JP2016158667A - Medical electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a medical electronic apparatus capable of securing waterproofness of a part that penetrates a housing by a simple configuration despite the configuration in which a flexible board is exposed outside the housing.SOLUTION: A medical electronic apparatus includes: a housing for accommodating electronic parts inside; a flexible board 70 that is inserted into a through-hole formed in the housing for electrically connecting the electronic parts inside the housing with external electronic parts outside the housing; and a bush member for blocking a gap between the inner peripheral surface of the through-hole and the flexible board 70 by being fitted into the through-hole in a state that the flexible board 70 is inserted, and elastically deforming.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a medical electronic device, and more particularly to a medical electronic device having a configuration in which a flexible substrate is exposed to the outside.

Conventionally, a pulse oximeter is known as a medical electronic device capable of measuring arterial oxygen saturation (SpO ₂ ) in a non-invasive manner with light. Arterial oxygen saturation is a biological parameter that represents the ratio of oxyhemoglobin to total hemoglobin in arterial blood.

  The pulse oximeter includes a probe unit that acquires a biological signal using light from a predetermined part such as a finger, a footpad, or an earlobe, and a main body unit that measures and records arterial oxygen saturation by processing the acquired biological signal And have. In recent years, as shown in Patent Document 1, a small and lightweight clip-type pulse oximeter that can be attached to a fingertip by integrating a probe portion and a main body portion is known.

  The clip-type pulse oximeter has a pair of upper and lower clip pieces that sandwich a finger as a probe portion. In this pulse oximeter, red light or infrared light is emitted from one clip of the upper and lower clips toward a finger sandwiched between the upper and lower clips, for example, using a light emitting diode, and the other clip, for example, a photodiode. The light transmitted through the finger is detected using a light receiving element such as. The pulse oximeter is a signal processing circuit in the main body that performs measurement processing of arterial blood oxygen saturation using the transmitted light detection signal, and changes the light detection level synchronized with the pulse of arterial blood in the case of red light and infrared light. Compared to the case of light, the arterial oxygen saturation is calculated from the ratio.

  As a pulse oximeter, a flexible print in which a light-emitting element and a light-receiving element are interposed between upper and lower clip pieces and wired outside the upper and lower clip pieces in terms of the function as the probe unit described above. Some are connected via a circuit board (FPC: Flexible printed circuits).

JP 2007-167184 A

  By the way, the conventional clip-type pulse oximeter has a structure in which light at the time of measurement does not leak from the measurement site of the finger or light does not enter from the outside regardless of the shape of the finger held at the time of measurement. For this reason, the structure is complicated, and in particular, the waterproof property has not been studied.

  In recent years, clip-type pulse oximeters have been actively used in home oxygen therapy, so when using them in daily life, such as toilets and washrooms, sinks There is also a risk that the water may fall due to falling or splashing on the bowl, or when eating or drinking, or due to rainfall. Therefore, there has been a demand for ensuring drip-proof properties necessary for daily life that is about the level of waterproofing even if it is not necessary to make it completely waterproof.

  The present invention has been made in view of such a point, and a medical electronic device that can ensure waterproofness of a portion penetrating the casing with a simple configuration even when the flexible substrate is exposed to the outside of the casing. The purpose is to provide.

  One aspect of the medical electronic device of the present invention includes a housing that houses an electronic component therein, a through-hole formed in the housing, the electronic component inside the housing, and the housing A flexible substrate that electrically connects external electronic components outside the substrate, and the flexible substrate is placed in the through hole in a state where the flexible substrate is inserted, and is elastically deformed to be pressed against the inner peripheral surface of the through hole. And it has the structure which has a bush member which obstruct | occludes the clearance gap between the internal peripheral surface of the said through-hole, and the said flexible substrate.

  According to the present invention, even if the flexible substrate is exposed to the outside of the casing, the waterproof property of the portion that penetrates the casing can be ensured with a simple configuration.

The perspective view of the medical electronic device of one embodiment which concerns on this invention 1 is a schematic cross-sectional view showing a main configuration of a medical electronic device according to an embodiment of the present invention. The perspective view which shows the one end part of the flexible substrate attached to the through-hole of the upper housing | casing via the bush. Sectional drawing which shows typically the flexible substrate attached to the through-hole of the upper housing via the bush Sectional view schematically showing the bush before being press-fitted into the through hole The figure which uses for description of the flexible substrate shown in FIG. Diagram showing the relationship between the through hole shape and the bush shape Sectional drawing which shows the modification of a bush typically

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view of a medical electronic device according to an embodiment of the present invention.

A home medical electronic device 10 shown in FIG. 1 is a medical electronic device according to an embodiment of the present invention. Here, in order to measure arterial oxygen saturation (SpO ₂ ) in a non-invasive manner with light. 1 is a pulse oximeter 10 as a home medical electronic device.

  The pulse oximeter 10 includes a probe unit that acquires a biological signal using light from a predetermined part such as a fingertip, a main body unit that measures and records the arterial blood oxygen saturation by processing the acquired biological signal, a battery, And is configured to be attachable to the fingertip.

  The pulse oximeter 10 has a clip-like shape, and has an upper housing 20 and a lower housing 30 that are connected to each other by a hinge portion (not shown) so as to be opened and closed.

  The upper housing 20 and the lower housing 30 are biased in a closing direction via a hinge portion in a normal state. Thereby, the pulse oximeter 10 can pinch the subject's finger M inserted in the direction of the arrow D2 into the finger insertion opening 12 between the upper housing 20 and the lower housing 30 with an appropriate force. it can.

  The upper housing 20 and the lower housing 30 constitute a probe unit. Although not shown in the figure, for example, the probe part transmits a light emitting element (for example, a light emitting diode) that emits two types of light (in this case, red light or infrared light) having different wavelengths toward the mounting site, and the mounting site. And a light receiving element (for example, a photodiode) for detecting light.

  The pulse oximeter 10 has a signal processing circuit for measuring the arterial blood oxygen saturation using the transmitted light detection signal. In this circuit, the fluctuation of the light detection level synchronized with the pulse of the arterial blood is detected. The case of red light is compared with the case of infrared light, and the arterial oxygen saturation is calculated from the ratio.

  FIG. 2 is a schematic cross-sectional view showing a main configuration of a medical electronic device according to an embodiment of the present invention.

  As shown in FIG. 2, the upper housing 20 and the lower housing 30 are hollow, and house the constituent elements 61 and 62 constituting the probe portion and the main body portion, respectively.

  The upper housing 20 and the lower housing 30 are attached to each other with screws 60 that are assembled between the box-like upper and lower cases 22, 24, 32, and 34 via gaskets 50 and 50A and screwed into the screw holes 27, respectively. Consists of. Thereby, the upper housing | casing 20 and the lower housing | casing 30 are comprised so that an internal airtightness may be improved and drip-proof property may be provided.

  When the fingertips for measuring arterial blood oxygen saturation are respectively attached to the open / close surfaces of the upper housing 20 and the lower housing 30, disturbance noise generated due to intrusion of external light into the light receiving element or the like is prevented. A disturbance preventing member such as a finger contact portion 89 is attached. The disturbance preventing member such as the finger contact portion 89 is preferably made of, for example, an elastic body and is disposed so as to extend on a surface that opens and closes in the clip-type pulse oximeter 100. In particular, it is preferable that the finger contact portion 89 has a shape corresponding to the fingertip so that the finger attached at the portion in contact with the fingertip does not shift and is made of an elastic body so as to be in close contact with the finger. Disturbance prevention members that extend along the insertion direction of the finger and prevent ambient light are provided on the open / close surfaces of the upper housing 20 and the lower housing 30. As a result, the finger inserted into the fingertip insertion opening 12 (see FIG. 1) can be clipped and attached with the upper housing 20 and the lower housing 30 in close contact with each other.

  The components 61 and 62 disposed in the upper housing 20 and the lower housing 30 are disposed on the base end side of the upper housing 20 and the lower housing 30 via a flexible substrate 70 that is partially exposed to the outside. Connected.

  The components 61 and 62 have circuit boards 61a and 62a, respectively. Connectors 65 and 66 are mounted on the circuit boards 61a and 62a, respectively. Both ends 71 and 72 of the flexible substrate 70 disposed in the upper housing 20 and the lower housing 30 are connected to the connectors 65 and 66, respectively (here, connected by press fitting).

  The flexible substrate 70 is led out through the through holes 28 and 38 formed on the base end side of the upper housing 20 and the lower housing 30 through the bushes 80 and 80A, and the central portion of the flexible substrate 70 is It is exposed to the outside of both the upper housing 20 and the lower housing 30.

  Between the flexible substrate 70 and the through holes 28, 38, bushes 80, 80 </ b> A that hermetically close the inner peripheral portions of the through holes 28, 38 and the flexible substrate 70 are provided.

  In other words, the flexible substrate 70 is led out from the through holes 28 and 38 of the upper housing 20 and the lower housing 30 through the bushes 80 and 80A.

  Note that the structure in which the other end 72 side of the flexible substrate 70 is attached to the through hole 38 of the lower housing 30 via the bush 80A is configured so that the one end 71 side of the flexible substrate 70 penetrates the upper housing 20 via the bush 80. The structure is the same as that attached to the hole 28. Therefore, only the structure for attaching the flexible substrate 70 to the through hole 28 of the upper housing 20 via the bush 80 will be described, and the description of the structure of the lower housing 30 will be omitted.

  FIG. 3 is a perspective view showing one end portion 71 of the flexible substrate 70 attached to the through hole 28 of the upper housing 20 via the bush 80. FIG. 4 shows the bush 80 in the through hole 28 of the upper housing 20. It is sectional drawing which shows typically the flexible substrate 70 attached via, and is the figure which looked at the bush 80 of the state shown in FIG. 3 from the press-fit direction.

  As shown in FIGS. 2 to 4, the bush 80 is configured to surround the flexible substrate 70 and to be airtightly fitted into the through hole 28.

  The bush 80 is formed of an elastic body such as rubber and is elastically deformed. The bush 80 is disposed around the flexible substrate 70, and is pressed (press-fitted) into the through hole 28, so that the bush 80 is in pressure contact with the inner peripheral surface of the through hole 28 and the flexible substrate 70. The gap is hermetically closed. The bush 80 is formed with a slit 81 (see FIGS. 2 and 5) that opens in the direction of press-fitting into the through hole 28. The flexible substrate 70 is inserted through the slit 81. The slit 81 may have any shape as long as the bush 80 itself is disposed around the flexible substrate 70 by inserting the flexible substrate 70. The slit 81 is partially cut along the press-fitting direction. May be. The bush 80 is preferably disposed inside the clip-type clip piece (here, the upper housing 20 and the lower housing 30), that is, on the opening / closing surface.

  As shown in FIG. 4, the bush 80 includes a base portion 82 arranged outside the through hole 28, a fitting body 83 arranged inside the through hole 28, and a tip latch arranged inside the through hole 28. Part 84. The base portion 82, the fitting main body 83, and the front end latching portion 84 are formed continuously along the longitudinal direction of the flexible substrate 70, that is, along the press-fitting direction. The slit 81 is formed through the base 82, the fitting main body 83, and the tip latching portion 84. Here, the bush 80 is integrally formed as a part of a finger contact portion 89 having a shape corresponding to a finger shape disposed in the finger insertion opening 12 by being attached to the inner side surface of the upper housing 20.

  The base 82 is larger than the outer diameter of the through hole 28, and is formed in a flange shape that latches on the opening edge on the outside of the through hole 28 when the bush 80 is fitted into the through hole 28. The base portion 82 is formed continuously with the finger contact portion 89 and is disposed on the lower surface of the upper housing 20 together with the finger contact portion 89. Attached together with the finger contact portion 89, the through-hole 28 can also be made airtight with the flexible substrate 70 inserted. The finger contact portion prevents light disturbance noise from entering, that is, prevents disturbance light from entering a sensor such as a light receiving element. Moreover, since the bush 80 is attached to the lower surface of the upper housing 20 together with the finger contact portion 89, the airtightness can be further improved. Thus, since the bush 80 is integral with the finger contact portion 89, the bush 80 functions as a disturbance preventing member that closes the through hole 28 and prevents intrusion of disturbance light. Further, when the finger contact portion 89 is assembled, the flexible substrate 70 can be airtightly attached to the upper housing 20 by press-fitting the bush 80 into the through-hole 28, and at the same time, the finger contact portion 89 is attached to the upper housing. 20 can be attached.

  The fitting body 83 is press-fitted into the through hole 28 and is fitted to the through hole 28. The front end latching portion 84 is formed at the front end of the fitting main body 83 and has a larger outer shape than the fitting main body 83. Further, when the bushing 80 is press-fitted into the through-hole 28 and is brought into a fitted state, the front end latching portion 84 projects into the housing from the through-hole 28 and surrounds the through-hole 28 on the inside edge of the housing. Hang on the part. The end of the bush 80 on the press-fitting direction side, that is, the outer surface 84a of the end on the press-fitting direction side of the tip latching portion 84 is formed in a convex shape protruding toward the tip, and is larger than the inner diameter of the through hole 28. small. Thereby, the bush 80 is easily press-fitted into the through hole 28. Thus, when the bush 80 is press-fitted into the through-hole 28, it can be easily press-fitted into the through-hole 28 along the curved surface of the front end latching portion 84 constituting the front end of the bush 80.

  The bush 80 is airtightly fitted into the through hole 28 by being press-fitted into the through hole 28 from the outside in a state where the flexible substrate 70 is inserted into the slit 81.

  That is, the bush 80 is formed corresponding to the shape of the flexible substrate 70 or the shape of the through hole 28. Here, it is desirable that the through hole 28 is a long hole and the slit 81 is also provided in a long hole shape.

  FIG. 5 is a cross-sectional view schematically showing the bush 80 before being press-fitted into the through hole 28, and FIG. 6 is a diagram for explaining the flexible substrate shown in FIG. 5.

  As shown in FIGS. 5 and 6, in the bush 80 in a normal state (a state where the through hole 28 is not fitted), the diameter of the slit 81 (opening cross section viewed in the press-fitting direction) is the outer shape of the flexible substrate 70 ( It is formed so as to be larger than the cross section viewed in the press-fitting direction. The slit 81 is formed in the bush 80 across the base 82, the fitting main body 83, and the tip hooking portion 84. Thereby, in the bush 80 in the normal state, the flexible substrate 70 can be easily passed through the slit 81, and the flexible substrate 70 is not tightened.

  FIG. 7 is a view showing the relationship between the through hole shape and the bush shape, and is a view of the through hole 28 seen in the press-fitting direction. In FIG. 7, a solid line indicates the fitting state of the fitting main body 83 of the bush 80, and a broken line indicates the fitting main body 83 of the bush 80 before fitting.

  The outer diameter of the fitting body 83 of the bush 80 in the normal state is larger than that of the through hole 28.

  That is, the size of the through hole 28 is smaller than the outer shape of the fitting main body 83, and when the fitting main body 83 is pressed from the wide surface side of the flexible substrate 70, the inner peripheral surface of the fitting main body 83 is the flexible substrate 70. It is prescribed | regulated so that it may respond | correspond to the external shape of the fitting main body 83 at the time of closely_contact | adhering with this wide surface.

  With the flexible substrate 70 inserted through the bush 80, the bush 80 is press-fitted into the through hole 28 from the outside of the upper housing 20.

  Then, the bush 80 is elastically deformed by being regulated by the inner periphery of the through hole 28, and the front end latching portion 84, the fitting main body 83, and the base portion 82 are sequentially deformed, and the front end latching portion 84 and the fitting main body 83 are changed. It is inserted into the through hole 28. When the front end latching portion 84 protrudes from the through hole 28 to the inside of the housing, the deformed state is released and restored, and the front end latching portion 84 is latched at the opening edge of the through hole 28 inside the housing. To do.

  Further, the fitting main body 83 in the through hole 28 is pressed from the outer peripheral side by the through hole 28, specifically, pressed from the wide surface side.

  Thereby, the fitting main body 83 is crushed in the thickness direction of the flexible substrate 70, and is clamped by pressing the flexible substrate 70 from the wide surface side, thereby holding the flexible substrate 70 in an airtight state.

  When the fitting main body 83 of the bush 80 into which the flexible board 70 is inserted is pressed in the thickness direction of the flexible board 70 to be crushed and deformed, the fitting main body 83 can be uniformly crushed relatively easily.

  At this time, the base 82 is in a state of being hooked to the opening edge of the through hole 28 on the outside of the housing, and the base 82, the fitting main body 83, and the tip hooking portion 84 are flexible in the through hole 28. The substrate 70 can be inserted in an airtight state.

  Further, when the fitting main body 83 is crushed by the opening edge of the through hole 28, the surplus portion moves to the tip latching portion 84 side, and the tip latching portion 84 is expanded. Thereby, the area | region where the front-end | tip latching part 84 latches with respect to the opening edge part of the through-hole 28 on the inside side of a housing | casing increases, and it becomes difficult to remove the bush 80 from the through-hole 28.

  In the present embodiment, the flexible substrate 70 that is thin, flexible, and flexible is simply inserted through the slit 81 of the bush 80, and then the bush 80 is press-fitted into the through hole 28. As a result, the flexible substrate 70 can be pressed through the bush 80 in the thickness direction, that is, the flexible substrate 70 can be brought into close contact with the flexible substrate 70 from the wide surface side. The bush 80 is fitted into the through hole 28 and simultaneously presses the flexible substrate 70 from the wide surface side that can be bent. Therefore, the flexible substrate 70 is firmly and airtightly sealed in the through hole 28 without damaging the flexible substrate 70. It can be easily installed in a state.

  For example, when a cylindrical bush is attached to the through hole in advance, it is difficult to penetrate the bush 80 with a soft part such as the flexible substrate 70 that is difficult to slip against rubber. Can not. When the bush 80 is formed, it is difficult to form a hole having the same thickness as that of the flexible substrate with a mold.

  On the other hand, in the configuration of the present embodiment, the slit 81 may be made larger than the outer shape of the flexible substrate 70 to be inserted, so that the bushing 80 can be easily formed. The site | part arrange | positioned inside can be made airtight easily. That is, even if the flexible substrate 70 is exposed to the outside of the housing (upper housing 20 and lower housing 30), the waterproofness of the portions (through holes 28 and 38) that penetrate the housing is simplified. It can be secured.

  The shape of the through hole 28 and the slit 81 is such that the fitting main body 83 crushed by the through hole 28 is crushed so as to be in close contact with the wide surface of the flexible substrate 70 in the fitting main body 83 and is airtight. Any shape may be used as long as it is sandwiched in a state. For example, as shown by the fitting body 83B of the bush 80B shown in FIG. 8, the heights of both ends 811 and 812 of the long holes 81B that are long in the width direction of the wide surface of the flexible substrate 70 (the length in the thickness direction of the flexible substrate 70). The height H1 is made smaller than the height H2 of the central portion 813 of the long hole (corresponding to the slit) 81B. Thereby, when the wide surface is crushed in the thickness direction of the flexible substrate 70, the entire surface can be suitably adhered to the flexible substrate 70.

In the medical electronic device of the present embodiment, the pulse oximeter 10 that measures and records the arterial blood oxygen saturation by processing a biological signal acquired using light from a predetermined part such as a fingertip is used. However, the present invention is not limited to this, and a finger to be inserted may be clipped, and biological information (photoelectric pulse wave, SpO ₂ or the like) may be obtained from the clipped fingertip and output to an external assumed device.

Thus, when used as a clip-type biological information acquisition sensor for acquiring biological information, the medical electronic device of the present embodiment can also be used as a sleep evaluation device including a clip-type biological information acquisition sensor.
Further, in the case of a clip-type biological information acquisition sensor, the sensor can function as a sensor that measures biological information, and the measured information can be provided so as to be communicable with the main body device by wired wireless communication.

  The embodiment of the present invention has been described above. The above description is an illustration of a preferred embodiment of the present invention, and the scope of the present invention is not limited to this. That is, the description of the configuration of the apparatus and the shape of each part is an example, and it is obvious that various modifications and additions to these examples are possible within the scope of the present invention.

  The medical electronic device according to the present invention can be applied to a pulse oximeter, etc., in a configuration in which a flexible substrate is led out from a housing, can waterproof a portion of the flexible substrate that penetrates the housing.

10 Pulse oximeter (medical electronic equipment)
12 Finger Insertion Port 20 Upper Housing 28, 38 Through Hole 30 Lower Housing 50, 50A Gasket 60 Screw 61a, 62a Circuit Board 70 Flexible Board 71 One End 72 Other End 80, 80A, 80B Bush (Bushing Member)
81 slit 81B oblong hole 82 base 83, 83B fitting body 84 tip latching portion 84a outer surface 89 finger contact portion

Claims (3)

A housing that houses electronic components inside,
A flexible substrate that is inserted through a through-hole formed in the housing and electrically connects the electronic component inside the housing and an external electronic component outside the housing;
The flexible substrate is inserted into the through hole and elastically deformed to be in pressure contact with the inner peripheral surface of the through hole, and a gap between the inner peripheral surface of the through hole and the flexible substrate. A bush member for closing
Having
Medical electronic equipment. When the bush member is press-contacted to the inner peripheral surface of the through hole and is fitted into the through hole by closing the gap, the fitting main body is disposed and fitted in the through hole; and
A tip hooking portion formed at the tip of the fitting body and projecting from the through hole toward the inside of the housing, and hooked to an opening edge of the through hole on the inside of the housing;
Having
The medical electronic device according to claim 1. The outer surface of the distal end side of the distal end latching portion is a curved surface,
The medical electronic device according to claim 2.

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