Lacrimal duct treatment training device

Abstract

To facilitate training for operations to lacrimal ducts.SOLUTION: A lacrimal duct surgery training device comprises a skull model 101, a skin model 102, and a lacrimal duct model 103. The lacrimal duct model 103 is held by the skull model 101 and the skin model 102, and has a lacrimal sac part 131, a nasolacrimal duct part 132, an upper lacrimal canaliculus part 133, and a lower lacrimal canaliculus part 134.SELECTED DRAWING: Figure 8

Description

Technical Field

[0001] The present disclosure relates to a lacrimal duct surgery training device.

Background Art

[0002] Tears are excreted into the nasal cavity through the lacrimal duct. When the lacrimal duct is blocked, for example, after opening the blocked part of the lacrimal duct, a treatment is performed in which a thin tube called a lacrimal duct tube is left in the lacrimal duct for a certain period.

[0003] The operation of opening the lacrimal duct and the operation of leaving the lacrimal duct tube are performed blindly by a thin metal rod called a bougie. In recent years, a method of performing the operation while observing using a thin endoscope called a lacrimal duct endoscope has also been used (see, for example, Patent Document 1). In any case, it is a highly skilled and complex surgery that requires proficiency.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, there are virtually no methods for training in such procedures other than using donated bodies. There are training devices that consist of a face model made of soft material with an opening that mimics the shape of the lacrimal duct. However, the lacrimal duct is intricately supported by bone and skin, and its mechanical properties change greatly depending on its location. Therefore, when opening the lacrimal duct or inserting a lacrimal duct tube, it is necessary to carefully adjust the strength and direction of the force applied. However, training devices that only have an opening in a soft material cannot adequately train for such complex procedures. This is true not only for inserting a lacrimal duct tube, but also for other procedures on the lacrimal duct, such as taking tissue samples from within the lacrimal duct for diagnosis or injecting therapeutic solutions into the lacrimal duct.

[0006] The objective of this disclosure is to facilitate training in various procedures related to the lacrimal duct. [Means for solving the problem]

[0007] One embodiment of the lacrimal duct treatment training device of the present disclosure comprises a skull model, a skin model covering the outside of the skull model, and a lacrimal duct model held by the skull model and the skin model, wherein the lacrimal duct model has a lacrimal sac portion, a nasolacrimal duct portion extending downward from the lacrimal sac portion, and superior and inferior lacrimal canaliculi portions extending laterally from the lacrimal sac portion.

[0008] One embodiment of a lacrimal duct treatment training device involves a lacrimal duct model being held within a skull model and a skin model. This creates areas within the lacrimal duct model that are easily deformed and areas that are not, thus reproducing a more realistic lacrimal duct condition and enabling advanced training.

[0009] In one embodiment of a lacrimal duct treatment training device, the lacrimal duct model has an upper retaining portion formed in the superior lacrimal canaliculus and a lower retaining portion formed in the inferior lacrimal canaliculus; the skull model has an orbital opening, an upper retaining portion that holds the upper retaining portion, a lower retaining portion that holds the lower retaining portion, and a nasolacrimal duct retaining portion that holds the nasolacrimal duct; and the skin model has an eye-like portion that covers the orbital opening, the eye-like portion having an superior lacrimal canaliculus retaining portion that holds the superior lacrimal canaliculus, an inferior lacrimal canaliculus retaining portion that holds the inferior lacrimal canaliculus, an superior punctal opening that communicates with the terminal opening of the superior lacrimal canaliculus, and an inferior punctal opening that communicates with the terminal opening of the inferior lacrimal canaliculus.

[0010] This configuration allows for the reproduction of the mechanical properties of a real lacrimal duct, which has relatively soft and easily deformable lacrimal canaliculi and a firm nasolacrimal duct, enabling training in a more realistic environment.

[0011] In one embodiment of the lacrimal duct training device, the superior and inferior lacrimal canaliculi holding sections can be through-holes extending along the back surface of the skin model into which the superior and inferior lacrimal canaliculi are inserted, respectively. This configuration allows for a more realistic representation of the lacrimal canaliculi surrounded by muscle tissue.

[0012] In one embodiment of the lacrimal duct treatment training device, the upper retaining part protrudes upward from the end of the superior lacrimal canaliculus, the lower retaining part protrudes downward from the end of the inferior lacrimal canaliculus, the upper holding part protrudes downward from the upper part of the orbital opening, and the lower holding part protrudes upward from the lower part of the orbital opening. This configuration facilitates connection between the retaining part and the holding part, and allows for the reproduction of movement and deformability closer to that of a real lacrimal canaliculus.

[0013] In one embodiment of the lacrimal duct treatment training device, the nasolacrimal duct retaining portion is formed in a cylindrical shape on the posterior side of the maxilla, surrounding the nasolacrimal duct portion, so that the lower end of the inserted nasolacrimal duct portion reaches the nasal cavity opening formed in the skull model. This configuration makes it possible to reproduce a state closer to that of a real nasolacrimal duct surrounded by a bony nasolacrimal duct.

[0014] In one embodiment of the lacrimal duct treatment training device, the lacrimal duct model can be detachably held to a skull model and a skin model. This configuration is economical because worn-out lacrimal duct models can be replaced. Furthermore, it is possible to use different lacrimal duct models that mimic various pathological conditions.

[0015] One embodiment of the lacrimal duct model of the present disclosure relates to a lacrimal duct model attached to a lacrimal duct treatment training device having a skull model and a skin model, the lacrimal duct model comprising a lacrimal sac portion, a nasolacrimal duct portion extending downward from the lacrimal sac portion, and superior and inferior lacrimal canaliculi portion extending laterally from the lacrimal sac portion, and is held by the skull model and the skin model.

[0016] One form of the lacrimal duct model has a shape that closely resembles that of a real lacrimal duct, and when held by a skull model and a skin model, it can reproduce movement and deformability that are closer to those of a real lacrimal canaliculi.

[0017] In one embodiment of the lacrimal duct model, it has an upper retaining portion formed in the superior lacrimal canaliculus and a lower retaining portion formed in the inferior lacrimal canaliculus, where the upper and lower retaining portions are held by the upper and lower retaining portions formed in the skull model, the nasolacrimal duct portion is held by the nasolacrimal duct retaining portion formed in the skull model, and the superior and inferior lacrimal canaliculi are held by the superior and inferior lacrimal canaliculi retaining portions formed in the skin model. By adopting such a configuration, it is possible to reproduce characteristics closer to those of a real lacrimal duct.

[0018] In one embodiment of the lacrimal duct model, the superior and inferior lacrimal canaliculi can be made more transparent than the lacrimal sac and nasolacrimal duct. This configuration allows the endoscopic view to more closely resemble that of the actual lacrimal duct.

[0019] In one embodiment of the lacrimal duct model, the model may have an obstructed section that can be opened. This configuration allows for the reproduction of a pathological condition in which the lacrimal duct is obstructed, and enables training in procedures to open the lacrimal duct. [Effect of the Invention]

[0020] According to the lacrimal duct surgery training device of the present disclosure, various trainings for the lacrimal duct, such as an operation to open the lacrimal duct and an operation to insert a lacrimal duct tube, can be easily performed. [Brief Description of the Drawings]

[0021] [Figure 1] It is a perspective view showing a lacrimal duct model according to an embodiment. [Figure 2] It is a front view showing a skull model according to an embodiment. [Figure 3] It is a rear view showing a skull model according to an embodiment. [Figure 4] It is a perspective view showing an enlarged holding part. [Figure 5] It is a front view showing a skin model. [Figure 6] It is a rear view showing a skin model. [Figure 7] It is a perspective view showing an enlarged eye socket insertion convex part. [Figure 8] It is a perspective view showing an enlarged periphery of the holding part in a state where the lacrimal duct model and the skin model are attached to the skull model. [Mode for Carrying Out the Invention]

[0022] The lacrimal duct surgery training device of the present disclosure includes a skull model 101, a skin model 102 and a lacrimal duct model 103 that are detachable from the skull model 101. In the following, when referring to the up-down and left-right directions, it shall be the up-down and left-right directions in the state where a human stands upright.

[0023] As shown in Figure 1, the lacrimal duct model 103 is formed from a soft material such as silicone resin, mimicking the shape of the human lacrimal duct. The lacrimal duct model 103 has a lacrimal sac portion 131, a nasolacrimal duct portion 132 extending downward from the lacrimal sac portion 131, and a lacrimal canaliculi portion extending laterally from the lacrimal sac portion 131. The lacrimal canaliculi portion has an upper superior lacrimal canaliculi portion 133 and a lower inferior lacrimal canaliculi portion 134. An upper lacrimal canaliculi terminal opening 133a is formed at the end of the upper lacrimal canaliculi portion 133, and an inferior lacrimal canaliculi terminal opening 134a is formed at the end of the inferior lacrimal canaliculi portion 134. The upper lacrimal canaliculi terminal opening 133a is formed on the lower surface side of the upper lacrimal canaliculi portion 133, and the inferior lacrimal canaliculi terminal opening 134a is formed on the upper surface side of the inferior lacrimal canaliculi portion 134. Figure 1 shows the lacrimal duct model corresponding to the lacrimal duct of the right eye. The lacrimal duct model corresponding to the left eye is mirror-image symmetric to the lacrimal duct model corresponding to the right eye.

[0024] The terminal openings 133a of the superior lacrimal canaliculus and 134a of the inferior lacrimal canaliculus, and the terminal opening 132a of the nasolacrimal duct formed at the end of the nasolacrimal duct 132, are in communication with the superior lacrimal canaliculus 133 and inferior lacrimal canaliculus 134, and with the lacrimal sac 131 and nasolacrimal duct 132. Openable occlusions can also be provided at various positions between the terminal openings 133a and 134a of the superior lacrimal canaliculus and the terminal opening 132a of the nasolacrimal duct. By providing openable occlusions, training to open the occlusions can be performed. Openable occlusions can be easily formed by methods such as vacuum casting.

[0025] The lacrimal duct model 103 is partially held in place by the skull model 101 and the skin model 102. By having only a portion of the lacrimal duct model 103 held in place by the skull model 101 and the skin model 102, it is possible to create a state in which the lacrimal duct model 103 deforms when force is applied, just like a real lacrimal duct, allowing for more realistic training.

[0026] The ends of the superior lacrimal canaliculus 133 and the inferior lacrimal canaliculus 134 are formed with an upper retaining portion 135 and a lower retaining portion 136, respectively, for holding the lacrimal duct model 103 to the skull model 101. The upper retaining portion 135 has an L-shape with a rod-shaped body that extends outward from the end of the superior lacrimal canaliculus 133 (opposite to the nasolacrimal duct portion 132) and protrudes upward, while the lower retaining portion 136 has an inverted L-shape with a rod-shaped body that extends outward from the end of the inferior lacrimal canaliculus 134 and protrudes downward. Furthermore, the rod-shaped bodies of the upper retaining portion 135 and the lower retaining portion 136 each have large diameter portions 135a and 136a, respectively.

[0027] The skull model 101 is formed from a rigid material such as foamed polyurethane, mimicking the shape of the eye and nose areas of a human skull. As shown in Figures 2 and 3, the skull model 101 has a maxillary portion 141 that mimics the maxilla, a zygomatic portion 142 that mimics the zygomatic bone, a mandibular portion 143 that mimics part of the mandible, and a frontal portion 144 that mimics part of the frontal bone, with left and right orbital openings 111 and nasal cavity openings 112 formed therein.

[0028] The skull model 101 has an outer surface that almost perfectly replicates the shape of a human skull, but the cranial cavity side has some bones omitted or its shape altered to facilitate the attachment of the lacrimal duct model 103. The skull model 101 also has a skull-side retaining part for holding the lacrimal duct model 103, which is not present in an actual skull. The skull-side retaining part includes an upper retaining part 113 that holds the upper retained part 135, a lower retaining part 114 that holds the lower retained part 136, and a nasolacrimal duct retaining part 115 that holds the nasolacrimal duct part 132. The retaining parts are formed corresponding to the left and right lacrimal duct models 103, respectively.

[0029] As shown in Figure 4, the upper retaining portion 113 is cylindrical, projecting downward from the portion of the frontal bone portion 144 that becomes the orbital opening 111, and a rod-shaped upper retaining portion 135, projecting upward from the end of the superior lacrimal canaliculus portion 133, is inserted into it. The lower retaining portion 114 is cylindrical, projecting upward from the portion of the maxillae bone portion 141 that becomes the orbital opening 111, and a rod-shaped lower retaining portion 136, projecting downward from the end of the inferior lacrimal canaliculus portion 134, is inserted into it. The nasolacrimal duct retaining portion 115 is a cylindrical passage formed on the posterior side of the maxillae bone portion 141, and holds the inserted nasolacrimal duct portion 132 so that its lower end reaches the nasal cavity opening 112 without crushing it. The nasolacrimal duct retaining portion 115 is formed by simplifying and modifying a part of the bone around the lacrimal sac fossa and maxillary sinus.

[0030] As shown in Figures 5 and 6, the skin model 102 is formed from a soft material such as silicone resin to mimic the shape of the skin and muscles of a human face. It has eye-like parts 121 that mimic the left and right eyes, covering the orbital opening 111, and a nose-like part 122 that mimics the nose, covering the nasal opening 112. Near the inner corner of the eye of the eye-like part 121, there is an upper lacrimal punctum opening 121a that mimics the upper lacrimal punctum and a lower lacrimal punctum opening 121b that mimics the lower lacrimal punctum. The nose-like part 122 has a nasal passage 122a that penetrates to the back side.

[0031] The underside of the skin model 102 has a shape that is almost complementary to the surface of the skull model 101. Furthermore, a groove 127 is formed at the upper end of the skin model, into which the upper end of the skull model 101 can be inserted. Therefore, the skin model 102 can be easily placed over the surface of the skull model 101 and prevented from shifting. However, since the skin model 102 is not glued to the skull model 101, it is possible to reproduce a state where, similar to real muscles and skin, applying force to the skin model 102 causes a certain degree of deformation and movement relative to the skull model 101.

[0032] On the back surface of the eye-like portion 121 of the skin model 102, an orbital insertion projection 123 is formed, which is inserted into the orbital opening 111. The orbital insertion projection 123 has a skin model-side holding portion that holds the lacrimal duct model 103. In this embodiment, the skin model-side holding portion is formed as an upper lacrimal canaliculus holding portion 125 through which the upper lacrimal canaliculus portion 133 is inserted, and a lower lacrimal canaliculus holding portion 126 into which the lower lacrimal canaliculus portion 134 is inserted. The upper lacrimal canaliculus holding portion 125 is a through hole connecting a recess 123c formed on the nasal portion 122 side (inner side) of the orbital insertion projection 123 and an upper notch 123a formed on the upper part of the orbital insertion projection 123. The lower lacrimal canaliculus holding portion 126 is a through hole connecting the recess 123c and a lower notch 123b formed on the lower part of the orbital insertion projection 123.

[0033] As shown in Figure 7, the lacrimal duct model 103 is held on the back side of the skin model 102 by inserting the superior lacrimal canaliculus portion 133 and the inferior lacrimal canaliculus portion 134 into the superior lacrimal canaliculus holding portion 125 and the inferior lacrimal canaliculus holding portion 126. The upper holding portion 135 is positioned in the upper notch 123a, the lower holding portion 136 is positioned in the lower notch 123b, and the lacrimal sac portion 131 is positioned in the recess 123c. In this state, the terminal opening 133a of the superior lacrimal canaliculus portion communicates with the superior lacrimal punctum opening 121a, and the terminal opening 134a of the inferior lacrimal canaliculus portion communicates with the inferior lacrimal punctum opening 121b.

[0034] As shown in Figure 8, when the orbital insertion projection 123 of the skin model 102 with the lacrimal duct model 103 attached is inserted into the orbital opening 111, the upper retaining portion 113 is connected to the upper retained portion 135 while inserted into the upper notch 123a, and the lower retaining portion is connected to the lower retained portion 136 while inserted into the lower notch 123b. The lacrimal sac portion 131 is sandwiched between the orbital insertion projection 123 and the bone surrounding the lacrimal sac. Note that Figure 8 shows the state with the lacrimal duct model 103 attached only to the left side.

[0035] The superior lacrimal canaliculus portion 133 and the inferior lacrimal canaliculus portion 134 are held by orbital insertion protrusions 123 of the skin model 102, which mimics muscle tissue, and do not come into contact with the rigid skull model 101. Therefore, when force is applied to the superior lacrimal canaliculus portion 133 and the inferior lacrimal canaliculus portion 134, they can deform together with the relatively soft orbital insertion protrusions 123 surrounding them. Furthermore, since the superior lacrimal canaliculus portion 133 and the inferior lacrimal canaliculus portion 134 are not adhered to the superior lacrimal canaliculus retaining portion 125 and the inferior lacrimal canaliculus retaining portion 126 but are only frictionally engaged, they can also slide against the superior lacrimal canaliculus retaining portion 125 and the inferior lacrimal canaliculus retaining portion 126. Therefore, the superior lacrimal canaliculus portion 133 and the inferior lacrimal canaliculus portion 134 can be flexibly deformed while being supported by the elastic skin model 102.

[0036] On the other hand, the upper retaining portion 135 and the lower retaining portion 136, provided on the superior lacrimal canaliculus portion 133 and the inferior lacrimal canaliculus portion 134, respectively, are fixed to the skull model 101, not to the skin model 102. In addition, the lacrimal sac portion 131 side, which is inside the superior lacrimal canaliculus portion 133 and the inferior lacrimal canaliculus portion 134, is in contact with the skull model 101 at least in part. Therefore, the sliding range of the superior lacrimal canaliculus portion 133 and the inferior lacrimal canaliculus portion 134 is limited by the skull model 101, and the deformability can be reproduced to the same extent as that of the actual superior and inferior lacrimal canaliculus. The upper retaining portion 135 and the lower retaining portion 136 can be provided on the superior lacrimal canaliculus portion 133 and the inferior lacrimal canaliculus portion 134, but from the viewpoint of making it closer to the state of the actual lacrimal canaliculus, it is preferable to provide them on the terminal portions of the superior lacrimal canaliculus portion 133 and the inferior lacrimal canaliculus portion 134.

[0037] The nasolacrimal duct portion 132, inserted into the nasolacrimal duct retaining portion 115, is surrounded by the relatively rigid nasolacrimal duct retaining portion 115, which mimics bone. Therefore, even when force is applied to the nasolacrimal duct portion 132, the surrounding nasolacrimal duct retaining portion 115 hardly deforms, making the nasolacrimal duct portion 132 less prone to deformation or movement compared to the lacrimal canaliculus portion. This allows for a better reproduction of the real nasolacrimal duct, which is surrounded by a bony nasolacrimal duct and is less prone to deformation.

[0038] Thus, the lacrimal duct treatment training device of this embodiment can not only reproduce the shape of the lacrimal duct, but also reproduce the mechanical characteristics of the lacrimal duct, such as having relatively soft and easily deformable superior and inferior lacrimal canaliculi and a relatively firm nasolacrimal duct. Therefore, it is possible to perform more realistic and advanced training.

[0039] In this embodiment, the upper retained portion 135 and the lower retained portion 136 are rod-shaped with flange-like large-diameter portions 135a and 136a, while the upper retaining portion 113 and the lower retaining portion 114 are formed in a cylindrical shape with slots 113a and 114a on their sides and irregularities on their inner surfaces that sandwich the large-diameter portions 135a and 136a. With this configuration, by fitting the corresponding retaining portions 113 and 114 into the notches 123a and 123b where the retained portions 135 and 136 are located, the retained portions 135 and 136 are inserted through the slots 113a and 114a on the sides of the retaining portions 113 and 114. This makes it easy to connect the retaining portions 113 and 114 with the retained portions 135 and 136. However, the upper and lower retained parts and retaining parts are not limited to this configuration, and various configurations capable of holding the upper lacrimal canaliculus 133 and the lower lacrimal canaliculus 134 can be adopted.

[0040] It is preferable that the upper retaining portion 135 and the lower retaining portion 136 are held by the skull model 101 outside of the terminal opening 133a of the superior lacrimal canaliculus and the terminal opening 134a of the inferior lacrimal canaliculus. Furthermore, it is preferable that the upper retaining portion 135 is held by the skull model 101 above the position of the superior lacrimal canaliculus 133, and the lower retaining portion 136 is held by the skull model 101 below the position of the inferior lacrimal canaliculus 134. With this configuration, when inserting a lacrimal duct tube or the like into the superior lacrimal canaliculus 133 and inferior lacrimal canaliculus 134 from the superior lacrimal punctal opening 121a and inferior lacrimal punctal opening 121b, it is possible to create a sensation close to that of the actual superior and inferior lacrimal canaliculus.

[0041] In this embodiment, the nasolacrimal duct retaining portion 115 does not completely cover the side of the nasolacrimal duct portion 132, and an opening window exists. This facilitates the insertion of the nasolacrimal duct portion 132. It also prevents the nasolacrimal duct retaining portion 115 from pressing too hard on the nasolacrimal duct portion 132. However, a configuration without such an opening window is also possible. Furthermore, the nasolacrimal duct retaining portion 115 is not limited to a cylindrical structure into which the nasolacrimal duct portion 132 can be inserted, but can be configured in various ways to guide the nasolacrimal duct terminal opening 132a to the vicinity of the nasal cavity opening 112. For example, it can be a groove-shaped passage, a configuration that sandwiches it between multiple protrusions, or a configuration using multiple clips, etc.

[0042] In this embodiment, the skin model-side holding portion is configured such that the superior lacrimal canaliculus holding portion 125 and the inferior lacrimal canaliculus holding portion 126 are through holes opening on the side surface of the orbital insertion projection 123. This configuration allows for the reproduction of the actual structure of the superior and inferior lacrimal canaliculi surrounded by muscle tissue. However, the skin model-side holding portion is not limited to this configuration, and various configurations can be adopted to hold the superior lacrimal canaliculus portion 133 and the inferior lacrimal canaliculus portion 134 in the skin model 102. For example, the superior lacrimal canaliculus holding portion 125 and the inferior lacrimal canaliculus holding portion 126 can be formed on the back side of the skin model 102 and can be grooves into which the superior lacrimal canaliculus portion 133 and the inferior lacrimal canaliculus portion 134 can be inserted. By using grooves, the attachment of the superior lacrimal canaliculus portion 133 and the inferior lacrimal canaliculus portion 134 becomes easier.

[0043] In this embodiment, the superior lacrimal canaliculi 133 and the inferior lacrimal canaliculi 134 are preferably transparent or semi-transparent, and the lacrimal sac 131 and nasolacrimal duct 132 are preferably less transparent than the lacrimal canaliculi and more preferably colored to a color close to that of muscle tissue. This allows for a realistic appearance of the lacrimal duct when a lacrimal duct endoscope is inserted. It is also preferable that the skin model 102 be colored to a color close to that of real muscle tissue.

[0044] In this embodiment, the skull model 101 and the skin model 102 reproduce the maxilla, frontal bone, and zygomatic bone. By reproducing a relatively wide area of ​​the face in this way, training can be conducted under conditions close to reality. However, training can be performed as long as the area in which the lacrimal duct model 103 can be placed is reproduced. In addition, although both left and right lacrimal ducts are reproduced in this embodiment, a model that reproduces only one side can also be used.

[0045] The lacrimal duct treatment training device of this embodiment reproduces not only the shape of the lacrimal duct but also its mechanical properties, allowing for more realistic simulation and training of procedures such as inserting a lacrimal duct tube using a bougie or lacrimal duct endoscope. Furthermore, since the skull model 101, skin model 102, and lacrimal duct model 103 are independent, training in procedures to open the lacrimal duct can be performed by changing the lacrimal duct model 103 from one that is not obstructed to one that is obstructed. The obstructed portion can be placed in various positions, allowing for training in simulating various pathological conditions. Moreover, the lacrimal duct treatment training device of this disclosure can be used for training in various procedures on the lacrimal duct, such as training in removing a lacrimal duct tube, training in collecting tissue samples under lacrimal duct endoscopy, and training in administering drug solutions to the lacrimal duct. [Industrial applicability]

[0046] The lacrimal duct procedure training device disclosed herein facilitates training in various procedures on the lacrimal duct, such as lacrimal duct opening and lacrimal duct tube placement, and is useful in the medical field. [Explanation of symbols]

[0047] 101 Skull Models 102 Skin Model 103 Tear duct model 111 Orbital opening 112 Nasal cavity opening 113 Upper holding part 113a slot 114 Lower holding part 114a slot 115 Nasolacrimal duct retaining part 121 Eyelet 121a Dilation of the superior lacrimal punctum 121b Inferior punctal opening 122 Nasal part 122a Nasal passages 123 Orbital insertion protrusion 123a Upper notch 123b Lower notch 123c recessed area 125 Superior lacrimal canaliculus retention area 126 Inferior lacrimal canaliculus retention area 127 Groove 131 Lacrimal sac 132 Nasolacrimal duct 132a End opening of the nasolacrimal duct 133 Superior lacrimal canaliculus 133a Terminal opening of superior lacrimal canaliculus 134 Inferior lacrimal canaliculus 134a Inferior lacrimal canaliculus terminal opening 135 Upper held part 135a Large diameter section 136 Lower held part 136a Large diameter section 141 Maxillary bone 142 Cheekbone area 143 Mandibular bone 144 Frontal bone

Claims

1. The device comprises a skull model, a skin model covering the outside of the skull model, and a lacrimal duct model held by the skull model and the skin model. The lacrimal duct model comprises a lacrimal sac portion, a nasolacrimal duct portion extending downward from the lacrimal sac portion, and superior and inferior lacrimal canaliculi portion extending laterally from the lacrimal sac portion. The skin model has an eye-like portion that includes an orbital insertion projection that is inserted into an orbital opening provided in the skull model. The orbital insertion projection has a skin model-side holding portion that holds the upper lacrimal canaliculus and the lower lacrimal canaliculus, in a lacrimal duct treatment training device.

2. The lacrimal duct model has an upper holding portion formed at the end of the superior lacrimal canaliculus and a lower holding portion formed at the end of the inferior lacrimal canaliculus. The skull model has an upper holding portion for holding the upper part to be held, a lower holding portion for holding the lower part to be held, and a nasolacrimal duct holding portion for holding the nasolacrimal duct. The lacrimal duct treatment training device according to claim 1, wherein the eye-like portion has an upper lacrimal canaliculus holding portion for holding the upper lacrimal canaliculus portion which constitutes the skin model side holding portion and a lower lacrimal canaliculus holding portion for holding the lower lacrimal canaliculus portion, and an upper lacrimal punctal opening communicating with the terminal opening of the upper lacrimal canaliculus portion and a lower lacrimal punctal opening communicating with the terminal opening of the lower lacrimal canaliculus portion.

3. The lacrimal duct treatment training device according to claim 2, wherein the upper lacrimal canaliculus holding portion and the lower lacrimal canaliculus holding portion are through holes extending along the back surface of the skin model into which the upper lacrimal canaliculus portion and the lower lacrimal canaliculus portion are respectively inserted.

4. The upper retained portion protrudes upward from the end of the upper lacrimal canaliculus portion, The lower retained portion protrudes downward from the end of the lower lacrimal canaliculus portion. The upper retaining portion protrudes downward from the upper part of the orbital opening, The lacrimal duct treatment training device according to claim 2 or 3, wherein the lower holding portion protrudes upward from the lower part of the orbital opening.

5. The nasolacrimal duct retaining portion is formed in a cylindrical shape on the back side of the maxilla portion, surrounding the nasolacrimal duct portion. The lacrimal duct treatment training device according to any one of claims 2 to 4, wherein the lower end of the inserted nasolacrimal duct portion reaches the nasal cavity opening formed in the skull model.

6. The lacrimal duct treatment training device according to any one of claims 1 to 5, wherein the lacrimal duct model is detachably held in place of the skull model and the skin model.

7. A lacrimal duct model to be attached to a lacrimal duct treatment training device having a skull model and a skin model, The lacrimal duct model comprises a lacrimal sac portion, a nasolacrimal duct portion extending downward from the lacrimal sac portion, and superior and inferior lacrimal canaliculi portion extending laterally from the lacrimal sac portion. The skin model has an orbital insertion projection that is inserted into the orbital opening provided in the skull model, A lacrimal duct model in which the superior lacrimal canaliculus portion and the inferior lacrimal canaliculus portion are surrounded by orbital insertion protrusions provided on the skin model and held by the skull model and the skin model.

8. It has an upper holding portion formed in the upper lacrimal canaliculus and a lower holding portion formed in the lower lacrimal canaliculus, The upper and lower holding portions are held by the upper and lower holding portions formed in the skull model, and the nasolacrimal duct portion is held by the nasolacrimal duct holding portion formed in the skull model. The lacrimal duct model according to claim 7, wherein the upper lacrimal canaliculus portion and the lower lacrimal canaliculus portion are held by the upper lacrimal canaliculus retaining portion and the lower lacrimal canaliculus retaining portion formed in the skin model.

9. The lacrimal duct model according to claim 7 or 8, wherein the superior lacrimal canaliculi and the inferior lacrimal canaliculi are more transparent than the lacrimal sac and the nasolacrimal duct.

10. The lacrimal duct model according to any one of claims 7 to 9, wherein the tubular passage between the terminal openings of the superior lacrimal canaliculus and the inferior lacrimal canaliculus and the terminal opening of the nasolacrimal duct has an intermittently openable occlusion.

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