JP2022073110A - Simulated blood vessel for injection training - Google Patents

Abstract

To provide a simulated blood vessel which lowers manufacturing costs by suppressing a number of components, while allowing injection practice of various modes to be performed, and further, which has been downsized in order to not become an obstacle in pressing a simulated blood bag.SOLUTION: In a simulated blood vessel 1, a simulated blood bag 2 filled with simulated blood is connected to a tubular blood vessel part 3 using a connection fixing part 4, and it is a simulated blood vessel for injection training intended for conducting injection training in a state that the blood vessel part 3 is tensioned by pressing the simulated blood bag 2. The connection fixing part 4 includes an adapter attached to one end of the blood vessel part 3, and a connector 6 which encloses the adapter and connects and fixes it to the simulated blood bag 2. The adapter has an outer cylinder, an inner cylinder, and a space which connects an open end being one end of the blood vessel part 3 between the outer cylinder and the inner cylinder. The connector 6 has a protrusion engaging part which tightens a holding state of the adapter and the blood vessel part 3, in a state that the adapter is enclosed.SELECTED DRAWING: Figure 1

Description

The present invention provides a state close to the actual feeling of injection when medical personnel such as doctors, nurses, midwives, public health nurses, clinical laboratory technicians, paramedics, and nursing students practice and practice various injection-related techniques. It is an invention relating to a simulated blood vessel for training to reproduce and improve the practice effect.

Injection is an indispensable technique for medical personnel, and its lack of skill immediately causes patient pain. However, the improvement of injection technique has largely depended on the accumulation of experience of each medical person, and it has been difficult to carry out effective training.

In Patent Document 1, a simulated blood vessel is arranged on a simulated subcutaneous tissue layer attached to a mounting body, the simulated subcutaneous tissue layer and the simulated blood vessel are covered with a simulated skin layer, and the mounting body is attached to an arm for actual injection. An injection practice tool that reproduces a state close to the sensation is disclosed. The simulated blood vessel is formed by connecting one end to a simulated blood bag that stores simulated blood.

Japanese Unexamined Patent Publication No. 2019-152770

Since the injection practice tool of Patent Document 1 is in a closed state in which the simulated blood vessel and the simulated blood bag are sealed, blood sampling training for extracting the simulated blood can be performed, but a drug solution such as intravenous drip administration or a saline solution should be added to the simulated blood vessel. It is difficult to practice the procedures related to administration. As for the injection practice, it was desired that the administration training could be selectively performed in addition to the blood sampling training. Furthermore, it was necessary to practice with blood vessels of different diameters (thicknesses) for the simulated blood bag, and various training forms were required. If these were molded separately, the cost would increase, and there was a demand for simulated blood vessels and injection training tools that could be used in various training forms with a single member.

Furthermore, the simulated blood vessel is premised on pressing and using the simulated blood bag in preparation for the injection practice tool, and if the member connecting the simulated blood vessel and the simulated blood bag becomes large, it will be an obstacle to proper pressing. Therefore, there has been a demand for a connection form that is as compact as possible.

Therefore, the present invention aims to reduce the number of parts and reduce the manufacturing cost while being able to perform injection training in various modes, and further, the simulated blood bag is miniaturized so as not to interfere with the pressing. The purpose is to provide blood vessels.

In the simulated blood vessel of the present invention, a simulated blood bag filled with simulated blood and a tubular blood vessel portion are connected by a connecting fixing portion, and injection practice is performed in a state where the simulated blood bag is pressed and the blood vessel portion is tense. A simulated blood vessel for practice of injection, wherein the connecting and fixing portion has an adapter attached to one end of the blood vessel portion and a connector that encloses the adapter and connects to and fixes the simulated blood bag. The adapter has a space for connecting the outer cylinder, the inner cylinder, and the open end, which is one end of the blood vessel portion, between the outer cylinder and the inner cylinder, and the connector contains the adapter. In the state, it is characterized by having a protruding locking portion that tightens the holding state between the adapter and the blood vessel portion.

Further, the simulated blood bag has an outflow tube fixed to and connected to the connector of the connection fixing portion, and the adapter has an adapter base end portion having an inclined surface for positioning the insertion state into the outflow tube. It has an outer cylinder and an inner cylinder that extend further in the tip direction from the tip position of the adapter base end portion, and the outer cylinder has a plurality of slits divided in the circumferential direction, and each divided outer cylinder is provided. The cylinder has a tapered shape that tapers from the base end to the tip, and the connector has a cap shape having an outer wall and a bottom screwed to the outflow cylinder, and has a through hole for leading out a blood vessel portion to the bottom portion. When the connector is fixed to the outflow cylinder while the connector has a protruding locking portion that protrudes from the bottom portion in a tapered shape and the connector includes the adapter, the protruding locking portion becomes the outflow cylinder. It is preferable to insert the outer cylinder between the inner surface of the outer cylinder and the surface of the outer cylinder to tighten the outer cylinder inward.

Further, the outflow tube of the simulated blood bag has a locking portion having a ridge shape protruding from the surface of the outflow tube on the proximal end side of the threaded portion, and the connector has a concave edge on the proximal end side of the outer wall. It is preferable that the locked portion has a locked portion, and the protruding locking portion is located in the recess of the locked portion in a state where the connector is screwed into the simulated blood bag and fixed.

Further, for injection practice, a simulated blood bag filled with simulated blood and one end of a tubular blood vessel portion are connected by a connecting fixing portion, and the other end of the blood vessel portion is connected to a drainage tubular object by a drainage connecting portion. The discharge connection portion is a simulated blood vessel of the above, and the discharge connection portion includes a second adapter attached to the other end of the blood vessel portion, and a second connector that includes the second adapter and connects and fixes it to the discharge cylinder-shaped object. The second adapter comprises an adapter base end having an inclined surface, an outer cylinder extending from the tip position of the adapter base end, an inner cylinder, and between the outer cylinder and the inner cylinder. The outer cylinder has a space for connecting the open ends of the blood vessel portions, the outer cylinder has a plurality of slits divided in the circumferential direction, and each divided outer cylinder is tapered from the base end to the tip. The second connector has a shape and has a cap shape having an outer wall and a bottom screwed to the discharge cylinder, and has a through hole for leading out the blood vessel portion to the bottom portion and a taper from the bottom portion. The protruding locking portion has a protruding locking portion that protrudes in a shape, and the protruding locking portion includes the inner surface of the discharge cylinder and the surface of the outer cylinder in a state where the second connector includes the second adapter. It is preferable to maintain the attached state of the second adapter and the blood vessel portion by inserting the outer cylinder between the two and tightening the outer cylinder inward.

Further, it has an intermediate connecting member which is a discharge cylinder-shaped object connected to the discharge connecting portion and a connecting member further connected to the intermediate connecting member, and the intermediate connecting member has an internal discharge flow path and the discharge flow. It has a shielding valve that closes the path, a threaded portion that connects to the second connector of the discharge connecting portion, and a threaded portion that connects to the connecting member, and the connecting member penetrates the shielding valve. It has a communication needle that irreversibly switches from a closed state to an open state, and the communication needle consists of a cylinder portion whose inside is a communication flow path and a conical needle tip protruding from the tip of the cylinder portion. It is preferable that the needle tip has an opening of the communication flow path on its peripheral surface.

According to the first aspect of the present invention, the blood vessels connected to the adapter can be connected to a common connector with different thicknesses, and the blood vessel portions having different thicknesses can be used by a common member. become. Further, by including an adapter attached to one end of the blood vessel portion and connecting and fixing the connector to the simulated blood bag, the connection site for connecting different diameters can be miniaturized.

According to the second aspect of the present invention, the blood vessel portion can be firmly held by the adapter tightening and fixing the blood vessel portion by inserting the protruding locking portion of the connector. Since this tightening is to insert a protruding locking portion tapered toward the proximal end side on the outside of the outer cylinder tapered toward the distal end side, the protruding locking portion is inserted. Is easy, and it becomes easy to hold the blood vessel portion.

According to the third aspect of the present invention, the protrusion (convex) of the locking portion of the outflow cylinder is located at the position where the screwing of the connector is completed, and the connector is unexpectedly positioned. It is possible to prevent the connector from rotating.

According to the invention of claim 4, even if the drug solution or the like is excessively administered to the blood vessel portion, it is discharged into the waste liquid container. It is possible to carry out administration training such as infusion administration that is close to the practice of. Further, the adapter and the connector can be used as common parts to reduce the cost.

According to the fifth aspect of the present invention, by having an intermediate connecting member and a communicating member in which the communicating needle pierces and communicates with the shielding valve, it is possible to provide a simulated blood vessel that can switch between a closed state and an open state. The closed state and the open state can be performed by a simple means of rotating the connecting member.

It is a perspective view of the simulated blood vessel which concerns on embodiment of this invention. It is a plan view which disassembled the simulated blood vessel, and the simulated blood bag, the adapter and the connector are shown in the upper row, and the blood vessel portion is shown in the lower row. It is an enlarged vertical sectional view which disassembled the connection fixing part, (a) is a connection fixing part usually used for a blood vessel part, and (b) is a connection fixing part used for a small blood vessel part. 3 (a) is an operation explanatory view of the connecting and fixing portion, in which (a) is a state immediately before the adapter is attached to the blood vessel portion and connected to the connector, and (b) is a state of being connected and fixed to the connector. .. It is explanatory drawing of the simulated blood vessel which attached the discharge connection part and the waste liquid container. It is an enlarged plan view which disassembled the discharge connection part, (a) shows a blood vessel part, a 2nd adapter and a 2nd connector, and (b) shows an intermediate connection member and a connection member. It is an enlarged vertical sectional view of the discharge connection part. It is an operation explanatory view of the intermediate connection member and the connection connection member, (a) is the initial state which was closed by the shielding valve, and (b) is the state which opened the occlusion by breaking the shielding valve. It is an overall perspective view of the state which provided the simulated blood vessel of this invention in an injection practice tool. FIG. 9 is a perspective view showing a state in which the mounting body is removed from the deck and the simulated blood vessel is also removed. It is a perspective view which shows the conventional simulated blood vessel used for the injection practice tool of this invention. It is a partially enlarged perspective view which shows the base end support part of a mounting body. It is a partially enlarged side view of the central base end support portion as viewed from the rear, (a) is a state in which a conventional simulated blood vessel is attached, and (b) is a state in which a new simulated blood vessel is attached. It is a rear end view which looked at the standing piece of the rear end of a mounting body from the rear. It is a partially enlarged perspective view which shows the excision part behind the mounting body.

Hereinafter, embodiments of the simulated blood vessel according to the present invention will be described with reference to the accompanying drawings. In this description, the left side on the drawing (for example, the simulated blood back side in FIG. 2) will be referred to as the proximal end side, and the right side on the drawing (for example, the blood vessel portion side in FIG. 2) will be referred to as the distal end side.

As shown in FIG. 1, the simulated blood vessel 1 includes a simulated blood bag 2 storing simulated blood, a cylindrical, tubular and long blood vessel portion 3 simulating a blood vessel, and a simulated blood bag 2 and a blood vessel portion 3. It is composed of a connecting fixing portion 4 for connecting and fixing. Although not particularly shown, the simulated blood is a liquid colored red to give a sense of presence, is injected into the simulated blood bag 2, and is sealed without air entering the inside of the simulated blood vessel 1. The simulated blood vessel 1 is discarded when it is used, and is a so-called disposable material.

As shown in FIG. 2, the connecting and fixing portion 4 of the simulated blood vessel 1 is composed of an adapter 5 and a connector 6, and after connecting the blood vessel portion 3 to the adapter 5, the simulated blood bag is included in the connector 6. By connecting to the outflow tube 11 of 2, the simulated blood bag 2 and the blood vessel portion 3 are connected and fixed in a state of communicating with each other in the simulated blood vessel 1. The blood vessel portion 3 is molded from a soft resin, and the adapter 5 and the connector 6 are also molded from a resin material.

The simulated blood bag 2 of the simulated blood vessel 1 will be described. The simulated blood bag 2 includes a hollow rectangular storage portion 10 and a cylindrical outflow cylinder 11 protruding from one surface of the storage portion 10. The outflow tube 11 has an annular receiving portion 12 protruding inward from the inner circumference on the base end side (see FIG. 3). The receiving portion 12 receives and engages with the adapter 5 described later, positions and fixes it in the axial direction.

On the outer circumference of the outflow cylinder 11, there are two screw portions 13 protruding for fixing to the connector 6 described later, and two protrusions extending downward from the central lower end of the storage portion 10 which is the base end side of the screw portion 13. It has locking portions 14, 14. The locking portions 14, 14 are located on the front surface and the back surface of the outflow tube 11, and are arranged 180 degrees apart in the circumferential direction. The locking portions 14, 14 are fitted into and engaged with the locked portions 35, 35 of the connector 6 in a state where the connector 6 is fixed (screwed) to the outflow cylinder 11, and the connector 6 is screwed. Is stopped, and the connector 6 is locked so as not to cause unexpected rotation in the locked state.

By connecting and fixing the simulated blood bag 2 and the blood vessel portion 3, the inside of the reservoir 10 and the blood vessel portion 3 communicate with each other, and the simulated blood can be supplied from the reservoir portion 10 into the blood vessel portion 3. The simulated blood bag 2 stores simulated blood in a negative pressure state on the positive pressure side of the vacuum collecting blood vessel, and while making it possible to supply simulated blood to the vacuum collecting blood vessel, liquid leakage from the needle hole generated in the blood vessel portion 3 due to blood sampling or the like. Is suppressed.

The blood vessel portion 3 will be described. The blood vessel portion 3 has a proximal end portion 3a that opens the proximal end side in the longitudinal direction and a distal end portion 3b that closes the other end side, and is a tubular object having a predetermined length, and the proximal end portion 3a is connected and fixed. It is connected to the simulated blood bag 2 by the tool 4. The blood vessel portion 3 is formed of a soft material such as an elastomer that can pierce an injection needle or a drip needle multiple times, and is bent and arranged in a free curve so that blood vessels having individual differences can be simulated. The blood vessel portion 3 has a thin radial thickness (half the difference between the inner diameter and the outer diameter) and is about 0.4 mm.

The connection fixing portion 4 will be described. As described above, the connecting / fixing portion 4 includes an adapter 5 for attaching and holding the blood vessel portion 3 and a connector 6 for connecting and holding the adapter 5 by screwing the adapter 5 into the outflow tube 11. The connection fixing portion 4 irreversibly fixes the blood vessel portion 3 to the simulated blood bag 2 by this connection, and communicates the inside of each other to form a flow path of the simulated blood.

The adapter 5 will be described. As shown in FIGS. 2, 3 and 4, the adapter 5 has a double-cylinder structure having an open end surface composed of an outer cylinder 21 and an inner cylinder 22. The adapter 5 has a space for inserting and holding the proximal end portion 3a of the blood vessel portion 3 in the space between the two cylinders 21 and 22. The radial thickness of this space (half the difference between the inner diameter and the outer diameter) is set to be about 0.44 mm as a dimension larger than the thickness of the blood vessel portion 3. It has a space in the longitudinal direction with both ends open on the inner circumference of the inner cylinder 22, and serves as a flow path for communicating the outflow cylinder 11 and the blood vessel portion 3.

The adapter 5 has an adapter base end portion 23 that is located at the base end side position and is inclined toward the outer circumference, and is slightly inclined inward from the tip end side of the adapter base end portion 23 to the opening side into which the blood vessel portion 3 is inserted. The extended outer cylinder 21 is formed. The outer cylinder 21 has a tapered shape in which the thickness gradually decreases from the adapter base end portion 23 side to the tip end side, and is divided in the circumferential direction to form a plurality of slits 24, 24.

When the adapter 5 is inserted into the outflow tube 11 of the simulated blood bag 2, the adapter base end portion 23 formed in the shape of a conical cylinder having an inclined surface engages with the receiving portion 12 protruding into the outflow tube 11. Moreover, by biting into the adapter 5, the adapter 5 is positioned in the axial direction (longitudinal direction) and fixed. Further, as will be described later, by fixing (screwing) the connector 6 to the outflow tube 11 of the simulated blood bag 2, the outer tube 21 of the adapter 5 gradually inserts the proximal end portion 3a of the blood vessel portion 3. Tighten and fix.

In the present embodiment, as the blood vessel portion 3, as shown in FIG. 3A, the blood vessel portion 3 simulating a normal blood vessel is used, but a blood vessel portion having a diameter different from that of the normal blood vessel portion 3 can be used. .. FIG. 3B shows a small blood vessel portion 15 that is thinner than the blood vessel portion 3 and simulates a small blood vessel. The inner diameter (inner diameter) of the normal blood vessel portion 3 is 1.5 mm, and the inner diameter of the microvessel portion 15 is 1.3 mm. The adapter also has an adapter 5 used for the normal blood vessel portion 3 and a thin adapter 5a for holding the small blood vessel portion 15.

In the thin adapter 5a, the inner diameter of the outer cylinder 21 is made smaller than that of the adapter 5, and the outer diameter of the inner cylinder 22 is made thicker than that of the adapter 5 to match the size of the small blood vessel portion 15. The thin adapter 5a is attached with the connector 6 and the outflow cylinder 11 (simulated blood bag 2) by making the outer diameter of the outer cylinder 21 and the shape and dimensions of the adapter base end portion 23 the same as those of the normal adapter 5. It is possible to hold it. In addition to the normal blood vessel portion 3 and the small blood vessel portion 15, blood vessel portions having different diameters such as a thinner blood vessel portion and a thick blood vessel portion can be used.

Next, the connector 6 will be described. As shown in FIGS. 2, 3 and 4, the connector 6 has a cylindrical box-shaped (cap-shaped) form including an outer wall 31 and a bottom portion 32. The outer wall 31 has a threaded portion 31a protruding from the inner surface thereof in the central direction, and is a nut-shaped object that is screwed and engaged with the threaded portion 13 of the outflow tube 11 of the simulated blood bag 2. The disk-shaped bottom portion 32 has an opening at the center position, and a through hole 33 through which the blood vessel portion 3 is inserted is formed. The connector 6 contains and penetrates the adapter 5 in which the nut-shaped outer wall 31 is screwed into the threaded portion 13 of the outflow tube 11 and the proximal end portion 3a of the blood vessel portion 3 is held in the inner space of the outer wall 31. The blood vessel portion 3 is derived from the hole 33.

A protruding locking portion 34 extending from the periphery of the through hole 33 of the connector 6 toward the inside of the outer wall 31, in other words, protruding from the tip end side toward the proximal end side is formed. The protruding locking portion 34 has a tapered shape in which the thickness gradually decreases from the tip end side to the base end side. Further, the outer surface of the protruding locking portion 34 is formed horizontally, but the inner side surface is the outer surface. It is an inclined surface that inclines toward.

The protrusion locking portion 34 is formed at the edge of the through hole 33 of the bottom portion 32, and protrudes toward the internal space of the outer wall 31 along the axial direction. The protruding locking portion 34 has a tapered cylindrical shape, and the connector 6 is screwed into the outflow cylinder 11 with the adapter 5 equipped with the blood vessel portion 3 inserted into the outflow cylinder 11 of the simulated blood bag 2. Then, it is inserted from the tip of the tapered protruding locking portion 34 between the outer cylinder 21 of the adapter 5 and the inner peripheral surface of the outflow cylinder 11. The protruding locking portion 34, which gradually becomes thicker from the proximal end side to the distal end side, is inserted according to the screwing of the connector 6, so that the outer cylinder 21 of the adapter 5 is gradually pressed against the proximal end portion 3a of the blood vessel portion 3. , The holding state of the blood vessel portion 3 by the adapter 5 is strengthened.

The outer wall 31 of the connector 6 has two concave-shaped recessed edges corresponding to the two locking portions 14, 14 formed on the simulated blood bag 2 at the end edge opposite to the bottom portion 32. Stops 35, 35 are formed. The concave shape of the locked portions 35, 35 is such that the locking portions 14 and 14 of the ridges are positioned in the recessed portions in a state where the connector 6 is screwed into the outflow cylinder 11 of the simulated blood bag 2 to the deepest position. Then, it is positioned and fixed at the screwing completion position. Further, when the connector 6 is unexpectedly rotated by this engagement, the locking portions 14 and 14 of the ridges hit the recessed locked portions 35 and 35 of the connector 6 to prevent the connector 6 from loosening.

As described above, the simulated blood bag 2 and the blood vessel portion 3 can be connected and fixed by the connecting fixing portion 4 composed of the adapter 5 of the simulated blood vessel 1 and the connector 6. Since blood vessels of different diameters can be used, it is possible to practice with simulated blood vessels of various diameters. Further, the connector 6 and the simulated blood bag 2 (outflow tube 11) are used as common parts to reduce the number of parts, and since the connector 6 is connected and fixed so as to wrap the adapter 5, the connecting fixing portion 4 is connected. It can be miniaturized so as not to interfere with the pressing of the simulated blood bag 2 or the training.

Next, in addition to the connection fixing portion 4 described above, a simulated blood vessel 1 (second embodiment) capable of performing administration training in addition to blood collection training will be described. In the second embodiment, the adapter 5 and the connector 6 used in the first embodiment are arranged on the tip portion 3b of the simulated blood vessel 1 to practice administration such as infusion, and the adapter and the connector are shared. The number of parts can be reduced by using the above.

In the simulated blood vessel 1 (first embodiment) shown in FIG. 1, the proximal end portion is connected to the simulated blood bag 2 by the connecting fixing portion 4, and the distal end portion 3b is in a closed state. On the other hand, as shown in FIG. 5, in the simulated blood vessel 1 according to the second embodiment, the end portion of the distal end portion 3b is opened in the same manner as the proximal end portion 3a (see FIG. 6), and the blood vessel portion 3 is formed into a penetrating tubular. It is formed and the discharge connection portion 7 is attached. The discharge connecting portion 7 of the second embodiment is attached with an intermediate connecting member 8 and a connecting member 9, one end of the waste liquid tube 43 is connected to the connecting member 9, and an external waste liquid container 41 is connected to the other end of the waste liquid tube 43. Therefore, the drug solution or the like administered to the blood vessel portion 3 can be discharged to the waste liquid container 41.

As shown in FIGS. 5, 6 and 7, the discharge connection portion 7 includes a second adapter 45 and a second connector 46, and the second adapter 45 has a form common to that of the first adapter 5. , The second connector 46 has a form common to that of the first connector 6. It is preferable to connect the waste liquid tube 43 via the intermediate connecting member 8 screwed into the second connector 46 and the connecting member 9 connecting the intermediate connecting member 8, but the discharge connecting portion 7 (second connector 46). ) May be directly connected to the waste liquid container 41.

The second adapter 45 has the same shape as the first adapter 5 and is a common component. Similar to the first adapter 5, the outer cylinder 51, the inner cylinder 52, the adapter base end portion 53, the slits 54, and 54 are formed, and the tip portion 3b of the blood vessel portion 3 is formed in the space between the outer cylinder 51 and the inner cylinder 52. To hold.

The second connector 46 has the same shape as the first connector 6 and is a common component. Similar to the first connector, the outer wall 61, the threaded portion 61a, the bottom portion 62, the through hole 63, the protruding locking portion 64, and the concave locked portions 65, 65 are formed, and the second connector 46 is connected to the intermediate connecting member 8. It is the same that the protruding locking portions 64, 64 tighten the outer cylinder 61 inward as it is screwed into.

The intermediate connecting member 8 will be described. As shown in FIGS. 6 and 7, the intermediate connecting member 8 has an inflow cylinder 71 having the same shape and dimensions as the outflow cylinder 11, and a cylindrical discharge portion 72 located on the tip side of the inflow cylinder 71 and communicating internally. And have. The intermediate connecting member 8 has an internal space penetrating the center of the member in the longitudinal direction, and serves as a waste liquid discharge flow path 73 communicating with the blood vessel portion 3.

The inflow cylinder 71 has a threaded portion 74 having a thread formed on the outer periphery thereof. Further, the front surface and the back surface of the collar 72a, which is a part of the discharge portion 72 to be described later, have ridge locking portions 75, 75 protruding upward along the longitudinal direction, and the receiving portion 76 is provided on the inner circumference on the proximal end side. have. These shapes and dimensions are the same as the threaded portion 13, the locking portions 14, 14 and the receiving portion 12 of the outflow cylinder 11 of the simulated blood bag 2.

The inflow tube 71 is positioned and fixed by the receiving portion 76 with the second adapter 45 holding the blood vessel portion 3 inserted. Further, the locking portions 75 and 75 of the ridges can screw the second connector 46 until it reaches the recessed position of the concave locked portions 65 and 65 of the second connector 46 and is locked. By engaging the locking portions 75, 75 with the locked portions 65, 65 of the second connector 46, it is possible to prevent the second connector 46 from loosening due to unexpected rotation or the like. It is the same as the first connector 6.

The discharge portion 72 of the intermediate connection member 8 has a cylindrical shape concentric with the inflow cylinder 71, and is formed so as to project toward the opposite side of the inflow cylinder 71 in the longitudinal direction. The base end portion of the inflow cylinder 71 is composed of a collar 72a projecting outward in the shape of a regular hexagonal plate, a base portion 72b projecting cylindrically from the collar 72a, and a cylindrical connecting cylinder 72c further projecting from the tip of the base portion 72b. The connecting cylinder 72c has a threaded portion 72f composed of threads on its surface, and has the same outer diameter as the inflow cylinder 71.

The tip of the base portion 72b (the end on the side of the connecting cylinder 72c) has an annular convex portion 72d protruding outward, and two intermediate locking portions 72e and 72e for stopping the screwing of the connecting member 9 are convex from the flange 72a. It is formed in a protrusion. The intermediate locking portions 72e and 72e are formed on the front surface and the back surface, and are separated from each other by 180 degrees around the circumference.

The intermediate connection member 8 has a discharge flow path 73 that penetrates the center of the member in the longitudinal direction from the inflow cylinder 71 to the discharge portion 72, but shields the discharge flow path 73 inside the vicinity of the tip of the discharge portion 72. A thin film shielding valve 77 is arranged (see FIG. 7). With this shielding valve 77, the state in which the tip portion 3b of the blood vessel portion 3 is closed can be maintained unless the connecting member 9 is screwed into the intermediate connecting member 8 to the completion position.

Next, the connecting member 9 will be described. As shown in FIGS. 6 and 7, the connecting member 9 is in the form of a cylindrical box (cap type) including an outer wall 81 and a bottom 82. The outer wall 81 has a threaded portion 81a projecting from the inner surface thereof in the central direction, and is a nut-shaped object that is screwed and engaged with the threaded portion 72f of the discharge portion 72 of the intermediate connecting member 8.

The outer wall 81 has a partially recessed edge opposite to the bottom portion 82, and has two locked portions at positions corresponding to the intermediate locking portions 72e and 72e formed on the flange 72a of the intermediate connecting member 8. 83, 83 are formed. The locking portions 83, 83 can prevent the connecting member 9 from unexpectedly rotating and continue the screwed state. Further, the edge opposite to the bottom portion 82 of the outer wall 81 is formed with a retaining protrusion 84 protruding from the peripheral edge toward the inner surface side, and engages with the annular convex portion 72d of the intermediate connecting member 8 to exceed a certain range. I try not to pull it out.

The connecting member 9 includes a communication needle 85 that protrudes inward from the center of the circle of the bottom 82 toward the inside of the outer wall 81, and a joint pipe that also protrudes from the center of the circle of the bottom 82 to the opposite side of the communication needle 85. The unit 86 is arranged. The communication needle 85 has a tubular portion having a discharge flow path 87 which is a communication flow path inside, and a conical needle tip protruding from the tip thereof, and the communication needle 85 and the joint pipe portion 86 have an internal space. The discharge flow path 87 communicating with the above is formed. The joint pipe portion 86 is a member having a burrs at its tip, and can be inserted into and connected to the waste liquid tube 43.

When the connecting member 9 is screwed into the intermediate connecting member 8, the communication needle 85 that protrudes inward of the connecting member 9 enters the discharge flow path 73 of the intermediate connecting member 8. Further, when the screwing is continued, the needle tip of the communication needle 85 breaks through the shielding valve 77 that closes the discharge flow path 73 of the intermediate connecting member 8 described above. In this state, the discharge liquid discharged from the discharge flow path 73 of the intermediate connecting member 8 flows into the discharge flow path 87 of the connecting member 9 from the opening 85a formed in the communication needle 85, and the tip of the joint pipe portion 86. It is discharged from the opening 86a of.

As described above, the simulated blood vessel 1 of the second embodiment is directly connected to the waste liquid container 41 by arranging the discharge connection portion 7 including the second adapter 45 and the second connector 46 at the tip portion 3b. Further, by connecting the intermediate connecting member 8 and the connecting member 9, the closed state and the discharging state can be easily switched. That is, when the intermediate connecting member 8 is connected to the discharge connecting portion 7 and the screw between the intermediate connecting member 8 and the connecting member 9 is not completely screwed and is left in a loosened state, the shielding valve 77 formed on the intermediate connecting member 8 is formed. As a result, the simulated blood vessel 1 is shielded by the tip end side. When the connecting member 9 is screwed into the intermediate connecting member 8 from this state, the communication needle 85 breaks through the shielding valve 77 as described above, and the waste liquid is discharged from the joint pipe portion 86 to the waste liquid container 41 via the waste liquid tube 43. Discharge. In this way, it is possible to switch only by the operation of screwing. This makes it possible to easily switch between the blood sampling training conducted in the blocked state and the administration training conducted in the drained state.

Hereinafter, an embodiment of an injection practice tool that can use the new simulated blood vessel 1 according to the present invention will be described with reference to the attached drawings. In this description, the longitudinal direction of the mounting body 101 is the front-rear direction, the left back side of FIG. 9 is the front side or the base end side, and the right front side is the rear side or the tip side. Further, the direction orthogonal to the longitudinal direction of the mounting body 101 will be described as the width direction or the lateral direction.

As shown in FIGS. 9 and 10, the basic form of the injection practice tool according to the present invention is the mounting body 101, the simulated subcutaneous tissue layer 102 arranged on the upper surface of the mounting body 101, and the upper part of the simulated subcutaneous tissue layer 102. It is provided with an upper cover 105 for stretching a simulated skin layer 104 covering the above. The simulated blood vessels 1 and 161 are arranged on the simulated subcutaneous tissue layer 102 (see FIGS. 1 and 11), and the simulated skin tissue layer 104 is covered with the upper cover 105 to find the simulated blood vessels 1 and 161 for injection training. ..

First, the mounting body 101 of the injection practice tool will be described. The mounting body 101 has a substantially plate-shaped body made of a hard resin as a whole and has a shape curved in a ridge shape or an arch shape. As shown in FIG. 10, the inner side of the mounting main body 101 having a protruding arc shape and an arch shape on the back surface side is open, and the opened inner portion is the arm passing portion 142. The mounting body 101 can be used by placing it on a table while being mounted on the deck 140 as shown in FIG. 9, but as shown in FIG. 10, it can be removed from the deck 140 to form an inner portion of the mounting body 101. It is also possible to wrap the arm threading portion 142 around the arm of the pseudo-employee.

When it is used by wrapping it around the arm of a pseudo employee, it is used in a state where the mounting body 101 is removed from the deck shown in FIG. The mounting body 101 is mounted by wrapping the arm loop portion 142 around the arm at a position between the elbow joint of the arm and the wrist. Then, the injection needle can be pierced into the simulated blood vessel 1 from the surface (upper surface) of the simulated skin layer 104 of the upper cover 105 while being attached to the arm to practice blood vessel injection. By attaching it to the arm of the pseudo-employee, it is possible to imitate the blood vessel injection into the arm of the pseudo-employee facing each other, and it is possible to reproduce the individual difference of the pseudo-employee and the realism such as face-to-face implementation.

The configuration of the mounting body 101 will be described. As shown in FIGS. 9 and 10, the mounting body 101 is formed into a ridge or arch shape as a whole by bending the central portion in the width direction in a ridge shape using a hard synthetic resin material such as ABS resin. By using such a hard material, not only the injection needle is prevented from penetrating the mounting body 101 when the practitioner mistakenly uses it, but also the simulated skin layer 104, the simulated subcutaneous tissue layer 102, and the like are removed. Since the whole and appearance are molded from a hard material, you can use it with confidence even if you have no experience in injection practice.

The mounting body 101 has standing pieces 131, 131 with both front and rear ends in the longitudinal direction standing upright. On the surface of the mounting body 101, along this longitudinal direction, from the standing piece 131 on the front side to the standing piece 131 on the rear side, there are two bending grooves 132, 132 which are bending changing means. Notches 133 and 133 notched at the positions of the front and rear standing pieces 131 and 131 corresponding to the bent grooves 132 and 132 are formed, and the arch shape of the arch-shaped mounting body 101 can be widened or narrowed. can. This makes it possible to adjust the width, curved state, and arch state of the mounting body 101 according to the thickness of the arm of the pseudo-employee.

As shown in FIGS. 9 and 10, a plurality of back arranging portions 111 and 111 for arranging the simulated blood bag 2 of the simulated blood vessel 1 are arranged on the rear side of the standing piece 131 on the front side of the mounting body 1, and then a plurality of back arranging portions 111 and 111 are arranged in the width direction. It has a proximal support portion 106 that accommodates a connecting portion 64, which is a proximal portion of the conventional and new simulated blood vessels 1 and 161 and a connecting fixing portion 4, and is formed behind the simulated subcutaneous tissue in a jet-like plane. The tissue layer 102 is arranged, and the posterior standing piece 131 is arranged behind the tissue layer 102.

The simulated subcutaneous tissue layer 102 is a salient arc-shaped or arched body that matches the curved shape of the upper surface of the mounting body 101, and has low resilience in order to reproduce the feel of the subcutaneous tissue and to withstand the deformation of the curved shape of the mounting body 101. It consists of a sex foam material. The low-resilience foam material is, for example, low-foam urethane, and Memory Foam (registered trademark) is preferable. The simulated subcutaneous tissue layer 102 is removable, and its plane extends to the vicinity of the upper edge of the standing piece 131.

Next, the upper cover 105 on which the simulated skin layer 104 is stretched will be described. The simulated skin layer 104 covering the upper side of the simulated subcutaneous tissue layer 102 is stretched on the upper cover 105 arranged on the upper surface of the mounting body 101. The upper cover 105 is formed in an arch shape that matches the curved shape of the upper surface of the mounting body 101, the central portion thereof is cut off, and the simulated skin layer 104 is stretched. A presser foot 108 is formed on the front side of the upper cover 105, and a presser foot connecting portion 107 having both sides open in the width direction is formed between the upper cover 105 and the presser foot 108. The presser foot 108 is located above the back arrangement portions 111 and 111, which will be described later, with the upper cover 105 closed, and the presser foot connecting portion 107 is located above the base end support portion 106.

By forming the simulated skin layer 104 with a urethane-based material, unlike the case where it is formed with a silicon-based material, the dry state (wetting condition) of the disinfecting alcohol can be visually confirmed, and the simulated skin layer 104 is in an unsterilized state where the drying is insufficient. You can prevent injections. Further, by using the urethane-based microcell polymer sheet, it is possible to confirm the unsterilized state from the expansion caused by alcohol.

The upper cover 105 has a locking claw 134 formed on the side of the side edge portion in the longitudinal direction as a means for fixing to the mounting body 101. On the other hand, the locked portion 135 is formed on the mounting main body 101, and the upper cover 105 can be detachably attached to the mounting main body 101 by these engagements.

Next, the simulated blood vessel arranged in the mounting body 101 will be described. As shown in FIG. 11, in the conventional simulated blood vessel 161, the blood vessel portion 163 and the simulated blood bag 162 are connected and fixed by the connecting portion 164, and are supplied as disposable ones. The simulated blood bag 162 stores simulated blood in a bag (back) in the upper part of the drawing, and connects the base end portion of the back 162 and the base end portion 163a of the simulated blood vessel 161 by a cylindrical connecting portion 64. .. The blood vessel portion 163 uses a tubular tube made of natural rubber or the like, and the connecting portion 164 uses a resin molded product having substantially the same thickness (diameter) as the blood vessel portion 163.

In the new simulated blood vessel 1 of the present invention, as shown in FIG. 1, the blood vessel portion 3 and the simulated blood bag 2 are connected by a connecting fixing portion 4. As described above, as shown in FIG. 2, in the connection fixing portion 4, the adapter 5 is arranged at the proximal end portion 3a of the blood vessel portion 3, and the adapter 5 is screwed into the outflow tube 11 of the simulated blood bag 2. Connect with the connector 6 to connect and hold. Since the connector 6 is connected so as to include the adapter 5, the thickness and outer diameter of the connector 6 are larger than those of the conventional connecting portion 164 (see FIG. 11). The connecting and fixing portion 4 of the new simulated blood vessel 1 makes it possible to connect and fix the blood vessel portions 3 having different thicknesses.

As shown in FIGS. 1 and 11, the simulated blood filled in the conventional and new simulated blood vessels 1 and 161 is colored red to give a sense of presence, and air does not enter the inside including the blood vessels 3 and 163. It is sealed with. By keeping air out of the simulated blood bags 2, 162 and blood vessels 3, 163, it is possible to prevent air bubbles, which are a mixture of liquid and air, from entering the syringe when the practitioner pierces the needle. be able to. Further, by completely sealing the simulated blood bags 2 and 162, deterioration of the simulated blood bags 2 and 162 and the blood vessel portions 3 and 163 which are natural rubber can be prevented.

The proximal support 106 of the present invention will be described with reference to FIGS. 12 and 13, but also see FIGS. 1, 5 and 11 for simulated blood vessels. The proximal end support portion 106 supports the proximal end portions 3a and 163a of the blood vessel portions 3 and 163, and supports the connecting portion, the connecting portion 164 and the connecting fixing portion 4 protruding from the simulated blood bags 2 and 162. Yes (see Figure 9). A plurality of step portions 112, 112 are formed behind the three back arrangement portions 111, 111 arranged in the width direction, and recesses 113, 113 are formed between the step portions 112, 112. The recesses 113, 113 have a predetermined width and length so as to accommodate the connecting and fixing portion 4 of the new simulated blood vessel 1. This width length is preferably twice or more the thickness (diameter) of the conventional connecting portion 164 (see FIG. 14).

The recesses 113 and 113 are surrounded on both sides in the width direction by the side support walls 112a and 112a which are the side surfaces of the step portions 112 and 112, and the communication support portion 114 is located behind, but the front is open. The communication support portion 114 has width extension portions 114a and 114a in which the rear portions of the step portions 112 and 112 project so as to protrude in the direction of forming the recess, respectively, and the extension of the width extension portions 114a and 114a. Through holes 114b, 114b formed by notching downward from the upper edge of the communication support portions 114, 114 and inclined toward the opposite width extension portions 114a, 114a are arranged. The inclined and notched inclined portion (outer edge of the through hole 114b) is curved downward to form a rounded V-shape, and the lower ends of the through holes 114b and 114b are the upper surface of the simulated subcutaneous panniculus 102. It is located below. The communication support portions 114 and 114 are not merely plate-shaped bodies, but have through-hole support surfaces 114c and 114c having a predetermined thickness in the front-rear direction and also having the same thickness in the portion notched so as to be inclined.

The width extension portions 114a and 114a of the communication support portions 114 and 114 support the connecting portions 164 and the connecting fixing portions 4 of the simulated blood vessels 1 and 161 arranged in the recesses 113 and 113 so as not to come out to the simulated subcutaneous tissue layer 102. However, the V-shaped through holes 114b and 114b allow the blood vessel portions 3 and 163 having different thicknesses (diameters) to be arranged. Moreover, the lower ends of the through holes 114b and 114b are located below the upper surface of the simulated subcutaneous tissue layer 102, and a gap is provided between the through holes 114b and 114b and the simulated subcutaneous tissue layer 102 in a predetermined anteroposterior direction. As a result, the play positions of the blood vessel portions 3 and 163 are secured, and the upper edge of the simulated subcutaneous tissue layer 102 is prevented from being damaged or damaged with the upper cover 105 closed. Generally, the blood vessel portion having a smaller diameter has a weaker strength, but the smaller the diameter of the blood vessel portion, the more it is supported downward by the communication support portions 114 and 114, making it less likely to be damaged. Further, by forming the through hole support surfaces 114c and 114c having a predetermined length in the front-rear direction on the upper planes of the through holes 114b and 114b of the communication support portions 114 and 114, the upper cover 105 in the through holes 114b and 114b The blood vessel portions 3 and 163 are supported without being damaged by pressing.

Further, the back arrangement portions 111 and 111 on the front side of the base end support portions 106 and 106 are formed on the lower surface of the mounting body 101, and a dent of a predetermined size is formed so that the simulated blood backs 2 and 162 do not shift. Will be done. Further, the upright piece 131 on the front side is formed with a support hole 131a for inserting and fixing the protruding piece arranged at the proximal end position of the simulated blood bags 2 and 162. The support hole 131a is in the form of a combination of a narrow hole on the upper side and a wide hole on the lower side so as to accommodate projecting pieces of different sizes.

The back arrangement portions 111 and 111 wrap the tourniquet band at the time of use, and the presser foot 108 formed on the front side of the upper cover 105 presses the plurality of simulated blood bags 2, 2, 162 and 162 at once. Can be done. When the presser foot 108 is pushed downward, the simulated blood bags 2 and 162 are pressed from above, and the internal pressure of the simulated blood filled therein is increased. This increase in internal pressure is the same for the simulated blood in the blood vessel portions 3 and 163, and realizes a state similar to the actual angry state. In order to wind the tourniquet, both sides of the back arrangement portions 111 and 111 lined up in the mounting body 101, and on both sides of the presser foot 108, the tourniquet holes 115 are notched in a concave shape to facilitate holding the tourniquet. 115 is formed (see FIG. 9).

The cut portion 121 and the short groove 122 in the standing piece 131 at the rear end of the mounting body 101 will be described. As shown in FIGS. 14 and 15, the upright piece 131 at the rear end has notches 133 and 133 corresponding to the bent grooves 132 and 132, and the notches 133 and 133 are between the notches 133 and 133, and the mounting main body is formed. At the curved apex position of 101, a cut portion 121 is formed by cutting out the standing piece 131 downward. The cut portion 121 is wide unlike the notches 133 and 133, and is formed in a V shape that is inclined downward from the standing piece 131 and is curved downward. The excision width is at least to the extent that a thick blood vessel portion can be passed through, and is preferably a width that allows a plurality of blood vessel portions 3 to pass through, and is preferably about the same as the through hole 114b of the communication support portion 114 of the proximal end support portion 106. By having this excision portion 121, it is possible to use the blood vessel portion 3 which is longer than the longitudinal direction of the mounting body 101. In addition to this, as shown in FIGS. 5 and 9, it is possible to provide a discharge connection portion 7, an intermediate connection portion 8, and a connecting member 9 on the distal end side of the blood vessel portion 3 for discharge, enabling administration-type training. Become.

Further, in the simulated subcutaneous tissue layer 102 near the excision portion 121 of the standing piece 131, a short groove 122 extending to the lower end of the excision portion 121 is formed. The short groove 122 preferably gradually descends from its base end (front end) to reach the lower end of the cut portion 121, and is preferably as wide as the width of the cut portion 121, but the base end is at a right angle. It may be one that descends to a right angle. The short groove 122 is arranged only in the vicinity of the posterior standing piece 131 having the excision portion 121, and the other simulated subcutaneous tissue layer 102 does not have a groove shape.

The longitudinal length of the short groove 122 is about the same as the rising height of the standing piece 131, and is more preferably about 1/10 to 2 of the longitudinal length of the simulated subcutaneous tissue layer 102. It is one tenth of the same length. The depth of the short groove 122 has a depth at which the blood vessel portions 3, 163 are completely immersed, and is deeper than the widthwise length of the short groove 122.

By forming this short groove 122, it is possible to prevent the blood vessel portion 3 discharged at the trailing end edge of the upper cover 105 from being damaged and damaged, and further, the blood vessel portion 3 is damaged at the excised portion 121 of the standing piece 131. It prevents it from occurring. Further, the simulated subcutaneous tissue layer 102 itself of the present embodiment does not have a groove for holding a blood vessel portion as in other products, and the blood vessel portion 3 can be freely crawled, and has a plurality of blood vessels and thicknesses. Different blood vessels can be arranged freely, and the user can feel the position of the blood vessels by groping. On the other hand, there is also a case where the simulated blood bag 2 and 162 are pressed with the presser foot 108 to make the blood vessel portions 3 and 163 angry, and in this state, the blood vessel portion 3 is not damaged and the excision portion 121 is used. Need to be discharged. Therefore, it is preferable that the short groove 122 has a length necessary for immersing the swelling blood vessel portion 3 while making the short groove 122 as short as possible.

Further, as shown in FIG. 9, the mounting body 1 is provided with a deck 140 having a flat bottom surface for mounting on a desk or the like. The deck 140 is also provided with a deck cut portion 123 at a position corresponding to the cut portion 121 of the standing piece 131. By having this deck excision portion 123, even when the mounting body 101 is arranged on the deck 140 and practiced on a tabletop, it becomes possible to use a long blood vessel portion or perform administration type training.

1 ... Simulated blood vessel, 2 ... Simulated blood bag, 3 ... Blood vessel part, 3a ... Base end part, 3b ... Tip part, 4 ... Connection fixing part, 5 ... Adapter, 6 ... Connector, 7 ... Discharge connection part, 8 ... Intermediate Connecting member, 11 ... Outflow cylinder, 14 ... Locking part, 21 ... Outer cylinder, 22 ... Inner cylinder, 23 ... Adapter base end, 24 ... Slit, 31 ... Outer wall, 32 ... Bottom, 33 ... Through hole, 34 ... Projection locking portion, 35 ... Locked portion, 9 ... Connecting member, 45 ... Second adapter, 46 ... Second connector, 51 ... Outer cylinder, 52 ... Inner cylinder, 53 ... Adapter base end portion, 54 ... Slit, 61 ... outer wall, 62 ... bottom, 63 ... through hole, 64 ... protruding locking part, 74 ... threaded part, 72f ... threaded part, 73 ... discharge flow path, 77 ... shielding valve, 85 ... communication needle, 85a ... Opening, 87 ... Discharge channel.

Claims (5)

A simulated blood bag filled with simulated blood and a tubular blood vessel portion are connected by a connecting fixing portion, and an injection practice simulation for pressing the simulated blood bag and practicing injection in a state where the blood vessel portion is tense. It ’s a blood vessel,
The connecting and fixing portion has an adapter attached to one end of the blood vessel portion and a connector that includes the adapter and connects to and fixes the simulated blood bag.
The adapter has a space for connecting an open end, which is one end of the blood vessel portion, between the outer cylinder, the inner cylinder, and the outer cylinder and the inner cylinder.
The connector is a simulated blood vessel for injection practice, characterized in that it has a protruding locking portion that tightens a holding state between the adapter and the blood vessel portion while the adapter is included. The simulated blood bag has an outflow tube that is fixed and connected to the connector of the connection fixing part.
The adapter includes an adapter base end portion having an inclined surface for positioning the inserted state into the outflow cylinder, an outer cylinder extending further in the tip direction from the tip position of the adapter base end portion, and an inner cylinder. Have and
The outer cylinder has a plurality of slits divided in the circumferential direction, and each divided outer cylinder has a tapered shape that is tapered from the base end to the tip end.
The connector has a cap shape having an outer wall screwed to the outflow cylinder and a bottom portion, and has a through hole for leading out a blood vessel portion to the bottom portion and a protruding locking portion protruding from the bottom portion in a tapered shape. Have and
When the connector is fixed to the outflow cylinder while the connector includes the adapter, the protruding locking portion is inserted between the inner surface of the outflow cylinder and the surface of the outer cylinder, and the outer cylinder is inserted. The simulated blood vessel for injection practice according to claim 1, wherein the blood vessel is tightened inward. The outflow tube of the simulated blood bag has a locking portion having a ridge shape protruding from the surface of the outflow tube on the base end side of the threaded portion.
The connector has a locked portion in which the base end side edge of the outer wall is recessed.
The injection practice according to claim 2, wherein the protruding locking portion is located in the recess of the locked portion in a state where the connector is screwed into the simulated blood bag and fixed. Simulated blood vessel. A simulated blood bag filled with simulated blood and one end of a tubular blood vessel portion are connected by a connecting fixing portion, and the other end of the blood vessel portion is connected to a drainage tubular object by a discharge connecting portion. It ’s a blood vessel,
The discharge connection portion includes a second adapter attached to the other end of the blood vessel portion, and a second connector that includes and fixes the second adapter to the discharge cylinder-shaped object.
The second adapter has an adapter base end having an inclined surface, an outer cylinder extending from the tip position of the adapter base end, an inner cylinder, and a blood vessel portion between the outer cylinder and the inner cylinder. Has a space to connect the open ends of
The outer cylinder has a plurality of slits divided in the circumferential direction, and each divided outer cylinder has a tapered shape that is tapered from the base end to the tip end.
The second connector has a cap shape having an outer wall screwed to the discharge cylinder and a bottom portion, and has a through hole for leading out the blood vessel portion to the bottom portion and a protrusion protruding from the bottom portion in a tapered shape. With a locking part,
With the second connector containing the second adapter, the protruding locking portion is inserted between the inner surface of the discharge cylinder and the surface of the outer cylinder, and the outer cylinder is inserted inward. The simulated blood vessel for injection practice according to any one of claims 1, 2 or 3, wherein the attachment state of the second adapter and the blood vessel portion is maintained by tightening. It has an intermediate connecting member which is a discharge cylinder-shaped object connected to the discharge connecting portion, and a connecting member further connected to the intermediate connecting member.
The intermediate connection member has a discharge flow path inside, a shielding valve that closes the discharge flow path, a screw portion that connects to the second connector of the discharge connection portion, and a screw portion that connects to the connection member. Have,
The connecting member has a communication needle that irreversibly switches from a closed state to an open state by breaking through the shielding valve.
The communication needle is composed of a cylinder portion whose inside is a communication flow path and a conical needle tip protruding from the tip of the cylinder portion.
The simulated blood vessel for injection practice according to claim 4, wherein the needle tip has an opening of the communication flow path on its peripheral surface.

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