JPH0318711Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a liquid pump used in an extracorporeal circulation circuit for blood in an artificial lung or an artificial heart, or in the continuous administration of a medicinal solution.

[Conventional technology]

Conventionally, there are, for example, pumps for liquids generally used as shown in FIGS. 8 to 12. Fig. 8 is a perspective view showing the entire conventional liquid pump, Fig. 9 is a front view of the liquid pump, Fig. 10 is a plan view showing the state with the lid removed, and Fig. 11 is the same as Fig. 10. A sectional view corresponding to the line XI-XI, and FIG. 12 is a sectional view relating to the XII section of FIG. 11 and showing a state in which the tube has fallen off from the roller.

This liquid pump 10 includes a pump main body 11 having a substantially rectangular parallelepiped shape and having an opening on its upper surface. A drive shaft 12 is disposed at the center of the pump body 11 . This drive shaft 12 is connected to a motor (not shown) via a speed reducer, and is rotatable in the direction of arrow A by the drive of the motor. Here, the reducer is disposed within a reducer case 13 below the pump body 11, and the motor is disposed within a motor case 14 below the reducer case 13. A roller holder 15 is attached to a drive shaft 12 that is rotationally driven in the direction of arrow A. The roller holder 15 has a circular planar shape, and the drive shaft 12
is rotated in the direction of arrow A. The rotating roller holder 15 is provided with an upper support plate 16 and a lower support plate 17, as shown in FIG.
A roller shaft 18 is provided between the upper and lower support plates 16 and 17.
A and 18B are provided, and the upper and lower ends of each roller shaft 18A and 18B are fixed to corresponding support plates 16 and 17, respectively. The two roller shafts 18A, 18B are arranged at opposing positions with the drive shaft 12 at the center, as shown in FIG.
A roller 19 serving as a pressing means is rotatably supported on each of the two roller shafts 18A and 18B.

A guide wall 20 is formed on the upper surface of the pump body 11, and includes two curved wall surfaces 20A and 20B that are perpendicular to each other. This guide wall 2
0 extends along the circumference of the roller holder 15, and the guide wall 20 is shown in the front view of the pump body 11.
An artificial part 21 and an outlet part 22 are respectively formed. A tube 23 for feeding liquid such as blood is attached to the curved guide wall 20.
It is possible to attach it by inserting it inside. 8th
In the figure, a tube 2 attached to a guide wall 20
Reference numeral 3 constitutes a part of an extracorporeal circulation circuit for blood in an artificial lung, and the tubes 23 are arranged in such a way that a puncture needle is attached to the upstream side and an artificial lung device or the like is attached to the downstream side. Furthermore, an opening/closing lid 24 is disposed on the upper surface of the pump body 11 to allow the surface to be opened and closed. The opening/closing lid 24 is supported by the pump body 11 via a hinge member 25, and can be opened and closed with respect to the pump body 11 in the direction of arrow B.

The liquid pump 10 constructed in this manner is operated with the tube 23 attached to the guide wall 20 and the opening/closing lid 24 closed so that the tube 23 is supported within the guide wall 20. The liquid pump 10 is operated by rotating the roller holder 15. That is, when the roller holder 15 is continuously rotated in the direction of arrow A, the roller 19 as a pressing means provided in the holder 15 is sequentially moved to the tube pressing/closing support portion provided on a portion of one wall surface 20A of the guide wall 20. It rotates while pressing the tube 23 attached to the tube 26. That is, when the roller 19 rotates in the direction of arrow C and the tube 23 is pressed between the roller 19 and the curved tube pressing/closing support part 26, the tube 2
The blood in 3 is pumped from the upstream side to the downstream side in the direction of arrow D. As a result, the liquid pump 10, which forms part of the extracorporeal blood circulation circuit, can circulate blood under pressure.

[Problem that the invention attempts to solve]

However, in the liquid pump 10 configured as described above, since the tube 23 attached to the guide wall 20 is not reliably positioned within the guide wall 20, There was a risk that the tube 23 would move in the vertical direction (in the direction of arrow E in FIG. 11). In this way,
When the tube 23 moved up and down, there was a risk that the tube 23 would separate from the roller 19 as shown in FIG. In addition, if the tube 23 is used without being inserted securely into the guide wall 20, the tube 23 may be pinched by the closed opening/closing lid 24, or the roller 19 may not be able to securely close the tube 23, causing blood, etc. It was assumed that the liquid could not circulate smoothly. In addition, the roller holder 15 to be rotated
There was also a fear that the tube 23 could be damaged or damaged.

Further, when the liquid pump 10 is continuously operated in a state where the tube 23 is not securely positioned within the guide wall 20, the roller holder 15
Due to the rotation of the tube 23, the tube 23 is sandwiched between the roller 19 and the tube press-closing support part 26, and the tube 2
There was a problem that the feeder 3 moved little by little in the direction of arrow D. If such a feeding movement phenomenon of the tube 23 occurs, the upstream side of the tube 23 will be pulled in the direction of the arrow F, which may impede the blood collection operation or affect the state of connection between each device and the tube 23. It was hot.

[Purpose of invention]

The object of the present invention is to securely position the tube at the tube pressure-closing level within the guide wall and close the tube using rollers, thereby achieving a smooth liquid pumping state.

[Means to solve the problem]

The present invention includes a pump body to which a tube for liquid supply can be attached, and a tube guide wall consisting of two walls at right angles to each other, and a tube installed on a revolving body and attached to the guide wall. A part of the guide wall is pressed against the tube pressure-closing support part on one wall surface, and the tube pressing position is sequentially moved in the same direction along the tube pressure-closing support part on the one wall surface to drain the liquid in the tube. In a liquid pump comprising a pressure-feeding roller and a lid capable of covering the guide wall and the roller with the tube attached, when the lid is placed on the pump body, the guide wall The lid includes a protrusion that presses the tube against the other wall surface of the guide wall at least at the upstream end of the tube and regulates the position of the tube to a tube pressure-closing level corresponding to the tube pressure-closing support part. , and the upper and lower retaining plates, which are arranged to protrude outward in the radial direction of the roller in the vicinity of the tube pressing area of the roller, are rotated so as to maintain the tube attached to the guide wall at the tube pressing level. It is meant to prepare the body.

[Effect]

According to the present invention, there are the following effects.

By covering the pump body with the lid, the protrusion of the lid allows the tube to be positioned at the tube pressure-closing level within the guide wall.

Then, the upper and lower holding plates, which move with the rotation of the revolving body, press the roller while stably maintaining the tube, which has already been positioned at the tube pressure-closing level by the protruding portion, at the tube pressure-closing level. Guide to the area.

According to the above, the tube is reliably positioned at the tube pressure-closing level within the guide wall while being pressure-closed by the roller, and a smooth fluid pumping state can be obtained.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing the entire liquid pump according to an embodiment of the present invention, FIG. 2 is a front view of the liquid pump, FIG. 3 is a plan view showing the state with the opening/closing lid removed, and FIG. 4 is a sectional view taken along the - line in FIG. 3, and FIG. 5 is a sectional view taken along the - line in FIG. 3.

The liquid pump 40 includes a pump main body 41 having a substantially rectangular parallelepiped shape and having an opening on its upper surface. A drive shaft 42 is disposed at a lower position inside the pump body 41, as shown in FIG. This drive shaft 42 is connected to a motor (not shown) via a speed reducer. As a result, the drive shaft 4
2 can be rotated in the direction of arrow G. Here, the reducer is a reducer case 43 located below the pump body 41.
The motor is arranged in a motor case 44 below the reducer case 43.

A roller pump 45 serving as a revolving body is attached above a drive shaft 42 that is rotated in the direction of arrow G by the drive of a motor. The roller pump 45 includes a cylindrical portion 46 on the lower side, and a plurality of holder bearings 47 are disposed between the outer side of the cylindrical portion 46 and the inner side of the pump body 41. The roller pump 45 supported by the drive shaft 42 is rotatable in the direction of arrow G by rotation of the drive shaft 42 . At this time, the roller pump 45 has a cylindrical portion 4 of a predetermined length extending downward.
6 is supported by each holder bearing 47, the lateral vibration caused by the rotation of the holder 45 can be minimized. At the top of the roller pump 45,
Two rollers 48A and 48 as pressing means
B are arranged respectively. The rollers 48A and 48B are disposed at opposite positions with the rotation center O of the drive shaft 42 interposed therebetween (see FIG. 3). Each of the rollers 48A and 48B is provided with a support shaft 49 supported and fixed to the roller pump 45 at the center. Furthermore, a bearing support body 50 is supported on the outside of the support shaft 49, and a plurality of roller bearings 51 are supported on the support body 50. A roller drum 52 is supported on the outside of the roller bearing 51. The roller drum 52 is rotatable in the direction of arrow H with respect to the bearing support 50 due to the presence of the roller bearing 51 interposed therebetween. Below each roller 48A and 48B and above the roller pump 45, a lower holding plate 53 is disposed so as to protrude outward in the radial direction of the rollers 48A and 48B in the vicinity of the tube pressing area of the rollers 48A and 48B. Ru. The lower holding plate 53 is formed of a ring-shaped member that is fitted and supported on the upper circumferential portion of the roller pump 45 . On the other hand, an upper holding plate 54 is provided above each roller 48A and 48B.
are disposed protruding radially outward from the rollers 48A, 48B in the vicinity of the tube pressing areas of the rollers 48A, 48B. The upper holding plate 54 is the fifth
As shown in the figure, it is supported on the upper part of a support column 55, and the support column 55 is erected on the upper surface of the roller pump 45. Upper holding plate 54 for support column 55
This support is achieved by fixing the upper holding plate 54 to the support column 55 using screws 56. Upper holding plate 54
Two notches 57A and 57B are provided at two locations in the circumferential direction (direction of arrow J in FIG. 3), respectively. These notches 57A and 57B are for inserting a tube, which will be described later.
A and 57B are arranged at opposing positions with the center of rotation of the drive shaft 42 interposed therebetween (see FIG. 3).

A guide wall 58 is formed on the upper surface of the pump body 41 and is curved and consists of two wall surfaces 58A and 58B that are perpendicular to each other. This guide wall 58 extends along the circumference of the roller holder 45, and the guide wall 58 is provided on the front side of the pump body 41.
An inlet portion 59 and an outlet portion 60 are respectively formed. A tube 61 for feeding liquid such as blood can be attached to the curved guide wall 58 so as to be inserted into the guide wall 58 . In the embodiment, a tube 61 attached within the guide wall 58
constitutes a part of the extracorporeal blood circulation circuit in the artificial lung. That is, as shown by the two-dot chain line in FIG.
is attached. In addition, an artificial lung device 6 is provided on the downstream side.
3 is attached.

To attach the tube 61 to the guide wall 58, first, the intermediate portion of the tube 61 is sequentially inserted from the entrance portion 59. The tube 61 is inserted through the front U-shaped entrance portion 59 as shown in FIG.
The tube 61 is placed along the guide wall 58 of the tube 61. When inserting the tube 61 into the planar curved guide wall 58, the tube 61 is inserted into the notch 57A or 57 as shown by the two-dot chain line in FIG.
This is done by pushing in from part B. When inserting the tube 61 from the notch 57A or 57B as shown in FIG.
6 is rotated in the direction of arrow G using a finger or the like. As a result, the tube 61 is gradually inserted from the inlet part 59 of the curved guide wall 58 toward the outlet part 60,
It will be attached.

The tube 61 attached within the guide wall 58 in this manner is positioned opposite the roller drum 52 of each roller 48A and 48B. Further, a tube 6 attached within the guide wall 58
1, a ring-shaped lower holding plate 53 is located in the lower part. Furthermore, an upper holding plate 5 is provided on the upper part of the tube 61 so as to cover the tube 61.
4 covering portions 63 will be located. (5th
(see figure). The covering portions 63 are arranged at four positions on the circumference of the upper holding plate 54.

On the upper surface of the pump body 41 to which the tube 61 is attached, there is an opening/closing lid 64 that allows the surface to be opened and closed.
will be placed. The opening/closing lid 64 is supported by the pump body 41 via a hinge member 65.
1, it can be opened and closed in the direction of arrow K. Two protrusions 66A and 66B are formed on the inner surface of the opening/closing lid 64. Among these, the protrusion 66A is
The protruding portion 66B is formed at a position opposite to the inlet portion 59 on the guide wall 58, and the protrusion portion 66B is formed at a position opposite to the outlet portion 60 on the guide wall 58. That is, each protrusion 66A and 66B
When placed over the top of the pump main body 41, it comes into contact with a tube 61 attached within the guide wall 58, making it possible to hold and position the tube 61 within the guide wall 58. Of these, the protrusion 66A
Presses the upstream tube 61 attached to the inlet portion 59 side against the other wall surface 58B of the guide wall 58,
The tube 61 can be held and positioned on the guide wall 58. On the other hand, the protruding portion 66B
The downstream tube 61 attached to the guide wall 5
8, the tube 61 can be held and positioned on the guide wall 58. That is, the protrusions 66A and 66B are connected to the tube 61.
The position of the guide wall 58 is regulated to a tube pressure-closing level corresponding to the tube pressure-closing support portion 67 on one wall surface 58A of the guide wall 58. Here, the amount of protrusion of each of the protrusions 66A and 66B is set to such an extent that the tube 61 is not obstructed and the flow state of the liquid within the tube 61 is not obstructed. The portions of the protrusions 66A and 66B that are pressed against the tube 61 are rounded as shown in FIG.

Further, the lower holding plate 53 and the upper holding plate 54 maintain the tube 61 attached to the guide wall 58 at the tube pressure-closing level.

In the above embodiment, the shape of the guide wall 58 at the inlet section 59 and the outlet section 60 is U-shaped from the front as shown in FIG. However, instead of the guide wall 58 having such a shape, the sixth
As shown in Figure A, the diameter of the tube 61 is
The width W2 is smaller than W1, and the width inside the guide wall is W1.
Alternatively, the tube 61 inserted into the guide wall 58 may be reliably positioned within the guide wall 58. In addition, as shown in FIG. 6B, the guide wall 5
8 may be made as small as W2 so that the tube 61 is reliably positioned within the guide wall 58. At this time, the tube 61 inside the guide wall 58
is reliably held on the inlet section 59 and outlet section 60 sides, and the phenomenon of feeding and moving the tube 61 to the upstream side is eliminated.

[Effect of the embodiment]

Next, the operation of the above embodiment will be explained.

FIG. 7 shows a liquid pump 40 according to the above embodiment.
This is an extracorporeal circulation circuit for an artificial lung formed using This extracorporeal circulation circuit is capable of pumping blood collected from the human body with a puncture needle 62 in the direction of arrow L through the operation of the liquid pump 40. The liquid pump 40 is operated by rotating the roller holder 45. That is, when the roller holder 45 is continuously rotated in the direction of arrow G by the drive of the motor, each of the rollers 48A and 48B serving as a pressing means provided in the holder 45 sequentially presses against the guide wall 58.
Among them, a tube 61 attached to a tube press-closing support part 67 provided in a part of one wall surface 58A.
It will rotate while pressing. As a result, the roller drum 52 of each roller 48A and 48B rotates in the direction of arrow M, presses the tube 61, and pumps the blood in the tube 61 from the upstream side to the downstream side in the direction of arrow L. . Blood pumped by the operation of the liquid pump 40 is supplied to an artificial lung device 63, and the device 63 enables gas exchange with the supplied blood. The gas-exchanged blood is then supplied to a blood heat exchanger 68 via a tube 61. The heat exchanger 68 raises the supplied blood to a predetermined temperature so that it can be reheated. The blood thus rewarmed by the heat exchanger 68 is further pumped in the direction of arrow L,
It will be supplied to the human body.

In this way, the liquid pump 60 used
In this case, the tube 61 can be reliably held and positioned within the guide wall 58 simply by attaching the tube 61 within the guide wall 58 and covering it with the opening/closing lid 64. That is, the closed lid 64
The protrusions 66A and 66B provided in the guide wall 58 reliably hold the upstream and downstream sides of the tube 61, so that the tube 61 in the guide wall 58 can be moved upstream as in the conventional case, or the tube 23 can be moved upstream. Problems such as separation of the rollers 48A and 48B from the rollers 48A and 48B are eliminated. Therefore, it is possible to reliably position the tube 61 within the guide wall 58 and achieve smooth blood pumping. Furthermore, a tube 61 within the guide wall 58
is the covering portion 6 of the lower holding plate 53 and the upper holding plate 54.
3, the tube 61 can be reliably pressed and closed by the rollers 48A and 48B as pressing means.

[Effect of idea]

As described above, according to the present invention, the tube is reliably positioned at the tube pressure-closing level within the guide wall while being pressure-closed by the rollers, and a smooth fluid pumping state can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the entire liquid pump according to an embodiment of the present invention, FIG. 2 is a front view of the liquid pump, FIG. 3 is a plan view showing the state with the opening/closing lid removed, and FIG. Figure 4 is a sectional view taken along the - line in Figure 3, Figure 5 is a sectional view taken along the - line in Figure 3, and Figure 6 A.
and B are front views showing modified examples of the guide wall, respectively, and FIG. 7 is a perspective view showing an extracorporeal circulation circuit of an artificial lung formed using the liquid pump shown in FIG. 1. Furthermore, FIG. 8 is a perspective view showing the entire conventional liquid pump, and FIG. 9 is a front view of the liquid pump.
Figure 10 is a plan view showing the state with the opening/closing lid removed;
11 is a cross-sectional view corresponding to the line XI--XI in FIG. 10, and FIG. 12 is a cross-sectional view corresponding to the XII section in FIG. 11, showing a state in which the tube has fallen off the roller. 40...Liquid pump, 41...Pump body,
48A, 48B...roller [pressing means], 58...
...Guidance wall, 58A, 58B...Wall surface, 61...Tube, 64...Opening/closing lid [lid], 66A, 66B
... Protrusion, 53, 54 ... Holding plate.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A pump body which can be attached with a tube for liquid feeding and has a tube guide wall consisting of two walls at right angles to each other, and a pump body which is disposed on a revolving body and which A part of the tube attached to the guide wall is pressed against the tube press-closing support part on one wall of the guide wall, and the tube press position is sequentially moved in the same direction along the tube press-close support part on the one wall. A liquid pump comprising: a roller that moves and pressure-feeds the liquid in the tube; and a lid that covers the guide wall and the roller with the tube attached; When the tube is covered, at least the upstream end of the guide wall is pressed against the other wall surface of the guide wall without blocking the tube, and the tube is positioned at a tube pressure-closing level corresponding to the tube pressure-closing support part. The lid is provided with a protruding portion that protrudes outward in the radial direction of the roller in the vicinity of the tube pressing area of the roller so as to maintain the tube attached to the guide wall at the tube pressing level. A liquid pump characterized in that the revolving body is provided with upper and lower holding plates. (2) The liquid pump according to claim 1, wherein the portion of the protrusion that is pressed against the tube is rounded.