groove that is recessed from the top surface and allows an operator to operate the operation member from the first operation position to the second operation position with a finger.

  According to the third invention, when the operator fixes the catheter to the catheter connector, the operator only has to push the operating member toward the overhanging portion, so that the fixing operation is facilitated. Also, when removing the catheter from the catheter connector, if the edges of the operating member on both sides of the groove of the overhanging portion are pushed toward the bottom of the groove with a finger or a tool, the finger or tool will move in the pushing direction. Since it advances in the groove | channel of a top surface, without being blocked | interrupted by the top surface of an overhang | projection part, the removal operation of a catheter becomes easy.

  The catheter connector according to a fourth aspect of the present invention is characterized in that, in any one of the first to third aspects of the invention, the fitting body has a protrusion protruding in the contraction direction on the inner surface side.

  According to the fourth aspect of the invention, since the clamping pressure from the fitting body to the elastic cylinder member is concentrated on the protruding portion of the fitting body, the fitting body can efficiently clamp the elastic cylinder member.

The catheter connector according to a fifth aspect of the present invention is the catheter connector according to any one of the first to fourth aspects of the present invention, wherein the fitting body is configured so that the inner peripheral sides face each other and the mutual distance in the opposite direction can be increased or decreased. A pair of semi-annular members meshing with each other at the end of the pair, and the fitting body is capable of being shrunk by increasing / decreasing the mutual distance in the opposite direction of the pair of semi-annular members. And

  According to the fifth invention, the contraction of the fitting body is not caused by elastic deformation, but is caused by increase / decrease of the meshing amount, thereby increasing the contraction amount and increasing the fixing force of the catheter. Can be increased.

FIG. The longitudinal cross-sectional view of the catheter connector of FIG. FIG. 2 is a cross-sectional view of the catheter connector of FIG. 1. The structure figure of a cylinder side main part. Structure diagram of the clamp. FIG. Structure diagram of clip. Structure of stopper. The structural diagram of the catheter connector with which the stopper is mounted | worn. FIG. 10 is a structural diagram with a section other than the stopper in the catheter connector of FIG. 9. The structure figure of the various modifications of a clip piece. FIG. 6 is a structural diagram of a conventional catheter connector.

  1A is a front view of the catheter connector 10 at the time of releasing the fixation of the catheter 20, and FIG. 1B is a front view of the catheter connector 10 at the time of fixing the catheter 20. The catheter connector 10 includes a connector main body 11 and a clamp 12 assembled to the connector main body 11. The connector main body 11 further includes a base side main body 13 and a cylinder side main body 14 that are coupled to each other. The catheter connector 10 is a disposable type.

  2A is a sectional view taken along the arrow IIa-IIa in FIG. 1A, and FIG. 2B is a sectional view taken along the arrow IIb-IIb in FIG. In FIG. 2, the outer periphery of the end of the base body 13 on the cylinder body 14 side is fitted to the inner periphery of the tube wall 48 of the tube body 14.

  The catheter 20 is inserted into the tube-side main body 14 from the end of the tube-side main body 14 opposite to the base-side main body 13, and extends straight in the tube-side main body 14 toward the base-side main body 13. The elastic tube 21 and the clip 22 are disposed in the cylinder side main body 14, and the elastic tube 21 is inserted through the catheter 20 on the inner peripheral side, and the clip 22 is fitted on the outer peripheral side.

  The through hole of the base side main body 13 has a large diameter part 30, an intermediate diameter part 31, a small diameter part 32, a minimum diameter part 33, and taper parts 34 and 35 in order from the cylinder side main body 14 side. Except for the large-diameter portion 30, the cross-sections of the medium-diameter portion 31, the small-diameter portion 32, the minimum-diameter portion 33, and the tapered portions 34 and 35 are all circular.

  The diameter of the large diameter portion 30 is matched with the outer diameter of the clip 22, the diameter of the medium diameter portion 31 is matched with the outer diameter of the elastic tube 21, and the diameter of the small diameter portion 32 is matched with the outer diameter of the catheter 20. The diameter of the taper portion 34 gradually increases as it moves away from the minimum diameter portion 33 in the axial direction, and the diameter of the taper portion 35 gradually increases as it moves away from the taper portion 34 in the axial direction. The gradient of the tapered portion 34 is larger than that of the tapered portion 35. An infusion device such as a syringe or a conduit is inserted into and connected to the tapered portion 35.

  3, (a) is a sectional view taken along the arrow IIIa-IIIa in FIG. 1 (a), and (b) is a sectional view taken along the arrow IIIb-IIIb in FIG. 1 (b). In FIG. 3, the catheter 20 is not shown. The catheter 20 releases the fixation of the catheter 20 in FIG. 3A, and fixes the catheter 20 in FIG. 3B.

  For convenience of explanation, the catheter connector 10 is defined by the vertical direction as the vertical direction in FIGS. 1 and 2, the axial direction or the longitudinal direction as the horizontal direction in FIGS. 1 and 2, and the width direction as the horizontal direction in FIG. 3. Define. However, for convenience of explanation, the vertical direction of the used catheter connector 10 does not define the vertical direction when the catheter connector 10 is actually used.

  In FIG. 3, the clamp 12 is biased upward with respect to the cylinder side main body 14 in FIG. 3A and exposes both side surfaces of the lower portion of the cylinder side main body 14. On the other hand, in FIG. 3B, it is located in the same range as the cylinder side main body 14 in the up-down direction, and covers the axial central range of the cylinder side main body 14 from the outside.

  4A is a front view of the cylinder-side main body 14, and FIG. 4B is a sectional view taken along the arrow IVb-IVb in FIG. In addition, in (a), about the cylinder wall parts 47 and 48, the upper side part is shown with the cross section from the centerline.

  In FIG. 4, the cylinder part 40 is comprised from the cylinder wall part 47, the circular arc wall part 52, and the cylinder wall part 48 which are arrange | positioned in a line by aligning a centerline, and accommodates the catheter 20 (FIG.1 and FIG.2). The arc wall portion 52 constitutes only the lower wall portion of the tube portion 40, and the tube portion 40 is exposed to the outside on the upper side and both sides in the width direction by the open portions 51 in the range of the arc wall portion 52 in the axial direction. doing. As can be seen from FIG. 4B, the cross section of the cylindrical portion 40 has a shape in which the circular shape is crushed in the vertical direction in FIG. 4B, and the width dimension is made larger than the vertical dimension. Yes. A pair of clip pieces 66a and 66b (FIGS. 7 and 11), which will be described later, are assembled in the tubular portion 40 with the width direction of the catheter 20 as the contraction / contraction direction. The insertion hole 41 is drilled in the end wall of the tube portion 40 on the tube wall portion 47 side, and the catheter 20 (FIG. 2) is inserted therethrough.

  The projecting portion 49 projects from the outer peripheral surface of the arc wall portion 52 outward in the radial direction of the cylindrical portion 40, and serves as a guide surface for the clamp 12 in the operation direction of the clamp 12 on both side surfaces in the width direction. The step portion 53 is formed between the outer peripheral portion of the arc wall portion 52 and the base portion of the overhang portion 49, and engages the claw 61 (FIG. 5) of the clamp 12 so that the clamp 12 moves upward from the tube side main body 14. Stop getting out.

  The overhanging portion 49 has a top surface 54 at the overhanging end, and the recess 50 is formed at a predetermined depth in the center of the top surface 54 in the axial direction of the catheter connector 10, and opens to the side surfaces on both sides of the overhanging portion 49. ing.

  5A is a side view of the clamp 12, and FIG. 5B is a cross-sectional view taken along the line Vb-Vb in FIG. The clamp 12 has a substantially U-shaped cross section that opens on the lower side, and defines a U-groove 56 on the inside. The U groove 56 has a small-diameter fitting portion 57, a connecting portion 58, a large-diameter fitting portion 59 and an opening portion 60 in order from the back side (upper side) to the opening side (lower side). The claw 61 is formed inwardly at the opening end of the opening 60 and prevents the clamp 12 from coming off from the tube side main body 14 by being locked to the stepped portion 53 (FIG. 4B).

  The clamp 12 has a top surface 63 at an upper portion on the outer surface side, and the top surface 63 serves as a finger pressing surface when the operator presses the clamp 12. Although the clamp 12 has a predetermined rigidity, the opening 60 side can be slightly elastically expanded by its U-shaped cross-sectional structure. Therefore, when assembling the clamp 12 to the cylinder side main body 14, the opening 60 is elastically expanded, and the pair of claws 61 are formed in the width direction of the arc wall 52 from the opening 51 (FIG. 4) side. Get over both side walls. The pair of claws 61 are retracted from the width of both side walls of the circular arc wall portion 52 after getting over, and prevent the clamp 12 from coming off from the cylinder side main body 14 by abutting against the stepped portion 53 (FIG. 4). .

  With the assembly of the clamp 12 to the tube side main body 14, the catheter 20, the elastic tube 21 and the clip 22 (FIGS. 2 and 3) are fitted inside the U groove 56 of the clamp 12.

  The small-diameter fitting portion 57 and the large-diameter fitting portion 59 are formed with arcuate cross-sectional contours, and the diameter of the small-diameter fitting portion 57 is set smaller than that of the large-diameter fitting portion 59. When the clip 22 is fitted to the small diameter fitting portion 57, the clamp 12 is a fixing position for fixing the catheter 20, and when the clip 22 is fitted to the large diameter fitting portion 59, the clamp 12 is fixed. Is a fixing release position for releasing the fixation of the catheter 20.

  6, (a) is a front view of the clip piece 66, (b) is a sectional view taken along the arrow VIb-VIb of (a), (c) is a sectional view taken along the arrow VIc-VIc of (a), (d). FIG. 6 is a cross-sectional view taken along the line VId-VId in FIG. The clip 22 (FIG. 2) is composed of two clip pieces 66 that are opposed to each other in the opposite direction on the inner peripheral side. The clip piece 66 includes an arc portion 70 and a protrusion 69 that protrudes radially inward from the inner peripheral surface of the arc portion 70.

  The arc portion 70 has convex portions 67 and concave portions 68 alternately in the longitudinal direction at both ends in the circumferential direction. The locking groove 71 extends from the end of the arc portion 70 to the end of the protrusion 69 in the longitudinal direction of the clip piece 66 at the same circumferential position as the protrusion 69 in the arc portion 70. The overhanging wall 48 (FIG. 4A) of the cylindrical wall portion 47 is fitted into the locking groove 71, and the clip piece 66 is positioned in the cylindrical portion 40 in the circumferential direction.

  7A is a plan view when the clip 22 is expanded, FIG. 7B is a plan view when the clip 22 is contracted, and FIG. 7C is a cross-sectional view taken along the arrow VIIc-VIIc in FIG. ) Is a sectional view taken along arrow VIId-VIId in (b). In FIG. 7, in order to distinguish the two clip pieces 66, suffixes a and b are attached to one and the other clip pieces 66. a and b are also attached to each part of the clip piece 66. The pair of clip pieces 66a and 66b are assembled with the inner peripheral surfaces facing each other so that the convex portion 67a fits into the concave portion 68b and the convex portion 67b fits into the concave portion 68a. One clip 22 is configured.

  Since the pair of clip pieces 66a and 66b are engaged with each other in the opposite direction in which the inner peripheral sides are opposed to each other, the mutual distance in the opposite direction can be increased or decreased. As a result, the pair of clip pieces 66a and 66b are assembled in the cylindrical portion 40 so that the overhanging wall 48 (FIG. 4A) of the cylindrical wall portion 47 is fitted into the locking groove 71 (FIG. 6). The facing direction of the pair of clip pieces 66a and 66b is the width direction of the catheter connector 10, and the distance in the width direction between the clip pieces 66a and 66b is a small diameter fitting portion 57 or a large diameter fitting portion 59 (see FIG. It will be increased or decreased by fitting the clip 22 to 5).

  When the clip 22 is in the expanded state (= the contraction release state), as shown in FIGS. 7A and 7C, the gap 73 is formed between the convex portion 67 of one clip piece 66 and the other clip piece 66. The distance between the two clip pieces 66 in the width direction is increased. On the other hand, when the clip 22 is in the contracted state, as shown in FIGS. 7B and 7D, the top surface of the projection 67 of one clip piece 66 is the recess 68 of the other clip piece 66. The gap 73 is lost and the distance in the width direction of both clip pieces 66 is reduced. When the clip 22 is fitted to the small diameter fitting portion 57 of the clamp 12 (FIG. 5), the clip 22 is in a contracted state, and when the clip 22 is fitted to the large diameter fitting portion 59, the clip 22 is in an expanded state.

  Before describing the stopper 76 in FIGS. 8 to 10, the operation of the catheter connector 10 when the stopper 76 is not attached will be described. The base body 13 corresponds to the instrument connecting portion of the present invention, the elastic tube 21 corresponds to the elastic cylindrical member of the present invention, the clip 22 corresponds to the fitting body of the present invention, and the recess 50 corresponds to the present invention. The small-diameter fitting portion 57 corresponds to the first fitting portion of the present invention, the large-diameter fitting portion 59 corresponds to the second fitting portion of the present invention, and the clip piece 66 of the present invention. The stopper 76 corresponds to a semi-annular member, and corresponds to the stopper member of the present invention.

  When the clamp 12 is in the unlocked position (each (a) in FIGS. 1 to 3), the clip 22 is fitted into the large-diameter fitting portion 59 (FIG. 5) of the clamp 12 and is in an expanded state. Yes. When the clamp 12 is in the fixed position (each (b) in FIGS. 1 to 3), the clip 22 is fitted into the small-diameter fitting portion 57 (FIG. 5) of the clamp 12 and is in a contracted state.

  At the fixed release position of the clamp 12, the elastic tube 21 is not pinched radially inward from the protrusion 69 of the clip 22, and thus has a sufficiently increased inner diameter. Therefore, even if the catheter 20 (FIG. 2) is inserted into the elastic tube 21, the catheter 20 is not fixed to the catheter connector 10 because it does not receive a clamping pressure from the elastic tube 21. In this state, the catheter 20 can be inserted into and removed from the tube side main body 14.

  The operator inserts the distal end of the catheter 20 into the tubular portion 40 from the insertion hole 41 (FIG. 4A) when the clamp 12 is in the unlocking position, and further inserts the catheter 20 into the tubular body 14. Is pushed into the elastic tube 21 and is brought into contact with the stepped portion behind the small diameter portion 32 (FIG. 10).

  Next, the surgeon attaches the top surface 63 of the clamp 12 and the side surface of the tube wall portions 47 and 48 of the tube side body 14 on the side of the overhanging portion 49 or the top surface 54 of the overhanging portion 49 to the fingers other than the thumb and thumb of one hand. The clamp 12 is switched from the fixed release position to the fixed position by pressing the top surface 63 toward the top surface 54 with the thumb. At that time, the operator holds the catheter 20 with another hand and holds the catheter 20 in a state where the catheter 20 is sufficiently pushed toward the back of the tube-side main body 14.

  When the clamp 12 is in the fixed position, the clip 22 is fitted in the small diameter fitting portion 57 of the U groove 56 of the clamp 12 and is in a contracted state. The elastic tube 21 is squeezed radially inward from the protrusion 69 of the clip 22 in the contracted state and is prevented from bulging outward in the radial direction by the arc portion 70, so that it swells radially inward. The inner diameter is reduced and the inner peripheral catheter 20 (FIG. 2) is clamped with a predetermined force. As a result, the catheter 20 is held by the cylinder body 14 via the elastic tube 21 and the clip 22 and is fixed to the catheter connector 10. The insertion portion of the catheter 20 in the elastic tube 21 is slightly increased in length when receiving the clamping pressure from the elastic tube 21, but this increase causes the tip of the insertion portion to be a stepped portion behind the small diameter portion 32 (FIG. 10). Further, the sealing performance at the distal end of the catheter 20 is enhanced.

  When the surgeon switches the clamp 12 from the fixed position to the fixed release position, the operator applies a finger other than the thumb of one hand to the cylindrical wall portions 47, 48, and puts the thumb in the vicinity of the recess 50 of the overhang portion 49. Touch the edge, and then push the edge toward the top surface 63 with your thumb. At that time, the thumb moves to the top surface 63 in the recess 50 without being disturbed by the overhanging portion 49, and the clamp 12 is switched from the fixed position to the fixed release position. Instead of the thumb, the operator can use a tool whose tip is shorter than the recess 50 in the axial direction of the catheter connector 10.

  The clamp 12 has a predetermined elasticity in the width direction. Therefore, when the clip 22 passes through the connecting portion 58 with a pressing force equal to or greater than a predetermined value from the operator, the clip 22 is elastically expanded in the width direction to allow passage of the clip 22 in the connecting portion 58. When the clamp 12 reaches the small-diameter fitting portion 57 or the large-diameter fitting portion 59, the pushing force from the surgeon to the clamp 12 is also released, so that the expansion of the connecting portion 58 of the clamp 12 is released, and in the connecting portion 58 The width returns to the original dimensions.

  The stopper 76 will be described with reference to FIGS. The stopper 76 is one of the components of the catheter connector 10. 8A is a front view of the stopper 76, and FIG. 8B is a left side view of the stopper 76. The stopper 76 has a U-shaped contour U-shaped groove 77 and leg wall portions 78 and 79 that define both sides of the U-shaped groove 77, and the inside is appropriately hollow.

  In the axial direction of the catheter connector 10, one leg wall portion 78 is formed over the entire U groove 77, whereas the leg wall portion 79 has two intermediate portions of the U groove 77 and two at both ends. Is formed. The U-shaped contour of the U groove 77 is matched with the contours of the side surfaces of the cylindrical wall portions 47 and 48. In the axial direction of the catheter connector 10, the gap between the two leg walls 79 is equal to the overhang 49. The leg wall portions 78 and 79 are elastically expandable in the width direction of the U groove 77.

  9 and 10 both show the structure of the catheter connector 10 in a state where the stopper 76 is mounted, and in FIG. 10, portions other than the stopper 76 are shown in cross section. At the fixed position of the clamp 12, the top surface 63 of the clamp 12 is substantially flush with the upper surfaces of the cylinder wall portions 47 and 48 of the cylinder side main body 14. The operator moves the stopper 76 to the cylinder side main body 14 (from the back side to the front side in FIG. 9) so that the cylinder wall portions 47 and 48 fit into the U groove 77 (FIG. 8) at the clamp 12 fixing position. Push in).

  At that time, the stopper 76 moves while the opening width of the U groove 77 is elastically expanded by the cylinder wall portions 47 and 48 of the cylinder side main body 14. When the cylinder wall portions 47 and 48 reach the back of the U groove 77, the mounting of the stopper 76 on the cylinder side main body 14 is finished. At the end, the width of the U-groove 77 expanded at the start of mounting does not completely return to the original width at the end of mounting and maintains the expanded state. It remains as a clamping force of the stopper 76 and becomes a sufficiently large fixing force between the cylinder side main body 14 and the stopper 76. This fixing force serves as a deterring force for the stopper 76 to be detached from the cylinder-side main body 14 when the catheter connector 10 hits a surrounding object and receives an impact.

  When the stopper 76 is in the mounted state on the cylinder-side main body 14, the leg wall portion 78 abuts on the top surface 63 to prevent the clamp 12 from moving from the fixed position to the fixed release position. Thereby, switching of the clamp 12 from the unintended fixed position to the fixed release position is prevented.

  When removing the stopper 76 from the cylinder side main body 14, the base side main body 13 protruding from the stopper 76 in the axial direction is held with one hand, and the surface portion of the stopper 76 where the clamp 12 is exposed (FIG. 8). The surface portion that is visible in FIG. 2 is pushed into the base body 13 with the other hand. Thereby, the surface of the leg wall portions 78 and 79 on the U groove 77 side slides on the cylindrical wall portions 47 and 48, and the stopper 76 is removed from the cylindrical side main body 14.

  Although the present invention has been described with respect to the embodiments, various modifications can be made within the scope of the paper of the present invention.

  For example, the clip piece 66 constituting the clip 22 can adopt various structures shown in FIG. 11 in addition to the structures shown in FIGS. 6 and 7. Each structural example of the clip 22 will be described with reference to FIG. In FIG. 11, a suffix a is attached to one of the pair of clip pieces 66 and a portion thereof, and a suffix b is attached to the other and the portion thereof. Further, in FIGS. 11A to 11D, the upper side shows an expanded state, and the lower side shows a contracted state.

  In FIG. 11, (a), the clip pieces 66a and 66b have the same structure having both the protrusions 69a and 69b, and face each other on the inner peripheral side when assembled. In (b), only the clip piece 66a has the protrusion 69a, and the clip piece 66b does not have the protrusion. The protrusion 69a of (b) is almost double the protrusion amount of the protrusion 69a of (a).

  In (c), the clip pieces 66a and 66b do not have protrusions. Instead, the thickness of the circular arc portions 70a, b is increased from the thickness of the circular arc portions 70a, b of (a) and (b), and the amount of elastic deformation in the radial direction is increased. In (d), the clip pieces 66 a and 66 b are connected by a hinge 74. In the clip pieces 66a and 66b in (d), the convex portion 67 and the concave portion 68 (FIG. 6) can be omitted.

DESCRIPTION OF SYMBOLS 10 ... Catheter connector, 11 ... Connector main body, 13 ... Base side main body (instrument connection part), 14 ... Tube side main body, 20 ... Catheter, 21 ... Elastic tube (elastic cylinder) Member), 22 ... clip (fit body), 40 ... cylinder part, 49 ... overhang part, 50 ... recess (groove), 51 ... open part, 54 ... top Surface, 57... Small diameter fitting portion (first fitting portion), 59... Large diameter fitting portion (second fitting portion), 60... Opening portion, 63. ... Clip pieces (semi-annular members), 69 ... ridges, 76 ... stoppers (stopper members).

Claims (5)

A catheter connector for detachably connecting a catheter and an infusion device,
A tubular portion for storing the end portion of the catheter inserted from one end side, an instrument connecting portion provided on the other end side of the tubular portion to which the infusion device is connected, and an outer side from an axially intermediate portion of the tubular portion A connector main body having a projecting portion that projects outward, and an open portion that opens the axial intermediate portion of the cylindrical portion to the outside in a circumferential range other than the projecting portion;
An elastic tubular member that is housed in the tubular portion and through which the end portion of the catheter is inserted;
A fitting body that is housed in the cylindrical portion and is fitted to the outer peripheral side of the elastic cylindrical member so as to be freely retractable in the clamping direction of the elastic cylindrical member;
An operation member that is assembled to the connector main body so as to be guided by the overhanging portion as an operation direction while passing the fitting body on the inner surface side across the open portion;
The operation member is fitted to the first fitting portion in which the fitting body is fitted in a contracted state at different positions in the operation direction on the inner surface side thereof, and the fitting body is fitted in a contracted release state. A catheter connector comprising a second fitting portion. The catheter connector of claim 1,
When the operation member is in a first operation position for fitting the fitting body to the first fitting portion, outer peripheral portions of both end portions of the tubular portion of the connector body from a direction perpendicular to the operation direction of the operation member A catheter connector comprising: a stopper member that is detachably fitted to the operation member and holds the operation member at the first operation position by contact with the operation member in an operation direction of the operation member. The catheter connector according to claim 2,
When the operating member is in the first operating position, the operating member moves to the top surface of the overhanging portion to cover both side surfaces of the overhanging portion, and the fitting body is fitted into the second fitting portion. When in the second operation position to be combined, the two side surfaces of the overhang portion are exposed away from the location of the top surface of the overhang portion,
The overhanging portion has a groove that is recessed from the top surface and allows an operator to operate the operation member from the first operation position to the second operation position with a finger. connector. The catheter connector according to any one of claims 1 to 3,
The said fitting body has the protrusion which protrudes in a contraction direction on the inner surface side, The catheter connector characterized by the above-mentioned. The catheter connector according to any one of claims 1 to 4,
The fitting body is composed of a pair of semi-annular members that face each other on the inner peripheral side and mesh with each other at end portions in the circumferential direction so that the mutual distance in the facing direction can be increased or decreased .
The catheter connector is characterized in that the fitting body can be contracted and retracted by increasing or decreasing the mutual distance in the opposite direction in the pair of semi-annular members .

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