JP6568714B2 - Catheter assembly - Google Patents

Description

  The present invention relates to a catheter assembly that punctures and indwells a blood vessel when, for example, infusion is performed on a patient.

  Conventionally, for example, a catheter assembly is used when infusion or the like is performed on a patient. This type of catheter assembly includes a hollow catheter, a catheter hub fixed to the proximal end of the catheter, a hollow inner needle that is inserted into the catheter and has a sharp needle tip, and a proximal end of the inner needle. And a needle hub secured to the.

  In such a catheter assembly, the catheter hub is housed in a housing (needle hub) that can be separated vertically in the initial state in which the tip of the inner needle protrudes from the tip of the catheter (see, for example, Patent Document 1). In the initial state, the upper housing and the lower housing are locked in a state of being engaged with each other so as to support the catheter. On the other hand, after the patient has punctured the inner needle, the lock is released and the upper housing and the lower housing can be separated before the catheter is advanced (advanced) to the distal end side with respect to the inner needle. When the catheter is advanced with respect to the inner needle, the upper housing and the lower housing are separated from each other and the catheter hub is detached from the housing.

Special table 2013-529111 gazette

  However, in the catheter assembly as described in Patent Document 1 described above, before the catheter is advanced with respect to the inner needle, the lock of the engaged state between the upper housing and the lower housing is released. Therefore, when the catheter is advanced with respect to the inner needle, the catheter and the inner needle may bend due to the resistance force (the friction resistance force between the catheter and the patient's skin) that the catheter receives, and the user may feel uncomfortable. In addition, the tip of the inner needle may slip out of the patient's skin, or the catheter may pierce when the tip of the inner needle that has slipped out of the skin advances due to restoring force.

  The present invention has been made in consideration of such problems, and provides a catheter assembly in which a catheter can be smoothly inserted into a blood vessel without a sense of incongruity, and a catheter hub can be easily detached from a housing. The purpose is to provide.

In order to achieve the above object, a catheter assembly according to the present invention includes a hollow catheter, a catheter hub fixed to a proximal end portion of the catheter, a hollow inner needle inserted through the catheter, A housing that supports the inner needle and in which the catheter hub is disposed in an initial state in which the distal end of the inner needle protrudes from the distal end of the catheter, a support member that supports the catheter, and the catheter hub connected to the catheter hub A catheter operating member displaceable along a longitudinal direction of the housing with respect to the housing, and the support member maintains support of the catheter when the catheter advances toward the distal end side with respect to the inner needle. The housing is switchable between a locked state and an unlocked state allowing the catheter hub to be detached from the housing. Is, the support member is characterized Rukoto switch to the unlock state from the locked state by said catheter operating member is displaced to the tip side of the catheter relative to the housing.

According to the catheter assembly configured as described above, since the support of the catheter is maintained when the support member is locked to advance the distal end side with respect to the inner needle, the resistance that the catheter receives is maintained. It is possible to prevent the catheter and the inner needle from being bent by force. As a result, the catheter can be smoothly inserted into the blood vessel without a feeling of strangeness. In addition, after inserting the catheter into the blood vessel, the catheter hub can be easily detached from the housing by bringing the support member into an unlocked state. Furthermore, the user can switch the support member from the locked state to the unlocked state only by displacing the catheter operating member toward the distal end side of the catheter with respect to the housing. Thereby, the operativity of a catheter assembly can be improved.

A catheter assembly according to the present invention includes a hollow catheter, a catheter hub fixed to a proximal end portion of the catheter, a hollow inner needle inserted through the catheter, the inner needle, and the catheter assembly . A housing in which the catheter hub is disposed in an initial state in which the distal end of the inner needle protrudes from a distal end; and a support member that supports the catheter; The housing is provided so as to be switchable between a locked state for maintaining the support of the catheter and an unlocked state for allowing the catheter hub to be detached from the housing when the catheter is advanced to the distal end side. displacement with respect to the housing, characterized that you have been restricted in the state.

  According to such a configuration, the catheter can be stably supported by the support member.

  In the above-described catheter assembly, the support member may be detached from the housing in the distal direction when the catheter operating member is displaced relative to the distal end side of the catheter with respect to the housing in the unlocked state. Good.

  According to such a configuration, it is possible to suppress interference between the support member and the catheter hub when the catheter hub is detached from the housing, so that the catheter hub can be easily detached from the housing.

  In the catheter assembly, the support member includes a support member main body that contacts the catheter, a first position that is provided on the support member main body, and is engaged with the housing. A cam holding portion configured to bring the support member into the locked state by contacting the cam and holding the cam in the first position. And a cam holding / releasing part that makes the support member in the unlocked state by allowing the cam to be displaced from the first position to the second position.

  According to such a configuration, the support member can be switched between the locked state and the unlocked state with a simple configuration.

  In the catheter assembly, the support member main body is formed with an insertion hole through which the catheter operation member is inserted, and a disposition hole in communication with the insertion hole and in which the cam is disposed, and the housing Is formed with a fitting hole into which the cam can be fitted, and the cam is held in the first position to be fitted into the fitting hole when the cam holding portion is located in the insertion hole, When the cam holding release portion is located in the insertion hole, the cam holding release portion may be displaceable from the first position to the second position that is detachable from the fitting hole.

  According to such a configuration, since the cam is held at the first position where the cam is fitted into the fitting hole in the locked state, the catheter can be stably supported by the support member main body.

  In the above catheter assembly, the cam is formed with a guide surface that guides the cam from the first position to the second position as the cam is displaced toward the distal end side of the catheter with respect to the housing. May be.

  According to such a configuration, the cam can be easily displaced from the first position to the second position by the action of the guide surface.

  In the above catheter assembly, the cam may have a stopper portion that prevents the cam from coming out of the arrangement hole.

  According to such a configuration, it is possible to prevent the cam from being separated from the support member main body, so that the operability of the catheter assembly can be improved.

  The catheter assembly may further include holding means for releasably holding the cam in the second position.

  According to such a configuration, the cam can be prevented from interfering when the support member detached from the housing is mounted on the housing again.

  In the above catheter assembly, the housing may be provided with a notch that opens to the distal end side of the catheter, and the support member may be provided with a convex portion that is inserted into the notch.

  According to such a configuration, since the support member main body is firmly held by the housing, the catheter can be more stably supported by the support member main body.

  In the above catheter assembly, the catheter may be supported in contact with both the support member and the housing.

  According to such a configuration, the catheter can be supported more stably.

  According to the present invention, since the support of the catheter is maintained when the catheter advances to the distal end side with respect to the inner needle by setting the support member in the locked state, the catheter can be smoothly inserted into the blood vessel without a sense of incongruity. Can do. Moreover, the catheter hub can be easily detached from the housing by setting the support member to the unlocked state.

It is a perspective view of the catheter assembly concerning a 1st embodiment of the present invention. FIG. 2 is an exploded perspective view of the catheter assembly of FIG. 1. 3A is a perspective view of the housing of FIG. 2 as viewed obliquely from above, and FIG. 3B is a perspective view of the support member body of FIG. 2 as viewed from obliquely below. FIG. 2 is a partial longitudinal sectional view of the catheter assembly of FIG. 1. 5A is a cross-sectional view showing a first state of the support member of FIG. 1, and FIG. 5B is a cross-sectional view showing a second state of the support member of FIG. FIG. 6A is a first diagram illustrating a method of using the catheter assembly of FIG. 1, and FIG. 6B is a second diagram illustrating a method of using the catheter assembly of FIG. FIG. 7A is a third view for explaining how to use the catheter assembly of FIG. 1, and FIG. 7B is a fourth view for explaining how to use the catheter assembly of FIG. It is sectional drawing which shows the modification of the supporting member of FIG. It is a perspective view of the catheter assembly which concerns on 2nd Embodiment of this invention. FIG. 10 is an exploded perspective view of the catheter assembly of FIG. 9. It is the perspective view which looked at the catheter operation member of FIG. 9, and the catheter member from the downward direction. 12A is a perspective view of the support member of FIG. 10 as viewed from obliquely below, and FIG. 12B is a perspective view of the support member of FIG. 10 as viewed from obliquely above. 13A is a plan view of the state in which the support member of FIG. 9 is in the closed position as viewed from below, and FIG. 13B is a plan view of the state in which the support member of FIG. 9 is in the open position as viewed from below.

  Hereinafter, preferred embodiments of the catheter assembly according to the present invention will be described with reference to the accompanying drawings.

(First embodiment)
The catheter assembly 10A according to the present embodiment, which is shown in an initial state in FIG. 1, is applied when infusion or blood transfusion is performed on a patient (living body), and is punctured and indwelled in the patient's body to construct an introduction portion for a medicinal solution or the like To do. The catheter assembly 10A can be configured as a catheter that is longer than the peripheral venous catheter (eg, central venous catheter, PICC, midline catheter, etc.). The catheter assembly 10A may be configured as a peripheral venous catheter. Further, the catheter assembly 10A is not limited to a venous catheter, and may be configured as an arterial catheter such as a peripheral artery catheter.

  As shown in FIGS. 1 and 2, the catheter assembly 10 </ b> A includes a catheter 12, a catheter hub 14 that fixes and holds the catheter 12, a hollow inner needle 16 that is removably inserted into the catheter 12, and an inner needle. A housing 18 for fixing and holding 16, a catheter operating member 20 mounted on the upper side of the catheter hub 14, an auxiliary member 22 removably inserted between the catheter 12 and the inner needle 16, and fixing and holding the auxiliary member 22. An auxiliary member hub 24, a needle protection member 26 connected to the proximal end of the catheter hub 14 and the auxiliary member hub 24, and a support member 27 provided on the housing 18 to support the catheter 12. The inner needle 16 may be partially cut out along the axial direction. Further, the inner needle 16 may be a solid needle.

  In the initial state before use, the catheter assembly 10A forms a multiple tube structure (multiple tube portion) in which the catheter 12, the auxiliary member 22, and the inner needle 16 are sequentially stacked.

  The catheter 12 is flexible and has a lumen 13 formed therethrough. The lumen 13 is formed to have a diameter that can accommodate the inner needle 16 and the auxiliary member 22 and can flow a drug solution, blood, or the like. In order to reduce puncture resistance, the distal end of the catheter 12 is reduced in diameter. The length of the catheter 12 is not particularly limited and can be appropriately designed according to the application and various conditions. For example, the length of the catheter 12 is set to about 14 to 500 mm, or about 30 to 400 mm, or about 76 to 200 mm. Is set.

  The constituent material of the catheter 12 is not particularly limited, but a soft resin material is suitable, for example, polytetrafluoroethylene (PTFE), ethylene-tetrafluoroethylene copolymer (ETFE), perfluoroalkoxy fluororesin. Fluorine resins such as (PFA), olefin resins such as polyethylene and polypropylene, or a mixture thereof, polyurethane, polyester, polyamide, polyether nylon resin, a mixture of olefin resin and ethylene / vinyl acetate copolymer, etc. It is done.

  The proximal end portion of the catheter 12 is fixed to the distal end portion in the catheter hub 14 by an appropriate fixing method (caulking, fusing, bonding, etc.). A catheter member 17 is constituted by the catheter 12 and the catheter hub 14.

  The catheter hub 14 is exposed on the patient's skin in a state where the catheter 12 is inserted into the blood vessel, and is affixed with a tape or the like and placed with the catheter 12. The catheter hub 14 is formed in a cylindrical shape tapered in the distal direction.

  The constituent material of the catheter hub 14 is not particularly limited, and for example, a thermoplastic resin such as polypropylene, polycarbonate, polyamide, polysulfone, polyarylate, methacrylate-butylene-styrene copolymer may be applied.

  Inside the catheter hub 14, a hollow portion 15 that is in communication with the lumen 13 of the catheter 12 and through which an infusion solution can be circulated is provided. The hollow portion 15 may contain a hemostasis valve, a plug, etc. (not shown) that prevent backflow of blood when the inner needle 16 is punctured and enable infusion with insertion of a connector of an infusion tube.

  As shown in FIG. 2, an annular protrusion 28 that protrudes radially outward and circulates in the circumferential direction of the catheter hub 14 is formed near the distal end of the outer peripheral surface of the catheter hub 14. The proximal end of the catheter hub 14 is provided with a threaded portion 30 that protrudes radially outward and extends in the circumferential direction. After the inner needle 16 is detached, an infusion tube connector (not shown) is connected. The

  On the other hand, the inner needle 16 of the catheter assembly 10 </ b> A is configured as a hollow tube having rigidity capable of piercing the skin of a living body, and penetrates the lumen 13 of the catheter 12 and the hollow portion 15 of the catheter hub 14. The inner needle 16 is formed to have a full length longer than that of the catheter 12, and a sharp needle tip 16a is provided at the tip thereof.

  In the initial state shown in FIG. 1, the multiple tube portion exposes the needle tip 16 a from the catheter 12 and the auxiliary member 22. A lumen that penetrates in the axial direction of the inner needle 16 is provided inside the inner needle 16, and this lumen communicates with the distal end opening of the inner needle 16. Note that a groove portion for flashback confirmation may be provided on the outer peripheral surface of the inner needle 16 along the axial direction.

  Examples of the constituent material of the inner needle 16 include stainless steel, aluminum or aluminum alloy, metal material such as titanium or titanium alloy, hard resin, ceramics, and the like. The inner needle 16 is firmly fixed to the housing 18 by an appropriate fixing method (fusion, adhesion, insert molding, etc.).

  In the housing 18, a part of the multiple tube portion, the catheter hub 14, the catheter operation member 20, the auxiliary member hub 24, the needle protection member 26, and the support member 27 are disposed (accommodated) in the initial state. Although the resin material which comprises the housing 18 is not specifically limited, For example, the material quoted by the catheter hub 14 can be selected suitably.

  As shown in FIG. 2, the housing 18 includes a lower wall 32, a pair of first side walls 34 a and 34 b protruding upward from the side edge on the distal end side of the lower wall 32, and side edges of the base end portion of the lower wall 32. A pair of second side walls 35 a and 35 b protruding upward from the upper surface, and a needle holding portion 36 that protrudes upward from the upper surface of the proximal end portion of the lower wall 32 and fixes and supports the proximal end portion of the inner needle 16.

  As shown in FIGS. 3A and 4, the lower wall 32 has a distal end portion extending upward from the base end side, and an upper surface of the distal end portion of the lower wall 32 is recessed in an arc shape. A first support groove having a semicircular cross-sectional shape in which the catheter 12 is disposed at the center in the width direction (direction perpendicular to the longitudinal direction and the vertical direction of the housing 18) of the upper surface of the tip of the lower wall 32 38 is formed along the longitudinal direction. A first recess 40 having a semicircular cross-sectional shape is formed at the center in the longitudinal direction of the inner surface of the first support groove 38. Thereby, the sliding resistance between the outer surface of the catheter 12 and the inner surface of the first support groove 38 can be suitably suppressed.

  The cross-sectional shape of the first support groove 38 and the first recess 40 is not limited to a semicircular shape, and may be an arc shape other than the semicircular shape. Further, in the catheter assembly 10A, the first support groove 38 and the first recess 40 may not be provided. In this case, the catheter 12 contacts the upper surface of the distal end portion of the lower wall 32.

  The pair of first side walls 34a, 34b extend in parallel with the lower wall 32 in the longitudinal direction, and are formed such that the vertical width on the distal end side is narrower than the vertical width on the proximal end side. Cutout portions 42a and 42b that open to the front end side are formed at the approximately vertical center of each of the first side walls 34a and 34b. In addition, a rectangular fitting hole 44 extends in the longitudinal direction slightly on the proximal side from the cutout portion 42a of the first side wall 34a. The notches 42 a and 42 b and the fitting hole 44 are for holding the support member 27 with respect to the housing 18. The pair of second side walls 35a and 35b extend in parallel to the longitudinal direction together with the lower wall 32, and are formed with a constant vertical width. The needle holding part 36 is located between the pair of second side walls 35a and 35b.

  Since the housing 18 holds the inner needle 16 in the needle holding portion 36, when the housing 18 is moved in the proximal direction relative to the catheter 12, the inner needle 16 also moves relative to the catheter 12 as the housing 18 moves. To move in the proximal direction. That is, the housing 18 also has a function as a needle hub fixed to the proximal end of the inner needle 16. The needle holding portion 36 may be formed separately from the housing 18 and bonded and fixed to the housing 18.

  In the catheter assembly 10 </ b> A, as shown in FIG. 1, the catheter hub 14 and the needle protection member 26 are exposed from the housing 18 in an initial state. The catheter assembly 10A may be configured to surround the catheter hub 14 and the needle protection member 26 by forming a side wall in the longitudinal center of the housing 18, and an upper wall is formed on the housing 18 or a lid is attached. Or the structure which covers the catheter hub 14, the needle protection member 26, etc. may be sufficient.

  The catheter operating member 20 is attached to the catheter hub 14 to move the catheter 12 and the catheter hub 14 forward and backward relative to the inner needle 16 and the housing 18. Specifically, the catheter operation member 20 is integrated with the flat plate portion 46 extending in the distal end and proximal direction, the operation portion 48 extending upward from the distal end of the flat plate portion 46 in the proximal direction, and the proximal end of the flat plate portion 46. A hub mounting portion 50 that is molded and detachable from the catheter hub 14 is provided.

  The operation unit 48 is a part where the user's fingers are touched and the catheter 12 is advanced or retracted. The flat plate portion 46 is flexible and can be easily bent in a direction perpendicular to the surface direction of the flat plate portion 46 by being formed thin. Although the material which comprises the flat plate part 46 (catheter operation member 20) is not specifically limited, For example, the material quoted by the catheter hub 14 can be selected suitably.

  The flat plate portion 46 includes a wide portion (cam holding portion) 52 that extends with a constant width dimension from the front end to a little before the base end, and a narrow width portion that forms the base end portion of the flat plate portion 46. (Cam holding release portion) 54.

  The narrow portion 54 is formed by cutting out a side portion of the base end portion of the flat plate portion 46 in the direction in which the fitting hole 44 is located. A first inclined surface 56 is formed on the side surface in the direction in which the fitting hole 44 is located in the boundary portion between the wide portion 52 and the narrow portion 54, and is inclined toward the side where the fitting hole 44 is located in the distal direction. ing. The hub mounting portion 50 is configured to be capable of displacing (advancing) the catheter hub 14 toward the distal end side by an operation in the distal end direction. The hub mounting portion 50 is rotatable in the circumferential direction with respect to the catheter hub 14 while being mounted on the catheter hub 14.

  The auxiliary member 22 is removably inserted inside the catheter 12 in order to prevent the inner surface of the catheter 12 from being damaged by the tip of the inner needle 16 and to strengthen the rigidity of the catheter 12 when the catheter 12 is inserted into the blood vessel. It is a long member having flexibility. Specifically, in the initial state of the catheter assembly 10 </ b> A, the auxiliary member 22 is disposed between the catheter 12 and the inner needle 16 along the extending direction of the catheter 12. In the present embodiment, the auxiliary member 22 is formed in a tube shape, and the inner needle 16 is inserted into the lumen of the auxiliary member 22.

  In the case of the present embodiment, in the initial state of the catheter assembly 10 </ b> A, the most distal portion of the auxiliary member 22 is located on the proximal side with respect to the most distal portion of the catheter 12. The most distal end of the auxiliary member 22 may be located at the same position as the most distal end of the catheter 12 or on the distal end side of the most distal end of the catheter 12.

  The shape of the auxiliary member 22 is not limited to the tube shape, but may be a circular shape having a C-shaped cross-section cut away in the circumferential direction, or a shape having an arc-shaped cross section of less than 180 ° in the circumferential direction. But you can. Further, the auxiliary member 22 may be configured to have a gap that penetrates the inside and outside of the auxiliary member 22, for example, a coil shape, a mesh shape, or the like.

  Examples of the constituent material of the auxiliary member 22 include a resin material (for example, one or more materials selected from the resin materials exemplified as the constituent material of the catheter 12) and a metal material (for example, stainless steel, a superelastic alloy, etc.). .

  The auxiliary member hub 24 is made of, for example, a hard resin similar to the catheter hub 14 and is fixed to the proximal end portion of the auxiliary member 22. The auxiliary member hub 24 is formed in a hollow shape. In the initial state, the distal end portion of the auxiliary member hub 24 is detachably fitted to the inner peripheral portion of the proximal end of the catheter hub 14, and the distal end portion of the needle protection member 26. Is fitted to the inner peripheral portion of the proximal end of the auxiliary member hub 24 and is detachably engaged with the outer peripheral portion (screw portion 30) of the proximal end of the catheter hub 14.

  In the catheter assembly 10A, when the diameter of the catheter 12 is relatively large and the necessity for assistance (support) from the inside for strengthening rigidity is low, the auxiliary member 22 may not be provided. In this case, if the auxiliary member hub 24 is provided as it is, the configuration of the needle protection member 26 may be the same as that of the illustrated example, and the needle protection member 26 is formed with and without the auxiliary tube. There is no need to prepare two molds. That is, in either case, the needle protection member 26 can be formed with a mold having the same shape.

  Further, the auxiliary member hub 24 may not be provided in the catheter assembly 10A. In this case, the proximal end portion of the auxiliary member 22 is directly fixed to the needle protection member 26, and the distal end shape of the needle protection member 26 is formed to be detachably fitted to the proximal end inner peripheral portion of the catheter hub 14. Is done. Further, in the catheter assembly 10A, the auxiliary member 22 and the auxiliary member hub 24 may not be provided. Also in this case, the distal end shape of the needle protection member 26 is formed so as to be removably fitted to the proximal inner peripheral portion of the catheter hub 14.

  A leaf spring-shaped shutter 58 is disposed inside the needle protection member 26. In the initial state, the shutter 58 is pressed and compressed by the outer surface of the inner needle 16. On the other hand, when the inner needle 16 moves backward with respect to the needle protection member 26 and the needle tip 16a of the inner needle 16 moves to the proximal end side with respect to the shutter 58, the pressure on the shutter 58 by the inner needle 16 is released. Expand (open) by elastic restoring force. Thereby, the needle insertion path in the needle protection member 26 is blocked. A retaining member 60 is provided in the proximal end portion of the needle protecting member 26 so that the inner needle 16 does not come out from the needle protecting member 26 in the proximal direction.

  As shown in FIGS. 1 and 2, the support member 27 is a member that supports the catheter 12 and is detachable from the distal end portion of the housing 18. Although the resin material which comprises the supporting member 27 is not specifically limited, For example, the material quoted by the catheter hub 14 can be selected suitably.

  The support member 27 includes a block-shaped support member main body 62 extending along the longitudinal direction of the housing 18, and a cam 64 that holds the support member main body 62 with respect to the housing 18. A lower surface of the support member main body 62 facing the lower wall 32 protrudes downward in an arc shape. The lower part of the base end face of the support member main body 62 is inclined downward in the distal direction (see FIG. 3B).

  A second support groove 66 having a semicircular cross-sectional shape in which the catheter 12 is disposed is provided on the lower surface of the support member main body 62 from the distal end to the base end surface of the support member main body 62 along the longitudinal direction. It is formed so as to face. A second recess 68 having a semicircular cross-sectional shape is formed at the center in the longitudinal direction of the inner surface of the second support groove 66. Thereby, the sliding resistance between the outer surface of the catheter 12 and the inner surface of the second support groove 66 can be suitably suppressed.

  The cross-sectional shape of the second support groove 66 and the second recess 68 is not limited to a semicircular shape, and may be an arc shape other than the semicircular shape. Further, in the catheter assembly 10A, the second support groove 66 and the second recess 68 may not be provided. In this case, the catheter 12 contacts the lower surface of the support member main body 62.

  The catheter 12 is slidably disposed in a space formed by the first support groove 38 of the housing 18 and the second support groove 66 of the support member main body 62 (see FIG. 4). That is, the catheter 12 is supported between the housing 18 and the support member main body 62 by slidably contacting both the inner surface of the first support groove 38 and the inner surface of the second support groove 66.

  Convex portions 70a and 70b to be inserted into the notches 42a and 42b are provided on the side surfaces of the support member main body 62 facing the first side walls 34a and 34b. By inserting the convex portions 70a and 70b into the notches 42a and 42b, the displacement of the support member main body 62 in the proximal direction relative to the housing 18 and the displacement in the vertical direction are restricted. Thereby, since the support member main body 62 is firmly held with respect to the housing 18, the catheter 12 can be supported more stably by the support member main body 62.

  In the catheter assembly 10A, at least one of the pair of convex portions 70a and 70b may not be provided. In this case, the cutout portions 42a and 42b corresponding to the convex portions 70a and 70b may not be provided. Even in such a configuration, the support member main body 62 can be held with respect to the housing 18 by the cam 64.

  As shown in FIGS. 3B to 5A, the support member main body 62 has an insertion hole 72 through which the flat plate portion 46 of the catheter operation member 20 is inserted, a first arrangement hole 74 that communicates with the insertion hole 72, and a first arrangement. A second disposition hole 76 that communicates with the installation hole 74 and opens on the side surface of the support member main body 62 is formed. The insertion hole 72 extends along the longitudinal direction from the distal end surface to the proximal end surface of the support member main body 62, and opens at the upper surface of the support member main body 62 at the distal end portion of the support member main body 62. Thereby, a part of the operation portion 48 of the catheter operation member 20 can be disposed in the insertion hole 72 in the initial state.

  The first arrangement hole 74 and the second arrangement hole 76 form one arrangement hole 78 in which the cam 64 is arranged. The first arrangement hole 74 extends from the substantially longitudinal center of the support member main body 62 to the base end surface. The second arrangement hole 76 opens in a rectangular shape on the side surface of the support member main body 62, and communicates with the fitting hole 44 in a state where the support member main body 62 is mounted on the housing 18. In the longitudinal direction of the support member main body 62, the second arrangement hole 76 is formed shorter than the first arrangement hole 74 and longer than the fitting hole 44.

  In addition, a pair of through holes 80 a and 80 b penetrating along the longitudinal direction are spaced apart from each other in the width direction of the support member body 62 (width direction of the housing 18) above the insertion hole 72 in the support member body 62. Is formed.

  The cam 64 is arranged in the arrangement hole 78 so as to be displaceable between a first position where the cam 64 is fitted into the fitting hole 44 and a second position where the cam 64 is detached from the fitting hole 44. When the cam 64 is fitted into the fitting hole 44, the supporting member main body 62 is held with respect to the housing 18.

  The cam 64 is a T-shaped flat plate member, and includes a stopper portion 82 disposed in the first disposition hole 74 and a protruding portion 84 projecting from the stopper portion 82 toward the second disposition hole 76. Have. In the longitudinal direction of the support member main body 62, the stopper portion 82 is formed longer than the second arrangement hole 76. Thereby, even when the support member main body 62 is detached from the housing 18, the cam 64 is prevented (prevented) from coming out of the arrangement hole 78.

  A second inclined surface 86 that is inclined toward the protruding portion 84 toward the distal end side of the catheter 12 is formed on the surface of the stopper portion 82 that faces the flat plate portion 46. The inclination angle of the second inclined surface 86 is set to be the same as the inclination angle of the first inclined surface 56 of the flat plate portion 46.

  A guide surface 88 that is inclined in the proximal direction of the catheter 12 toward the opposite side of the flat plate portion 46 is formed on the surface of the protruding portion 84 that faces the distal direction of the catheter 12. That is, since the tip end portion of the projecting portion 84 is gradually narrowed toward the tip end, it can be fitted (inserted) into the fitting portion.

  As shown in FIG. 5A, in the state where the wide portion 52 is positioned in the insertion hole 72, the cam 64 is configured such that the protruding portion 84 is fitted into the fitting hole 44 when the stopper portion 82 contacts the wide portion 52. Held in one position. That is, the support member main body 62 is in a locked state that maintains the support of the catheter 12. Accordingly, when the catheter operating member 20 is displaced to the distal end side with respect to the housing 18 and the distal end portion of the catheter 12 is inserted into the blood vessel, the support member main body 62 is removed from the housing 18 even if a resistance force acts on the catheter 12. Separation can be suppressed.

  In the locked state in which the cam 64 is held at the first position, the guide surface 88 comes into contact with the boundary portion (corner portion 90) between the wall surface forming the fitting hole 44 and the inner surfaces of the first side walls 34a and 34b. Yes.

  On the other hand, as shown in FIG. 5B, in the state where the narrow portion 54 is located in the insertion hole 72, the contact between the stopper portion 82 and the wide portion 52 is released, so that the cam 64 is fitted into the fitting hole from the first position. It can be displaced to the second position separated from 44. That is, the support member main body 62 is in an unlocked state in which it can be detached from the housing 18 (allowing the catheter hub 14 to be detached from the housing 18).

  Accordingly, when the catheter operating member 20 and the catheter member 17 are displaced in the distal direction relative to the housing 18 in the unlocked state, the support member 27 (the support member main body 62 and the cam 64) is moved in the distal direction. When the guide surface 88 is pushed to the narrow portion 54 side by the corner portion 90, the cam 64 is displaced from the first position to the second position and is detached from the fitting hole 44. In the second position, the stopper portion 82 of the cam 64 is in contact with the narrow portion 54. Then, the support member 27 is detached from the housing 18 by displacing the catheter operation member 20 and the catheter member 17 relative to the housing 18 in the distal direction.

  Next, the operation and effect of the catheter assembly 10A configured as described above will be described.

  In the initial state of the catheter assembly 10A shown in FIG. 1, the catheter hub 14, the auxiliary member hub 24, and the needle protection member 26 are connected, and the catheter hub 14 is mounted on the hub mounting portion 50 of the catheter operation member 20, The housing 18 is integrally provided.

  In the initial state, the multiple tube portion in which the catheter 12, the auxiliary member 22, and the inner needle 16 are concentrically overlapped is supported by the support member 27. Specifically, the catheter 12 is disposed in a space formed by the first support groove 38 of the housing 18 and the second support groove 66 of the support member 27, thereby contacting both the housing 18 and the support member 27. Supported by the state. At this time, since the wide portion 52 of the catheter operating member 20 is located in the insertion hole 72 of the support member main body 62, the cam 64 is held at the first position where the cam 64 is fitted into the fitting hole 44. That is, the support member main body 62 is in a locked state that maintains the support of the catheter 12.

  When using the catheter assembly 10A, first, a puncturing operation is performed to puncture the skin of the patient with the catheter assembly 10A. In the puncture operation, the user (doctor, nurse, etc.) presses the distal end portion of the catheter assembly 10A (the distal end portion of the catheter 12 through which the inner needle 16 is inserted) against the patient while holding the housing 18. The skin is punctured toward the target blood vessel. As a result, the inner needle 16 and the distal end portion of the catheter 12 are punctured into the skin. At the time of this puncture, as described above, the catheter 12 is supported by the support member 27, so that even if a resistance force associated with the puncture is received, the bending of the multiple tube portion in the housing 18 is suppressed. Thereby, the user can puncture without a sense of incongruity.

  Next, as shown in FIG. 6A, the user advances the catheter member 17 (the catheter 12 and the catheter hub 14) by operating the catheter operation member 20 in the distal direction while fixing the position of the housing 18. In this case, for example, the user applies a finger to the operation unit 48 of the catheter operation member 20 to advance the catheter operation member 20 in the distal direction relative to the housing 18. In FIG. 6A, the catheter operating member 20 remains linear, but in actuality, the flat plate portion 46 of the catheter operating member 20 is curved upward so that the catheter operating member 20 does not contact the patient's skin. The operation member 20 is advanced.

  At this time, as described above, the support member main body 62 is in a locked state that maintains the support of the catheter 12, so that the catheter 12, the inner needle 16, etc. It is possible to suppress bending of the multiple tube portion. Thereby, the catheter 12 can be smoothly inserted into the blood vessel without a sense of incongruity.

  At this time, the catheter operating member 20 may be advanced or retracted with respect to the housing 18 depending on the preference of the user. Even in such a case, since the support of the catheter 12 is maintained by the support member main body 62, it is possible to suppress bending of the multiple tube portion.

  When the distal end of the catheter 12 is inserted to a predetermined position in the blood vessel, the narrow portion 54 of the catheter operating member 20 is positioned in the insertion hole 72 of the support member main body 62. In this state, since the contact between the stopper portion 82 and the wide portion 52 is released, the cam 64 can be displaced from the first position to the second position. That is, the support member main body 62 is in an unlocked state that can be detached from the housing 18.

  Next, the user pulls the housing 18 in the proximal direction while maintaining the positions of the catheter operation member 20 and the catheter member 17. Then, the housing 18 is displaced in the proximal direction relative to the support member 27, and the guide surface 88 is pushed toward the narrow portion 54 by the corner portions 90 of the first side walls 34a and 34b, so that the cam 64 is fitted. It separates from the joint hole 44 and is displaced to the second position. In this state, the stopper portion 82 of the cam 64 is in contact with the narrow portion 54. Further, the pair of convex portions 70a and 70b are detached from the notches 42a and 42b.

  Depending on the user's preference, the catheter operation member 20 may be further displaced toward the distal end side with respect to the housing 18 while maintaining the position of the housing 18. Even in this case, since the hub mounting portion 50 contacts the base end surface of the support member main body 62 and pushes the support member main body 62 in the distal direction, the support member 27 is displaced in the distal direction relative to the housing 18. At the same time, when the guide surface 88 is pushed toward the narrow portion 54 by the corner portion 90, the cam 64 is detached from the fitting hole 44 and displaced to the second position.

  When the housing 18 is further pulled in the proximal direction, as shown in FIG. 6B, the support member main body 62 and the cam 64 (support member 27) pushed in the distal direction by the hub mounting portion 50 are detached from the housing 18, and the catheter The member 17 and the catheter operation member 20 are completely removed from the housing 18, and the inner needle 16 fixed to the housing 18 is removed from the catheter 12. At this time, since the stopper portion 82 is formed longer than the second arrangement hole 76 in the longitudinal direction of the support member main body 62, the cam 64 does not come out of the arrangement hole 78.

  Further, the safety function by the needle protection member 26 and the shutter 58 is exhibited. That is, the shutter 58 blocks the needle insertion path in the needle protection member 26 as the needle tip 16 a moves in the needle protection member 26 to the base end side from the shutter 58. Thereby, the re-projection of the inner needle 16 from the tip of the needle protection member 26 is prevented. In addition, the retaining member 60 prevents the inner needle 16 from coming off from the proximal end side of the needle protection member 26, so that the protection of the needle tip 16a by the needle protection member 26 is suitably maintained.

  Further, when the housing 18 is further pulled in the proximal direction from the state of FIG. 6B, the connection between the catheter hub 14 and the needle protection member 26 is released. As a result, the needle protection member 26 is separated from the catheter hub 14 as shown in FIG. 7A. At this time, since the auxiliary member hub 24 and the needle protection member 26 are connected to each other, the auxiliary member hub 24 is pulled in the proximal direction by the needle protection member 26 and the auxiliary member 22 is also removed from the catheter 12.

  Next, the user removes the catheter operation member 20 from the catheter hub 14 as shown in FIG. 7B. As a result, the catheter member 17 is placed in the patient. Note that the catheter operation member 20 may be left attached to the catheter hub 14 depending on the user's preference.

  Next, a connector of an infusion tube (not shown) is connected to the proximal end side (the proximal end portion of the catheter hub 14) of the catheter member 17 in a state where the inner needle 16 and the auxiliary member 22 are removed, and the infusion tube is connected to the patient. Administer an infusion (medical solution).

  In the above description, after the support member 27 is detached from the housing 18, the catheter member 17 and the catheter operation member 20 are detached from the housing 18. However, depending on the user's preference, the support member 27 once detached from the housing 18 may be attached to the housing 18 again, and the catheter 12 may be advanced and retracted relative to the inner needle 16.

  In this case, the user inserts the proximal end of the support member main body 62 from the distal end side of the housing 18 by displacing the housing 18 toward the distal end side while maintaining the positions of the catheter operation member 20 and the catheter member 17. Thereby, each convex part 70a, 70b is inserted in each notch part 42a, 42b, and the 2nd arrangement | positioning hole 76 is connected to the fitting hole 44 (opposite).

  In this state, the catheter operating member 20 is slid in the proximal direction while maintaining the position of the housing 18. Then, when the second inclined surface 86 is pushed toward the fitting hole 44 by the first inclined surface 56, the cam 64 is displaced from the second position to the first position and is fitted into the fitting hole 44. In this state, the wide portion 52 located in the insertion hole 72 and the stopper portion 82 come into contact with each other, so that the cam 64 is held at the first position.

  Note that the mounting operation of the support member 27 to the housing 18 is performed by sliding the catheter operation member 20 and the catheter member 17 in the proximal direction while maintaining the position of the housing 18, so that the proximal end of the support member main body 62 is moved to the housing 18. You may make it insert from the front end side.

  When the support member 27 detached from the housing 18 is mounted on the housing 18 again, the catheter assembly 10A may have a holding means 91 that holds the cam 64 in the second position (see FIG. 8). As the holding means 91, for example, a configuration in which the convex portion 92 provided on the cam 64 is fitted into the concave portion 94 formed on the wall surface constituting the arrangement hole 78 can be adopted.

  Further, the holding means 91 may have a configuration in which a convex portion is provided on the wall surface constituting the arrangement hole 78 and a concave portion is formed in the cam 64, or a convex portion that engages with the wall surface constituting the arrangement hole 78 and the cam 64. The structure which provides may be sufficient. Note that the holding means 91 is set to a holding force such that the holding of the second position of the cam 64 is released when the second inclined surface 86 is pushed toward the fitting hole 44 by the first inclined surface 56. ing. When such holding means 91 is provided, it is suppressed that a part of the cam 64 protrudes from the arrangement hole 78 (the cam 64 becomes an obstacle). Can be inserted into.

  In the above description, when separating the needle protection member 26 from the catheter hub 14, the auxiliary member hub 24 remains connected to the needle protection member 26, and the auxiliary member 22 is removed from the catheter 12. However, depending on the user's preference, when the needle protection member 26 is separated from the catheter hub 14, the needle protection member 26 and the auxiliary member hub 24 are also separated, and the assembly of the auxiliary member 22 and the catheter 12 is placed in the blood vessel. It may be inserted.

  As described above, in this embodiment, the support member 27 is in a locked state in which the support of the catheter 12 is maintained when the catheter 12 advances toward the distal end side with respect to the inner needle 16, and from the housing 18 of the catheter hub 14. It is provided in the housing 18 so as to be switchable to an unlocked state that allows disengagement. Thereby, the catheter 12 can be smoothly inserted into the blood vessel without a sense of incongruity, and the catheter hub 14 can be easily detached from the housing 18.

  In addition, since the user can switch the support member 27 from the locked state to the unlocked state simply by displacing the catheter operating member 20 toward the distal end side of the catheter 12 with respect to the housing 18, the operability of the catheter assembly 10A can be improved. Can be improved. Further, since the displacement of the support member 27 with respect to the housing 18 is restricted in the locked state, the multiple tube portions such as the catheter 12 and the inner needle 16 can be stably supported by the support member 27.

  Furthermore, since the support member 27 is detached from the housing 18 when the catheter operating member 20 is displaced relative to the distal end side of the catheter 12 with respect to the housing 18 in the unlocked state, the catheter hub 14 and the catheter operating member 20 are removed. Can be easily detached from the housing 18.

  According to this embodiment, while the wide portion 52 is positioned in the insertion hole 72, the cam 64 is held at the first position where it is fitted into the fitting hole 44, and the support member 27 is in the locked state. The catheter 12 can be stably supported by the member main body 62. In addition, the cam operating member 20 is displaced relative to the distal end side of the catheter 12 with respect to the housing 18 so that the narrow portion 54 is positioned in the insertion hole 72, whereby the cam 64 is moved from the fitting hole 44 from the first position. The support member 27 can be displaced to the second position where it is detached, and the support member 27 is unlocked. Therefore, the support member 27 can be switched between the locked state and the unlocked state with a simple configuration. Furthermore, the cam 64 can be easily displaced from the first position to the second position by the action of the guide surface 88 formed on the cam 64.

  According to the present embodiment, since the cam 64 can be prevented from being separated from the arrangement hole 78 by the stopper portion 82, the operability of the catheter assembly 10A can be improved.

(Second Embodiment)
Next, a catheter assembly 10B according to a second embodiment of the present invention will be described with reference to FIGS. 9 to 13B. Note that in the catheter assembly 10B according to the second embodiment, the same components as those of the catheter assembly 10A according to the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIGS. 9 and 10, the catheter assembly 10B according to this embodiment includes a catheter 12, a catheter hub 14, an inner needle 16, a housing 100, a catheter operation member 102, an auxiliary member 22, an auxiliary member hub 24, and a needle. A protection member 26 and a support member 104 are provided.

  The housing 100 is made of the same material as the housing 18 described in the first embodiment, and includes a lower wall 106, a pair of side walls 108 a and 108 b that protrude upward from the side of the lower wall 106, and the lower wall 106. A needle holding part 110 that protrudes upward from the upper surface and fixes and supports the proximal end part of the inner needle 16 is provided.

  On the inner side surrounded by the lower wall 106 and the pair of side walls 108a and 108b, an accommodation space 112 for accommodating a part of the multiple tube portion, the catheter hub 14, the auxiliary member hub 24, and the needle protection member 26 is formed.

  The pair of side walls 108a and 108b extend in parallel with the lower wall 106 in the longitudinal direction, and the vertical width on the base end side and the intermediate side is constant, and the vertical width on the distal end side is wider than the intermediate side. ing. A groove-like rail portion 114 is provided at the top end of each of the side walls 108a and 108b. The groove-shaped rail portion 114 is formed by cutting the inner surfaces of the side walls 108a and 108b linearly. The rail part 114 accommodates the left and right side edges of the catheter operation member 102 and guides the advancement and retraction of the catheter operation member 102. One side wall 108 a is provided with a placement recess 116 for attaching the support member 104.

  The placement recess 116 is notched from the distal end of the side wall 108a toward the proximal end, and is positioned between the lower wall 106 and the rail portion 114. A pair of upper and lower support holes 118 to which the support member 104 is rotatably attached are provided on the lower wall 106 and the side wall 108a where the arrangement recess 116 is formed. At a position overlapping the rail portion 114 (between the upper support hole portion 118 and the placement recess portion 116), a window 120 for receiving a cam projection portion 152 of the support member 104 described later is provided (see FIG. 12B). . The lower wall 106 is formed with a locking recess 122 into which the locking protrusion 164 is inserted when the support main body 148 of the support member 104 is moved to the open position (position in FIG. 13B).

  The catheter operating member 102 is made of the same material as the catheter operating member 20 described in the first embodiment. The catheter operating member 102 directly holds the catheter 12 and is attached to the catheter hub 14, so that the inner needle 16 and the housing 100 can be attached. The catheter 12 and the catheter hub 14 are relatively advanced and retracted. Specifically, the catheter operation member 102 includes an operation plate portion 124 extending in the distal and proximal directions, and a hub attachment portion 125 that is integrally formed at the proximal end of the operation plate portion 124 and is detachably attached to the catheter hub 14. Have

  The catheter operation member 102 includes a wide portion (cam holding portion) 126 that is provided on the operation plate portion 124 and extends with a constant width dimension, and a narrow portion that is provided on the hub mounting portion 125 and has a constant width dimension. (Cam holding release portion) 128. A step 130 is formed at the boundary between the wide portion 126 and the narrow portion 128.

  The operation plate portion 124 is a portion where the user's finger is touched and the catheter 12 is advanced and retracted. The left and right side edges extending along the longitudinal direction of the operation plate portion 124 are disposed on the upper surfaces of the pair of side walls 108 a and 108 b and the pair of rail portions 114. The operation plate portion 124 is flexible enough to be easily bent in a direction perpendicular to the surface direction of the operation plate portion 124 by being formed thin enough.

  As shown in FIGS. 9 to 11, an upper rib 132 and tabs 134 and 136 are provided on the upper surface of the operation plate portion 124, and a tip warp portion 138 is provided at the tip of the operation plate portion 124. A holding portion 140 and a lower rib 142 are provided on the lower surface of the portion 124. A plurality of upper ribs 132 and lower ribs 142 are provided along the longitudinal direction of the operation plate portion 124. The upper rib 132 and the lower rib 142 protrude in the vertical direction and extend linearly along the width direction of the operation plate portion 124, thereby increasing the strength in the width direction of the operation plate portion 124. As a result, the operation plate portion 124 is prevented from being bent or bent in the housing 100 even when an external force is applied from the outside, and smoothly advances and retreats along the upper surfaces of the pair of side walls 108a and 108b and the rail portion 114.

  The tabs 134 and 136 are portions that are assumed to be directly applied by the user's finger, and protrude higher than the upper rib 132. The number of installed tabs 134 and 136 is not limited to two as shown in FIG. 9 and may be one or three or more.

  As shown in FIG. 11, the holding | maintenance part 140 hold | maintains the said multiple tube part containing the catheter 12 so that separation | detachment is possible. Note that FIG. 11 shows only components necessary for the description. The holding unit 140 includes a plurality of sets (five sets in the illustrated example) of protrusions 144 in the longitudinal direction of the operation plate unit 124 on the left and right. Each protrusion 144 protrudes downward from the lower surface of the operation plate portion 124. The five sets of projecting pieces 144 are provided at equal intervals along the longitudinal direction of the operation plate portion 124 and are held in contact with the catheter 12 at each location. Note that the holding unit 140 may be provided with only one set of protruding pieces 144. Or the holding | maintenance part 140 does not need to be provided.

  As shown in FIGS. 12A and 12B, the support member 104 includes a cylindrical shaft rod portion 146 and a support main body portion 148 that protrudes laterally from the shaft rod portion 146 (in a direction perpendicular to the axis of the shaft rod portion 146). And have. The shaft bar portion 146 extends short in the vertical direction, and the upper end portion and the lower end portion thereof are respectively inserted into the pair of upper and lower support hole portions 118 of the placement recess 116. The support member 104 is rotatably assembled to the housing 100 with the shaft rod portion 146 as a base point.

  On the lower side of the shaft bar portion 146, a connection reinforcing portion 150 corresponding to the vertical width of the arrangement recess 116 is bulged and formed in the assembled state of the housing 100 of the support member 104. The support main body 148 is connected to the connection reinforcing portion 150. A pair of cam projections 152 are integrally formed on the upper side of the shaft bar portion 146. The pair of cam projections 152 are provided at predetermined positions (positions accommodated in the window 120 when the housing 100 is assembled), and protrude in opposite directions and to the same extent with the shaft rod portion 146 interposed therebetween.

  The support member 104 has an operation member groove portion 154 at a position facing the support main body portion 148 of the shaft rod portion 146 and the pair of cam convex portions 152. In the initial state shown in FIG. 9, the operating member groove 154 extends linearly from the most distal end of the cam convex portion 152 on the distal end side to the most proximal end of the cam convex portion 152 on the proximal end side. The operation member groove portion 154 is disposed at a position corresponding to the rail portion 114 and slidably accommodates the side edge of the catheter operation member 102 together with the rail portion 114.

  On the other hand, the support main body portion 148 of the support member 104 is a portion that moves by rotation with the shaft rod portion 146 as a base point in the assembled state of the housing 100. Specifically, the support main body 148 is positioned in the housing space 112 and can be contacted and supported by the catheter 12 (see FIG. 13A), and is different from the closed position in the housing 100 and in the arrangement recess 116. Then, the catheter 12 is displaced to the open position (see FIG. 13B) where it does not contact the catheter 12. The angle between the closed position and the open position with the shaft rod portion 146 as the axis is preferably 90 ° or more so that the catheter hub 14, the auxiliary member hub 24 and the needle protection member 26 can be easily removed. In the present embodiment, the angle is set to 90 ° so that the cam convex portion 152 is positioned in the rail portion 114 in the open position.

  The support main body 148 is formed in an S shape having a size that substantially matches the vertical width of the placement recess 116 when viewed from the front, and has a spring force that can be elastically deformed in the vertical direction. On the upper surface of the support main body 148, a raised portion 156 that slightly rises upward is provided. The raised portion 156 contacts and supports the catheter 12 (multiple tube portion) held by the catheter operation member 102 from below at the closed position of the support main body portion 148.

  Further, a tip inclined surface 158 that is inclined in the distal direction and downward is formed on the upper distal end side of the support main body portion 148, and a proximal end that is inclined downward in the proximal direction on the upper proximal end side of the support main body portion 148. An inclined surface 160 is formed. Furthermore, a wing 162 that projects in an inclined manner toward the outside in the width direction and away from the shaft bar portion 146 is integrally formed at the end portion of the support main body portion 148 that is continuous with the raised portion 156.

  A locking projection 164 is formed on the lower surface of the support body 148 so as to protrude downward. The locking projection 164 is inserted into the locking recess 122 of the housing 100 at the open position of the support body 148. In addition, a contact protrusion 166 that protrudes in the proximal direction is provided at the lower end of the support body 148. The contact protrusion 166 contacts the hub mounting portion 125 when the catheter operation member 102 advances, and induces displacement of the support main body portion 148 from the closed position to an open position 90 ° apart.

  The material which comprises the supporting member 104 is not specifically limited, For example, the material quoted by the catheter hub 14 can be selected suitably. The support member 104 is not only provided separately from the housing 100 but may be integrally formed with the housing 100. Further, the support member 104 is not provided only on the one side wall 108a of the housing 100, but may be provided on the other side wall 108b, or may be provided in a pair on both the side walls 108a and 108b. Further, the rotation direction of the support main body 148 is not limited to the planar direction of the housing 100, and may be a side surface direction including upper and lower sides.

  Next, the operation and effect of the catheter assembly 10B configured as described above will be described. Since the usage method of the catheter assembly 10B according to the present embodiment is basically the same as the usage method of the catheter assembly 10A according to the first embodiment described above, detailed description thereof will be omitted.

  In the initial state of the catheter assembly 10B of this embodiment, the support main body 148 of the support member 104 assembled to the distal end portion of the housing 100 stands by in the closed position, and as shown in FIGS. 9 and 13A, the catheter operation member The multiple tube portions held by the plurality of holding portions 140 are contact-supported by the support main body portion 148. At this time, since the wide portion 126 of the catheter operation member 102 is located in the operation member groove portion 154, the rotation of the cam convex portion 152 is restricted. That is, the support main body 148 is in a locked state that maintains the support of the catheter 12. Moreover, each holding | maintenance part 140 hold | maintains the outer peripheral surface of the catheter 12 with the weak engagement force in each location of an axial direction, and hold | maintains the catheter 12 firmly as a whole.

  When the catheter assembly 10B is punctured, the support member 104 supports the catheter 12 and the holding portion 140 holds the catheter 12, so that the multiple tube portion in the housing 100 can be received even when a resistance force due to the puncture is received. Is prevented from bending. Thereby, the user can puncture without a sense of incongruity. In addition, the catheter assembly 10B can be formed to be thinner by reducing the strength of the inner needle 16, thereby reducing the burden on the patient.

  In the advancement operation of the catheter 12, the user fixes the position of the housing 100 while placing a finger on the upper rib 132 and the tabs 134 and 136 of the catheter operation member 102 so that the catheter operation member 102 is moved in the distal direction with respect to the housing 100. Advance (relative movement). In the catheter assembly 10B, the holding of the multiple tube portion by the holding portion 140 continues, and the catheter 12 advances smoothly.

  At this time, as described above, the support main body 148 is in a locked state that maintains the support of the catheter 12, so that the catheter 12, the inner needle 16, etc. It is possible to suppress bending of the multiple tube portion. Thereby, the catheter 12 can be smoothly inserted into the blood vessel without a sense of incongruity.

  Note that the catheter operation member 102 may be advanced and retracted relative to the housing 100 depending on the user's preference. Even in such a case, since the support of the catheter 12 is maintained by the support main body portion 148, it is possible to prevent the multiple tube portion from being bent.

  When the distal end of the catheter 12 is inserted to a predetermined position in the blood vessel, the narrow portion 128 of the catheter operation member 102 is positioned in the operation member groove 154. In this state, the restriction of the rotation of the cam projection 152 is released and the cam main body 148 can be rotated, so that the support main body 148 can be displaced from the closed position to the open position. That is, the support main body 148 is in an unlocked state in which the catheter hub 14 and the catheter operation member 102 can be detached from the housing 100.

  In this state, when the catheter operation member 102 and the catheter member 17 are displaced relative to the distal direction with respect to the housing 100, the hub mounting portion 125 contacts the contact protrusion 166 of the support main body portion 148 and pushes in the distal direction. As a result, the support main body 148 and the cam projection 152 rotate around the shaft bar 146.

  When the support main body 148 rotates by a predetermined rotation angle (90 °), the locking projection 164 of the support main body 148 is inserted into the locking recess 122 of the housing 100, and the support main body 148 is held in the open position. Is done. Thereby, the catheter hub 14 and the catheter operation member 102 can be easily detached from the housing 100.

  In use of the catheter assembly 10B, the catheter operating member 102 detached from the housing 100 may be attached to the housing 100 again and the catheter 12 may be advanced and retracted with respect to the inner needle 16 depending on the user's preference.

  In this case, the user inserts the proximal end of the catheter operation member 102 from the front end side of the housing 100 by displacing the housing 100 relative to the catheter operation member 102 and the catheter member 17 in the distal direction. Then, the side edge of the operation plate portion 124 is inserted into the rail portion 114, and the step 130 of the operation plate portion 124 comes into contact with the cam protrusion portion 152 to push the cam protrusion portion 152 in the proximal direction, thereby locking the protrusion portion 164. Comes out of the locking recess 122.

  Thereby, since the cam convex part 152 and the support main body part 148 rotate around the shaft rod part 146 (the reverse rotation when the catheter 12 is advanced), the support main body part 148 is switched from the open state to the closed state. At this time, since the wing 162 extends obliquely downward, it can be avoided that the wing 162 contacts the catheter 12 and the catheter 12 is displaced laterally during the reverse rotation of the support main body 148. Then, by pulling the catheter operation member 102 in the proximal direction with respect to the housing 100, the catheter 12 is held by the holding unit 140 while being supported by the support main body 148 from below.

  According to the present embodiment, the user can switch the support member 104 from the locked state to the unlocked state only by displacing the catheter operation member 102 toward the distal end side of the catheter 12 with respect to the housing 100. Thereby, the operativity of the catheter assembly 10B can be improved. In addition, since the displacement of the support member 104 with respect to the housing 100 is restricted in the locked state, the multiple tube portions such as the catheter 12 and the inner needle 16 can be stably supported by the support member 104.

  In the present embodiment, the support member 104 is displaced from the closed state to the open state and held by moving the catheter operation member 102 forward with respect to the housing 100. Thereby, since it can suppress that the catheter hub 14 and the support main-body part 148 interfere when separating the catheter hub 14 from the housing 100, the catheter hub 14 can be easily detached from the housing 100.

10A, 10B ... catheter assembly 12 ... catheter 14 ... catheter hub 16 ... inner needle 16a ... needle tip 18, 100 ... housing 20, 102 ... catheter operation member 27, 104 ... support member 52, 126 ... wide part 54, 128 ... Narrow part 62 ... support member main body 64 ... cam 78 ... arrangement hole 82 ... stopper part 88 ... guide surface 91 ... holding means

Claims (10)

A hollow catheter;
A catheter hub secured to the proximal end of the catheter;
A hollow inner needle inserted through the catheter;
A housing that supports the inner needle and in which the catheter hub is disposed in an initial state in which the distal end of the inner needle protrudes from the distal end of the catheter;
A support member for supporting the catheter;
A catheter operating member connected to the catheter hub and displaceable along the longitudinal direction of the housing with respect to the housing ;
The support member can be switched between a locked state for maintaining support of the catheter and an unlocked state for allowing the catheter hub to be detached from the housing when the catheter advances toward the distal end side with respect to the inner needle. Provided in the housing ,
The support member is a catheter assembly, wherein Rukoto switch to the unlock state from the locked state by said catheter operating member is displaced to the tip side of the catheter relative to the housing. A hollow catheter;
A catheter hub secured to the proximal end of the catheter;
A hollow inner needle inserted through the catheter;
A housing that supports the inner needle and in which the catheter hub is disposed in an initial state in which the distal end of the inner needle protrudes from the distal end of the catheter;
A support member for supporting the catheter,
The support member can be switched between a locked state for maintaining support of the catheter and an unlocked state for allowing the catheter hub to be detached from the housing when the catheter advances toward the distal end side with respect to the inner needle. Provided in the housing,
The catheter assembly is characterized in that displacement of the support member with respect to the housing is restricted in the locked state. The catheter assembly of claim 1 .
The catheter assembly is characterized in that the support member is disengaged from the housing in the distal direction when the catheter operation member is displaced relative to the distal end side of the catheter with respect to the housing in the unlocked state. The catheter assembly of claim 3 ,
The support member is
A support member body in contact with the catheter;
A cam that is provided on the support member body and is displaceable between a first position for locking the housing and a second position for unlocking the housing;
The catheter operating member is
A cam holding portion that contacts the cam and holds the cam in the first position to bring the support member into the locked state;
A catheter assembly, comprising: a cam holding release portion that makes the support member unlocked by enabling the cam to be displaced from the first position to the second position. The catheter assembly according to claim 4 .
In the support member body,
An insertion hole through which the catheter operating member is inserted;
An arrangement hole in which the cam is arranged in communication with the insertion hole is formed,
The housing is formed with a fitting hole into which the cam can be fitted,
The cam is held in the first position where the cam is held in the insertion hole when the cam holding portion is positioned in the insertion hole, and the first cam is positioned when the cam holding release portion is positioned in the insertion hole. A catheter assembly that is displaceable from a position to the second position that is detachable from the fitting hole. The catheter assembly according to claim 5 .
A guide surface is formed on the cam to guide the cam from the first position to the second position as the cam is displaced toward the distal end side of the catheter with respect to the housing. Assembly. The catheter assembly according to claim 5 or 6 ,
2. The catheter assembly according to claim 1, wherein the cam has a stopper portion that prevents the cam from coming out of the arrangement hole. The catheter assembly according to any one of claims 4 to 7 ,
A catheter assembly further comprising holding means for releasably holding the cam in the second position. The catheter assembly according to any one of claims 1 to 8 ,
The housing is formed with a notch opening on the distal end side of the catheter,
The catheter assembly, wherein the support member is provided with a convex portion to be inserted into the notch. The catheter assembly according to any one of claims 1 to 9 ,
The catheter assembly, wherein the catheter is supported in contact with both the support member and the housing.

Images