JP4224760B2 - Centrifugal pump with cover - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a centrifugal pump used for cardiac surgery and circulation assistance, and more particularly to a centrifugal pump with a cover that can ensure a clean field and achieve both a small priming amount.
[0002]
[Prior art]
When performing cardiac surgery or circulatory assist treatment, the patient and external machinery such as a heart-lung machine are connected by a blood circuit tube constituting a blood circuit, as shown in FIG. In FIG. 5, reference numeral 21 denotes a centrifugal pump having an inlet port 22 and an outlet port 23, to which blood circuit tubes 24 and 25 are connected, respectively. The tips of the blood circuit tubes 24 and 25 are connected to the patient to form a circulation path. A drive motor unit 26 is coupled to the lower part of the centrifugal pump 21 to drive the centrifugal pump 21. The drive motor unit 26 is supplied with drive voltage from the main power supply 28 via the control device 27.
[0003]
The surgical field side where the patient and the practitioner are present must always be kept clean, and therefore it is necessary to keep a distance from unclean external machinery such as the drive motor unit 26 and the control device 27. As a result, the blood circuit tubes 24 and 25 become longer, which causes an increase in the priming amount.
[0004]
On the other hand, Japanese Patent Application Laid-Open No. 2001-321390 discloses that a blood circuit tube is passed through a sanitary sheet having an opening, and the blood circuit tube is fixed to the periphery of the opening. By isolating with a sanitary sheet, it is possible to shorten the blood circuit tube by arranging external machinery as close to the patient as possible.
[0005]
[Problems to be solved by the invention]
However, even when the conventional sanitary sheet is used, it is necessary to secure a practitioner space between the patient and the sanitary sheet, and there is a limit to shortening the blood circuit tube.
[0006]
If a centrifugal pump is placed in the surgical field in the immediate vicinity of the patient, the blood circuit tube can be shortened and the priming amount can be greatly reduced. To achieve this, a drive motor unit for rotating the pump is used. Need to be installed near the patient. Moreover, it is necessary to sterilize in advance to ensure cleanliness.
[0007]
The pump has no problem in sterilization due to its structure. However, the drive motor is difficult to guarantee against the functional impact of sterilization. That is, in the sterilization process, a heat load, a gas, a pressure load, and the like are repeated, and for example, there is a risk of a decrease in magnetic force due to the heat load of the drive magnet. In addition, since prior sterilization is required, it is difficult to respond to emergency surgery.
[0008]
Accordingly, an object of the present invention is to provide a centrifugal pump that enables an unsterile drive motor unit to be installed in the vicinity of a patient without impairing the cleanliness of the surgical field.
[0009]
[Means for Solving the Problems]
The centrifugal pump with a cover according to the present invention has, as a basic configuration, a centrifugal pump body having a configuration in which an impeller is rotatably supported inside a housing, and a magnetic coupling portion that transmits rotation to the impeller, and the housing and a cover joined to the outer peripheral portion of the front Symbol centrifugal pump body, the configured drive motor unit to the magnetic coupling portion from the outside of the housing so as to be able to magnetically coupled, prior Stories cover The region including the inlet port and the outlet port formed in the housing and the region including the portion corresponding to the magnetic coupling portion are joined to the outer peripheral portion of the housing at a position where they are separated from each other. The cover is made of a material having a higher thermal conductivity at a portion close to the drive motor unit than at other portions .
Further, the centrifugal pump with a cover of the present invention having another configuration has the above basic configuration, and in the state before the drive motor unit is mounted, the cover is connected to the clean field side and the surgical field of the centrifugal pump body. Wrapping the side blood circuit tube.
[0010]
According to this configuration, the cleanness can be ensured by surrounding the non-sterile drive motor unit by the cover joined to the centrifugal pump body, and the centrifugal pump body can be disposed in the vicinity of the patient. Further, since the cover is joined so that the magnetic coupling portion is included on the side different from the region including the inlet port and the outlet port, the presence of the cover is magnetic when the drive motor unit is coupled to the centrifugal pump body. It does not obstruct the connection or dispose of the blood circuit tube connected to the inlet / outlet port.
[0011]
The cover has a size capable of enclosing at least a part of the drive motor unit and the power supply cord in a state where the drive motor unit is mounted so as to be coupled to the magnetic coupling portion of the centrifugal pump body. preferable. As a result, contamination of the centrifugal pump body and blood circuit, which are easily filthy because they are in the vicinity of the drive motor unit and the power cord, can be prevented, and the cleanliness of the minimum area required in the surgical field can be maintained.
[0012]
Also the cover, Ru can be formed by the integral joining a plurality of subelements. Or the cover was the site surrounding the power cord of the drive motor unit, it is preferably formed of a material having a transparent and flexible. Moreover, it is preferable that the said cover is equipped with the fixing tool for fixing the peripheral part.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a front view of a centrifugal pump with a cover according to an embodiment of the present invention, partially shown in cross section. A centrifugal pump body 1 has a housing 2, an inlet port 3, and an outlet port 4. Although not shown, the housing 2 has a pump chamber formed therein, and the impeller is rotatably supported. A motor coupling portion 5 is provided at the lower portion of the housing 2, and the drive motor unit 6 can be coupled thereto.
[0015]
The drive motor unit 6 has a drive-side magnetic coupling portion 7 at the top. The drive-side magnetic coupling unit 7 includes a magnet and is connected to a rotation shaft of a motor housed in the drive motor unit 6. In the pump chamber at the bottom of the centrifugal pump body 1, a driven side magnetic coupling portion (not shown) including a magnet for forming a magnetic coupling with the driving side magnetic coupling portion 7 is arranged. The magnet of the drive-side magnetic coupling unit 7 forms an appropriate magnetic coupling with the magnet of the driven-side magnetic coupling unit in a state where the drive motor unit 6 is attached to the motor coupling unit 5 of the housing 2. The centrifugal pump main body 1 is disposed close to the bottom. The driven-side magnetic coupling portion is integrated with the impeller, and when the motor of the drive motor unit 6 rotates, the impeller is rotationally driven via the magnetic coupling. The driven-side magnetic coupling portion may be directly attached to the impeller, or may be provided in a rotating body separate from the impeller, and the rotating body may rotate integrally with the impeller.
[0016]
Although not shown in FIG. 1, when using the above centrifugal pump with cover, the inlet port 3 and the outlet port 4 are connected to blood circuit tubes for connection to the patient. The drive motor unit 6 is connected to a power cord for supplying a drive voltage.
[0017]
A cover 8 is joined to the lower outer peripheral portion of the housing 2 of the centrifugal pump body 1. In FIG. 1, only the cross section of the cover 8 is shown for ease of understanding, but in practice, the cover 8 is joined over the entire circumference of the housing 2 so as to surround the drive motor unit 6. Has been. The cover 8 is joined to the outer peripheral portion of the housing 2 at a position where the region including the inlet port 3 and the outlet port 4 and the region including the portion corresponding to the driven-side magnetic coupling portion are separated from each other. A region including the inlet port 3 and the outlet port 4 excluding the lower portion of the centrifugal pump body 1 is a region to be positioned in the clean field. A region including a portion corresponding to the driven-side magnetic coupling portion is a region to be positioned in the unclean field. The cover 8 is formed in a shape and size that can surround the periphery of the drive motor unit 6.
[0018]
This centrifugal pump with a cover is used after being sterilized in the same manner as a normal centrifugal pump. FIG. 2 shows a state where the centrifugal pump with a cover is used. In FIG. 2, reference numerals 9 and 10 denote blood circuit tubes connected to the inlet port 3 and the outlet port 4, respectively. The tips of blood circuit tubes 9 and 10 are connected to the patient to form a circulation path. A drive motor unit 6 is coupled to the lower part of the centrifugal pump 1. The drive motor unit 6 is connected to a control device 12 by a power cord 11, and the control device 12 is connected to a main power supply 13.
[0019]
The centrifugal pump 1 is disposed in the surgical field in the immediate vicinity of the patient and the practitioner. Therefore, the blood circuit tube can be further shortened, and the amount of priming can be greatly reduced. Along with this, the drive motor unit 6 is also located in the immediate vicinity of the patient, but the lower part of the centrifugal pump 1, the drive motor unit 6 and the power cord 11 are covered with the cover 8, and will be described below. As you can see, the cleanliness of the clean field is not disturbed. That is, as described above, the centrifugal pump 1 and the cover 8 are sterilized prior to use, and the outside of the centrifugal pump 1 and the cover 8 is a clean field that is kept clean. Since the unclean field around the drive motor unit 6 and the power cord 11 is enclosed in the cover 8, it is isolated from the patient and the practitioner. Moreover, although the control apparatus 12 and the main power supply 13 form an unclean field, since it can be arrange | positioned sufficiently away from a patient and a practitioner, it does not cause the contamination with respect to a patient and a practitioner. Alternatively, the control device 12 may be arranged in the vicinity of the practitioner, and the buttons and knobs of the control device 12 on the unclean field side may be operated from the clean field side through the transparent and flexible cover 8. .
[0020]
As described above, according to the centrifugal pump with a cover of the present embodiment, a sufficiently wide clean field can be secured with a simple configuration. Moreover, since it is not necessary to sterilize the drive motor unit, it can cope with an emergency.
[0021]
Further, as described above, since the cover 8 is joined so that the driven-side magnetic coupling portion at the bottom of the centrifugal pump body 1 is disposed on the unclean field side, the drive motor unit 6 is attached to the centrifugal pump body 1. When attaching, an appropriate magnetic coupling can be formed between the driving side magnetic coupling portion 7 and the driven side magnetic coupling portion. On the other hand, if the attachment position of the cover 8 is inappropriate, the cover 8 may prevent proper formation of magnetic coupling. That is, if the cover 8 is interposed between the driving side magnetic coupling portion 7 and the driven side magnetic coupling portion, the magnetic coupling force decreases due to an increase in the magnetic gap or the occurrence of poor positioning accuracy between the two. A situation occurs where the driving force is not sufficiently transmitted.
[0022]
An appropriate joining position of the cover 8 to the outer periphery of the housing 2 will be described with reference to FIGS. 3A and 3B. In addition, the figure is a schematic block diagram which shows only the positional relationship between each element, About the attachment structure of the magnets 14a and 15a etc., it is simplified and is different from an actual structure.
[0023]
In FIG. 3A, the magnet 14a which comprises a driven side magnetic coupling part is shown by the lower part of the centrifugal pump main body 1a. On the upper part of the drive motor unit 6a, a magnet 15a constituting a drive side magnetic coupling portion is shown. A magnet 14a and a magnet 15a face each other to form a magnetic coupling portion. A region 16 indicates a range suitable as a cover joining position. At the top of the region 16, the clean field including the inlet port 3a and the outlet port 4a is located. In the lower part of the region 16, the unclean field including the drive motor unit 6a and the magnetic coupling portion is located. Therefore, if the cover is joined within the region 16, the clean field and the unclean field are isolated. In addition, since the entire magnet 14a faces the unclean field, the magnet 15a can be appropriately opposed to the magnet 14a when the drive motor unit 6a is coupled to the centrifugal pump body 1a.
[0024]
3B, the clean field including the inlet port 3b and the outlet port 4b and the unclean field including the magnetic coupling portion formed by the magnets 14b and 15b and the drive motor unit 6b are also included in the region 17. Proper isolation can be achieved by joining the cover inside.
[0025]
In addition, a method of using a sanitary sheet having an open pump mounting portion and using a centrifugal pump in the opening portion in use without using a centrifugal pump to which a cover is bonded is also conceivable, but has the following disadvantages. For example, there is a possibility that cleanliness inhibition due to a mounting operation mistake or normal magnetic coupling inhibition may occur. Further, in preparation for surgery, it is necessary to fix the seat according to the pump mounting portion of the drive motor unit, which requires care and effort. In the case of the centrifugal pump with a cover according to the present invention, since the cover is provided in a state where it is joined at an appropriate position, those disadvantages are eliminated.
[0026]
More specifically, the cover configuration is as follows.
[0027]
The cover preferably wraps around the drive motor unit, the power cord, or an arm for fixing the drive motor unit, and is preferably large enough to maintain cleanliness.
[0028]
The cover and the centrifugal pump main body can be joined by bonding using an adhesive, welding, or integral molding of parts. When the cover is large, a configuration may be adopted in which elements divided into a plurality of parts are joined.
[0029]
In order to suppress an increase in temperature due to driving of the drive pump unit, the portion surrounding the drive pump unit is preferably made of a material having excellent heat conduction, for example, a metal such as aluminum or stainless steel. The part that wraps the power cord of the drive motor unit or the fixed arm of the unit is transparent so that the internal state can be easily confirmed, and also has a flexible material so that it can easily adapt to the layout change, such as PVC. , PE, PP, PET and the like are preferable.
[0030]
In order to maintain the clean field more reliably, it is preferable that a fixing tool such as a tape or a string is provided on the peripheral edge of the cover.
[0031]
As shown in FIG. 4, in the packaging stage before the cover 8 is attached to the drive pump unit, the upper part of the centrifugal pump 1 (including the inlet port 3, the outlet port 4 and the outer surface of the housing 2) and the operative field side blood. It can be configured to function as a member that wraps the circuit tube 18 and other components of the extracorporeal circulation system, such as an artificial lung and a heat exchanger.
[0032]
【The invention's effect】
According to the present invention, the cleanness can be ensured by surrounding the non-sterile drive motor unit by the cover joined to the centrifugal pump body, and the centrifugal pump body can be disposed in the vicinity of the patient. As a result, the priming amount can be greatly reduced. Further, since the cover is joined so that the magnetic coupling part is included on the side different from the inlet port and the outlet port, the presence of the cover is an obstacle when the drive motor unit is coupled to the centrifugal pump body. Absent. Therefore, the magnetic coupling is appropriately formed, and a sufficient magnetic coupling force can be ensured.
[Brief description of the drawings]
FIG. 1 is a front view partially showing a sectional view of a centrifugal pump with a cover according to an embodiment of the present invention. FIG. 2 is a perspective view showing a state in which the centrifugal pump with a cover of FIG. ] Cross-sectional view for explaining the joint position of the cover to the housing of the centrifugal pump with cover [FIG. 4] Cross-sectional view showing an example of the state of the centrifugal pump with cover of the present invention in the packaging stage [FIG. A perspective view showing a state in which a patient and a centrifugal pump are connected via a blood circuit tube.
1, 1a, 1b Centrifugal pump body 2 Housing 3, 3a, 3b Inlet port 4, 4a, 4b Outlet port 5 Motor coupling part 6, 6a, 6b Drive motor unit 7 Driving side magnetic coupling part 8 Cover 9, 10 Blood circuit tube 11 Power cord 12 Control device 13 Main power supply 14a, 15a Magnet 16, 17 Region 21 Centrifugal pump 22 Inlet port 23 Outlet port 24, 25 Blood circuit tube 26 Drive motor unit 27 Control device 28 Main power source

Claims (5)

A centrifugal pump body having a structure in which an impeller is rotatably supported inside the housing, a magnetic coupling part that transmits rotation to the impeller, and a cover joined to an outer peripheral part of the housing,
The centrifugal pump body is configured such that a drive motor unit can be magnetically coupled to the magnetic coupling portion from the outside of the housing,
The cover includes a region including an inlet port and an outlet port formed in said housing, and a region including a portion corresponding to the magnetic coupling section, which is joined to the outer peripheral portion of said housing at a location isolated from each other ,
The cover is a centrifugal pump with a cover in which a portion close to the drive motor unit is made of a material having higher thermal conductivity than other portions . A centrifugal pump body having a structure in which an impeller is rotatably supported inside the housing, a magnetic coupling part that transmits rotation to the impeller, and a cover joined to an outer peripheral part of the housing,
The centrifugal pump body is configured such that a drive motor unit can be magnetically coupled to the magnetic coupling portion from the outside of the housing,
The cover is joined to an outer peripheral portion of the housing at a position where a region including an inlet port and an outlet port formed in the housing and a region including a portion corresponding to the magnetic coupling portion are separated from each other. ,
In a state before the drive motor unit is mounted, the cover is clean field side and the operative field side blood circuit centrifugal pump with Luke bars have wrapped tube of the centrifugal pump main body. The cover has a size capable of enclosing at least a part of the drive motor unit and a power supply cord in a state where the drive motor unit is mounted so as to be coupled to a magnetic coupling portion of the centrifugal pump body. The centrifugal pump with a cover according to 1 or 2 . The cover, with cover centrifugal pump according to claim 1 or 2 is constructed by integrating by joining a plurality of subelements. The centrifugal pump with a cover according to claim 1 or 2 , wherein a portion of the cover surrounding the power cord of the drive motor unit is made of a transparent and flexible material.

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