JPH025795Y2 - - Google Patents

Description

[Detailed explanation of the invention] Background of the invention (1) Technical field The invention is provided in the front stage of the oxygenator and is supplied to the oxygenator; it is integrally equipped with a heat exchanger that raises blood to a predetermined temperature. This invention relates to an oxygenator with a heat exchanger.

(2) Prior art and its problems In general, in this type of oxygenator, both ends are connected to the first
and a cylindrical heat exchanger housing that is closed by a second plate and into which a heating fluid flows; a heat exchanger section having a plurality of fixed heat exchange tubes through which venous blood flows, and a cap facing said first plate and defining an inlet chamber therebetween; A cylindrical artificial lung housing to which oxygen is supplied; an oxygen-permeable hollow fiber bundle provided within the housing through which blood flows; and a bundle of hollow fibers provided at both ends of the housing to close the fibers. an oxygenator having first and second partition walls fixed to the hollow fiber bundle; and an oxygenator provided so as to surround the ends of both the housings;
The first partition plate and the first partition face each other, and a connecting cylinder connects both housings. Then, when the heat exchanger section and the oxygenator section are connected by the connecting cylinder, the second plate and the first It was necessary to form a communication chamber between the two bulkheads. Conventionally, in order to form this connecting chamber, an annular spacer with a T-shaped cross section is interposed between the second plate and the first partition, and a sealing material is placed between the spacer and the connecting cylinder. Filling, securing a designated space in the communication chamber, and sealing were performed at the same time. However, using a spacer to form a predetermined communication chamber between the heat exchanger section and the oxygenator section not only increases the number of parts, but also separates the spacer between the second plate and the first plate. It took time and effort to insert the spacer between the spacer and the partition wall, and sometimes the position of the spacer was shifted, and when the sealant was filled later, the sealant did not spread sufficiently and there was a risk of seal leakage. In particular, the sealing properties between the plate formed of a hard material and the spacer surface are poor, and in order to ensure a secure seal, pour adhesive into the sealing area, seal it, and inspect the sealing condition (for example, The only way to fill the sealant was to leave one port open, seal the other ports, and apply pressure to the open ports to ensure that no liquid leaked out.

Purpose of the invention The present invention was devised to solve the drawbacks of the above-mentioned prior art, and it connects the heat exchanger section and the oxygenator section so as to form a communication chamber between them. In this case, the number of parts is small,
Moreover, it is an object of the present invention to provide an oxygenator with a heat exchanger that is free from the risk of seal failure and has excellent workability.

Specific Description of the Invention The oxygenator with a heat exchanger according to the present invention includes a heat exchanger section and an oxygenator section that are arranged in line with each other, and the heat exchanger section has both ends connected to a first A cylindrical heat exchanger housing that is closed by a second plate and into which a heating fluid flows; a plurality of heat exchange tubes which are fixed and have blood flowing therethrough; and a cap which is disposed facing the first plate and forms an inlet chamber therebetween; The oxygenator part consists of a cylindrical housing for the oxygenator part into which oxygen-containing gas is supplied, a hollow fiber bundle for gas exchange provided inside the housing and through which blood flows, and a bundle of hollow fibers installed at both ends of the housing. , a first fixing the hollow fiber bundle to the oxygenator housing without blocking the ends of the hollow fibers;
and a second partition wall, the oxygenator with a heat exchanger is provided so as to surround the ends of both the housings, and the oxygenator is provided with the second plate and the first partition wall. a connecting cylindrical body connecting both housings with the partition walls facing each other, and further, the second plate is integrally provided on the outer periphery so as to protrude in the direction of the first partition wall. It has an annular convex shape, and the tip of the annular convex abuts the first partition wall in a liquid-tight manner, and the width of the contact surface with the first partition wall is 0.2 to 2 mm.
and a communication chamber is formed between the second plate including the annular protrusion and the first partition wall, and a communication chamber is formed between the outer peripheral surface of the annular protrusion and the cylindrical body. It is characterized by a sealing material being filled in between.

Preferably, the annular protrusion is formed integrally with the second plate. Further, the width of the abutting surface of the annular protrusion against the partition wall of the oxygenator part is preferably 0.2 to 2 mm. If it is less than 0.2 mm, it will dig into the partition wall so much that it may cause damage to the partition wall. Also, if it is 2 mm or more, it will not penetrate into the partition wall easily.
If the surface of the partition wall is even slightly rough, there is a risk of poor sealing.

Next, an oxygenator with a heat exchanger according to an embodiment of the present invention will be described with reference to the accompanying drawings.

In the figure, numerals 1 and 2 indicate a heat exchanger section and an oxygenator section, respectively, which are arranged in a line and connected to each other by a connecting cylinder 3. This heat exchanger section 1 has a cylindrical heat exchanger housing 6 with first and second plates 4, 5 closed at both ends and defining a heat exchange chamber inside. Heat exchange tube bodies 7, 7... are housed so that their outer peripheral surfaces are spaced apart from each other by a predetermined distance. The material of the heat exchange tube 7 is heat resistant, has high thermal conductivity, does not bend even when made thin, and is inexpensive, preferably a metal such as stainless steel. Both ends of each heat exchange tube body 7 are liquid-tightly fixed in small holes formed in the plates 4 and 5 with both ends open. Furthermore, even if the plates 4 and 5 are not fitted in a liquid-tight manner, by injecting a potting agent into the inner side surfaces of the housing 1 of the plates 4 and 5, a potting layer is formed and both ends of each heat exchange tube 7 are attached to the plate. It may be fixed in a dense state. In this case, the potting layer has the function of gluing the plates 4, 5 to the housing 1.
The plates 4 and 5 are made of synthetic resin, for example,
Polycarbonate, polypropylene, styrene
Any resin that can be molded into a plate shape may be used, such as butylene-styrene copolymer. An inlet port 8 and an outlet port 9 are integrally protruded from the peripheral wall of the housing 6. Housing 6
A funnel-shaped cap 10 is attached to one end coaxially with the housing 6 by means described below, and an inlet chamber is defined between the outer surface of the first plate 4 and the inner surface of the cap 10. ing. An inlet port 11 is integrally provided in the center of the cap 10 and projects outward. Further, the upper surface of the outer peripheral portion of the cap 10 is formed flat so as to be substantially parallel to the outer surface of the first plate 4. The entire cap 10 is designed so that its outer diameter is approximately the same as the outer diameter of the housing 6. A male thread is formed on the outer peripheral surface of one end of the housing 6, and a female thread formed on the inner peripheral surface of the tightening cylinder 12 constituting the tightening member meshes with this male thread. A flange portion projecting radially inward is formed at one end of the tightening cylinder 12 . This flange portion is attached to the cap 10 when the cylindrical body 12 is screwed into the male thread of the housing 6.
The cylindrical body 12 engages with the flat upper end surface of the outer circumferential portion of the cylindrical body 12 and presses it toward the housing, thereby allowing the housing 6 and the cap 10 to be attached to each other by the cylindrical body 12. Near the outer peripheral end of the outer surface of the first plate 4, an annular protrusion with an inclined inner peripheral surface is integrally provided in the direction of the cap 10. On the other hand, near the outer circumferential end of the inner circumferential surface of the cap 10, an annular protrusion having an inclined surface formed on the outer circumference is integrally provided to protrude in the direction of the first plate 4. Thus, when the cap 10 is tightened in the direction of the housing 6 by the tightening cylinder 12, the inclined surfaces of both protrusions are pressed against each other and come into surface contact, and the inlet chamber surrounded by these protrusions is sealed. . After this, a synthetic resin such as urethane resin is injected through the through hole 10a formed in the peripheral wall of the cylinder 12, and the gap between the cylinder 12, the first plate 4, and the cap 10 is filled and sealed. Ru.

The artificial lung section 2 has a cylindrical artificial lung housing 13 with both ends open. This housing 1
A gas exchange hollow fiber bundle 14 having a large number of small holes formed in its peripheral wall so as to allow oxygen to pass therethrough is accommodated in the chamber 3 . This hollow fiber is preferably a porous hollow fiber, and is particularly made of a porous polyolefin resin, such as polypropylene or polyethylene, with polypropylene being particularly preferred. Its inner diameter is about 10
~10,000 microns, a wall thickness of approximately 10-50 microns, an average pore diameter of approximately 200-2,000 angstroms, and a porosity of approximately 20-80%. One end of this hollow fiber bundle 14 is connected to the housing 1 by a first partition wall 15 as a potting agent made of urethane resin.
It is fixed to one end of 3. This partition wall 15 is
One end of the housing 13 is airtightly sealed and faces the second plate 5 of the heat exchange section at a predetermined distance so as to define a communication chamber between the housing and the second plate 5, as will be described later. The other end of the hollow fiber bundle 14 is fixed to the other end of the housing 13 by a partition wall 16 similar to the partition wall 15.
Further, an inlet port 17 is provided on the peripheral wall of the housing 13.
Additionally, an outlet port 18 is integrally provided. At the other end of the housing 13, a funnel-shaped cap 19 is provided with an outlet port 20.
is attached by a tightening cylinder 22 having the same structure and function as the tightening cylinder 12 described above. Also,
The seal between the cap 19 and the second partition wall 16 is also achieved by an annular protrusion and filling with synthetic resin, as in the case of the heat exchanger section 1.

External threads in the same direction are formed on the outer peripheries of the ends of the heat exchanger housing 6 and the oxygenator housing 13 that are close to each other. These male threads have a connecting cylinder 3 with a female thread formed on the inner circumferential surface.
are screwed together, and thus both housings are coaxially connected in a row by the cylindrical body 3. Near the outer periphery of the outer surface of the second plate 5, a second
As shown in detail in the figure, an annular protrusion 21 is integrally provided. This annular protrusion 21 is tapered so that the width becomes narrower toward the tip. The width of the contact surface of this tip that contacts the first partition wall is set to be 0.2 to 2 mm. Thus, when the housings 6 and 13 are screwed together in the connecting cylinder 3 so as to approach each other, the contact surface of the annular protrusion 21 is in the first position.
The outer surface of the partition wall 15 contacts the outer surface of the partition wall 15, and a seal is established therebetween. The portion of the partition wall 15 that the protrusions 21 come into contact with is a region where no hollow fibers exist. As a result, this protrusion, the second plate and the first
A communication chamber is formed between the partition wall and the partition wall. After this, a synthetic resin such as urethane resin is injected through the through hole 3a formed in the peripheral wall of the connecting cylinder 3, and is filled between the cylinder 3 and the annular protrusion 21 to complete the sealing. Ru. The sealing state can be confirmed by sealing all but one of the ports and pressurizing gas through the open port. At this time, the protrusions 21 also come into contact with the partition wall surface which has some elasticity, so that a sufficient seal is achieved. Therefore, there is no need to worry about adhesive flowing into the communication chamber.

The operation of the artificial lung configured as described above will be explained below.

First, venous blood supplied from the outside to the inlet port 11 passes through the inlet chamber and is dispersed into a large number of heat exchange tubes 7, 7, . . . , and flows through these toward the communication chamber. Then, it flows from this communication chamber into the hollow fiber bundle 14, and is further discharged from the outlet chamber to the outside via the outlet port 20. When venous blood is flowing through the heat exchange tube 7, the venous blood is warmed to a predetermined temperature via the heat exchange tube 7 by the hot water flowing into the heat exchanger housing 6 from the inlet port 8. Furthermore, while warmed venous blood is flowing through the hollow fiber bundle 14, oxygen gas flowing into the oxygenator chamber 13 from the inlet port 17 passes through the hollow fibers and is supplied to the venous blood. is arterialized. In such a process,
Venous blood supplied from the heat exchange tube 7 to the communication chamber does not leak to the outside because this chamber is sealed by the annular protrusion.

Incidentally, in the above embodiment, the connecting cylinder and the housing are connected by screwing, but they may be connected by other means, such as a snap connection. In addition, the configuration of the heat exchanger section and oxygenator section is as follows:
This is not limited to the above formats. Also,
In the above explanation, the cylindrical body constituting the tightening member is used to attach the cap to the heat exchange housing, but the present invention is not limited to this. A housing attachment part may be provided to attach the cap to the heat exchange housing. In this case, instead of using a screw mechanism for the housing attachment part of the housing and the cap, the housing may be attached in a pressed state using an adhesive or by heat fusion (for example, high frequency or ultrasonic fusion). .

Specific Effects of the Invention As explained above, the oxygenator with a heat exchanger according to the present invention connects the heat exchanger housing and the oxygenator housing with the connecting cylinder so as to form a communication chamber between them. When connecting the connecting cylinders at a predetermined interval, the annular protrusions integrally protruding from the second plate are arranged so as to function as a spacer and a sealing member. Since the tip is brought into pressure contact with the first partition wall, there is no need for an extra sealing member such as a spacer having a T-shaped cross section, and the number of parts can be reduced. Further, when connecting both housings, it is sufficient to simply tighten the two using the connecting cylinder, so the operation is simple and reliable. And, since the annular protrusion does not shift its position during the connection operation,
The distance between the protrusion and the connecting cylindrical body is always constant over the entire circumference, and there is no non-uniformity in the sealing member injected here.

[Brief explanation of the drawing]

Figure 1 is a partially cutaway perspective view of an oxygenator with a heat exchanger according to the present invention, and Figure 2 is an enlarged view of the seal between the heat exchanger part and the oxygenator part shown in Figure 1. FIG. DESCRIPTION OF SYMBOLS 1... Heat exchanger part, 2... Oxygenator part, 3... Connection cylinder, 5... Second plate, 6... Housing for heat exchanger, 13... Housing for oxygenator, 1
5...First partition, 21...Annular protrusion.

Claims (1)

[Scope of utility model registration request] The heat exchanger section includes a heat exchanger section and an oxygenator section that are arranged in line with each other, and the heat exchanger section is a cylindrical tube whose both ends are closed by first and second plates and into which a heated fluid flows. a heat exchanger housing; a large number of heat exchange tubes housed within the housing; both ends open, liquid-tightly fixed to first and second plates, and into which blood flows; a cap provided facing the first plate and forming an inlet chamber between the cap and the first plate; A housing for an artificial lung part, a hollow fiber bundle for gas exchange provided inside the housing and into which blood flows, and a hollow fiber bundle provided at both ends of the housing without blocking the ends of the hollow fibers. in the oxygenator with a heat exchanger, the oxygenator with a heat exchanger is provided with first and second partition walls that fix the oxygenator to the oxygenator housing, and the oxygenator with a heat exchanger is provided so as to surround the ends of both the housings. , the second plate and the first partition face each other, and have a connecting cylindrical body that connects both housings, and further, the second plate has the first partition wall on an outer peripheral part. It has an annular convex shape integrally provided so as to protrude in the direction, and the tip of the annular convex abuts the first partition wall in a fluid-tight manner, and also makes contact with the first partition wall. The width of the surface is
A communication chamber is formed between the second plate and the first partition wall, the diameter of which is 0.2 to 2 mm, and which includes the annular protrusion, and further includes a communication chamber between the outer circumferential surface of the annular protrusion and the cylinder. An oxygenator with a heat exchanger that is characterized by having a sealing material filled between it and the body.