JP5491227B2 - Adapter for connection, mixed injection member and medical circuit - Google Patents

Description

  The present invention relates to a connection adapter, a mixed injection member, and a medical circuit.

  Conventionally, as a connection adapter for connecting a syringe or the like to a mixed injection portion of a mixed injection member provided in a medical circuit such as a blood circuit or an infusion circuit, a needle tube and a substantially cylindrical needle configured to cover the needle tube A connection adapter including a protective hood and a screw connection portion connected to a syringe or the like is known (see, for example, Patent Documents 1 to 3). Two U-shaped notches are provided on the distal end side of the needle protection hood. A spiral protrusion is provided on the outer peripheral surface of the screw connection portion.

  In this specification, the “tip side of the needle protection hood” refers to the end of the needle protection hood that is closer to the tube connection part of the mixed injection member when connected to the mixed injection member (that is, the screw side of the needle protection hood). The end side opposite to the joint portion).

  According to the conventional connection adapter, the needle protection hood is provided so as to cover the needle tube. Therefore, when connecting the connection adapter to the co-injection part, the user accidentally pierces the needle tube. The occurrence of (so-called false stings) can be suppressed. In addition, since two U-shaped notches are provided on the tip side of the needle protection hood, when the connection adapter is connected to the co-injection part, the tube connection part of the co-infusion member (or connection to the tube connection part) It is possible to prevent the needle protection hood from interfering (collision) with the tube). Furthermore, since the outer peripheral surface of the screw connection part is provided with a spiral protrusion, the connection part is a luer lock type, such as a luer lock type (screw type) syringe (hereinafter referred to as a luer lock type syringe). Etc.) and can be suitably connected.

JP 2007-295998 A JP 2002-113111 A JP 2006-345916 A

  By the way, in the connection adapter connectable with a luer lock type syringe etc., there exists a request | requirement of improving the ease of removal (henceforth removal ease) when removing the connection adapter from a co-injection part.

  Therefore, the present invention has been made in view of such circumstances, and is a connection adapter that can be connected to a luer lock type syringe or the like, and suppresses the occurrence of false puncture while the needle protection hood at the time of connection is It is an object of the present invention to provide a connection adapter, a co-infusion member, and a medical circuit that can prevent interference and have improved detachability compared to the conventional art.

[1] In order to achieve the above object, the present inventors have conducted intensive research to find a means for improving the ease of removal compared to the conventional art. In the course of the research, when the connection adapter is rotated around the needle tube while the connection adapter is connected to the mixed injection part, the connection adapter is removed from the mixed injection part according to the rotation (hereinafter referred to as extraction). If it is configured to move in the direction), it is considered that the force required to pull out the connection adapter is smaller than the conventional one, and as a result, the ease of removal is improved as compared with the conventional one.

  Based on this idea, the present inventors have made further studies to find a means for moving the connection adapter in the extraction direction in accordance with the rotational operation of the connection adapter. As a result, pay attention to the outer peripheral surface of the tube connection part (or tube connected to the tube connection part) of the mixed injection member and the notch shape of the notch provided in the needle protection hood. When the adapter is rotated, the notch shape of the portion that comes into contact with the tube connecting portion (or the tube connected to the tube connecting portion) of the co-infusion member spreads from the threaded connecting portion side toward the distal end side of the needle protection hood. If it is a shape, it will be conceived that the connection adapter moves in the extraction direction in accordance with the rotation operation of the connection adapter as will be described later, and as a result, the ease of removal is improved as compared with the conventional case, and the present invention is completed. It came.

  That is, the connection adapter (100) of the present invention is configured to cover the needle tube (110) and the needle tube (110), and has a needle protection hood (at least one notch (122) provided on the distal end side). 120) and a tubular threaded connection (140) communicating with the needle tube (110), and the notch (122) is divided into two by a virtual plane (V) including the central axis of the needle tube The first and second cutouts when the cutout portion on one side is the first cutout portion (124) and the cutout portion on the other side is the second cutout portion (128) when divided. At least one of them has a notch shape that widens from the screw connection part (140) side toward the tip side of the needle protection hood (120).

  For this reason, according to the adapter for connection of this invention, since the needle protection hood is provided so that a needle tube may be covered, generation | occurrence | production of a mispuncture can be suppressed. Moreover, since at least one notch is provided on the distal end side of the needle protection hood, interference of the needle protection hood at the time of connection can be prevented. Furthermore, since the screw connection part is provided, it can be suitably connected to a luer lock type syringe or the like.

  Further, according to the connection adapter of the present invention, at least one of the first and second cutouts described above has a cutout shape that extends from the screw connection part side toward the distal end side of the needle protection hood. When the connection adapter is rotated in the direction in which the portion having the cutout shape comes into contact with the tube connecting portion (or the tube connected to the tube connecting portion) of the mixed injection member, The portion having the notch shape rides on the outer peripheral surface of the tube connection portion (or the tube connected to the tube connection portion) of the mixed injection member, and the connection adapter gradually moves in the extraction direction. As a result, the force required to pull out the connection adapter can be smaller than in the prior art, and the ease of removal can be improved as compared with the prior art.

  Therefore, the connection adapter of the present invention is a connection adapter that can be connected to a luer lock type syringe or the like, and can prevent the interference of the needle protection hood at the time of connection while suppressing the occurrence of false puncture, The connection adapter is more easily removed than before.

[2] In the connection adapter (100) of the present invention, the notch (122) is arranged such that the screw connection (140) is located above and the needle protection hood (120) is located below. When viewed from the front, the first notch (124) is positioned on the right side of the virtual plane (V), and the second notch (128) is on the left side of the virtual plane (V). Is located on the outer peripheral surface of the threaded connection portion (140), and a spiral protrusion (142) that rises to the right is provided, and at least the first notch portion (124) is located at the threaded connection portion. It is preferable to have a notch shape that extends from the (140) side toward the tip side of the needle protection hood (120).

  In the luer lock type syringe or the like, the configuration of the portion to be screwed and connected to the screw connection portion of the connection adapter (hereinafter referred to as the luer lock portion) can be locked by turning clockwise with respect to the connection adapter. In this case, by rotating the luer lock type syringe or the like by configuring as described above, the connection adapter is relatively removed from the mixed injection member main body without releasing the screw connection between the luer lock part and the screw connection part. It can be easily removed.

[3] In the connection adapter (100) of the present invention, the cutout shape is preferably a semi-arch shape.

[4] In the connection adapter (200) of the present invention, the cutout shape includes the first curved surface portion (225) positioned on the screw connection portion (240) side and the tip of the needle protection hood (220). It is preferable that the second curved surface portion (226) positioned on the side is combined, and the first curved surface portion (225) has a semi-arch shape.

[5] In the connection adapter (300) of the present invention, the notch is formed on the curved surface portion (325) positioned on the screw connection portion (340) side and the tip side of the needle protection hood (320). The curved portion (325) has a semi-arch shape, and the straight portion (326) is formed from the boundary portion with the curved portion (325). It is preferable that the shape of the needle protection hood (320) is inclined so as to spread toward the distal end side.

[6] In the connection adapter (400) of the present invention, the notch shape is a straight line that is inclined so as to spread from the screw connection part (440) side toward the distal end side of the needle protection hood (420). A shape including a portion is preferred.

  By adopting the configuration described in [3] to [6] above, it is possible to reliably realize movement of the connection adapter in the extraction direction in accordance with the rotation operation of the connection adapter.

[7] In the connection adapter (100) of the present invention, two notches (122) are provided on the tip side of the needle protection hood (120), and the two notches (122) are It is preferable that the needle tubes (110) are disposed to face each other.

  By comprising in this way, it becomes especially suitable in connecting with the mixed injection member (one tube connected one by one in the position symmetrical about the mixed injection member) arranged in the middle of the line. .

[8] The mixed injection member (50) of the present invention includes the mixed injection member main body (150) configured to be disposed in the medical circuit, and the connection adapter (100) of the present invention. (150) includes a tube connection portion (162, 164) configured to be connectable to the tube of the medical circuit, a mixed injection portion (170) communicating with the tube connection portion (162, 164), and the connection It has an adapter holding part (180) holding an adapter (100).

  For this reason, according to the mixed injection member of the present invention, since the above-described excellent connection adapter is provided, it is a mixed injection member that can be connected to a luer lock type syringe, etc. Interference of the needle protection hood at the time can be prevented, and a co-infusion member that is easier to remove than the conventional one is obtained.

[9] In the mixed injection member (50) of the present invention, the connection state is maintained in the mixed injection member main body (150) when the connection adapter (100) is connected to the mixed injection member main body (150). The connecting adapter (100) is engageable with the engaging portion when the connecting adapter (100) is connected to the mixed injection member main body (150). It is preferable that an engaged portion is provided.

  By comprising in this way, it becomes possible to suppress the undesirable disconnection when the connection adapter is connected to the mixed injection member main body.

[10] In the mixed injection member (50) of the present invention, the engaging portion is a protrusion (190) having a predetermined protruding height, and the engaged portion is configured such that the connecting adapter (100) is connected to the connecting adapter (100). It is preferable that the hole is a fitting hole (130) that fits into the protrusion (190) when connected to the mixed injection member main body (150).

  By comprising in this way, the connection state of a connection adapter and a co-injection member main body can be maintained with the comparatively simple structure of a protrusion and a fitting hole. If the combination of the protrusion and the fitting hole is used, when the connection adapter is rotated to remove the connection adapter, the engagement state between the protrusion and the fitting hole is released without requiring a large force. It becomes possible.

[11] In the mixed injection member of the present invention, the connection adapter (100) is preferably made of a plastic material.

  Since the connection adapter made of a plastic material has lower rigidity than the connection adapter made of a metal material, when the connection adapter is rotated when the connection adapter is removed, the above-described engaging portion and the engaged portion are engaged. The engagement state with the portion can be released without requiring a large force.

[12] A medical circuit (1) according to the present invention includes the mixed injection member (50) according to the present invention.

  For this reason, according to the medical circuit of the present invention, since the above-described excellent mixed injection member is provided, it is possible to connect a luer lock syringe or the like, and prevent false puncture when connecting a luer lock syringe or the like. This is a medical circuit that is excellent in operability and connectivity with a co-injection member, and also excellent in ease of removal when disconnecting from a luer lock syringe or the like.

  In addition, the reference numerals added in parentheses below the wording of each member, etc. described in the claims and in this column (column of means for solving the problems) are the contents described in the claims and this column. It is used for facilitating understanding of the present invention, and does not limit the contents described in the claims and in this section.

1 is a schematic diagram of a medical circuit 1 according to Embodiment 1. FIG. The figure shown in order to demonstrate the mixed injection member 50 which concerns on Embodiment 1. FIG. 1 is a perspective view of a connection adapter 100 according to Embodiment 1. FIG. The figure shown in order to demonstrate the adapter 100 for a connection which concerns on Embodiment 1. FIG. FIG. 3 is a side view of the connection adapter 100 according to the first embodiment. AA line sectional view of Drawing 5. The perspective view of the mixed injection member main body 150 which concerns on Embodiment 1. FIG. The figure shown in order to demonstrate the mixed injection member main body 150 which concerns on Embodiment 1. FIG. The figure shown in order to demonstrate the mixed injection member main body 150 which concerns on Embodiment 1. FIG. The figure shown in order to demonstrate the mixed injection member main body 150 and connection adapter 100 which concern on Embodiment 1. FIG. The figure shown in order to demonstrate the usage method of the mixed injection member 50 (adapter 100 for a connection) which concerns on Embodiment 1. FIG. The figure shown in order to demonstrate the usage method of the mixed injection member 50 (adapter 100 for a connection) which concerns on Embodiment 1. FIG. The figure shown in order to demonstrate the usage method of the mixed injection member 50 (adapter 100 for a connection) which concerns on Embodiment 1. FIG. The figure shown in order to demonstrate the adapter 200 for connection which concerns on Embodiment 2. FIG. The figure shown in order to demonstrate the adapter 300 for connection which concerns on Embodiment 3. FIG. The figure shown in order to demonstrate the adapter 400 for connection which concerns on Embodiment 4. FIG. The figure shown in order to demonstrate the mixed injection member main body 550 which concerns on Embodiment 5. FIG.

  Hereinafter, the connection adapter, the mixed injection member, and the medical circuit of the present invention will be described based on the embodiments shown in the drawings.

[Embodiment 1]
First, the configuration of the medical circuit 1 according to the first embodiment will be described in detail with reference to FIG.
FIG. 1 is a schematic diagram of a medical circuit 1 according to the first embodiment.

  The medical circuit 1 is a blood circuit for hemodialysis, and as shown in FIG. 1, a blood processor (also referred to as a dialyzer) 10, an arterial circuit 20, a venous circuit 30, and an arterial circuit. And a mixed injection member 50 disposed in the circuit. The blood processor 10 is, for example, a hollow fiber blood processor. The arterial circuit 20 is connected to one end of the blood processor 10, and the venous circuit 30 is connected to the other end of the blood processor 10.

  The arterial circuit 20 includes tubes 21 to 24, a drip chamber 25 disposed between the tubes 21 and 22, a rolling tube 26 disposed between the tubes 22 and 23, and an end of the tube 24. And a shunt cap 27 disposed on the surface. The tube 23 is connected to a saline feed line 41 for introducing physiological saline as a priming solution into the circuit and a heparin line 42 for introducing heparin solution into the circuit. A monitor line is connected to the drip chamber 25. Between the tube 23 and the tube 24, a co-infusion member 50 for injecting a drug solution or the like into the circuit or collecting blood from the circuit is disposed.

  The venous circuit 30 includes tubes 31 and 32, a drip chamber 33 disposed between the tubes 31 and 32, and a shunt cap 34 disposed at the end of the tube 32. The drip chamber 33 is connected with a drain line 44 for discharging excess physiological saline during the priming process, and a monitor line 45.

  The shunt cap 27 of the artery-side circuit 20 and the shunt cap 34 of the vein-side circuit 30 are configured so as to be capable of male-female fitting, and perform the priming process (removal of foreign matter / air in the circuit) of the medical circuit 1. Used when.

  Next, the mixed injection member 50 according to the first embodiment will be described in detail with reference to FIG.

  FIG. 2 is a view for explaining the co-infusion member 50 according to the first embodiment. 2A is a view showing components of the mixed injection member 50, FIG. 2B is an end view of the adapter cap 60, and FIG. 2C is an end view of the crowned member 80. In FIG. 2A, a part of the adapter cap 60 and the crowned member 80 are shown in cross section.

  As shown in FIG. 2A, the co-infusion member 50 includes a co-infusion member main body 150, a connection adapter 100 for connecting a luer lock type syringe or the like to the co-infusion member main body 150, and a screw of the connection adapter 100 to be described later. The cap 60 for the adapter to be attached to the joint portion 140, the stopper member 70 for stoppering a later-described mixture injection portion 170 of the injection member main body 150, and the mixture injection with the mixture injection portion 170 being stoppered by the stopper member 70. The crown member 80 is mounted so as to cover the portion 170 from the outside.

  As shown in FIG. 2B, the adapter cap 60 is a cylindrical member provided with a spiral projection 62 on the inner peripheral surface, and can be fitted to a screw connection portion 140 described later of the connection adapter 100. It is configured. A convex portion 64 that protrudes toward the opening side of the adapter cap 60 is provided at the center portion of the adapter cap 60.

  The stopper member 70 is made of a rubber-like elastic body. As the stopper member 70, for example, silicon rubber can be suitably used.

  As shown in FIG. 2C, the crowned member 80 is a cylindrical member, and a locked portion 82 having a predetermined uneven shape is provided on the inner peripheral surface. The uneven shape of the locked portion 82 corresponds to the shape of a locking portion 172 of the mixed injection portion 170 described later, and when the crown member 80 is mounted on the mixed injection portion 170, the locking portion 172 and the locked portion 172 are locked. The part 82 can be locked.

  The mixed injection member main body 150 will be described later in detail.

  Next, the configuration of the connection adapter 100 according to the first embodiment will be described in detail with reference to FIGS.

FIG. 3 is a perspective view of the connection adapter 100 according to the first embodiment. FIG. 3A is a perspective view when the needle protection hood 120 is viewed from the front side with respect to the screw connection 140, and FIG. 3B is a screw connection with the needle protection hood 120. It is a perspective view when it sees so that the connection part 140 may become the near side.
FIG. 4 is a diagram for explaining the connection adapter 100 according to the first embodiment. FIG. 4A is a view (front view) of the connection adapter 100 with the screw connection 140 located above and the needle protection hood 120 located below, and FIG. It is the figure which deleted a part of member from the figure shown to 4 (a). In FIG. 4B, the needle tube 110 and the needle protection hood 120 that should be visible in the back of the notch 122 are omitted in order to facilitate understanding of the invention.
FIG. 5 is a side view of the connection adapter 100 according to the first embodiment.
6 is a cross-sectional view taken along line AA in FIG.

  3 to 6, the connection adapter 100 includes a needle tube 110, a substantially cylindrical needle protection hood 120 configured to cover the needle tube 110, and two fitting holes as engaged portions. 130 and a circular threaded connection 140. The needle tube 110 and the screw connection 140 are in communication (see FIG. 6).

  Two notches 122 are provided on the distal end side of the needle protection hood 120 (see FIG. 3). The two notches 122 are arranged to face each other with the needle tube 110 therebetween. When the notch 122 is viewed from the front so that the screw connection part 140 is located on the upper side and the needle protection hood 120 is located on the lower side (see FIG. 4B), a virtual plane including the central axis of the needle tube 110 is obtained. The first notch 124 is located on the right side of the notch 122 divided into two by V, and the second notch 128 is located on the left side.

The first cutout portion 124 has a cutout shape that extends from the screw connection portion 140 side toward the distal end side of the needle protection hood 120. In the connection adapter 100 according to the first embodiment, the cutout shape of the first cutout portion 124 is a semi-arch shape.
In this specification, the “half-arch shape” refers to a shape constituted by one curve having a predetermined curvature when viewed in plan.

  The cutout shape of the second cutout portion 128 is a shape in which a curve having a predetermined curvature and a straight line are combined when viewed in a plan view. The straight portion of the second notch 128 extends in a direction parallel to the central axis of the needle tube 110.

  A slit 132 having a predetermined length is provided at a position of the notch 122 on the screw connection portion 140 side.

  A plurality of ribs 134 are provided on the outer peripheral surface of the needle protection hood 120 so as to be easily gripped with a finger.

  The two fitting holes 130 are circular holes in a plan view, and are opposed to each other at a predetermined position on the distal end side of the needle protection hood 120 with the needle tube 110 interposed therebetween. The fitting hole 130 is configured to engage with a projection 190 described later of the mixed injection member main body 150 when the connection adapter 100 is connected to the mixed injection member main body 150.

  A spiral protrusion 142 is provided on the outer peripheral surface of the screw connection portion 140. When the connection adapter 100 is viewed with the screw connection portion 140 positioned on the upper side and the needle protection hood 120 positioned on the lower side (see FIG. 4), the spiral protrusion 142 has a spiral structure that rises to the right. ing.

  Each member constituting the connection adapter 100 is integrally formed by a mold. As a material constituting the connection adapter 100, for example, a plastic material such as polypropylene or polycarbonate can be suitably used. In the connection adapter 100 according to the first embodiment, for example, polypropylene is used as a material.

  Next, the structure of the mixed injection member main body 150 which concerns on Embodiment 1 is demonstrated in detail using FIGS.

FIG. 7 is a perspective view of the mixed injection member main body 150 according to the first embodiment. FIG. 7A is a perspective view of the two tube connection parts 162 and 164 when the tube connection part 162 is viewed from the front side, and FIG. 7B is a front view of the tube connection part 164 being the front side. It is a perspective view when it sees as follows.
FIG. 8 is a view for explaining the mixed injection member main body 150 according to the first embodiment. FIG. 8A is a view (front view) of the co-injection member main body 150 with the tube connection portion 162 positioned on the near side, and FIG. 8B is a view where the tube connection portion 164 is positioned on the near side. It is the figure (back view) which looked at the mixed injection member main body 150 in this way.
FIG. 9 is a view for explaining the mixed injection member main body 150 according to the first embodiment. Fig.9 (a) is a side view of the co-injection member main body 150, FIG.9 (b) is BB sectional drawing of FIG.8 (b).
FIG. 10 is a view for explaining the mixed injection member main body 150 and the connection adapter 100 according to the first embodiment. FIG. 10A shows the mixed injection member main body 150 and the connection adapter 100 so that the tube connection portion 162 is positioned on the near side in a state where the connection adapter 100 is stored in the bowl-shaped portion 182 (hereinafter referred to as an adapter storage state). FIG. 10B is a perspective view of the mixed injection member main body 150 and the connection adapter 100 with the tube connection portion 164 positioned on the near side in the adapter storage state.

  As shown in FIGS. 7 to 9, the mixed injection member main body 150 includes tube connection parts 162 and 164 configured to be connectable to the tube of the medical circuit 1, and a mixed injection part 170 communicating with the tube connection parts 162 and 164. The adapter holding part 180 that holds the connection adapter 100 and the two protrusions 190 as the engaging parts are provided.

  The tube connection parts 162 and 164 are circular tubular members, and are arranged so that the tube connection part 162 and the tube connection part 164 are positioned on a straight line. The tube connection portion 162 on one side is connected to the end portion of the tube 23 of the artery side circuit 20 shown in FIG. 1, and the tube connection portion 164 on the other side is also connected to the end portion of the tube 24 of the artery side circuit 20. It is connected.

  The mixed injection part 170 is a tubular member, and a locking part 172 is provided in the vicinity of the opening. The locking portion 172 of the mixed injection portion 170 and the locked portion 82 of the crowned member 80 are configured to be locked with each other. The mixed injection part 170 is arranged so that the tube axis of the mixed injection part 170 is orthogonal to the tube axis of the tube connection parts 162 and 164.

  The adapter holding portion 180 includes a hook-shaped portion 182 having a hook shape (substantially U-shaped cross section), a tubular needle tube storage portion 184 disposed inside the hook-shaped portion 182, and a substantially plate that supports the needle tube storage portion 184. And a plurality of ribs 188 provided on the outer surface of the hook-shaped portion 182. By providing the plurality of ribs 188, the mixed injection member main body 150 can be easily held with a finger.

  As shown in FIGS. 7 and 9B, the hole of the needle tube storage portion 184 is open toward the tube connection portion 162 side. Further, the thickness of the support portion 186 corresponds to the slit width of the slit 132 provided in the connection adapter 100. The needle tube 110 of the connection adapter 100 is inserted into the hole of the needle tube storage portion 184, and the support portion 186 is fitted into the slit 132, so that the connection is made in the hook-shaped portion 182 as shown in FIG. The adapter 100 can be stored.

  The protrusion 190 is a rod-shaped member having a circular cross section, and is provided at the base portion between the tube connecting portions 162 and 164 and the mixed injection portion 170. The protrusion 190 has a function of maintaining the connection state when the connection adapter 100 is connected to the mixed injection member main body 150. The protrusion height of the protrusion 190 is a height that can be fitted into the fitting hole 130 of the connection adapter 100 when the connection adapter 100 is connected to the mixed injection member main body 150.

  Each member constituting the mixed injection member main body 150 is integrally formed by a mold. As a material constituting the mixed injection member main body 150, for example, a plastic material such as polycarbonate, polyvinyl chloride, and ABS (acrylonitrile-butadiene-styrene) resin can be suitably used. In the mixed injection member main body 150 according to the first embodiment, for example, polycarbonate is used as a material.

  Next, a method for connecting a luer lock type syringe to the mixed injection member 50 (mixed injection member main body 150) and a method for removing the luer lock type syringe from the mixed injection member 50 (mixed injection member main body 150) will be described with reference to FIGS. Will be described in detail. In the following description, a Luer lock syringe 90 filled with a chemical solution will be described as an example.

FIGS. 11-13 is a figure shown in order to demonstrate the usage method of the co-infusion member 50 (adapter 100 for a connection) which concerns on Embodiment 1. FIG. FIG. 11A is a diagram showing the connection adapter 100 housed in the bowl-shaped portion 182 of the mixed injection member main body 150, and FIG. 11B is a diagram for the adapter from the connection adapter 100 shown in FIG. FIG. 11C is a diagram illustrating a state before the cap 60 is removed, and FIG. 11C is a diagram illustrating a state before the luer lock portion 92 of the luer lock syringe 90 is connected to the screw connection portion 140. ) Is a view showing a state after the luer lock portion 92 is connected to the screw connection portion 140. In addition, in FIG. 11 (a)-FIG.11 (d), in order to make an understanding of invention easy, a part (portion part 182 part) of the mixed injection member main body 150 is notched and shown in figure. 11 (a) to 11 (c), a part of the connection adapter 100 (needle protection hood 120 and the like) is illustrated in cross section, and in FIG. 11 (c), the luer of the luer lock type syringe 90 is illustrated. A portion of the lock portion 92 is shown in cross section. 12A is a view showing a state before the luer lock type syringe 90 is connected to the mixed injection member main body 150, and FIG. 12B is a state when the luer lock type syringe 90 is connected to the mixed injection member main body 150. FIG. 12 (c) is a diagram showing a state in which the chemical liquid filled in the luer lock type syringe 90 is injected. FIG. 13 (a) is a view showing a state when the luer lock type syringe 90 is removed from the mixed injection member main body 150, and FIG. 13 (b) is an enlarged view of the main part of FIG. 13 (a). 13 (c) is a view showing a state after the luer lock type syringe 90 is removed from the mixed injection member main body 150. FIG.
In addition, in FIGS. 11-13, illustration of the tubes 23 and 24 (refer FIG. 1) connected to the tube connection parts 162 and 164 of the mixed injection member main body 150 is abbreviate | omitted.

  In connecting the luer lock type syringe 90 to the mixed injection member 50, first, the adapter cap 60 is removed from the connection adapter 100 housed in the bowl-shaped portion 182 of the mixed injection member main body 150 (FIG. 11A and FIG. 11 (b).)

  Next, as shown in FIG. 11C, while rotating the luer lock syringe 90 with respect to the connection adapter 100, the luer lock portion 92 of the luer lock syringe 90 is connected to the screw connection portion 140, The connection adapter 100 is removed from the mixed injection member main body 150 together with the luer lock type syringe 90 (see FIG. 11D).

  Next, the needle tube 110 of the connection adapter 100 is punctured from the vertical direction with respect to the stopper member 70 (see FIG. 2 for the stopper member 70) arranged in the mixture injection portion 170 of the injection member main body 150, The connection adapter 100 and the mixed injection member main body 150 are connected (see FIGS. 12A and 12B). At this time, when the needle tube 110 is punctured into the stopper member 70 to a position where the fitting hole 130 and the protrusion 190 are engaged, the protrusion 190 is fitted into the fitting hole 130 and a “click” sound is generated. The needle tube 110 and the tube connecting portions 162 and 164 are in communication with each other inside the member main body 150. That is, the tubes 23 and 24 of the medical circuit 1 and the luer lock syringe 90 are connected via the mixed injection member 50. When the connection adapter 100 and the mixed injection member main body 150 are completely connected, as shown in FIG. 12C, when the piston portion 94 of the luer lock syringe 90 is pushed, the luer lock syringe 90 is filled. The medicinal solution is injected into the medical circuit 1.

When removing the luer lock type syringe 90 from the mixed injection member main body 150, as shown in FIG. 13A, the luer lock type syringe 90 (and the connection adapter 100) is rotated clockwise with respect to the mixed injection member main body 150. Let Then, as shown in FIG.13 (b), the outer peripheral surface of the tube connection part 162 and the 1st notch part 124 contact. At this time, in addition to the outer peripheral surface of the tube connection portion 162 being a curved surface, the notch shape of the first notch portion 124 extends from the screw connection portion 140 side toward the distal end side of the needle protection hood 120. Therefore, when the luer lock type syringe 90 (and the connection adapter 100) is gradually rotated, the first notch portion 124 becomes the tube connection portion 162 (the tube on the opposite side) along with the rotation operation. The same applies to the connection portion 164.), and the connection adapter 100 is gradually pushed up in the extraction direction (the direction of the straight arrow shown in FIG. 13A). Further, when the luer lock syringe 90 (and the connection adapter 100) is rotated clockwise, as shown in FIGS. 13 (a) and 13 (b), the notch 122 in the distal end side of the needle protection hood 120 is provided. As a result, the engagement state between the protrusion 190 and the fitting hole 130 is released.
By the above operation, as shown in FIG. 13C, the luer lock syringe 90 can be removed from the mixed injection member main body 150 relatively easily.

  Here, taking as an example a Luer-lock syringe 90 filled with a chemical solution, a method of connecting a Luer-lock syringe to the mixed injection member 50 (mixed injection member main body 150) and a Luer lock from the mixed injection member 50 (mixed injection member main body 150). Although the method of removing the type syringe has been described, the same applies to the method of connecting or removing the luer lock type syringe for blood collection.

  According to the connection adapter 100 according to the first embodiment configured as described above, since the needle protection hood 120 is provided so as to cover the needle tube 110, it is possible to suppress the occurrence of false puncture. Further, since the notch 122 is provided on the distal end side of the needle protection hood 120, interference of the needle protection hood 120 at the time of connection can be prevented. Furthermore, since the screw connection part 140 is provided, it can be suitably connected to the luer lock syringe 90 or the like.

  Further, according to the connection adapter 100 according to the first embodiment, the first cutout portion 124 has a cutout shape that extends from the screw connection portion 140 side toward the distal end side of the needle protection hood 120. When the connection adapter 100 is rotated in the direction in which the portion having the notch shape comes into contact with the tube connecting portions 162 and 164, the portion having the notch shape is connected to the tube connecting portions 162 and 164 in accordance with the rotation operation. The connection adapter 100 gradually moves in the extraction direction on the outer peripheral surface. As a result, the force required to pull out the connection adapter 100 can be smaller than that of the prior art, and the ease of removal can be improved as compared with the prior art.

  Therefore, the connection adapter 100 according to the first embodiment is a connection adapter that can be connected to a luer lock syringe or the like, and prevents interference of the needle protection hood at the time of connection while suppressing the occurrence of false puncture. Thus, the connection adapter can be removed more easily than before.

  In the connection adapter 100 according to the first embodiment, when the notch 122 is viewed from the front as shown in FIG. 4, the first notch 124 is located on the right side with respect to the virtual plane V, and is not screwed. A spiral protrusion 142 that rises to the right is provided on the outer peripheral surface of the joint portion 140. Further, the first cutout portion 124 has a cutout shape that extends from the screw connection portion 140 side toward the distal end side of the needle protection hood 120. Thus, by rotating the luer lock syringe 90 clockwise with respect to the mixed injection member main body 150, the screw connection between the luer lock portion 92 and the screw connection portion 140 is not released, but is connected from the mixed injection member main body 150. The adapter 100 can be removed relatively easily.

By the way, when the connection adapter 100 to which the luer lock syringe 90 is connected is connected to the mixed injection member main body 150, the luer lock syringe 90 (and the connection) is removed when the connection adapter 100 is removed from the mixed injection member main body 150. It is an important key to rotate the adapter 100) clockwise or counterclockwise with respect to the mixed injection member main body 150. This is because the connection state between the luer lock syringe 90 and the connection adapter 100 is released when the luer lock syringe 90 is rotated counterclockwise with respect to the connection adapter 100. That is, when removing the connection adapter 100 from the mixed injection member main body 150, if the luer lock syringe 90 (and the connection adapter 100) is rotated counterclockwise with respect to the mixed injection member main body 150, the connection adapter 100 is removed. In this case, an undesirable situation may occur in which the connection between the luer lock syringe 90 and the connection adapter 100 is released instead of the connection with the mixed injection member main body 150.
With respect to such a problem, in the connection adapter 100 according to the first embodiment, the cutout shape of the second cutout portion 128 is a curve and a straight line having a predetermined curvature when viewed in plan as described above. The shape is a combination of. In other words, since there is a straight portion (a straight line extending in a direction parallel to the central axis of the needle tube 110) in the second cutout portion 128, when removing the luer lock type syringe 90 from the mixed injection member main body 150, the lure lock type is temporarily assumed. Even if the syringe 90 (and the connection adapter 100) is to be rotated counterclockwise with respect to the mixed injection member main body 150, the rotation operation is restricted. As a result, it is possible to suppress the occurrence of an undesirable situation in which the connection between the luer lock syringe 90 and the connection adapter 100 is released as much as possible.

  In the connection adapter 100 according to the first embodiment, the cutout shape of the first cutout portion 124 is a semi-arch shape. Thereby, the movement to the extraction direction of the connection adapter 100 according to the rotation operation | movement of the connection adapter 100 is realizable reliably.

  In the connection adapter 100 according to the first embodiment, two notches 122 are provided on the distal end side of the needle protection hood 120, and the two notches 122 are disposed to face each other with the needle tube 110 therebetween. . Thereby, in connecting with the mixed injection member main body 150 arrange | positioned in the middle of a line, it becomes a thing especially suitable.

  In the connection adapter 100 according to the first embodiment, since the slit 132 is provided at the position of the notch 122 on the screw connection portion 140 side, the lure is in the state shown in FIGS. 13A and 13B. When the lock syringe 90 (and the connection adapter 100) is rotated, the tip portion of the needle protection hood 120 becomes easier to open. As a result, the ease of removal can be further improved.

  Since the mixed injection member 50 according to the first embodiment includes the above-described excellent connection adapter 100, it is a mixed injection member that can be connected to a luer lock syringe or the like, and suppresses the occurrence of false puncture while connecting. In this case, it is possible to prevent the needle protection hood from interfering with, and it becomes a co-infusion member that is easier to remove than the conventional one.

  In the mixed injection member 50 according to the first embodiment, the mixed injection member main body 150 is provided with a protrusion 190 as an engaging portion that maintains the connection state when the connection adapter 100 is connected to the mixed injection member main body 150. The connection adapter 100 is provided with a fitting hole 130 as an engaged portion that can be engaged with the protrusion 190 when the connection adapter 100 is connected to the mixed injection member main body 150. Thereby, it becomes possible to suppress an undesirable disconnection when the connection adapter 100 is connected to the mixed injection member main body 150. Further, the connection state between the connection adapter 100 and the mixed injection member main body 150 can be maintained with a relatively simple configuration of the protrusion and the fitting hole. Further, in the case of the combination of the protrusion and the fitting hole, when the connection adapter 100 is rotated to remove the connection adapter 100, the engagement state between the protrusion 190 and the fitting hole 130 needs a large force. It is possible to cancel without Furthermore, although it differs depending on the material of the connection adapter 100 and the mixed injection member main body 150, since a “click” sound is generated at the moment when the protrusion 190 is fitted into the fitting hole 130, the connection adapter 100 and the mixed injection member are used. It becomes possible to recognize more clearly that the connection with the main body 150 is completed.

  In the mixed injection member 50 according to the first embodiment, the connection adapter 100 is made of a plastic material. As a result, when the connection adapter 100 is rotated to remove the connection adapter 100, the engagement state between the protrusion 190 and the fitting hole 130 can be released without requiring a great force.

  Since the medical circuit 1 according to the first embodiment includes the excellent mixed injection member 50 described above, it is possible to connect a luer-lock syringe or the like, and prevent false puncture when connecting a luer-lock syringe or the like. In addition, the medical circuit is excellent in connectivity with a mixed injection member and excellent in ease of removal when disconnecting from a luer lock syringe or the like.

[Embodiments 2 to 4]
FIG. 14 is a diagram for explaining the connection adapter 200 according to the second embodiment. FIG. 14A is a view (front view) of the connection adapter 200 with the screw connection portion 240 positioned on the upper side and the needle protection hood 220 positioned on the lower side, and FIG. It is the figure which deleted a part of member from the figure shown to 14 (a).
FIG. 15 is a diagram for explaining the connection adapter 300 according to the third embodiment. FIG. 15A is a view (front view) of the connection adapter 300 with the screw connection 340 positioned on the top and the needle protection hood 320 positioned on the bottom (FIG. 15B). It is the figure which deleted a part of member from the figure shown to 15 (a).
FIG. 16 is a diagram for explaining the connection adapter 400 according to the fourth embodiment. FIG. 16A is a view (front view) of the connection adapter 400 with the screw connection 440 positioned on the top and the needle protection hood 420 positioned on the bottom (FIG. 16B). It is the figure which deleted a part of member from the figure shown to 16 (a).
14 (b) to 16 (b), in order to facilitate understanding of the invention, the needle tubes 210 to 410 and the needle protection hoods 220 to 420 that should be visible behind the notches 222 to 422 are deleted. It is illustrated.

  The connection adapters 200 to 400 according to the second to fourth embodiments basically have a configuration similar to that of the connection adapter 100 according to the first embodiment, but the shape of the notch is the connection adapter according to the first embodiment. 100 is different.

In the connection adapter 200 according to the second embodiment, as shown in FIG. 14, the notch 222 includes a first notch 224 positioned on the right side with respect to the virtual plane V and a left side with respect to the virtual plane V. It is comprised from the 2nd notch part 228 located.
The cutout shape of the first cutout portion 224 is a shape that widens from the screw connection portion 240 side toward the distal end side of the needle protection hood 220, and specifically, the first cutout portion 224 is located on the screw connection portion 240 side. The first curved surface portion 225 and the second curved surface portion 226 located on the distal end side of the needle protection hood 220 are combined. The shape of the first curved surface portion 225 is a semi-arch shape, and is a shape along the outer peripheral surface of the tube connecting portions 162 and 164 described in the first embodiment. In other words, “the shape along the outer peripheral surface of the tube connecting portions 162 and 164” means that the curvature of the portion corresponding to the first curved surface portion 225 in the outer peripheral surface of the tube connecting portions 162 and 164 is substantially the same. A shape composed of a curved line consisting of The shape of the second curved surface portion 226 is a shape in which a curve having a predetermined curvature and a straight line are combined when viewed in plan. The straight portion of the second curved surface portion 226 extends in a direction parallel to the central axis of the needle tube 210.
The cutout shape of the second cutout portion 228 is a shape in which a curve having a predetermined curvature and a straight line are combined when viewed in plan. The straight portion of the second notch 228 extends in a direction parallel to the central axis of the needle tube 210.

In the connection adapter 300 according to the third embodiment, as shown in FIG. 15, the notch 322 includes a first notch 324 positioned on the right side with respect to the virtual plane V and a left side with respect to the virtual plane V. It is comprised from the 2nd notch part 328 located.
The cutout shape of the first cutout portion 324 is a shape that widens from the screw connection portion 340 side toward the distal end side of the needle protection hood 320, and specifically, a curved surface located on the screw connection portion 340 side. This is a shape in which the portion 325 and the linear portion 326 located on the distal end side of the needle protection hood 320 are combined. The shape of the curved surface portion 325 is a semi-arch shape, and is a shape along the outer peripheral surface of the tube connecting portions 162 and 164 described in the first embodiment. The shape of the straight portion 326 is a shape that is inclined so as to spread from the boundary portion with the curved surface portion 325 toward the distal end side of the needle protection hood 320.
The notch shape of the second notch 328 is the same shape as the second notch 228 described in the second embodiment.

In the connection adapter 400 according to the fourth embodiment, as shown in FIG. 16, the notch 422 includes a first notch 424 positioned on the right side of the virtual plane V and a left side of the virtual plane V. It is comprised from the 2nd notch part 428 located.
The cutout shape of the first cutout portion 424 is a shape that widens from the screw connection portion 440 side toward the distal end side of the needle protection hood 420, and specifically, the first cutout portion 424 is located on the screw connection portion 440 side. The first straight portion 425 and the second straight portion 426 located on the distal end side of the needle protection hood 420 are combined. The first straight portion 425 has a straight shape and extends in a direction orthogonal to the virtual plane V. The shape of the second straight portion 426 is a straight shape that is inclined so as to spread from the boundary portion with the first straight portion 425 toward the distal end side of the needle protection hood 420.
The notch shape of the second notch 428 is the same shape as the second notch 228 described in the second embodiment.

  In addition, members other than the notches 222 to 422 (the portions excluding the notches 222 to 422 of the needle tubes 210 to 410 and the needle protection hoods 220 to 420, the fitting holes 230 to 430, the slits 232 to 432, the ribs 234 to 434, The screw connection portions 240 to 440) have some differences such as a small number of ribs 234 to 434, but basically have the same configuration and function as the members described in the first embodiment. Detailed description will be omitted.

As described above, the connection adapters 200 to 400 according to the second to fourth embodiments are different from the connection adapter 100 according to the first embodiment in the shape of the notches (first notch portions). Since the needle protection hoods 220 to 420 are provided so as to cover them, the occurrence of false puncture can be suppressed as in the case of the connection adapter 100 according to the first embodiment. Further, since the notches 222 to 422 are provided on the tip side of the needle protection hoods 220 to 420, the interference of the needle protection hoods 220 to 420 at the time of connection is prevented as in the case of the connection adapter 100 according to the first embodiment. Can be prevented. Further, since the screw connection portions 240 to 440 are provided, it can be suitably connected to a luer lock type syringe or the like as in the case of the connection adapter 100 according to the first embodiment. Moreover, since the notch shape of the 1st notch part 224-424 is a shape which spreads toward the front end side of the needle | hook protection hood 220-420 from the screwing connection part 240-440 side, it is for connection concerning Embodiment 1. As in the case of the adapter 100, the force required to pull out the connection adapters 200 to 400 is smaller than that of the conventional one, and the ease of removal can be improved as compared with the conventional case.
Therefore, the connection adapters 200 to 400 according to the second to fourth embodiments are connection adapters that can be connected to a luer-lock syringe or the like, and the interference of the needle protection hood at the time of connection while suppressing the occurrence of false punctures. Thus, the connection adapter can be removed more easily than before.

  The connection adapters 200 to 400 according to the second to fourth embodiments have the same configuration as the connection adapter 100 according to the first embodiment except that the shape of the notch (first notch portion) is different. It has the corresponding effect as it is among the effects of the connection adapter 100 according to the first aspect.

[Embodiment 5]
FIG. 17 is a view for explaining the mixed injection member main body 550 according to the fifth embodiment. FIG. 17A is a view (front view) of the mixed injection member main body 550 when the tube connecting portion 562 is positioned on the near side, and FIG. 17B is a side view of the mixed injection member main body 550.

  The mixed injection member main body 550 according to the fifth embodiment basically has a configuration similar to the mixed injection member main body 150 according to the first embodiment, but the configuration of the protruding portion is different from the mixed injection member main body 150 according to the first embodiment. .

That is, in the mixed injection member main body 550 according to the fifth embodiment, as shown in FIG. The collar portion 592 is a substantially circular collar-shaped member provided along the outer surface of a part of the protrusion 592 (near the tip).
Although the detailed description by illustration is omitted, the collar portion 592 comes into contact with the inner surface of the needle protection hood 120 at the portion where the fitting hole 130 is provided when the connection adapter 100 is connected to the mixed injection member main body 550. The projection 590 is provided at a position slightly away from the tip.

  The members other than the collar portion 592 have the same configuration and function as the members of the mixed injection member main body 150 described in the first embodiment, and thus detailed description thereof is omitted.

  Since the mixed injection member main body 550 according to the fifth embodiment includes the above-described collar portion 592, when the connection adapter 100 is connected to the mixed injection member main body 550, the needle protection hood 120 is attached to the inner surface by the collar portion 592. It becomes possible to support from. As a result, it is possible to prevent the connection adapter 100 from being inclined when the mixed injection member main body 550 and the connection adapter 100 are connected.

  As described above, the connection adapter, the mixed injection member, and the medical circuit of the present invention have been described based on each of the above embodiments, but the present invention is not limited to each of the above embodiments, and does not depart from the gist of the present invention. Can be implemented in various modes, and for example, the following modifications are possible.

(1) In each of the above-described embodiments, the first notch has a notch shape that extends from the screw connection part side toward the tip side of the needle protection hood. Although each shape of the 1st notch parts 124-424 in 1-4 was illustrated and demonstrated, this invention is not limited to this. If the connection adapter moves in the extraction direction in accordance with the rotation operation of the connection adapter, the cutout shape may be another shape (for example, a shape in which three or more curves are combined). Good.

(2) In each of the above embodiments, the case where only the first notch portion has a notch shape extending from the screw connection portion side toward the distal end side of the needle protection hood has been described as an example. Is not limited to this. Only the second cutout portion may have a cutout shape extending from the screw connection portion side toward the tip end side of the needle protection hood, or both the first cutout portion and the second cutout portion are In addition, it may have a notch shape that widens from the screw connection part side toward the tip side of the needle protection hood. In the former case, it is preferable that the spiral protrusion provided on the outer peripheral surface of the threaded connection portion is raised to the left.

(3) In each of the above embodiments, two notches are provided on the distal end side of the needle protection hood, and the two notches have been described by way of example as opposed to each other with a needle tube in between. However, the present invention is not limited to this. For example, one or three or more notches may be provided on the tip side of the needle protection hood. Alternatively, two cutouts are provided on the distal end side of the needle protection hood, but they are not disposed to face each other with the needle tube in between, and may be disposed, for example, in a positional relationship of 90 degrees around the needle tube. . That is, the number and arrangement position of the notches provided on the distal end side of the needle protection hood may be appropriately changed according to the shape of the mixed injection member main body.

(4) In each of the above embodiments, the case where the protrusion as the engaging portion is a rod-shaped member having a circular cross section and the fitting hole as the engaged portion is a circular hole in plan view is described as an example. However, the present invention is not limited to this. For example, the projection is a square bar member having a polygonal cross section, and the fitting hole is a polygonal hole corresponding to the cross sectional shape of the projection. Good. Moreover, in each said embodiment, although the case where two protrusions were provided in the mixed injection member main body and two fitting holes were provided in the connection adapter was demonstrated and demonstrated, this invention is limited to this. One or three or more protrusions and fitting holes may be provided. Moreover, in each said embodiment, although the engaging part was protrusion and the case where the to-be-engaged part was a fitting hole was illustrated and demonstrated, this invention is not limited to this. As long as the connection adapter can be maintained when the connection adapter is connected to the mixed injection member main body, the engaging portion and the engaged portion may be made of other known means.

(5) In the fifth embodiment, the case where the collar portion 592 is a substantially circular collar-shaped member has been described as an example. However, the present invention is not limited to this and is formed of other shapes. May be. In the fifth embodiment, the collar 592 is located at a position in contact with the inner surface of the needle protection hood 120 where the fitting hole 130 is provided when the connection adapter 100 is connected to the mixed injection member main body 550. Although provided, the present invention is not limited to this. When the connection adapter 100 is connected to the mixed injection member main body 550, the inner surface of the needle protection hood 120 and the collar portion 592 do not necessarily have to be in contact with each other.

(6) In each of the above embodiments, the case where each member constituting the connection adapter is integrally formed by a mold has been described, but the present invention is not limited to this. For example, after each member constituting the connection adapter is individually created, the members may be joined. Similarly, the mixed injection member main body is not limited to one integrally formed by a mold, and may be one obtained by joining the respective members.

(7) In each of the above embodiments, polypropylene is used as the material for the connection adapter, and polycarbonate is used as the material for the mixed injection member body. However, the present invention is not limited to this, and other plastic materials are used. May be.

(8) In the first embodiment, the case where the mixed injection member 50 is disposed in a part of the artery side circuit 20 (between the rolling tube 26 and the shunt cap 27) has been described as an example. However, the co-infusion member of the present invention may be disposed at another position of the artery-side circuit 20 or at the vein-side circuit 30. The mixed injection member of the present invention may be used for a blood circuit having a circuit configuration different from that of the medical circuit 1 described above, or a blood circuit other than for hemodialysis (for example, a blood circuit for plasma separation or an artificial heart lung machine). For use in blood circuits, etc.) and infusion circuits.

DESCRIPTION OF SYMBOLS 1 Medical circuit 10 Blood processor 20 Arterial circuit 21-24, 31, 32 Tube 25, 33 Drip chamber 26 Rolling tube 27, 34 Shunt cap 30 Vein side circuit 41 Saline line 42 Heparin line 43, 45 Monitor line 44 Exhaust Liquid line 50 Mixed injection member 60 Adapter cap 62 (Adapter cap) spiral projection 64 (Adapter cap) convex portion 70 Plug stop member 80 Crowned member 82 (Crown member) Locked portion 90 Luer lock Type syringe 92 Luer lock part 94 Piston part 100,200,300,400 Adapter 110,210,310,410 for connection 110,220,320,420 Needle protection hood 122,222,322,422 Notch 124,224 324, 424 First notch 128, 2 8, 328, 428 Second notch 130, 230, 330, 430 Fitting hole 132, 232, 332, 432 Slit 134, 234, 334, 434 (needle protection hood) rib 140, 240, 340, 440 Screw Joint connection part 142,242,342,442 (Screw connection part) Helical projection 150,550 Mixed injection member main body 162,164,562,564 Tube connection part 170,570 Mixed injection part 172,572 (of mixed injection member main body) Locking portion 180, 580 Adapter holding portion 182, 582 Sponge portion 184, 584 Needle tube storage portion 186, 586 Support portion 188, 588 Rib 190, 590 Protrusion 225 First curved surface portion 226 Second curved surface portion 325 Curved surface portion 326 Straight line portion 425 First straight line portion 426 Second straight line portion 592 Collar portion V Virtual plane

Claims (9)

A needle tube (110);
A needle protection hood (120) configured to cover the needle tube (110) and provided with at least one notch (122) on the distal end side;
Communicating with the needle tube (110), comprising a tubular threaded connection (140),
When the cutout (122) is divided into two along a virtual plane (V) including the central axis of the needle tube, the cutout portion on one side is defined as a first cutout portion (124), and the cutout on the other side is formed. The notch portion is a second notch portion (128), and the notch (122) is viewed from the front so that the screw connection portion (140) is located above and the needle protection hood (120) is located below. When I saw it
The first notch (124) is located on the right side with respect to the virtual plane (V), and the second notch (128) is located on the left side with respect to the virtual plane (V).
On the outer peripheral surface of the screw connection part (140), a spiral protrusion (142) that rises to the right is provided,
The first cutout part (124) has a cutout shape that extends from the screw connection part (140) side toward the tip side of the needle protection hood (120),
Unlike the cutout shape of the first cutout portion (124), the second cutout portion (128) has a curve having a predetermined curvature when viewed in plan and the central axis of the needle tube (110). The connection adapter (100), wherein the connection adapter (100) has a shape combined with a straight line extending in a direction parallel to the line . The connection adapter according to claim 1,
The connection adapter (100) , wherein the notch shape is a semi-arch shape . The connection adapter according to claim 1 ,
The notch shape is a combination of a first curved surface portion (225) positioned on the screw connection portion (240) side and a second curved surface portion (226) positioned on the distal end side of the needle protection hood (220). Shape
The connection adapter (200), wherein the first curved surface portion (225) has a semi-arch shape. The connection adapter according to claim 1 ,
The notch shape is a combination of a curved surface portion (325) located on the screw connection portion (340) side and a straight portion (326) located on the tip side of the needle protection hood (320). ,
The curved surface portion (325) has a semi-arch shape,
The connecting adapter (300) characterized in that the straight portion (326) has a shape inclined so as to spread from the boundary portion with the curved surface portion (325) toward the distal end side of the needle protection hood (320). ). The connection adapter according to claim 1 ,
The notch shape is a shape including a straight portion inclined so as to spread from the screw connection portion (440) side toward the tip end side of the needle protection hood (420). 400). In the connection adapter according to any one of claims 1 to 5 ,
Two notches (122) are provided on the tip side of the needle protection hood (120),
The connection adapter (100), wherein the two notches (122) are arranged to face each other with the needle tube (110) in between. A co-infusion member body (150) configured to be disposed in a medical circuit;
The connection adapter (100) according to any one of claims 1 to 6,
The mixed injection member main body (150)
A tube connection portion (162, 164) configured to be connectable to the tube of the medical circuit;
A mixed injection part (170) communicating with the tube connection part (162, 164);
An infusion member (50) having an adapter holding part (180) for holding the connection adapter (100). The mixed injection member according to claim 7,
The mixed injection member main body (150) is provided with an engaging portion that maintains the connection state when the connection adapter (100) is connected to the mixed injection member main body (150).
The connecting adapter (100) is provided with an engaged portion that can be engaged with the engaging portion when the connecting adapter (100) is connected to the mixed injection member main body (150). Mixed injection member (50) characterized by the above. A medical circuit (1) comprising the mixed injection member (50) according to claim 7 or 8.