JP3731183B2 - Contact pressure blood flow sensor - Google Patents

Description

[0001]
[Industrial application fields]
This invention is an external pressure applied to a living body by a futon or clothes. In other words, the effect of body pressure and restraint pressure on the skin is to be observed in the bloodstream. For example, in the age of aging, bedsore prevention measures for bedridden elderly people are an increasingly important social problem, and it is necessary to know scientifically. The primary cause of the bedsore is that the pressure on the skin inhibits skin blood flow. The relationship between sleeping time, weight, posture, biological symptoms, bedding elasticity, and structure is related to prevention. For that purpose, it is necessary to know the pressure that the blood flow inhibits, and the value varies depending on the subcutaneous tissue. Therefore, as prevention, it is called pressure dispersion, but it is to know the pressure value of skin blood flow inhibition at each site. To that end, measuring pressure on the skin and measuring blood flow under the skin will help to develop preventive devices such as beds, wheelchairs and mattresses. The present invention relates to these measurements.
[0002]
[Prior art]
Conventionally, contact pressure measurement and blood flow measurement have been performed by arranging the sensors side by side. That is, not the same part, but the parts near each other were measured. In the case of skin blood flow, capillary blood vessels are mainly measured. However, because the blood vessels are not evenly organized in the skin, the amount of vascular tissue may be greatly different at slightly shifted sites. In addition, each sensor has effects such as skin irritation on the thickness, hardness, and attachment method, and there is a limit to the attachment to a close part, and the accuracy may be lacking.
[0003]
[Problems to be solved by the invention]
Therefore, especially for bedsore prevention measures, it is necessary to measure the subcutaneous blood flow at the measurement site and to measure at the same site as the contact pressure directly above the skin. Analysis is possible by measuring. For example, consideration of the elasticity of bets and mattresses, ascertaining body pressure values due to posture changes, and performing preventive research, educational guidance, and design of equipment structure and functions based on the data. Also, contact pressure values and skin blood flow changes are regarded as important in the evaluation of the feeling of use of these tools. Therefore, it is ideal that the contact pressure and blood flow are performed at the same site so that the mutual sensors are not affected, and a thin and flat integrated type with little discomfort is attached.
[0004]
[Means for Solving the Problems]
In the present invention, the contact pressure gauge is used for measuring the contact pressure of a soft surface, and the reproducibility and accuracy of the measured value can be confirmed by calibration. In recent years, patents including measurement and calibration have been obtained. As the blood flow meter, a semiconductor laser blood flow meter that has been conventionally used as a medical device is used. This was achieved by using a highly reliable measurement method in each of these new and old forms, making use of each measurement function, and incorporating each sensor into one.
[0005]
[Action]
The present invention includes a tube 3 that leads to a pressure gauge in FIG. 1, the entire bag is flat so as not to change the contact environment as much as possible, and the measurement surface does not expand due to compression, so that the same surface portion is maintained. Two optical fibers 2 for receiving and emitting light that are guided to the laser blood flow meter are fixed to the center of the bottom surface inside the bag with a fixing material 4 inside a transparent bag 1 made of a flexible material with little expansion and contraction. At this time, consider making the entire bag thinner. When using the contact pressure blood flow sensor, as shown in FIG. 10, a fluid such as air that does not compress the optical fiber 2 during pressurization is placed in the transparent bag 1, and the tube is connected to the pressure gauge. Connect to the laser blood flow meter. The contact pressure blood flow sensor is attached to the skin with the holed double-sided tape 18 with the surface on which the optical fiber 2 is fixed facing the living body. In order to prevent the sensor from coming off due to slippage or slipping, the adhesive film 14 is firmly attached to the living body 15 with the adhesive tape 17 so as to cover the bag. In this state, for example, when the living body is laid on the bedding 16 in FIGS. The contact pressure is received by compressing a fluid such as air confined in the flat transparent bag 1. The pressure is measured by a pressure gauge connected through the tube 3 to which the compressive force is connected. At the same time, the skin blood flow is equilibrated and transmitted through the transparent material by the laser light emitted from the laser blood flow meter by the optical fiber 2 fixed to the transparent material surface in the center of the bag, and the skin of the living body 15 Light is scattered in the tissue. A part of it is received by an optical fiber and measured. Therefore, simultaneous measurement of contact pressure and skin blood flow at the same site is possible.
[0006]
【Example】
The embodiment of the present invention will be described with reference to the drawings. In FIG. 1, a laser blood flow meter is connected to the inside of a flat, flexible and transparent bag 1 connected to a tube 3 connected to a pressure gauge. Wire the optical fiber 2. A contact pressure blood flow sensor having its end fixed with a bending fixing material 4 so as to be perpendicular to the inner surface of the bag. In FIG. 2, the optical fiber 2 is irradiated with laser light 8 perpendicularly to the inner surface of the bag by utilizing the refraction of the prism 5 so as to receive light. In the case of the opaque bag 6 in FIG. 3, an opening 7 is provided, the opening 7 is closed with a transparent material 9 made of a thin film or a thin plate material, and the optical fiber 2 is fixed vertically to the transparent material 9. Configured. In this case, when the sensor is attached to the living body, when the double-sided tape is affixed or peeled off, it also serves to protect the bag so as not to break the bag. In FIG. 4, when the transparent bag 1 is applied to a living body, a transparent protective material 10 made of a film or a thin plate material is provided to protect the bag when the double-sided tape is applied or peeled, and durability is taken into consideration. In FIG. 5, when protected by an opaque material, the perforated protective material 11 was used. In FIG. 6, the type in which the pressure gauge measurement system can guide the pressure-receiving sensor portion to the outside of the measuring device does not include the tube 3 and the pressure sensor 12 is incorporated inside the bag. In FIG. 7, a thin surface temperature sensor 20 is provided in contact with the living body 15 and in the vicinity of the blood flow measurement site when the sensor is attached. In particular, a structure in which a hole is formed at the center in the shape of a donut and a laser beam is transmitted at the center has more accurate temperature information that changes with changes in blood flow. 8, 9, and 10, when the contact pressure blood flow sensor of the present invention is attached to a living body, it is first attached to the living body 15 with a double-sided tape 18 with holes. Then, the adhesive film 14 is attached with the adhesive tape 17 so as to cover the whole, and when the living body 15 moves or the living body 15 and the bedding 16 sink, deformation due to changes in the surface area of each other occurs. Prevention of bag destruction due to the deviation. In other words, because the inside of the bag is fluid, there is no resistance to lateral displacement, which leads to sensor breakage or breakage. To prevent this and to receive pressure as normal pressure against the skin, this is an important role in practical use.
[0007]
【The invention's effect】
The contact pressure blood flow sensor of the present invention was attached to a living body, the tube 3 was connected to a pressure gauge, the optical fiber 2 was connected to a laser blood flow meter, and each measurement was performed, as shown in FIG. The leather light is guided by the optical fiber 2 and passes through the transparent bag 1, and the scattered light 19 spreads in the skin, and a part thereof is received. On the skin, a fluid such as air sealed in a flexible and transparent bag 1 receives the external pressure of the transparent bag 1, and the internal fluid is received and guided to the tube 3 and transmitted to the pressure gauge body to measure the pressure. Thereby, the contact pressure of the skin surface of the same site | part and the measurement of the subcutaneous blood flow can be performed. Therefore, the influence on the skin can be observed in the bloodstream together with the change in the restraint pressure and the change in the contact pressure due to the posture change over time. Since the value can be calibrated with respect to this contact pressure measurement method, the pressure for inhibiting blood flow can be digitized. In addition, by providing the surface temperature sensor 20, three information can be obtained from the same part with one sensor, and measurement can be performed without attaching many types of sensors. Therefore, it can be used in a wide range of fields such as prevention of bedsores, research, evaluation, guidance, tool design and manufacture, as well as physiological effects.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of the structure of the present invention. FIG. 2 is a cross-sectional view using the prism of the present invention. FIG. 3 is a cross-sectional view using the opaque bag and transparent material of the present invention. FIG. 5 is a cross-sectional view provided with a perforated protective material of the present invention. FIG. 6 is a cross-sectional view provided with a pressure sensor of the present invention in a bag. FIG. 7 is a surface temperature of the present invention. Cross-sectional view with sensor [FIG. 8] Cross-sectional view with the adhesive film of the present invention [FIG. 9] Cross-sectional view of the state of use of the present invention [FIG. 10] Enlarged cross-sectional view of the state of use of the present invention [FIG. ] External view of the present invention [Explanation of symbols]
1 is transparent bag 2 optical fiber 3 tube 4 fixing material 5 prism 6 opaque bag 7 opening 8 leather light 9 transparent material 10 transparent protective material 11 perforated protective material 12 pressure Sensor 13 Wiring 14 Paste film 15 Living body 16 Bedding 17 Paste tape 18 Perforated double-sided tape 19 Scattered light 20 Surface temperature sensor

Claims (9)

A bag 1 stretch less flexible and light permeable with a tube 3 having an optical fiber 2 and the transparent bag 1 wired fixed to the bag inner surface, and means for attaching to a human body, the contact圧血flow sensor . The contact pressure blood flow sensor according to claim 1, wherein the optical fiber 2 is fixed to the prism 5 on the inner surface of the transparent bag 1. In the case of a flexible, opaque bag 6 with little expansion / contraction, the contact pressure according to claim 1, wherein the opening 7 is provided, the opening 7 is closed with a transparent material 9, and the optical fiber 2 is fixed to the transparent material 9. Blood flow sensor. When a flexible and opaque bag 6 with little expansion and contraction is used instead of the transparent bag 1, an opening 7 is provided, the opening 7 is closed with a transparent material 9, the optical fiber 2 is attached to the prism 5 , and the transparent material 9 The contact pressure blood flow sensor according to claim 1, wherein the contact pressure blood flow sensor is fixed to the structure. The contact pressure blood flow sensor according to claim 1, comprising a transparent protective material 10. The contact pressure blood flow sensor according to claim 1, comprising a perforated protective material 11. The contact pressure blood flow sensor according to claim 1, wherein the tube 3 is not provided and the pressure sensor 12 is provided inside the bag. 圧血flow sensor contacts of the preceding claims comprising a patch film 14 as stuck means. The contact pressure blood flow sensor according to claim 1, comprising a surface temperature sensor 20.

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