JP5896225B2 - Artificial lung protective cover - Google Patents

Description

  The present invention relates to a protective cover that is attached to an oxygenator body of an oxygenator, and more particularly, to a protective cover that has a misfit prevention structure for avoiding being fitted to an oxygenator body in an incorrect posture.

  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

  Even if the first frame and the second frame are not brought into contact with the front and rear surfaces of the oxygenator body in the correct posture, the protective cover of the conventional example may be fitted and united. there were. That is, even when either the first frame body or the second frame body is turned upside down or both are turned upside down, both the frame bodies are fitted to each other. There is a possibility that erroneous fitting will occur that would cause the artificial lung body to be mounted in an inappropriate state.

  When such erroneous fitting occurs, for example, the centers of the openings provided in both frames are shifted from the blood ports for inflow and outflow to the blood flow path provided in the housing. There is a risk that it will be difficult to use an artificial lung. Alternatively, there is a possibility that the connection with the blood reservoir becomes difficult due to inappropriate arrangement of the connecting portion with the connecting member provided on the first frame.

  Therefore, an object of the present invention is to provide a protective cover having an erroneous fitting prevention structure for avoiding being fitted to an artificial lung body in an incorrect posture.

In order to solve the above-mentioned problems, an oxygenator protective cover according to the present invention is a protective cover that is mounted so as to cover at least a part of an oxygenator body in which a gas exchange chamber is formed. A first and second frame body, one of which is disposed on the front surface side and the other on the rear surface side with respect to the main body, the first frame body being attached to the oxygenator main body at the upper and lower end portions, respectively. A pair of left and right fitting pieces extending toward the second frame body in the state, and an engagement claw is provided at a tip of an engagement portion formed by a part of the fitting piece, Each of the upper and lower ends has a shoulder, and the shoulder is provided with a pair of left and right fitting holes into which the fitting pieces of the first frame body are fitted, Engagement holes that can be engaged with each of the engagement claws are provided at positions corresponding to the engagement claws, between the outer edges of the fitting pieces. Or at least one of the inner edge of the interval, depends between said lower portion and said upper portion, said fitting pieces, fitting regulating portion is provided with the engaging portion, fitting the said engagement portion The combination restricting portions are arranged side by side, and a slit is formed between the two portions to be separated from each other .

  According to the above configuration, when one of the first and second frame bodies is turned upside down with respect to the other, the fitting becomes impossible. Accordingly, it is possible to restrict the first frame body and the second frame body from being mounted facing each other.

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. The perspective view which shows the form seen from the back side of the oxygenator main body The perspective view seen from the back side of the 1st frame of a protection cover Top view of the first frame Bottom view of the first frame Front view showing the second frame of the protective cover The front view which expands the upper end part and the lower end part of the 2nd frame, and shows a dimensional relationship

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

  That is, both the outer edge interval and the inner edge interval of the fitting piece may be different between the upper end portion and the lower end portion.

  The fitting piece is provided with a fitting restricting portion together with the engaging portion, the engaging portion and the fitting restricting portion are arranged side by side, and a slit is formed between the two portions. It can be set as the structure isolate | separated from each other.

  In addition, an outer surface regulating portion formed of one of a concave portion or a convex portion is provided in a part of an outer surface region where the first and second frame bodies face each other in the artificial lung body, and the first and second frame bodies An inner surface restricting portion composed of the other of the concave portion or the convex portion is provided at a location corresponding to the outer surface restricting portion, and the convex portion becomes the artificial lung by fitting the outer surface restricting portion and the inner surface restricting portion to each other. A position that is configured not to obstruct the mounting of the first and second frames to the main body, and the positions of the outer surface restricting portion and the inner surface restricting portion deviate from an intermediate position in the vertical direction of the oxygenator main body. It can be set as the structure set to.

  Further, the first or second frame may be provided with a coupling portion for coupling 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. Only the oxygenator main body 22 from which the protective cover 23 has been removed from FIG. 5 is shown in FIG. 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.

  A pair of left and right upper fitting pieces 26 and 27 extending toward the second frame 25 are provided at the upper end of the first frame 24. The upper fitting pieces 26 and 27 have engaging portions 26a and 27a located on the outer side and fitting restricting portions 26b and 27b located on the inner side, respectively. Engagement claws 28 projecting in a substantially vertical direction are formed at the tips of the engagement portions 26a and 27a. A similar pair of left and right lower fitting pieces is also provided at the lower end of the first frame 24.

  The upper and lower end portions of the second frame body 25 are each provided with shoulder portions 29 extending toward the first frame body 24, and two pairs of left and right engagement holes 30, 31 are formed. When the first and second frame bodies 24 and 25 are attached to the oxygenator main body 22, the engaging claws 28 engage with the engaging holes 30 or 31. 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 is configured to be attachable to two types of oxygenator bodies 22 having different thicknesses of the gas exchange unit 15. That is, the engagement holes 30 and 31 of the shoulder portion 29 of the second frame 25 are respectively arranged corresponding to the engagement claws 28, and each of the engagement claws 28 can be engaged. The pair of left and right engagement holes 30 in the first row are arranged at positions where the distance from the first frame body 24 is short, and the pair of left and right engagement holes 31 in the second row is more than the engagement holes 30 in the first row. Is also arranged at a position far from the first frame body 24.

  The engaging claws 28 of the first frame body 24 can selectively engage with the engaging holes 30 in the first row or the engaging holes 31 in the second row. Thereby, the space | interval of the 1st frame 24 and the 2nd frame 25 can be adjusted, and it can adapt to the thickness of the oxygenator main body 22. FIG.

  Further, left and right side wall portions 32 of the second frame body 25 are provided with adjustment side walls 33 projecting toward the first frame body 24. A separation boundary 34 is formed at the boundary between the adjustment sidewall 33 and the sidewall 32. The separation boundary portion 34 is formed of, for example, a shallow groove, and the adjustment side wall 33 can be easily broken off at this portion. Therefore, the interval between the side regions of the first frame body 24 and the second frame body 25 can be adjusted depending on the presence / absence of the adjustment side wall 33, which is more appropriate for the two types of artificial lung main bodies 22 having different thicknesses. Can be adapted.

  Next, a structure for preventing erroneous fitting of the protective cover 23 to the oxygenator body 22 will be described with reference to FIGS. FIG. 7 is a perspective view of the first frame body 24 as viewed from the back side (side contacting the artificial lung body 22). Similar to the pair of left and right upper fitting pieces 26 and 27 described above, lower fitting pieces 35 and 36 are provided at the lower end portion.

  The lower fitting pieces 35 and 36 also have outer engaging portions 35a and 36a and inner fitting restricting portions 35b and 36b, respectively. Engaging claws 37 projecting in a substantially vertical direction are formed at the tips of the engaging portions 35a and 36a. In the figure, the engaging claws 28 of the upper end engaging portions 26a, 27a protrude upward, and the engaging claws 37 of the lower end engaging portions 35a, 36a protrude downward.

  FIG. 8A is a top view of the first frame body 24, and FIG. 8B is a bottom view of the first frame body 24. As shown in FIG. 8A, the distance between the outer edges of the upper fitting pieces 26, 27 (the outer edges of the engaging portions 26a, 27a) is the distance between the inner edges of the Wt1 (the inner edges of the fitting restricting portions 26b, 27b). Is denoted as Wt2. Further, as shown in FIG. 8B, the interval between the outer edges of the lower fitting pieces 35, 36 (the outer edges of the engaging portions 35a, 36a) is Wu1, and the inner edge (the inner edges of the fitting restricting portions 35b, 36b). The interval is denoted as Wu2. 8A and 8B, the engaging portions 26a, 27a, 35a, 36a and the fitting restricting portions 26b, 27b, 35b, 36b are separated by slits 38, 39, respectively.

  FIG. 9 is a front view showing the second frame 25, that is, a view seen from the side in contact with the oxygenator body 22. Upper fitting holes 40 and 41 are provided at the upper end, and lower fitting holes 42 and 43 are provided at the lower end. The upper fitting holes 40 and 41 are respectively fitted with the upper fitting pieces 26 and 27 of the first frame 24, and the lower fitting holes 42 and 43 are fitted with the lower fitting pieces 35 and 36, respectively. To do.

  An enlarged view of the region Y1 including the upper fitting holes 40 and 41 is shown in FIG. 10A, and an enlarged view of the region Y2 including the lower fitting holes 42 and 43 is shown in FIG. The upper fitting holes 40 and 41 have engaging portions 40a and 41a and fitting restricting portions 40b and 41b, respectively. The lower fitting holes 42 and 43 have engaging portions 42a and 43a and fitting restricting portions 42b and 43b, respectively.

  The engaging portions 40a to 43a are engaged with the engaging portions 26a, 27a, 35a, 36a of the first frame 24, and the engaging claws 28, 37 are engaged with the engaging holes 30 or 31 (FIG. 5). Engage. Further, the fitting restricting portions 26b, 27b, 35b, and 36b of the first frame 24 are fitted into the fitting restricting portions 40b to 43b, respectively. The interval between the inner edges of the fitting pieces (fitting holes) can be adjusted by the fitting restricting portion without affecting the action of the engaging portion.

  As shown in FIG. 10, the interval between the outer edges of the upper fitting holes 40, 41 (the outer edges of the engaging portions 40a, 41a) is Wt1, and the interval between the inner edges (the inner edges of the fitting restricting portions 40b, 41b) is Wt2 is set. Further, the interval between the outer edges of the lower fitting holes 42 and 43 (the outer edges of the engaging portions 42a and 43a) is set to Wu1, and the interval between the inner edges (the inner edges of the fitting restricting portions 42b and 43b) is set to Wu2. Yes.

  Conventionally, the relationship between the outer edge interval Wt1 and the inner edge interval Wt2 of the upper fitting pieces 26 and 27, and the outer edge interval Wu1 and the inner edge interval Wu2 of the lower fitting pieces 35 and 36 is Wt1 = Wu1. And Wt2 = Wu2. This relationship is naturally the same for the dimensions of the upper fitting holes 40 and 41 and the lower fitting holes 42 and 43.

  The relationship between the combination of the postures (up and down directions) of the first frame body 24 and the second frame body 25 and the fitting state in this case is shown in (Table 1). In (Table 1), when the posture is “positive”, the upper and lower sides of the frame body are correctly oriented. In the case of “wrong”, the upper and lower sides of the frame are reversed. In all cases where the postures of the first frame body 24 and the second frame body 25 are combined as in fitting A1 to fitting D1, fitting is possible, but in the case of fitting B1 to fitting D1. Improper mating. That is, the fitting is in a functionally inappropriate state.

  On the other hand, the dimension change of a fitting piece which is a 1st countermeasure for ensuring a suitable fitting state is demonstrated. That is, the interval Wt1 between the outer edges of the upper fitting pieces 26 and 27 and the interval Wu1 between the outer edges of the lower fitting pieces 35 and 36 are made different (Wt1 ≠ Wu1). Alternatively, the inner edge intervals Wt2 and Wu2 are made different (Wt2 ≠ Wu2). Either one or both may be different. Thereby, the relationship between the combination of the postures (up and down directions) of the first frame body 24 and the second frame body 25 and the fitting state is as shown in (Table 2).

  That is, when one of the first frame body 24 and the second frame body 25 is turned upside down with respect to the other, the fitting becomes impossible (fitting B2, C2). However, as long as the first frame body 24 and the second frame body 25 face each other vertically, they can be fitted to the oxygenator main body 22 even if they are turned upside down (fitting D2). If the usage state allows such a fitting state, only this countermeasure may be used.

  The effect of preventing erroneous fitting due to upside down is sufficiently increased as the widths of the upper fitting pieces 26 and 27 and the lower fitting pieces 35 and 36 are increased. On the other hand, since the respective fitting pieces are separated by the slits 38 and 39, the engaging portions 26a, 27a, 35a, and 36a are movable by the flexibility even if the width of the fitting pieces is increased. Can be secured sufficiently.

  In addition, if the state of the fitting D2 is not acceptable, further measures are necessary so as to achieve an appropriate fitting. The 2nd countermeasure which is the example is demonstrated below.

  The second countermeasure is rib addition. That is, as shown in FIG. 9, protruding ribs 44 are provided at locations where the second frame body 25 comes into contact with the oxygenator body 22. Further, as shown in FIG. 6, a recess 45 is provided at a location corresponding to the rib 44 in the oxygenator main body 22. The rib 44 and the recess 45 are fitted to each other so that the rib 44 does not become an obstacle to the attachment of the first and second frame bodies 24 and 25 to the oxygenator body 22. The positions of the ribs 44 and the recesses 45 are set at positions deviating from the intermediate position in the vertical direction of the oxygenator main body 22.

  As described above, as a second countermeasure, a part of the outer surface area of the oxygenator main body 22 (in a range where the first and second frame bodies 24 and 25 face each other) is formed from one of the concave portion or the convex portion (rib). An outer surface restricting portion is provided, and an inner surface restricting portion formed of the other of the concave portion or the convex portion (rib) is provided at a location corresponding to the outer surface restricting portion in the first and second frame bodies 24 and 25. The positions of the outer surface restricting portion and the inner surface restricting portion are set to positions deviated from the intermediate position in the vertical direction of the oxygenator main body 22.

  If the first and second frame bodies 24 and 25 are turned upside down with respect to the artificial lung body 22 due to the second countermeasure, they cannot be combined. When only the second countermeasure (addition of the rib 44 and the recess 45) is performed, the relationship between the combination of the postures (vertical directions) of the first frame body 24 and the second frame body 25 and the fitting state is ( As shown in Table 3). That is, when the second frame 25 is turned upside down with respect to the oxygenator main body 22, the fitting is impossible (fitting B3, D3). However, when the second frame 25 is facing the artificial lung body 22, the second frame 25 can be fitted even if the first frame 24 is inverted (fitting C3, improper fitting).

  Preferably, the measures by changing the size of the fitting piece and adding a rib are combined. As a result, as shown in (Table 4), the artificial lung body 22 can be fitted only when the first and second frame bodies 24, 25 are both faced up and down (fitting A4), Inappropriate wearing can be reliably avoided.

  In the description of the above embodiment, the first frame 24 is disposed on the front surface side of the oxygenator body 22 and the second frame 25 is disposed on the rear surface side. The reverse arrangement may be used.

  According to the protective cover for an artificial lung of the present invention, it is possible to avoid fitting with an artificial lung body in an incorrect posture, and it 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 Frames 26, 27 Upper fitting pieces 35, 36 Lower fitting pieces 26a, 27a, 35a, 36a Engaging portions 26b, 27b, 35b, 36b Fitting restricting portions 28, 37 Engaging claws 29 Shoulder portions 30, 31 Joint hole 32 Side wall part 33 Adjustment side wall 34 Separation boundary part 40, 41 Upper fitting hole 42, 43 Lower fitting hole 40a-43a Engagement part 40b-43b Fitting regulation part 44 Rib 45 Recessed part

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 frame bodies, one of which is disposed on the front side and the other on the rear side,
Each of the first frame bodies has a pair of left and right fitting pieces extending toward the second frame body in an attached state to the oxygenator main body at upper and lower ends, and a part of the fitting pieces is formed. An engaging claw is provided at the tip of the engaging portion to be
The second frame body has shoulder portions on each of upper and lower ends, and the shoulder portion is provided with a pair of left and right fitting holes into which the fitting pieces of the first frame body are fitted, In the fitting hole, a position corresponding to the engagement claw is provided with an engagement hole in which each of the engagement claws can be engaged,
At least one spacing interval or the inner edge of the outer edge of the fitting piece, unlike between said lower portion and said upper portion,
The fitting piece is provided with a fitting restricting portion together with the engaging portion, the engaging portion and the fitting restricting portion are arranged side by side, and a slit is formed between the two portions. A protective cover for an artificial lung, which is separated . 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 frame bodies, one of which is disposed on the front side and the other on the rear side,
Each of the first frame bodies has a pair of left and right fitting pieces extending toward the second frame body in an attached state to the oxygenator main body at upper and lower ends, and a part of the fitting pieces is formed. An engaging claw is provided at the tip of the engaging portion to be
The second frame body has shoulder portions on each of upper and lower ends, and the shoulder portion is provided with a pair of left and right fitting holes into which the fitting pieces of the first frame body are fitted, In the fitting hole, a position corresponding to the engagement claw is provided with an engagement hole in which each of the engagement claws can be engaged,
At least one of the interval between the outer edges or the inner edges of the fitting pieces is different between the upper end portion and the lower end portion,
In the part of the outer surface area where the first and second frame bodies are opposed to each other in the oxygenator main body, an outer surface restricting portion including one of a concave portion or a convex portion is provided,
In the first and second frame bodies corresponding to the outer surface restricting portion, an inner surface restricting portion made of the other of the concave portion or the convex portion is provided,
The outer surface restricting portion and the inner surface restricting portion are fitted to each other so that the convex portion is configured not to be an obstacle to the attachment of the first and second frame bodies to the artificial lung main body, and position of the outer surface regulating portion and the inner surface regulating portion, the protective cover of the oxygenator, characterized in that it is set to a position deviated from the vertical middle position of the oxygenator body. The protective cover for an artificial lung according to claim 1 or 2 , wherein both an outer edge interval and an inner edge interval of the fitting piece are different between the upper end portion and the lower end portion. The protective cover for an artificial lung according to claim 1 or 2, wherein the first or second frame body is provided with a connecting portion for connecting another medical device and the artificial lung.

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