JP2000185092A - Perfusion suction device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inhibit pulsations caused by a peristaltic pump and to achieve quick startup of suction and a stable suction flow rate. SOLUTION: In this perfusion suction device in which waste liquid from the part for a surgical operation is sucked and discharged by a peristaltic suction pump 8 via a surgical instrument connected with a flexible suction tube 6, a capacity variation means for making the capacity within the suction tube 6 variable in accordance with the running movement of a roller caused by the suction pump 8 is provided on the surgical instrument side of the suction pump 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a perfusion suction device for supplying a perfusion solution to a surgical site and suctioning the perfusion solution together with a tissue to be removed. Regarding the mechanism.

[0002]

2. Description of the Related Art There is known a perfusion suction device which supplies a perfusate to an affected part and aspirates and removes the removed tissue of the affected part together with the perfusate. For example, in the field of ophthalmology, it is used in cataract surgery, vitreous surgery, and the like.

[0003] The perfusion suction device used in these operations is provided with a handpiece for suctioning the removed tissue together with the perfusate from the inside of the patient's eye, and the removed tissue is attached to the suction piece provided at the tip of the handpiece. The liquid passes through the tube from the hole and is discharged to the waste liquid bag via the suction pump. Generally, a peristaltic pump (peristaltic pump) is used as a suction pump for sucking and removing the removed tissue.

In a peristaltic pump, a plurality of pump rollers 52 disposed on the same circumference of the rotating table 51 are rotated by rotating the rotating table 51 as shown in FIG. It runs while crushing the suction tube 54 arranged between the receivers 53. As a result, the fluid in the suction tube 54 is pushed out in the running direction of the pump roller 52, and a suction pressure is generated.

[0005]

However, in such a peristaltic pump, when the pump roller 52 starts to crush the suction tube 54, a part of the fluid in the suction tube 54 flows backward. Thereafter, when the tube is restored by the elastic force, the flow velocity in the traveling direction becomes faster (the flow rate per unit time increases). Since such an operation is repeatedly performed, the suction volume fluctuates, and a periodic fluctuation of the suction pressure called pulsation as shown in FIG. 5B occurs. This pulsation may cause pressure fluctuations in the eye to be operated or make it difficult to accurately control the suction pressure and the suction flow rate.

In order to cope with this pulsation, an air chamber or the like communicating with the suction tube is provided on the handpiece side of the suction pump so as to absorb fluctuations in the suction pressure. As the air in the air chamber expands and contracts, it responds to the operation of increasing the suction pressure, and as a result, there is a problem that the rise of the suction pressure is delayed.

Furthermore, in the crushing and emulsifying removal of the lens nucleus in cataract surgery, when the suction hole at the tip of the crushing tip is closed by the lens nucleus, the suction pressure in the tube increases,
A sharp aspiration occurs when the nucleus is removed. At this time, if the air chamber is provided, the air expands in response to the increase in the suction pressure, so that when the nucleus is removed, a more rapid suction occurs with the contraction of the air, and the supply of the perfusate is performed. May be delayed, and an anterior chamber volume fluctuation accompanying a temporary decrease in anterior chamber pressure may occur.

The present invention has been made in view of the above-mentioned problems in the prior art, and has as its technical object to provide a perfusion suction device which can suppress pulsation generated by a peristaltic pump and can obtain a quick rise of suction and a stable suction flow rate. And

[0009]

Means for Solving the Problems In order to solve the above problems, the present invention is characterized by having the following configuration.

(1) In a perfusion suction device for suctioning and discharging waste liquid from a surgical site through a surgical instrument to which a flexible suction tube is connected, a suction pressure is generated by a roller running while crushing the suction tube. A peristaltic suction pump to be operated, a volume changing means provided on the surgical instrument side of the suction pump to change a volume in the suction tube, and a volume changing means interlocked with a running operation of a roller by the suction pump. And control means for controlling driving.

(2) In the perfusion suction device of (1),
The control means drives the volume variable means so as to generate a pressure fluctuation which cancels a suction pressure fluctuation generated by the suction pump.

(3) In the perfusion suction device of (1),
The volume variable means is means for changing the cross-sectional area of the flow path by deforming the suction tube, and the minimum cross-sectional area of the flow path when the suction tube is deformed is the flow rate crushed by the roller of the suction pump. It is characterized by being larger than the minimum sectional area of the road.

(4) In the perfusion suction device of (1),
The variable volume means has a roller rotating means for rotating a rotating disk having a rotatable roller to change the compression of the suction tube, or a pressing means for moving a pressing member for pressing the suction tube forward and backward with respect to the suction tube. It is characterized by the following.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a perfusion suction device used in cataract surgery according to the present invention. FIG. 1 is a schematic diagram of a perfusion suction device according to an embodiment.

A perfusion bottle 1 filled with perfusion solution is suspended from a perfusion pole 2. The perfusion pole 2 is the input unit 11
Is moved up and down by the vertical drive unit 12 in accordance with the pole height set in the above. The height of the perfusion bottle 1 is changed by the vertical movement of the perfusion pole 2, and the perfusion pressure is adjusted.

The perfusate from the perfusion bottle 1 is supplied to the perfusion tube 3
And is irrigated into the patient's eye E via the surgical handpiece 5 gripped by the operator. A control valve 4 is provided in the middle of the perfusion tube, and opening and closing of the control valve 4 controls outflow of the perfusate. In the present embodiment, a US handpiece is used as the surgical handpiece 5, which emulsifies and removes the hardened lens nucleus that has become opaque due to cataract and is hardened by ultrasonic vibration of the crushing tip 5a provided at the tip. The ultrasonic vibration of the crushing tip 5a is applied to the handpiece 5
Power is supplied to the ultrasonic transducer provided therein through the power cable 13.

A flexible suction tube 6 is connected to the handpiece 5, a connecting portion 16 connected to a pressure sensor 15, and a flow rate control for controlling a suction flow rate by changing a cross-sectional area of the suction tube 6. A part 7 and a peristaltic suction pump 8 are provided. The suction tube 6 communicates with the perfusion tube 3 via the bypass tube 17, and the outflow control of the bypass tube 17 is performed by the control valve 18. The pressure sensor 15 always detects the suction pressure, and when the suction pressure rises above a set value, the control unit 10
The control valve 18 is opened by the control described above, and the perfusion solution flows from the perfusion tube 3 into the suction tube 6 via the bypass tube 17 to lower the suction pressure. Upper limit of suction pressure is input unit 1
1 is set by operating the switch.

Next, the schematic configuration of the peristaltic suction pump 8 and the flow rate control unit 7 will be described based on the schematic configuration diagram of FIG.

The suction pump 8 includes a turntable 20 and a turntable 20.
And four tube rollers 22 rotatably arranged on the same circumference. The tube receiver 22 can be moved up and down by operating a lever 23, so that the suction tube 6 can be easily arranged between the suction pump 8 and the tube receiver 22.

When the rotary table 20 rotates, the four pump rollers 21 travel while sequentially crushing the suction tube 6, thereby transferring the fluid in the suction tube 6 and applying a suction pressure. The perfusate and the removed tissue are sucked through suction holes provided in the crushing tip 5 a of the handpiece 5 and discharged into the waste liquid bag 9. The control unit 10 receives a signal indicating the position of the depressed position of the foot switch 14 and the input device 11.
By controlling the rotation of the turntable 20 on the basis of the set value, the suction is controlled.

A flow velocity control unit 7 is provided immediately before the handpiece 5 to the suction pump 8. The flow velocity control unit 7 includes a turntable 30, four compression rollers 31, and a tube receiver 32.
Consists of The tube receiver 32 is also a tube receiver 2
2, the suction tube 6 is moved up and down by the lever 33.
Are configured to be easily arranged.

The pump roller 21 of the suction pump 8 generates suction pressure by running while completely crushing the suction tube 6, while the compression roller 31 generates the suction pressure.
Is deformed to such an extent that it is not completely crushed.
Is provided so as to play a role in changing the flow path cross-sectional area (the volume of the suction tube 6).

When the back flow (back pressure) is generated by the pump roller 21 on the suction pump 8 side, the flow velocity control section 7 increases the flow path (normal flow path diameter) and controls the collapsed tube 6. The driving of the compression roller 31 is controlled so that the compression roller 31 is driven in conjunction with the movement of the pump roller 21 of the suction pump 8 so that the flow path becomes narrower when the flow rate in the suction direction is increased by returning to the original state by the elastic force. Is done. That is, as shown in FIG. 2, when the pump roller 21 reaches the position A and completely crushes the suction tube 6, the deformation of the suction tube 6 by the compression roller 31 is opened, and the pump 20 is rotated by the rotation of the turntable 20. When the roller 21 separates from the position A and the next pump roller 21 starts to crush the suction tube 6, the turntable 30 is rotated so that the deformation of the suction tube 6 by the compression roller 31 is maximized.

FIG. 3 is a diagram schematically showing the time-series change of the suction pressure in the suction tube by such a flow rate control unit 7 (showing the rise of the suction pressure). In the drawing, C _A indicates a change curve of the suction pressure generated by the suction pump 8, and C _A
F indicates a pressure change curve generated by the flow velocity control unit 7.

The suction pressure in the suction tube by the suction pump 8 is generated when the pump roller 21 reaches the position A and rotates. When the next pump roller 21 starts to crush the suction tube 6, a part of the fluid flows backward, so that the pressure becomes a back pressure and the pressure decreases. After the pump roller 21 reaches the position A, the pressure starts to increase. Against the suction pressure change curve C _A varying Thus, the pressure caused by the flow rate control unit 7 side, the variation period is changed as and phase identical is reversed. Therefore, the pressure change in the tube synthesized by the pressure change curves C _A and C _F is as shown by the curve C _T , the pressure fluctuation width is smaller than C _A , and pulsation is suppressed.

[0026] drives the flow rate control section 7 so as to cancel the pressure change C _A generated by the suction pump 8 in this way,
By generating a pressure change C _F, can pulsation causes interference pressure change C _A and C _F can be suppressed. By suppressing the pulsation, pressure fluctuations applied to the anterior chamber of the patient's eye can be suppressed, and stable suction pressure and suction flow can be accurately controlled.

The curve C _AIR in the figure shows the state of a pressure change when an air chamber is provided in front of the suction pump 8, and the provision of the air chamber can suppress the fluctuation of the suction pressure. Since the air in the air chamber expands / contracts in response to the suction pressure, its rise is delayed. On the other hand, the pulsation damping by the flow velocity control unit 7 has a large increase in suction pressure per time, so that the time required to reach a desired set suction pressure is short. Thus, a smooth operation can be performed by obtaining a quick rise of the suction pressure.

Furthermore, since a highly inflatable gas such as an air chamber is not used, the suction hole at the tip of the crushing tip is closed by the lens nucleus, and the transient suction caused by rapid suction after the suction is removed. It is possible to reduce the fluctuation of the chamber pressure.

In the above description, the flow rate control is based on the roller driven in conjunction with the suction pump. However, the same effect can be achieved by another configuration. For example, a modification example of the flow velocity control unit will be described with reference to FIG.

The flow rate control unit 40 includes the tube pressing head 4
1, a guide shaft 42, a spring 43, a cam 44, a spring receiver 45, a cam receiver 46, a tube receiver 47, and a lever 48. The spring receiver 45 is fixed to the apparatus main body, and the cam receiver 46 is fixed to the guide shaft 42. The guide shaft 42 passes through a hole (not shown) of the spring receiver 45. The tube pressing head 41 has the guide shaft 4
2. It moves up and down with the movement of the cam 44 together with the cam receiver 46 (moves forward and backward with respect to the suction tube). The tube receiver 46 and the lever 47 are configured to be able to move up and down in the same manner as described above, so that the tube can be easily arranged.

The flow velocity control unit 40 having such a configuration is
As similar pressure fluctuations and pressure change curve C _F described above is caused by driving in conjunction with cam 44 and the traveling rollers of the suction pump 8, to obtain the same effect as the flow velocity control unit 7 of the above Can be.

[0032]

As described above, according to the present invention, the pulsation generated by the peristaltic pump is suppressed, and the suction can be quickly started.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a perfusion suction device according to an embodiment.

FIG. 2 is a schematic configuration diagram of a peristaltic suction pump and a flow rate control unit.

FIG. 3 is a diagram schematically showing a time-series change of a suction pressure in a suction tube.

FIG. 4 is a schematic configuration diagram of a modified example of a peristaltic suction pump and a flow rate control unit.

FIG. 5 is an explanatory view of a conventional peristaltic suction pump.

[Explanation of symbols]

 5 Surgery Handpiece 6 Suction Tube 7 Flow Rate Control Unit 8 Suction Pump 10 Control Unit 21 Pump Roller 30 Rotating Plate 31 Compression Roller 40 Flow Rate Control Unit 41 Tube Press Head 44 Cam

Claims (4)

[Claims] In a perfusion suction device for sucking and discharging waste fluid from a surgical site through a surgical instrument to which a flexible suction tube is connected, a suction pressure is generated by a roller running while crushing the suction tube. A peristaltic suction pump, a volume changing means provided on the surgical instrument side of the suction pump for changing a volume in the suction tube, and a drive of the volume changing means in conjunction with a running operation of a roller by the suction pump. Perfusion suction device, comprising: 2. The perfusion apparatus according to claim 1, wherein said control means drives said variable volume means so as to generate a pressure fluctuation which cancels a suction pressure fluctuation generated by said suction pump. Suction device. 3. The perfusion suction device according to claim 1, wherein the volume changing means is means for changing a cross-sectional area of the suction tube by deforming the suction tube, and reducing a flow path when the suction tube is deformed. A perfusion suction device, wherein a cross-sectional area is larger than a minimum cross-sectional area of a flow path crushed by a roller of the suction pump. 4. The perfusion suction device according to claim 1, wherein the volume changing means rotates a rotary disk having a rotatable roller to change the squeezing of the suction tube, or presses the suction tube. A perfusion suction device comprising a pressing means for moving a member forward and backward with respect to a suction tube.