JP5906891B2 - Artificial lung protective cover - Google Patents

Description

  The present invention relates to a protective cover attached to an oxygenator body of an oxygenator, and more particularly to a protective cover having a configuration that can be adapted to an oxygenator body of different thickness.

  In cardiac surgery, a heart-lung machine is used to stop the patient's heart and perform the respiratory and circulatory functions during that time. Artificial lungs provide extracorporeal blood circulation by supplying oxygen to the blood on behalf of the patient's lungs and discharging carbon dioxide.

  The oxygenator has a gas exchange part, and an element for gas exchange (for example, a hollow fiber bundle) is built in the housing. In general, a structure in which a heat exchanging unit is added to a gas exchanging unit is often employed. A heat exchange pipe is disposed in the heat exchange section. A blood flow path that penetrates across the heat exchange section and the gas exchange section is formed, and blood flows in the order of the heat exchange section and the gas exchange section. Cold and hot water is flowed through the pipe for heat exchange, and oxygen-containing gas is flowed through the hollow fiber bundle. Therefore, the temperature of the blood passing through the blood channel is adjusted by the heat exchange unit, and the gas exchange unit absorbs oxygen and discharges carbon dioxide gas by gas exchange.

  In such an artificial lung, the gas exchange part and the heat exchange part are structurally vulnerable to impact, and if the internal seal is broken by the impact, seal leakage may occur. In this case, blood contamination may occur due to blood leakage at the heat exchange unit or the gas exchange unit.

  In order to avoid such a situation, for example, Patent Document 1 discloses that a protective cover that protects the gas exchange unit and the heat exchange unit from an impact is attached to the artificial lung. The protective cover is configured to cover the gas exchange part and the heat exchange part, and can be divided for easy attachment. That is, the protective cover includes a first frame attached to the front side of the oxygenator body and a second frame attached to the rear side. The first frame is provided with an engagement claw, and the second frame is provided with an engagement hole. When the first frame is attached to the oxygenator body, the engagement claw and the engagement hole engage with each other. The frame is integrated to protect the oxygenator body from direct impact.

  In addition, the blood circuit for performing extracorporeal blood circulation requires a buffer function for adjusting the blood volume in the circuit and keeping the blood return volume constant together with the artificial lung. Furthermore, a line is also provided for returning blood after aspirating blood from the operative field and separating and removing foreign matter. Therefore, a blood reservoir is used for temporarily storing the blood that has been removed from blood and for temporarily storing blood that has been aspirated from the operative field. Accordingly, in an extracorporeal blood circulation circuit, a blood reservoir is generally used together with an oxygenator, and the extracorporeal circulation processing device in the following description means a device in which an artificial lung and a blood reservoir are combined.

  On the other hand, it is desirable to shorten the distance between the oxygenator and the blood reservoir, which are constituent elements of the extracorporeal circulation processing device, in order to secure the arrangement space for various devices in the operating room. In order to shorten the distance between the devices and for the convenience of handling when configuring the extracorporeal blood circulation circuit, it is desirable that the blood reservoir and the artificial lung can be connected and integrated.

  As described above, in order to connect the blood reservoir and the artificial lung, the first frame body of the protective cover is provided with a coupling portion for coupling with the coupling member. The coupling portion is provided on the upper portion of the first frame, and the connecting member and the artificial lung can be rotated with each other through fitting at the coupling portion. Thus, the protective cover has both a function for protecting the oxygenator body from impact and a function for coupling with a connecting member for connecting to the blood reservoir.

JP 2010-284201 A

  It is necessary to use an artificial lung having a size that matches the age, physique, etc. of the patient. Therefore, artificial lungs of a plurality of sizes are produced, and the protective cover as in the conventional example has to be produced in a plurality of sizes for each size of the artificial lung body.

  The only change in the shape of the protective cover necessary for adapting to different sized oxygenator bodies is the thickness of the oxygenator body in the thickness direction. Nevertheless, in order to produce a protective cover of a type corresponding to each size, each mold is produced and a separate manufacturing process is required. Therefore, in order to reduce manufacturing costs, it has been desired to share a protective cover so that it can be adapted to different sized artificial lung bodies.

  Therefore, an object of the present invention is to provide a protective cover for an artificial lung that can be easily adapted to a plurality of types of artificial lung bodies having different thicknesses.

In order to solve the above-described problem, the oxygenator protective cover according to the present invention is attached so as to cover at least a part of the oxygenator body in which a gas exchange chamber is formed. The first frame body includes first and second frames, one of which is disposed on the front surface side and the other of which is disposed on the rear surface side. A pair of left and right engaging pieces extending toward the frame, and engaging claws are provided at the ends of the engaging pieces, and the second frame is provided at the upper and lower ends respectively to the oxygenator body. A shoulder portion extending toward the first frame body in the mounted state is provided, and the shoulder portion is disposed so as to correspond to the engagement claw so that each of the engagement claws can be fitted. A plurality of engagement holes on the left and right sides, and the engagement holes of the second frame have a plurality of different distances from the first frame. The saw including a pair of left and right engagement holes of the second frame has an adjustment sidewall protruding toward the first frame to the side wall portions of the left and right, a boundary between the adjustment sidewall and said side wall portion Is characterized in that a separation boundary for facilitating removal of the adjustment side wall is formed .

  According to the above configuration, both the frame bodies are joined by the engagement of the engagement claw at the tip of the engagement piece provided in the first frame body and the engagement claw provided in the second frame body, and the first frame By including a plurality of pairs of left and right engagement holes in different distances from the body, it is possible to easily adapt to a plurality of types of oxygenator bodies having different thicknesses.

The side view of the extracorporeal circulation processing apparatus containing the oxygenator with which the protective cover in embodiment of this invention was mounted | worn The perspective view which shows the state seen from the front side of the structure which combined the artificial lung which is an element of an extracorporeal circulation processing apparatus, and the connection member. The perspective view which shows only the oxygenator which removed the connection member from the state of FIG. The perspective view which shows the state seen from the back side of the oxygenator The perspective view which shows the state which decomposed | disassembled into the oxygenator main body and the protective cover about the oxygenator shown in FIG. Side view showing the form of two types of artificial lung bodies with different thickness The perspective view which shows the state which decomposed | disassembled the protective cover into the 1st frame and the 2nd frame, and was seen from the back side The top view which shows the planar shape of the protective cover of the state of decomposition | disassembly of FIG. Side view showing two types of states of the second frame of the protective cover The perspective view which shows the state which decomposed | disassembled the protective cover about the oxygenator using the oxygenator main body of the thinner one shown in FIG. The perspective view for demonstrating the principal part of the 1st frame of the protective cover in embodiment of this invention The perspective view for demonstrating the principal part of the 2nd frame of the protection cover

  The protective cover for an artificial lung of the present invention can take the following aspects based on the above configuration.

  In other words, the second frame has adjustment side walls projecting toward the first frame on left and right side wall portions, and the adjustment side walls can be easily removed at the boundary between the adjustment side walls and the side wall portions. It can be set as the structure in which the isolation | separation boundary part to make was formed.

  The engaging claw forms a vertical convex portion that protrudes in a direction intersecting the surface of the engaging piece, and is a lateral direction that is a portion extending in the left-right direction on the inner peripheral edge of the engaging hole. It can be set as the structure which the said engaging claw and the said engagement hole engage by the said vertical direction convex part of the said engaging claw contact | abutting to an inner edge.

  In addition to the vertical convex portion, the engaging claw includes a horizontal convex portion protruding from one of the side ends of the engaging piece, and one of the lateral inner end edges of the engaging hole. A vertical edge extending in the vertical direction from the side is formed, and when the engagement claw and the engagement hole are engaged, the lateral protrusion of the engagement claw contacts the vertical edge. In order to release the engagement between the engagement claw and the engagement hole, the contact between the vertical projection and the lateral edge is removed in the vertical direction, and the horizontal projection and the It can be set as the structure which needs to remove | release the contact | abutting of a vertical direction edge in the left-right direction.

  In addition, the first or second frame may be provided with a connecting portion for connecting another medical device and the artificial lung.

  Embodiments of the present invention will be described below with reference to the drawings. In the following embodiment, a protective cover is disclosed by taking an artificial lung incorporated in an extracorporeal circulation processing apparatus as an example. However, the protective cover is not limited to the application to the oxygenator in such a mode, and can be applied to the oxygenator in various modes.

<Embodiment>
FIG. 1 is a side view showing an extracorporeal circulation processing apparatus including an artificial lung equipped with a protective cover according to an embodiment of the present invention. This extracorporeal circulation processing apparatus is used by being incorporated into an extracorporeal blood circulation circuit, and is configured by connecting a blood reservoir 1 and an artificial lung 2 by a connecting member 3. FIG. 2 is a perspective view seen from the front side of the structure in which the oxygenator 2 and the connecting member 3 are combined. The structure of only the artificial lung 2 from which the connecting member 3 is removed from the state of FIG. 2 is shown in a perspective view in FIG. FIG. 4 is a perspective view showing a state of the oxygenator as viewed from the back side. FIG. 5 is a perspective view showing a state in which the oxygenator shown in FIG. 4 is disassembled into an oxygenator body and a protective cover.

  As shown in FIG. 1, the blood reservoir 1 has a main body portion 4 and a lid (not shown) placed on the upper portion of the main body portion 4. The main body 4 has a blood storage chamber 5 that is formed so that a part of the bottom surface of the main body 4 protrudes downward. A blood outflow port 6 through which blood flows out is provided at the lower end of the blood storage chamber 5. . A support portion 7 is provided at a position separated from the blood storage chamber 5 on the bottom surface of the main body portion 4 so as to protrude downward. A lower portion of the support portion 7 forms a cylindrical coupling portion 8. A first fitting portion 9 provided on one end side of the connecting member 3 is fitted to the lower end side of the coupling portion 8. A second fitting portion 10 is provided on the other end side of the connecting member 3, and is fitted with a connecting portion 11 provided on the oxygenator 2. Thereby, the blood reservoir 1 and the artificial lung 2 are connected by the connecting member 3.

  The support portion 7 of the blood reservoir 1 further has a portion that is coupled to a holder 12 that constitutes a part of a support device for supporting the blood reservoir 1. The holder 12 can support the blood reservoir 1 in a desired state. In the blood reservoir 1, a venous blood filtration network that filters blood flowing from the venous blood flow inlet port is held in the tank, and bubbles are removed from the blood flowing from the intracardiac blood flow inlet port, as in a known configuration. Therefore, the cardiotomy section can be arranged.

  As shown in FIG. 2, the first fitting portion 9 of the connecting member 3 has a cylindrical inner peripheral surface 9a. The coupling portion 8 of the blood reservoir 1 shown in FIG. 1 is provided with a region for forming a cylindrical outer peripheral surface 8a, and the cylindrical inner peripheral surface 9a is fitted in this region. The connecting member 3 is rotatable with respect to the blood reservoir 1 through this fitting. The fitting structure of the coupling part 8 of the blood reservoir 1 and the first fitting part 9 of the connecting member 3 is not shown in the figure, but is provided, for example, in the coupling part 8 and has a cylindrical outer peripheral surface 8a and a cylindrical inner periphery. A mechanism for holding the fit of surface 9a is included.

  Moreover, the coupling | bond part 11 of the artificial lung 2 has a cylindrical outer peripheral surface as FIG. 3 etc. show, and the 2nd fitting part 10 of the connection member 3 fits the outer side. As a result, the connecting member 3 and the artificial lung 2 can be rotated relative to each other through fitting at the coupling portion 11. As shown in FIGS. 1 and 2, a locking lever 13 is provided on the upper side portion of the second fitting portion 10, and a detailed description thereof is omitted. The detachment of the fitting of the coupling portion 11 of the lung 2 is restricted.

  As shown in FIGS. 1 and 2, the connecting member 3 has a structure in which the first and second fitting portions 9, 10 are integrated, and the first fitting portion 9 has a central axis of rotation. The central axes of rotation of the second fitting portions 10 are parallel to each other, and are arranged with an interval between them. With such a connecting structure via the connecting member 3, the connecting member 3 and the blood reservoir 1 can rotate around a central axis extending in the vertical direction of the first fitting portion 9. In addition, the oxygenator 2 and the connecting member 3 can rotate around a central axis extending in the vertical direction of the second fitting portion 10. Therefore, the oxygenator 2 can rotate around the central axis of the second fitting part 10 and can revolve around the coupling part 8 of the blood reservoir 1. The position and posture of the oxygenator 2 with respect to the blood reservoir 1. High degree of freedom of adjustment can be obtained.

  As shown in FIG. 1, the artificial lung 2 has a heat exchange part 14 and a gas exchange part 15, and elements having well-known configurations for heat exchange and gas exchange are accommodated in the housing, respectively. That is, although illustration is omitted, a stainless pipe bundle for heat exchange is disposed in the inner cavity of the heat exchange section 14. A hollow fiber bundle that is a bundle of hollow fiber membranes is disposed in the lumen of the gas exchange unit 15. Both ends of the stainless steel pipe bundle and the hollow fiber bundle are exposed and filled with a seal member, and the lumen of the stainless steel pipe bundle and the hollow fiber bundle extends in a horizontal direction across the stainless pipe bundle and the hollow fiber bundle. A flow path is formed.

  Blood ports 16 and 17 for inflow and outflow of blood are provided on the outer shell wall of the housing corresponding to both ends of the blood flow path penetrating the heat exchange section 14 and the gas exchange section 15 in the horizontal direction. Cold and hot water ports 18 (see FIG. 2) and 19 for allowing cold water or hot water, which is a heat exchange liquid, to flow in and out are provided at the left and right ends of the heat exchange unit 14, respectively. Gas ports 20 and 21 for introducing and deriving oxygen-containing gas are provided at the upper and lower ends of the gas exchange unit 15, respectively.

  Cold water or hot water that is a heat exchange liquid flowing in from the cold / hot water port 18 enters from one end of each stainless steel pipe, and flows out from the cold / hot water port 19 via the other end of each stainless steel pipe. Meanwhile, heat exchange is performed with blood flowing through the blood flow path. On the other hand, the oxygen-containing gas flowing in from the gas port 20 enters from one end of each hollow fiber membrane, and flows out from the gas port 21 via the other end of each hollow fiber membrane. In the meantime, gas exchange is performed with blood flowing through the blood flow path.

  The configuration of the oxygenator 2 is an example, and the connection structure with the blood reservoir of the present embodiment can be applied even if the configuration is other than that. The artificial lung 2 is not limited to the heat exchange unit 14 and the gas exchange unit 15, and the connection structure of the present embodiment can be applied even if the artificial lung 2 is configured of only the gas exchange unit 15.

  As shown in FIG. 5, the oxygenator 2 has a structure in which a protective cover 23 is attached to the outside of the housing of the oxygenator main body 22. The protective cover 23 is a structure in which a first frame body 24 attached to the front surface side of the oxygenator body 22 and a second frame body 25 attached to the rear surface side are combined. On the upper portion of the first frame body 24, the above-described coupling portion 11 that couples to the coupling member 3 is provided. The first and second frame bodies 24 and 25 are provided with circular holes 24a and 25a, respectively, from which the blood ports 16 and 17 are projected.

  Engagement pieces 26 extending toward the second frame body 25 are provided at the upper and lower ends of the first frame body 24, and an engagement claw 27 is formed at the tip thereof. At the upper and lower ends of the second frame 25, shoulder portions 28 extending toward the first frame 24 are provided, and engagement holes 29 and 30 are formed. When the first and second frame bodies 24 and 25 are attached to the oxygenator main body 22, the engaging claws 27 engage with the engaging holes 29 or 30. By this engagement, the first and second frame bodies 24 and 25 are integrated and fixed to the oxygenator body 22.

  The protective cover 23 of the present embodiment having the above-described configuration is configured to be attachable to two types of oxygenator bodies 22A and 22B as shown in FIGS. 6 (a) and 6 (b). In the following description, when the matters common to the oxygenator bodies 22A and 22B are described, they are collectively referred to as the oxygenator body 22. The oxygenator bodies 22A and 22B basically have the same configuration as described above. The difference is that the thickness of the oxygenator body 22A in the blood flow path direction is larger than the thickness of the oxygenator body 22B.

  As described above, the configuration of the protective cover 23 that can be adapted to the two types of artificial lung bodies 22A and 22B having different thicknesses will be described with reference to FIGS. In the description of the present embodiment, the first frame body 24 is disposed on the front surface side of the artificial lung bodies 22A and 22B, and the second frame body 25 is disposed on the rear surface side. However, the effects described below are obtained. Therefore, the reverse arrangement may be used.

  First, as a basic configuration, as shown in FIG. 7, the engagement pieces 26 of the first frame body 24 are provided in a pair of left and right at the upper and lower ends, respectively, and are attached to the oxygenator body 22. Extending toward the second frame 25. The engagement claw 27 protrudes in a direction intersecting with the surface of the engagement piece 26 (a direction substantially orthogonal). In the figure, the engagement claw 27 protrudes upward in the engagement piece 26 at the upper end, and the engagement claw 27 protrudes downward in the engagement piece 26 at the lower end.

  The upper and lower shoulder portions 28 of the second frame body 25 are respectively arranged in correspondence with the engaging claws 27 and are provided in a pair of left and right engaging holes provided so that each of the engaging claws 27 can be fitted. 29 and 30 are provided. The pair of left and right engagement holes 29 in the first row are arranged at positions where the distance from the first frame body 24 is short. The pair of left and right engagement holes 30 in the second row are arranged at positions farther from the first frame body 24 than the engagement holes 29 in the first row.

  The engaging claws 27 of the first frame body 24 can selectively engage with the engaging holes 29 in the first row or the engaging holes 30 in the second row. In the state where the engaging claws 27 are engaged with the engaging holes 29 in the first row, the distance between the first frame body 24 and the second frame body 25 is large, and the thicker artificial lung shown in FIG. It can be appropriately mounted on the main body 22A. On the other hand, in a state where the engaging claws 27 are engaged with the engaging holes 30 in the second row, the distance between the first frame body 24 and the second frame body 25 is reduced, and the thinner one shown in FIG. Can be appropriately attached to the artificial lung body 22B. In this way, the protective cover 23 of the present embodiment can be appropriately attached to any of the two types of artificial lung bodies 22A and 22B having different thicknesses.

  As shown in FIG. 7 and the like, the left and right side wall portions 31 of the second frame body 25 are provided with adjustment side walls 32 projecting toward the first frame body 24. A separation boundary 33 is formed at the boundary between the adjustment side wall 32 and the side wall 31. The separation boundary portion 33 is composed of, for example, a shallow groove, a row of a plurality of holes, and the adjustment side wall 32 can be easily broken off at this portion. Alternatively, the adjustment side wall 32 may be formed of a fragile material so that it can be easily broken off. FIG. 9A shows a state where the adjustment side wall 32 is not removed, and FIG. 9B shows a state where the adjustment side wall 32 is removed.

  As described above, the distance between the side regions of the first frame body 24 and the second frame body 25 can be adjusted by the presence or absence of the adjustment side wall 32. When attached to the thick artificial lung main body 22A of FIG. 6A, as shown in FIG. 5, the protective cover 23 is used in a state where the adjustment side wall 32 of FIG. 9A is not removed. When attached to the thin oxygenator main body 22B of FIG. 6B, as shown in FIG. 10, the protective cover 23 is used in a state where the adjustment side wall 32 of FIG. 9B is removed. Thereby, when it mounts | wears with the thick oxygenator main body 22A, the gas exchange part 15a can be protected appropriately, and it can be mounted | worn without trouble also with respect to the thin oxygenator main body 22B.

  The thickness of the artificial lung body is not limited to two types. In other words, if the number of engagement holes provided in the second frame is three or more, it can be easily adapted to various types of artificial lung main bodies.

  Next, details of the structures of the engaging claws 27 of the first frame body 24 and the engaging holes 29 and 30 of the second frame body 25 will be described with reference to FIGS. 11 and 12. FIG. 11B is an enlarged view of the characteristic portion of the engaging claw 27 in the range surrounded by the circle A in the first frame body 24 shown in FIG. 12B is an enlarged view of the characteristic portion of the engagement hole 30 in a range surrounded by a circle B in FIG. Note that the characteristic portion of the engagement hole 29 is the same as that of the engagement hole 30.

  As shown in FIG. 11 (b), the engaging claw 27 forms, as a basic engaging portion, a longitudinal convex portion 27a that protrudes upward in the direction intersecting the surface of the engaging piece 26, that is, in the vertical direction. ing. Further, a lateral protrusion 27b that protrudes laterally from one side edge of the engagement piece 26 is also formed. In the figure, the lateral protrusion 27b protrudes outward.

  On the other hand, the inner edge 30 a in the horizontal direction shown in FIG. 12B constitutes a basic engaging portion of the engaging hole 30. The lateral inner end edge 30 a is a portion extending in the left-right direction among the inner peripheral edge (inner end edge) of the engagement hole 30. The engagement hole 30 is further formed with a vertical edge 30b extending in the vertical direction from one side of the horizontal inner edge 30a. When the engaging claw 27 and the engaging hole 30 are engaged, the lateral convex portion 27b is configured to abut on the longitudinal end edge 30b.

  As described above, the engagement claw 27 and the engagement hole 30 are combined with the contact between the horizontal protrusion 27b and the vertical end edge 30b simultaneously with the contact between the vertical protrusion 27a and the horizontal inner edge 30a. Engagement is formed. Therefore, in order to release the engagement between the engagement claw 27 and the engagement hole 30, the contact between the vertical convex portion 27a and the horizontal inner end edge 30 is removed in the vertical direction and the horizontal convex portion 27b is It is necessary to remove the contact of the direction edge 30b in the left-right direction.

  For example, in the case of the structure in which the engagement is formed only by the contact of the vertical convex portion 27a and the horizontal inner end edge 30a, the first frame body 24 and the second frame body 25 are relatively relative to each other in the vertical direction. When a displacing force is applied, there is a risk of disengagement easily. On the other hand, according to the above configuration, since the engagement is released only when the force is applied simultaneously in the vertical direction and the horizontal direction, the certainty that the engagement is maintained is high. This effect is particularly advantageous in combination with the structure for achieving the basic object of the present embodiment as described above.

  In other words, when the protective cover 23 is configured to be adaptable to two types of artificial lung bodies 22A and 22B having different thicknesses, the engaging claw for either the engaging hole 29 or the engaging hole 30 It is difficult to avoid the possibility that the engagement of 27 is slightly sweetened. On the other hand, the engagement claw 27 and the engagement holes 29 and 30 have the above-described engagement structure, so that the engagement can be reliably maintained in any case.

  However, the engagement structure as described above of the engagement claw 27 and the engagement holes 29 and 30 is not essential. That is, for example, if manufacturing accuracy is sufficiently managed, even if only one engagement structure, for example, only the contact between the vertical convex portion 27a and the horizontal inner edge 30a, is sufficient for practical use. You can get a good result.

  According to the protective cover for an artificial lung of the present invention, it can be easily adapted to a plurality of types of artificial lung bodies having different thicknesses, and is useful for an artificial lung used for extracorporeal blood circulation or the like.

DESCRIPTION OF SYMBOLS 1 Blood reservoir 2 Artificial lung 3 Connecting member 4 Main body part 5 Blood storage chamber 6 Blood outflow port 7 Support part 8,11 Connection part 8a Cylindrical outer peripheral surface 9 1st fitting part 9a Cylindrical inner peripheral surface 10 2nd fitting part 12 Holder 13 Locking lever 14 Heat exchange part 15 Gas exchange part 16, 17 Blood port 18, 19 Cold / hot water port 20, 21 Gas port 22 Artificial lung body 23 Protective cover 24 First frame 24a, 25a Circular hole 25 Second Frame body 26 Engagement piece 27 Engagement claw 27a Vertical projection 27b Lateral projection 28 Shoulder 29, 30 Engagement hole 30a Lateral inner edge 30b Vertical edge 31 Side wall 32 Adjustment side wall 33 Separation boundary

Claims (4)

A protective cover attached to cover at least a part of the oxygenator body in which a gas exchange chamber is formed;
With respect to the oxygenator main body, the first and second frames are disposed, one of which is disposed on the front surface side and the other on the rear surface side,
The first frame body has a pair of left and right engagement pieces extending toward the second frame body in the state of being attached to the oxygenator main body at the upper and lower end portions, respectively. There is a claw,
The second frame body has shoulder portions extending toward the first frame body in the mounted state on the oxygenator main body at the upper and lower end portions, respectively, and the shoulder portions correspond to the engaging claws. A pair of left and right engagement holes provided so that each of the engagement claws can be fitted,
Engagement hole of the second frame is viewed including the pair of left and right engagement holes plurality of rows of different distances from the first frame,
The second frame has adjustment side walls projecting toward the first frame on left and right side walls, and facilitates removal of the adjustment side wall at the boundary between the adjustment side wall and the side wall. A protective cover for an artificial lung, wherein a separation boundary is formed . The engaging claw forms a vertical convex portion that protrudes in a direction intersecting the surface of the engaging piece,
The engaging claw and the engaging hole are brought into contact by the vertical convex portion of the engaging claw coming into contact with a lateral inner end edge which is a portion extending in the left-right direction among the inner peripheral edge of the engaging hole. The artificial lung protective cover according to claim 1, wherein the protective cover is configured to engage with each other. The engaging claw includes a horizontal convex portion protruding from one of the side ends of the engaging piece in addition to the vertical convex portion,
A vertical edge extending in the vertical direction from one side of the lateral inner edge of the engagement hole is formed, and when the engagement claw and the engagement hole are engaged, the lateral side of the engagement claw The direction convex portion is configured to abut against the longitudinal edge,
In order to release the engagement between the engagement claw and the engagement hole, the contact between the vertical projection and the horizontal inner edge is removed in the vertical direction, and the horizontal projection and the vertical direction The artificial lung protective cover according to claim 2 , wherein it is necessary to remove the contact of the edge in the left-right direction.   The protective cover for an artificial lung according to claim 1, wherein the first or second frame body is provided with a coupling portion for connecting another medical device and the artificial lung.

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