Human body model

Abstract

To provide a human body model capable of acquiring an ultrasonic echo image that more closely resembles a human body when, for example, EVUS guide is performed.SOLUTION: A human body model 1 comprises a blood vessel model 11 simulating a blood vessel of a human body and a tissue model 21 disposed around the blood vessel model 11 and simulating a tissue around the blood vessel. A plurality of bubbles 31 are arranged dispersed between a surface of the tissue model 21 (an outermost surface s of the human body model 1) and the blood vessel model 11.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a human body model.

Background Art

[0002] A technique (EVUS guide: Extravascular Ultrasound Guide) is known in which treatment is performed while inserting a medical device such as a catheter into a blood vessel using an ultrasonic diagnostic apparatus. This technique has the advantage that there is no exposure to radiation such as X-rays, and for example, the behavior of a medical device inserted into the body can be confirmed in real time.

[0003] In order to acquire the above-described technique, for example, training may be performed using a human body model. As such a human body model, for example, a human body model having a touch and hardness close to those of a human body and capable of providing an echo image in which subcutaneous tissue can be visually recognized has been proposed (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the conventional human body model as described above, since ultrasonic waves are reflected by aluminum oxide dispersed in the gel-like simulated subcutaneous tissue, the echo image of the entire site where aluminum oxide is dispersed appears excessively white (bright) on the monitor, and tends to be different from the echo image of an actual human body containing a large amount of water in the subcutaneous tissue.

[0006] The present invention has been made based on the above circumstances, and an object thereof is to provide a human body model capable of obtaining an ultrasonic echo image closer to the human body, for example, when performing an EVUS guide.

Means for Solving the Problems

[0007] Some aspects of the present disclosure are (1) A human body model including a blood vessel model simulating a blood vessel of a human body and a tissue model arranged around the blood vessel model and simulating the tissue around the blood vessel, The human body model is characterized in that a plurality of bubbles are dispersedly arranged between the surface of the tissue model and the blood vessel model. (2) A lower layer having a blood vessel model simulating a blood vessel of a human body and a first tissue model arranged around the blood vessel model and simulating the tissue around the blood vessel, and an upper layer provided on the lower layer and having a second tissue model, The human body model is characterized in that a plurality of bubbles are dispersedly arranged in at least any one of the inside of the upper layer, the boundary between the upper layer and the lower layer, and the inside of the lower layer. (3) The human body model according to (2) above, wherein the first tissue model includes a resin material and fine particles having an acoustic impedance different from that of the resin material. (4) The human body model according to (2) above, wherein the second tissue model includes a resin material and fine particles having an acoustic impedance different from that of the resin material. (5) Comprising a mesh sheet in which wires are woven, The human body model according to any one of (1) to (4) above, wherein the plurality of bubbles are held between the wires of the mesh sheet. (6) Comprising a resin sheet, The human body model according to any one of (1) to (4) above, wherein the plurality of bubbles are held inside the resin sheet, and (7) The plurality of bubbles are dispersedly arranged along the direction of the outermost surface in the human body model according to any one of (1) to (6) above.

[0008] In addition, in this specification, "deep part" means a part of the human body model on the side of the blood vessel model rather than the plurality of bubbles (bubble group). Also, "outermost surface" means the surface facing the outside, which is located on the side opposite to the side of the blood vessel model with the plurality of bubbles (bubble group) in between and is located at the part of the human body model farthest from the above blood vessel model. The "outermost surface" may be a flat surface or a curved surface.

Advantages of the Invention

[0009] The present invention can provide a human body model capable of obtaining a deeper ultrasonic echo image closer to the human body, for example, when performing an EVUS guide.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3A

Figure 3B

Figure 4

Figure 5

Figure 6

Figure 7

Modes for Carrying Out the Invention

[0011] The human body model of the present disclosure is a human body model including a blood vessel model simulating the blood vessels of the human body and a tissue model arranged around the blood vessel model and simulating the tissues around the blood vessels, and a plurality of air bubbles are dispersedly arranged between the surface of the tissue model and the blood vessel model.

[0012] The present disclosure includes a lower layer having a blood vessel model simulating the blood vessels of the human body and a first tissue model arranged around the blood vessel model and simulating the tissues around the blood vessels, and an upper layer provided on the lower layer and having a second tissue model, and is a human body model in which a plurality of air bubbles are dispersedly arranged in at least any one of the inside of the upper layer, the boundary between the upper layer and the lower layer, and the inside of the lower layer.

[0013] Hereinafter, the first to sixth embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited only to the embodiments described in the drawings. In addition, the dimensions of each part shown in the drawings are the dimensions shown for facilitating the understanding of the implementation content and do not necessarily correspond to the actual dimensions.

[0014] [First Embodiment] FIG. 1 is a schematic cross-sectional view showing the first embodiment. As shown in FIG. 1, the human body model 1 is generally composed of a blood vessel model 11, a tissue model 21, and a plurality of air bubbles 31.

[0015] The blood vessel model 11 is a part simulating the blood vessels of the human body. The blood vessel model 11 may have a branch portion or a curved portion. Specifically, the blood vessel model 11 can be composed of, for example, a tubular member having a lumen 11h. The lumen 11h of the blood vessel model 11 may contain a liquid L such as a pseudo blood simulating blood, water, or physiological saline.

[0016] The material constituting the blood vessel model 11 is not particularly limited as long as it has the same texture (such as flexibility and strength) as the blood vessel to be simulated. Examples of the above materials include those obtained by gelling silicone, polyvinyl alcohol, urethane, and the like. The hardness of the blood vessel model 11 may be adjusted, for example, by adjusting the water content contained in the gelled material or by combining a plurality of materials. The blood vessel model 11 can be formed using known techniques.

[0017] Note that, in the lumen 11h of the blood vessel model 11, a liquid having a pressure higher than the pressure applied to the outer peripheral surface of the blood vessel model 11 may be accommodated. That is, the pressure of the liquid L in the blood vessel model 11 may be set to a pressure higher than the atmospheric pressure (1 atm). In such a case, for example, when a perforation occurs in the blood vessel model 11 for some reason, the liquid L can be leaked (simulated bleeding) from the blood vessel model 11 to the outside through the perforation, similar to an actual blood vessel. Further, the presence or absence of leakage of the liquid L may be confirmed by observing the pressure of the liquid L.

[0018] The tissue model 21 is a site disposed around the blood vessel model 11 and simulating the tissue around the blood vessel. The tissue model 21 may be, for example, one simulating muscle or the like.

[0019] Examples of the material constituting the tissue model 21 include hydrogels obtained by mixing a polymer material such as polyvinyl alcohol, poly(meth)acrylate, polyvinylpyrrolidone, and a liquid such as water and simulated body fluid and gelling them. Note that the texture (tactile sensation, hardness, etc.) similar to the tissue to be simulated may be adjusted by appropriately selecting the type of the polymer material and the mixing ratio with the liquid.

[0020] The plurality of bubbles 31 are composed of a bubble group composed of two or more bubbles 311 (hereinafter, the plurality of bubbles are also collectively referred to as "bubble group 31"). The bubble group 31 is dispersedly arranged between the surface of the tissue model 21 (the outermost surface s of the human body model 1) and the blood vessel model 11. In the present embodiment, the bubble group 31 is arranged near the surface of the tissue model 21.

[0021] The acoustic impedance of the gas contained in the bubble 311 is different from that of the tissue model 21 around the bubble 311. Due to this difference, an interface that reflects ultrasonic waves is formed at the boundary between the bubble 311 and the tissue model 21. Therefore, a part of the ultrasonic waves incident from the outermost surface s of the human body model 1 can be reflected by the above interface, and the ultrasonic waves reaching deep beyond the bubble group 31 can be weakened. As a result, the echo image of the tissue model 21 between the bubble group 31 and the blood vessel model 11 shown on the monitor of the ultrasonic diagnostic apparatus does not become too white (bright) and becomes an image closer to the human body.

[0022] The size of each bubble 311, the distribution of the sizes, and the density of the bubbles 311 in the bubble group 31 are not particularly limited as long as the effects of the present invention are not impaired. These may be determined, for example, by the size of the human body model 1, the type of tissue to be simulated, and the like.

[0023] The site where the bubble group 31 is arranged may be any site as long as it is a site between the surface of the tissue model 21 and the blood vessel model 11. The above site may be, for example, a site adjacent to the surface of the tissue model 21 (the outermost surface s of the human body model 1), or a site adjacent to the blood vessel model 11.

[0024] Examples of the gas contained in the bubble 311 include air, oxygen, nitrogen, and inert gases such as argon. Among these, air is preferred.

[0025] As shown in FIG. 1, it is preferable that the plurality of bubbles 31 are dispersedly arranged along the surface direction of the outermost surface s of the human body model 1. The bubble group 31 may be arranged in a layer so as to be substantially parallel to the outermost surface s of the human body model 1, for example. Note that the bubbles 311 included in the bubble group 31 do not necessarily have to be aligned in a specific direction. Thereby, the ultrasonic waves reaching deep across the surface direction of the human body model 1 can be weakened.

[0026] Next, the usage mode of the human body model will be described. Here, an example will be given of a procedure (EVUS guidance) in which treatment is performed while inserting a guide wire into the blood vessel model 11 of the human body model 1 using an ultrasonic diagnostic apparatus.

[0027] When using the human body model 1, first, pseudo blood or the like is introduced into the blood vessel model 11. Specifically, a pump (not shown) is used to introduce pseudo blood into the lumen 11h while measuring the pressure. The above pressure may be set to a value such that pseudo blood or the like leaks from the blood vessel model during penetration. The above pressure may be changed to pulsate.

[0028] Next, using an ultrasonic diagnostic apparatus, an ultrasonic probe is pressed against the outermost surface s of the human body model 1, and an echo image of the human body model 1 is displayed on the monitor while irradiating ultrasonic waves. Then, a guide wire is inserted into the lumen of the blood vessel model 11. Specifically, after inserting the guide wire into the lumen 11h of the blood vessel model 11 via a connector (not shown), the tip of the guide wire is pushed forward to the treatment site while looking at the monitor.

[0029] Here, since the acoustic impedance of the guide wire is different from that of the blood vessel model 11, the guide wire advancing in the lumen 11h is projected onto the monitor screen. Therefore, even if the guide wire enters an unintended branch pipe at the branch portion of the blood vessel model 11, that state can be confirmed on the monitor, and the guide wire can be pushed forward to the desired site while modifying the procedure.

[0030] Also, the ultrasonic waves reaching the deep part of the tissue model 21 are weakened by the plurality of bubbles 31, and the acoustic impedance between the blood vessel model 11 and the tissue model 21 is also different. For this reason, on the monitor, the tissue model 21 with the whiteness (brightness) suppressed by the ultrasonic waves and the blood vessel model 11 having an acoustic impedance different from that of the tissue model 21 are displayed separately. As a result, even if the guide wire penetrates the blood vessel model 11, that state can be confirmed on the monitor.

[0031] As described above, since the human body model 1 has the above configuration, for example, when performing an EVUS guide, a part of the ultrasonic wave incident from the outermost surface s can be reflected by the surfaces of the bubbles 311 included in the bubble group 31. Therefore, the ultrasonic wave reaching the deep part beyond the bubble group 31 can be weakened, and a deeper echo image closer to the human body can be obtained.

[0032] [Second Embodiment] FIG. 2 is a schematic cross-sectional view showing the second embodiment. As shown in FIG. 2, the human body model 2 is generally composed of a lower layer A2 and an upper layer B2. Note that an example of the usage mode of the human body model 2 is the same as that of the first embodiment.

[0033] The lower layer A2 is a part having a blood vessel model 12 and a first tissue model 221. The blood vessel model 12 is a part simulating the blood vessels of the human body. The first tissue model 221 is a part arranged around the blood vessel model 12 and simulating the tissue around the blood vessel. The blood vessel model 12 and the first tissue model 221 can be exemplified by the same ones as the blood vessel model 11 and the tissue model 21 described in the first embodiment, respectively.

[0034] The upper layer B2 is provided on the lower layer A2 and is a part having a second tissue model 222. The second tissue model 222 may simulate, for example, the skin or the like.

[0035] Examples of the material constituting the second tissue model 222 include hydrogels obtained by gelling a mixture of a polymer material such as silicone, urethane, polyvinyl alcohol, poly(meth)acrylate, polyvinylpyrrolidone, and a liquid such as water and artificial body fluid. Note that the texture (tactile sensation, hardness, etc.) similar to the tissue to be simulated may be adjusted by appropriately selecting the type of the polymer material and the mixing ratio with the liquid.

[0036] The material constituting the second tissue model 222 may be the same as or different from the material of the first tissue model 221. If the materials are different, the acoustic impedances of the two may be made different from each other so that the first tissue model 221 and the second tissue model 222 can be distinguished on the monitor.

[0037] In the present embodiment, a plurality of bubbles 31 are dispersedly arranged inside the upper layer B2 along the surface direction of the outermost surface s of the human body model 2. Since the plurality of bubbles 31 (bubble group 31) are the same as those in the first embodiment, they are denoted by the same reference numerals.

[0038] As described above, since the human body model 2 has the above configuration, for example, when performing an EVUS guide, a part of the ultrasonic wave incident from the outermost surface s can be reflected by the surface of each of the bubbles 311 included in the bubble group 31. Therefore, the ultrasonic wave reaching the deep part beyond the bubble group 31 can be weakened, and a deeper echo image closer to the human body can be obtained.

[0039] In the above-described embodiment, the human body model 2 in which a plurality of bubbles 31 are dispersedly arranged inside the upper layer B2 has been described. However, the plurality of bubbles 31 may be dispersedly arranged at the boundary k (see FIG. 3A) between the upper layer B21 and the lower layer A21, inside the lower layer A22 (see FIG. 3B), or a combination of these parts.

[0040] [Third Embodiment] FIG. 4 is a schematic cross-sectional view showing the third embodiment. As shown in FIG. 4, the human body model 3 is generally composed of a lower layer A3 and an upper layer B3. The human body model 3 is different from the second embodiment in that it includes the upper layer B3. The lower layer A3 has the same configuration as the above-described lower layer A2. The second tissue model 222 is the same as in the second embodiment, and the plurality of bubbles 31 (bubble group 31) are the same as in the first embodiment, and are denoted by the same reference numerals. Also, an example of the usage mode of the human body model 3 is the same as that of the first embodiment.

[0041] The upper layer B3 is a part provided on the lower layer A3 and having the second tissue model 222.

[0042] In this embodiment, a mesh sheet 43 in which the wire strands w are woven is provided. The wire strands w extend along the surface of the mesh sheet 43. A plurality of air bubbles 31 are held between the wire strands of the mesh sheet 43. Each of the air bubbles 311 may be arranged separately for each gap between the wire strands w, w of the mesh sheet 43 woven in a lattice pattern, for example.

[0043] The mesh sheet 43 of this embodiment is arranged inside the upper layer B3 and is arranged inside the second tissue model 222 so that its surface is substantially parallel to the outermost surface s of the human body model 3.

[0044] As the wire strands w constituting the mesh sheet 43, one or a plurality of single wires or one or a plurality of stranded wires can be used respectively. However, a single wire means a single wire, and a stranded wire means a bundle of wire groups formed by twisting a plurality of single wires together in advance.

[0045] Examples of the wire strands w include natural fibers, chemical fibers, metal wires, etc. Examples of natural fibers include plant fibers and animal fibers. Examples of plant fiber materials include cotton, hemp, pulp, bamboo, etc. Examples of animal fiber materials include silk, wool, etc. Examples of chemical fibers include regenerated fibers, semi-synthetic fibers, synthetic fibers, etc. Examples of regenerated fiber materials include rayon, cupra, polynosic, etc. Examples of semi-synthetic fiber materials include acetate, triacetate, promix, etc. Examples of synthetic fiber materials include acrylic, polyester, polyamide, urethane, etc. Examples of metal wire materials include steel such as stainless steel and carbon steel, copper, and aluminum. For simplicity, synthetic fibers such as polyamide may be used as the wire strands w.

[0046] The wire diameter of the wire w, the size of the opening (gap) between adjacent wires w, w, and the thickness of the mesh sheet 43 can be appropriately selected according to the size of the air bubbles 311 held between the wires w, w, the total volume of the air bubbles 311, the density of the air bubbles 311, and the like.

[0047] As described above, since the human body model 3 has the above configuration, each of the air bubbles 311 can be reliably held in the gap between the wires w, w of the mesh sheet 43. Therefore, ultrasonic waves reaching deep parts beyond the mesh sheet 43 can be weakened, and a deeper echo image closer to the human body can be obtained.

[0048] In the above-described embodiment, the human body model 3 in which the mesh sheet 43 is disposed inside the upper layer B3 has been described. However, the mesh sheet 43 may be disposed at the boundary k between the upper layer B3 and the lower layer A3, inside the lower layer A3, or a combination of these parts.

[0049] Further, the human body model may include, instead of the mesh sheet 43 or together with the mesh sheet 43, a non-woven fabric in which air bubbles are held in the gaps between adjacent fibers.

[0050] [Fourth Embodiment] FIG. 5 is a schematic cross-sectional view showing the fourth embodiment. As shown in FIG. 5, the human body model 4 is generally composed of a lower layer A4 and an upper layer B4. The human body model 4 is different from the third embodiment in that it includes the upper layer B4. The lower layer A4 has the same configuration as the lower layer A2 described above. The second tissue model 222 is the same as in the second embodiment, and the plurality of air bubbles 31 (air bubble group 31) are the same as in the first embodiment, and are denoted by the same reference numerals. Also, an example of the usage mode of the human body model 4 is the same as that of the first embodiment.

[0051] The upper layer B4 is provided on the lower layer A4 and is a part having the second tissue model 222.

[0052] In this embodiment, a resin sheet 54 is provided, and a plurality of air bubbles 31 are held inside the resin sheet 54. Each of the air bubbles 31 may be, for example, uniformly and evenly dispersed inside the resin sheet 54.

[0053] The resin sheet 54 of this embodiment is disposed inside the upper layer B4 and is disposed inside the second tissue model 222 such that its surface is substantially parallel to the outermost surface s of the human body model 4.

[0054] Examples of the material for forming the resin sheet 54 include those obtained by gelling silicone, urethane, polyvinyl alcohol, etc. from the viewpoint of the difference in acoustic impedance from the first tissue model 221 or the air bubble 331.

[0055] The thickness of the resin sheet 54 can be appropriately selected according to the size of the air bubbles 311 held inside, the total volume of the air bubbles 311, the density of the air bubbles 311, etc.

[0056] As described above, since the human body model 4 has the above configuration, each of the air bubbles 311 can be reliably held inside the resin sheet 54. Therefore, ultrasonic waves reaching deep beyond the resin sheet 54 can be weakened, and a deeper echo image closer to the human body can be obtained.

[0057] In the above-described embodiment, the human body model 4 in which the resin sheet 54 is disposed inside the upper layer B4 has been described. However, the resin sheet 54 may be disposed at the boundary k between the upper layer B4 and the lower layer A4, inside the lower layer A4, or a combination of these parts.

[0058] [Fifth Embodiment] FIG. 6 is a schematic cross-sectional view showing the fifth embodiment. As shown in FIG. 6, the human body model 5 is generally composed of a lower layer A5 and an upper layer B5. The human body model 5 is different from the second embodiment in that it includes the lower layer A5. Note that the upper layer B5 has the same configuration as the upper layer B2 described above. Also, examples of the usage mode of the human body model 5 are the same as those of the first embodiment.

[0059] The lower layer A5 is a site having the blood vessel model 12 and the first tissue model 251.

[0060] The blood vessel model 12 is a site simulating the blood vessels of the human body. The blood vessel model 12 can exemplify a model similar to the blood vessel model 11 described in the first embodiment.

[0061] The first tissue model 251 includes a resin material 251a and fine particles 251b. The resin material 251a can exemplify the same material as the material constituting the tissue model 21 described in the first embodiment. Further, as the resin material 251a, rubbers such as urethane-based, silicone-based, and styrene-based rubbers may be used.

[0062] The fine particles 251b are particles having an acoustic impedance different from that of the resin material 251a. The fine particles 251b may be uniformly dispersed, for example, evenly in the resin material 251a so that ultrasonic waves can be uniformly reflected within the lower layer A5.

[0063] Examples of the material forming the fine particles 251b include resin materials, metal materials, ceramic materials, carbon, etc. Examples of the resin material include polypropylene, etc. Examples of the metal material include tungsten, etc. Examples of the ceramic material include glass, bismuth oxide, barium sulfate, aluminum oxide, etc. These fine particles 251b may be in a fibrous form such as carbon fiber, glass fiber, cellulose nanofiber, chitosan nanofiber, etc.

[0064] The particle size and particle size distribution of the fine particles 251b and the dispersion density of the fine particles 251b are not particularly limited as long as the effects of the present invention are not impaired. These may be determined, for example, by the size of the human body model 5, the type of tissue to be simulated, etc.

[0065] As described above, since the human body model 5 has the above configuration, for example, by capturing the echo of ultrasonic waves reflected at the interface between the resin material 251a and the fine particles 251b, the positions of the first tissue model 251 and the blood vessel model 12 can be accurately grasped.

[0066] [Sixth Embodiment] FIG. 7 is a schematic cross-sectional view showing the sixth embodiment. As shown in FIG. 7, the human body model 6 is generally composed of a lower layer A6 and an upper layer B6. The human body model 6 is different from the second embodiment in that it includes the upper layer B6. Note that the lower layer A6 has the same configuration as the lower layer B2 described above. Also, an example of the usage mode of the human body model 6 is the same as that of the first embodiment.

[0067] The upper layer B6 is provided on the lower layer A6 and is a part having the second tissue model 262. The second tissue model 262 of the present embodiment includes a resin material 262a and fine particles 262b. As an example of the resin material 262a, the same material as that constituting the tissue model 21 described in the first embodiment can be exemplified.

[0068] The fine particles 262b are particles having an acoustic impedance different from that of the resin material 262a. The fine particles 262b may be uniformly dispersed in the resin material 262a, for example, so that ultrasonic waves can be uniformly reflected within the upper layer B6.

[0069] As an example of the material and form for forming the fine particles 262b, the same as the fine particles 251b described in the fifth embodiment can be exemplified.

[0070] The particle size, particle size distribution, and dispersion density of the fine particles 262b are not particularly limited as long as the effects of the present invention are not impaired. These may be determined, for example, by the size of the human body model 6, the type of tissue to be simulated, and the like.

[0071] As described above, since the human body model 6 has the above configuration, for example, by capturing the echo of the ultrasonic wave reflected at the interface between the resin material 262a and the fine particles 262b, the position of the second tissue model 262 can be accurately grasped.

[0072] Note that the present disclosure is not limited to the configuration of the above-described embodiments, is indicated by the claims, and is intended to include all changes within the meaning and scope equivalent to the claims. A part of the configuration of the above-described embodiments may be deleted, replaced with another configuration, or another configuration may be added to the configuration of the above-described embodiments.

[0073] For example, in the first embodiment described above, the human body model 1 in which a plurality of bubbles 31 are directly dispersed and arranged in the tissue model 21 has been described. However, the plurality of bubbles 31 may be held between the wire elements of the mesh sheet as shown in the third embodiment, or held inside the resin sheet as shown in the fourth embodiment. In such a case, the mesh sheet or the resin sheet may be arranged at any site between the surface of the tissue model and the blood vessel model.

[0074] Also, in the fifth and sixth embodiments described above, the human body models 5 and 6 that individually contain the fine particles 251b and 262b in the lower layer A5 or the upper layer B6 have been described. However, a human body model in which fine particles are contained in both the lower layer and the upper layer may also be used.

[0075] In addition, if an EVUS guide is performed using the above-described human body models 1 to 6, a deeper ultrasonic echo image closer to the human body can be obtained. Therefore, by using the human body model of the present disclosure, an operator can experience an EVUS guide similar to that used for the human body, or perform training for an EVUS guide (for example, training for puncture for blood collection or drug injection) before using it for a patient.

Explanation of reference numerals

[0076] 1 to 6 Human body models 11, 12 Blood vessel models 21 Organizational model 221, 251 First organizational model 222, 262 Second organizational model 251a, 262a Resin material 251b, 262b Fine particles 31 Multiple bubbles (bubble group) 43 Mesh sheet 54 Resin sheet A2 - A6 Lower layer B2 - B6 Upper layer s Outermost surface of the human body model w Elementary wire

Claims

1. A human body model comprising a blood vessel model simulating a blood vessel of a human body, and a tissue model arranged around the blood vessel model simulating a tissue around the blood vessel, A human body model, characterized in that a plurality of air bubbles are dispersed between the surface of the tissue model and the blood vessel model.

2. A human body model comprising: a lower layer having a blood vessel model simulating a blood vessel of a human body, and a first tissue model arranged around the blood vessel model simulating a tissue around the blood vessel; and an upper layer provided on the lower layer and having a second tissue model, A human body model, characterized in that a plurality of air bubbles are dispersed and disposed at least in the interior of the upper layer, in the boundary between the upper layer and the lower layer, and / or in the interior of the lower layer.

3. 3. The human body model according to claim 2, wherein the first tissue model includes a resin material and fine particles having an acoustic impedance different from an acoustic impedance of the resin material.

4. 3. The human body model according to claim 2, wherein the second tissue model includes a resin material and fine particles having an acoustic impedance different from an acoustic impedance of the resin material.

5. Equipped with a mesh sheet woven with wire, The human body model according to claim 1 , wherein the plurality of air bubbles are held between wires of the mesh sheet.

6. A resin sheet is provided. The human body model according to claim 1 , wherein the plurality of air bubbles are held inside the resin sheet.

7. The human body model according to claim 1 , wherein the plurality of bubbles are dispersed and arranged along a planar direction of the outermost surface.

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