Seat for carrying out a recording of a cerebral activity of a fetus in a mother's womb
The seat design with multiple supports and a concave probe support addresses the discomfort and inaccuracy issues in fetal magnetoencephalography by ensuring stable, comfortable maternal positioning for prolonged recordings.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- INST NAT DE LA SANTE & DE LA RECHERCHE MEDICALE (INSERM)
- Filing Date
- 2026-01-20
- Publication Date
- 2026-07-23
AI Technical Summary
Existing fetal magnetoencephalography procedures using a belt with multiple probes are cumbersome and uncomfortable for the mother, leading to probe movement and reduced measurement accuracy due to prolonged static positioning.
A seat with multiple supports for the knees, bottom, and arms, along with a concave probe support, allows the mother to maintain a stable and comfortable position, ensuring proper probe contact with the belly for extended recording periods.
The seat enhances maternal comfort and stability, improving the accuracy of fetal cerebral activity recordings by minimizing probe movement and allowing prolonged static positioning.
Smart Images
Figure EP2026051283_23072026_PF_FP_ABST
Abstract
Description
[0001] Seat for carrying out a recording of a cerebral activity of a fetus in a mother’s womb
[0002] The present invention concerns the field of the magnetoencephalography of a fetus before he / she is born.
[0003] It is possible to record a cerebral activity of the fetus in the mother’s womb using a belt, arranged around the belly of the mother. The belt carries probes bearing against the belly of the mother. The probe typically comprises a magnetoelectroencephalography sensor.
[0004] The belt is heavy, because a large number of probes is used for the recording.
[0005] The recording is carried out over a long period of time, for example one hour. It is advisable that the probes do not move on the body of the mother during the recording, to guarantee a good accuracy of the measurement.
[0006] The situation is uncomfortable for the mother. She must stay static for a long period, with the belt bearing heavily on her body.
[0007] As a consequence, there is a need to improve the comfort of the mother during the recording of the cerebral activity of the fetus.
[0008] This objective is achieved by a seat for carrying out a recording of a cerebral activity of a fetus in a mother’s womb, the seat comprising:
[0009] - a frame ;
[0010] - a first support for receiving knees of the mother, such that the mother can rest on her knees on the first support, the first support being located at a first height along a vertical direction ;
[0011] - a second support for a bottom of the mother, located at a second height along the vertical direction higher than the first height and located backward with respect to the first support along a longitudinal direction, such that the bottom of the mother can bear against the second support when she rests on her knees on the first support ;
[0012] - a third support for the arms of the mother, located at a third height along the vertical direction higher than the first height and located forward with respect to the first support along the longitudinal direction, such that the mother can lean on the third support using her arms when she rests on her knees on the first support ;
[0013] - a probe support, defining a concave surface against which the mother can apply her belly when she rests on her knees on the first support, the probe support being located at a fourth height along the vertical direction intermediate between the first height and the third height and being located along the longitudinal direction between the first support and the thirdsupport, the concave surface facing an oblique direction extending up along the vertical direction and backward along the longitudinal direction ;
[0014] the first support, the second support, the third support and the probe support being mounted on the frame.
[0015] The seat comprises three different supports, for the knees, for the bottom and for the arm of the mother. The mother rests on her knees, her bottom bearing on the second support. Due to the positions of the three supports, she is leaning forward, with herforearms bearing on the third support. She is in a rather stable and comfortable situation.
[0016] The position of the mother is such that her belly is turned toward the probe support and comes easily in contact with the concave surface defined by probe support.
[0017] In other words, with the seat of the invention, the mother brings her belly on the probe support. She is able to control the pressure against the concave surface.
[0018] The mother’s position is sufficiently comfortable for her to stay static for a long period, thereby improving the accuracy of the measurement.
[0019] The seat may include as well one or several of the following features, alone or in combination:
[0020] - the probe support comprises cells for receiving the probes, each cell having a proximal end defining an opening inside which a contact part of the probe is accommodated, the contact part of the probe being arranged to be in contact with the belly of the mother during the recording, the proximal ends of the cells defining the concave surface ;
[0021] - the cells are gathered in blocks, each block comprising two to ten cells rigidly connected to one another;
[0022] - the probe support comprises at least one sheet of a plastic material, with holes for receiving the cells;
[0023] - the at least one sheet of a plastic material comprises several sheets of a plastic material, connected to one another by seams;
[0024] - the probe support comprises an arcuate frame, to which the at least one sheet of a plastic material is suspended;
[0025] - the at least one sheet of a plastic material is suspended to the arcuate frame by straps, the length of the straps being preferably adjustable;
[0026] - the arcuate frame is covered by a cushioning material;
[0027] - the probe support is connected to the frame by a probe support connection arranged such that the probe support is tiltable with respect to the frame around a transverse axis, perpendicular to the longitudinal direction and to the vertical direction;- the probe support connection is arranged such that a position of the probe support with respect to the frame along another oblique direction and / or along the vertical direction is adjustable;
[0028] - the first support is connected to the frame by a first support connection arranged such that a position of the first support with respect to the frame along the vertical direction is adjustable;
[0029] - the second support is connected to the frame by a second support connection arranged such that a position of the second support with respect to the frame along the longitudinal direction is adjustable;
[0030] - the third support is connected to the frame by a third support connection arranged such that a position of the third support with respect to the frame along the vertical direction is adjustable;
[0031] - the first support and / or the second support and / or the third support is covered by a cushioning material;
[0032] - the seat is entirely made of non-metal materials.
[0033] Other features and advantages of the seat will become apparent in the detailed description given below, only as an example, in reference to the following figures:
[0034] [Fig 1] the figure 1 is a view in perspective of the seat;
[0035] [Fig2] the figure 2 is an enlarged view of the probe support of the seat of the figure 1; and [Fig 3] the figure 3 is an enlarged view of a part of the probe support of the figure 2.
[0036] The seat 1 illustrated on the figure 1 is designed for carrying out a recording of a cerebral activity of a fetus in a mother’s womb.
[0037] The seat is designed such that the mother is able to rest on the seat, in a stable and comfortable position during the recording of the cerebral activity of the fetus. In said position, her belly is oriented in a direction such that the mother can place her belly in contact with the probes recording the cerebral activity.
[0038] The seat 1 comprises:
[0039] - a frame 3;
[0040] - a first support 5 for receiving knees of the mother;
[0041] - a second support 7 for a bottom of the mother;
[0042] - a third support 9 for the arms of the mother.
[0043] The first support 5, the second support 7, and the third support 9 are mounted on the frame 3.
[0044] The frame 3 is made of wooden bars 11 , connected to one another by connectors 13 made of a plastic material such as polylactic acid (PLA).
[0045] The frame 3 is designed such that it stands on the floor in a stable position.The first support 5 is designed such that the mother can rest on her knees on the first support 5.
[0046] The first support 5 comprises two first plates 13, substantially horizontal.
[0047] The first plates 13 are spaced from one another along a transverse direction Y. The first plates 13 are made of a wooden material. The first plates 13 are for example medium density fibreboards (MDF).
[0048] The first support 5 is covered by a cushioning material 15.
[0049] More precisely, the first support has an upper surface 17 covered by the cushioning material 15. The upper surface 17 is turned upward, such as the knees on the mother rest on the cushioning material 15.
[0050] The cushioning material 15 comprises a layer of plastic foam, covered by a layer of plastic material.
[0051] The first support 5 is located at a first height along a vertical direction Z.
[0052] The first height is taken at the upper surface 17, with respect to the ground on which the seat stands.
[0053] The second support 7 is located at a second height along the vertical direction Z higher than the first height and is located backward with respect to the first support 5 along a longitudinal direction X, such that the bottom of the mother can bear against the second support 7 when she rests on her knees on the first support 5.
[0054] The longitudinal direction X is perpendicular to the vertical direction Z (figure 1). The transverse direction Y is perpendicular to the longitudinal direction X and to the vertical direction Z.
[0055] The second support 7 comprises a second plate 19, with a front face 21 and a back face 23. The front face 21 is turned forward along the longitudinal direction X and upward along the vertical direction Z. It is substantially parallel to the transverse direction Y.
[0056] In other words, an axis perpendicular to the front face 21 is included in a plane defined by the longitudinal direction X and the vertical direction Z. It is inclined upward with respect to longitudinal direction, and it is inclined forward with respect to the vertical direction.
[0057] For example, the axis perpendicular to the front face 21 forms an angle comprised between 30° and 60° with the vertical direction Z.
[0058] The second plate 19 is made of a wooden material. The second plate 19 is for example a medium density fibreboard (MDF).
[0059] The second support 7 is covered by a cushioning material 15.
[0060] More precisely, the front face 21 of the second support 7 is covered by the cushioning material 15.
[0061] The cushioning material 15 is as described above.The second height is taken at the geometrical center of the front face 21 , with respect to the floor on which the seat stands.
[0062] In the present application, the geometrical center of a surface is defined typically as the barycenter of all the points of said surface.
[0063] The second support 7 is located backward with respect to the first support 5 along a longitudinal direction X means that the geometrical center of the front face 21 is shifted along the longitudinal direction X with respect to the geometrical center of the upper surface 17, on the right on the figure 1.
[0064] The third support 9 is located at a third height along the vertical direction higher than the first height and is located forward with respect to the first support 5 along the longitudinal direction X, such that the mother can lean on the third support 9 using her arms when she rests on her knees on the first support 5.
[0065] The third support 9 comprises a third plate 25, substantially horizontal.
[0066] The third plate 25 is made of a wooden material. The third plate 25 is for example a medium density fibreboard (MDF).
[0067] The third support 9 is covered by a cushioning material 15.
[0068] More precisely, the third support 9 has an upper surface 27 covered by the cushioning material 15. The upper surface 27 is turned upward, such as the mother can lay her forearms on the cushioning material 15.
[0069] The cushioning material 15 is as described above.
[0070] The third height is taken at the upper surface 27, with respect to the floor on which the seat stands.
[0071] The third support 9 is located forward with respect to the first support 5 along a longitudinal direction X means that the geometrical center of the upper surface 27 is shifted along the longitudinal direction X with respect to the geometrical center of the upper surface 17, on the left on the figure 1.
[0072] The seat 1 further comprises a probe support 29, defining a concave surface 31 against which the mother can apply her belly when she rests on her knees on the first support 5.
[0073] The probe support 29 is located at a fourth height along the vertical direction Z intermediate between the first height and the third height and is located along the longitudinal direction X between the first support 5 and the third support 9.
[0074] The concave surface 31 faces an oblique direction A1 , extending up along the vertical direction Z and backward along the longitudinal direction X. The oblique direction A1 extends in a plane parallel to the vertical direction Z and to the longitudinal direction X.The probe support 29 comprises cells 33 for receiving the probes (not depicted on the figures).
[0075] Each cell 33 is designed to receive one probe. The probe is removably secured to the cell.
[0076] Each probe typically comprises a magnetoelectroencephalography sensor.
[0077] Each cell 33 has a proximal end 35 defining an opening 37 inside which a contact part of the probe is accommodated, the contact part of the probe being arranged to be in contact with the belly of the mother during the recording. The contact part is in direct contact with the belly of the mother, or is in contact through a film or the clothe of the mother.
[0078] The proximal ends 35 of the cells 33 together define the concave surface 31.
[0079] Each cell 33 has a tubular shape, and extends along a central axis.
[0080] In the example shown on the figure, each cell 33 has a substantially square cross section perpendicularly to the central axis. For example, the cell 33 is cubic.
[0081] The proximal end 35 is an end of the cell 33 along the central axis.
[0082] As shown on the figures 2 and 3, the cells 33 are gathered in blocks 39, each block comprising two to ten cells 33 rigidly connected to one another.
[0083] Typically, each block 39 comprises between three a six cells 33.
[0084] The respective central axis of the cells 33 in the same block are not parallel to one another. Therefore, the proximal ends 35 of the cells of the block 39 define an arcuate surface, as shown on the figure 3. Said arcuate surface is a part of the concave surface 31.
[0085] The probe support 29 comprises at least one sheet 41 of a plastic material, with holes 43 for receiving the cells 33.
[0086] The at least one sheet 41 of a plastic material comprises one hole 43 for each cell 33. The inner section of the hole corresponds to the outer cross-section of the cell 33.
[0087] The proximal end 35 of each cell 33 forms an outgoing collar 45 around the opening 37. The cell 33 is inserted into the hole 43, the outgoing collar 45 resting on the edge of the hole 43 and preventing the cell from traversing the hole 43.
[0088] Advantageously, the at least one sheet 41 of a plastic material comprises several sheets 41 of a plastic material, connected to one another by seams 47.
[0089] The sheets 41 of a plastic material are independent from one another. In other words, there is no bridge of plastic material connecting the sheets to one another and being one piece with the sheets.
[0090] The sheets 41 of a plastic material are connected to one another only by the seams 47.
[0091] The seams 47 are obtained by sewing the two sheets 41 of a plastic material together, using a thread. Each seam 47 connects respective areas of the two sheets 41 of plasticmaterial to one another. Said areas are small with regard to the total surface areas of the sheets 41 of a plastic material.
[0092] The shapes of the sheets 41 and the positions of the seams 47 are chosen such that the blocks 39 are located close to one another, with the proximal ends of the cells 33 arranged to define the concave surface 31.
[0093] The at least one sheet 41 of a plastic material is made for example of silicone.
[0094] The at least one sheet 41 of a plastic material presents a thickness chosen such that the sheet is substantially rigid. In other words, the at least one sheet 41 of a plastic material keeps its shape in absence of external forces.
[0095] For example, the at least one sheet 41 of a plastic material has a thickness of three millimeters.
[0096] The single sheet 41, or all the sheets 41 of a plastic material connected to one another, form a support 48 for the cells 33.
[0097] The support 48 has a main part 49 and an extension 51.
[0098] The main part 49 has substantially the shape of a segment of sphere. The extension has a substantially rectangular shape. The main part 49 bears the probes that will be in contact with the belly of the mother. The extension 51 is designed to extend between the legs of the mother.
[0099] In the main part, the proximal ends 35 of the cells are organized in several lines and several columns. In other words, the proximal ends 35 define a matrix. The lines comprise between five and fifteen cells. The columns comprise between five and ten cells.
[0100] The probe support 29 comprises an arcuate frame 53, to which the at least one sheet 41 of a plastic material is suspended.
[0101] The arcuate frame 53 for example has the shape of an arc, typically the arc of a circle or of an ellipse. It extends over slightly more than 180°. The at least one sheet 41 of plastic material is suspended radially inside the arc.
[0102] The arcuate frame 53 is made of a wooden material. The arcuate frame 53 is for example a medium density fibreboard (MDF).
[0103] The arcuate frame 53 is covered by a cushioning material 15.
[0104] More precisely, the upper face 54 of the arcuate frame 53 is covered by the cushioning material 15.
[0105] The cushioning material 15 is as described above.
[0106] The at least one sheet of plastic 41 is suspended to the arcuate frame 53 by straps 55.
[0107] The straps 55 are distributed around the arcuate frame 53. They are spaced from one another along the arcuated frame 53.Each strap 55 is connected to the at least one sheet of plastic 41 by a seam 57. Each seam 57 is obtained by sewing an end of the strap 55 to the at least one sheet 41 of plastic material, using a thread.
[0108] The seams 57 are distributed around the edge of the support 48.
[0109] More precisely, the seams 57 are distributed around the edge of the main part 49 of the support 48. The seams 57 are distributed along slightly more than a half of said edge.
[0110] The length of the straps 55 is preferably adjustable. Therefore, it is possible to adjust the position of the support 48 with respect to the arcuate frame 53.
[0111] The upper face 54 of the arcuate frame 53 extends in a plane. The oblique direction A1 is typically perpendicular to said plane.
[0112] The fourth height is taken at the geometrical center of the upper face 54.
[0113] The position of the probe support 29 along the longitudinal direction X is taken at the geometrical center of the upper face 54 of the arcuate frame 53. The position of the first support 5 along the longitudinal direction X is taken at the geometrical center of the upper surfaces 17 of the first plates 13. The position of the third support 9 along the longitudinal direction is taken at the geometrical center of the upper surface 27 of the third support 9.
[0114] The position of the probe support 29 along the longitudinal direction X is between the position of the first support 5 along the longitudinal direction X and the position of the third support 9 along the longitudinal direction X.
[0115] The probe support 29 is connected to the frame 3 by a probe support connection 59 arranged such that the probe support 29 is tiltable with respect to the frame 3 around a transverse axis A2.
[0116] In other words, the probe support 29 can be rotated around the transverse axis A2 with respect to the frame 3.
[0117] The probe support connection 59 is designed such that the angular position of the probe support 29 around the transverse axis A2 can be adjusted by a user, and the probe support 29 can be locked in the selected angular position with respect to the frame 3.
[0118] The probe support connection 59 for example comprised a rod defining the transverse axis A2, with a nut mounted on a threaded end of the rod to block the probe support 29 in position.
[0119] The probe support connection 59 is arranged such that a position of the probe support 29 with respect to the frame 3 along another oblique direction A3 and / or along the vertical direction Z is adjustable.
[0120] The probe support connection 59 comprises two oblique posts 61, extending along said other oblique direction A3, connected to four vertical posts 63, 63’ of the frame 3.The two posts 63 are shifted farther away from the fist support 5 along the longitudinal direction X than the two posts 63’.
[0121] The arcuate frame 53 is connected to rear ends of said oblique posts 61 and is tiltable around the transverse axis A2 with respect to the oblique posts 61 , as described above.
[0122] The position of the oblique posts 61 with respect to the frame 3 along the other oblique direction A3 is adjustable.
[0123] The position of the oblique posts 61 with respect to the frame 3 along the vertical direction Z is adjustable as well.
[0124] A set of holes is arranged at the front ends of each oblique post 61, at different positions along the other oblique direction A3.
[0125] Another set of holes is arranged in each vertical post 63, 63’ at different positions along the vertical direction Z.
[0126] Each oblique post 61 is connected to one of the vertical post 63 and to one of the vertical post 63’.
[0127] A tie rod 65 is inserted in a hole of the oblique post 61 and in a hole of the vertical post 63.
[0128] Two other tie rods 65’ secure two guide support 67 to holes of the vertical posts 63’. Each guide support 67 has an oblique through opening 69, in which one of the oblique post 61 is slidingly received.
[0129] The other oblique direction A3 extend in a plane parallel to the longitudinal direction X and the vertical direction Z. Depending on the position of the tie rods 65, 65’, the angle between the other oblique direction A3 and the longitudinal direction X is comprised between 135° and 225°, preferably between 160° and 200°, and for example is 180°.
[0130] The first support 5 is connected to the frame 3 by a first support connection 71 arranged such that a position of the first support 5 with respect to the frame 3 along the vertical direction Z is adjustable.
[0131] For example, the first support connection 71 comprises two sets of holes, arranged at different heights in two vertical posts of the frame 3, and two tie-rods connecting the first support 5 to the vertical posts. The two tie-rods can be inserted into any hole of the two sets, to adjust the height of the first support 5.
[0132] The second support 7 is connected to the frame 3 by a second support connection 75 arranged such that a position of the second support 7 with respect to the frame 3 along the longitudinal direction X is adjustable.
[0133] For example, the second support connection 75 comprises two sets of holes, arranged along two longitudinal members 77 belonging to the second support 7, and two tie-rods connecting the second support 7 to vertical posts of the frame 3. The holes are arranged atdifferent longitudinal positions along the members 77. The two tie-rods can be inserted into any hole of the two longitudinal members 77, to adjust the longitudinal position of the second support 7.
[0134] The third support 9 is connected to the frame 3 by a third support connection 79 arranged such that a position of the third support 9 with respect to the frame 3 along the vertical direction Z is adjustable.
[0135] For example, the third support connection 79 comprises four tubes 81 secured to the third support 9, and four tie-rods connecting the tubes 81 to vertical posts of the frame 3. A set of holes is arranged at different vertical positions of each tube 81. The tie-rods can be inserted into any hole of the tubes, to adjust the longitudinal position of the third support 9. The tubes are secured to the upper end of the vertical posts 63, 63’.
[0136] Advantageously, the seat 1 is entirely made of non-metal materials.
[0137] The procedure to carry out the recording of the cerebral activity of the fetus will be described below.
[0138] First, the position of the head of the baby in the mother’s womb is detected, for example by an echography.
[0139] The positions of the first support 5, the second support 7 and the third support 9 are then adjusted, to fit the size of the mother.
[0140] The position of the probe support 9 along the vertical direction and along the other oblique direction A3 is adjusted, as a function of the morphology of the mother and of the position of the baby’s head. The angular position of the probe support 9 around the transvers axis A2 is adjusted as a function of the morphology of the mother and of the position of the baby’s head.
[0141] Then, a number of probes is mounted in the probe support 9. The number of probes and their positions is chosen as a function of the position of the baby’s head. The number of probes is smaller than the number of cells in the probe support. For example, 48 probes are used, whereas the probe support comprises more than 100 cells.
[0142] The mother then sits on the seat 1. She rests on her knees on the first support 5, with her bottom laying against the second support 7. She leans forward, with the forearms resting on the third support 9. She applies her belly against the probe support 29, more precisely against the probes mounted on the probe support 29.
[0143] The recording is started when the mother is in a stable, comfortable position.
Claims
CLAIMS1. A seat for carrying out a recording of a cerebral activity of a fetus in a mother’s womb, the seat (1) comprising:- a frame (3);- a first support (5) for receiving knees of the mother, such that the mother can rest on her knees on the first support (5), the first support (5) being located at a first height along a vertical direction (Z);- a second support (7) for a bottom of the mother, located at a second height along the vertical direction (Z) higher than the first height and located backward with respect to the first support (5) along a longitudinal direction (X), such that the bottom of the mother can bear against the second support (7) when she rests on her knees on the first support (5); - a third support (9) for the arms of the mother, located at a third height along the vertical direction (Z) higher than the first height and located forward with respect to the first support (5) along the longitudinal direction (X), such that the mother can lean on the third support (9) using her arms when she rests on her knees on the first support (5);- a probe support (29), defining a concave surface (31) against which the mother can apply her belly when she rests on her knees on the first support (5), the probe support (29) being located at a fourth height along the vertical direction (Z) intermediate between the first height and the third height and being located along the longitudinal direction (X) between the first support (5) and the third support (9), the concave surface (31) facing an oblique direction (A1) extending up along the vertical direction (Z) and backward along the longitudinal direction (X);the first support (5), the second support (7), the third support (9), and the probe support (29) being mounted on the frame (3).
2. The seat according to the claim 1, wherein the probe support (29) comprises cells (33) for receiving the probes, each cell (33) having a proximal end (35) defining an opening (37) inside which a contact part of the probe is accommodated, the contact part of the probe being arranged to be in contact with the belly of the mother during the recording, the proximal ends (35) of the cells defining the concave surface (31).
3. The seat according to the claim 2, wherein the cells (33) are gathered in blocks (39), each block (39) comprising two to ten cells (33) rigidly connected to one another.
4. The seat according to the claim 3, wherein the probe support (29) comprises at least one sheet (41) of a plastic material, with holes (43) for receiving the cells (33).
5. The seat according to the claim 4, wherein the at least one sheet (41) of a plastic material comprises several sheets (41) of a plastic material, connected to one another by seams (47).
6. The seat according to the claim 4 or 5, wherein the probe support (29) comprises an arcuate frame (53), to which the at least one sheet (41) of a plastic material is suspended.
7. The seat according to the claim 6, wherein the at least one sheet (41) of a plastic material is suspended to the arcuate frame (53) by straps (55), the length of the straps (55) being preferably adjustable.
8. The seat according to the claim 6 or 7, wherein the arcuate frame (53) is covered by a cushioning material (15).
9. The seat according to anyone of the claims 1 to 8, wherein the probe support (29) is connected to the frame (3) by a probe support connection (59) arranged such that the probe support (29) is tiltable with respect to the frame (3) around a transverse axis (A2), perpendicular to the longitudinal direction (X) and to the vertical direction (Z).
10. The seat according to the claim 9, wherein the probe support connection (59) is arranged such that a position of the probe support (29) with respect to the frame (3) along another oblique direction (A3) and / or along the vertical direction (Z) is adjustable.
11. The seat according to anyone of the claims 1 to 10, wherein the first support (5) is connected to the frame by a first support connection (71) arranged such that a position of the first support (5) with respect to the frame (3) along the vertical direction (Z) is adjustable.
12. The seat according to anyone of the claims 1 to 11, wherein the second support (7) is connected to the frame (3) by a second support connection (75) arranged such that a position of the second support (7) with respect to the frame (3) along the longitudinal direction (X) is adjustable.
13. The seat according to anyone of the claims 1 to 12, wherein the third support (9) is connected to the frame (3) by a third support connection (79) arranged such that a position of the third support (9) with respect to the frame (3) along the vertical direction is adjustable.
14. The seat according to anyone of the claims 1 to 13, wherein the first support (5) and / or the second support (7) and / or the third support (9) is covered by a cushioning material (15).
15. The seat according to anyone of the claims 1 to 14, wherein the seat (1) is entirely made of non-metal materials.