DEVICE FOR TEACHING TREATMENT OF SKELETON INJURIES

Abstract: A device for teaching treatment of a skeleton injury, said device comprising one or more artificial parts of the body (1) which are provided with one or more places of injury. The device is characterized in that a place of injury consists of two pipes (7, 8 and 12, 13 respectively) connecting to each other, a gaiter (18) of an elastic material extending across the place of injury, and that the device has means for stretching the gaiter (18). According to a preferred embodiment the pipes (7, 8 and 12, 13, respectively) inserted in a place of injury can be secured against bending by means of a locking pin (20).

Description: Device for teaching treatment of skeleton injuries This invention relates to a device for teaching treatment of a skeleton injury, said device comprising one or more artificial parts of the body which are pro¬ vided with one or more places of injury. A device of the kind mentioned above is previously known from Swedish Patent No. 7908218-6. However, this known device has a plurality of disadvantages. Th s, the place of injury of the known device cannot be locked, i.e. the artificial part of the body cannot be ____ made stiff in the region of the place of injury. As the device of the present invention preferably consists of an artificial part of the body with at least two places of injury, it is advantageous that the place of injury not being used can be locked, i.e. the part of the body can be made stiff in the region of said place of in¬ jury. Another disadvantage of the known device is that the means simulating muscles in the region of the place of injury are not adjustable in respect of the function of the muscles when the parts of the body on both sides of the place of injury are reciprocally skewed. The known device has also a drawback as to its lacking ability at a simulated fractured leg to permit turning of the parts located on both sides of the place of injury relative to each other in the longitudinal direction of the part of the body. It is the object of this invention to present a device which can simulate in a way as lifelike as pos¬ sible a skeleton fracture of a part of the body as far as the movability of the parts located on both sides of the place of injury relative to each other is concer¬ ned. Moreover, it must be possible to lock the places of injury not used in connection with the current teaching, i.e. it must be possible to make the part of the body stiff in the region of the place of injury. This object of the invention is realized by means of a device which has been given the characteristic features defined in the appended claims. An illustrative example of a device according to the invention will be described below with reference to the enclosed drawings, in which Fiσ. 1 shows a leg dum¬ my with two artificial places of injury, Fiσ. 2 shows a detail of a place of injury in a stiff state, and Fig. 3_ shows a detail of a place of injury where a fracture of the artificial part of the body has been simulated. The leg dummy 1 shown in Fig. 1 consists of two main parts, viz a lower leg part 2 and a thigh-bone part 3. The lower leg part 2 has an upper portion 4 and a lower portion 5 which are made of foamed shape perma¬ nent plastic. Between said portions 4, 5 there is ar¬ ranged a portion 6 of a non-rigid foamed plastic. In each of the portions 4 and 5 a pipe 7 and 8, respec- tively, are cast which connect to each other within the portion 6 of non-rigid foamed plastic, said connection being the artificial place of fracture which will be described below more in detail with reference to Figs. 2 and 3. In a way corresponding to the lower leg part 2 the thigh-bone part has an upper portion 9 and a lower por¬ tion 10 which are also made of a foamed shape permanent plastic. A connecting portion 11 of non-rigid foamed plastic is disposed between these portions. In each of the upper and lower portions 9 and 10 pipes 12 and 13, respectively, are cast which connect to each other within the connecting portion 11, said connection being made in a way corresponding to that which will be de¬ scribed more in detail with reference to Figs. 2 and 3. As is apparent from Fig. 1 the pipes 7 and 13 are combined to each other by a joint 14 which, thus, forms the knee-joint of the leg dummy 1 according to the in¬ vention. The build-up of the artificial place of fracture is apparent more in detail from the lower leg part 2 shown in Fig. 2. As is evident from Fig. 2 the pipe 8 is provided with an external thread 15 at its upper end which, thus, is located within the connecting portion 6, an internally threaded sleeve 16 being arranged on said thread 15. The pipe 7 which, thus, is cast in the upper portion 4 has at its lower end a fixed collar 17 which has a larger inside diameter than the pipe 8. It is suitable that the upper end of the pipe 8 and the free end of the collar 17 are provided with bevels adapted to each other so that a good guiding coopera- tion is obtained between these portions. A gaiter 18 of elastic material, for example rubber, is arranged on the outside of the sleeve 16 and the collar 17, the end portions of the gaiter 18 being clamped to the sleeve 16 and collar 17, respectively, by means of hose clips 19. It is immediately apprecia¬ ted that if the pipe 8 is rotated and then also the lower portion 5 cast with the pipe the sleeve 16 will be moved upwards or downwards along the outer thread 15, a rotation of the sleeve 16 being prevented by the rubber gaiter 18. Thus, it is possible to adjust the length of the rubber gaiter 18, i.e. it is more or less extracted in its longitudinal direction. The purpose of this adjusting possibility will be explained later. As is apparent from Fig. 2 a locking pin 20 movab- le in its longitudinal direction is also arranged with¬ in the pipes 7 and 8. The locking pin 20 has preferably a non-circular outer cross-section, the pipes 7, 8 also having a non-circular inner cross-section which corre¬ sponds to the outer cross-section of the locking pin 20. The locking pin 20 is connected with a helical spring 21 exerting a tensile force and extending within the pin 20 where one of its ends is fastened while its other end is attached in the region of the upper end of the pipe 7. In the region of the lower end of the pin 20 a string 22 or the like is connected which, in turn, is lengthened by a chain 23 extending out of the lower end of the pipe 8 and ending with a holding ring 24. At its lower end the pipe 8 is provided with a notch 25 in which a link of the chain 23 can be inserted to lock the chain. In the position shown in Fig. 2 the pin 20 has been pulled downwards against the action of the spring 21 so that the pin 20 extends past the joint between the pipes 7 and 8, i.e. the contact position between the upper end of the pipe 8 and the collar 17. The pin 20 is fixed in this position as the chain 23 has been locked in the notch 25. Thus, as the pin 20 extends past the joint between the pipes 7 and 8 the lower leg part is stiff in this position, i.e. it cannot be bent in the region of the artificial place of fracture. In this position of the pin 20 the lower part 5 is also locked against rotation relative to the upper part 4 around the longitudinal axis of the leg dummy due to the non-circular cross-sections of the pin 20 and the pipes 7, 8. A simulated fracture on the lower leg part 2 of the leg dummy 1 according to the invention will now be described with reference to Fig. 3. In order to provide a simulated fracture in the lower leg part 2 the chain 23 is loosened from its locking in the notch 25, the locking pin 20 being pulled upwards into an inactive position by the action the spring 21, see Fig. 3. Thus, the pin 20 is located within the top of the pipe 7 and does not extend past the joint between the pipes 7 and 8. In this position of the locking pin 20 the pipe 8 with its associated lower portion 5 can be placed at an angle to pipe 20 with its associated portion 4 which is illustrated in Fig. 3. When the lower portion 5 of the lower leg part 2 is placed at an angle to the upper portion 4 a certain deformation of the connecting portion 6 will occur which, however, is easily done as this portion 6 is made of a non-rigid defor able foamed plastic. Thus, it is the object of the rubber gaiter 18 extending across the joint between the pipes 7 and 8 to keep together the upper portion 4 and the lower portion 5, the gaiter 18 having an elasticity by which the natural muscles of the leg are imitated thus keeping together the portions of the leg in its longitudinal direction in case of a fracture. The rubber gaiter 18 can be stretched by rotating the lower portion 5 with associated pipe 8 relative to the upper portion 4 with associated portion 7. In this way the gaiter 18 can be given a suitable extension so that it imitates the natural muscles of the leg as lifelike as possible. It should also be pointed out in this connection that the pipe 8 and consequently also the associated lower por¬ tion 5 can be turned out laterally, i.e. the pipe can rotate in the sleeve 16, after the locking pin has been transferred to an inactive position. This agrees as well with how a natural fracture appears as the muscles do not exert any retaining force worth mentioning against turning of the broken part around the longitu¬ dinal axis of the leg. According to a preferred embodiment of the inven¬ tion the leg dummy 1 of the invention can be provided with a signal device (not shown) which can be connected where a fracture is to be simulated and operates in such a way that a summer tone or the like is heard when the pipes 7 and 8 are in contact with each other, these portions corresponding to the broken leg ends at a real fracture. Thus, the summer signal indicates that the patient cries due to the pain arising when the broken leg ends get in contact with each other. In order to put this right the lower leg portion 2 must thus be stretched so that the lower portion 5 is somewhat with¬ drawn from the upper portion 4, the lower leg part 2 being put into splints in this position. Such a method corresponds extraordinarily well to the measure taken at a natural fracture, i.e. the leg is stretched and then put into splints in a stretched position. To ensure that the summer signal thus indicating pain of the person being treated will really stop when the lower portion 5 of the leg dummy is stretched the string 22 must be made of an electrically non-conduc- tive material. If the rubber gaiter 18 after being used for some time does not show enough pre-stress, i.e. it does not simulate satisfactorily the natural muscles of a leg the rubber gaiter can be further pre-stressed, as de- scribed above, by rotating the pipe 8 in a suitable di¬ rection, the sleeve 16 being moved downwards stretching the rubber gaiter. By the constructive design given to the leg dummy according to the invention a fracture can be simulated by the aid thereof in a way extraordinarily true to life which is of a great importance in order that those persons being trained by the aid of the leg dummy 1 ac¬ cording to the invention might recognize the situation when confronted with a real case. Thus, the illustrative example described above re¬ fers to a leg dummy which can simulate a fracture on a lower leg or a femur. However, the invention is not re¬ stricted to legs or the number of fracture places that can be simulated. It is also fully possible within the scope of the invention to manufacture for example an arm dummy or even a complete human body dummy by means of which besides leg and arm fractures for instance neck fractures can be simulated. Thus, the invention is by no means restricted to the illustrative example de¬ scribed above but can be freely varied within the scope of the following claims.

Claims: Claims 1. Device for teaching treatment of a skeleton in¬ jury, said device comprising one or more artificial parts (1) of the body provided with one or more places of injury, c h a r a c t e r i z e d in that the part (1) of the body has portions (4, 5 and 9, 10, re¬ spectively) of a shape permanent material on both sides of a place of injury, and that associated pairs of pipes (7, 8 and 12, 13, respectively) are arranged in the portions (4, 5 and 9, 10, respectively) of a shape permanent material, the ends of said pairs of pipes facing each other forming a place of injury, said de¬ vice comprising means (18, 19) applying a counter force to the pipes (7, 8 and 12, 13, respectively) when they are removed from each other, and that means (20, 21, 22, 23, 24, 25) are arranged in the region of the places of injury to lock releasably an associated pair of pipes (7, 8 and 12, 13, respectively) against being reciprocally skewed with regard to the longitudinal axis of the pipes. 2. The device of claim 1, c h a r a c t e ¬ r i z e d in that the counter means consist of a gaiter (18) of an elastic material, which is connected to the associated pairs of pipes (7, 8 and 12, 13, re- spectively) by clips (19) or the like. 3. The device of claim 1 or 2, c h a r a c t e ¬ r i z e d in that in associated pairs of pipes (7, 8 and 12, 13, respectively) the end of one pipe (8) is provided with an external thread (15), an internally threaded sleeve (16) being arranged on the external thread (15), and that the gaiter (18) is connected with the sleeve (16) with one of its ends. 4. The device .of any of the foregoing claims, c h a r a c t e r i z e d in that the ends of the associated pairs of pipes (7, 8 and 12, 13, respective¬ ly) are beveled for good reciprocal guiding, the diame- ters of the associated pipes (7, 8 and 12, 13, respec¬ tively) being somewhat different. 5. The device or any of the foregoing claims, c h a r a c t e r i z e d in that the locking means of the pipes (7, 8 and 12, 13, respectively) connected in pairs consist of a pin (20) movable within one of the pipes (7 and 12, respectively), said pin being movable against the action of a force in the longitudi¬ nal direction of the associated pipes (7, 8 and 12, 13, respectively) . 6. The device of claim 5, c h a r a c t e ¬ r i z e d in that the counter force is created by a spring (21) . 7. The device of any of claims 5 or 6, c h a - r a c t e r i z e d in that the pipes (7, 8 and 12, 13, respectively) have a non-circular inner cross-sec¬ tion and that the pin (20) has an outer non-circular cross-section corresponding to the inner cross-section of the pipes (7, 8 and 12, 13, respectively). 8. The device of any of the foregoing claims, c h a r a c t e r i z e d in that it comprises a sig¬ nal system, which can be caused to emit a signal when the associated pipes (7, 8 and 12, 13, respectively) are in contact with one another. 9. The device of claim 8, c h a r a c t e ¬ r i z e d in that the pin (20) is moved by means of a string (22, 23) or the like which runs out of one pipe (8 and 12, respectively) and can be fastened outside the pipe (8 and 12, respectively) and that at least the part (22) of the string located next to the pin is made of an electrically non-conductive material.

Inventors: LINDSKOG KJELL, SANDEGAORD JAN, LINDSKOG, KJELL, SANDEGAORD, JAN
Applicants: LINDSKOG KJELL, SANDEGAORD JAN, LINDSKOG, KJELL, SANDEGAORD, JAN
Application year: 1986
Main classification: G09B23
IPC codes: A61F2, G09B23