JPS6330442Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a blood vessel, particularly a blood vessel that can be suitably used in a blood circuit of an extracorporeal circulation device during surgery.

Extracorporeal circulation devices used for implanted organs always require a blood circuit, and in that circuit, a turbulator is installed to filter blood and remove air (bubbles) that may be mixed in. There is a need. For this reason, various filter devices have been proposed in the past, but in general, filters tend to become clogged, which causes problems such as becoming unusable in a short period of time and making it impossible to perform a surgery midway through the procedure. It is also possible to increase the size of the overflow device and increase the overflow area, but in such a case, the amount of residual blood in the overflow device will increase and blood loss will increase. This causes the problem mentioned above.

The present invention was developed in light of these circumstances. It is small and easy to handle, has a small amount of residual blood, and also directs the blood from the lower inlet to the horizontal top surface of the filter without flowing it directly. After that, it is made to flow out from the lower outlet to facilitate deaeration on the superfilter,
Furthermore, by connecting a plurality of devices via bypass tubes, the extracorporeal blood circulation device can dramatically increase the overcapacity (time) and easily cope with long-term surgeries. The purpose is to

Embodiments of the present invention will be described below based on the drawings.

Figures 1 and 2 show an example of the present invention.
The main body 1 of the main body 1 has an approximately truncated pyramid shape that is tapered in the lateral direction as a whole, and the main body 1 of the main body 1 is divided into an upper case 2 and a lower case 3 along the longitudinal direction. It has a two-part structure, and can be assembled by bonding both cases 2 and 3 together via a fitting part 4.

Further, an inlet 5 is formed on the lower side of the lower case 3 at the large diameter end 1a of the filter main body 1 having a tapered shape, and a small diameter end of the filter main body 1 at the inlet 5 is formed. An outflow port 6 is formed adjacent to the position on the 1b side, and the inflow port 5 and the outflow port 6 are formed inside (upper side) of the lower case 3.
A separation wall 7 is formed to separate and guide the inside.

Furthermore, on the outside (upper side) of the upper case 2,
A bypass outlet 8 is provided, as well as an air vent/pressure detection hole 9. A bypass tube 11 equipped with an on-off valve 10 is connected to the bypass outlet 8, and an air bleed stopper 12 is usually attached to the air bleed/pressure detection hole 9, and if necessary, this air bleed stopper is installed. By removing the stopper 12, it is possible to detect the pressure inside the filter body 1 through the hole 9 using a commonly used pressure detector (not shown).

When the upper case 2 and the lower case 3 are fitted and bonded together, the case 2,
A horizontal superfilter 14 is provided between the cases 2 and 3 by the step portion 13 formed in the filter body 1 and the upper end 7' of the separation wall 7. A communication channel 1 that communicates the inlet 5 and the bypass outlet 8 is provided inside.
5, a tapered upper chamber 16 communicating with the flow path 15, and a tapered lower chamber 17 partitioned by the separation wall 7.

For example, as shown in FIG. 3, the superfilter 14 is fixed to or integrally formed with a filter frame 18 having a required strength.
It consists of a filter 19 having a mesh of about 20 to 60 microns. As long as the filter 19 has an uneven shape, it may have a corrugated shape as shown in FIG. 4, or it may have a protruding shape as shown in FIG. Also, the above filter 1
The number 9 may be a single layer or may be composed of a plurality of layers.

In the above configuration, blood introduced from the venous side A through the inflow port 5 as shown by the arrow is led to the upper chamber 16 through the communication channel 15 and passed through the superfilter 14 . At this time, since the blood flows on the upper surface of the overfilter 14, air bubbles mixed in at that time are effectively lifted and degassed. The filtered blood is sent from the lower chamber 17 to the artery side B via the outlet 6. At this time, since the inflow port 5 and the outflow port 6 are arranged in parallel downwardly, handling such as connection operation of the tube is convenient and simple, and there is an advantage that bending of the tube does not easily occur. Furthermore, the filter body 1
Since it is small and has a tapered shape, the amount of residual blood is small and blood loss can be kept to a minimum. Furthermore, it is possible to easily change the mesh of the filter 19 to create a filter suitable for handling excess fluid and waste matter.

When the overfilter 14 is used for a long time,
Clogging occurs due to blood clots, etc., and the pressure inside the diaphragm body 1 increases. For this reason, the pressure inside the filter main body 1 is checked by a pressure detector (not shown) through the air vent/pressure detection hole 9, and when the flow resistance value reaches, for example, 300 mmHg or more, the on-off valve 10 of the bypass tube 11 is opened. the blood flows out from the bypass outlet 8. At this time, if another diaphragm is connected to the bypass tube 11, the capacity (time) of the diaphragm can be dramatically increased and extracorporeal circulation for a long period of time becomes possible.

Fig. 6 shows one example of such a case, in which the inlet 5' of another filter body 1' constructed in the same manner is connected to the end of the bypass tube 11 provided in the filter body 1. Also, an opening and closing valve 21 is provided on an outlet tube 20 connected to the outlet 6 of the filter body 1, and further, the outlet tube 20 and the filter body 1'
and an outlet tube 22 connected to the outlet 6' of Y
It is configured so that it is led to the arterial side B via a tubing 23.

Further, the pressure inside the filter main bodies 1 and 1' is separately detected by a pressure detector 24, and the detected pressure is used to determine the pressure inside the outflow tube 20.
on-off valve 21 and each bypass tube 11,
The on-off valves 10 and 10' shown in FIG. 11' are opened and closed.

In the above, at the start of extracorporeal circulation, the pressure inside the filter main body 1 is low, and in this state, the on-off valve 21 is opened and the on-off valve 10 is closed. Therefore, blood from the venous side A is passed through the overfilter 14 in the main body 1 and then sent to the arterial side B via the outflow tube 20. This allows extracorporeal circulation for the required time.

However, when extracorporeal circulation is performed for a long time due to a long-term surgery, the filter 19 becomes clogged with blood clots and becomes inoperable.
Pressure increases. When this pressure reaches the 300 mmHg limit range, the on-off valve 10 is opened and 21
is closed. Further, since the pressure inside the filter main body 1' is low, the on-off valve 10' is closed. As a result, the blood passes through the inside of the blood vessel body 1, is guided into the blood vessel body 1', is filtered by the blood filter 14', and is then sent to the artery side B via the outflow tube 22. This allows the elapsed time to be doubled. Note that the pressure detection by the pressure detector 24 can be carried out periodically after a required period of time, or by connecting a Y-tube to the hole 9 so that air venting and pressure detection can be performed separately. It may be done continuously,
Further, the opening/closing operations of the on-off valves 21, 10, 10' may be performed manually based on the pressure value of the overpressure device, or may be performed automatically.

Incidentally, the present invention is not limited to the above-described embodiment, and the opening and closing valve may be of a type disposed in the flow path, or of a type in which the tube is clamped from the outside, and various other modifications may of course be made without departing from the spirit and scope of the present invention.

According to the above-mentioned extracorporeal blood circulation device of the present invention, the following excellent effects can be achieved.

(i) Since the main body of the diaphragm is small and has a tapered shape to eliminate wasted internal space, the amount of residual blood is small and blood loss can be reduced.

(ii) The inlet and outlet are arranged side by side on the lower side, and the blood led from the lower side to the upper side is guided downward from the upper part through the overfilter, so the blood flow is smooth and fresh. No significant air entrainment occurs and effective degassing takes place in the flow.

(iii) Since the inlet and outlet are arranged side by side, it is advantageous for handling operations such as tube connections.

(iv) By having a bypass outlet connected to a bypass tube with an on-off valve, it is possible to connect multiple evaporators and easily extend the extracorporeal circulation time dramatically. .

(v) Since the overfilter has an uneven shape, the overpass area can be increased and the overefficiency can be increased.

[Brief explanation of the drawing]

FIG. 1 is a cutaway front view showing an embodiment of the present invention;
2 is a view in the direction of the − arrow in FIG. 1, FIG. 3 is an explanatory diagram showing an example of an overfilter, and FIGS. 4 and 5 are explanatory diagrams showing examples of the shape of the unevenness of the filter, respectively.
FIG. 6 is a diagram showing an embodiment in which two overloaders of the present invention are connected to extend the overtime. 1 is the filter body, 2 is the upper case, 3 is the lower case, 5 is the inlet, 6 is the outlet, 7 is the separation wall, 8
is a bypass outlet, 9 is an air vent and pressure detection hole, 1
0 is an on-off valve, 11 is a bypass tube, 14
15 is a communication flow path, 16 is an upper chamber, 17 is a lower chamber, and 24 is a pressure detector.

Claims (1)

[Scope of utility model registration request] An inlet and an outlet are provided on one side of the large diameter end of the filter main body, which has a tapered shape in the longitudinal direction, and a bypass tube with an on-off valve is connected to the other side, and a bypass outlet and an air vent and an outlet are provided on the other side. A hole for pressure detection is provided, and the filter main body further includes a communication channel communicating with the inlet and the bypass outlet, an upper chamber communicating with the communication channel, and a lower chamber communicating with the outlet. 1. A blood filter for extracorporeal circulation, characterized in that a filter for extracorporeal blood circulation is provided, which is arranged along the longitudinal direction of a main body of the filter so as to partition a chamber, and has a concavo-convex shape.