JP7009309B2 - Body pressure distribution sensor sheet for operating table - Google Patents

Description

The present invention relates to a body pressure distribution sensor sheet for an operating table that is placed on a base plate of an operating table on which a patient is placed and measures the body pressure of the patient.

Conventionally, in open surgery of a fractured part of a joint or lithotripsy of a urinary calculus, a portable radiographer or the like may be used to perform X-ray fluoroscopy of a patient during the surgery. Furthermore, in recent years, percutaneous treatment using a catheter has become widespread as a type of treatment for blood vessels and body cavities in various parts such as the heart, lungs, and brain. In such catheter treatment, the patient lying on the base plate of the operating table is continuously subjected to X-ray fluoroscopy, so that the treatment is performed while confirming the arrival site of the catheter.

By the way, in such catheter treatment, the operation may take a long time compared to the conventional open surgery of the fracture site and lithotripsy of urinary calculus, and therefore, it is on the operating table. There is concern about a new problem that disorders such as pressure ulcers are likely to occur in patients who lie in the same posture for a long time.

However, as described in Japanese Patent Application Laid-Open No. 2017-046966 (Patent Document 1), the operating table having a conventional structure is a table on which a patient is placed according to the difference in the treatment site and the type of treatment. Some have a mechanism to change the height, inclination, and position of the board, and a mechanism to check the size and position of the allowable load to prevent the patient from tipping over, but to properly adjust the patient's posture. It didn't have any features. Therefore, for the problem of occurrence of disorders such as pressure ulcers, the staff will appropriately adjust the posture of the patient before and during surgery, but there is no specific index for posture adjustment, and the staff There was a problem that I had to rely on my experience and intuition.

Japanese Unexamined Patent Publication No. 2017-046966

As described above, the present invention is a novel case of the occurrence of pressure ulcers and the like on the operating table, which has become a new concern due to the lengthening of the operation on the operating table under fluoroscopy in recent years. It has a new task of providing effective items for various problems.

First, in order to deal with the new problem of the occurrence of disorders such as decubitus on the operating table, the present inventor installed a body pressure distribution sensor on the table plate of the operating table to display the body pressure distribution status in real time. By confirming and recording, it is effective to present objective data as an index for staff to properly adjust the patient's posture before and during surgery and to take care after surgery. Based on the above, we aimed to realize a body pressure distribution sensor for operating tables. Further, in the body pressure distribution sensor for the operating table, in addition to being able to accurately detect the body pressure without impairing the flexibility of the base plate of the operating table, it adversely affects the radiography during the operation. The present invention has been completed based on a new finding that body pressure should be continuously detected even during surgery.

Here, the first aspect of the present invention is a body pressure distribution sensor sheet for an operating table that is placed on a base plate of an operating table on which a patient is placed and measures the body pressure of the patient, and is on the base plate. It is equipped with a body pressure sensor unit located in the X-ray observation area of the above, and a plurality of X-ray transmission type and flexible front side electrodes and a plurality of flexible front electrodes on each one surface of the flexible and elastic dielectric layer. By arranging the back side electrodes, a plurality of capacitance type body pressure sensor units that transmit X-rays are configured at the portions facing each other of the front side electrodes and the back side electrodes sandwiching the dielectric layer. It features a body pressure distribution sensor sheet for an operating table, which has a flexible sheet shape as a whole.

According to the body pressure distribution sensor sheet for the operating table, which has a structure according to this aspect, it is an effective and new item for the new problem of the occurrence of a disorder such as a pressure ulcer in the patient on the operating table under X-ray fluoroscopy. Can be provided. And since it is a flexible sheet as a whole, it can be used without impairing the cushioning properties of the base plate of the operating table, and the body pressure sensor part is a capacitance type that transmits X-rays. Therefore, it does not interfere with the continuous or intermittent radiography performed during the operation.

Therefore, the body pressure is continuous or intermittent at any time, for example, before or during surgery, without adversely affecting the various procedures performed on the patient on the pedestal of the operating table. It will be possible to measure the distribution and record it as needed, and the staff will check it to adjust the patient's position and use it for post-surgery care to avoid or reduce disorders such as pressure ulcers. Will be easy.

A second aspect of the present invention is the plurality of body pressure distribution sensor sheets for an operating table according to the first aspect, at positions outside the arrangement portion on the base plate for an X-ray observation region. A front-side energization path conducted to the front-side electrode and a back-side energization path conducted to the plurality of back-side electrodes are provided.

In the body pressure distribution sensor sheet for the operating table having a structure according to this aspect, the front and back energization paths that are conducted to the electrodes on the front and back to energize the measurement current, etc. are provided outside the X-ray observation region. Therefore, it becomes possible to form those current-carrying paths by using a metal paste or the like. By using metal for the current-carrying path, the current-carrying resistance can be lowered, which not only reduces the power consumption but also improves the measurement accuracy in each sensor unit. In the first aspect of the present invention, it is possible to provide an energizing path in the X-ray observation area in addition to or in place of the energizing path provided outside the X-ray observation area. For example, in addition to adopting an X-ray transmission type current-carrying path such as carbon paste, by using the electrodes constituting each sensor unit as a current-carrying path, it is possible to avoid adverse effects on the X-ray observation region.

A third aspect of the present invention is the body pressure distribution sensor sheet for an operating table according to the first or second aspect, in which a position outside the X-ray observation region on the base plate is extended toward the outer periphery. An extension portion is provided, and a measurement circuit portion for measuring the body pressure acting on the plurality of body pressure sensor portions is provided on the tip end side of the extension portion, while the front side conducted to the plurality of front side electrodes is provided. The energization path and the backside energization path conducted to the plurality of backside electrodes extend from the extension portion and are connected to the measurement circuit portion.

In the body pressure distribution sensor sheet for the operating table having a structure according to this aspect, the measurement circuit unit in which metal parts such as electric elements are used can be installed at a position sufficiently outside the X-ray observation area, and the measurement circuit can be installed. By providing a flexible sheet-shaped extension between the part and the part, a large degree of freedom in selecting the location of the measurement circuit part, such as hooking on the side of the operating table, is secured, and the space does not interfere with the operation. You can also put it in.

A fourth aspect of the present invention is the body pressure distribution sensor sheet for an operating table according to the third aspect, wherein the extension portion is provided with the front side energization path and the back side energization path with a shield layer interposed therebetween. Is what you are doing.

In the body pressure distribution sensor sheet for the operating table having a structure according to this aspect, the stray capacitance (parasitic capacitance) between the front and back current-carrying paths can be suppressed by the shield layer, and the measurement accuracy and stability are improved. obtain. Therefore, it is possible to provide a relatively long extension portion or narrow the width to make it compact while avoiding an adverse effect on the body pressure measurement performance.

A fifth aspect of the present invention is the body pressure distribution sensor sheet for an operating table according to any one of the first to fourth aspects, wherein a separate cover that at least covers the mounting portion placed on the base plate is provided. In addition to being provided, a positioning portion for relatively positioning the cover and the mounting portion in the plane direction is provided.

In the body pressure distribution sensor sheet for operating tables, which has a structure according to this aspect, the cover protects the sensor sheet, and the cover avoids the influence on the performance of the sensor sheet, while the cover provides tactile sensation, durability, and waterproofness. It is also possible to easily meet the required characteristics such as property and chemical resistance. Moreover, the occurrence of wrinkles and twists due to the misalignment between the sensor sheet and the cover can be prevented by the positioning portion, and the stable arrangement state of the sensor sheet can be maintained. For the positioning portion, for example, a locking snap, an engaging hook, or the like can be adopted, but preferably, a structure such as an adhesive tape or a hook-and-loop fastener that does not impair the flexibility is adopted.

A sixth aspect of the present invention is the front side energization path in which the positioning portion is conducted to the body pressure sensor portion and the plurality of front side electrodes in the body pressure distribution sensor sheet for the operating table according to the fifth aspect. Further, all of the backside energization paths conducted to the plurality of backside electrodes are provided in the detached portions.

In the body pressure distribution sensor sheet for an operating table having a structure according to this embodiment, it is possible to prevent the sensor unit from being damaged by the positioning unit on which a force may be concentrated.

A seventh aspect of the present invention is the body pressure distribution sensor sheet for an operating table according to the fifth or sixth aspect, wherein a separate cover is provided to cover the mounting portion placed on the base plate. At the same time, the cover has a slip prevention mechanism for suppressing sliding movement in the surface direction with respect to the base plate.

In the body pressure distribution sensor sheet for the operating table having a structure according to this aspect, by adopting a slip prevention mechanism for the cover, the base plate of the body pressure distribution sensor sheet is avoided while avoiding the influence on the performance of the sensor sheet. It is possible to prevent misalignment due to slipping on the top.

Eighth aspect of the present invention is the body pressure distribution sensor sheet for an operating table according to any one of the first to seventh aspects, wherein the front side electric circuit and the back side electric circuit are used with respect to the plurality of front side electrodes and back side electrodes. A measurement circuit unit that measures the body pressure that is conducted through and acts on the plurality of body pressure sensor units is provided, and the measurement circuit unit has a battery that supplies operating power and a measurement signal is transmitted to the outside. The wireless transmission unit is connected and provided.

The body pressure distribution sensor sheet for the operating table, which has a structure according to this aspect, avoids noise that is mixed in through a power supply circuit common to, for example, an electric knife used in an operating room by supplying operating power from a battery. This can improve the measurement accuracy and stability of the body pressure distribution. Further, by wirelessly transmitting the measurement signal, it is possible to reduce the wiring in the operating room, and it is also possible to easily avoid the entry of noise into the signal circuit by digitization or the like.

A ninth aspect of the present invention is the body pressure distribution sensor sheet for an operating table according to any one of the first to eighth aspects, wherein the front side electric circuit and the back side electric circuit are used with respect to the plurality of front side electrodes and back side electrodes. While a measurement circuit unit is provided to measure the body pressure that is conducted through and acts on the plurality of body pressure sensor units, the area provided with the plurality of body pressure sensor units is set to have a size of 800 mm × 500 mm or more. Moreover, the energization resistance value from the measurement circuit unit to each body pressure sensor unit is 3.2 kΩ or less.

According to this aspect, a body pressure distribution sensor sheet more specialized for the operating table can be realized. That is, by providing a body pressure sensor unit and providing a region where the body pressure distribution can be measured with a size of 800 mm × 500 mm or more, for example, a pressure ulcer such as an upper body in a patient placed on a base plate in a recumbent position, etc. It is possible to efficiently cover the area where the pressure ulcer is likely to occur and observe the body pressure distribution. Moreover, even in the sensor unit, which is located farthest from the measurement circuit unit in the region and has a high resistance value of the current-carrying path, the current-carrying resistance value is suppressed to 3.2 kΩ or less, so that measurement with a large current-carrying resistance can be performed. The adverse effect is prevented, and the target body pressure distribution can be performed more stably and accurately.

A tenth aspect of the present invention is the body pressure distribution sensor sheet for an operating table according to any one of the first to nine aspects, wherein X covers at least one surface of the plurality of body pressure sensor portions. A line-transmitting and flexible guard electrode is arranged.

The body pressure distribution sensor sheet for the operating table having a structure according to this aspect can prevent or reduce the mixing of environmental noise from the outside into the body pressure sensor unit, and the accuracy and stability of the measurement of the body pressure distribution can be prevented. The sex can be improved.

According to the body pressure distribution sensor sheet for the operating table having a structure according to the present invention, the body pressure distribution status of the patient can be confirmed in real time without adversely affecting the operation including X-ray fluoroscopy of the patient on the operating table. It will be possible to provide new items that are effective in preventing the occurrence of disorders such as pressure ulcers during surgery.

FIG. 1 is a plan view schematically showing the entire body pressure distribution sensor sheet for an operating table as an embodiment of the present invention, in which the relationship between the operating table base plate and the patient is exemplified. What was shown. The plan view of the body pressure distribution sensor sheet for the operating table shown in FIG. FIG. 2 is an explanatory cross-sectional view taken along the line III-III in FIG. FIG. 2 is an explanatory view of an IV-IV cross section in FIG. The exploded perspective view for demonstrating the structure of the body pressure distribution sensor sheet for the operating table shown in FIG. FIG. 3 is a sectional explanatory view corresponding to FIG. 3, showing another embodiment of the present invention.

Hereinafter, an embodiment of the body pressure distribution sensor sheet for an operating table according to the present invention will be described with reference to the drawings. It should be noted that the present invention is not limitedly interpreted by the specific description in the following embodiments.

First, FIGS. 1 to 4 show a body pressure distribution sensor sheet 10 for an operating table as an embodiment of the present invention, and in FIG. 1, the body pressure distribution sensor sheet 10 carries a patient 12. It is shown in the state of use installed on the operating table 14. It should be noted that FIGS. 1 and 2 show the electrodes and the current-carrying paths constituting the body pressure distribution sensor sheet 10 in a see-through state.

Various known operating tables 14 can be adopted without limitation. For example, the operating table 14 shown in FIG. 1 is a central plate constituting a waist plate and a back plate as a base plate 16 on which a patient 12 is placed. It includes 16a, a shoulder plate 16b, a head plate 16c, a pair of arm plates 16d and 16d, and leg plates 16e and 16e, respectively. As is well known, each of these base plates 16a to 16e is supported by a base with casters with respect to the floor, is relatively displaceable, and is also as a whole of the base plate 16. It is possible to move up and down, tilt, and move horizontally. Further, in the operating table 14, in addition to the base plates 16a to e, a body side support frame, a patient fixing strap, a positioning pad, a traction tool, an accessory support hook and a clamp to the base plate side portion, and the like are also provided. Can be equipped as appropriate.

The specific shape, size, material, etc. of the base plate 16 are not limited, and the surface on the base plate 16 on which the patient 12 is placed may be hard or may be a cushioning pad. It may be composed of. Further, the surface of the base plate 16 is generally waterproofed by a urethane coat or the like.

Further, the operating table 14 is provided with an X-ray imaging apparatus. Specifically, for example, mobile surgical X-ray television devices commercially available from multiple manufacturers as "C-arms", X-ray digital diagnostic imaging devices, X-ray angiography systems, single-plane / bi-plane devices, etc. A real-time monitoring device using X-rays may be adopted. Such an X-ray imaging apparatus generally includes an X-ray irradiation apparatus including an X-ray tube arranged on one side of a base plate 16 on which a patient 12 is placed and a fluorescence arranged on the other side. It is equipped with an X-ray receiver including a multiplying tube so that X-ray imaging of the observation site such as the treatment site of the patient 12 mounted on the base plate 16 can be displayed on the monitor in real time and data can be stored. It has become.

The body pressure distribution sensor sheet 10 of the present embodiment is arranged on the base plate 16 of such an operating table 14. The body pressure distribution sensor sheet 10 has a flexible and thin sheet shape as a whole, as shown in FIGS. 2 to 4 in the state of a single item and as shown in FIG. 5 for an exploded explanatory view of the main configuration. It is provided with a sensing area (body pressure detection area) 22 in which a plurality of body pressure sensor units 20 are set so as to cover the area where the body pressure measurement of the patient 12 is required on the base plate 16 at predetermined intervals. ing. In FIGS. 2 to 3, in order to show the internal structure in an easy-to-understand manner, each structural part is exaggerated, ignoring the vertical and horizontal directions and the dimensional ratio of each part.

More specifically, the sensing area 22 of the body pressure distribution sensor sheet 10 is provided on both sides of the front and back surfaces of the dielectric layer 30 formed of a flexible and elastic compressible sheet having a high dielectric constant. The structure is such that the front side base material 32 and the back side base material 34, which are in the form of a flexible sheet having high electrical insulation, are arranged in a sandwich shape. Further, the front side electrode 36 and the back side electrode 38 are provided on the opposite inner surfaces of the front side base material 32 and the back side base material 34, supported by the base materials 32 and 34, respectively. The front side electrode 36 and the back side electrode 38 are arranged so as to face each other with the dielectric layer 30 interposed therebetween, thereby forming a capacitance type body pressure sensor unit 20. That is, in the body pressure sensor unit 20, the dielectric layer 30 is compressed and deformed according to the degree of the body pressure of the patient 12 exerted from the outside, so that the distance between the facing surfaces of the electrodes 36 and 38 on the front and back changes. The acting body pressure is detected by utilizing the change in the capacitance accompanying it. Further, since a plurality of body pressure sensor units 20 are provided in the sensing area 22 at predetermined intervals, the body pressure distribution in the sensing area 22 can be obtained from the pressure detection results of each body pressure sensor unit 20, which is necessary. It is also possible to color-code each pressure range in real time and display it on the monitor, for example.

Here, the dielectric layer 30 is made of a soft synthetic resin or elastomer that does not hinder X-ray transmission in consideration of elasticity, load bearing resistance, dielectric constant, etc., and is in the form of a sheet covering the entire sensing area 22. It is preferably used. If the thickness or weight becomes too large, handling becomes troublesome. Therefore, for example, a foam sheet having a thickness of about 0.5 to 15 mm in an uncompressed state is preferable, and a foamed sheet whose elasticity and compressibility are enhanced by foaming is preferable. Is. Specifically, foams such as polyurethane, polyethylene, polystyrene, nylon and polypropylene can be preferably used. The elasticity of the dielectric layer can be appropriately set in consideration of the acting body pressure, detection accuracy, and the like to the extent that a change in capacitance can be detected by the planned acting body pressure.

Similar to the dielectric layer 30, the base materials 32 and 34 arranged on the front and back sides of the dielectric layer 30 are soft and have X-ray permeability and are flexible enough to be curved and deformed by the acting body pressure. It is composed of an electrically insulating sheet made of resin or elastomer. Both the base materials 32 and 34 have the same or slightly larger planar shape as the dielectric layer 30, and have a size over the entire sensing area 22. Specifically, for example, a sheet having high electrical insulation such as silicone rubber, polyethylene, or polyurethane is preferably used.

Then, the front and back surfaces supported by the base materials 32 and 34 are supported by, for example, printing or coating a conductive paste on the opposite inner surfaces of the front and back base materials 32 and 34, or by fixing a conductive film. Electrodes 36, 38 are provided. The electrodes 36 and 38 on the front and back sides show flexibility to the extent that they can be curved and deformed by the acting body pressure. For example, rubber such as silicone rubber or EPDM or soft synthetic resin such as polyethylene or polyurethane is used as a base material. , Those formed by using a conductive paste to which conductivity is imparted by blending a conductive filler are preferably used. Further, as the conductive filler, a non-metal filler that does not inhibit X-ray transmission will be adopted, and for example, a conductive carbon-based filler such as conductive carbon black, carbon nanotubes, or graphite can be preferably adopted.

In the present embodiment, as shown in the plan view of FIG. 2 and the exploded perspective view of FIG. 5, the front side electrode 36 is a view in the width direction of the central plate 16a and the shoulder plate 16b in the front side base material 32. It has a strip shape with a predetermined width extending straight in the vertical direction in 1 and 2, and is separated from each other in the left and right directions in FIGS. 1 and 2 which are the length directions of the central plate 16a and the shoulder plate 16b. A plurality of lines (11 lines at substantially constant intervals in this embodiment) are formed in parallel with each other. On the other hand, the back side electrode 38 has a strip shape having a predetermined width extending straight in the left and right directions in FIGS. 1 and 2 which are the length directions of the central plate 16a and the shoulder plate 16b in the back side base material 34. In addition, a plurality of the central plate 16a and the shoulder plate 16b are separated from each other in the vertical direction in FIGS. 1 and 2 (nine at a substantially constant interval in the present embodiment) in parallel with each other. ing.

Further, a front side protective coat layer 40 is provided on the inner surface of the front side base material 32 where the front side electrode 36 is provided so as to cover and protect the front side electrode 36, and the front side electrode 36 directly with respect to the dielectric layer 30. Contact is avoided. Similarly, in the back side base material 34, the back side protective coat layer 42 that covers and protects the back side electrode 38 is provided on the inner surface where the back side electrode 38 is provided, and the back side electrode 38 is provided with respect to the dielectric layer 30. Direct contact is avoided.

The protective coat layers 40 and 42 on the front and back surfaces are insulated from an insulating soft synthetic resin such as silicone or EPDM so as not to impair the flexibility and X-ray permeability of the base materials 32 and 34 on the front and back surfaces. The property rubber is adhered to the inner surfaces of the front and back base materials 32 and 34 provided with the front and back electrodes 36 and 38 by screen printing or the like over the entire surface, or the sheet-molded material is post-bonded. , Can be provided.

Then, the front and back base materials 32 and 34 covered with the front and back protective coat layers 40 and 42 are overlapped with the dielectric layer 30 interposed therebetween, so that a plurality of front side electrodes 36 provided on the front side base material 32 are overlapped. And a plurality of back side electrodes 38 provided on the back side base material 34 are arranged so as to intersect each other in a plan view. In particular, in the present embodiment, the front and back electrodes 36 and 38 are substantially orthogonal to each other, and each electrode 36 (38) in any one of the front and back electrodes 36 and 38 is all the other electrodes 38 (36). It is arranged so as to intersect with respect to.

As a result, at each of the facing portions (each intersecting portion) of the electrodes 36 and 38 on the front and back sides, a pair of electrodes 36 and 38 are arranged to face each other with the dielectric layer 30 interposed therebetween. The portion is the body pressure sensor portion 20. In particular, in the present embodiment, in the substantially rectangular sensing area 22 in which the front and back electrodes 36 and 38 are arranged, a total of 99 body pressure sensor units 20 are provided by the 11 front side electrodes 36 and the nine back side electrodes 38. They are arranged at approximately equal intervals.

Further, the body pressure distribution sensor sheet 10 extends in an area one size larger than the sensing area 22 provided with the body pressure sensor unit 20, and is located on the outer peripheral side of the sensing area 22 provided with the electrodes 36 and 38 on the front and back surfaces. , Front and back current-carrying paths 46 and 48 are provided which are conducted to the front and back electrodes 36 and 38.

Specifically, the front and back base materials 32 and 34 have wiring regions 49 extending to the left and lower sides in FIGS. 1 and 2 from the sensing area 22 in which the front and back electrodes 36 and 38 are formed. At the same time, an extension portion 50 extending downward from the left end portion of the lower side by a predetermined width is integrally provided. On the inner surface of the front base material 32 in the wiring region 49, the front energization paths 46 conducted to the front electrodes 36 are electrically independently formed, and the extension portion 50 extends from the wiring region 49. It extends to the terminal at the tip. Further, on the inner surface of the back side base material 34 in the wiring region 49, the back side energization paths 48 conducted to the back side electrodes 38 are electrically independently formed, and the extension portion 50 extends from the wiring region 49. It extends to the connection at the tip.

Then, a voltage applied from the outside to the body pressure distribution sensor sheet 10 is applied to the front and back electrodes 36 and 38 through the front and back energization paths 46 and 48, and each body pressure provided in the sensing area 22. A pressure signal due to energization through the sensor unit 20 is output to the outside.

The current-carrying paths 46 and 48 on the front and back do not hinder the flexibility of the body pressure distribution sensor sheet 10. For example, like the electrodes 36 and 38 on the front and back, the conductive paste is applied to the inner surfaces of the base materials 32 and 34 on the front and back. It can also be formed by printing, coating, or the like. However, in the present embodiment, since any of the energization paths 46 and 48 is provided in the region outside the sensing area 22, it is not necessary to have X-ray transparency. Therefore, it is also preferable to use a conductive paste that imparts conductivity by blending a metallic conductive filler such as silver or copper with a base material made of rubber or a soft synthetic resin. Used for. In particular, by adopting a metal-based conductive filler, the electrical resistance of the conductive paste can be reduced, so the wiring space of the front and back energization paths 46 and 48 can be reduced, and by suppressing the electrical resistance, each body pressure sensor can be reduced. It is also possible to improve the measurement accuracy by reducing the energization resistance leading to the unit 20 and the energization resistance difference between the body pressure sensor units 20.

Further, in the wiring area 49 and the extension portion 50, not only the front and back base materials 32 and 34 but also the front and back protective coat layers 40 and 42 and the dielectric layer 30 are provided so as to extend from the sensing area 22. The front and back energization paths 46 and 48 provided on the inner surfaces of the front and back base materials 32 and 34 are covered and protected by the front and back protective coat layers 40 and 42.

Furthermore, in the present embodiment, the front and back current-carrying paths 46 and 48 are provided at positions displaced from each other in the horizontal direction so as not to overlap or intersect in the projection in the sheet thickness direction, so that mutual electromagnetic interference or floating occurs. The capacity is suppressed. In particular, in the present embodiment, as shown in FIGS. 4 and 5, in the extension portion 50 in which the front and back current-carrying paths 46 and 48 are wired in parallel with each other, between the front and back current-carrying paths 46 and 48 (front and back bases). A shield layer 51 extending between the materials 32 and 34) is provided to further reduce the stray capacitance between the front and back current-carrying paths 46 and 48.

The shield layer 51 does not hinder the flexibility of the body pressure distribution sensor sheet 10, and is composed of a conductive sheet-like or film-like layer having an electromagnetic shielding effect. Specifically, for example, it can be formed by printing or coating a conductive paste in which a conductive filler is mixed with a base material such as an elastomer, and since it is provided in a region outside the sensing area 22, X It does not have to have line transparency. Therefore, it is also possible to adopt a metal foil, a metal mesh, or the like. Further, for the purpose of improving the electromagnetic shielding effect of the shield layer 51, a ground wire for externally grounding the shield layer 51 may be provided.

Further, it is desirable to adopt a separate cover 52 for the body pressure distribution sensor sheet 10 having the above-mentioned structure. The cover 52 has a bag structure slightly larger than the body pressure distribution sensor sheet 10, and the body pressure distribution sensor sheet 10 is housed in the cover 52 in a housed state. The cover 52 protects the entire body pressure distribution sensor sheet 10 by covering it, and in particular, it is possible to prevent chemicals and body fluids from directly touching the surface of the body pressure distribution sensor sheet 10.

It is desirable that the cover 52 is a soft sheet so as not to impair the flexible characteristics of the body pressure distribution sensor sheet 10 and can prevent the intrusion of chemicals and body fluids. For example, a composite sheet of drawn PTFE and nylon fiber. It can be formed of a waterproof resin sheet or the like. Further, since the cover 52 is placed directly on the surface of the base plate 16 of the operating table 14, it is desirable to adopt a slip prevention mechanism that suppresses sliding movement in the surface direction with respect to the surface of the base plate 16. .. Such a slip prevention mechanism can provide, for example, a protrusion that is locked to the base plate 16 on the surface of the cover 52, but provides a large frictional resistance to the material constituting the surface of the base plate 16. A slip prevention mechanism may be configured by adopting the indicated material on the surface of the cover 52. By covering the surface of the cover 52 with a coat layer such as a urethane coat, it is possible to modify the surface or add various functions and characteristics.

Further, when the cover 52 is adopted, the cover 52 and the body pressure distribution sensor sheet 10 are mutually in the plane direction so that the flexible body pressure distribution sensor sheet 10 does not twist or wrinkle in the cover 52. It is desirable to provide a positioning unit for positioning. Especially in the area where the body pressure distribution sensor sheet 10 is easily twisted in the cover 52 due to the action of body pressure when the body position of the patient 12 is changed, that is, in the sensing area 22 placed on the base plate 16 of the operating table 14. It is desirable to provide a positioning portion so that a mounting portion can be positioned with respect to the cover 52.

Specifically, in the present embodiment, positioning portions 54 for releasably fixing the body pressure distribution sensor sheet 10 to the cover 52 are provided at four locations around the sensing area 22. As the positioning portion 54, for example, a hook-and-loop fastener, an adhesive tape such as a double-sided tape, a stapler, a clip, a locking structure, or the like can be adopted.

Therefore, as shown in FIG. 1, the body pressure distribution sensor sheet 10 having the above-mentioned structure and covered with the cover 52 is laid at a predetermined position on the base plate 16 of the operating table 14. It is set and used for body pressure distribution detection. In particular, in the present embodiment, the sensing area 22 covers the entire region including the shoulder to the torso, and further from the buttocks to the base of the thigh, where there is a concern that a pressure ulcer or the like may occur. Specifically, the sensing area 22 of the body pressure distribution sensor sheet 10 is a substantially rectangular plane so as to cover the upper surface (surface) on which the patient 12 can be placed on the central plate 16a and the shoulder plate 16b. It is set by the shape. In particular, in the width direction of the base plate 16 (vertical direction in FIG. 1), the body pressure distribution sensor sheet 10 is arranged not only in the central portion where the patient 12 is placed but also in a substantially full width as a sensing area 22. The sensing area 22 is set in consideration of the X-ray observation area for X-ray photography not only in the vertical direction but also in the tilt direction with respect to the patient 12. The sensing area 22 does not include an area where only the energization paths 46 and 48 are provided.

However, the size and shape of the sensing area in the body pressure distribution sensor sheet 10 and the arrangement area on the base plate 16 are the parts of the patient whose body pressure should be measured in consideration of the patient, the position during the treatment, the treatment content, and the like. It can be appropriately set according to the above, and is not limited. For example, it is possible to cover the area on the base plate 16 where the body pressure distribution detection is required by using a plurality of body pressure distribution sensor sheets 10 having a small sensing area, but the body pressure distribution sensor sheet is as small as possible. It is desirable to have a sensing area of 800 mm × 500 mm or more because it is easier to handle and signal processing including identification of the body pressure detection position by covering the area required by 10.

Further, the body pressure distribution sensor sheet 10 is provided with a measurement circuit unit 56 electrically connected to a connection portion at the tip of the extension portion 50. The measurement circuit unit 56 includes a battery 58 as an external power source, applies a voltage to the front and back electrodes 36 and 38 constituting each body pressure sensor unit 20 in the body pressure distribution sensor sheet 10, and also applies voltage to each body pressure sensor. The pressure signal due to energization through the unit 20 is detected and output to the outside.

Specifically, the application of voltage to each body pressure sensor unit 20 and the detection of the pressure signal are performed on an electric circuit configured by, for example, applying an AC voltage to the body pressure sensor unit 20 constituting a capacitor. This can be done by detecting that the capacitance of the sensor unit changes depending on the degree of body pressure acting. Specifically, the acting pressure may be obtained from the phase change of the applied voltage and the detected value accompanying the capacitance change of the body pressure sensor unit 20, or the working pressure may be obtained from one electrode as a reference voltage such as ground within a predetermined time in the other electrode. The capacity of the body pressure sensor unit 20 and thus the acting pressure may be obtained from the accumulated potential of the holding voltage in. Further, for example, by configuring an RC or LC oscillation circuit including a capacitor configured by the body pressure sensor unit 20, the detection accuracy is improved by detecting the change in capacitance of the body pressure sensor unit 20 as a frequency. It is also possible.

The plurality of body pressure sensor units 20 are configured to share the front side electrode 36 and / or the back side electrode 38. However, in order to perform pressure detection processing on the plurality of body pressure sensor units 20, for example, As described in Japanese Patent Publication No. 2009-300164, a plurality of front side electrodes 36 and back side electrodes 38 are used as rows and columns, and the body pressure sensor unit 20 specified by the row and column numbers is sequentially detected. It is effective to perform the processing in a scanning manner.

Further, when performing the pressure detection process in each body pressure sensor unit 20, the difference in energization resistance due to the difference in the lengths of the energization paths 46 and 48 up to each body pressure sensor unit 20 is a measurement error or measurement. It may also contribute to defects. In order to reduce or avoid such measurement errors and measurement defects, the energization resistance value from the measurement circuit unit 56 to the body pressure sensor unit 20 of any body pressure sensor unit 20 may be 3.2 kΩ or less. desirable.

Furthermore, when the pressure signal is detected by each of the body pressure sensor units 20, a signal capable of specifying the position of the body pressure sensor unit 20 is also obtained and processed. For example, in the present embodiment, 99 body pressure sensor units 20 composed of intersections of 11 front side electrodes 36a to k and 9 back side electrodes 38a to i are arranged in a matrix on the plane of the sensing area 22. Since it is arranged two-dimensionally with an aspect, the body pressure sensor unit 20 that detects the pressure signal is the body pressure to be detected by the row number of the front side electrode 36 and the column number of the back side electrode 38. It is possible to obtain a position signal for specifying the position of the sensor unit 20 on the body pressure distribution sensor sheet 10, the position of the operating table 14 on the base plate 16, or the body part of the patient 12.

The pressure detection signal including the position signal obtained in the measurement circuit unit 56 in this way is transmitted to a display device such as an external monitor or an electromagnetic storage device. In particular, in the present embodiment, the measurement circuit unit 56 is provided with a wireless transmission unit 60, and the pressure detection signal is wirelessly transmitted from the wireless transmission unit 60 to the outside.

Then, the pressure detection signal detected by the corresponding wireless resin device is image-processed, for example, via a predetermined interface or the like, and the body pressure distribution is displayed on the monitor in real time. The mode of displaying the body pressure distribution on the monitor is not limited in any way, but for example, it is color-coded in a plurality of stages according to the pressure value, and has a grid pattern on the coordinate plane corresponding to the position of each body pressure sensor unit 20. By displaying in the area divided into, it becomes possible to visually grasp the body pressure distribution quickly and easily.

Since the body pressure distribution status displayed on a monitor or the like in this way is objective data and can be an index for identifying a site where there is a risk of pressure ulcer, for example, it is necessary to look at the body pressure distribution status. By adjusting the patient's position accordingly, it is possible to prevent the occurrence of disorders such as pressure ulcers.

Here, since the body pressure distribution sensor sheet 10 of the present embodiment has a configuration in which the sensing area 22 arranged in the region to be X-ray observed at the time of treatment has X-ray transparency, it is accompanied by X-ray observation. It is possible to continuously or appropriately perform the target body pressure distribution condition during the treatment without disturbing the treatment.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-mentioned specific description.

For example, the energization path that conducts the measurement circuit unit 56 and each body pressure sensor unit 20 may be provided extending into the X-ray observation region. By adopting a material having X-ray transparency for the current-carrying path in the X-ray observation region, it is possible to avoid adverse effects on the treatment accompanied by X-ray observation.

Further, in FIG. 1 showing the embodiment, in order to make it easier to understand, the body pressure distribution sensor sheet 10 is shown in a state of being expanded in a plane including the measurement circuit unit 56, the battery 58, and the like. Since the body pressure distribution sensor sheet 10 itself has a flexible sheet shape, for example, the tip side of the extension portion 50 is bent vertically downward at the base portion (base end portion on the sensing area 22 side) of the extension portion 50. By setting the operating table 14 to hang downward from the base plate 16, it is possible to avoid unnecessary protrusion from the base plate 16 to the outer peripheral side. Further, for the relatively heavy hard parts such as the measurement circuit part 56 and the battery 58 connected to the tip side of the extension part 50, hooks provided on the side or the lower side of the operating table 14 are used. It may be hung and supported.

Furthermore, the specific size and shape of the sensing area 22 of the body pressure distribution sensor sheet 10 and the body pressure sensor unit 20 arranged therein are not limited, and the base plate on which they are arranged is not limited. The position on 16 is also not limited. The arrangement mode, number, size, arrangement density, and the like of the body pressure sensor unit 20 can be appropriately changed. Further, in the above-described embodiment, the energizing path between the adjacent body pressure sensor units 20 and 20 is integrally formed by the front and back electrodes 36 and 38 of the body pressure sensor unit 20, but the adjacent body pressure sensor units 20 and 20 are integrally formed. It is also possible to form the energization path between 20 and 20 with a shape and material different from the electrodes of the body pressure sensor unit 20.

Furthermore, the body pressure distribution sensor sheet 10 according to the present invention is not limited to use on a body pressure acting site where pressure ulcers may occur on an operating table. For example, by arranging the sensing area of the body pressure distribution sensor sheet on the base plate where the back of the knee or the like hits on the operating table, it is possible to avoid or reduce the occurrence of problems such as nerve damage due to nerve compression during surgery. ..

Further, it is also possible to extend the front side energization path 46 and the back side energization path 48 conducted to the body pressure sensor unit 20 to the outside through an extension portion 50 provided apart from each other, whereby the front and back energization paths can be extended. The stray capacitance between the two current-carrying paths 46 and 48 can be reduced by physically separating the 46 and 48 from each other.

Further, as shown in FIG. 6, for example, in the sensing area 22 of the body pressure distribution sensor sheet 10, a guard electrode 64 may be provided so as to cover at least one of the front and back surfaces of each body pressure sensor unit 20. Is. The guard electrode 64 makes it possible to prevent or reduce the mixing of environmental noise from the outside into the body pressure sensor unit 20 of the body pressure distribution sensor sheet 10 in an operating room where many electrically operated devices are used. The accuracy and stability of pressure distribution measurement can be improved. As the guard electrode 64, any conductive sheet or film having an electromagnetic shielding effect can be adopted without impairing the flexibility of the body pressure distribution sensor sheet 10 and the X-ray transmission of the sensing area 22, for example, the front and back sides. It is also possible to form the conductive paste by printing or coating on the outer surfaces of the front and back base materials 32 and 34, or to arrange the separate sheets on top of each other, as in the case of the electrodes 36 and 38. Further, the guard electrode 64 may be arranged on the inner surface or the outer surface of the cover 52, or the cover 52 itself may have the function of the guard electrode. The guard electrode 64 may be externally grounded if necessary.

Further, it is also possible to provide a determination means for determining the quality of the measurement result of the body pressure distribution using the body pressure distribution sensor sheet 10. For example, a body pressure concentration occurs locally or a body pressure equal to or higher than the floor value is generated. It is also possible to provide a warning means to notify the outside by sound or light in a situation where the occurrence occurs in the same place for more than a predetermined time.

In addition, although not listed one by one, the present invention can be carried out in an embodiment in which various changes, modifications, improvements, etc. are added based on the knowledge of those skilled in the art, and such an embodiment is the present invention. Needless to say, all of them are included in the scope of the present invention as long as they do not deviate from the gist of the present invention.

10: Body pressure distribution sensor sheet, 12: Patient, 14: Operating table, 16: Base plate, 20: Body pressure sensor part, 30: Dielectric layer, 36: Front side electrode, 38: Back side electrode, 46: Front side energization path , 48: Back side energization path, 50: Extension part, 52: Cover, 54: Positioning part, 56: Measurement circuit part, 58: Battery, 60: Wireless transmission part, 64: Guard electrode

Claims (10)

It is a body pressure distribution sensor sheet for an operating table that is placed on the base plate of the operating table on which the patient is placed and measures the patient's body pressure.
It is equipped with a body pressure sensor unit arranged in the X-ray observation area on the base plate.
By arranging a plurality of X-ray transmission type and flexible front side electrodes and back side electrodes on each one surface of the flexible and elastic dielectric layer, each of the plurality of sides sandwiching the dielectric layer. The operating table is characterized in that a plurality of capacitance type body pressure sensor portions that transmit X-rays are configured at the opposite portions of the front side electrode and the back side electrode, and are formed into a flexible sheet shape as a whole. Body pressure distribution sensor sheet for. A front-side electric circuit conducted to the plurality of front-side electrodes and a back-side electric circuit conducted to the plurality of back-side electrodes are provided at positions on the base plate outside the portion arranged in the X-ray observation region. The body pressure distribution sensor sheet for an operating table according to claim 1. An extension portion is provided that extends the position outside the X-ray observation region on the base plate toward the outer periphery, and the body pressure acting on the plurality of body pressure sensor portions is measured on the tip end side of the extension portion. While the measurement circuit unit is provided, the front side energization path conducted to the plurality of front side electrodes and the back side energization path conducted to the plurality of back side electrodes extend the extension portion and are connected to the measurement circuit unit. The body pressure distribution sensor sheet for an operating table according to claim 1 or 2. The body pressure distribution sensor sheet for an operating table according to claim 3, wherein the extension portion is provided with the front side energization path and the back side energization path with a shield layer interposed therebetween. A claim that a separate cover that covers at least the mounting portion placed on the base plate is provided, and a positioning portion that positions the cover and the mounting portion relative to each other in the plane direction is provided. The body pressure distribution sensor sheet for an operating table according to any one of 1 to 4. 5. The fifth aspect of the present invention, wherein the positioning portion is provided at a portion where the body pressure sensor portion, the front-side energization path conducting to the plurality of front-side electrodes, and the back-side energization path conducting to the plurality of back-side electrodes are all removed. The body pressure distribution sensor sheet for the operating table described in. A claim that a separate cover is provided to cover a mounting portion placed on the base plate, and the cover has a slip prevention mechanism for suppressing sliding movement in the surface direction with respect to the base plate. Item 5. The body pressure distribution sensor sheet for the operating table according to Item 5 or 6. A measurement circuit unit for measuring body pressure that is conducted to the plurality of front side electrodes and back side electrodes through the front side energization path and the back side energization path and acts on the plurality of body pressure sensor units is provided, and the measurement circuit is provided. The body for an operating table according to any one of claims 1 to 7, wherein a battery for supplying operating power and a wireless transmission unit for transmitting a measurement signal to the outside are connected to the unit. Pressure distribution sensor sheet. While the measurement circuit unit for measuring the body pressure applied to the plurality of body pressure sensor units by being conducted to the plurality of front side electrodes and the back side electrodes through the front side energization path and the back side energization path is provided, the plurality of body pressure sensors are provided. Claim 1 in which the area provided with the body pressure sensor unit has a size of 800 mm × 500 mm or more, and the energization resistance value from the measurement circuit unit to each body pressure sensor unit is 3.2 kΩ or less. The body pressure distribution sensor sheet for an operating table according to any one of 8 to 8. The operating table according to any one of claims 1 to 9, wherein an X-ray transmission type flexible guard electrode is arranged so as to cover at least one surface of the plurality of body pressure sensor portions. Body pressure distribution sensor sheet.

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