JP2021010638A - Stand device for medical optical equipment - Google Patents

Abstract

To provide a stand device for medical optical equipment of which overall weight can be reduced.SOLUTION: For at least one of the connection parts a-d of a parallel linkage L, a spiral spring 14 is installed which provides moment of rotation to a second rotation direction B relating to counter weight W. Accordingly, the weight of the counter weight can be made lighter for that portion, and the overall weight of the stand device 1 can be reduced. Because of the structure of merely installing the spiral spring 14, there is no need of changing the design of the stand device larger, which is also advantageous in cost.SELECTED DRAWING: Figure 2

Description

The present invention relates to a stand device for medical optical equipment.

In neurosurgery and the like, medical optical instruments such as operating microscopes and cameras are used to magnify the surgical site. Such medical optics are supported above the surgical site by a stand device. The stand device has a structure in which a part of the parallel link mechanism is rotatably supported on the stand body installed on the floor. A heavy medical optical device is supported at the front end of the upper arm extending forward from the upper end of the parallel link mechanism, and conversely, at the rear end of the lower arm extending rearward from the lower end of the parallel link mechanism. It supports the counterweight and balances the weight of medical optical equipment. Therefore, no matter what position the medical optical device is moved to in the air by deforming the parallel link mechanism, the state of the parallel link mechanism is maintained by the counter weight, and the medical optical device is moved to the position where it was moved. It stops and does not move (see, for example, Patent Document 1).

Japanese Patent No. 4122095

In such a conventional technique, the heavier the weight of the medical optical device, the heavier the counterweight for weight balance is required. Therefore, when supporting a heavy medical optical device, the counterweight becomes heavier by that amount, and the total weight of the entire stand device increases. When the total weight of the stand device is increased, it is very difficult for an assistant or the like to push the stand device on the floor of the hospital by the casters provided on the base of the stand device.

The present invention has been made focusing on such a conventional technique, and an object of the present invention is to provide a stand device for a medical optical device capable of reducing the total weight.

According to the first technical aspect of the present invention, the stand body installed on the floor includes two parallel front and rear arms and two parallel upper and lower arms, respectively. A parallel link mechanism in which the connecting portion of the arm is rotatably supported is mounted rotatably around a rotation axis set in the middle of the front arm, and the upper arm is extended forward beyond the parallel link mechanism. A medical optical device is supported at the front end thereof, the lower arm is extended rearward beyond the parallel link mechanism, and a counter weight is supported at the rear end portion, and the first rotation direction in the direction in which the medical optical device is lowered. , A stand device for medical optical equipment in which the state of the parallel link mechanism is maintained without rotating each connecting portion by the balance of each rotational moment in the second rotational direction in the direction in which the counter weight is lowered. At least one of the connecting portions in the link mechanism is provided with a spiral spring that applies a rotational moment in the second rotational direction related to the counter weight.

According to the second technical aspect of the present invention, the front arm is formed wider than the rear arm, and the spiral spring is provided at the connecting portion of the upper end and / or the lower end of the front arm in the parallel link mechanism. To do.

According to the first technical aspect of the present invention, at least one of the connecting portions of the parallel link mechanism is provided with a spiral spring that imparts a rotational moment in the second rotational direction related to the counterweight. By that amount, the weight of the counterweight can be reduced, and the total weight of the stand device can be reduced. Since the structure is only provided with a spiral spring, it is not necessary to significantly change the design of the stand device, the appearance quality of the stand device can be maintained, and a large-scale structure is not required, which is advantageous in terms of cost.

According to the second technical aspect of the present invention, in order to provide the spiral spring at the connecting portion of the upper end and / or the lower end of the wide front arm, a larger spiral spring is adopted to generate a large rotational moment. It can be applied in two rotation directions. Therefore, the counterweight can be made lighter by that amount.

The perspective view which shows the stand device of the medical optical device. A side view showing a stand device of a medical optical device. FIG. 5 is a cross-sectional view showing a connecting portion provided with a spiral spring. The figure which shows the spiral spring.

A preferred embodiment of the present invention will be described with reference to FIGS. In the above and below, the front-back and left-right directions are as shown in FIG.

The stand device 1 has a structure in which a stand body 4 that is rotatable in the horizontal direction is mounted on a base 3 having casters 2 at four corners. A parallel link mechanism L having a structure in which the front arm 5 and the rear arm 6 and the upper arm 7 and the lower arm 8 are rotatably supported by connecting portions a to d at four points is attached to the stand body 4. Has been done. The parallel link mechanism L is attached so that the entire rotation shaft 9 set in the middle of the front arm 5 is rotatable with respect to the stand body 4. Since the front arm 5 includes the rotating shaft 9, it is formed of a wide hollow structure by casting in order to increase the rigidity.

The upper arm 7 extends forward beyond the parallel link mechanism L, and a surgical microscope 11 as a "medical optical instrument" is supported at its front end via a hanging arm 10. The lower arm 8 extends rearward beyond the parallel link mechanism L, and a counterweight W is supported at its rear end.

The counterweight W is provided to balance the weight with the surgical microscope 11. The counterweight W is movable in the longitudinal direction of the lower arm 8 by a motor, and receives an input from a balance sensor (not shown) provided at the connecting portion c between the front arm 5 and the lower arm 8, and the connecting portions a to In d, it moves to the optimum position so that the rotational moment of each link side does not occur. Therefore, even if an auxiliary device such as an assistant mirror or a camera is added to the operating microscope 11 with the rotation axis 9 locked and the weight on the operating microscope 11 side changes, the weight balance is always maintained by moving the counterweight W. It is designed to hang down.

Here, the direction in which the surgical microscope 11 is lowered by its weight (the direction in which the counter weight W is raised) is defined as the first rotation direction A, and the direction in which the counter weight W is lowered by its weight (the direction in which the surgical microscope 11 is raised) is defined as the second rotation direction B. , Since the rotation moment to rotate in the first rotation direction A and the rotation moment to rotate in the second rotation direction B are equal, no matter what position the doctor holds the surgical microscope 11 by hand and moves it to any position. The state of the parallel link mechanism L after the movement is maintained, and the surgical microscope 11 stops at the aerial position where the movement is made and does not move.

When the weight on the operating microscope 11 side changes, not only the rotational moment centered on each of the connecting portions a to d of the parallel link mechanism L, but also the rotation of the entire parallel link mechanism L when the rotation axis 9 is freed. The rotational moment around the axis 9 also changes. This change is balanced by the movement of another weight 12 provided inside the front arm 5. Therefore, even if the entire parallel link mechanism L is rotated about the rotation axis 9, the parallel link mechanism L stops as it is in the state after the rotation.

Regarding the balance of the rotational moments in the first rotational direction A and the second rotational direction B at each of the connecting portions a to d of the parallel link mechanism L, the cause of the rotational moment in the first rotational direction A is the surgical microscope 11 and its suspension. Although it is only the weight of the lower arm 10, the rotational moment in the second rotation direction B that opposes the weight is not only the weight of the counter weight W but also another assist structure is provided.

The connecting portion c between the front arm 5 and the lower arm 8 has a state in which the front end portion of the lower arm 8 is overlapped with the lower end portion of the front arm 5, and the central shaft 13 formed on the front arm 5 side and the lower portion c. A bearing (not shown) on the arm 8 side is rotatably engaged. A space portion S is formed inside the front end portion of the lower arm 8, and a spiral spring 14 as an assist structure is housed in the space portion S. The spiral spring 14 is formed by forming a long metal plate having high elasticity in a non-contact spiral shape.

Then, from the formed state, the outer end 17 is further rotated in the winding direction around the inner end 15 of the spiral spring 14, the inner end 15 is engaged with the groove 16 of the central shaft 13, and the outer end 17 is the space portion S. Each is engaged with the groove portion 18 of the inner wall. By doing so, the spiral spring 14 stores a force F for the outer end 17 to return to its original position, and the lower arm 8 is rotated with respect to the central axis 13 of the front arm 5 in the second rotation direction B. A moment (torque) is always generated. Therefore, since a part of the rotational moment in the second rotational direction B is supplemented by the spiral spring 14, the counterweight W can be lightened by that amount. As the counterweight W becomes lighter, the total weight of the stand device 1 is reduced, and it becomes easier for an assistant or the like to push the stand device 1 and move it on the floor of the operating room with the casters 2 of the base 3.

In particular, since the spiral spring 14 is provided at the connecting portion c at the lower end of the front arm 5 formed to be wide, a relatively large spiral spring 14 can be adopted, and a larger rotational moment is applied to the second rotation direction B. be able to.

The rotational moment generated by the spiral spring 14 changes with the state of the parallel link mechanism L (height position of the operating microscope 11) or with time, but the counter weight W includes the change in the length of the lower arm 8. Such a change in rotational moment is not a problem as it moves to the optimum position in the direction.

Further, since the spiral spring 14 is provided inside the front end portion of the lower arm 8, the design of the stand device 1 does not need to be significantly changed, the appearance quality of the stand device 1 can be maintained, and a large-scale structure is not required. Therefore, it is also advantageous in terms of cost.

In this embodiment, the example in which the spiral spring 14 is provided at the connecting portion c at the lower end of the front arm 5 is shown, but it may be provided at the upper end b of the front arm 5 or at both the upper and lower ends. Further, small spiral springs may be provided at the upper and lower connecting portions a and d of the rear arm 6.

1 Stand device 4 Stand body 5 Front arm 6 Rear arm 7 Upper arm 8 Lower arm 9 Rotation axis 11 Operating microscope (medical optical equipment)
14 Swirl spring a to d Connecting part A 1st rotation direction B 2nd rotation direction F Swirl spring force L Parallel link mechanism S Space part W Counter weight

Claims (2)

Two parallel front and rear arms and two parallel upper and lower arms are included with respect to the stand body installed on the floor, and the connecting portion of each arm is rotatably supported in parallel. The link mechanism is rotatably attached around the rotation axis set in the middle of the front arm.
The upper arm extends forward beyond the parallel linkage and at its front end is supported by medical optics.
The lower arm extends rearward beyond the parallel linkage and is supported by a counterweight at the rear end.
The balance of each rotational moment in the first rotation direction in the direction in which the medical optical device is lowered and the second rotation direction in the direction in which the counter weight is lowered maintains the state of the parallel link mechanism without rotating each connecting portion. It is a stand device for medical optical equipment.
A stand device for a medical optical instrument, characterized in that at least one of the connecting portions in the parallel link mechanism is provided with a spiral spring that applies a rotational moment in a second rotational direction related to a counter weight. The stand device for medical optical equipment according to claim 1, wherein the front arm is formed wider than the rear arm, and a spiral spring is provided at a connecting portion of the upper end and / or the lower end of the front arm in the parallel link mechanism. ..

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