JP6769608B2 - Medical stand device - Google Patents

Description

The present invention relates to a medical stand device.

The stand device has a structure that uses a parallel link mechanism so that medical equipment such as a surgical microscope and a camera can be moved back and forth. The horizontal arm is connected to the stand body by two parallel vertical arms, the medical device is supported in a suspended state at the front end of the horizontal arm, and the parallel link mechanism including the two vertical arms is deformed back and forth. As a result, the medical device can be moved back and forth together with the horizontal arm. The weight balance of this medical device is generally performed by a counterweight, but a structure for balancing the weight of the medical device by the repulsive force of a compression spring combined with one of the vertical arms has also been proposed (for example, Patent Documents). 1).

Japanese Unexamined Patent Publication No. 2014-168818

However, in such a related technology, since the structure is such that the weight of the medical device is balanced by the repulsive force obtained by compressing the compression spring, the medical device can only be tilted when the compression spring is compressed. The weight could not be balanced, and it did not correspond to both front and rear tilts.

The present invention has been made focusing on such a related technique, and an object of the present invention is to provide a medical stand device capable of balancing the weight of a medical device at any time of tilting forward or backward.

According to the first technical aspect of the present invention, a parallel link mechanism is formed by connecting a stand body and a horizontal arm with two parallel front arms and rear arms having rotating shafts at both ends to form a horizontal link mechanism. A medical stand device that supports medical equipment at the front end of the arm and allows the horizontal arm side to tilt back and forth with respect to the vertical centering on the rotation axis of the front arm and the rear arm on the stand body side. A spring that expands and contracts linearly along the line is provided, and a stopper that locks the lower end of the spring is provided on the front arm, and the upper end of the spring is locked on the upper part of the rear arm to the front side of the horizontal arm. When tilting, the spring is compressed by the relative displacement of the stopper with respect to the rear arm in the pushing direction, and when tilting to the rear side of the horizontal arm, the spring is pulled by the relative displacement of the stopper with respect to the rear arm in the pulling direction. It is characterized by generating a repulsive force against.

According to the second technical aspect of the present invention, a spring is provided on the outside of the rear arm, a long hole-shaped through hole is formed in the stopper along the front-rear direction through which the rear arm penetrates, and the stopper is slidable back and forth. The rail provided with the slider is fixed, and the lower end of the spring is locked with respect to the slider.

According to the third technical aspect of the present invention, the rotation axis of the rear arm in the stand body is located at a position higher than the rotation axis of the front arm.

According to the first technical aspect of the present invention, a spring for pushing and pulling is attached to the rear arm as a spring, the upper end thereof is locked to the upper part of the rear arm, and the lower end is locked to the stopper integrated with the front arm. , When the horizontal arm is tilted forward, the spring is compressed and a repulsive force is generated, and when the horizontal arm is tilted backward, the spring is pulled and a repulsive force is generated. In this case, the weight of the medical device can be balanced.

According to the second technical aspect of the present invention, the rear arm is stable because the rear arm penetrates the through hole of the stopper. Since the through hole is elongated, it is possible to allow the relative back and forth movement of the rear arm in the through hole. Since the lower end of the spring is locked to a slider that can slide back and forth, even if the rear arm moves relatively back and forth while the repulsive force is generated in the spring, friction and resistance that prevent it are less likely to occur and it is smooth. The front and back movement is performed.

According to the third technical aspect of the present invention, since the rear arm is located higher than the front arm, the distance between the front arm and the rear arm is widened when the vehicle is tilted forward, which is frequently used, and the rear arm is sufficiently forward. A large amount of tilt can be secured.

A side view showing a medical stand device. The perspective view which shows the main part of the medical stand apparatus. A perspective view showing a slider. A side view showing a state in which the horizontal arm is moved to the front side. A side view showing a state in which the horizontal arm is moved to the rear side.

1 to 5 are views showing a preferred embodiment of the present invention.

FIG. 1 is an overall view showing the stand device 1. The stand body 2 of the stand device 1 is installed on the floor. A pair of left and right front arms 3 and lower rotation shafts 3a and 4a of the rear arm 4 are pivotally supported on the stand body 2, respectively. The rotating shafts 3a and 4a are attached at an inclination of 45 degrees from the horizontal with the rotating shaft 4a facing up with respect to the horizontal. The front arm 3 and the rear arm 4 have the same length, and the vertical is the reference state.

A horizontal arm 5 is pivotally supported on the rotation shafts 3b and 4b on the upper side of the front arm 3 and the rear arm 4. The rotation shafts 3b and 4b on the horizontal arm 5 are also set at an inclination of 45 degrees.

Since the front arm 3 and the rear arm 4 are parallel and have the same length, the parallel link mechanism A is formed between the virtual link side 3a-4a fixed to the stand body 2 and the virtual link side 3b-4b fixed to the horizontal arm 5. It is composed.

A tip portion 8 is connected to the horizontal arm 5 by a pair of left and right arms 6 and 7, respectively, and a medical device 9 is supported by the tip portion 8. Of the rotation shafts 6a, 6b, 7a, and 7b of the upper and lower arms 6 and 7, between the rotation shaft 6a on the rear side of the upper arm 6 and the rotation shaft 7b on the front side of the lower arm 7. Is provided with a tension spring 10.

Of the front arm 3 and the rear arm 4, a spring 11 is provided on the rear arm 4 side over substantially the entire length. The spring 11 is a coil spring that also serves as a push and pull, has a characteristic of generating a repulsive force in both the compression direction and the tension direction, and is provided on the outside of the rear arm 4. In the present embodiment, for convenience of explanation, the spring 11 will be described as having a substantially natural length that does not generate a repulsive force when the front arm 3 and the rear arm 4 are in the vertical state.

A stopper 12 is fixed below the front arm 3. The stopper 12 extends toward the rear arm 4 at a right angle to the main axis direction of the front arm 3. The stopper 12 is formed with two rows of elongated through holes 13 through which the rear arm 4 penetrates along the front-rear direction. Since the rear arm 4 penetrates the through hole 13, the state is stable and reliable torque transmission can be performed.

A rail 14 along the front-rear direction is fixed between the through holes 13 of the stopper 12, and the slider 15 is slidably engaged with the rail 14. A plurality of balls that can roll freely exist between the rail 14 and the slider 15, and the slider 15 smoothly moves back and forth without resistance.

The slider 15 is composed of a crossbar 16 whose upper portion extends to the left and right, and short elongated support holes 17 are formed at both ends thereof. The rear arm 4 also penetrates the support hole 17. The width of the support hole 17 is smaller than the diameter of the spring 11, and the rear arm 4 penetrates the support hole 17, but the spring 11 cannot penetrate.

A hook 18 having a hole at the tip is fixed to the terminal of the crossbar 16, and the lower end 11a of the spring 11 is bent in a U shape and locked to the hook 18. A similar hook 19 is fixed to the upper part of the rear arm 4, and the upper end 11b of the spring 11 is also locked to the hook 19.

FIG. 4 shows a state in which the horizontal arm 5 is tilted forward. When the horizontal arm 5 is tilted forward, the stopper 12 causes a relative displacement that rises relative to the rear arm 4, so that the spring 11 is compressed. Therefore, the repulsive force of the spring 11 works, and the state is maintained even if the whole is slanted. More specifically, the repulsive force of the spring 11 is applied perpendicularly to the stopper 12 via the slider 15 and converted into a counterclockwise torque around the rotation shaft 3a with respect to the front arm 3. Further, since the diameter of the spring 11 is larger than the support hole 17 of the slider 15, the lower end of the spring 11 is received by the surface around the support hole 17 in the slider 15 and its repulsive force is exerted on the stopper 12 via the slider 15. Can be done.

As the tilt angle of the horizontal arm 5 to the front side increases, the relative displacement of the stopper 12 also increases and the repulsive force increases. Therefore, the weight is balanced at each tilt angle and the horizontal arm 5 can be arbitrarily used for each medical device 9. Can be held in position. In other words, where the clockwise torque around the rotation shaft 4a due to the weight of the heavy object (horizontal arm 5 + medical device 9) increases according to the tilt angle, around the rotation shaft 4a by the spring 11 and the stopper 12. Since the counterclockwise torque of is also increased according to the tilt angle, torque balance can be realized.

When the front arm 3 and the rear arm 4 are tilted forward, the distance between the two increases from the width E to the width E1, so that the distance between the two increases, and a sufficient amount of tilting forward can be secured. Tilt to the front side is a direction that is used exclusively during use, and even if it is tilted sufficiently to the front side, the front arm 3 and the rear arm 4 do not approach each other and interfere with each other.

Due to the change in the distance between the front arm 3 and the rear arm 4, the rear arm 4 moves relatively rearward in the through hole 13 of the stopper 12, but since the through hole 13 has a long hole shape, the movement can be allowed. it can. Further, the relative movement to the rear is performed in a state where the repulsive force of the spring 11 works downward, but the downward repulsive force acts on the means (slider 15 with respect to the rail 14) that can slide back and forth. Friction and resistance in the front-rear direction are greatly reduced, and smooth movement is performed. Therefore, the repulsive force of the spring 11 is efficiently converted into torque for balance.

FIG. 5 shows a state in which the horizontal arm 5 is tilted rearward. When the horizontal arm 5 is tilted to the rear side, the spring 11 is pulled because the stopper 12 causes a relative displacement that is relatively lowered with respect to the rear arm 4, contrary to the front side. Since the lower end 11a and the upper end 11b of the spring 11 are respectively locked, a repulsive force due to being pulled acts on the spring 11, and the state is maintained even if the whole is tilted to the rear side. That is, even when the counterclockwise torque around the rotating shaft 4a due to the weight of a heavy object increases according to the tilt angle, the clockwise torque around the rotating shaft 4a due to the spring 11 and the stopper 12 also increases at the tilt angle. Therefore, the torque balance can be realized even if the horizontal arm 5 is tilted backward.

By tilting to the rear side, the distance between the front arm 3 and the rear arm 4 becomes smaller from the width E to the width E2, but there is no problem because the rear side is not required to be tilted more than the front side (a large tilt is not required). Is important to tilt backwards to some extent). When tilted to the rear side, the rear arm 4 moves relatively forward in the through hole 13, but even in that case, friction and resistance are reduced by the slidable slider 15.

1 Stand device 2 Stand body 3 Front arm 4 Rear arm 5 Horizontal arm 9 Medical equipment 11 Spring 12 Stopper 13 Through hole 14 Rail 15 Slider 16 Crossbar (part of slider)
A parallel link mechanism

Claims (3)

A parallel link mechanism is constructed by connecting the stand body and the horizontal arm with two parallel front arms and rear arms having rotation axes at both ends, and the medical device is supported at the front end of the horizontal arm, and the front arm and the front arm It is a medical stand device that allows the horizontal arm side to tilt back and forth with respect to the vertical centering on the rotation axis on the stand body side of the rear arm.
A spring that expands and contracts linearly along the rear arm is provided, and a stopper that locks the lower end of the spring is provided on the front arm, and the upper end of the spring is locked to the upper part of the rear arm.
When the horizontal arm is tilted forward, the spring is compressed by the relative displacement of the stopper in the pushing direction with respect to the rear arm, and when the horizontal arm is tilted backward, the spring is pulled by the relative displacement of the stopper in the pulling direction with respect to the rear arm. A medical stand device characterized in that each spring generates a repulsive force in the counter-tilt direction. A spring is provided on the outside of the rear arm, and a long hole-shaped through hole is formed in the stopper along the front-rear direction through which the rear arm penetrates. The medical stand device according to claim 1, wherein the medical stand device is locked with respect to a slider. The medical stand device according to claim 1 or 2, wherein the rotation axis of the rear arm in the stand body is located at a position higher than the rotation axis of the front arm.

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