JP2017080078A - Pressure measurement chamber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure measurement chamber which is capable of suppressing occurrence of unintended wrinkles in a diaphragm membrane and is unlikely to cause decrease in the pressure measurement range.SOLUTION: The pressure measurement chamber comprises: a housing 101 including a first hard frame body 111 and a second hard frame body 112 joined opposingly to each other so as to form a cavity inside; a dome-shaped diaphragm body 121 interposed between the first frame body 111 and the second frame body 112; and a diaphragm membrane 102 with a rib 122 provided on a circumference of the membrane body 121. The rib 122 includes a positioning portion for positioning relative to the housing 101. At least one of a first flange portion 114 and a second flange portion 118 includes a guide portion for positioning of each other and a positioned portion for forming a complementary structure with the positioning portion. The positioning portion is for example a positioning protruded portion 132 which is provided on an outer edge of the rib 122 such that the rib width is different from that of other portions of the rib.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a pressure measurement chamber.

  In an extracorporeal circuit for blood such as a dialysis circuit, pressure measurement in the circulation line is indispensable. For example, if the blood pressure deviates from the set pressure in artificial dialysis, the blood cells may be damaged.

  The pressure measurement in the extracorporeal circuit is generally performed by measuring the air pressure in a drip chamber provided in the circuit. However, when blood and air come into contact with each other in the drip chamber, there is a problem that blood clots are likely to occur. For this reason, use of a pressure measurement chamber that prevents blood and air from coming into contact with each other has been studied.

  For example, there is known a pressure measuring chamber that measures the pressure in the air side chamber by dividing the chamber into two parts: a blood side chamber through which blood flows by a diaphragm membrane and an air side chamber filled with air. (For example, refer to Patent Document 1). Such a pressure measuring chamber must have a sealing property at the boundary between the diaphragm membrane and the housing so that the blood side chamber and the air side chamber do not communicate with each other. For this reason, the diaphragm membrane is fixed in a state where the entire periphery is compressed by the upper and lower housings.

JP-A-1-303155

  In the blood circuit, a portion where a positive pressure is generated and a portion where a negative pressure is generated are determined on the circuit. The pressure measurement chamber having a diaphragm membrane is displaced in advance when a positive pressure is generated, and the diaphragm membrane is displaced downward when a negative pressure is generated. Alternatively, the space of the pressure measuring chamber can be efficiently used by forming a dome shape convex toward the air chamber. However, when such a dome-shaped diaphragm membrane is employed, unintended wrinkles are often formed in the diaphragm membrane. When such wrinkles occur, there is a problem that the measurement range of blood pressure decreases by the amount of space generated by the wrinkles.

  An object of the present disclosure is to realize a pressure measurement chamber in which wrinkles are not easily formed in a diaphragm film.

  The inventor of the present application repeated experiments to solve the above problems, and as a result, wrinkles are easily formed on the dome-shaped diaphragm film, and the following knowledge was obtained. That is, since the diaphragm membrane is a soft member, the dimensional stability is poor, and the housing for housing the diaphragm membrane must have a large size so that sufficient clearance is generated with respect to the diaphragm membrane. When the clearance is large, the housing can easily compress the diaphragm membrane in a state where the diaphragm membrane is displaced. As shown in FIG. 13, when the diaphragm film 202 is compressed in a shifted state, inappropriate compression occurs in a part of the diaphragm film 202, and the diaphragm film 202 is pulled by the compression, and a part of the wrinkle 205 is formed. Will occur.

  Based on the above knowledge, the inventor of the present application has examined the edge shape of the diaphragm film and found that the above problem can be solved by positioning the diaphragm film at a suitable position with respect to the housing.

  Specifically, an aspect of the pressure measurement chamber includes a housing including a hard first frame and a hard second frame connected to face each other so as to provide a cavity therein, A dome-shaped membrane body that is disposed between the first frame body and the second frame body and divides the cavity into a blood-side chamber and an air-side chamber through which blood flows; and ribs provided around the membrane body; A first diaphragm having a first recess that forms a cavity and a first flange that surrounds the first recess, and a second frame. Has a second recess that forms a cavity together with the first recess, and a second flange that surrounds the second recess, and at least one of the first flange and the second flange is the The first frame body and the second frame body have guide portions that define the mutual positions, and the ribs are positioned relative to the housing. A positioning portion, and at least one of the first flange portion and the second flange portion has a positioned portion having a complementary structure complementary to the positioning portion, and the positioning portion has a rib width other than that of the rib. Positioning recess or positioning protrusion provided on the outer edge of the rib so as to be different from the above-mentioned part, a positioning linear part provided on the outer edge of the rib and the rib width is not constant, and either the upper or lower direction provided on the rib A positioning protrusion provided on the rib, a positioning groove provided on the rib and recessed in one of the upper and lower directions, or a positioning hole provided on the rib.

  By adopting such a configuration, the position of the diaphragm membrane relative to the housing can be stabilized, so that the generation of wrinkles of the diaphragm membrane at the time of compression can be suppressed and the reduction of the pressure measurement range can be prevented.

  In one embodiment of the pressure measurement chamber, the cavity may have a major axis, and the diaphragm membrane may have a major axis in a direction that coincides with the major axis of the cavity.

  In one aspect of the pressure measurement chamber, the positioning portion is a positioning convex portion provided on the outer edge of the rib so that the rib width is wider than the surrounding portion, and the positioning convex portions face each other with the diaphragm film interposed therebetween. It can be formed in position. In this way, it is possible to suppress the occurrence of displacement of the diaphragm film with a simple structure.

  In one aspect of the pressure measurement chamber, the positioning portion may be a positioning linear portion provided on the outer edge of the rib, and at least two positioning linear portions may be provided so as to intersect with each other on the extension line. . In this way, it becomes easy to fit the rib into the rib housing groove.

  In addition, the positioning part is a positioning protrusion provided on the rib that protrudes in either the upper or lower direction, a positioning groove provided on the rib that is recessed in either the upper or lower direction, or a positioning hole provided on the rib. The positioning protrusion, the positioning groove, or the positioning hole can be formed in a square shape. If it does in this way, processing of a rib will become easy.

  In addition, the positioning portion includes positioning recesses or positioning protrusions provided on the outer edge of the rib so that the rib width is different in the peripheral portion, positioning linear portions provided on the outer edge of the rib, and upper and lower provided on the rib. It is possible to use a combination of two or more of a positioning protrusion protruding in one direction, a positioning groove recessed in one of the upper and lower directions provided on the rib, and a positioning hole provided on the rib.

  According to the pressure measurement chamber of the present disclosure, in the compression process when the diaphragm membrane and the housing are fixed, the generation of unintended wrinkles in the diaphragm membrane can be suppressed, and the pressure measurement range does not easily decrease. A chamber can be realized.

It is a disassembled perspective view which shows the chamber for pressure measurement which concerns on this embodiment. It is sectional drawing in the II-II line of FIG. It is a perspective view which shows the modification of a positioning part. It is a perspective view which shows the modification of a positioning part. It is sectional drawing in the VV line of FIG. It is sectional drawing which shows the modification of a positioning part. It is a perspective view which shows the modification of a positioning part. It is a top view which shows the diaphragm film | membrane which concerns on a modification. It is a perspective view which shows the modification of a positioning part. It is a perspective view which shows the modification of a positioning part. It is sectional drawing which shows the modification of a rib accommodating part. It is sectional drawing which shows the modification of a guide part. It is a perspective view which shows an example of the wrinkle which arises in a diaphragm film | membrane.

  As shown in FIGS. 1 and 2, the pressure measurement chamber of the present embodiment includes a first frame body 111 and a second frame body 112 that are connected to face each other so as to provide a cavity therein. 101, and a diaphragm film 102 disposed between the first frame body 111 and the second frame body 112.

  The pressure measurement chamber of the present embodiment can be used in any orientation, but in the following, the first frame 111 is on the lower side and the second frame 112 is on the upper side. explain.

  The first frame 111 includes a first recess 113 that forms a cavity, a first flange 114 that surrounds the first recess 113, and blood inlets provided at positions opposite to each other in the long axis direction. 115 and blood outlet 116. The second frame 112 protrudes upward from the second recess 117 that forms a cavity together with the first recess 113, the second flange 118 that surrounds the second recess 117, and the second recess 117. And an air port 119.

  The diaphragm membrane 102 includes a dome-shaped membrane body 121 and a rib 122 that is provided so as to surround the outer edge of the membrane body 121 and is sandwiched between the first flange portion 114 and the second flange portion 118. ing. When the diaphragm film 102 is sandwiched between the first frame body 111 and the second frame body 112, the cavity is separated into two parts by the diaphragm film 102, and blood flows on the first frame body 111 side. It becomes the blood side chamber 105, and the second frame 112 side becomes the air side chamber 106 filled with air. The pressure change in the blood side chamber 105 is transmitted to the air side chamber 106 through the membrane body 121. The pressure change in the air side chamber 106 can be detected by a pressure sensor or the like connected to the air port 119.

  The first frame body 111 and the second frame body 112 constitute a rib housing portion 131 that houses the rib 122 between the first flange portion 114 and the second flange portion 118. On the inner surface constituting the rib housing portion 131 of the second flange portion 118, there is provided a compression projection 135 that is a compression portion that compresses the rib 122 over the entire circumference. The outer surface 141 of the first collar 114 and the inner surface 142 of the second collar 118 are fitted together to define the positions of the first frame body 111 and the second frame body 112. It functions as a guide part to match. Since the first frame body 111 and the second frame body 112 are formed of a hard material, they can be aligned with each other with high accuracy.

  The rib 122 has a positioning protrusion 132 that protrudes from the rib 122 to the opposite side (outward direction) from the membrane body 121. The portions other than the positioning convex portion 132 of the rib 122 have a constant rib width, and have a shape in which the outer edge and the inner edge correspond to each other. The positioning convex portion 132 of the rib 122 is wider than the portion other than the positioning convex portion 132. The positioning convex part 132 functions as a positioning part that defines the position of the rib 122 in the rib housing part 131. The rib accommodating portion 131 has a positioning recess 133 that is recessed outward, which is a positioning portion complementary to the positioning protrusion 132.

  In the present embodiment, the cavity formed by the first recess 113 and the second recess 117 is a planar ellipse and has a major axis and a minor axis. The blood inlet 115 and the blood outlet 116 are provided at positions opposite to each other in the long axis direction of the cavity. For this reason, the blood flowing in from the blood inlet 115 flows in the blood side chamber 105 in almost one direction toward the blood outlet 116, and is less likely to stay compared to the planar circular blood side chamber 105. Is unlikely to occur. However, the blood inlet 115 and the blood outlet 116 may be provided at a position where blood flows in a U-shape or L-shape in the cavity.

  The planar shape of the cavity can be a shape having a long axis, but from the viewpoint of making retention less likely, it is preferable to have a shape with no corners or straight portions, such as a planar elliptical shape. .

  In the present embodiment, the diaphragm membrane 102 has a three-dimensional dome shape with the membrane body 121. The membrane body 121 is disposed so as to protrude downward in the positive pressure measurement pressure chamber, and is disposed so as to protrude upward in the negative pressure measurement pressure chamber. Thus, by specializing in the positive pressure measurement and the negative pressure measurement, the pressure measurement chamber can be downsized as compared with the flat diaphragm membrane. Moreover, since there is no unevenness | corrugation, a corner | angular part, or a linear part in the inner surface of the film | membrane main body 121, and the whole is formed in the curved surface, the advantage that a stagnation of blood does not arise easily is also acquired. The outer edge of the film body 121 (the inner edge of the rib 122) is circular (more specifically, elliptical). If the diaphragm membrane 102 is not wrinkled in the membrane body 121 before use, the pressure measurement range becomes a range designed in advance.

  In the present embodiment, the rib 122 surrounding the outer edge of the membrane main body 121 is provided with a positioning convex portion 132 that is a positioning portion, and the rib accommodating portion 131 has a positioning convex portion at a position corresponding to the positioning convex portion 132. A positioning recess 133 having a complementary structure having a shape complementary to the portion 132 is provided. By aligning the positioning convex portion 132 that is the positioning portion provided on the rib 122 with the positioning concave portion 133 that is the positioning portion provided on the rib housing portion 131, the diaphragm film 102 can be easily positioned with respect to the housing 101. Therefore, the occurrence of misalignment can be suppressed.

  When the diaphragm film 102 is assembled to the housing 101, if a displacement occurs, the compression parts (annular minute protrusions) provided in the first flange part 114 and the second flange part 118 are formed on the rib 122 of the diaphragm film 102. The inner edge may be compressed, or a part of it may be compressed excessively. In this case, wrinkles are generated in the main body 121 of the diaphragm film 102, and the pressure measurement range is reduced by the space generated by the wrinkles. In the present embodiment, since the position of the diaphragm film 102 with respect to the housing 101 can be positioned at a predetermined position, it is difficult for displacement to occur, and these problems are unlikely to occur.

In this embodiment, although the example which provided the positioning convex part 132 in two places on the opposite side of the major axis direction was shown, the position which provides the positioning convex part 132 is not limited. Moreover, although the positioning convex part 132 showed the example which is planar rectangular shape, the positioning convex part 132 may be what kind of planar shape, for example, it shall be planar planar shape, planar rectangular shape, planar semicircle shape etc. Can do. Moreover, an irregular planar shape may be sufficient. This is because the positioning convex portion 132 is smaller in size than the entire film, so that the dimensional error is small and the dimensional accuracy necessary for alignment can be realized even with a soft member. For example, the area of the diaphragm film 102 can secure the pressure measuring range required for a typical dialysis treatment 200mm ² ~2000mm ^2, preferably about a 500mm ² ~1000mm ² about. In contrast, the area of the projection is 0.5mm ² ~50mm ^2, preferably about a ^{1 mm} 2 to 10 mm ² approximately.

  However, it is preferable to use a planar angular shape because the moldability is improved and the required dimensional accuracy is more easily realized. The positioning convex portion 132 is not limited to two locations, and may be one location or three or more locations. When the positioning protrusions 132 are provided at two locations, it is preferable that the positioning protrusions 132 be provided evenly on the outer edge portion of the rib 122 because alignment is easy. The to-be-positioned recess 133 having a complementary structure with the positioning portion may be provided corresponding to the positioning protrusion 132.

  As shown in FIG. 3, the positioning part is a positioning concave part 132 </ b> A that is recessed inward and has a narrower rib width than other parts of the rib 122, and the positioning part is a positioning convex part 133 </ b> A that protrudes inward. You can also. In FIG. 3, the second frame body 112 is not shown for explanation. Also in this case, the position, shape, number, etc. of the positioning recess 132A can be set in the same manner as the positioning protrusion.

  As shown in FIGS. 4 and 5, the positioning portion is a positioning hole 132 </ b> B provided in the rib 122, and the positioning projection 133 </ b> B serving as the positioning portion is provided outside the compression portion (annular microprojection) on the flange 131. I can. In this case, the positioning projection 133B provided in the rib housing portion 131 has a planar shape complementary to the positioning hole 132B and is inserted into the positioning hole 132B.

  In FIG. 4, the positioning hole 132 </ b> B and the positioning projection 133 </ b> B are planar triangles, but other shapes can also be used. When the planar shape of the positioning hole 132B and the positioning protrusion 133B is circular, two or more sets of the positioning hole 132B and the positioning protrusion 133B are set so as not to cause an angular shift in the diaphragm film 102. It is preferable to provide the diaphragm film 102 with other positioning means. When the planar shape of the positioning hole 132B and the positioning projection 133B is a shape other than a circular shape, the orientation is limited when the positioning projection 133B is fitted into the positioning hole 132B, so the positioning hole 132B and the positioning projection 133B are positioned. Positioning can be performed easily even if there is only one pair with the protrusion 133B. In particular, the planar shape of the positioning hole 132B and the positioning projection 133B is preferably a shape having three or more sides. In the case where a plurality of sets of the positioning holes 132B and the positioning protrusions 133B are provided, it is preferable that they are provided as equally as possible. The positioning protrusion 133B only needs to be formed on the flange, and can be provided on the first frame 111 side, the second frame 112 side, or both. The positioning portion may not be a hole penetrating the rib 122 but may be a hole or groove that does not penetrate, and as shown in FIG. 6, the positioning portion is a positioning projection 132C and the positioned portion is complementary to the positioning projection 132C. It is good also as a typical positioned hole 133C. The positioning protrusion 132C may protrude toward the first flange 114 (upper) or may protrude toward the second flange 118 (lower). Further, a convex portion is provided on one of the first flange portion 114 and the second flange portion 118, and a concave portion is provided on the other side to form a positioned portion, and one of the ribs 122 is arranged so that the positioning portion is along the positioned portion. It can also be set as the structure which the recessed part produced in the surface and the convex part produced in the other surface.

  As shown in FIGS. 7 and 8, the positioning portion is a positioning linear portion 132D in which the outer edge of the rib 122 is linear, and the complementary structure that is the positioned portion is the positioning linear portion of the rib 122 in the rib housing portion 131. It can also be a positioned linear part 133D provided at a position corresponding to 132D. Since the linear portion has better dimensional stability than the curved portion, the required clearance can be reduced. As described above, the rib 122 and the rib receiving portion 131 corresponding to the rib 122 and the rib receiving portion 131 corresponding to the rib receiving portion 131 are provided with the positioning linear portion 132D and the rib receiving portion 131 corresponding to the rib receiving portion 131. Compared to the case of the shape, the alignment of the diaphragm film 102 can be performed with high accuracy.

  7 and 8, only the rib 122 is linear, and the outer edge of the membrane body 121 (inner edge of the rib 122) has a circular shape consisting of only a curved line having no linear portion. . That is, the outer edge of the membrane body 121 (the inner edge of the rib 122) and the outer edge of the rib 122 have different shapes. For this reason, the rib width is not constant in the positioning linear portion 132D, and the rib width of the positioning linear portion 132D corresponds to the outer edge and inner edge of the rib 122 other than the positioning linear portion 132D. It is different from the rib width of the part.

  The positioning linear portion 132D may be provided at any part of the outer edge of the rib 122. However, as shown in FIGS. 7 and 8, three or more positioning linear portions 132D are provided, and adjacent ones thereof are extended lines thereof. Are preferably crossing each other. By making the extension lines cross each other, positioning is easy in both the major axis direction and the minor axis direction. Further, the overall shape of the outer edge of the rib 122 may be a polygonal shape such as a square shape. 7 and 8, four positioning linear portions 132D are provided, but there may be three or five or more.

  As shown in FIG. 9, when there are two positioning linear portions 132D, the two positioning linear portions 132D may be parallel to each other. Positioning is facilitated by the provision of the two linear portions 132D that are parallel to the opposing positions across the membrane body 121. In this case, the position where the two positioning linear portions 132D are provided is not particularly limited, but it is preferably provided at two locations intersecting the long axis from the viewpoint of facilitating alignment.

  A plurality of positioning parts and positioned parts may be combined. For example, as shown in FIG. 10, the positioning linear portion 132D and the positioning hole 132B can be combined. In FIG. 10, the positioning linear portions 132 </ b> D are provided at two positions so as to be parallel to each other. It can also be one place. Although the planar shape of the positioning hole 132B and the positioning projection 133B is circular, it may be other shapes. The numbers of the positioning holes 132B and the positioning protrusions 133B are not particularly limited. Furthermore, not only the combination of the positioning linear portion and the positioning hole, but also the various positioning portions described above can be freely combined.

  The diaphragm film 102 can be formed of a flexible material, for example, various rubber materials such as silicon rubber, natural rubber, butyl rubber, isoprene rubber, butadiene rubber, and styrene-butadiene rubber, polyurethane, polyester, Various thermoplastic elastomers such as polyamide, olefin, and styrene, as well as polyvinyl chloride, polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, cross-linked ethylene-vinyl acetate copolymer, etc. Polyolefin, polyester such as polyethylene terephthalate, polyurethane, and soft resin such as polyamide can be used.

  In the present embodiment, an annular compression projection 135 serving as a compression portion is provided in a portion constituting the rib accommodating portion 131 of the first flange portion 114 and the second flange portion 118, and the rib 122 is compressed by the annular protrusion. However, it is only necessary to realize a sealing property that does not allow the blood side chamber 105 and the air side chamber 106 to communicate with each other. For example, the compression unit may be a plurality of independent protrusions. Further, the protrusion can be provided on the first flange portion 114 side, or can be provided on both the first flange portion 114 and the second flange portion 118. The first collar part 114 and the second collar part 118. It is also possible to sandwich the rib 122 with one being a recess and the other being a projection. Furthermore, it is good also as a specification which makes the 1st collar part 114 and the 2nd collar part 118 which comprise the rib accommodating part 131 into a plane, and compresses and sandwiches the rib 122 only by a plane.

  In this embodiment, the rib accommodating portion 131 is formed by forming a groove portion on the first flange portion 114 side. However, as shown in FIG. 11, the groove portion is provided on the second portion field portion 118 side. Alternatively, the rib housing part 131 may be formed. Further, the rib accommodating portion 131 may be formed by providing a groove portion in both the first flange portion 114 and the second flange portion 118.

  In the present embodiment, an example in which the outer side surface 141 of the first flange portion 114 and the inner side surface 142 of the second flange portion 118 are the guide portions has been described. However, the first frame body 111 and the second frame As long as the body 112 can be aligned with each other, the guide portion may have any configuration. For example, as shown in FIG. 12, a guide convex portion 143 is provided on the first flange portion 114, and a guide concave portion 144 that engages with the guide convex portion 143 is provided on the second flange portion 118. May be formed. The guide convex portion 143 and the guide concave portion 144 may be provided over the entire circumference of the first flange portion 114 and the second flange portion 118, or may be provided only in a part thereof. The concave portion and the convex portion can be interchanged. Moreover, you may use together the structure which an outer surface and an inner surface fit.

  The volume and pressure of the air-side chamber 106 are changed by changing the dome-shaped membrane body 121 so that the membrane body 121 is reversed in accordance with the pressure change. Note that there is no difference in properties between the diaphragm membrane 102 used in the positive pressure measurement pressure chamber and the negative pressure measurement pressure chamber, and at the time of manufacture, the diaphragm membrane 102 is matched to the positive pressure measurement or negative pressure measurement. After adjusting the orientation of the dome, the diaphragm membrane 102 and the housing 101 may be fixed.

  The material of the first frame body 111 and the second frame body 112 is not particularly limited as long as the material has a certain degree of rigidity, but if it is formed of a transparent material, blood flow can be easily confirmed. For example, polycarbonate resins such as polycarbonate, polyethylene terephthalate, glycol modified polyethylene terephthalate, and glycol modified polyester, olefin resins such as polyethylene and polypropylene, vinyl chloride resins, polystyrene resins, acrylic resins, acrylonitrile / styrene copolymer resins, Polyether sulfone resin, polysulfone resin, and the like can be used. Only one of the first frame body 111 and the second frame body 112 may be transparent, and a transparent window portion may be provided instead of making the whole transparent. Further, the first frame body 111 and the second frame body 112 may be opaque.

  A blood circuit tube is connected to the blood inlet 115 and the blood outlet 116. Further, the air port 119 may be directly connected to a port of the pressure measuring device, or a tube is connected to the air port 119, and a connector at the end of the tube is connected to a port of the pressure measuring device. It may be a specification. The pressure measurement device may be incorporated in an artificial dialysis device or the like, or may be a stand-alone device.

  The pressure measurement chamber of the present embodiment can be connected to a blood extracorporeal circuit for artificial dialysis, artificial liver, or heart-lung machine, and blood pressure can be measured.

  The pressure measurement chamber of the present disclosure can be realized as a pressure measurement chamber capable of measuring blood pressure in a non-contact state between blood and air, and is useful as a pressure measurement chamber connected to a blood circuit or the like.

DESCRIPTION OF SYMBOLS 101 Housing 102 Diaphragm membrane 105 Blood side chamber 106 Air side chamber 111 1st frame body 112 2nd frame body 113 1st recessed part 114 1st collar part 115 Blood inflow port 116 Blood outflow port 117 2nd recessed part 118 Second flange 119 Air port 121 Membrane body 122 Rib 131 Rib accommodating portion 132 Positioning convex portion 132A Positioning concave portion 132B Positioning hole 132C Positioning projection portion 132D Positioning linear portion 133 Positioned concave portion 133A Positioning convex portion 133B 133C Positioned hole 133D Positioned linear portion 135 Compression protrusion 141 Outer side surface 142 Inner side surface 143 Guide convex portion 144 Guide concave portion

Claims (6)

A housing including a rigid first frame and a rigid second frame connected to face each other to provide a cavity therein;
A dome-shaped membrane body disposed between the first frame body and the second frame body and dividing the cavity into a blood side chamber through which blood flows and an air side chamber; and around the membrane body A soft diaphragm film having a provided rib,
The first frame has a first recess that forms the cavity, and a first flange that surrounds the first recess,
The second frame has a second recess that forms the cavity together with the first recess, and a second flange that surrounds the second recess,
At least one of the first flange portion and the second flange portion has a guide portion that defines the position of the first frame body and the second frame body,
The rib has a positioning portion for positioning with respect to the housing,
At least one of the first collar part and the second collar part has a positioned part that forms a complementary structure complementary to the positioning part,
The positioning portion is a positioning recess or positioning projection provided on the outer edge of the rib so that the rib width is different from other portions of the rib, and a positioning linear shape provided on the outer edge of the rib, and the rib width is not constant. A positioning projection provided on the rib and projecting in either the upper or lower direction, a positioning groove provided on the rib or recessed in either the upper or lower direction, or a positioning hole provided on the rib. A pressure measurement chamber. The cavity has a major axis;
The pressure measurement chamber according to claim 1, wherein the diaphragm membrane has a major axis in a direction coinciding with a major axis of the cavity.   The positioning part is a positioning convex part provided on the outer edge of the rib so that the rib width is wider than the other part of the rib, and the positioning convex part is formed at a position facing each other across the diaphragm film. The pressure measurement chamber according to claim 1, wherein the pressure measurement chamber is provided.   The said positioning part is a positioning linear part provided in the outer edge of the said rib, The said positioning linear part is provided at least 2 so that it may mutually cross | intersect on an extension line, The Claim 1 or 2 Pressure measurement chamber. The positioning portion is provided on the rib, the positioning protrusion protruding in either the upper or lower direction, the positioning groove provided in the upper or lower direction provided on the rib, or provided on the rib. Positioning holes,
The pressure measuring chamber according to claim 1, wherein the positioning protrusion, the positioning groove, or the positioning hole has a square shape.   The positioning portion is provided on a positioning concave portion or positioning convex portion provided on an outer edge of the rib so that a rib width is different in a peripheral portion, a positioning linear portion provided on an outer edge of the rib, and the rib. It is a combination of two or more of a positioning protrusion that protrudes in either the upper or lower direction, a positioning groove that is recessed in any of the upper or lower direction provided on the rib, or a positioning hole that is provided on the rib. The pressure measuring chamber according to claim 1 or 2.

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