Clamp device

Abstract

To improve operability and durability of a clamp device and miniaturize the clamp device.SOLUTION: A clamp device 1A includes: a fitting part; a first holding part 11 and a second holding part; a first rod 32; a second rod 33; and a base part 22. The first rod 32 includes a first male screw 32a at an outer peripheral surface. The second rod 33 includes: a first female screw 33b at an inner peripheral surface; and a second male screw 33a in an opposite direction to the first male screw 32a at an outer peripheral surface. The base part 22 includes a second female thread 22b. The holding center of the first holding part 11 and the second holding part relative to a pole is positioned on an axis of the first rod 32. The second rod 33 moves relative to the base part 22 such that the end 34 thereof approaches the second holding part when rotating in a forward direction and the end 34 is separated from the second holding part when rotating in a reverse direction. The first holding part 11 and the first rod 32 of which rotations are regulated moves integrally in an axial direction with the rotation of the second rod 33.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a clamping device for securing a medical instrument to a pole. [Background technology]

[0002] In medical settings, infusion pumps and syringe pumps for administering medicinal fluids to patients are used as a type of medical device. These medical devices are generally fixed to the pole of an infusion stand via a clamping device. Examples of documents disclosing such clamping devices include Japanese Patent Application Laid-Open No. 2022-25438 (Patent Document 1).

[0003] The clamping device disclosed in Patent Document 1 includes an attachment portion to which a medical device can be detachably attached, a first holding portion, a second holding portion, and a rod having a first male screw and a second male screw threaded on its outer surface that is opposite to the first male screw. The first holding portion is provided with a first female screw that screws into the first male screw, and the second holding portion is provided with a second female screw that screws into the second male screw. The clamping device disclosed in Patent Document 1 is configured so that the first holding portion and the second holding portion can be moved closer to or farther away from each other by rotating the rod. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2022-25438 Summary of the Invention [Problem to be solved by the invention]

[0005] In the clamping device disclosed in Patent Document 1, when the pole is clamped between the first and second holding parts, not only a reaction force from the pole but also a torque is applied to the threaded portion of the screws. The torque applied in this manner causes galling in the threaded portion of the screws, which may hinder smooth movement of the second holding part or cause damage to the threaded portion of the screws.

[0006] Furthermore, it is desirable for such a clamping device to be compact while solving this problem.

[0007] Therefore, the present invention has been made to solve the above-mentioned problems, and aims to improve the operability and durability of a clamping device for fixing a medical device to a pole, as well as to make it smaller. [Means for solving the problem]

[0008] The clamping device according to the present invention is for fixing a medical device to a pole and includes an attachment portion, first and second holding portions, a first rod, a second rod, and a base portion. The medical device is detachably attached to the attachment portion. The first and second holding portions clamp the pole by sandwiching it between them. The first rod has a first male thread threaded on its outer circumferential surface. The second rod includes at least a hollow portion and is arranged coaxially with the first rod. The second rod has a first female thread threaded on its inner circumferential surface that threads onto the first male thread, and a second male thread threaded on its outer circumferential surface that is oriented in the opposite direction to the first male thread. The base portion has a second female thread threaded onto the second male thread. The first holding portion is attached to one axial end of the first rod. The second holding portion is disposed at a distance from the first holding portion on a side opposite to the side on which the first rod is located, as viewed from the first holding portion. The holding centers of the first holding portion and the second holding portion with respect to the pole are located on the axis of the first rod. The second rod is configured to be movable relative to the base portion such that, when the second rod rotates in a forward direction, an end of the second rod located on the first holding portion side approaches the second holding portion, and when the second rod rotates in a reverse direction, the end moves away from the second holding portion. In the clamping device according to the present invention, the first holding portion and the first rod are configured to move integrally along the axial direction in accordance with the rotation of the second rod, with their rotation being restricted.

[0009] The clamping device according to the present invention may further include a connecting portion that connects the second holding portion and the base portion to each other. In this case, the connecting portion may include a guide portion that moves the first holding portion along the axial direction and restricts rotation of the first holding portion relative to the connecting portion.

[0010] In the clamping device according to the present invention, the first male screw, the first female screw, the second male screw, and the second female screw may be configured as multiple start threads. [Effects of the Invention]

[0011] According to the present invention, in a clamping device for fixing a medical instrument to a pole, it is possible to improve operability and durability, and further to achieve miniaturization. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a perspective view of a clamping device according to an embodiment in a clamping state. [Figure 2] 2 is a perspective view of the clamp device shown in FIG. 1 in a released state. FIG. [Figure 3] 2 is a schematic plan view of the clamp device shown in FIG. 1 in a released state. FIG. [Figure 4] 2 is a schematic side view of the clamp device shown in FIG. 1 in a released state. FIG. [Figure 5] FIG. 5 is a schematic cross-sectional view of the clamping device shown in FIG. [Figure 6] 2 is a schematic plan view of the clamping device shown in FIG. 1 in a clamping state. FIG. [Figure 7] FIG. 7 is a schematic cross-sectional view of the clamping device shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The embodiments shown below illustrate the case where the present invention is applied to a clamping device for fixing an infusion pump, as an example of medical equipment, to a pole. In the embodiments shown below, identical or common parts are designated by the same reference numerals in the drawings, and their description will not be repeated.

[0014] (Embodiment) FIG. 1 is a perspective view of a clamping device according to an embodiment in a clamping state. FIG. 2 is a perspective view of the clamping device shown in FIG. 1 in a released state. FIG. 3 is a schematic plan view of the clamping device shown in FIG. 1 in a released state. FIG. 4 is a schematic side view of the clamping device shown in FIG. 1 in a released state. FIG. 5 is a schematic cross-sectional view of the clamping device taken along line VV in FIG. 4. FIG. 6 is a schematic plan view of the clamping device shown in FIG. 1 in a clamping state. FIG. 7 is a schematic cross-sectional view of the clamping device shown in FIG. 6. The configuration of a clamping device 1A according to this embodiment will be described below with reference to FIGS. 1 to 7. Note that FIG. 7 is a schematic cross-sectional view of the clamping device of a portion corresponding to the schematic cross-sectional view taken along line VV in FIG. 4.

[0015] As shown in FIG. 1, the clamp device 1A is used to fix an infusion pump 200, which is a medical device, to a pole 300 of an infusion stand.

[0016] As shown in Figures 2 to 5, the clamp device 1A includes an attachment portion 100, a first unit 10 having a first holding portion 11, a second unit 20 having a second holding portion 21, and an operating portion 30 having a rod 31.

[0017] The clamp device 1A clamps the pole 300 by rotating the rod 31 to sandwich the pole 300 between the first holding part 11 and the second holding part 21. Hereinafter, the state in which the pole 300 is clamped between the first holding part 11 and the second holding part 21 (see FIGS. 1, 6 and 7) will also be referred to as the clamped state, and the state in which the pole 300 is not clamped between the first holding part 11 and the second holding part 21 (see FIGS. 2 to 5) will also be referred to as the released state. The method of clamping the pole 300 between the first holding part 11 and the second holding part 21 will be described in detail later.

[0018] The mounting portion 100 is a platform-like structure configured to allow the infusion pump 200 to be detachably mounted thereon. More specifically, the infusion pump 200 is mounted to the mounting portion 100 via a fixing screw 101 exposed from the top surface of the mounting portion 100. The method of mounting the infusion pump 200 to the mounting portion 100 is not limited to a method using the fixing screw 101, and can be variously modified to include known mounting methods. The shape of the mounting portion 100 can also be variously modified. The material of the mounting portion 100 is not particularly limited, and it can be made of, for example, resin.

[0019] The operating unit 30 has a rod 31 and a handle portion 39 configured to be able to rotate the rod 31 around an axis line AX. The rod 31 is formed by assembling a first rod 32 and a second rod 33 that are configured as separate bodies.

[0020] The first rod 32 includes at least a substantially cylindrical portion. A first male screw 32a is threaded on the outer circumferential surface of the first rod 32. One end of the first rod 32 has a substantially D-shaped cross section (see FIG. 2 in particular). A first unit 10 having a first holding portion 11 is attached to the one end of the first rod 32 so as to be non-rotatable relative to the first rod 32. The first unit 10 will be described in detail later.

[0021] The second rod 33 includes at least a hollow portion. A handle portion 39 is attached to one axial end of the second rod 33. The handle portion 39 is used to rotate the second rod 33.

[0022] A second male screw 33a, which is threaded in the opposite direction to the first male screw 32a, is formed on the outer circumferential surface of the second rod 33. The two screws being in the opposite directions means that when one screw is configured to be tightened by turning it clockwise as seen by the operator, the other screw is configured to be tightened by turning it counterclockwise as seen by the operator.

[0023] A first female screw 33b that screws onto the first male screw 32a of the first rod 32 is provided on the inner peripheral surface of the second rod 33. With the first male screw 32a screwed onto the first female screw 33b, at least a portion of the first rod 32 is housed inside the second rod 33. Furthermore, the second rod 33 to which the first rod 32 is assembled in this manner is disposed coaxially with the first rod 32.

[0024] The first rod 32 and the second rod 33 are made of a material such as iron, brass, or stainless steel. The first rod 32 and the second rod 33 may be made of different materials. The handle portion 39 is made of a material such as resin.

[0025] The first unit 10 has a first holding portion 11 and a bottom wall portion 12. The first unit 10 is attached to one end of the first rod 32 in the axial direction, and is positioned outside the second rod 33 so as to be exposed.

[0026] The first holding part 11 clamps the pole 300 together with the second holding part 21. The first holding part 11 is made up of a pair of plate-like parts positioned opposite each other. These plate-like parts are provided with first holding grooves 11a that are approximately V-shaped in plan view. This allows the first holding part 11 to abut against the pole 300 at multiple points. Note that the first holding part 11 is not limited to being made up of a pair of plate-like parts, and may be made up of, for example, a block-shaped part.

[0027] The bottom wall portion 12 is a portion having a generally plate-shaped outer shape. The pair of plate-shaped portions constituting the first holding portion 11 are both erected from the bottom wall portion 12. As a result, the first unit 10 as a whole has a generally U-shaped shape in a side view (see FIG. 4 in particular).

[0028] The first rod 32 is attached to the bottom wall 12 so that the first rod 32 cannot rotate relative to the first unit 10. More specifically, the bottom wall 12 is provided with an engagement hole that is substantially D-shaped when viewed from a direction perpendicular to the main surface of the bottom wall 12 (see FIG. 2 in particular). One end of the first rod 32 is inserted into this engagement hole, thereby engaging the first rod 32 so that the first rod 32 cannot rotate relative to the first unit 10.

[0029] Here, a locking hole extending in a direction perpendicular to the axial direction of the first rod 32 is provided at the one end of the first rod 32. A locking pin 90 is inserted into this locking hole, thereby preventing the one end of the first rod 32 from falling off from the engagement hole in the bottom wall portion 12.

[0030] The second unit 20 has a second holding portion 21, a base portion 22, and a connecting portion 23 that connects the second holding portion 21 and the base portion 22 to each other.

[0031] The second holding portion 21 clamps the pole 300 together with the first holding portion 11. The second holding portion 21 is made up of a pair of plate-like portions positioned opposite each other. These plate-like portions are provided with second holding grooves 21a that are approximately V-shaped in plan view. This allows the second holding portion 21 to abut against the pole 300 at multiple points. Note that the second holding portion 21 is not limited to being made up of a pair of plate-like portions, and may be made up of, for example, a block-shaped portion.

[0032] The second holding part 21 is disposed at a distance from the first holding part 11 on the opposite side from the side on which the first rod 32 is located when viewed from the first holding part 11 .

[0033] The base portion 22 is a portion having a generally plate-shaped outer shape. The base portion 22 has a hole that penetrates it in the thickness direction. A second female screw 22b is provided on the side of this hole. A second male screw 33a of a second rod 33 is screwed into the second female screw 22b of the base portion 22. In this way, the rod 31 is assembled to the base portion 22.

[0034] The second female screw 22b of the base portion 22, and the first male screw 32a of the first rod 32, the first female screw 33b of the second rod 33, and the second male screw 33a of the second rod 33 described above are all configured as double-start threads. Note that the first male screw 32a, the second male screw 33a, the first female screw 33b, and the second female screw 22b may be configured as multiple-start threads other than double-start threads.

[0035] The connecting portion 23 includes a portion having a generally plate-shaped outer shape. The longitudinal direction of the connecting portion 23 roughly coincides with the axial direction of the first rod 32.

[0036] The second holding portion 21 is erected at one longitudinal end of the connecting portion 23. The base portion 22 is erected at the other longitudinal end of the connecting portion 23 so as to face the second holding portion 21 when the second unit 20 is viewed from above. As a result, the second unit 20 has a generally U-shaped overall shape when viewed from above.

[0037] An attachment part 100 is attached to the connecting part 23. The method of fixing the attachment part 100 to the connecting part 23 is not particularly limited, and for example, the attachment part 100 may be attached to the connecting part 23 with a plurality of fixing screws, or the attachment part 100 may be configured as an integral part of the connecting part 23.

[0038] 2 and 4, the connecting portion 23 is provided with guide portions 23a erected from both ends in the width direction thereof. The guide portions 23a are configured with a pair of plate-shaped portions extending along the longitudinal direction of the connecting portion 23. Of the pair of plate-shaped portions, the portion located on one end side in the longitudinal direction also configures the second holding portion 21 described above.

[0039] The first holding portion 11 is disposed in a space sandwiched between a pair of plate-shaped portions that constitute the guide portion 23a. The distance between the first holding portion 11 and the guide portion 23a is configured to be small enough to restrict rotation of the first holding portion 11 around the axis AX of the first rod 32. The first holding portion 11 may abut against the guide portion 23a.

[0040] When the first unit 10 moves relative to the second unit 20 in accordance with the rotation of the second rod 33, the guide portion 23a restricts the rotation of the first holding portion 11 and the first rod 32 to which it is attached, and thus restricts the rotation of the first holding portion 11 and the first rod 32 relative to the connecting portion 23. As a result, the first holding portion 11 and the first rod 32 are configured to move integrally along the axial direction of the first rod 32 in accordance with the rotation of the second rod 33.

[0041] As shown in Figure 3, when the clamping device 1A is viewed in a plane, the axis AX of the first rod 32 extends in a predetermined direction so that the distance between the position on the axis AX that overlaps with the first holding portion 11 and the mounting portion 100 (see dimension d1 in the figure) is greater than the distance between the position on the axis AX that overlaps with the second holding portion 21 and the mounting portion 100 (see dimension d2 in the figure).

[0042] This ensures a sufficient space between the handle portion 39, which is disposed on the axis AX, and the mounting portion 100 and the medical device attached thereto, compared to when the axis AX extends in a predetermined direction so that the above two distances are the same, thereby improving the operability of the operating portion 30 by the user.

[0043] Here, the holding center HC (see FIGS. 3 and 6, etc.) of the first holding part 11 and the second holding part 21 relative to the pole 300 is located on the axis AX of the first rod 32. This makes it possible to improve the operability and durability of the clamp device 1A, which will be described in detail later.

[0044] In the clamp device 1A configured as above, the second rod 33 is configured to be movable relative to the base portion 22.

[0045] 6 and 7, when the second rod 33 rotates in the forward direction, it moves relative to the base part 22 toward the second holding part 21 along the axial direction of the first rod 32 (see arrow AR1 in the figures). As a result, the end part 34 of the second rod 33 located on the first holding part 11 side approaches the second holding part 21.

[0046] During this movement, the first rod 32 moves along its axial direction relative to the second rod 33 toward the second holding part 21 (see arrow AR2 in the figure). This is because, as described above, the first male screw 32a of the first rod 32 is configured with a screw thread that is threaded in the opposite direction to the second male screw 33a of the second rod 33, and rotation of the first rod 32 is restricted.

[0047] As the first rod 32 and the second rod 33 move in this manner, the first holding portion 11 approaches the second holding portion 21.

[0048] Similarly, when the second rod 33 rotates in the opposite direction, it is moved relative to the base portion 22 along the axial direction of the first rod 32 toward the side opposite to the second holding portion 21. As a result, the end portion 34 of the second rod 33 moves away from the second holding portion 21. During this movement, the first rod 32 moves relative to the second rod 33 along the axial direction toward the side opposite to the second holding portion 21. As the first rod 32 and the second rod 33 move in this manner, the first holding portion 11 moves away from the second holding portion 21.

[0049] Here, the guide portion 23a extends along a direction that generally coincides with the axial direction of the first rod 32. Therefore, the first holding portion 11 and the first rod 32 are guided by the guide portion 23a so as to move along the axial direction.

[0050] In the clamping device 1A configured as described above, when clamping the pole 300 between the first holding portion 11 and the second holding portion 21, first, with the clamping device 1A in the released state (see Figures 2 to 5), the pole 300 is placed in the space between the first holding portion 11 and the second holding portion 21.

[0051] Next, the second rod 33 is rotated using the handle portion 39 to place the clamp device 1A in a clamping state (see FIGS. 6 and 7). More specifically, the first holding portion 11 and the second holding portion 21 are both in contact with the outer circumferential surface of the pole 300, and the first holding portion 11 is brought close to the second holding portion 21 so that the holding centers HC of the first holding portion 11 and the second holding portion 21 relative to the pole 300 overlap with the axial center of the pole. This causes the pole 300 to be clamped between the first holding portion 11 and the second holding portion 21.

[0052] In the clamp device 1A according to this embodiment, the holding centers HC of the first holding portion 11 and the second holding portion 21 relative to the pole 300 are located on the axis AX of the first rod 32, as described above.

[0053] By configuring it in this manner, when the pole 300 is clamped between the first holding portion 11 and the second holding portion 21, it is possible to effectively prevent torque caused by a reaction force from the pole 300 from being applied to the threaded portion between the first male screw 32a of the first rod 32 and the first female screw 33b of the second rod 33, and to the threaded portion between the second male screw 33a of the second rod 33 and the second female screw 22b of the base portion 22.

[0054] As a result, galling at the threaded portions of the screws is effectively suppressed, which in turn makes it possible to prevent problems such as impeding smooth movement of the first holding part 11 relative to the second holding part 21, damage to the threaded portions of the screws, or excessive force being required to rotate the second rod 33. This makes it possible to improve the operability and durability of the clamp device 1A.

[0055] Furthermore, in the clamping device 1A according to this embodiment, as described above, the first male thread 32a threaded into the first rod 32 is threadedly engaged with the first female thread 33b provided on the inner surface of the second rod 33, thereby causing at least a portion of the first rod 32 to be housed inside the second rod 33.

[0056] With this configuration, when the clamp device 1A is viewed from above, the overall length of the clamp device 1A along the axial direction of the first rod 32 can be shortened by the amount that the first rod 32 and the second rod 33 overlap, resulting in a sufficiently compact clamp device 1A. This effect is particularly noticeable when the clamp device 1A is in the released state.

[0057] Therefore, by configuring the clamp device 1A of this embodiment, it is possible to improve the operability and durability of a clamp device for fixing a medical device to a pole, and also to make it smaller.

[0058] Furthermore, in the clamp device 1A according to this embodiment, as described above, the first male screw 32a, the first female screw 33b, the second male screw 33a, and the second female screw 22b are all configured as multiple threads.

[0059] By configuring them in this manner, the amount of movement of the first holding portion 11 per rotation of the second rod 33 can be increased compared to when they are configured with a single-thread screw, thereby reducing the burden on the operator of the clamp device 1A.

[0060] In the clamp device 1A according to the present embodiment described above, the mounting portion 100 has been described as having a trapezoidal shape, but the mounting portion 100 is not limited to this and may be configured with a known fastener or the like.

[0061] Furthermore, in the clamping device 1A according to the present embodiment described above, the first male screw 32a, the first female screw 33b, the second male screw 33a and the second female screw 22b are described as multiple-start threads, but these may also be single-start threads.

[0062] (Other forms, etc.) The shape, configuration, size, number, material, etc. of each part shown in the above-described embodiment of the present invention can be changed in various ways without departing from the spirit of the present invention.

[0063] Furthermore, the characteristic configurations shown in the above-described embodiments of the present invention can naturally be combined with each other within the scope permitted in light of the spirit of the present invention.

[0064] As such, the above-described embodiments disclosed herein are illustrative in all respects and are not restrictive. The technical scope of the present invention is defined by the claims, and includes all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0065] 1A clamp device, 10 first unit, 11 first holding portion, 11a first holding groove, 12 bottom wall portion, 20 second unit, 21 second holding portion, 21a second holding groove, 22 base portion, 22b second female screw, 23 connecting portion, 23a guide portion, 30 operating portion, 31 rod, 32 first rod, 32a first male screw, 33 second rod, 33a second male screw, 33b first female screw, 34 end portion, 39 handle portion, 90 locking pin, 100 mounting portion, 101 fixing screw, 200 infusion pump, 300 pole, AX axis, HC holding center.

Claims

1. 1. A clamping device for securing a medical device to a pole, comprising: an attachment portion to which the medical device is detachably attached; a first holding portion and a second holding portion that sandwich the pole to hold the pole; a first rod having a first male screw threaded on its outer circumferential surface; a second rod including at least a hollow portion, arranged coaxially with the first rod, having an inner circumferential surface provided with a first female screw that screws into the first male screw, and an outer circumferential surface provided with a second male screw that is threaded in an opposite direction to the first male screw; a base portion provided with a second female screw that screws onto the second male screw, the first holding portion is attached to one end of the first rod in the axial direction, the second holding portion is disposed at a distance from the first holding portion on a side opposite to a side on which the first rod is located, as viewed from the first holding portion; a holding center of the first holding portion and the second holding portion with respect to the pole is located on an axis of the first rod, the second rod is configured to be movable relative to the base portion such that, when the second rod rotates in a forward direction, an end portion of the second rod located on the side of the first holding portion approaches the second holding portion, and when the second rod rotates in a reverse direction, the end portion moves away from the second holding portion; A clamping device in which the first holding portion and the first rod are configured to move integrally along the axial direction in accordance with the rotation of the second rod by restricting their rotation.

2. a connecting portion that connects the second holding portion and the base portion to each other, The clamp device according to claim 1 , wherein the connecting portion includes a guide portion that moves the first holding portion along the axial direction and restricts rotation of the first holding portion relative to the connecting portion.

3. The clamping device according to claim 1 or 2, wherein the first male screw, the first female screw, the second male screw, and the second female screw are configured as multiple-start threads.

Images