Simulated organ models

Abstract

To provide a simulated organ model which an operator can use more easily and more simply than an existing simulator or organ model.SOLUTION: The simulated organ model includes: a simulated organ model body 1; an eccentric rotary body 2 arranged in the simulated organ model body 1; and a driving unit 3 for driving the eccentric rotary body 2. The eccentric rotary body 2 is relatively rotated with respect to the simulated organ model body 1, and the surface of the eccentric rotary body 2 and the simulated organ model body 1 are directly slid so that the cyclic repetitive operation of the simulated organ model body 1 in association with the sliding can be regenerated.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention mainly relates to a simulated organ model used for training surgical techniques.

Background Art

[0002] (Surgical skill training using a simulated organ) Conventionally, surgical skill training using a simulated organ model has been mainly performed to compensate for the lack of operating experience of young doctors.

[0003] Such surgical skill training uses, as described below, animal organs such as pigs called wet labs, artificial simulated organs such as simulators called dry labs, and organ models. In addition, although the number is small, training using live animals such as pigs called animal labs is also being carried out.

[0004] (Off-JT) Here, these wet labs, dry labs, etc. are collectively referred to as Off-the-job training (Off-JT) because they are performed at different times and environments from clinical work targeting actual patients.

[0005] Off-JT is rapidly spreading as a means of educating surgeons' surgical skills and cultivating surgeons in a situation where there is no risk to patients. In Japan, the Cardiovascular Surgery Specialist Certification Organization requires 30 hours of Off-JT experience for obtaining a cardiovascular surgery specialist qualification.

[0006] (Dry lab) As a means of Off-JT, the spread of dry labs is accelerating, but there are problems with the properties of living tissues and the reproducibility of anatomy. Therefore, it has become common to perform advanced training in a wet lab environment approximated to clinical practice after repeated basic training using a dry lab.

[0007] (Wet lab) For wet lab use, wild animal organs are unsuitable due to hygiene and safety concerns, while organs from livestock raised for meat are preferable, primarily from pigs and other meat-producing animals. In particular, pig hearts are used for training in cardiovascular surgery due to their similar weight and dimensions. In digestive surgery, pig stomachs and large intestines are used, and in respiratory surgery, pig heart and lungs are used.

[0008] (Animal Lab) On the other hand, animal labs are the most high-end training method, using live animals.

[0009] In the animal lab, pigs are primarily used. Using live animals offers advantages such as blood circulation, bleeding, respiration, biological response to drugs, and anatomical reproducibility. In particular, the heartbeat, respiration, and gastrointestinal motility and behavior of living organisms are important elements for training surgical techniques.

[0010] However, animal labs have extremely limited applications due to ethical, safety, and cost considerations, and are unsuitable for routine training.

[0011] Therefore, efforts have traditionally been made to incorporate biologically specific movements and behaviors into the target organs in wet labs.

[0012] (Conventional technology that drives a simulated heart by pressurizing its internal cavity) First, as a conventional technology of the type that drives a simulated heart by pressurizing the lumen, there are technologies disclosed in Japanese Patent Publication No. 2006-276258, Japanese Patent Publication No. 6629002, Japanese Patent Publication No. 2012-203016, and Japanese Patent No. 5810250. The technologies disclosed in these documents reproduce the behavior of a heart beating by pressurizing and depressurizing the working fluid in a heart model or the lumen of a pig heart.

[0013] Furthermore, Japanese Patent Publication No. 2020-091306 discloses a technique that fills the lumen of a target organ with a working fluid to reproduce hemodynamics and the diffusion of contrast agents, but this technique is not intended to impart movement to the target organ.

[0014] (Conventional technology that drives the entire simulated heart) Furthermore, as a conventional technology that drives the entire simulated heart, there is a technology disclosed in Japanese Patent Publication No. 2005-2020267. This technology uses an external drive device that combines a rotational drive means and a oscillating means to impart movement to the entire simulated organ.

[0015] (Conventional technology that drives only a portion of the entire simulated heart) Furthermore, there is a prior art technique that drives a part of a simulated heart, disclosed in Japanese Patent Publication No. 2014-142535. This technique reproduces the peristaltic movement inside the stomach by connecting a rotating drive body to a rotating body and bringing the rotating body into contact with a stomach model.

[0016] Thus, prior art for driving a target organ includes methods such as filling the inside with a working fluid and applying pressure, methods for imparting movement to the entire simulated organ using an external drive mechanism, and methods for imparting a desired movement to the inside of a simulated organ using an external drive mechanism.

[0017] In surgical procedures such as cardiac surgery, laparoscopic surgery, and thoracoscopic surgery, as well as in clinical examinations such as gastrointestinal endoscopy, the pulsation and movement of specific organs significantly influence the procedure. Therefore, training simulators for these procedures must accurately reproduce these behaviors.

[0018] Surgical training needs to be conducted in small groups and in a simplified manner due to the spread of COVID-19. Since it's not feasible to use a large number of people for preparing and using simulators, there is a need for simulated organ models with a simple and straightforward structure that possess all the necessary and sufficient functions. [Overview of the project] [Problems that the invention aims to solve]

[0019] All of the conventional organ driving methods described above have complex configurations that require careful handling. For example, in driving a target organ by increasing or decreasing the pressure of a working fluid, ensuring confidentiality is a major issue, it is difficult to reliably prevent leakage of the working fluid, and it is always necessary for the simulator maintenance staff to manage the simulator. In addition, driving an organ model by external driving means also has a mechanically complex configuration and is not simple.

[0020] For example, in cardiac surgery, in order to train for coronary artery bypass surgery under cardiac beating, it is required to beat the hearts of animals such as pigs. For this, there are driving methods such as internal pressure increase and decrease of the pig heart according to the conventional technology, but there is a problem that the device is large and complex and cannot be used alone by the doctor who is the user. Even during the COVID-19 pandemic, there is a need for surgical training, such as in surgical skills review meetings led by professional societies, and there is a demand for the realization of a wet lab with a simple and easy structure that reproduces the beating and behavior.

[0021] The present invention has been made in view of such circumstances, and an object thereof is to provide a simulated organ model that can be easily used by an operator in a simple and easy manner as compared with conventional simulators and organ models.

Means for Solving the Problems

[0022] The inventor conducted trial and error to improve the reproducibility of the behavior of actual human organs such as the heart and digestive tract in surgical skills training, and obtained knowledge about highly reproducible behavior imparting means for animal organs such as pigs and simulated organs. When actually creating a prototype and conducting intensive development, the present invention was completed.

[0023] That is, according to the main viewpoints of the present invention, the following configurations are provided.

[0024] (1) A simulated organ model body, An eccentric rotating body disposed inside the simulated organ model body, And having, The eccentric rotating body is rotationally driven relative to the simulated organ model body, and the surface of the eccentric rotating body and one surface of the simulated organ model body are directly slid, thereby reproducing the periodic repetitive operation of the portion of the simulated organ model body related to this sliding. A simulated organ model characterized by this.

[0025] (2) In the simulated organ model for surgical procedure training according to (1) above, The rotational speed of the eccentric rotating body is the same as the pulsation rate simulated by the above simulated organ model. A simulated organ model characterized by this.

[0026] (3) In the simulated organ model according to (2) above, The rotational speed is 15 rpm to 60 rpm. A simulated organ model characterized by this.

[0027] (4) In the simulated organ model according to (1) above, Furthermore, it has a driving part for driving the eccentric rotating body. A simulated organ model characterized by this.

[0028] (5) In the simulated organ model according to (4) above, The driving body is arranged inside the simulated organ model body. A simulated organ model characterized by this.

[0029] (6) In the simulated organ model according to (4) above, It has fixing means for fixing the driving body to the simulated organ model body. A simulated organ model characterized by this.

[0030] (7) In the simulated organ model according to (4) above, The driving body is arranged outside the simulated organ model body, The driving body and the eccentric rotating body are connected by a flexible shaft. A simulated organ model characterized by this.

[0031] (8) In the simulated organ model described in (4) above, The drive unit is an electric motor with a rated voltage of 12V or less. A simulated organ model characterized by the following features.

[0032] (9) In the simulated organ model described in (1) above, The shape of the outer surface of the eccentric rotating body that slides against the simulated organ model has a shape in which the tangent line does not intersect with any other position on the outer surface. A simulated organ model characterized by the following features.

[0033] (10) In the simulated organ model described in (1) above, The ratio of the major axis length to the minor axis length in the direction perpendicular to the rotation axis of the eccentric rotating body is 1 / 2 or more. A simulated organ model characterized by the following features.

[0034] (11) In the simulated organ model described in (1) above, The eccentricity of the eccentric rotating body is 1 / 2 or more. A simulated organ model characterized by the following features.

[0035] (12) In the simulated organ model described in (1) above, The above simulated organ model itself is an animal organ derived from livestock raised for meat. A simulated organ model characterized by the following features.

[0036] (13) In the simulated organ model described in (12) above, The animal organs derived from livestock raised for meat are from pigs and sheep. A simulated organ model characterized by the following features.

[0037] (14) In the simulated organ model described in (1) above, The aforementioned simulated organ models consist of the heart, lungs, esophagus, stomach, small intestine, large intestine, and blood vessels. A simulated organ model characterized by the following features.

[0038] (15) In the simulated organ model in (1) above, The aforementioned simulated organ model is an artificial simulated organ model formed from an elastic material. A simulated organ model characterized by the following features.

[0039] (16) In the simulated organ model in (1) above, A simulated organ model characterized by reproducing behavior with different phases by using one or more of the aforementioned rotating drive units simultaneously.

[0040] Further features of this invention, other than those described above, are disclosed in the following section on embodiments and drawings. [Brief explanation of the drawing]

[0041] [Figure 1] Figure 1 is a schematic diagram showing a simulated organ model according to one embodiment of the present invention.

[0042] [Figure 2] Figure 2 is an explanatory diagram showing the implantation of a simulated organ model drive unit.

[0043] [Figure 3] Figure 3 is a schematic diagram showing the simulated organ model drive unit.

[0044] [Figure 4] Figure 4 is a schematic diagram showing the shape of an eccentric rotating body.

[0045] [Figure 5] Figure 5 is an explanatory diagram illustrating the implantation process of the simulated organ model drive unit.

[0046] [Figure 6] Figure 6 is an explanatory diagram illustrating the implantation process of the simulated organ model drive unit.

[0047] [Figure 7]Figure 7 is a schematic diagram showing a modified version of the simulated organ model drive unit.

[0048] [Figure 8] Figure 8 is a schematic diagram showing a modified version of the simulated organ model.

[0049] [Figure 9] Figure 9 is a schematic diagram showing a second embodiment of the simulated organ model.

[0050] [Figure 10] Figure 10 is a schematic diagram showing a modified version of the simulated organ model drive unit. [Modes for carrying out the invention]

[0051] One embodiment of the present invention will be described below with reference to the attached drawings.

[0052] (First embodiment) First, as a first embodiment, we will describe an example in which the present invention is applied to a simulated organ model for training in coronary artery bypass surgery techniques in cardiovascular surgery.

[0053] Coronary artery bypass surgery is a procedure that involves suturing coronary arteries approximately 2 mm in diameter. The procedure performed without the use of a heart-lung machine, while the heart is still beating, is specifically called off-pump coronary artery bypass surgery. This embodiment is a simulated organ model designed for training in off-pump coronary artery bypass surgery techniques.

[0054] The details are explained below.

[0055] (Simulated organ model) In Figure 1, reference numeral 1 denotes the main body of a simulated organ model used for training in surgical techniques. Inside this simulated organ model body 1 is embedded an organ drive unit 4, which consists of an eccentric rotating body 2 for displacing the simulated organ model body 1 and a drive unit 3 for rotating the eccentric rotating body.

[0056] In this first embodiment, the main body of this simulated organ model 1 is a part of a pig's heart.

[0057] As shown in Figure 2, the apex of the simulated organ model body 1 (pig heart) is incised as indicated by the symbol A in the figure, and a portion of the new inner wall is removed to create a space 14 for embedding the eccentric rotating body and drive unit, and the organ drive unit 4 is inserted into this space 14 as indicated by the arrow in the figure.

[0058] (Eccentric rotating body) Figure 3 is a schematic diagram showing the organ drive unit 4.

[0059] First, in this first embodiment, the eccentric rotating body 2 has a rotating body body 5 that is substantially hemispherical (mushroom cap shaped), and an eccentric rotating central shaft 6 attached to an eccentric shaft C at a position offset by a predetermined dimension from the central axis B of the body 5.

[0060] The rotating body 5 has one surface 5a on the side from which the rotational axis 6 is derived, and a spherical outer surface 5b that contacts the inner surface of the simulated organ model body 1. This outer surface 5b is in direct contact with the simulated organ model body 1 and needs to continue rotating by sliding against the inner surface of the space 14 when rotated. For this reason, the outer surface 5b of the eccentric rotating body 2 is formed as a smooth surface with no protrusions or snags.

[0061] The shape of this eccentric rotating body 2 can be described using the shape of this embodiment (Figure 4(a)) as follows.

[0062] (1) The tangent line T does not interfere with any other location on the outer surface 5b. (2) A recess is acceptable on part of the outer surface 5b, but a protrusion is not desirable. (3) The ratio of the major axis length to the minor axis length in the direction perpendicular to the axis of rotation is 1 / 2 or greater (in the example in Figure 4(a), it is a perfect circle, so the minor axis = major axis and the ratio is 1). (4) The eccentricity ratio (S / L) is 1 / 2 or greater. Furthermore, it is preferable that the dimensions of the eccentric rotating body 2 be designed to match the dimensions of the simulated organ model body 1. In this example (pig heart), the outer diameter in the direction perpendicular to the central axis B is 40 mm, and the thickness in the direction along the central axis B is 20 mm. The eccentric rotating central axis 6 is mounted along the eccentric axis C, which is eccentrically positioned 10 mm outward from the original central axis B.

[0063] The dimensions of the eccentric rotating body 2 and the shape of its outer surface 5b can be appropriately designed according to the dimensions of the simulated organ model body 1, the type of organ, and the shape and position of the part to be displaced, as long as the above-mentioned conditions are met. Similarly, the position where the eccentric central axis is attached, that is, the mounting position that determines the eccentric behavior of the eccentric rotating body, can also be appropriately determined.

[0064] For example, as shown in Figure 4(b), the eccentric rotating body 2 may have an elliptical cross-sectional shape. In this case, the eccentric rotation central axis 6 may be positioned along the central axis of the eccentric rotating body 2.

[0065] Furthermore, while the manufacturing method and materials for this eccentric rotating body 2 can be adapted as needed, in this example, it was created using an FDM-type 3D printer and manufactured using ABS filament.

[0066] (Driver) Next, the drive unit 3 in this embodiment is a small DC reduction geared motor, which is directly connected to the eccentric rotation center axis 6 as shown in Figure 3(b).

[0067] Specifically, this drive unit 3 has a reduction gear head 9 with a reduction ratio of 1:75 attached to a DC 12V DC motor 8, and the eccentric rotation center shaft 6 is derived from this reduction gear head 9 as the output shaft.

[0068] This allows, for example, the rotational speed of the eccentric rotating body 2 to be set to the same value as a typical heart rate. In this example, the reduction rotational speed from the reduction gearhead 9 is set to 60 revolutions per minute (60 rpm) to match the heart rate.

[0069] Furthermore, the drive unit 3 is housed in an exterior housing 10 made of, for example, ABS resin, to protect it from blood and tissue fluid. It is even more preferable to protect the entire unit 4, including the eccentric rotating body 2, by covering the drive unit 3 and the eccentric rotating body 2 with a film made of polyethylene or polyvinydenum chloride.

[0070] (Securing the drive unit) Furthermore, in order to prevent the drive unit 3 itself from rotating when the drive unit 3 drives the eccentric rotating body 2, it is important to fix the drive unit 3 inside the simulated organ model body 1.

[0071] In this embodiment, the drive unit 4 (drive unit 3 and eccentric rotating body 2) is installed in the internal space 14 through an insertion port (Figure 2) provided in the simulated organ model body 1 (Figure 5). After installation, the incised insertion port is closed with sutures, staples, or the like, as shown in Figure 6. This allows the drive unit 3 to be fixed inside the simulated organ model body 1 by the external force from the myocardial tissue resulting from the closure.

[0072] When using animal organs as the main body of the simulated organ model 1, there will be individual differences in size and tissue characteristics. For example, when installing the drive unit 4 in a relatively large animal heart, the drive unit 3 itself may rotate, and the sliding between the eccentric rotating body 2 and the main body of the simulated organ model 1 may not function properly. In this case, it is preferable to provide a projection on the housing 10 of the drive unit 3 that can be caught, or to add a structure such as a fixing stay 15 as shown in Figure 7, and fix it to the main body of the simulated organ model 1 using this stay 15, so that the drive unit 3 can be easily fixed inside the simulated organ model 1. The stay 15 can be fixed with sutures or staples.

[0073] (Power supply and operating specifications) It is important that off-the-job training (Off-JT) for surgical techniques can be conducted simply and with a minimal setup. Typically, it is preferable to have a setup that can be used, for example, on an office desktop.

[0074] Therefore, in this embodiment, instead of using a general AC-DC power supply to operate the DC motor 8, a USB connector 17 is used by interposing a boost circuit 16 as shown in Figure 3(b).

[0075] In this example, power is supplied to the drive unit 3 by connecting the USB connector to a USB power supply having an electrical capacity of 5V and 12W. USB power supplies, such as mobile batteries, are readily available worldwide and are small in size. However, since the output voltage is 5V, in this example, a boost circuit 16 is used to boost the voltage to 12V.

[0076] (Example of operation) When the simulated organ model 1, consisting of the above configuration, is connected to a power source using the USB connector 17, the eccentric rotating body 2 rotates at 60 revolutions per minute via the eccentric rotation central axis 6. As a result, the outer surface 5b of the eccentric rotating body 2 slides while maintaining close contact with the inner surface of the space 14 in the cardiac lumen, causing the myocardial tissue to follow the shape of the outer surface 5b of the eccentric rotating body 2 and to undergo periodic, repetitive displacement according to the eccentricity ratio / eccentricity amount of the eccentric axis.

[0077] In this embodiment, when comparing the phases at 180 degrees and 0 degrees during one rotation of the motor (360 degrees), the normal direction variation on the myocardial surface was approximately 3 mm.

[0078] In this embodiment, the position and orientation of the drive unit 3 and the eccentric rotating body 2 are adjusted so that the eccentric rotating body is positioned directly below the left anterior descending coronary artery, which is the most frequently trained area in coronary artery bypass surgery training. This makes it possible to obtain a specific and localized periodic repetitive motion of approximately 3 mm in the anterior descending coronary artery.

[0079] Furthermore, in this embodiment, the entire drive unit 4 is completely embedded within the simulated organ model body 1, and at first glance, the existence of the device itself is not even recognizable. Therefore, it is visually natural and a highly realistic beating heart model can be obtained.

[0080] (modified version) In the example above, the main body of the simulated organ model was a pig's heart (320g), but if a sheep's heart or the like is used, the main body of the simulated organ model is relatively small (120g), and in this case, it is difficult to create space to embed the main drive unit.

[0081] In this embodiment, the sheep heart described above is used as the main body 1 of the simulated organ model. As shown in Figure 8, only the eccentric rotating body 2 is embedded inside the main body 1 of the simulated organ model. The eccentric rotating central axis 6 attached to the eccentric rotating body 2 is extended using a flexible shaft 18 with a diameter of 6 mm and a resin protective film, and is led out of the main body 1 of the simulated organ model, where it is connected to the drive unit 3.

[0082] When the drive unit 3 is operated in this state, the eccentric rotating body 2 can be rotated eccentrically within the cardiac lumen via the flexible shaft 18. As a result, the outer surface 5b of the eccentric rotating body 2 slides within the cardiac lumen, thereby obtaining a periodic repetitive motion on the outer surface of the myocardium.

[0083] When reproducing such respiratory behavior, the rotational speed of the drive unit is preferably 10 to 30 rpm, more preferably 15 rpm.

[0084] For reproducing a normal heart rate, a frequency of 60-120 rpm is preferable, while for tachycardia / arrhythmia, 200-300 rpm is preferable.

[0085] (Second embodiment) This second embodiment provides a simulated organ model that simulates surgical procedures on hilar pulmonary vessels under thoracoscopy.

[0086] In recent years, endoscopic surgery has advanced remarkably, and it is now being applied not only to gastrointestinal surgery but also to thoracic surgery and neurosurgery. Endoscopic surgery is highly complex because it involves respiratory and pulse-related behaviors in the target organs. Therefore, to conduct effective surgical training, it is necessary to reproduce these behaviors in simulated organ models.

[0087] As shown in Figure 19, in this embodiment, the simulated organ model body 1' is a part of the pig's heart and lung, including the hilar vessels 19. In this example, the simulated organ model body 1' is cut open at a position corresponding to the back side of the hilar vessels 19 to create a space for embedding the drive unit 4'.

[0088] In this embodiment, the eccentric rotating body 2' has a cylindrical shape with a diameter of 15 mm along the axial direction and 10 mm in the direction perpendicular to the axis, and a circular cross-section. The rotational axis 6 is derived from the eccentric position of this cylindrical eccentric rotating body 2' and connected to the drive unit 3. The drive unit 4' configured in this way is embedded in the space of the simulated organ model body 1', and the drive unit 3 is fixed by closing the incision position that provides the space.

[0089] With this configuration, the drive unit 4' drives the drive unit 3 at 60 revolutions per minute, which drives the eccentric rotating body 2, allowing the surface of the eccentric rotating body 2 to slide against the back surface of the hilar blood vessels. This makes it possible to cause the inner wall of the hilar blood vessels to perform a periodic repetitive motion up and down with an amplitude of approximately 4 mm at 60 times per minute.

[0090] Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment and can be modified in various ways without changing the gist of the present invention.

[0091] For example, although the above-mentioned simulated organ models 1 and 1' were animal-derived organs, they may also be made of artificial materials such as silicone or gel.

[0092] Furthermore, in the above embodiment, only a single drive unit 4, 4' was embedded in the simulated organ model body 1, 1', but two or more units 4, 4' may be embedded to provide a complex operation.

[0093] Furthermore, as previously mentioned, the shape of the outer surface of the rotating body 2 must be smooth so as not to catch on the inner surfaces of the simulated organ model bodies 1 and 1', and it is undesirable for any irregularities to be formed. However, as shown in Figure 10, there is no problem if the irregularities 21 are formed in the axial direction rather than the circumferential direction.

[0094] Furthermore, in the above embodiment, the drive unit 4 was in direct contact with the inner surface of the simulated organ model body 1, but a lubricant or lubricating member may be interposed, for example. As a lubricating member, for example, a bag made of a flexible material may be inserted in close contact with the inner surface of the simulated organ model, and the drive unit 4 may be placed inside this bag. In this case, a lubricant may also be applied to the inner surface of the bag. [Explanation of Symbols]

[0095] 1…Main body of the simulated organ model 2…Eccentric rotating body 3…Drive unit 4… Organ drive unit 5…Rotating body 5a…One side 5b...Outer surface 6…Eccentric rotational center axis 8… DC motor 9…Reduction gearhead 10… Housing 14...space 15... Stay 16…Boost circuit 17… Connector 18… Flexible shaft 19…hilar blood vessels 21…Unevenness

Claims

1. An organ drive unit for use embedded in an animal-derived simulated organ model for surgical technique training, This simulated organ model has an eccentric rotating body installed inside the main body, The eccentric rotating body is driven to rotate eccentrically inside the simulated organ model body, and by sliding the outer surface of the eccentric rotating body against the inner surface of the simulated organ model body, the periodic repetitive pulsating motion of the part of the simulated organ model body involved in this sliding motion is reproduced. It is, A rotary drive shaft that drives the eccentric rotating body is attached to one surface of the eccentric rotating body. The opposite side of this eccentric rotating body from the side to which the rotation drive shaft is attached is composed of a hemispherical surface that protrudes toward the main body of the simulated organ model along the axial direction of the rotation drive shaft, and is connected to the side to which the rotation drive shaft is attached in a smooth curved manner, allowing it to slide smoothly against the inner surface of the main body of the simulated organ model without catching. An organ drive unit characterized by the following features.

2. In the organ drive unit according to claim 1, The above-mentioned simulated organ model has a drive motor that is fixed and embedded within the main body and drives the eccentric rotating body via the rotation drive shaft. An organ drive unit characterized by the following features.

3. In the organ drive unit according to claim 1, The hemispherical surface of the eccentric rotating body that protrudes toward the main body of the simulated organ model is the outer surface shape of a mushroom cap. An organ drive unit characterized by the following features.

4. In the organ drive unit according to claim 2, The drive motor has a fixing means for fixing it to the main body of the simulated organ model. An organ drive unit characterized by the following features.

5. In the organ drive unit according to claim 2, The aforementioned drive motor is an electric motor with a rated voltage of 12V or less. An organ drive unit characterized by the following features.

6. In the organ drive unit according to claim 1, The shape of the hemispherical surface that slides against the main body of the simulated organ model of the eccentric rotating body has a shape in which the tangent line does not intersect with any other position on the outer surface. An organ drive unit characterized by the following features.

7. In the organ drive unit according to claim 1, The ratio of the major axis length to the minor axis length in the direction perpendicular to the rotation axis of the eccentric rotating body is 1 / 2 or more. An organ drive unit characterized by the following features.

8. In the organ drive unit according to claim 1, The eccentricity of the eccentric rotating body is 1 / 2 or more. An organ drive unit characterized by the following features.

9. In the organ drive unit according to claim 1, The above simulated organ model itself is an animal organ derived from livestock raised for meat. An organ drive unit characterized by the following features.

10. In the organ drive unit according to claim 9, The animal organs derived from livestock raised for meat are from pigs or sheep. An organ drive unit characterized by the following features.

11. In the organ drive unit according to claim 1, The simulated organ model itself is one of the following: heart, lungs, esophagus, stomach, small intestine, large intestine, or blood vessels. An organ drive unit characterized by the following features.

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