JP2015073589A - Connection structure of medical device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently ensure a connection holding force and require no strong force or special skill in operation of releasing a connection.SOLUTION: An artificial lung 2 is supported by a blood storage tank 1 through a connection member 20. A fitting inner cylinder part of the artificial lung fits within a second fitting part 23 of the connection member and has a plurality of slide projections 12. The connection member comprises engaging grooves 8, 24 corresponding to the slide projections and a lock member 25. The engaging grooves include a vertical groove in a shaft direction of the second fitting part and a lateral groove in a circumferential direction. With a relative displacement of the second fitting part and fitting inner cylinder part, the slide projections enter the vertical groove from a lower end and slide in the lateral groove. The lock member includes a catch protruding inward at a lower portion of a fulcrum and an operation lever part extending upward from the fulcrum. The catch engages with the slide projections at a prescribed position of the lateral groove and prevents a rotation displacement to a start edge side of the lateral groove. By pressing and rotating the operation lever part, the catch displaces to a radial direction, and an engagement with the slide projections is released.

Description

  The present invention relates to a connecting structure for supporting a second medical device by a first medical device via a connecting device, for example, a connecting structure for supporting an artificial lung by a blood reservoir. In particular, the present invention relates to an improvement in a detachable structure for coupling a connecting device to a second medical device.

  For example, in cardiac surgery, a cardiopulmonary apparatus is used to stop the patient's heart and perform breathing 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.

  Further, in extracorporeal blood circulation, the blood pump is operated to remove blood from the patient's vein, and after exchanging gas between the oxygen-containing gas and the blood by an artificial lung, the operation of returning to the patient's artery is performed. Therefore, a blood circuit for performing extracorporeal blood circulation needs to have a buffer function for adjusting the blood volume in the circuit and keeping the blood return 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.

  Thus, in a blood circuit for extracorporeal blood circulation, a blood reservoir is generally used together with an artificial lung. In the following description, an apparatus including an artificial lung and a blood reservoir used in an extracorporeal blood circulation circuit is referred to as an extracorporeal circulation processing apparatus. In addition, the artificial lung is generally configured such that a gas exchanging part for exchanging gas is integrated with a heat exchanger for adjusting the temperature of blood, but the heat exchanger is integrated. That is not essential. The following description is also applied in common to the case of an artificial lung having only a gas exchange unit without a heat exchanger.

  Regarding the extracorporeal circulation processing device, it is desirable to shorten the distance between the artificial lung and the blood reservoir in order to reduce the arrangement space of each device and reduce the blood filling amount in the blood circuit formed by the connection tube. . In addition, in consideration of the ease of assembling the extracorporeal blood circulation circuit, the blood reservoir and the artificial lung are generally used as an extracorporeal circulation processing apparatus in an integrated state. As a form of integration, a connection structure in which an artificial lung is supported under the bottom of the blood reservoir is usually employed (see, for example, Patent Document 1).

  The structure of the extracorporeal circulation processing apparatus disclosed in Patent Document 1 in which a blood reservoir and an artificial lung are integrated will be described with reference to a side view shown in FIG. This extracorporeal circulation processing apparatus is configured by connecting an artificial lung 2 below the bottom surface of a blood reservoir 1. However, FIG. 8 shows a state immediately before the connection. The blood reservoir 1 includes a main body portion 3 and a lid body 4 placed on the upper portion of the main body portion 3.

  The main body 3 has a blood storage chamber 5 that is formed so that a part of the main body 3 protrudes downward from the center of the bottom surface, and a blood outflow port 6 is provided at the lower end of the blood storage chamber 5. A cylindrical coupling portion (not shown) protruding downward is provided at a position separated from the blood storage chamber 5 on the bottom surface of the main body portion 3. A cylindrical connecting member 7 is rotatably attached to the cylindrical coupling portion via an O-ring (not shown) and protrudes downward. The connecting member 7 has an engaging groove 8 for coupling with the oxygenator 2 at the lower part thereof. Various types of port groups 9 are provided on the lid 4, and include an intracardiac blood inlet port, a venous blood inlet port, a drug solution injection port, an exhaust port for adjusting the pressure in the blood reservoir 1, and the like.

  The oxygenator 2 has a structure in which a protective cover 10 is attached to the oxygenator body. The protective cover 10 includes a heat exchange side frame 10a that covers the heat exchange part side of the oxygenator body and a gas exchange side frame 10b that covers the gas exchange part side. A cylindrical fitting inner cylinder portion 11 is provided on the upper portion of the heat exchange side frame 10a. The fitting inner cylinder portion 11 can be fitted inside the connecting member 7. A sliding projection 12 protruding in the radial direction is provided on the outer peripheral surface of the fitting inner cylinder portion 11, and engages with the engaging groove 8 of the connecting member 7.

  The oxygenator main body has a blood flow path that penetrates the heat exchange section and the gas exchange section in the horizontal direction. Blood ports 13 and 14 are provided at positions corresponding to both ends of the blood flow path in the oxygenator body. Cold / hot water ports 15 and 16 are provided in the heat exchange unit, and gas ports 17 and 18 are provided in the upper and lower ends of the gas exchange unit.

  The coupling structure of the connecting member 7 and the fitting inner cylinder part 11 is shown in a simplified manner in FIGS. 9A and 9B. 9A is a side view, and FIG. 9B is a plan sectional view. 9A and 9B show a state where the connecting member 7 and the fitting inner cylinder portion 11 are fitted, and the engagement of the sliding protrusion 12 with the engaging groove 8 is completed.

  As shown in FIG. 9B, the sliding protrusions 12 are provided at four intervals in the circumferential direction at intervals of 90 degrees. The engaging grooves 8 are provided corresponding to the four sliding protrusions 12. The engagement groove 8 is L-shaped as shown in FIG. 9A. That is, the engagement groove 8 is constituted by a vertical groove 8a formed along the axial direction from the lower end of the connecting member 7, and a horizontal groove 8b formed along the circumferential direction from the end of the vertical groove 8a. . The horizontal groove 8b is provided with a holding projection 19 that narrows the width of the horizontal groove 8b in the vertical direction. As a result, it is possible to obtain a drop-off preventing function for holding the sliding protrusion 12 so as not to be easily detached from the lateral groove 8b.

  When connecting the connecting member 7 and the fitting inner cylinder part 11, the fitting inner cylinder part 11 is fitted in the internal space of the connecting member 7 and the sliding protrusion 12 is engaged with the engaging groove 8. Let Therefore, first, the connecting member 7 and the fitting inner cylinder portion 11 are aligned so that the sliding projection 12 fits in the vertical groove 8a, and the sliding projection 12 is moved upward until it reaches the upper end of the vertical groove 8a. Let Further, the coupling member 7 and the fitting inner cylinder portion 11 are rotated relative to each other, and the engagement is completed by feeding the sliding protrusion 12 to the back of the lateral groove 8b.

  In the process, the sliding protrusion 12 gets over the holding protrusion 19 to obtain a holding state of engagement. Thereby, the artificial lung 2 is fixed to the blood reservoir 1. After use, the artificial lung 2 can be removed from the blood reservoir 1 by performing a reverse rotation operation.

JP 2010-284201 A

  For the coupling structure of the connecting member 7 and the fitting inner cylinder portion 11 as described above, it is desired that the following conditions are satisfied with respect to safety and operability.

[Requirements for safety and operability]
1) Even when an unintended load assumed for clinical use is applied, the occlusion of the oxygenator 2 can be avoided.
2) Does not give anxiety that the oxygenator 2 may fall off during blood circuit setting or during extracorporeal circulation.
3) When removing the oxygenator 2 from the blood reservoir 1, the risk of dropping it on the floor is reduced.
4) Excellent layout with the blood reservoir 1 and the pump, and does not waste the circuit filling amount.
5) No force or procedure is required for the operation of removing the oxygenator 2 from the blood reservoir 1.

  In order to satisfy the safety conditions 1) to 3) among these conditions, it has been considered to sufficiently increase the protruding amount of the holding protrusion 19. As a result, the resistance of the holding projection 19 to prevent the sliding projection 12 from rotating is increased, the holding force against removal is increased, and the drop-off preventing function is enhanced. However, if the holding force is increased to make it difficult to come off, the force required for the coupling or releasing operation increases, which hinders the ease of operation, and is therefore inconvenient with respect to the operability condition 5). That is, the connection structure of the conventional example has excessively enhanced safety, so that consideration for operability is not sufficient.

  In order to alleviate the force required for operation while maintaining a sufficient drop-off prevention function, the following configuration has been considered. That is, as shown in FIG. 10, the width w of the lateral groove 8 c is made larger than the diameter of the sliding protrusion 12. Thereby, even if the protrusion amount of the holding protrusion 19 is large, the force for the sliding protrusion 12 to get over the holding protrusion 19 is reduced. In addition, a spring is provided in the connecting member 7 to apply a biasing force in a direction away from the connecting member 7 to the fitting inner cylinder portion 11. Thereby, in the coupling state of the connecting member 7 and the fitting inner cylinder part 11, the sliding protrusion 12 is pressed against the lower edge of the lateral groove 8b. For this reason, it is difficult to get the holding projection 19 over the sliding projection 12 by simply rotating the connecting member 7 and the fitting inner cylinder portion 11 with each other, and the holding of the engagement is ensured.

  When releasing the connection, the fitting inner cylinder portion 11, that is, the artificial lung 2 is pressed toward the connection member 7. As a result, the sliding protrusion 12 is pressed toward the upper edge of the lateral groove 8b, and the sliding protrusion 12 is released from the holding protrusion 19. At the same time, an operation for rotating the oxygenator 2 with respect to the connecting member 7 is performed. Thereby, the force required for the operation of moving the sliding protrusion 12 along the horizontal groove 8b toward the vertical groove 8a is reduced.

  If it does as mentioned above, operativity can be improved, maintaining the safety | security of the connection structure of the connection member 7 and the fitting inner cylinder part 11. FIG. However, even if the above configuration is adopted, the condition 5) cannot be sufficiently satisfied.

  This is because, when releasing the connection, there are two types of operations: a longitudinal operation in which the oxygenator 2 is pressed toward the connecting member 7, and a rotating operation in which the oxygenator 2 is rotated with respect to the connecting member 7. This is because it is necessary to perform the above simultaneously. In addition, since a spring that urges the fitting inner cylinder portion 11 is sufficiently strong to satisfy the conditions 1) to 3), a considerable force is applied to the longitudinal operation performed against the spring. If it is necessary and if it is attempted to rotate at the same time, a considerable procedure is required.

  The connection structure as described above is not limited to a combination of an oxygenator and a blood reservoir, and may be generally required when two types of medical devices are used in combination. For this reason, the above-described problems in the connection structure can also occur in a combination of general medical devices.

  Accordingly, an object of the present invention is to provide a medical device connection structure that has a sufficiently high holding force for connecting two types of medical devices and that does not require a strong force or a special procedure for releasing the connection. .

  Another object of the present invention is to provide an extracorporeal circulation processing apparatus using such a connection structure.

  The medical device connection structure of the present invention includes a connection member having a first fitting portion on the upper end side coupled to the first medical device and a cylindrical second fitting portion on the lower end side coupled to the second medical device. And the second medical device is supported by the first medical device. The second medical device includes a fitting inner cylinder part that fits into the second fitting part, and the fitting inner cylinder part has a plurality of sliding protrusions protruding in a radial direction. The connecting member includes an engaging groove provided at a position corresponding to the sliding protrusion of the second fitting portion, and a lock member supported via a fulcrum. The engagement groove includes a vertical groove extending in the axial direction from a lower end of the second fitting portion, and a horizontal groove extending in the circumferential direction starting from an inner end portion of the vertical groove. With the relative axial displacement and rotational displacement of the second fitting portion and the fitting inner cylinder portion, the sliding protrusion enters the vertical groove from the open lower end and slides in the horizontal groove.

  In order to solve the above-described problem, in the medical device connection structure of the present invention, the lock member includes an engaging claw that protrudes inwardly at a lower portion of the fulcrum, and an operation lever portion that extends upward from the fulcrum. The locking claw engages with the sliding projection at a predetermined position in the lateral groove to prevent rotational displacement of the sliding projection toward the start end side of the lateral groove, and By pressing toward the fitting inner cylinder portion, the locking claw is displaced in the radial direction of the second fitting portion by the rotation around the fulcrum due to elastic deformation, and the sliding projection and The engagement is released.

  According to the connection structure of the medical device having the above-described configuration, when releasing the coupling between the second fitting portion and the fitting inner cylinder portion, the operation of pressing the operation lever portion and the operation of rotating the artificial lung are performed simultaneously. Do. For this purpose, the connecting member may be gripped while pressing the operation lever portion with one palm, and the artificial lung may be rotated with the other hand. At this time, the engagement between the locking claw and the sliding projection is released, and the artificial lung can be rotated with a light force. In addition, since the hand for rotating the artificial lung only needs to perform an operation in one kind of direction, no special procedure is required, and the operability when releasing the connection is greatly improved.

The front view which shows the extracorporeal circulation processing apparatus containing the connection structure of the medical device in embodiment of this invention Side view of extracorporeal circulation processing device Front view of the connecting member that connects the blood reservoir and oxygenator of the extracorporeal circulation processing device Top view of the connecting member Side view of the connecting member The figure which looked at the direction of arrow A in FIG. 2C of the connection member Side view showing a blood reservoir as a first medical device of the extracorporeal circulation processing apparatus Side view showing oxygenator as second medical device of extracorporeal circulation processing device Top view of the oxygenator Side view showing a state in which the connecting member and the artificial lung face each other Side view showing the joint between the connecting member and the artificial lung The front view which shows the shape of the latching claw 28 provided in the connection member Side view showing the shape of the locking claw 28 Plan sectional drawing which followed the BB line of Drawing 6A The enlarged front view which shows the shape of the holding | maintenance protrusion 19 provided in the connection member Side view showing an extracorporeal circulation processing apparatus including a conventional medical device connection structure Side view showing the main part of the connection structure Plan sectional drawing which shows the principal part of the connection structure The side view which shows the part of the connection structure which is an improvement example of the connection structure of FIG. 9A

  The medical device connection structure of the present invention can take the following aspects based on the above-described configuration.

  That is, the engaging claw has a configuration in which an end portion on a side to be in contact with when the sliding protrusion starts to engage forms an inclined surface inclined inward from an end edge in the direction of the lateral groove. can do. At the time of engagement, the engaging claw can smoothly get over the sliding projection by the guide of the inclined surface with respect to the sliding projection, so that the connecting member and the artificial lung can be easily mounted when coupled.

  The width of the transverse groove with respect to the circumferential direction of the second fitting portion is larger than the diameter of the sliding protrusion, and the lower edge of the transverse groove protrudes toward the upper edge and is widened to the transverse groove. A holding projection that forms a narrow portion is provided, and the connection member is separated from the connection member with respect to the fitting inner cylinder in a state where the second fitting part and the fitting inner cylinder are fitted. A spring that provides a biasing force in the direction may be provided, and the sliding protrusion may be pressed against the lower edge of the lateral groove. As described above, the sliding projection is pressed against the lower edge of the lateral groove, so that the coupling state of the second fitting portion and the fitting inner cylinder portion is stably maintained, and the unintentional dropping of the second medical device is prevented. Effect is obtained.

  In addition, the holding projection may be configured such that an end portion on a side in contact with the sliding projection starts to form an inclined surface that is inclined upward from the end edge in the direction of the lateral groove. it can. As a result, the sliding protrusion can be guided by the inclined surface and can smoothly get over the holding protrusion, and can be easily mounted when the connecting member and the artificial lung are combined.

  Further, the connecting member has a main body cylindrical portion, and the second fitting portion is provided at a lower end portion of the connecting member, and the second fitting portion is arranged with the lock member with respect to a central axis of the main body cylindrical portion. It can be set as the structure biased to the done side. Thereby, the distance of the lock member from the outer peripheral surface of the main body cylindrical portion is increased, and the operation of the operation lever portion when releasing the coupling is facilitated.

  Further, the connecting member has a main body cylindrical portion, the second fitting portion is provided at a lower end portion thereof, and a central axis of the second fitting portion is locked with respect to a central axis of the main body cylindrical portion. It can be set as the structure which inclines in the direction in which a member falls. Thereby, the distance of the lock member from the outer peripheral surface of the main body cylindrical portion can be further increased, and the ease of operation can be improved.

  The first medical device has a coupling portion having a cylindrical shape, the first fitting portion is fitted with the coupling portion of the first medical device via an O-ring, and the connecting member is It can be set as the structure which can be rotated with respect to a 1st medical device. Thus, the degree of freedom of arrangement of the second medical device with respect to the first medical device is improved by enabling the connecting member to rotate with respect to the first medical device. However, when the second medical device is rotated, it is necessary to fix the connecting member so as not to rotate. On the other hand, according to this configuration, the operation of holding the connecting member while pressing the operating lever portion with one hand can also be performed at the same time to fix the connecting member, which is reasonable.

  The extracorporeal circulation processing apparatus of the present invention can be configured as follows using the connection structure having the above configuration. In other words, a part of the main body part that deviates from the center of the bottom surface has a blood storage chamber protruding downward, a blood outflow port is provided at the lower end of the blood storage room, and a blood inflow port is provided at the upper part of the main body part A medical device connection structure having any one of the above configurations, comprising a blood reservoir, a blood flow path for performing gas exchange by crossing the gas flow path with blood, and an oxygenator connected to the blood reservoir The artificial lung is supported by the blood reservoir via the connecting member, the blood reservoir being the first medical device as the first medical device, and the artificial lung is the second medical device. A connecting portion that protrudes downward at a position separated from the blood storage chamber and is connected to the first fitting portion of the connecting member, and the fitting inner cylinder portion is provided on an upper portion of the artificial lung. .

  Embodiments of the present invention will be described below with reference to the drawings. In the embodiment described below, a connection structure for connecting a blood reservoir (first medical device) and an artificial lung (second medical device) is disclosed using an extracorporeal circulation processing device as an example. This connection structure is not limited to application to a combination of a blood reservoir and an artificial lung, and can be applied to connection of various first medical devices and second medical devices.

<Embodiment>
FIG. 1A is a front view showing an extracorporeal circulation processing apparatus according to an embodiment of the present invention, and FIG. 1B is a side view. In this extracorporeal circulation processing apparatus, the configuration of the blood reservoir 1 and the artificial lung 2 is the same as that of the conventional example shown in FIG. Accordingly, the same reference numerals are assigned to the same elements, and the description is not repeated. In the present embodiment, the connecting member 20 has a configuration different from that of the connecting member 7 shown in FIG.

  The connecting member 20 of the present embodiment has a main feature in a configuration that provides a drop-off prevention function, that is, a configuration that maintains the connection with the oxygenator 2. Along with the change in configuration associated with this feature, as shown in FIG. 1A, the artificial lung 2 is supported in an inclined manner so that the heat exchange side frame 10a faces obliquely downward.

  A front view of the connecting member 20 is shown in FIG. 2A. 2B is a top view of the connecting member 20, FIG. 2C is a side view, and FIG. 2D is a view seen in the direction of arrow A in FIG. 2C. The blood reservoir 1 and the artificial lung 2 may have the same configuration as that of the conventional example, but for reference, the blood reservoir 1 that has been disconnected is shown in FIG. 3, and the artificial lung 2 is shown in FIGS. 4A and 4B. FIG. 5A is a side view showing the connecting member 20 and the artificial lung 2 facing each other. FIG. 5B shows a main part in a state where the connecting member 20 and the artificial lung 2 are coupled.

  As shown in FIGS. 2A to 2D, the connecting member 20 has a main body cylindrical portion 21, the upper end portion of which forms a first fitting portion 22, and the lower end portion is provided with a cylindrical second fitting portion 23. ing. The first fitting portion 22 is coupled to the blood reservoir 1, and the second fitting portion 23 is coupled to the oxygenator 2. As a result, the oxygenator 2 is supported by the blood reservoir 1 via the connecting member 20. The second fitting portion 23 is provided with engagement grooves 8 and 24 at four intervals in the circumferential direction at intervals of 90 degrees. That is, engagement grooves 8 similar to those of the conventional example are provided at three positions at intervals of 90 degrees, and lock portion engagement grooves 24 are provided at the remaining one position at intervals of 90 degrees. A lock member 25 is provided at a position corresponding to the lock portion engaging groove 24. The connecting member 20 can be made of polycarbonate, for example.

  As shown in FIG. 3, the blood reservoir 1 has a cylindrical coupling portion 26 that protrudes downward at a position separated from the blood reservoir 5 on the bottom surface of the main body portion 3, and has a first structure of the connecting member 20 by a well-known structure. It couple | bonds with the fitting part 22. FIG. That is, the coupling portion 26 is fitted inside the first fitting portion 22, and at this time, an O-ring is interposed between the outer peripheral surface of the coupling portion 26 and the inner peripheral surface of the first fitting portion 22. Thereby, the coupling portion 26 is securely held by the first fitting portion 22, and the connecting member 20 can be rotated with respect to the blood reservoir 1.

  As in the conventional example, the engaging groove 8 includes a vertical groove 8a formed along the axial direction from the lower end of the second fitting portion 23, and a horizontal groove 8b formed along the circumferential direction from the end of the vertical groove 8a. Consists of. A holding projection 19 is provided in the lateral groove 8b. The lock portion engaging groove 24 also includes a vertical groove 24a formed along the axial direction from the lower end of the second fitting portion 23, and a horizontal groove 24b formed along the circumferential direction from the end portion of the vertical groove 24a. . However, no holding projection is provided in the lateral groove 24b.

  The locking member 25 is supported by a fulcrum 27 provided on the second fitting portion 23, and is a locking claw disposed at the lower end of the fulcrum 27 in the vertical direction (the axial direction of the second fitting portion 23). 28 and an operation lever portion 29 extending above the fulcrum 27.

  The locking claw 28 is located facing the lateral groove 24b and protrudes inward (toward the radial center of the second fitting portion 23). In the free state (rest position) of the operation lever portion 29, the locking claw 28 is held in a state adjacent to the lateral groove 24b. By pressing the operating lever portion 29, the fulcrum 27 is elastically deformed, and accordingly, the lock member 25 is rotated around the fulcrum 27, and the locking claw 28 is moved outwardly in the radial direction of the second fitting portion 23. Displace in the direction.

  As shown in FIG. 2C, the second fitting portion 23 is biased toward the side where the lock member 25 is disposed with respect to the central axis of the main body cylindrical portion 21. Thereby, the distance of the lock member 25 from the outer peripheral surface of the main body cylindrical portion 21 is increased. Furthermore, the central axis of the second fitting portion 23 is inclined with respect to the central axis of the main body cylindrical portion 21 so that the lock member 25 is lowered.

  As shown in FIGS. 4A and 4B, a cylindrical fitting inner cylinder portion 11 is provided on the heat exchange side frame 10a of the oxygenator 2, and as shown in FIGS. It can be fitted inside the fitting part 23. Sliding projections 12 are provided on the outer peripheral surface of the fitting inner cylinder portion 11 at four positions in the circumferential direction at intervals of 90 degrees and project in the radial direction. By engaging the sliding protrusion 12 with the engaging grooves 8 and 24, the fitting between the fitting inner cylinder portion 11 and the second fitting portion 23 is maintained.

  When the second fitting part 23 and the fitting inner cylinder part 11 are coupled with each other by the above configuration, the fitting inner cylinder part 11 is axially connected to each other in the inner space of the second fitting part 23. And the sliding protrusion 12 is engaged with the engaging grooves 8 and 24 by applying a rotational displacement. That is, first, as compared with the state in FIG. 5A, the fitting inner cylinder portion 11 is rotated slightly to the right around the central axis, and is aligned so that the sliding protrusion 12 and the longitudinal grooves 8a and 24a face each other. . Then, the sliding protrusion 12 is inserted into the vertical grooves 8a and 24a from the open lower end, and is displaced in the axial direction until the upper end is reached. Further, the coupling member 20 and the fitting inner cylinder portion 11 are rotated relative to each other, and the engagement is completed by feeding the sliding protrusion 12 into the back of the lateral grooves 8b and 24b.

  As shown in FIG. 5B, in a state where the sliding protrusion 12 is positioned at the terminal end of the lateral groove 8b, the locking claw 28 engages with the sliding protrusion 12 in the lateral groove 24b. That is, when the sliding protrusion 12 is displaced toward the inner part in the lateral groove 24 b, the lock member 25 is rotated by elastic deformation of the fulcrum 27, and the locking claw 28 escapes from the sliding protrusion 12. After the sliding protrusion 12 passes, the locking claw 28 returns to the rest position. As a result, the locking claw 28 engages with the sliding projection 12, and the sliding projection 12 is prevented from being rotated and displaced toward the starting end of the lateral groove 24b, thereby providing a powerful drop-off preventing function.

  As shown in FIG. 2D, a leaf spring 30 is provided inside the second fitting portion 23. In a state where the second fitting portion 23 and the fitting inner cylinder portion 11 are fitted, a biasing force in a direction away from the connecting member 20 is given to the fitting inner cylinder portion 11 by the leaf spring 30. By this urging force, the sliding protrusion 12 is pressed against the lower edge of the lateral grooves 8b and 24b, and the coupling state of the second fitting portion 23 and the fitting inner cylinder portion 11 is stably maintained. As a result, an effect of preventing unintentional dropping of the artificial lung 2 is obtained. However, since the rotational displacement of the fitting inner cylinder portion 11 is prevented by the engagement of the locking claw 28 and the sliding projection 12, the urging force of the leaf spring 30 does not need to be increased.

  As shown in FIG. 6A to FIG. 6C, the locking claw 28 is inclined such that the end portion on the side in contact with the sliding protrusion 12 is inclined inward from the end edge in the direction of the lateral groove 8 b. A surface 31 is formed. 6A is a front view, FIG. 6B is a side view, and FIG. 6C is a plan sectional view taken along line BB in FIG. 6B. At the time of engagement, the locking claw 28 can smoothly get over the sliding projection 12 by the guide of the inclined surface 31 with respect to the sliding projection 12, so that the connecting member 20 and the artificial lung 2 can be easily attached when coupled.

  Further, as shown in FIG. 7, the holding projection 19 has an inclined surface 32 whose end on the side abutting when the sliding projection 12 begins to engage is inclined upward from the edge in the direction of the lateral groove 8b. Forming. As a result, the sliding protrusion 12 can be guided by the inclined surface 32 and can smoothly get over the holding protrusion 19, and can be easily mounted when the connecting member 20 and the oxygenator 2 are coupled.

  When the coupling of the connecting member 20 and the fitting inner cylinder part 11 is released, the locking claw 28 is engaged with the sliding protrusion 12 by pressing the operating lever part 29 toward the fitting inner cylinder part 11. Displaces in the direction in which is released. Thereby, fitting inner cylinder part 11 (artificial lung 2) can be rotated, and fitting of the 2nd fitting part 23 and fitting inner cylinder part 11 can be detached.

  As described above, when releasing, the operation of pressing the operation lever portion 29 and the operation of rotating the oxygenator 2 are performed simultaneously. For this purpose, the connecting member 20 may be grasped while pressing the operation lever portion 29 with one palm, and the artificial lung 2 may be rotated with the other hand. By these operations, the engagement between the locking claw 28 and the sliding projection 12 is released, and the urging force of the leaf spring 30 is small, so that the oxygenator 2 can be rotated with a light force. Further, the hand for rotating the artificial lung 2 need only perform an operation in one kind of direction, so that no special procedure is required.

  In addition, as above-mentioned, the connection part 26 of the blood reservoir 1 and the 1st fitting part 22 of the connection member 20 can be mutually rotated by interposing an O-ring. Therefore, when the artificial lung 2 is rotated, it is necessary to fix the connecting member 20 so as not to rotate. Therefore, two types of objects can be achieved simultaneously by the operation of grasping the connecting member 20 while pressing the operating lever portion 29 with one hand, which is reasonable.

  Further, as described above, the second fitting portion 23 is biased toward the side where the lock member 25 is disposed with respect to the central axis of the main body cylindrical portion 21, and the lock member 25 is separated from the outer peripheral surface of the main body cylindrical portion 21. Is getting bigger. Thereby, the movable range of the operation lever part 29 when releasing the coupling can be increased, and the operation becomes easy. Furthermore, since the central axis of the second fitting portion 23 is inclined with respect to the central axis of the main body cylindrical portion 21 as described above, the separation of the lock member 25 from the outer peripheral surface of the main body cylindrical portion 21 is further increased. It is possible to improve the ease of operation.

  According to the connection structure of the medical device of the present invention, the holding force of the connection is sufficiently high, and neither a strong force nor a special procedure is required for the operation for releasing the connection, which is useful for the configuration of an extracorporeal blood circulation circuit, for example. .

DESCRIPTION OF SYMBOLS 1 Blood storage tank 2 Artificial lung 3 Main-body part 4 Lid body 5 Blood storage chamber 6 Blood outflow port 7, 20 Connecting member 8 Engaging groove 9 Various port groups 10 Protective cover 10a Heat exchange side frame 10b Gas exchange side frame 11 Fitting Inner cylinder part 12 Sliding protrusions 13, 14 Blood ports 15, 16 Cold / hot water ports 17, 18 Gas ports 8a, 24a Vertical grooves 8b, 8c, 24b Horizontal grooves 19 Holding protrusions 21 Main body cylindrical part 22 First fitting part 23 Second Fitting portion 24 Lock portion engaging groove 25 Lock member 26 Coupling portion 27 Support point 28 Locking claw 29 Operation lever portion 30 Leaf springs 31, 32 Inclined surface

Claims (8)

The first medical device passes the connecting member having a first fitting portion on the upper end side coupled with the first medical device and a cylindrical second fitting portion on the lower end side coupled with the second medical device. A medical device coupling structure configured to support a second medical device, comprising:
The second medical device includes a fitting inner cylinder portion that fits into the second fitting portion, and the fitting inner cylinder portion includes a plurality of sliding protrusions protruding in a radial direction,
The connecting member includes an engaging groove provided at a position corresponding to the sliding protrusion of the second fitting portion, and a lock member supported via a fulcrum,
The engagement groove includes a vertical groove extending in an axial direction from a lower end of the second fitting portion, and a lateral groove extending in a circumferential direction starting from an inner end portion of the vertical groove, and the second fitting With the relative axial displacement and rotational displacement of the fitting part and the fitting inner cylinder part, the sliding projection enters the vertical groove from the open lower end and slides in the horizontal groove,
The locking member includes a locking claw protruding inward at a lower portion of the fulcrum, and an operation lever portion extending upward from the fulcrum,
The locking claw engages with the sliding protrusion at a predetermined position in the lateral groove, and prevents the sliding displacement of the sliding protrusion toward the start end side of the lateral groove,
By pressing the operation lever portion toward the fitting inner cylinder portion, the locking claw is displaced in the radial direction of the second fitting portion by rotation around the fulcrum accompanying elastic deformation, The medical device connection structure, wherein the engagement with the sliding protrusion is released.   2. The locking pawl has an inclined surface in which an end on a side in contact with the sliding projection starts to be inclined inward from an end edge in the direction of the lateral groove. The medical device connection structure described. The width of the lateral groove with respect to the circumferential direction of the second fitting portion is larger than the diameter of the sliding protrusion,
The lower edge of the lateral groove is provided with a holding projection that protrudes toward the upper edge and forms a narrow portion in the lateral groove,
The coupling member is provided with a spring that applies a biasing force in a direction away from the coupling member with respect to the fitting inner cylinder portion in a state where the second fitting portion and the fitting inner cylinder portion are fitted. The medical device connection structure according to claim 1, wherein the sliding protrusion is pressed against a lower edge of the lateral groove.   4. The holding projection according to claim 3, wherein an end of the holding projection that contacts when the sliding projection starts to engage forms an inclined surface that inclines upward from the end edge in the lateral groove direction. 5. Medical device connection structure. The connecting member has a main body cylindrical portion, and the second fitting portion is provided at a lower end portion thereof.
5. The medical device connection structure according to claim 1, wherein the second fitting portion is biased toward a side where the lock member is disposed with respect to a central axis of the main body cylindrical portion. The connecting member has a main body cylindrical portion, and the second fitting portion is provided at a lower end portion thereof.
The medical device connection structure according to any one of claims 1 to 5, wherein a central axis of the second fitting portion is inclined in a direction in which the locking member is lowered with respect to a central axis of the main body cylindrical portion. .   The first medical device has a coupling portion having a cylindrical shape, the first fitting portion is fitted with the coupling portion of the first medical device via an O-ring, and the connection member is the first medical device. The medical device connection structure according to claim 1, wherein the medical device connection structure is rotatable with respect to the medical device. A blood reservoir having a blood storage chamber partially protruding from the center of the bottom surface of the main body, and having a blood outflow port at the lower end of the blood storage chamber and a blood inflow port at the top of the main body When,
An extracorporeal circulation processing apparatus comprising a blood flow path for performing gas exchange by crossing a gas flow path and blood, and comprising an artificial lung connected to the blood reservoir,
The medical device connection structure according to claim 1, wherein the blood reservoir is the first medical device and the artificial lung is the second medical device, and the blood reservoir is connected to the blood via the connection member. The oxygenator is supported,
The blood reservoir includes a coupling portion that protrudes downward at a position separated from the blood reservoir on the bottom surface of the main body portion and is coupled to the first fitting portion of the coupling member,
The fitting inner cylinder part is an extracorporeal circulation processing apparatus provided in the upper part of the artificial lung.

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