JPH0212108B2 - - Google Patents

Description

BACKGROUND OF THE INVENTION A. Technical Field The present invention relates to pumps, and more particularly to pumps, such as medical pumps, in which the transfer system is sealed from the drive system.

B. Prior art and its problems For example, medical pumps used in extracorporeal circulation devices such as heart-lung machines and artificial kidneys, which form extracorporeal circulation systems, are extremely susceptible to bacterial contamination. Therefore, the transport system in which the body to be transported such as blood circulates needs to be separated from the drive system and have a sealed structure to prevent contaminants such as bacteria from entering from the outside.

Extracorporeal circulation systems are often used, especially in surgeries. It is desirable for medical pumps used in operating rooms and the like to be located as close to the patient, ie, the operating table, as possible. This is because if the pump is located far away, not only is it inconvenient to operate the device, but there is also a greater risk of accidents due to lack of attention.Furthermore, the circulation circuit is long, so due to increased opportunities for pollution and accidents.

Therefore, it is preferable that the pump be small enough to be installed near the circulation system and not be a hindrance to operation.

Due to these requirements, roller pumps and finger pumps have conventionally been used as medical pumps for circulating relatively large amounts of liquids such as blood. A roller pump works by having a roller cyclically run on the outer surface of a flexible tube made of elastic synthetic resin, and a finger pump uses a finger that moves up and down in a cyclical manner on the outer surface of a flexible tube. This causes peristalsis in the tube to transfer the liquid to be transferred. However, in any case, the flexible tube undergoes elastic deformation, which often causes material fatigue, and when the roller or finger leaves the tube, undesirable backflow occurs in the transferred liquid due to the return of the tube wall. There is.

Syringe pumps are often used to inject a relatively small amount of liquid into a living body, but since the amount transferred is small, this pump is not suitable for a circulation system for a relatively large amount of liquid to be transferred.

Purpose of the invention The present invention overcomes the drawbacks of the prior art,
The object of the present invention is to provide a small-sized medical pump in which the drive system is very close to the transfer system.

According to the present invention, a medical pump coupled to an extracorporeal circulation apparatus includes a transfer system unit that forms a part of a transfer path for a liquid to be transferred, and a transfer system unit that is substantially independent of the transfer system unit from the outside. The transfer system unit includes a rotating member that rotates and transfers the liquid to be transferred in the transfer path, and the drive system unit is connected to the transfer system unit. It has an armature that rotates the rotating members in the assembled state.

According to one feature of the present invention, the rotating member of the transfer system unit includes a cylindrical rotor having a long axis in the transfer direction of the transfer path, and a cylindrical rotor that is fixed to the rotor and rotates to transfer the rotor in the transfer direction of the transfer path. fins for transferring liquid.

According to another feature of the invention, the armature of the drive system unit is arranged to surround the cylindrical circumferential surface of the rotor when combined with the transfer system unit.

DETAILED DESCRIPTION OF THE INVENTION Next, embodiments of the medical pump according to the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIGS. 1 and 2, an embodiment in which a medical pump according to the present invention is applied to an artificial lung is shown. Of course, the present invention is not limited to artificial lungs, but can also be advantageously applied to artificial kidneys and the like.

In this embodiment, the oxygenator 10 has an overall cylindrical external shape, and includes an oxygenator part 12 that melts oxygen in the air into blood as a transferred body, and an oxygenator part 12 that melts oxygen in the air into blood as a transported object, and an oxygenator part 12 that melts oxygen in the air into blood as a transported object. The heat exchange parts 14 are arranged so that their cylindrical central axes coincide with each other, and are connected to each other.

The pump 100 consists of a transfer system unit 102 and a drive system unit 104 that are separable from each other.
These also have a cylindrical external shape, as shown in the cross-sectional view. The transfer system unit 102 is
In this embodiment, the cylinders are connected to the heat exchanger 14 so that their cylindrical center axes coincide with each other.

The transfer system unit 102 has a cylindrical housing 108, with a tubular liquid inlet 1 at its free end.
06 is provided. In addition, the housing 108
A cylindrical rotor 112 is held inside by two bearings 110, and a plurality of blades 114 are fixed to the inside of the rotor 112. Therefore, when the blade 114 rotates in a predetermined direction as described later, blood as the liquid to be transferred flows into the inlet 10.
6 into the unit 102, passes through the heat exchange section 14 and the oxygenator section 12, and flows out through the outlet 16.

The inner surfaces of the rotor 112 and the housing 108 are preferably made of or coated with a highly biocompatible material, such as a material with antithrombotic properties, when the liquid to be transferred flowing therein is blood. Antithrombotic materials include silicones (e.g., polydimethylsiloxane,
Polymethylphenylsiloxine) polyhydroxymethacrylate, hydroxymethacrylate-styrene copolymer, etc.

The heat exchange section 14 has an inlet 18 through which a heat exchange medium such as hot water flows, and an outlet 20 through which the heat exchange medium that has circulated inside the heat exchange section 14 flows out. In the heat exchange section 14, heat exchange is performed by the blood coming into contact with warm water through the tube wall of the transfer path, and the blood is heated to a desired temperature.

The oxygenator 12 has an inlet 22 through which oxygen or air flows, and an outlet 24 through which the oxygen or air that has passed through the oxygenator 12 flows out. In the artificial lung section 12, the blood comes into contact with oxygen or air through the tube walls of multiple hollow fibers made of gas-permeable resin such as porous polypropylene or silicone rubber, so that the oxygen or air melts into the blood. The blood is then pumped out through the outlet 16 as fresh blood.

These unit 102, heat exchange section 14, and oxygenator section 12 are constructed into a single device, and constitute disposable oxygenator lung 10.

The drive system unit 104 has two cylindrical casings 120, large and small, as shown in the cross-sectional view.
and 122 and two generally annular support members 124 supporting them, the smaller casing 122 being designed to have an inner diameter slightly larger than the outer diameter of the housing 108 of the unit 102. Therefore, when operating this device, as shown in FIG.
can be fitted into the unit 102 and fixed together by an engaging member (not shown).

The support member 124 includes an annular fixed support member 126.
is retained. This is the drive system unit 10
When the rotor 4 is fitted into the transfer system unit 102, the rotor 114 is held in a rotatable operating state by cooperating with the bearing 110 of the unit 102.

On the outside of the inner casing 122, as shown in the figure, a plurality of armatures 128 are arranged on a circumference centered on the central axis of the cylinder. The armature 128 is
It has an iron core 130 and a coil 132, and functions as a field. This is done by supplying alternating current or direct current power to the power line 134.
generates a magnetic field that drives the rotation.

Specific Operation of the Invention Both units 102 and 104 are assembled in the state shown in FIG. 2 when the device is used. That is, the transfer system unit 102 is inserted and engaged inside the casing 122 of the drive system unit 104. Fixed support member 126 of unit 104 then cooperates with bearing 110 of unit 102 to maintain rotor 114 in a rotatable operating condition.

Therefore, when AC or DC power is supplied to the power line 134, a rotating magnetic field is generated in the armature 130,
The rotor 114 is rotationally driven. This causes the blades 114 of the rotor 112 to rotate in a predetermined direction,
Blood as a liquid to be transferred flows into the unit 102 from the inlet 106, passes through the heat exchange section 14 and the oxygenator section 12, and flows out from the outlet 16. At this time, heat exchange is performed between the blood and hot water in the heat exchange section 14, and the blood is heated to a desired temperature. Further, in the artificial lung section 12, the blood is melted into blood by coming into contact with oxygen or air, and is sent out as fresh blood from the outlet 16.

Concrete Effects of the Invention According to the present invention, the pump drive system and the transfer system are arranged very close to each other and are configured to be detachable. Further, the transfer system unit is configured to be disposable together with the extracorporeal circulation device. Therefore, not only is the device compact and does not require a large installation space, but the circulation circuit has few connection points and the distance is short, so there is less risk of bacterial contamination and accidents, and it is easy to handle and operate. be.

The present invention is applicable to medical pumps that transfer a large amount of liquid, such as the heart-lung machine shown in the figure, of about 1,000 to 5,000 milliliters per minute, and furthermore, to pumps that transfer a large amount of liquid, such as an artificial kidney, that transfers a large amount of liquid, about 100 to 400 milliliters per minute. Also effectively applied to medical pumps.

For example, when applied to a heart-lung machine, the priming volume can be reduced because the circulation circuit is simpler and shorter than conventional roller pumps. In addition, there is no undesirable backflow in roller pumps, finger pumps, etc., and there is also no pulsation.

[Brief explanation of drawings]

1 and 2 are partially sectional front views showing an embodiment of the medical pump according to the present invention, and FIG.
The figure shows the two units separated, and FIG. 2 shows the two units combined. Explanation of symbols of main parts, 10... Artificial lung, 10
0... Pump, 102... Transfer system unit, 10
4... Drive system unit, 108... Housing,
112...rotor, 114...blade, 130...
Armature, 120, 122...Casing.

Claims (1)

[Claims] 1. A medical pump coupled to an extracorporeal circulation device, the medical pump being coupled to the extracorporeal circulation device and forming a part of a transfer path for a liquid to be transferred to a living body. It consists of a transfer system unit, and a removable drive system unit that is independent of the transfer system unit and substantially covers the transfer system unit from the outside, and the transfer system unit rotates by receiving a magnetic field. A cylindrical rotor that is driven and has a long axis in the transfer direction of the transfer path, and a fin fixed to the rotor that transfers the transferred liquid in the transfer direction of the transfer path when the rotor is rotationally driven. A medical device characterized in that the drive system unit has an armature that generates the magnetic field so as to rotate the rotation member when combined with the transfer system unit. pump. 2. Claim 2, wherein the armature of the drive system unit is arranged so as to surround the cylindrical peripheral surface of the rotor when combined with the transfer system unit. Medical pump as described.