JP2015211128A - Housing structure of medical electronic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a housing structure of a medical electronic device which is advantageous for downsizing of a housing, enables easy assembly, and achieves stable sealability.SOLUTION: A housing structure of a medical electronic device includes: a lower housing 10; an upper housing 20 attached to the lower housing 10; and a packing 30 disposed on joint surfaces of the lower housing 10 and the upper housing 20. Protrusions which press the packing 30 are provided at the lower housing 10 and the upper housing 20. The packing 30 is pressed by the protrusions when the upper housing 20 is attached to the lower housing 10.

Description

  The present invention relates to a housing structure of a medical electronic device, and more particularly to a housing structure for preventing liquid, gas, dust and the like from entering a space inside the housing.

  Conventionally, medical electronic devices are relatively large, generally used in hospital laboratories and used by medical personnel, and are not particularly required to be drip-proof / waterproof or dustproof. It was. However, in recent years, digital Holter electrocardiographs and telemeters have become smaller and lighter, and patients and subjects can measure, record and monitor biological signals while carrying medical electronic devices in daily life. It is increasing.

  Therefore, for example, Patent Literature 1 proposes a housing structure that realizes a medical electronic device having a waterproof structure that can be easily opened and closed while having waterproofness.

Japanese Patent No. 4855767

  In Patent Document 1, in a housing in which a lid that can be opened and closed is attached to a main body, a packing is fitted into a groove provided to surround the opening on the lower surface edge of the lid, and continuously on the upper surface of the main body. It has the structure which presses packing with the provided rib and deform | transforms packing.

  In the configuration of Patent Document 1, since the packing is configured to be fitted into the groove, the groove requires a certain depth, which is disadvantageous for downsizing the casing in the height direction. Further, since the thin annular packing is easily twisted, it is not easy to fit the whole into the groove so as not to be twisted. Furthermore, it is not easy to secure a space for escaping the deformed portion when the packing is pressed by the rib. In Patent Document 1, a recess is provided at the bottom of the groove to create a space for the deformed packing to escape and reduce the force required to close the lid. This is further disadvantageous for downsizing in the vertical direction.

  The present invention has been made in view of the above-described problems of the prior art, and provides a housing structure for a medical electronic device that is advantageous for downsizing the housing, is easy to assemble, and can realize stable sealing. The purpose is to do.

  The above-described object is a housing structure of a medical electronic device, and corresponds to a first housing having an opening, a first joint surface formed on an outer edge of the opening, and the first joint surface. A second housing that has a second joint surface and is attached to the first housing such that the first joint surface and the second joint surface face each other; and the first joint surface and the second joint surface The first and second bonding surfaces are each provided with a protrusion so as to surround the opening, and the packing includes the second casing. This is achieved by a housing structure that is pressed by protrusions provided on the first joint surface and the second joint surface when the first housing is attached to the first joint surface.

  With the above configuration, according to the present invention, it is possible to provide a housing structure of a medical electronic device that is advantageous for downsizing the housing, is easy to assemble, and can realize a stable sealing property.

It is a disassembled perspective view which shows an example of the housing structure of the medical electronic device which concerns on embodiment of this invention. 4 is a diagram illustrating a configuration example of a back surface side (a housing inner surface side) of the upper housing 20. FIG. 4 is a top view illustrating a configuration example of the lower housing 10. FIG. It is a vertical sectional view showing the state around the joint surface after housing assembly. It is the figure which expanded the packing 30 part in FIG. It is a figure which shows the other structural example of a linear protrusion.

Hereinafter, the present invention will be described in detail based on preferred embodiments with reference to the drawings.
FIG. 1 is an exploded perspective view showing an example of a housing structure of a medical electronic device according to an embodiment of the present invention. The housing 100 includes a lower housing 10 (first housing) having a housing portion 18 and a battery housing portion 11 for circuit components, a lid-like upper housing 20 (second housing), and a packing. 30. The upper housing 20 is provided with a screw hole 21, and a screw receiver 12 is provided at a position corresponding to the screw hole 21 of the lower housing 10. The upper housing 20 is screwed to the lower housing 10. Attached by. At this time, the packing 30 is disposed so that the upper housing 20 and the lower housing 10 are interposed between the respective joining surfaces 22 (FIG. 2) and 13.

  In the present embodiment, the case where waterproofing (liquidproofing) is imparted by the packing 30 will be described. However, the function realized by the packing 30 is not limited to waterproofing, and may be a function of preventing entry of dust and gas. . Although there is no restriction | limiting in the material of the packing 30, For example, the rubber-type raw material which has flexibility and waterproofness like a silicone rubber is preferable. Moreover, since the force required for screwing when attaching the upper housing | casing 20 to the lower housing | casing 10 will become large if hardness is large, it is preferable to set it as soft hardness in the range which can implement | achieve waterproofness.

  The packing 30 of the present embodiment has a frame shape that surrounds the opening of the accommodating portion 18 and has a width larger than the thickness in the vertical cross section. Unlike the prior art, the packing 30 according to the present embodiment does not need to be fitted into the groove, and is pressed by a protrusion from both the upper housing 20 and the lower housing 10 as described later, so that the thickness is small. Since favorable waterproofness is obtained, it can be formed into a thin sheet. Therefore, it can be easily manufactured from a sheet-like material by a method such as punching. Moreover, since it is not necessary to provide a groove in the housing, it is advantageous for downsizing the housing.

  2A and 2B are diagrams showing a configuration example of the back surface side (the housing inner surface side) of the upper housing 20, FIG. 2A is a perspective view, and FIG. 2B is a plan view. On the back surface of the upper housing 20, a wall portion 25 having a contour that is slightly smaller than the contour of the inner surface 301 (FIG. 1) of the packing 30 is formed. The wall portion 25 restricts the position of the inner side surface 301 of the packing 30, thereby providing a function for maintaining the shape and positioning of the packing 30 and facilitating assembly of the housing. In the present embodiment, the wall portion 25 is formed without breaks, but a portion corresponding to a part of the contour may be missing.

  The outer periphery or outer edge of the wall portion 25 on the back surface of the upper housing 20 constitutes a joint surface (second joint surface) 22 of the upper housing 20. The joining surface 22 is provided with a continuous linear protrusion 24 that presses the packing 30 during assembly. The linear protrusion 24 is formed such that its outline is a mirror image or similar shape of the outline of the linear protrusion 14 provided on the joint surface (first joint surface) 13 of the lower housing 10 or a scaled image thereof. Is done.

  FIG. 3 is a top view illustrating a configuration example of the lower housing 10. The outer peripheral portion of the opening of the lower housing 10 constitutes a joint surface (first joint surface) 13 of the lower housing 10. Further, a continuous linear protrusion 14 is formed on the outer edge of the opening in the joint surface 13. In this embodiment, the linear protrusion 14 is provided on the outer edge of the opening, and the outline of the opening and the linear protrusion 14 is similar. However, the linear protrusion 14 has an opening (contour). The contour of the linear protrusion 14 may not be similar to the contour of the opening as long as it is formed so as to surround the packing and can press the packing all around. For example, as shown as 14 ', the linear protrusion may be formed away from the outer edge of the opening.

  In the present embodiment, since the packing 30 is pressed by both the linear protrusions 14 and 24, the linear protrusions 14 and 24 are located at positions where the outline contacts the packing 30 over the entire circumference during assembly. It is formed. Moreover, when it presses from the upper and lower sides at the same position, the deformation amount of the packing 30 is the largest and waterproof performance becomes high. Therefore, it is preferable to determine the contour and the arrangement so that the contours of the linear protrusions 14 and 24 are in a mirror image relationship and so that the linear protrusions 14 and 24 face each other over the entire circumference. As will be described later, the linear protrusions 14 and 24 are formed to have different vertical cross-sectional shapes orthogonal to the length direction.

  FIG. 4 is a vertical sectional view showing a state around the joint surface after the housing is assembled. As described above, the casing is assembled by fastening the upper casing 20 and the lower casing 10 with screws passing through the screw holes 21 and the screw receivers 12 with the packing 30 interposed therebetween. The packing 30 is interposed between the joint surface 13 of the lower housing 10 and the joint surface 22 of the upper housing 20 and is pressed (compressed) in the vertical direction by the linear protrusions 14 and 24. Since the packing 30 is arranged so as to have a gap 41 between the upper casing 20 and the lower casing 10 without being fitted into the groove, the packing 30 can be deformed in a direction to fill the gap 41. That is, a portion deformed by being pressed by the linear protrusions 14 and 24 can be released to the gap 41. Therefore, there is no need to form a groove in the packing 30 itself as described in the prior art or to form a space on the housing side for allowing a deformed portion of the packing 30 to escape.

  Since the packing 30 is not bonded to any of the joining surfaces 13 and 22, the deformation of the packing 30 is not hindered. In FIG. 4, all of the upper surface, the lower surface, the inner surface, and the outer surface of the packing 30 are arranged so as to have a gap with the housing 41. From the viewpoint of not preventing deformation, at least in the assembled state. What is necessary is just to arrange | position so that one surface may have a housing | casing and the clearance gap 41. FIG. In addition, if it arrange | positions so that at least one of an inner surface and an outer surface may have a housing | casing and the clearance gap 41, an assembly can be made easy.

  With reference to FIG. 5 in which the packing 30 portion in FIG. 4 is enlarged, the pressing configuration of the packing 30 will be further described. In the present embodiment, the lower housing 10 and the upper housing 20 are formed such that the joint surfaces 13 and 22 have a distance d1 even after assembly. Therefore, even if the screw for attaching the upper housing 20 to the lower housing 10 is tightened, the distance d1 is maintained. The height of the linear protrusions 14 and 24 and the thickness of the packing 30 are set so that the distance d3 between the linear protrusions 14 and 24 after assembly and the thickness d2 of the packing 30 when not deformed satisfy d2> d3> 0. And have been determined.

  In addition, when the value of (d2-d3) becomes large, the force required for deforming (compressing) the packing 30 at the time of assembling becomes large, and assembling becomes difficult. For this reason, it is preferable to determine d2 and d3 so that (d2−d3) is reduced within the range where the relationship d2> d3> 0 is satisfied and a desired waterproof performance is obtained. Further, if the thickness d2 of the packing 30 when not deformed satisfies d2 ≧ d1, the force necessary for assembly is also increased. Since waterproof performance is obtained by pressing by the linear protrusions 14 and 24, it is preferable that the thickness d2 of the packing 30 <the joined surface distance d1 after assembly. By setting d2 <d1, a gap 41 is generated between the packing 30 and the joining surfaces 13 and 22, so that it is easy to release the deformed portion of the packing 30 pressed by the linear protrusions 14 and 24. It can reduce the power required at times.

  Moreover, in this embodiment, in order to efficiently deform the packing 30 by the linear protrusions 14 and 24 and to exhibit the sealing performance by the packing 30, the linear protrusions 14 and 24 are formed to be thinner toward the tip. . Specifically, the linear protrusions 14 and 24 have a vertical cross-sectional shape perpendicular to the length direction, or a triangular shape with the joint surfaces 13 and 22 as the base, or the joint surfaces 13 and 22 as the lower base, and the upper base is The trapezoid is shorter than the bottom. In addition, although the one where the area of the uppermost part of the linear protrusions 14 and 24 is smaller facilitates the deformation of the packing 30, it is formed not on an edge (linear) but on a flat surface or a convex curved surface for safety reasons. May be. The linear protrusions 14 and 24 shown in FIGS. 4 and 5 both have an isosceles-triangular cross-sectional shape, but the lengths of the sides may be different.

  This embodiment is characterized in that the cross-sectional shapes of the linear protrusions 14 and 24, specifically, the apex angles are different. In the example shown in FIGS. 4 and 5, the apex angle α of the cross-sectional shape of the linear protrusion 14 included in the lower housing 10 <the vertical angle β of the cross-sectional shape of the linear protrusion 24 included in the upper housing 20. Note that the lengths of the bottoms of the cross-sectional shapes may or may not be equal (thus, the heights of the linear protrusions 14 and 24 may be different). In addition, what is necessary is just to regard the angle which the extension of a hypotenuse intersects as an apex angle, when the cross-sectional shape of a linear protrusion is not a triangle, such as a trapezoid. Or you may comprise so that the angle of a hypotenuse may be varied.

  In this way, by making the cross-sectional shapes of the linear protrusions 14 and 24 different from each other, it is possible to stably realize such deformation that the packing 30 exhibits a sufficient hermeticity. This point will be further described. The packing 30 exhibits better sealing properties as the amount of deformation by the linear protrusions 14 and 24 increases, in other words, as the vertical force received from the linear protrusions 14 and 24 increases. Therefore, the linear protrusions 14 and 24 are formed at positions where their vertices face each other as shown in FIG. However, it is practically impossible to completely eliminate the dimensional error of parts and the slight misalignment when assembling the upper casing 20 and the lower casing 10 which are separate parts. The vertices cannot be opposed across 24 circumferences.

  When the linear protrusions 14 and 24 are misaligned, the upward compressive force by the linear protrusions 14 and the downward compressive force by the linear protrusions 24 are applied to different positions in the width direction of the packing 30. . In this case, the compressive force becomes a shearing force, the compressive force due to the apex decreases, and the compressive force due to the slope facing the apex of the other linear protrusion increases. That is, the force applied to the packing 30 at the time of assembly is more dispersed. By varying the apex angle of the cross-sectional shape of the linear protrusion, the packing 30 is compressed even when the linear protrusion is misaligned as shown in FIGS. 5B and 5C. The planes are not parallel. Therefore, the packing 30 can be more effectively compressed than when the apex angles are equal, and stable waterproof performance can be realized.

As described above, according to the present embodiment, it is possible to realize a housing structure that is easy to assemble and exhibits sufficient hermeticity while contributing to downsizing of the housing.
In the above-described embodiment, only the configuration in which one set of linear protrusions is provided has been described, but a plurality of linear protrusions may be formed on one joint surface.

  In the above-described embodiment, for the sake of convenience, the case has been described as being divided into an upper case and a lower case, but the dividing direction is not limited to top and bottom. For example, it may be divided in the left-right direction or in an oblique direction.

  In the above-described embodiment, for convenience, it is assumed that the cross-sectional shape of the linear protrusion is uniform over the entire length direction. However, in the cross section perpendicular to the length direction of the linear protrusions, if the vertical cross sectional shapes of the pair of opposing linear protrusions are always different, the cross sectional shapes of the individual linear protrusions extend over the entire length direction. And does not have to be uniform.

  Further, the cross-sectional shape of the linear protrusion does not have to have a linear hypotenuse. For example, it may be a curved hypotenuse as long as it is tapered away from the joint surface. The apex angle may be obtained by approximation with a straight line.

  Moreover, although the above-mentioned embodiment demonstrated the case where it comprised so that an opening part may be enclosed by one continuous linear protrusion (linear protrusion which has the outline of a closed shape) which is not cut | disconnected in the length direction, You may comprise so that the perimeter of an opening part may be enclosed by the several linear protrusion which did. Specifically, for example, as shown in FIG. 6A, the opening 18 may be substantially surrounded by a plurality of linear protrusions 141 and 142. Each of the plurality of linear protrusions 141 and 142 has a portion 143 adjacent to another linear protrusion in the length direction. Thus, when it comprises so that an opening part may be enclosed using a some linear protrusion, it comprises so that all the some linear protrusions may contact the packing 30 in the whole length direction. In FIG. 6A, the plurality of linear protrusions 141 and 142 are arranged so as to be adjacent to each other at both ends. However, in the direction perpendicular to the length direction of the linear protrusion (packing width direction), If it comprises so that one or more linear protrusion may exist, the adjacent site | part of a linear protrusion will not be restrict | limited in particular.

  Moreover, you may use combining a linear protrusion and the protrusion of another shape. For example, in FIG. 6B, frame-like protrusions 12 ′ for forming screw holes are provided at four locations of the linear protrusions 145. The frame-shaped protrusion 12 ′ may be, for example, an upper part of the screw receiver 12 provided in the lower casing 10 or a protrusion that forms a screw hole 21 provided in the upper casing 20. .

  In such a configuration, the packing 30 is pressed by the top surface of the projection 12 ′ at the protrusion 12 ′, and is pressed by the linear protrusion 145 at the other portion, so that the entire periphery of the opening 18 is pressed. Is done. Since the protrusion 12 'forms a screw hole, a force for tightening the screw is directly applied. Accordingly, the top surface of the protrusion 12 ′ may be a flat surface, but the top surface of the protrusion 12 ′ may have a convex shape like the linear protrusion. Further, the protrusion 12 'does not necessarily need to form a screw hole, and may not have a frame shape.

  6A and 6B show only the configuration of the lower housing 10, the upper housing 20 may have the same configuration. Moreover, you may combine the structure of Fig.6 (a) and the structure of FIG.6 (b).

Claims (10)

A housing structure for medical electronic equipment,
A first housing having an opening and a first joint surface formed on an outer edge of the opening;
A second housing having a second joint surface corresponding to the first joint surface and attached to the first housing such that the first joint surface and the second joint surface face each other. Body,
A packing disposed between the first joint surface and the second joint surface;
Each of the first joint surface and the second joint surface is provided with a protrusion so as to surround the opening,
The packing is pressed by the protrusion provided on the first joint surface and the second joint surface when the first housing is attached to the second housing. The housing structure of medical electronic equipment.   The medical electronic device according to claim 1, wherein the packing is arranged to be deformable in a direction along the first joint surface and the second joint surface when pressed by the protrusion. Enclosure structure.   The packing has a frame shape, and is arranged so that at least one of the inner side surface and the outer side surface has a gap with the first casing and the second casing, and is pressed by the protrusion. The housing structure for a medical electronic device according to claim 2, wherein the housing structure is deformable in a direction along the first joint surface and the second joint surface.   The thickness of the packing is smaller than the interval between the first joint surface and the second joint surface generated when the second housing is attached to the first housing, and is smaller than the spacing between the protrusions. The housing structure of the medical electronic device according to any one of claims 1 to 3, wherein the housing structure is also large.   5. The vertical cross-sectional shape of the protrusion provided on the first bonding surface and the protrusion provided on the second bonding surface are different at opposite positions. The housing structure of the medical electronic device according to Item.   A vertical cross-sectional shape of the protrusion is a triangular shape or a trapezoidal convex shape with a joint surface provided with the protrusion as a base, and the protrusion provided on the first joint surface and the second joint 6. The housing structure of a medical electronic device according to claim 5, wherein the protrusion provided on the surface has a vertical cross-sectional shape having different oblique sides.   The case structure of the medical electronic device according to any one of claims 1 to 6, wherein the protrusion includes one continuous linear protrusion that is not continuous in a length direction.   The said protrusion provided in the same joining surface is comprised so that the perimeter of the said opening part may be enclosed by the continuous some linear protrusion. Housing structure for medical electronic devices.   The medical electronic device casing structure according to any one of claims 1 to 6, wherein the protrusions provided on the same joint surface are constituted by a plurality of protrusions including continuous linear protrusions. .   The medical electronic device which has the housing structure of the medical electronic device of any one of Claim 1 to 9.

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