JP7381189B2 - valved needle assembly - Google Patents

Description

The present invention relates to a needle assembly that is punctured into a blood vessel and used for infusion, blood collection, etc., and particularly relates to a needle assembly with a valve that is provided with an elastic valve body and a pusher for pushing open the elastic valve body inside. It is.

2. Description of the Related Art Needle assemblies used for infusion, blood collection, etc. have been known. This needle assembly includes a hollow needle and a needle hub provided on the proximal end side of the hollow needle, and when the hollow needle is punctured into a patient's blood vessel and an external flow path is connected to the needle hub, A fluid flow path is configured that extends from the blood vessel through the interior of the needle assembly to an external flow path, and infusions, blood collection, etc. are performed through the fluid flow path.

By the way, an elastic valve body and a pusher movable in the axial direction are provided on the fluid flow path of the needle assembly, and the elastic valve body is opened and closed by moving the pusher toward the distal end and the proximal end. There is a needle assembly with a valve capable of communicating and blocking a flow path, and such a needle assembly with a valve is proposed in Japanese Patent Laid-Open No. 2008-173206 (Patent Document 1). In particular, in the valved needle assembly described in Patent Document 1, a spring member (coil spring 16) is provided between the needle hub and the pusher, and the spring member is elastically restored when the external flow path is removed. The force causes the pusher to be pushed back to the rear (to the proximal end side).

That is, in Patent Document 1, by pushing the external flow path from the proximal end of the pusher and moving the pusher toward the distal end, the spring member is compressively deformed, and the pusher is inserted into the elastic valve body. the elastic valve body is pushed open. Thereby, the fluid flow path is communicated, and infusion, blood collection, etc. are performed. On the other hand, when the infusion or blood collection ends or is interrupted, the external flow path is removed, and the pusher is pushed back toward the proximal end by the elastic restoring deformation of the spring member, and the elastic valve body is occluded. The fluid flow path is blocked. This prevents blood and the like from leaking when the external flow path is removed.

Japanese Patent Application Publication No. 2008-173206

However, in Patent Document 1, since the pusher is pushed back to the proximal side only by the restoring force of the spring member (coil spring), a larger restoring force is required to more reliably push the pusher back to the proximal side. Met. Therefore, the spring member becomes large, and it is necessary to secure a large space for accommodating the spring member in the valved needle assembly, and the user may feel a large resistance (feeling of repulsion from the spring member) when inserting and connecting the external flow path. This made it difficult for women in particular to use it. In addition, since a large spring force acts locally on the needle hub and pusher, the needle hub and pusher that support the spring member (receiving large spring force) also need to be large, or the needle hub and pusher must be large. In the case where a pusher or pusher is provided, there is a risk that a problem may arise from the viewpoint of strength.

The present invention has been made against the background of the above-mentioned circumstances, and an object of the present invention is to avoid the problem of strength of the spring member and eventually the needle assembly due to the increase in size and the local action of a large spring force. It is an object of the present invention to provide a valved needle assembly having a novel structure, which is capable of handling various functions, and has excellent operability.

A first aspect of the present invention is that an elastic valve body is disposed inside a needle hub provided on the proximal end side of a hollow needle, and a cylindrical pusher pushes open the elastic valve body by moving forward. In the needle assembly with a valve, the outer peripheral surface of the insertion region of the pusher inserted into the elastic valve element when the elastic valve element is pushed open is tapered, and the elasticity of the elastic valve element is reduced. A backward pushing force is applied to the pusher, and a spring member is provided which is deformed by the forward movement of the pusher, and is deformed when the elastic valve body is pushed open. The restoring force of the spring member is exerted on the pusher as a backward return force, and the needle hubs are assembled into an outer circumferential connector and an inner circumferential connector in which the needle hubs are inserted into and out of each other. The proximal end of the inner circumferential connector extends to the proximal end side with a predetermined axial dimension than the outer circumferential connector, and the inner circumferential connector extends in the axial direction of the pusher. The spring member is provided between the inner peripheral connector and the pusher in the radial direction, and the spring member is provided with a tapered outer peripheral surface of the pusher. It is characterized by being externally inserted behind the forming portion of the pusher and disposed inside the maximum outer diameter portion of the pusher in the radial direction of the pusher.

According to the valved needle assembly structured according to this aspect, when the external flow path is removed, the elastic restoring force (pushing back force) of the elastic valve body is applied to the pusher, and the elastic force of the spring member Since a restoring force is exerted on the pusher, the restoring force of the elastic valve body and the restoring force of the spring member work together to return the pusher to the proximal end side. This prevents the pusher from moving toward the proximal end using only the restoring force of the spring member, as in Patent Document 1, and avoids the need for a large restoring force of the spring member. Therefore, it is possible to avoid increasing the size of the spring member and affecting the members supporting the spring member, and also to avoid the possibility that the user may feel a sense of resistance (feeling of repulsion) when inserting and connecting the external flow path. This allows for excellent operability.

In addition, since the insertion region of the pusher is tapered, the elasticity of the elastic valve body is more The restoring force is easily exerted on the pusher as a pushing force back toward the proximal end, and the pusher can be smoothly and stably moved toward the proximal end.

In a second aspect of the present invention, in the valved needle assembly according to the first aspect, an outer circumferential protrusion provided on the outer circumferential surface of the pusher and an inner circumferential protrusion provided on the inner circumferential surface of the needle hub are provided. The end of movement of the pusher toward the proximal end is defined by the mutual contact between the circumferential protrusions and the pusher.

According to the valved needle assembly structured according to this aspect, the pusher is returned to the proximal end side by the elastic restoring force of the elastic valve body and the spring member. Falling off of the pusher from the needle hub due to vigorous restoring deformation can be effectively prevented.

In a third aspect of the present invention, in the valved needle assembly according to the first or second aspect, a front support portion protruding from the inner circumferential surface of the needle hub is provided, while the pusher is A rear support portion protruding from the outer peripheral surface is provided at the axially intermediate portion, and the spring member is disposed between the front support portion and the rear support portion in the axial direction.

According to the valved needle assembly having the structure according to this aspect, it is also possible to avoid disposing a spring member on the outer peripheral side of the tip portion of the pusher, for example. Thereby, the shape of the insertion region inserted into the elastic valve body is not limited by the arrangement of the spring member, and the degree of freedom in designing the shape of the insertion region can be improved.

A fourth aspect of the present invention is the valved needle assembly according to any one of the first to third aspects, wherein the outer peripheral surface of the insertion region of the pusher is a tapered surface. The inclination angle of the tapered surface is set within the range of 1 to 75 degrees.

According to the valved needle assembly structured according to this aspect, the inclination angle of the tapered surface is set within the above range, so that the elastic restoring force of the elastic valve body is applied to the proximal end side of the pusher. It can be effectively exerted as a pushing back force.

A fifth aspect of the present invention is the valved needle assembly according to any one of the first to fourth aspects, wherein the outer peripheral surface of the pusher is provided with a tapered surface, and the pusher is provided with a tapered surface. The tip of the pusher is provided with a penetrating tip that protrudes forward through the elastic valve body when the elastic valve body is pushed open, and the taper includes the outer circumferential surface of the penetrating tip. It has a surface.

According to the valved needle assembly structured according to this aspect, since the outer circumferential surface of the penetrating tip is a tapered surface, even when the pusher moves toward the proximal end, the penetrating tip When the outer circumferential surface of the pusher and the elastic valve body come into contact with each other, a force to push back the pusher toward the proximal end side can be stably exerted on the pusher. Further, in a sixth aspect of the present invention, in the valved needle assembly according to any one of the first to fifth aspects, the inner peripheral connector is arranged on the inner peripheral surface on which the pusher is movably arranged. and the spring member is disposed closer to the outer circumferential surface of the pusher than the inner circumferential surface in the radial direction by being inserted and attached to the pusher. . Furthermore, in a seventh aspect of the present invention, an elastic valve body is disposed inside a needle hub provided on the proximal end side of the hollow needle, and a cylindrical valve body that pushes open the elastic valve body when moved forward. In the needle assembly with a valve provided with a pusher, the outer peripheral surface of an insertion region of the pusher inserted into the elastic valve body when the elastic valve body is pushed open is tapered, and the outer peripheral surface of the insertion region of the pusher is tapered. A backward pushing force due to the elasticity of the body is applied to the pusher, and a spring member that is deformed by the forward movement of the pusher is provided in the middle part of the pusher in a straight shape. The restoring force of the spring member, which is deformed when the elastic valve body is pushed open, is applied to the pusher as a rearward return force. It is characterized by the presence of

According to the valved needle assembly structured according to the present invention, the elastic restoring force of the elastic valve body and the elastic restoring force of the spring member cooperate to return the pusher to the proximal side. , the pusher can be stably moved toward the proximal end. Furthermore, it is possible to set the restoring force of the spring member to be smaller than before, which promotes miniaturization of the spring member and eventually the needle assembly, and also allows the strength of the member supporting the spring member to be set smaller. A valved needle assembly with excellent operability can be provided.

1 is a perspective view showing a valved needle assembly as one embodiment of the present invention in a state before connection of an external flow path; FIG. FIG. 2 is a longitudinal cross-sectional view of the valved needle assembly shown in FIG. 1; FIG. 3 is an enlarged vertical cross-sectional view showing the main parts in FIG. 2; FIG. 2 is a longitudinal sectional view showing the valved needle assembly shown in FIG. 1 in a state where an external flow path is connected; FIG. 5 is an enlarged vertical cross-sectional view showing the main parts in FIG. 4;

Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

1-3, a valved needle assembly 10 is shown in accordance with one embodiment of the present invention. This valved needle assembly 10 is equipped with a cannula 12 as a hollow needle on the distal end side, and a needle hub in which a disk valve 14 as an elastic valve body is housed and disposed on the proximal end side of the cannula 12. It is equipped with 16. An internal flow path 18 is configured including the inside of these cannula 12 and needle hub 16. By percutaneously inserting and indwelling the cannula 12 into a patient's blood vessel, infusion and blood collection are performed through the internal channel 18, and the external channel is connected to the needle hub 16. With the removal, the disc valve 14 is opened and closed, that is, the internal flow path 18 is opened and closed. In the following description, the axial direction refers to the central axis direction of each member, which approximately corresponds to the needle axis direction of the cannula 12, which is a hollow needle, and refers to the left-right direction in FIG. 2, which is the length direction. . Further, the distal end side refers to the left side in FIG. 2, which is the side where the cannula 12 is punctured, and the proximal end side refers to the right side in FIG. 2, which is the side where the user operates.

More specifically, in this embodiment, the cannula 12 is made of soft synthetic resin, and the outer circumferential surface of the distal end portion is a tapered outer circumferential surface 20 whose outer diameter gradually decreases toward the distal end. ing. Further, a plurality of through holes 22 are formed in the peripheral wall of the distal end portion of the cannula 12, and blood and the like can easily flow into the cannula 12 through the through holes 22. Note that the material of the cannula 12 is not limited to soft synthetic resin, and may be made of metal, for example.

A proximal end portion of the cannula 12 is fixedly supported by a needle hub 16. The needle hub 16 of this embodiment includes a needle hub main body 24 to which the proximal end portion of the cannula 12 is directly fixed, an elastic tube 26 connected to the proximal end side of the needle hub main body 24, and a base of the elastic tube 26. It is configured to include a connection connector 28 connected to the end side. That is, in the needle hub 16 of this embodiment, the needle hub body 24, the elastic tube 26, and the connection connector 28 are connected in series in the axial direction.

The needle hub body 24 includes a substantially cylindrical peripheral wall 30, and is made of, for example, hard synthetic resin. Then, the cannula 12 is inserted through the needle hub body 24, and the proximal end portion of the cannula 12 is fixed to the needle hub body 24 by adhesion, welding, etc., so that the cannula 12 extends from the needle hub body 24 toward the distal end. It's out.

An elastic tube 26 is connected to the proximal end side of the needle hub body 24. The elastic tube 26 is made of, for example, a soft synthetic resin, and the distal end portion of the elastic tube 26 is sandwiched between the peripheral wall 30 of the needle hub body 24 and the cannula 12 at the proximal opening of the needle hub body 24. An elastic tube 26 is connected to the proximal end side of the needle hub body 24 by adhesion or welding as necessary. Thereby, the cannula 12 and the elastic tube 26 are firmly fixed to the needle hub body 24.

The proximal end portion of the elastic tube 26 is fixed to the distal end portion of the connection connector 28. The connector 28 has a generally cylindrical shape as a whole, and the proximal end portion of the elastic tube 26 is inserted through the opening on the distal end side of the connector 28, and is subjected to adhesion or welding as necessary. As a result, the elastic tube 26 and the connection connector 28 are connected to each other. That is, the distal end portion of the connector 28 serves as a tube connection portion 32 to which the elastic tube 26 is connected.

An internal flow path 18 leading from the cannula 12 to the connector 28 includes the inner holes of the cannula 12, the elastic tube 26, and the connector 28 (particularly the pusher 100, which will be described later, provided inside the connector 28). is configured.

The connector 28 of this embodiment has a shape in which an outer circumferential connector 34 and an inner circumferential connector 36, both of which have a substantially cylindrical shape, are inserted and fixed into each other. That is, by inserting the distal end side of the inner circumferential connector 36 into the proximal end side of the outer circumferential connector 34 and assembling it, the outer circumferential connector 34 is fixed in an externally inserted state on the outer circumferential side of the inner circumferential connector 36, and the connecting connector 28 are configured. Therefore, the circumferential wall of the connecting connector 28 is composed of the circumferential wall 38 of the outer circumferential connector 34 and the circumferential wall 40 of the inner circumferential connector 36. Further, in the peripheral wall 40 of the inner circumferential connector 36 , the distal end side portion to be inserted into the outer circumferential connector 34 is a substantially cylindrical insertion portion 42 . The proximal end portion into which the insertion portion 42 is inserted is a substantially cylindrical inserted portion 44 . Note that the insertion portion 42 and the inserted portion 44 may be provided oppositely to each other, and the proximal end portion of the inner circumferential connector 36 may be inserted into the outer circumferential connector 34 located on the proximal end side.

The proximal end of the inner circumferential connector 36 extends further toward the proximal end than the outer circumferential connector 34 by a predetermined axial dimension. Therefore, the circumferential wall of the connecting connector 28 has a double wall structure at the inner and outer insertion portions of the insertion portion 42 and the inserted portion 44, which are the connecting portions of the outer circumferential connector 34 and the inner circumferential connector 36. The peripheral wall on the distal end side of the connection connector 28 is constituted by the peripheral wall 38 of the outer peripheral connector 34, and the peripheral wall on the base end side of the connecting connector 28 is constituted by the peripheral wall 40 of the inner peripheral connector 36. That is, the proximal end portion 46a of the inner circumferential surface 46 of the outer circumferential connector 34 (the inner circumferential surface of the inserted portion 44) and the distal end portion 48a of the outer circumferential surface 48 of the inner circumferential connector 36 (the outer circumferential surface of the insertion portion 42) are mutually connected. By overlapping, the outer circumferential connector 34 and the inner circumferential connector 36 are inserted into each other to form a double wall structure.

The outer peripheral connector 34 is made of hard synthetic resin and includes a substantially cylindrical peripheral wall 38. An annular wall portion 50 is formed on the inner circumferential surface 46 at the axially intermediate portion of the circumferential wall 38 so as to protrude toward the inner circumferential side. The proximal end of the elastic tube 26 inserted from the distal opening of the outer peripheral connector 34 is in contact with the distal end surface of the annular wall 50 that extends in the direction perpendicular to the axis. The distal end portion of the tube connecting portion 32 to which the elastic tube 26 is connected is configured. Further, the proximal end surface of the annular wall portion 50 widens in the direction perpendicular to the axis, so that an annular stepped surface 52 is formed on the inner circumferential surface 46 of the outer circumferential connector 34 .

In the outer peripheral connector 34, the inner diameter of the tube connecting portion 32 on the distal end side is substantially constant over substantially the entire length in the axial direction. Further, the inner diameter of the inserted portion 44 on the proximal end side is slightly larger than that of the tube connecting portion 32, and is substantially constant over substantially the entire length in the axial direction. In the present embodiment, on the inner circumferential surface 46 of the outer circumferential connector 34, the distal end portion of the inserted portion 44, that is, the portion adjacent to the annular wall portion 50 on the proximal side, is provided with a pressing force protruding toward the inner circumferential side. A rib 54 is formed over the entire length in the circumferential direction or partially on the circumference.

Furthermore, in the inserted portion 44 of the peripheral wall 38 of the outer peripheral connector 34, on both sides in one radial direction (both sides in the vertical direction in FIG. 2), there is a pair of engagement fittings that penetrate the peripheral wall 38 in the thickness direction (radial direction). Holes 56, 56 are formed. These engagement holes 56, 56 each have a substantially rectangular shape in plan view, and are formed with a circumferential dimension of less than 1/2 circumference. Further, in the circumferential wall 38 of the outer circumferential connector 34, at a position circumferentially away from the pair of engagement holes 56, 56, there is a hole extending from the opening edge of the proximal opening 58 inward in the axial direction (distal side). An extending notch 60 is formed. In this embodiment, a pair of notches 60, 60 are formed with a predetermined width dimension on both sides of the pair of engagement holes 56, 56 in a direction perpendicular to the direction in which they face each other (on both sides in the front and back direction of the paper in FIG. 2). ing. Note that the number of such notches 60 is not limited to two (a pair), and one, three or more may be provided on the circumference.

Furthermore, in the inner circumferential surface 46 of the inserted portion 44 of the outer peripheral connector 34, a pair of inclined surfaces 62, 62 are formed in the proximal opening 58. These inclined surfaces 62, 62 are formed in the same direction as the opposing direction of the engagement holes 56, 56 (on both sides in the vertical direction in FIG. 2), and are formed in the thickness of the peripheral wall 38 toward the proximal opening 58. Dimensions are gradually decreasing. Due to the inclined surfaces 62, 62 and the walls on both circumferential sides of the inclined surfaces 62, 62, the proximal opening 58 of the outer connector 34 has a pair of inclined grooves 64 that open toward the inner circumference. 64 is formed. Note that the widthwise dimensions of the inclined surfaces 62, 62 are approximately equal to the widthwise dimensions of the engagement holes 56, 56, and the engagement holes 56, 56 and the inclined grooves 64, 64 are connected to the peripheral wall of the outer peripheral connector 34. At 38, it is partially formed on the circumference at a corresponding position on the circumference. That is, engagement holes 56, 56 are formed at the tip sides of the inclined grooves 64, 64.

On the other hand, the inner circumferential connector 36 is made of hard synthetic resin and includes a circumferential wall 40 having a smaller diameter than the circumferential wall 38 of the outer circumferential connector 34 . The peripheral wall 40 has an inner diameter and an outer diameter that are substantially constant over substantially the entire length in the axial direction.

That is, on the inner circumferential surface 66 of the inner circumferential connector 36 (peripheral wall 40), an engaging protrusion 68 as an annular inner circumferential protrusion is formed in an axially intermediate portion thereof to protrude toward the inner circumferential side. In the inner circumferential surface 66 of the inner circumferential connector 36, the distal end side of the engaging protrusion 68 is a guide surface 70 that guides the axial movement of the pusher 100, which will be described later, and the inner diameter dimension is approximately constant. It is said that On the other hand, on the proximal side of the engagement protrusion 68, there is a tapered surface 72 whose inner diameter gradually increases toward the proximal side.

Further, the tip portion 48a of the outer circumferential surface 48 of the inner circumferential connector 36, that is, the outer circumferential surface 48a of the insertion portion 42, has a smaller outer diameter at its most distal end. A substantially cylindrical support tube portion 74 is formed that protrudes toward the distal end side.

Furthermore, the outer circumferential surface 48a of the insertion portion 42 is provided with an engaging protrusion 76 that protrudes toward the outer circumferential side. In this embodiment, a pair of engagement protrusions 76, 76 are formed on both sides in one radial direction (both sides in the vertical direction in FIG. 2). The shape of these engaging protrusions 76, 76 in plan view is a substantially rectangular shape that substantially corresponds to the engaging holes 56, 56 in the outer peripheral connector 34. The distal end surfaces of the engaging protrusions 76, 76 are sloped surfaces 78, 78 in which the protruding height of the engaging protrusions 76, 76 gradually decreases toward the distal end, while the proximal end surfaces are These are vertical surfaces 80, 80 that extend in a direction substantially perpendicular to the axis. Note that the direction of inclination of the inclined surfaces 78, 78 in the engagement protrusions 76, 76 with respect to the axial direction is made equal to the direction of inclination of the inclined surfaces 62, 62 in the inclined grooves 64, 64 with respect to the axial direction. In this embodiment, the inclination angles of both of these inclined surfaces 62 and 78 with respect to the axial direction are also approximately equal, and the inclined surfaces 62 and 78 are substantially parallel to each other in the axial direction. The number of such engagement protrusions 76 and engagement holes 56 is not limited to two (one pair), and one or three or more may be provided on the circumference.

Furthermore, on the outer circumferential surface 48a of the insertion portion 42, on both sides of the direction perpendicular to the direction in which the pair of engagement protrusions 76, 76 face each other (both sides in the front and back direction of the paper in FIG. 2), there are cutouts in the outer circumferential connector 34. A pair of positioning protrusions 82, 82 having shapes substantially corresponding to those of 60, 60 are formed to protrude.

In the inner peripheral connector 36, the proximal end of the insertion section 42 extends substantially straight with an outer diameter that is approximately equal to or slightly smaller than the insertion section 42, and the proximal end opening 84 has an outer diameter. A substantially annular flange portion 86 that protrudes to the side is formed. A male thread is formed on the outer peripheral surface of the flange portion 86, and it is possible to connect a Luer lock type external flow path when connecting an external flow path (syringe 124), which will be described later. Further, in this embodiment, a positioning groove 88 extending in the axial direction is formed in a part of the circumference of the flange portion 86 (upper part in FIG. 2). With this, for example, when the valved needle assembly 10 of the present embodiment is used as an outer needle unit and an indwelling needle assembly in combination with an inner needle unit (not shown), the distal side from the inner needle hub constituting the inner needle unit By inserting the positioning convex portion projecting into the positioning groove 88, relative rotation between the inner needle unit and the outer needle unit (the valved needle assembly 10) is prevented.

Here, inside the connection connector 28, the disk valve 14 is accommodated between the outer circumferential connector 34 and the inner circumferential connector 36. The disc valve 14 has a substantially disc shape and is made of an elastic material such as rubber or elastomer. A slit 92 is formed in the central portion 90 of the disc valve 14, passing through it in the axial direction. Although the shape of the slits 92 is not limited, in this embodiment, the slits 92 have a radial shape that extends approximately equally (every 120 degrees) in three directions in the circumferential direction.

In addition, when the disc valve 14 is in a stand-alone state before being assembled to the connecting connector 28, the outer diameter of the disc valve 14 is larger than the inner diameter of the outer peripheral connector 34, especially at the position where the pressing rib 54 is formed. By assembling it into the disc valve 14, the pressing rib 54 applies a radial pressing force to the disc valve 14 from the outer circumferential side toward the inner circumferential side, so that the slit 92 is stably closed. There is. That is, the pressing rib 54 provided on the inner circumferential surface 46 (46a) of the outer circumferential connector 34 compresses the outer circumferential surface of the disc valve 14 inward.

A cylindrical support portion 94 extending toward the proximal end is provided on the outer peripheral portion of the disc valve 14 . Further, in the outer circumferential portion of the proximal side surface 96 of the disk valve 14, on the inner circumferential side of the cylindrical support portion 94, there is an annular circumference that extends continuously over the entire circumference in the circumferential direction and opens toward the proximal side. A groove 98 is formed. However, such a cylindrical support portion 94 is not essential. Further, the circumferential groove 98 is not essential, and the circumferential groove 98 may be formed by pushing the tip of the support cylinder part 74 into the proximal side surface 96 of the disk valve 14.

Here, on the inner peripheral side of the inner peripheral connector 36, a cylindrical pusher 100 is accommodated on the proximal end side of the disc valve 14, and a cylindrical pusher 100 is housed in the center of the pusher 100, and a cylinder that penetrates in the axial direction is provided at the center of the pusher 100. An inner hole 102 is formed.

The inner diameter dimension of the pusher 100 is substantially constant over substantially the entire length in the axial direction, while the outer circumferential surface 103 of the pusher 100 has an annular stepped surface extending in the direction perpendicular to the axis at the intermediate portion in the axial direction. 104 is formed. That is, the outer diameter of the pusher 100 is such that the portion adjacent to the distal side of the stepped surface 104 is larger than the portion adjacent to the proximal end, and the outer diameter of the pusher 100 is larger than the portion adjacent to the proximal side of the stepped surface 104. , a straight outer circumferential surface 106 having a substantially constant outer diameter. On the other hand, on the distal side of the stepped surface 104, a tapered outer circumferential surface 108 is formed as a tapered surface whose diameter gradually decreases toward the distal end, with the portion adjacent to the distal side of the stepped surface 104 having the maximum outer diameter. has been done. Therefore, the outer circumferential surface 103 of the pusher 100 is configured to include a step surface 104, a straight outer circumferential surface 106, and a tapered outer circumferential surface 108. Further, the proximal end portion of the region where the tapered outer circumferential surface 108 is formed is an annular outer circumferential protrusion 110 that protrudes further outward than the straight outer circumferential surface 106 located on the proximal end side. A proximal end surface of the outer circumferential protrusion 110 is a stepped surface 104 .

In addition, in the pusher 100 of this embodiment, the inner diameter dimension on the distal end side of the step surface 104 gradually becomes smaller toward the distal end side. As a result, a certain degree of radial dimension can be secured even at the tip of the pusher 100, which has a tapered shape, and damage to the pusher 100 when inserted into the disk valve 14, which will be described later, can be avoided. The durability of the tip has been improved.

In this embodiment, as will be described later, the tip side of the step surface 104 of the pusher 100, that is, the tip portion of the tapered outer circumferential surface 108, is located at the tip of the pusher 100 when the external flow path (syringe 124) is connected. It is an insertion tip portion (see FIG. 5) that is inserted into the disk valve 14 when it is moved toward the tip side. In addition, in this embodiment, when the internal flow path 18 is in a communicating state (the state in which the pusher 100 moves toward the distal end and the disk valve 14 is pushed open), the distal end of the pusher 100 (the penetrating tip described later) 128) further protrudes from the disc valve 14 toward the distal end. As a result, when the elastic valve body (disc valve 14) is pushed open, the insertion region 112 that is brought into contact with the disc valve 14 is the distal end portion of the pusher 100 that has a tapered outer circumferential surface 108. It is set at the axially intermediate portion of the two (see FIG. 5).

In the present invention, as will be described later, a tapered portion is provided in the insertion region 112 by a tapered surface or a step surface, and the disk valve 14 held in the pushed open state is It suffices if it comes into contact with the stepped surface. In this embodiment, a disk is elastically deformed from the axially intermediate portion of the proximal inclined surface 116 (described later) to the axially intermediate portion of the distal inclined surface 114 (described later) on the tapered outer circumferential surface 108. It is an insertion region 112 that comes into contact with the valve 14, and the outer peripheral surface of the insertion region 112 is a tapered surface 113 (see FIG. 5) that is tapered as a whole. A tapered outer circumferential surface 108 includes the outer circumferential surface (tapered surface 113) of the insertion region 112. Note that the axial dimension of the insertion region 112 and a portion including the penetration tip portion 128 (described later) (insertion tip portion in FIG. 5) is not limited in any way, but is 2 mm or more from the tip of the pusher 100. More preferably, the outer circumferential surface is tapered by 4 mm or more. Further, it is preferable that the outer peripheral surface of the pusher 100 is tapered within a range of 2 mm to 8 mm from the tip, more preferably about 4 mm, for example, within a range of 5 mm to 6 mm.

That is, in this embodiment, the tapered outer circumferential surface 108 is formed in a tapered shape as a whole, and includes a distal end inclined surface 114 and a proximal inclined surface 116, which are respectively tapered, and both of these inclined surfaces 114, 116 at an axially intermediate portion of the tapered outer circumferential surface 108 (insertion region 112). In short, in the tapered outer circumferential surface 108, a tapered distal inclined surface 114 having a relatively small diameter is provided on the distal side of the steeply inclined surface 118, and on the proximal side of the steeply inclined surface 118. is provided with a tapered proximal end side inclined surface 116 having a relatively large diameter. The distal end side inclined surface 114, the proximal side inclined surface 116, and the steeply inclined surface 118 are each an annular tapered surface extending all the way around in the circumferential direction. Note that since the proximal inclined surface 116 protrudes further toward the outer circumferential side than the distal inclined surface 114, for example, when the tapered outer circumferential surface 108 has a single inclination angle equal to the inclination angle of the distal inclined surface 114. Compared to this, it is possible to improve the sealing performance when inserting the pusher 100 into the disc valve 14.

The inclination angles α, β, and γ (see FIG. 3) of the distal end side inclined surface 114, the proximal end inclined surface 116, and the steeply inclined surface 118 with respect to the axial direction are not limited in any way, but in this embodiment Here, each inclination angle α, β, and γ is set within a range of 0 degrees to 90 degrees. In particular, the inclination angle γ of the steeply sloped surface 118 with respect to the axial direction is made larger than the inclination angles α and β of the distal side sloped surface 114 and the proximal side sloped surface 116 with respect to the axial direction (α<γ, β<γ ). Further, the inclination angle α of the distal end side inclined surface 114 with respect to the axial direction is made larger than the inclination angle β of the proximal end side inclined surface 116 with respect to the axial direction (β<α). Further, the distal end inclined surface 114, the proximal inclined surface 116, and the steeply inclined surface 118 each have a substantially constant inclination angle in the axial direction.

In addition, in the outer circumferential surface (tapered surface 113) of the insertion region 112, the inclination angle θ (see FIG. 5) with respect to the horizontal direction is preferably set within the range of 1 degree to 75 degrees, and more preferably. is set within the range of 5 degrees to 75 degrees. By setting the inclination angle θ of the tapered surface 113 within the above range, a moving force toward the proximal end side can be effectively exerted on the pusher 100 when the syringe 124 is removed, as will be described later. Here, the inclination angle θ of the tapered surface 113 is the inclination angle of a straight line that virtually connects the distal end and the proximal end of the insertion region 112, and includes, for example, the distal end inclined surface 114, the proximal inclined surface 116, the steep One or more of the inclination angles α, β, and γ of the inclined surface 118 may be partially outside the above range.

Of course, the tapered outer circumferential surface 108 does not need to have different inclination angles in the axial direction as in this embodiment, and may have a substantially constant inclination angle over substantially the entire length in the axial direction. Further, in this embodiment, the distal end side inclined surface 114 and the steeply inclined surface 118, and the steeply inclined surface 118 and the proximal side inclined surface 116 are connected by smooth curved surfaces, respectively, so that the tapered outer periphery Substantially the entire surface 108 is smoothly continuous. Note that the distal end inclined surface 114 and the steeply inclined surface 118 and/or the steeply inclined surface 118 and the proximal inclined surface 116 may be connected by being bent.

In this way, by providing the steeply inclined surface 118 with a relatively large inclination angle on the tapered outer circumferential surface 108, the elastic restoring force of the disk valve 14 exerted on the steeply inclined surface 118 when the syringe 124 is removed is reduced. Since the axial component can be increased, the pusher 100 can be more stably moved toward the proximal end.

Further, a rear support portion 120 that protrudes toward the outer circumferential side is provided at an axially intermediate portion of the outer circumferential surface 103 of the pusher 100, that is, on the straight outer circumferential surface 106. The rear support portion 120 has a substantially annular shape extending substantially all the way around in the circumferential direction, and the tip side end surface of the rear support portion 120 is an annular surface that extends in the direction perpendicular to the axis.

In a state where the pusher 100 is accommodated in the connection connector 28 (inner circumference connector 36), the engagement protrusion (inner circumference protrusion) 68 of the inner circumference connector 36 and the rear support portion 120 of the pusher 100 are connected to each other. A metal coil spring 122 as a spring member is fitted onto the outer circumferential side of the straight outer circumferential surface 106 between the straight outer circumferential surfaces 106 in the axial direction. That is, the distal end (front end) of the coil spring 122 is fixed to and supported by the engagement protrusion 68, and the proximal end (rear end) of the coil spring 122 is fixed to the rear support portion 120. is fixed and supported. Therefore, in this embodiment, the front support portion that supports the front end portion of the coil spring 122 is constituted by the engagement protrusion (inner peripheral protrusion) 68 . In an initial state before the syringe 124 is connected as shown in FIGS. 2 and 3, the coil spring 122 is arranged in a substantially uncompressed state (substantially natural length).

The connecting connector 28 includes the outer peripheral connector 34 and the inner peripheral connector 36 having the above structure, and the disc valve 14 and the pusher 100 are housed inside the connecting connector 28.

That is, the pusher 100 is inserted and disposed through the opening on the distal end side of the inner peripheral connector 36. At this time, the proximal end position of the pusher 100 is such that the engagement protrusion 68 provided on the inner circumferential surface 66 of the inner circumferential connector 36 and the stepped surface 104 provided on the outer circumferential surface 103 of the pusher 100 are mutually aligned. It is defined by contact. In addition, in the accommodated state of the pusher 100, the straight outer peripheral surface 106 of the pusher 100 and the inner peripheral surface of the engagement protrusion 68 are in contact with each other or are slightly separated from each other, and the tapered shape of the pusher 100 The outer circumferential surface at the proximal end portion of the outer circumferential surface 108 (the proximal end portion of the proximal inclined surface 116, that is, the maximum outer diameter portion of the tapered outer circumferential surface 108) is in slight contact with the guide surface 70 of the inner circumferential connector 36. are separated by This allows the pusher 100 to move in the axial direction while being guided by the inner circumferential surface 66 of the inner circumferential connector 36.

A cylindrical support portion 94 of the disk valve 14 is placed over and supported at the tip end portion of the inner peripheral connector 36. That is, the distal end portion of the support cylinder portion 74, which is the distal end of the inner circumferential connector 36, is inserted into the circumferential groove 98 provided on the proximal side surface 96 of the disc valve 14. In this embodiment, the inner and outer circumferential surfaces of the distal end portion of the support cylinder portion 74 are in contact with or are slightly separated from the inner and outer circumferential surfaces that constitute the inner surface of the circumferential groove 98, respectively. Note that a gap may be provided in the axial direction between the distal end surface of the support cylinder portion 74 and the groove bottom surface of the circumferential groove 98.

Further, the inner circumferential surface of the cylindrical support portion 94 of the disk valve 14 is in contact with the outer circumferential surface of the support tube portion 74, and the distal end portion of the inner circumferential connector 36 is fitted into the base end side of the disk valve 14. ing. In this embodiment, when the disc valve 14 is supported, the tip of the pusher 100 is in contact with the proximal side surface 96 of the disc valve 14, and the pusher 100 is in contact with the engagement protrusion of the disc valve 14. It is positioned in the axial direction with respect to the portion 68. Note that the tip of the pusher 100 does not necessarily need to come into contact with the proximal side surface 96 of the disk valve 14, and the tip of the pusher 100 and the proximal side surface 96 of the disk valve 14 may be spaced apart from each other in the axial direction. Good too.

An outer peripheral connector 34 is assembled from the distal end side of the disc valve 14. That is, the distal end portion of the inner circumferential connector 36 is inserted through the proximal opening 58 of the outer circumferential connector 34 with the disk valve 14 placed on and supported at the distal end, and the engaging protrusions 76, 76 of the inner circumferential connector 36 are inserted into the outer circumferential connector 34. By engaging with the engagement holes 56, 56 of the connector 34, the outer circumferential connector 34 and the inner circumferential connector 36 are connected and fixed on substantially the same central axis in an inserted/externally inserted state and in series in the axial direction.

In this embodiment, since the distal end surfaces of the engagement protrusions 76, 76 are sloped surfaces 78, 78, the engagement protrusions 76, 76 can be easily fitted into the engagement holes 56, 56. has been done. Furthermore, since the proximal end surfaces of the engaging protrusions 76 , 76 are vertical surfaces 80 , 80 , it is possible to remove the engaging protrusions 76 , 76 from the engaging holes 56 , 56 , that is, to remove the inner parts from the outer peripheral connector 34 . The peripheral connector 36 is prevented from being pulled out.

Further, in this embodiment, since the inclined grooves 64, 64 including the inclined surfaces 62, 62 are formed in the proximal opening 58 of the outer circumferential connector 34, the inner circumference of the outer circumferential connector 34 is When the circumferential connector 36 is inserted, the engaging protrusions 76, 76 are inserted into the inclined grooves 64, 64, so that relative rotation in the circumferential direction between the outer circumferential connector 34 and the inner circumferential connector 36 can be prevented. Further, since the engaging protrusions 76, 76 are stably guided to the engaging holes 56, 56 by the guiding action of the inclined surfaces 62, 62, the engaging protrusions 76, 76 are more reliably guided to the engaging holes 56, 56. can be engaged with.

Furthermore, when inserting the inner connector 36 into the outer connector 34, the positioning protrusions 82, 82 of the inner connector 36 are inserted into the notches 60, 60 provided in the proximal opening 58 of the outer connector 34. Accordingly, the outer peripheral connector 34 and the inner peripheral connector 36 can be easily positioned in the circumferential direction, and the engaging protrusions 76, 76 can be more reliably engaged with the engaging holes 56, 56.

When the outer circumferential connector 34 and the inner circumferential connector 36 are assembled, the outer circumferential portion of the disc valve 14 is axially and perpendicularly moved between the outer circumferential connector 34 and the inner circumferential connector 36 that are assembled to each other. By being positioned and held, the disc valve 14 is assembled with the outer peripheral connector 34 and the inner peripheral connector 36 in a fitted state. That is, the outer circumferential portion of the disc valve 14 is located between the stepped surface 52, which is the proximal end surface of the annular wall portion 50 provided on the outer circumferential connector 34, and the support cylinder portion 74, which is the distal end portion of the inner circumferential connector 36. It is held between. Further, a cylindrical support portion 94 protruding toward the base end side of the disk valve 14 is preferably held in a compressed state between the peripheral wall 38 of the outer peripheral connector 34 and the support cylindrical portion 74 in the radial direction. Further, the disc valve 14 is assembled by being compressed radially inwardly by the peripheral wall 38 of the outer circumferential connector 34, particularly by the pressing rib 54.

Note that by assembling the outer circumferential connector 34, inner circumferential connector 36, disk valve 14, and pusher 100, for example, with the tips facing upward, the disk valve 14 will not come off from the inner circumferential connector 36 during assembly. etc. can be effectively prevented and the assembly efficiency can be improved, but the direction in which these members are assembled is not limited in any way.

By axially connecting the cannula 12, the needle hub body 24, the elastic tube 26, and the connector 28, which includes the disc valve 14 and the pusher 100, as described above, the valved needle assembly 10 of this embodiment is constructed. It is configured. Such a valved needle assembly 10 can be indwelled with a hemostatic valve by, for example, inserting an inner needle unit (not shown) that includes an inner needle with a needle tip into the valved needle assembly 10 as an outer needle unit. Used as a needle assembly. That is, after the inner needle unit is inserted into the outer needle unit (needle assembly with valve) 10 and punctures the skin of the patient, the inner needle unit is pulled out from the outer needle unit 10 toward the proximal end, and the inner needle unit is inserted into the patient's skin. The outer needle unit 10 is percutaneously inserted and left in the blood vessel of the patient. Alternatively, by using the cannula 12 as a hollow needle made of metal or the like having a needle tip, the valved needle assembly 10 can be directly punctured and left in the patient's blood vessel. Note that in this state of indwelling in the blood vessel, the internal flow path 18 of the valved needle assembly 10 is blocked by the disk valve 14.

A syringe 124, for example, is connected as an external flow path to the proximal opening 84 of the connector 28 (the proximal opening of the inner peripheral connector 36) in the valved needle assembly 10. As a result, as shown in FIGS. 4 and 5, the male luer 126 such as the syringe 124 pushes the pusher 100 toward the distal end, and the distal end of the pusher 100 is inserted into the disc valve 14, thereby causing the disc The slit 92 of the disk valve 14 is opened while the central portion 90 of the valve 14 is expanded toward the distal end, so that the internal flow path 18 is brought into communication. Thereby, infusion, blood collection, hemodialysis, etc. can be performed through the internal channel 18 that includes the inner hole of the cannula 12, the inner hole of the elastic tube 26, and the inner hole 102 of the pusher 100.

In this embodiment, the distal end of the pusher 100 is inserted into the disk valve 14 from the axially intermediate portion of the proximal inclined surface 116 to push open the central portion 90. An insertion region 112 is a portion of the distal end portion that comes into contact with the disk valve 14 . That is, by inserting the pusher 100 into the disk valve 14, the disk valve 14, which is elastically deformed toward the tip side, and the outer peripheral surface (tapered surface 113) of the insertion region 112 of the pusher 100 come into contact with each other. The elastic restoring force of the disc valve 14 is applied to the outer circumferential surface (tapered surface 113) of the insertion region 112, that is, from the distal inclined surface 114 to the proximal inclined surface 116. There is. As a result, due to the elastic restoring force of the disc valve 14, a biasing force is applied to the pusher 100 in a direction toward the proximal end with respect to the disc valve 14 (and the connecting connector 28 that holds the disc valve 14). ing.

In particular, in this embodiment, when the disk valve 14 is pushed open, the tip portion of the pusher 100 penetrates the disk valve 14 and protrudes from the disk valve 14 toward the tip side (forward). A penetrating tip 128 that penetrates the disk valve 14 is provided at the tip of the pusher 100. That is, the outer circumferential surface 130 of the penetrating tip 128 is formed by the tip of the tip side inclined surface 114, and includes the outer circumferential surface 130 of the penetrating tip 128 and is tapered as the outer circumferential surface of the tip of the pusher 100. A shaped outer circumferential surface 108 is configured.

Furthermore, in the connected state of the syringe 124, that is, in a state in which the pusher 100 has moved toward the distal end, the engagement protrusion 68 of the inner peripheral connector 36 and the rear support portion 120 of the pusher 100 approach each other in the axial direction. As a result, the coil spring 122 provided between the engaging protrusion 68 and the rear support portion 120 is compressed in the axial direction. Therefore, in the state in which the pusher 100 has moved toward the distal end (the disc valve 14 has been pushed open), the pusher 100 has an elastic force that causes the pusher 100 to move toward the connecting connector 28 due to the elastic restoring force of the coil spring 122. A biasing force is applied in a direction toward the proximal end.

On the other hand, when the syringe 124 is removed from the connector 28 at the end or interruption of infusion, blood collection, or hemodialysis, the pusher 100 moves toward the proximal end according to the biasing force exerted by the disc valve 14 and the coil spring 122. It is now possible to move it. That is, the disk valve 14 and the coil spring 122 are restored to their initial shapes by the elastic restoring action of the disk valve 14 and the coil spring 122, and are pushed back by the restored and deformed disk valve 14 and the coil spring 122, so that the pusher 100 is adapted to be moved proximally to the initial position shown in FIGS. 1-3 above. As a result, the slit 92 of the disc valve 14 is closed, and the internal flow path 18 is placed in a blocked state. In this embodiment, the moving end of the pusher 100 toward the proximal end is between the step surface 104 provided on the outer peripheral surface 103 of the pusher 100 and the inner peripheral surface of the connecting connector 28 (inner peripheral connector 36). It is defined by contact with an engaging protrusion 68 provided at 66.

That is, in this embodiment, as the syringe 124 is removed, the elastic restoring force of the disk valve 14 is exerted on the pusher 100 as a force pushing it back toward the proximal end, and the elastic restoring force of the coil spring 122 is The force is exerted on the pusher 100 as a pushing force back toward the proximal end side. As a result, the restoring force of the disc valve 14 and the restoring force of the coil spring 122 work together to push the pusher 100 back toward the proximal end, so that the pusher 100 stably moves toward the proximal end. ing.

In particular, since the restoring force of the coil spring 122 can be kept small, the coil spring 122 and, by extension, the valved needle assembly 10 can be made smaller. In addition, the restoring force of the coil spring 122 exerted on the connector 28 (inner circumferential connector 36) that supports the coil spring 122 and the pusher 100 can be suppressed to a small level, which is necessary for the connector 28 and the pusher 100. The strength of the members can also be kept low, and the connector 28 and pusher 100 can be made smaller. Furthermore, by keeping the restoring force of the coil spring 122 low, the possibility that the user will feel a sense of resistance (repulsion) when inserting and connecting the syringe 124 is reduced, and operability can be improved. Specifically, when the ISO standard medical male taper connector is inserted into the connection connector 28 (inner peripheral connector 36) which is the ISO standard medical female taper connector and taper-fits (in this embodiment, the elastic valve In contrast to the repulsive force F of the coil spring 122 when the body (disc valve 14 is pushed open) is larger than about 300 gf (about 300 gf<F) in the valve needle assembly of the conventional structure, this embodiment Then, it can be within the range of 10gf<F<200gf. That is, in this embodiment, the repulsive force F of the coil spring 122 when the disc valve 14 is in contact with the tapered outer circumferential surface 108 of the pusher 100 is set within the range of 10 gf<F<200 gf. Specifically, at the position where the pusher 100 moves toward the distal end where the distance from the proximal end surface of the needle hub 16 to the proximal end surface of the pusher 100 is 6 mm, the compressed coil spring 122 repulses. The force F is set within the range of 10gf<F<200gf.

Further, since the outer peripheral surface (tapered surface 113) at the distal end portion (insertion area 112) of the pusher 100 has a tapered shape, the elastic restoring force of the disk valve 14 is applied to the proximal end of the pusher 100. can be effectively exerted as a moving force. That is, when the outer circumferential surface of the distal end portion of the pusher is substantially linear as in the valved needle assembly described in Patent Document 1, the outer circumferential surface of the pusher and the elastic valve body (disc) that come into contact with each other There was a problem in that the pusher was difficult to return to the proximal end side due to friction with the valve), and therefore the repulsive force of the coil spring had to be increased.However, as in this embodiment, the tip of the pusher 100 is tapered. By adopting the tapered shape, the elastic restoring force of the disk valve 14 can be efficiently obtained as a force for pushing back the pusher 100 toward the proximal end side. In particular, in this embodiment, the pusher 100 includes a penetrating tip 128 that penetrates the disc valve 14 and projects toward the distal side when moving toward the distal side, and the outer circumferential surface 130 of the penetrating tip 128 is tapered. Because of the tapered shape, when the pusher 100 moves toward the proximal end, the disk valve 14 and the outer circumferential surface 130 of the penetrating tip 128 come into contact with each other, so that the disk valve 14 can be elastically restored. The force can be effectively obtained as a force for moving the pusher 100 toward the proximal end.

Furthermore, by employing the above configuration, the pusher 100 can easily move toward the proximal end, but the pusher 100 and the connecting connector 28 are connected to the outer circumferential protrusion 110 and the inner circumferential protrusion (engaging protrusion). ) 68 defines the end of movement of the pusher 100 toward the proximal end, so that the pusher 100 can be effectively prevented from falling off from the connection connector 28.

Further, in this embodiment, a coil spring 122 is disposed between the engaging protrusion 68 of the connector 28 and the rear support portion 120 of the pusher 100 in the axial direction, that is, on the base end side of the pusher 100. Therefore, it is avoided that the coil spring 122 is disposed on the outer peripheral side of the tip portion of the pusher 100, for example. Therefore, the degree of freedom in designing the shape of the tip portion (insertion region 112) of the pusher 100 inserted into the disc valve 14 is improved, and it becomes possible to design the insertion region 112 into an appropriate shape.

In particular, in this embodiment, the engagement protrusion 68 that protrudes inward from the inner circumferential surface 66 of the connecting connector 28 (inner circumferential connector 36) is skillfully utilized to It is possible to simultaneously restrict the movement of the coil spring 122 and support the tip of the coil spring 122.

Furthermore, the needle hub 16 of this embodiment is configured to include a connecting connector 28, and the connecting connector 28 is configured by inserting the outer peripheral connector 34 and the inner peripheral connector 36 into each other. Since the disc valve 14 is sandwiched and supported between the outer connector 34 and the inner connector 36, it is easy to assemble the disc valve 14 to the connector 28 (inner connector 36). obtain. In particular, the disc valve 14 is provided with a cylindrical support portion 94 that protrudes toward the proximal end, and the cylindrical support portion 94 is supported in a compressed state between the outer circumferential connector 34 and the inner circumferential connector 36 in the radial direction. By doing so, when the syringe 124 is connected, that is, when the pusher 100 moves toward the distal end, the disc valve 14 can be effectively prevented from falling off from the connection connector 28 toward the distal end.

Although the embodiments of the present invention have been described above, the present invention is not to be construed as being limited by the specific descriptions in such embodiments, and various changes, modifications, improvements, etc. can be made based on the knowledge of those skilled in the art. It can be implemented in a manner in which the following is added.

For example, in the embodiment described above, the coil spring (spring member) 122 is inserted into the proximal end portion of the pusher 100 (the portion where the straight outer circumferential surface 106 is formed), but A coil spring 122 may be extrapolated at the portion where the surface 108 is formed. That is, for example, the rear support portion 120 provided on the outer circumferential surface 103 of the axially intermediate portion of the pusher 100 and the inner circumferential surface (guiding surface 70) of the tip portion (for example, the support cylinder portion 74) of the inner circumferential connector 36 are provided. A coil spring 122 may be provided axially between the provided front support portion and the distal end of the coil spring 122 may be fixed to the proximal side surface 96 of the disc valve 14. In this case, the rear support portion 120 may be constituted by the outer circumferential protrusion 110 that restricts movement of the pusher 100 toward the base end, or may be formed separately from the outer circumferential protrusion 110. However, the coil spring 122 has a front support portion formed by the proximal side surface 96 of the disk valve 14, and a rear support portion 120 provided on the outer circumferential surface 103 of the proximal end portion of the pusher 100, so that the coil spring 122 can be pushed. It may be formed with a length dimension extending substantially over the entire length of the child 100 in the axial direction. Note that when the tip end of the coil spring 122 is fixed to the disk valve 14, the coil spring 122 may tilt due to elastic deformation of the disk valve 14 and become unstable. The end portion is preferably fixed to a hard member such as the inner peripheral connector 36 or the pusher 100.

Further, the spring member is not limited to the metal coil spring 122 as in the embodiment described above, but may be formed of rubber or elastomer. Furthermore, the spring member is not limited to the linear shape (coil shape) as in the above embodiments, but may be in the shape of a bellows tube, a block shape, or the like.

Furthermore, in the embodiment described above, the spring member (coil spring 122) is compressively deformed by connecting the syringe 124 (by moving the pusher 100 toward the distal end side); It's okay. That is, by removing the syringe 124, the spring member may be elastically restored to its initial shape, thereby exerting a pulling force on the pusher 100. The coil spring 122, which is tensilely deformed when the syringe 124 is connected, is provided, for example, between the outer protrusion 110 of the pusher 100 and the engagement protrusion 68 of the inner connector 36 in the axial direction.

Furthermore, in the embodiment described above, the tapered outer circumferential surface 108 was configured to include the distal end inclined surface 114, the proximal end inclined surface 116, and the steeply inclined surface 118, each having a different inclination angle, but it is limited to this embodiment. Instead, for example, the slope angles of the distal end side inclined surface 114 or the proximal side inclined surface 116 and the steeply inclined surface 118 may be made equal, so that the steeply inclined surface 118 is substantially composed of two inclined surfaces, The inclination angles of the distal end side inclined surface 114 and the proximal side inclined surface 116 may be made equal. Alternatively, the slope angles of the slopes 114, 116, and 118 may be made equal, so that the tapered outer circumferential surface 108 is substantially composed of a single slope. Of course, the steeply inclined surface 118 may widen in the direction perpendicular to the axis to form a stepped surface (γ=90°). 118) and the elastic restoring force of the disc valve 14 is applied to the stepped surface (steeply inclined surface 118), thereby stably exerting a pushing force back toward the proximal side of the pusher 100. . That is, the tip portion (insertion region 112) of the pusher 100 may be provided with a stepped surface, and the pusher 100 may have a tapered shape as a whole.

In the above embodiment, when the syringe 124 is connected (the pusher 100 has moved toward the distal end), the most distal end of the pusher 100 serves as the penetrating tip 128, which penetrates the disk valve 14. Although the pusher 100 is configured to protrude to the distal end side of the disc valve 14, the distal end portion of the pusher 100 may be configured to push the disc valve 14 open without penetrating the disc valve 14.

Further, in the embodiment, the tapered distal inclined surface 114 and the proximal inclined surface 116 are provided on the distal side and the proximal side of the steeply inclined surface 118, respectively. Although the angle α and the inclination angle β of the proximal inclined surface 116 are each within the range of 0 degrees to 90 degrees, the present invention is not limited to such an embodiment. For example, the slope angle α of the distal slope 114 and/or the slope angle β of the proximal slope 116 may be 0 degrees, that is, the slope distal and/or proximal to the steep slope 118 is axial. It may extend parallel to the direction. Even in such a case, at least the pressed open disk valve 14 and the steeply inclined surface 118 come into contact and the elastic restoring force of the disk valve 14 is applied to the steeply inclined surface 118, so that the pusher 100 is stabilized. can be pushed back proximally.

In the embodiment described above, the tapered outer circumferential surface 108 having a tapered shape at the tip of the pusher 100 was provided over a predetermined length in the axial direction from the tip of the pusher 100. The outer circumferential surface 103 may have a tapered shape extending substantially over the entire length in the axial direction, or may have a stepped shape having one or more stepped surfaces.

Further, in the embodiment described above, the needle hub 16 was configured to include the needle hub body 24, the elastic tube 26, and the connection connector 28, but for example, the elastic tube 26 is not essential, and the needle hub body 24 and The connecting connector 28 may be formed integrally. That is, for example, the cannula 12 may protrude from the tip of the connector 28.

Further, in the embodiment described above, the connecting connector 28 is configured to include the outer circumferential connector 34 and the inner circumferential connector 36 that are inserted into and inserted into each other, but may be formed integrally, for example. Further, even when separate members are formed by fixing them to each other, they are not limited to being inserted into and inserted into each other, but may be connected and fixed in the axial direction, for example. Furthermore, the fixing means for fixing separate members to each other is not limited to the concave-convex engagement as in the embodiment described above, and any conventionally known fixing means such as adhesion or welding may be employed.

10: Needle assembly with valve, 12: Cannula (hollow needle), 14: Disc valve (elastic valve body), 16: Needle hub, 34: Outer circumference connector, 36: Inner circumference connector, 66: Needle hub (inner circumference connector) ), 68: Engaging protrusion (inner circumferential protrusion, front support part), 94: Cylindrical support part, 100: Pusher, 103: Outer circumferential surface of pusher, 108: Tapered outer circumferential surface ( (Tapered surface), 110: Outer peripheral protrusion, 112: Insertion region, 113: Tapered surface (outer peripheral surface of insertion region), 120: Rear support section, 122: Coil spring (spring member), 128: Penetrating tip, 130: Outer surface of the penetration tip

Claims (6)

A needle assembly with a valve, in which an elastic valve body is arranged inside a needle hub provided on the proximal end side of a hollow needle, and a cylindrical pusher is provided that pushes open the elastic valve body by moving forward. In,
The outer circumferential surface of the insertion region of the pusher inserted into the elastic valve body when the elastic valve body is pushed open is tapered, and the force of pushing back backward due to the elasticity of the elastic valve body is applied to the pusher. At the same time,
A spring member is provided that is deformed by the forward movement of the pusher, and the restoring force of the spring member deformed when the elastic valve body is pushed open acts as a backward return force against the pusher. and
The needle hub includes an outer circumferential connector and an inner circumferential connector that are assembled by being inserted into and inserted into each other, and the proximal end of the inner circumferential connector is larger than the outer circumferential connector by a predetermined axial dimension. As well as extending to the side,
The inner peripheral connector includes a guide surface that guides the axial movement of the pusher,
The spring member is provided between the inner circumferential connector and the pusher in the radial direction, and the spring member is externally inserted behind a portion of the pusher that forms a tapered outer circumferential surface. A needle assembly with a valve, characterized in that the needle assembly is disposed inside the maximum outer diameter portion of the pusher in the radial direction of the pusher. The outer circumferential protrusion provided on the outer circumferential surface of the pusher and the inner circumferential protrusion provided on the inner circumferential surface of the needle hub contact each other, so that the end of the movement of the pusher toward the proximal end is A valved needle assembly according to claim 1, adapted to be defined. A front support part is provided on the inner peripheral surface of the needle hub, and a rear support part is provided on the axially intermediate part of the pusher, and the front support part and the rear support part project on the outer peripheral surface. The valved needle assembly according to claim 1 or 2, wherein the spring member is disposed axially between the rear support portion and the rear support portion. Any one of claims 1 to 3, wherein the outer circumferential surface of the insertion region of the pusher is a tapered surface, and the inclination angle of the tapered surface is set within a range of 1 to 75 degrees. A valved needle assembly as described in . A tapered surface is provided on the outer circumferential surface of the pusher, and a tip portion of the pusher extends forward through the elastic valve body when the elastic valve body is pushed open. The valved needle assembly according to any one of claims 1 to 4, further comprising a penetrating tip, and the tapered surface including an outer peripheral surface of the penetrating tip. The inner circumferential connector includes an inner circumferential surface on which the pusher is movably disposed, and is fitted onto the pusher so that the spring member is moved from the inner circumferential surface in the radial direction. The valved needle assembly according to any one of claims 1 to 5, wherein the needle assembly is disposed close to the outer peripheral surface of the pusher.

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