Abstract:
An organ model for endoscope includes: a basic shape part formed by imitating a shape of a tubular organ; and a tissue holding part that holds a tissue piece and is detachably provided with respect to the basic shape part. The tissue holding part includes: a main body that is formed in a tubular shape and has a window part communicating with an internal space, on an outer peripheral surface; and a fixing member that fixes the tissue piece on the main body such that at least a portion of the tissue piece overlaps the window part. The main body is rotatable in a circumferential direction of the main body with respect to the basic shape part, in a state where the main body is attached to the basic shape part.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application is a continuation application based on a PCT Patent Application No. PCT/JP2015/065548, filed on May 29, 2015, whose priority is claimed on Japanese Patent Application No. 2014-116808, filed on Jun. 5, 2014, the entire content of which are hereby incorporated by reference. 
     
    
     BACKGROUND OF THE INVENTION 
       [0002]    Field of the Invention 
         [0003]    The present invention relates to an organ model for endoscope, and more specifically, to an organ model for endoscope used for training for the operation of a flexible endoscope or the like, performance evaluation of the flexible endoscope or the like, or the like. 
         [0004]    Description of the Related Art 
         [0005]    In the related art, in training for the operation of a flexible endoscope or the like, performance evaluation of the flexible endoscope or the like, or the like, organ models for endoscope formed by imitating internal organs of humans are used. 
         [0006]    Such organ models for endoscope are also used for training for various endoscope operations. However, in training of procedures, such as endoscopic mucous membrane dissection or suturing, it is necessary to use actual internal organ tissue. Therefore, it is more general to configure at least a portion where a procedure is performed, using sections of internal organ tissues of pigs, cows, or the like. 
         [0007]    An incision dissection model for endoscope, including an imitation internal organ having the shape of a predetermined internal organ, and a fixing frame that can fix mucous membrane tissue, is described in Japanese Unexamined Patent Application, First Publication No. 2006-116206. The fixing frame is incorporated into a window provided in the imitation internal organ. 
       SUMMARY 
       [0008]    According to a first aspect of the invention, there is provided an organ model for endoscope including a basic shape part formed by imitating the shape of a tubular organ; and a tissue holding part that holds a tissue piece and is detachably provided with respect to the basic shape part. The tissue holding part includes a main body that is formed in a tubular shape and has a window part communicating with an internal space, on an outer peripheral surface, and a fixing member that fixes the tissue piece on the main body such that at least a portion of the tissue piece overlaps the window part. The main body is rotatable in a circumferential direction of the main body with respect to the basic shape part, in a state where the main body is attached to the basic shape part. 
         [0009]    According to a second aspect of the invention, in the organ model for endoscope of the first aspect, the fixing member may have a projection part, and the main body may have a fixing hole that communicates with the internal space and allows projection part to enter thereinto. 
         [0010]    According to a third aspect of the invention, in the organ model for endoscope of the second aspect, the fixing hole may be provided at a position that does not overlap the window part in an axial direction of the main body. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0011]      FIG. 1  is a view illustrating an organ model for endoscope related to an embodiment of the invention. 
           [0012]      FIG. 2  is an enlarged view illustrating a tissue holding part and its periphery of the organ model for endoscope. 
           [0013]      FIG. 3  is a sectional view taken along line I-I of  FIG. 2 . 
           [0014]      FIG. 4  is a sectional view taken along line II-II of  FIG. 2 . 
           [0015]      FIG. 5  is a view illustrating a main body of the tissue holding part. 
           [0016]      FIG. 6  is a view illustrating an example of a recording jig. 
           [0017]      FIG. 7  is a view illustrating an example of a recording jig. 
           [0018]      FIG. 8  is a view illustrating a modification example of the organ model for endoscope related to the invention. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0019]    An embodiment of the invention will be described with reference to  FIGS. 1 to 7 . 
         [0020]      FIG. 1  is a view illustrating a housing  100  with that an organ model  1  for endoscope of the present embodiment is housed. The housing  100  is formed in a shape that imitates the body of a human, using resin or the like, and has an internal space  101  capable of housing the organ model  1  for endoscope. The organ model  1  for endoscope is a model that imitates the large intestine (tubular organ) of a human, and includes a tubular flexible part (basic shape part)  10  formed by imitating the large intestine, and a tissue holding part  20  that is rotatably attached to and detached from the flexible part  10 . 
         [0021]    The flexible part  10  is formed using, for example, flexible materials, such as silicone, and defines a basic shape of the organ model  1  for endoscope. The flexible part  10  has a first flexible part  11  that imitates the large intestine on a proximal side, and a second flexible part  12  that imitates the large intestine on the distal side. One end of the second flexible part  12  is connected to a hole (not illustrated) provided in the housing  100 . Since the hole to which the second flexible part  12  is connected is provided at a position of the housing  100  equivalent to the anus, training or evaluation regarding an insertion procedure of an endoscope can be performed by disposing the flexible part  10  in the internal space  101  of the housing  100 , similar to a traveling aspect of the large intestine of a human. 
         [0022]      FIG. 2  is an enlarged view illustrating the tissue holding part  20  and its periphery.  FIG. 3  is a sectional view taken along line I-I of  FIG. 2 , and  FIG. 4  is a sectional view taken along line II-II of  FIG. 2 . 
         [0023]    The tissue holding part  20  includes a substantially cylindrical main body  21 , and fixing members  26  attached to the main body  21 .  FIG. 5  is a plan view of the main body  21 . An window part  22  for exposing tissue the inside of the organ model  1  for endoscope and four fixing holes  23  provided around the window part  22  are provided in the main body  21  so as to communicate with the internal space through a peripheral wall of the main body  21 . 
         [0024]    The dimensions of the window part  22  may be appropriately set in consideration of what size of tissue is desired to expose to the inside of the organ model  1  for endoscope. Additionally, the shape of the window part is also not limited to a quadrangular shape, and may be set appropriately. However, it is preferable that a dimension D 1  of the window part in a circumferential direction of the main body  21  is approximately equal to or smaller than ¼ of the outer peripheral length of the main body  21 . If the dimension of the window part in the circumferential direction of the main body is too large, a support state of tissue to be exposed to the window part may become unnatural. As a result, there may be deviation from actual internal organs, which is not preferable. 
         [0025]    In the present embodiment, the fixing holes  23  are provided at positions that do not overlap the window part  22  in any of the axial direction and the circumferential direction of the main body  21 . Although the number of the fixing holes  23  or positions where the fixing holes  23  are provided are set appropriately, it is preferable if the fixing holes are provided at least at the positions that do not overlap the window part  22  in the axial direction of the main body  21  because the fixing members  26  are easily disposed so as not to overlap the window part  22 . 
         [0026]    A fixation margin D 2  that is a distance between the fixing holes  23  and the window part  22  is equal to or greater than, for example, 3 mm, tissue can be suitably held by the main body. If the shape of the fixing holes is set to be longer in the circumferential direction than in the axial direction of the main body  21 , t becomes easy to absorb errors in a fixing operation to be described below, which is preferable. 
         [0027]    The fixing members  26  have a stringy or beltlike band part  27 , and projection parts  28  provided on the band part  27 . The band part  27  can be formed of resin, cloth, or the like, and can be formed in an annular shape, thereby clamping a tissue piece disposed on an outer peripheral surface of the main body  21 . The projection parts  28  have a shape capable of entering the fixing holes  23 . 
         [0028]    As illustrated in  FIG. 2 , tubular connecting members  30  are attached to end parts of the first flexible part  11  and the second flexible part  12 . There is no particular limitation to connection aspects between the connecting members  30  and the flexible part  10 . For example, the end parts of the flexible part  10  may be expanded and fitted into the connecting members, or the connecting members may be bonded connected to the flexible part  10 . 
         [0029]    The internal diameter of the connecting members  30  is slightly greater than the external diameter of the main body  21 . If end parts of the main body  21  are made to enter the connecting members  30 , light friction occurs between inner surfaces of the connecting members  30  and an outer surface of the main body  21 , and the flexible part  10  and the tissue holding part  20  are engaged with each other. The tissue holding part  20  can be rotated around a shaft of the main body  21  with respect to the engaged flexible part  10  by applying a predetermined force. 
         [0030]    The operation when the organ model  1  for endoscope of the present embodiment configured described above is used will be described. 
         [0031]    First, a tissue piece to be attached to the tissue holding part  20  is prepared. A tissue piece of a size such that the window part  22  and all the fixing holes  23  are covered is cut out from an internal organ or the like of an animal that is appropriately selected in consideration of procedures, sites, or the like. 
         [0032]    Next, a surface of a tissue piece that is desired to be exposed to the inside of the organ model, and the outer peripheral surface or the like of the main body  21  are made to face each other, and a tissue piece TP is disposed on the outer peripheral surface of the main body  21  so as to overlap the window part  22  and the fixing holes  23 . Subsequently, the two fixing members  26  are annularly attached with the projection parts  28  being made to face the tissue piece TP, and the tissue piece TP is clamped to the main body  21 . In this case, the positions of the projection parts  28  and the positions of the fixing holes  23  are aligned with each other, and the fixing members  26  are attached such that the projection parts  28  enter the fixing holes  23 . The fixation of the tissue piece TP to the tissue holding part  20  is completed above. 
         [0033]    In a state where the tissue piece TP is fixed to the tissue holding part  20 , as illustrated in  FIG. 4 , portions of the tissue piece TP are pushed by the projection parts  28  of the fixing members  26 , and enter the fixing holes  23 . Accordingly, the tissue piece TP is suitably prevented from deviating in the circumferential direction and in the longitudinal direction of the main body  21  with respect to the main body  21 . Additionally, portions of the tissue piece TP, as illustrated in  FIG. 3 , are exposed the inside of the organ model  1  for endoscope from the window part  22 , in a state where a tension is moderately applied, and is supported in a state where a procedure is performed by the endoscope inserted into the flexible part  10 . 
         [0034]    After the tissue piece TP is fixed to the tissue holding part  20 , both of the end parts of the main body  21  are made to enter the connecting members  30  that are respectively attached to the first flexible part  11  and the second flexible part. Accordingly, the tissue holding part  20  and the flexible part  10  are engaged with each other, and the first flexible part  11  and the second flexible part  12  are integrally connected via the tissue holding part  20 . If the tissue holding part  20  is rotated in the circumferential direction of the main body  21  with respect to the flexible part  10  and the window part  22  is moved to a desired position if necessary, the organ model  1  for endoscope is brought into an available state. 
         [0035]    A user can perform various kinds of training or performance evaluation (hereinafter referred to as “training or the like”) of the endoscope, the treatment tool, or the like by inserting the endoscope into the flexible part  10  or performing a procedure on the tissue exposed from the window part  22  using the treatment tool inserted into the endoscope. In a case where training regarding a procedure or the like is performed, the training or the like can be continuously performed by preparing a plurality of the tissue holding parts  20  to which tissue pieces are fixed in advance, and by sequentially replacing the tissue holding parts with each other. In a case where training is performed using a treatment tool, such as a high-frequency knife, to be energized, energization to the tissue piece TP may be allowed by attaching opposite pole members having conductivity to the end parts of the tissue piece TP or connecting opposite pole members attached to separated positions and the tissue piece TP, with a gauze made to become wet with a physiological salt solution. 
         [0036]    Since nothing that supports the tissue piece TP exists on a side opposite to the side of the tissue piece TP exposed to the window part  22 , the state of a tension or the like to act on the tissue exposed to the window part  22 , is very similar to that of an actual internal organ. Therefore, for example, when training of ESD (endoscopic submucosal dissection) or the like is performed on the tissue piece TP, behavior, sensation, or the like of tissue when such an operation that a tip part of the endoscope is made to be hidden under a mucous membrane is performed is also obtained similar to a case where such as operation is performed on an actual patient. 
         [0037]    As described above, according to the organ model  1  for endoscope of the present embodiment, the tissue holding part  20  by which the tissue piece TP is held is rotatably attached around the axis with respect to the flexible part  10 , the window part  22  to which tissue is exposed can be moved at a desired position without rotating the flexible part  10 . As a result, various situations, such as a case where tissue to be subjected to a procedure is on a belly side or a case where tissue is on a back side, can be reproduced easily, and training or the like can be performed with diversity being guaranteed with an easy operation. 
         [0038]    When training or the like is performed using the organ model  1  for endoscope, tissue may be not necessarily fixed to the tissue holding part. For example, paper or the like is fixed to the tissue holding part, and a recording jig that can leave the track of a tip on the paper or the like instead of a treatment tool, such as a high-frequency knife, is inserted into a channel of the endoscope. By operating the recording jig protruded from the tip of the endoscope in this state, the track of the tip of the recording jig can be recorded on the paper, and the training or the like can be performed. 
         [0039]    Examples of the recording jig are illustrated in  FIGS. 6 and 7 . A recording jig  50 A illustrated in  FIG. 6  and a recording jig  50 B illustrated in  FIG. 7  has the same basic configuration. That is, the recording jigs includes an elongated insertion part  51  having flexibility, a drawing part provided at a tip part of the insertion part  51 , and a printing material supply part provided at a base end part of the insertion part  51 . 
         [0040]    The insertion part  51  is a tubular member having a dimension such that the insertion part is insertable into the channel of the endoscope, and an internal space thereof is filled with a printing material  54 , such as ink. The insertion part  51  is inserted through a sheath  55 . In the examples of the recording jigs  50 A and  50 B, the printing material supply part is a syringe  53 , and can supply the printing material  54  into the insertion part  51  by operating a piston  53   a.    
         [0041]    The configuration of the drawing part is not particularly limited as long as the drawing part can perform printing using the printing material  54  to be supplied from the insertion part  51 , and structures or the like of well-known pens and pencils can be adopted appropriately. A felt-pen-like drawing part  52 A is illustrated in  FIG. 6 , and a ball-point-like drawing part  52 B is illustrated in  FIG. 7 . 
         [0042]    While the organ model for endoscope of the invention has been described above using the one embodiment, the technical scope of the invention is not limited to the above embodiment. Combinations of constituent elements can be changed, various alternations can be added to the respective constituent elements, or omissions can be made, without departing from the concept of the invention. 
         [0043]    For example, in the invention, the basic shape part formed in imitation of the shape of an internal organ is not necessarily flexible. However, if the basic shape part is more flexible, training or the like can be performed with a sensation more similar to an actual internal organ, which is preferable. 
         [0044]    Additionally, by splitting the basic shape part into three or more and by attaching the connecting members to respective connection sites, thereby allowing the tissue holding part to be attached to two or more positions of the basic shape part, diversities, such as training, can be further improved. In this case, if the connecting members that face each other are configured so as to be capable of being coupled together without sandwiching the tissue holding part therebetween, a change in the position where the tissue holding part is attached becomes easy, which is more preferable. 
         [0045]    Moreover, a target internal organ is not limited to the large intestine, either. In an organ model  81  for endoscope of a modification example illustrated in  FIG. 8 , the tissue holding part  20  is attached to a position equivalent to a pyloric region of the basic shape part  82  that imitates the shape of the stomach. In the organ model  81  for endoscope, the tissue holding part  20  may be configured so as to be attached to a cardiac region. 
         [0046]    In addition, an example in which the main body of the tissue holding part enters the connecting members of the basic shape part, and both are connected together has been described in the above-described embodiment. However, instead of this, a configuration in which the internal diameter of a main body  21 A is made greater than the external diameter of a connecting member  30 A, and the connecting member  30 A enters the main body  21 A and both are connected together may be adopted as in the organ model  81  for endoscope illustrated in  FIG. 8 .