CN111888007A

CN111888007A - Anesthesia fixing device

Info

Publication number: CN111888007A
Application number: CN202010812548.1A
Authority: CN
Inventors: 张帅; 赵秋芬; 宋蕾
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-08-13
Filing date: 2020-08-13
Publication date: 2020-11-06

Abstract

The invention discloses an anesthesia fixing device, which comprises a fixing bottom plate, wherein a head fixing device is fixedly arranged at the top of the fixing bottom plate, the head fixing device comprises a shell, a first cavity is formed in the shell, a first limit clamp plate and a second limit clamp plate are respectively arranged in the first cavity, arm fixing devices are symmetrically arranged on two sides below the head fixing device and comprise connecting cylinders, wrist fixing devices are fixedly arranged below the arm fixing devices and comprise fixing bases, a leg fixing structure is arranged below the wrist fixing devices, a foot fixing device is arranged below the leg fixing structure and comprises a shell, a fixing block is arranged at the bottom in the shell, a clamping plate is arranged in the shell, and an arc instep fixing groove is formed in the clamping plate, so that the anesthesia fixing device has the beneficial effects that: the device is simple in structure and convenient to use, can fix each joint of a body one by one, is not easy to loosen after being fixed, and cannot cause secondary damage to a patient.

Description

Anesthesia fixing device

Technical Field

The invention relates to the technical field of medical anesthesia, in particular to an anesthesia fixing device.

Background

Anesthesia, generally considered, is a drug or other means of reversible functional inhibition of the central and peripheral nervous systems, characterized primarily by loss of sensation, particularly pain, which is frequently used in various clinical procedures.

General anesthesia is called general anesthesia for short: the anesthetic is inhaled through a respiratory tract, injected into a body through a vein or an muscle to generate temporary inhibition of a central nervous system, and clinically, the temporary inhibition is manifested by mental disappearance, general analgesia, amnesia, reflex inhibition and skeletal muscle relaxation; the degree of inhibition of the central nervous system is related to the concentration of the drug in the blood and can be controlled and regulated; the inhibition is completely reversible, after the medicine is metabolized or discharged from the body, the mind and various reflexes of a patient are gradually recovered, the patient who is awakened by general anesthesia operation is easy to restless, mainly shows excitation, limb unconsciousness and the like, so that the heart rate is increased, the blood pressure is increased, the unconsciousness and struggle of the patient easily cause the falling of the catheter, and when the restless patient feels the interference of the catheter of a bronchus, an oxygen mask and the like, the patient can be easily pulled by hands subconsciously.

Therefore, medical personnel need take necessary measure to fix patient, and current auxiliary fixture adopts the band to tie up patient's four limbs on the bed body mostly, and some serious patient of restless condition can pass through the band with the trunk and fix on the bed body.

The following situations generally occur in prior art auxiliary fixing devices, which bring great inconvenience to the medical staff: the fixation is not firm and the fixation effect is not good: when medical personnel fix restless patient on the bed body, adopt the strap mostly, have elastic band etc. and tie up patient's four limbs tightly, because fixed effect is unsatisfactory, patient's restless struggles and opens the constraint of strap very easily and then leads to the emergence of accident, leads to the secondary damage to patient.

An effective solution to the problems in the related art has not been proposed yet.

Disclosure of Invention

In view of the problems in the related art, the present invention provides an anesthetic fixing device to overcome the above-mentioned problems in the related art.

The technical scheme of the invention is realized as follows:

an anesthesia fixing device comprises a fixing bottom plate, a head fixing device is fixedly arranged at the top of the fixing bottom plate and comprises a shell, a first cavity is formed in the shell, a first limit clamp plate and a second limit clamp plate are respectively arranged in the first cavity, telescopic rods are symmetrically connected to one sides, close to the inner wall of the first cavity, of the first limit clamp plate and the second limit clamp plate, a reset spring is sleeved outside the telescopic rods, connecting blocks are symmetrically arranged on the first limit clamp plate, elastic binding bands are arranged on the connecting blocks, binding band limiting ports are symmetrically arranged on the second limit clamp plate, arm fixing devices are symmetrically arranged on two sides below the head fixing device and comprise connecting cylinders, second cavities are formed in the connecting cylinders, fixing transverse plates are fixedly arranged at the bottoms of the second cavities, lower arc-shaped placing plates are symmetrically arranged on the fixing transverse plates, the wrist fixing device comprises a fixing base, an arc-shaped sleeve I is arranged on the fixing base, an arc-shaped sleeve II is arranged on the arc-shaped sleeve I, arc-shaped grooves are formed in the arc-shaped sleeve I and the arc-shaped grooves at two ends of the arc-shaped sleeve II, and arc-shaped rods are connected between the arc-shaped grooves at two ends of the arc-shaped sleeve I and the arc-shaped grooves at two ends of the arc-shaped sleeve II, the wrist fixing device is characterized in that a compression spring is sleeved on the arc-shaped rod, supporting rods are arranged on two sides of the fixing base, a fixing plate is fixedly arranged between the supporting rods, a second threaded hole is formed in the fixing plate, a second threaded rod penetrates through the second threaded hole, the bottom end of the second threaded rod is connected with the second arc-shaped sleeve through a bearing, a leg fixing structure is arranged below the wrist fixing device and comprises an outer frame, partition plates are symmetrically arranged in the outer frame, U-shaped blocks are arranged on two sides of the partition plates in the outer frame, electric telescopic rods are symmetrically arranged at the top of the outer frame, arc-shaped pressing plates are fixedly connected to the bottom ends of the electric telescopic rods, a foot fixing device is arranged below the leg fixing structure and comprises an outer shell, a fixing block is arranged at the bottom in the outer, the improved shoe cabinet is characterized in that sliding grooves are formed in two sides of the inner wall of the outer shell, clamping plates are arranged in the outer shell, sliding blocks matched with the sliding grooves are arranged at two ends of each clamping plate, and arc-shaped instep fixing grooves are formed in the clamping plates.

Furthermore, a fixing base is arranged below the fixing bottom plate, and supporting legs are symmetrically arranged below the fixing base.

Furthermore, a headboard is fixedly arranged at one end of the fixed bottom plate, which is positioned at the head fixing device.

Furthermore, the inner sides of the first limiting clamping plate and the second limiting clamping plate are both provided with elastic protective layers.

Further, arc backing plates are arranged in the lower arc-shaped placing plate and the upper arc-shaped placing plate.

Furthermore, elastic protective layers are arranged on the inner sides of the first arc-shaped sleeve and the second arc-shaped sleeve.

Furthermore, a rotating handle is arranged at the top end of the second threaded rod.

Furthermore, a control switch in control connection with the electric telescopic rod is arranged outside the outer frame.

Further, a sponge layer is arranged in the foot placing groove.

Furthermore, the bottom of the fixed transverse plate is symmetrically provided with supporting pads.

The invention provides an anesthesia fixing device, which has the following beneficial effects:

(1) the head fixing device is fixedly arranged at the top of the fixing bottom plate, the arm fixing devices are symmetrically arranged on two sides below the head fixing device, the wrist fixing devices are fixedly arranged below the arm fixing devices, the leg fixing structure is arranged below the wrist fixing device, the foot fixing device is arranged below the leg fixing structure, when the wrist fixing device is used, a patient lies on the fixing bottom plate, the head is placed in the first cavity, the head can be fixed by inserting the elastic binding band into the binding band limiting port under the action of the telescopic rod and the reset spring, the arm penetrates through the second cavity in the connecting cylinder, the first threaded rod is rotated by the action of the first threaded hole and the connecting bearing, the upper arc placing plate presses the lower arc placing plate down, the lower arm and the arm are respectively fixed, the wrist penetrates between the first arc sleeve and the second arc sleeve, and the second threaded rod is rotated, utilize the effect of screw hole two, utilize the cooperation of bearing, make two pushes down of arc cover, make the arc pole get into in the arc wall, fix the wrist, utilize compression spring's effect to reset, pass outer frame with the leg again, place on the U-shaped piece, start electric telescopic handle, make the arc clamp plate push down and play fixed effect to the shank, put the step on the standing groove of foot at last, utilize the effect of slider with the spout, make the cardboard fix on the shell body, and the instep passes arc instep fixed slot, can realize whole body fixed, such device simple structure, high durability and convenient use, can fix one by one each joint department of health, and be difficult not hard up after fixing, and can not cause the secondary injury to patient.

(2) The fixing base is arranged below the fixing base plate, and the supporting legs are symmetrically arranged below the fixing base and have the function of supporting the whole equipment.

(3) A headboard is fixedly arranged at one end of the head fixing device on the fixing bottom plate, so that the headrest for the head of a patient is convenient.

(4) The inner sides of the first limiting clamping plate and the second limiting clamping plate are respectively provided with an elastic protective layer which plays a role in protecting the head when being fixed.

(5) The lower arc-shaped placing plate and the upper arc-shaped placing plate are internally provided with arc-shaped base plates, and when the lower arc-shaped placing plate and the upper arc-shaped placing plate are fixed, the arm is protected.

(6) And elastic protective layers are arranged on the inner sides of the first arc-shaped sleeve and the second arc-shaped sleeve respectively, so that the wrists are protected.

(7) And a rotating handle is arranged at the top end of the second threaded rod, so that the second threaded rod can rotate conveniently.

(8) And a control switch which is connected with the electric telescopic rod in a control way is arranged outside the outer frame, so that the electric telescopic rod can be controlled conveniently.

(9) The sponge layer is arranged in the foot placing groove, and the foot is protected.

(10) And the bottom of the fixed transverse plate is symmetrically provided with supporting pads which play a supporting role for the fixed transverse plate.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a front view of an anesthesia fixture according to an embodiment of the present invention;

FIG. 2 is a schematic view of a head restraint of an anesthesia fixture, according to an embodiment of the present invention;

FIG. 3 is a schematic structural view of an arm fixing device in an anesthesia fixing device according to an embodiment of the present invention;

FIG. 4 is a schematic structural view of an upper arc-shaped placing plate and a lower arc-shaped placing plate in an anesthesia fixing device according to an embodiment of the present invention;

FIG. 5 is a schematic view of the wrist immobilization device in an anesthesia fixture, according to an embodiment of the present invention;

FIG. 6 is a schematic structural view of a leg fixing structure in an anesthesia fixing device according to an embodiment of the present invention;

FIG. 7 is a schematic view of a foot fixing device in an anesthesia fixing device, according to an embodiment of the present invention;

fig. 8 is a schematic structural view of a clamping plate in an anesthesia fixing device according to an embodiment of the present invention.

In the figure:

1. fixing the bottom plate; 2. a head fixing device; 3. a housing; 4. a first cavity; 5. a first limiting clamp plate; 6. a second limiting clamp plate; 7. a telescopic rod; 8. a return spring; 9. connecting blocks; 10. an elastic band; 11. a binding belt limiting opening; 12. an arm fixing device; 13. a connecting cylinder; 14. a second cavity; 15. fixing the transverse plate; 16. a lower arc-shaped placing plate; 17. a first threaded hole; 18. a first threaded rod; 19. a threaded sleeve; 20. an L-shaped support frame; 21. connecting a bearing; 22. connecting the top plate; 23. an upper arc-shaped placing plate; 24. A wrist fixing device; 25. a fixed base; 26. the first arc sleeve is sleeved; 27. a second arc-shaped sleeve; 28. an arc-shaped slot; 29. an arcuate bar; 30. a compression spring; 31. a support bar; 32. a fixing plate; 33. a second threaded hole; 34. a second threaded rod; 35. a bearing; 36. a leg fixing structure; 37. a partition plate; 38. a U-shaped block; 39. an electric telescopic rod; 40. an arc-shaped pressing plate; 41. a foot fixing device; 42. an outer housing; 43. a fixed block; 44. a foot placement groove; 45. a chute; 46. clamping a plate; 47. a slider; 48. an arc instep fixing groove; 49. a fixed base; 50. supporting legs; 51. a headboard; 52. an elastic protective layer; 53. a support pad; 54. an arc-shaped base plate; 55. an elastic protective layer; 56. rotating the handle; 57. a control switch; 58. and (5) an outer frame.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.

The invention is further described with reference to the following drawings and detailed description:

the first embodiment is as follows:

referring to fig. 1 to 8, an anesthesia fixing device according to an embodiment of the present invention includes a fixing base plate 1, a head fixing device 2 is fixed on a top of the fixing base plate 1, the head fixing device 2 includes a housing 3, a first cavity 4 is formed in the housing 3, a first limit clamp 5 and a second limit clamp 6 are respectively disposed in the first cavity 4, one sides of the first limit clamp 5 and the second limit clamp 6, which are close to an inner wall of the first cavity 4, are symmetrically connected with a telescopic rod 7, a return spring 8 is sleeved outside the telescopic rod 7, a first limit clamp 5 is symmetrically provided with a connecting block 9, the connecting block 9 is provided with an elastic band 10, the second limit clamp 6 is symmetrically provided with a band limit opening 11, two sides below the head fixing device 2 are symmetrically provided with an arm fixing device 12, the arm fixing device 12 includes a connecting cylinder 13, a second cavity 14 is arranged in the connecting cylinder 13, a first fixing transverse plate 15 is fixedly arranged at the bottom of the second cavity 14, lower arc-shaped placing plates 16 are symmetrically arranged on the first fixing transverse plate 15, first threaded holes 17 are symmetrically arranged on the top of the connecting cylinder 13, first threaded rods 18 penetrate through the first threaded holes 17, one ends, located in the second cavity 14, of the first threaded rods 18 are sleeved with threaded sleeves 19, two sides of each threaded sleeve 19 are fixedly connected with the inner wall of the connecting cylinder 13 through L-shaped supporting frames 20, the bottoms of the first threaded rods 18 are respectively connected with a connecting bearing 21, the bottoms of the connecting bearings 21 are connected with connecting top plates 22, upper arc-shaped placing plates 23 matched with the lower arc-shaped placing plates 16 are symmetrically and fixedly arranged below the connecting top plates 22, wrist fixing devices 24 are fixedly arranged below the arm fixing devices 12, and each wrist fixing device 24 comprises a fixing base 25, the fixing base 25 is provided with a first arc sleeve 26, the first arc sleeve 26 is provided with a second arc sleeve 27, the first arc sleeve 26 and the second arc sleeve 27 are both provided with arc grooves 28, arc rods 29 are connected between the first arc sleeve 26 and the arc grooves 28 at two ends of the second arc sleeve 27, a compression spring 30 is sleeved on the arc rods 29, support rods 31 are arranged at two sides of the fixing base 25, a fixing plate 32 is fixedly arranged between the support rods 31, a second threaded hole 33 is formed in the fixing plate 32, a second threaded rod 34 penetrates through the second threaded hole 33, the bottom end of the second threaded rod 34 is connected with the second arc sleeve 27 through a bearing 35, a leg fixing structure 36 is arranged below the wrist fixing device 24 and comprises an outer frame 58, partition plates 37 are symmetrically arranged in the outer frame 58, and U-shaped blocks 38 are arranged at two sides of the partition plates 37 in the outer frame 58, the symmetry of outer frame 58 top is equipped with electric telescopic handle 39, electric telescopic handle 39 bottom fixedly connected with arc clamp plate 40, shank fixed knot constructs 36 below and is equipped with foot fixing device 41, foot fixing device 41 includes shell body 42, the bottom is equipped with fixed block 43 in the shell body 42, the symmetry is equipped with foot standing groove 44 on the fixed block 43, shell body 42 inner wall both sides all are equipped with spout 45, be equipped with cardboard 46 in the shell body 42, the both ends of cardboard 46 be equipped with spout 45 assorted slider 47, arc instep fixed slot 48 has been seted up on the cardboard 46.

Through the scheme of the invention, the head fixing device 2 is fixedly arranged at the top of the fixed bottom plate 1, the arm fixing devices 12 are symmetrically arranged at two sides below the head fixing device 2, the wrist fixing devices 24 are fixedly arranged below the arm fixing devices 12, the leg fixing structure 36 is arranged below the wrist fixing device 24, the foot fixing device 41 is arranged below the leg fixing structure 36, when in use, a patient lies on the fixed bottom plate 1, the head is placed in the first cavity 4, the head can be fixed by inserting the elastic bridle 10 into the bridle limiting port 11 under the action of the expansion link 7 and the reset spring 8, the arm passes through the second cavity 14 in the connecting cylinder 13, the first threaded rod 18 is rotated, the upper arc placing plate 23 is pressed down on the lower arc placing plate 16 under the action of the connecting bearing 21 under the action of the first threaded hole 17, and the forearm and the arm are respectively fixed, the wrist passes through the space between the first arc-shaped sleeve 26 and the second arc-shaped sleeve 27, the second threaded rod 34 is rotated, the second arc-shaped sleeve 27 is pressed down by the action of the second threaded hole 33 and the cooperation of the bearing 35, the arc-shaped rod 29 enters the arc-shaped groove 28, fixing the wrist, restoring by the action of the compression spring 30, putting the leg on the U-shaped block 38 by passing the leg through the outer frame 58, starting the electric telescopic rod 39 to press the arc-shaped pressing plate 40 downwards to fix the leg, finally putting the foot on the foot placing groove 44, fixing the clamping plate 46 on the outer shell 42 by the action of the sliding block 47 and the sliding groove 45, and passing the instep through the arc-shaped instep fixing groove 48, can realize whole body fixed, such device simple structure, convenient to use can fix each joint department of health one by one, and is difficult not hard up after fixed, and can not cause the secondary injury to patient.

Example two:

as shown in figure 1, a fixed base is arranged below the fixed base plate, supporting legs are symmetrically arranged below the fixed base, and the supporting legs are utilized to support the whole equipment.

Example three:

as shown in fig. 2, the inner sides of the first limiting clamping plate and the second limiting clamping plate are both provided with an elastic protection layer, and the elasticity of the elastic protection layers plays a role in protecting the head when the first limiting clamping plate and the second limiting clamping plate are fixed.

Example four:

as shown in fig. 4, the arc-shaped base plates are arranged in the lower arc-shaped placing plate and the upper arc-shaped placing plate, and when the lower arc-shaped placing plate and the upper arc-shaped placing plate are fixed, the arms are protected.

Example five:

as shown in fig. 6, a control switch in control connection with the electric telescopic rod is arranged outside the outer frame, and when the electric telescopic rod is used, the control switch is used for controlling the electric telescopic rod to work, so that the electric telescopic rod can be conveniently controlled.

For the convenience of understanding the technical solutions of the present invention, the following detailed description will be made on the working principle or the operation mode of the present invention in the practical process.

In practical application, when in use, a patient lies on the fixing bottom plate 1, the head is placed in the first cavity 4, the head can be fixed by inserting the elastic strap 10 into the strap limiting opening 11 under the action of the telescopic rod 7 and the return spring 8, the arm passes through the second cavity 14 in the connecting cylinder 13, the first threaded rod 18 is rotated, the upper arc placing plate 23 is pressed down on the lower arc placing plate 16 under the action of the first threaded hole 17 and the connecting bearing 21, the forearm and the arm are respectively fixed, the wrist passes through the space between the first arc sleeve 26 and the second arc sleeve 27, the second threaded rod 34 is rotated, the second arc sleeve 27 is pressed down under the action of the second threaded hole 33 and the matching of the bearing 35 under the action of the second threaded hole 33, the arc rod 29 enters the arc groove 28, the wrist is fixed, the wrist is reset under the action of the compression spring 30, and the leg passes through the outer frame 58, place on U-shaped piece 38, start electric telescopic handle 39, make arc clamp plate 40 push down and play fixed effect to the shank, put the foot on foot standing groove 44 at last, utilize slider 47 and spout 45's effect, make cardboard 46 fix on shell body 42, and the instep passes arc instep fixed slot 48, can realize whole-body fixed, such device simple structure, high durability and convenient use, can fix each joint department of health one by one, and fixed back is difficult not hard up, and can not cause the secondary injury to patient.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The anesthesia fixing device is characterized by comprising a fixing bottom plate (1), wherein a head fixing device (2) is fixedly arranged at the top of the fixing bottom plate (1).

2. The anesthesia fixing device according to claim 1, wherein the head fixing device (2) comprises a housing (3), a first cavity (4) is formed in the housing (3), a first limit clamp (5) and a second limit clamp (6) are respectively arranged in the first cavity (4), one sides of the first limit clamp (5) and the second limit clamp (6) close to the inner wall of the first cavity (4) are symmetrically connected with telescopic rods (7), return springs (8) are sleeved outside the telescopic rods (7), connecting blocks (9) are symmetrically arranged on the first limit clamp (5), elastic bands (10) are arranged on the connecting blocks (9), band limit openings (11) are symmetrically arranged on the second limit clamp (6), arm fixing devices (12) are symmetrically arranged on two sides below the head fixing device (2), arm fixing device (12) includes connecting cylinder (13), be equipped with cavity two (14) in connecting cylinder (13), the fixed diaphragm (15) that is equipped with in bottom of cavity two (14), fixed diaphragm (15) are gone up the symmetry and are equipped with down arc and place board (16), the symmetry is equipped with screw hole (17) on the top of connecting cylinder (13), run through threaded rod (18) in screw hole (17), threaded rod (18) are located one in cavity two (14) is served and is overlapped and be equipped with thread bush (19), the both sides of thread bush (19) through L shape support frame (20) with connecting cylinder (13) inner wall fixed connection, the bottom of threaded rod (18) all is connected with connecting bearing (21), the bottom of connecting bearing (21) is connected with and connects roof (22), connect roof (22) below symmetry fixed be equipped with the arc is placed board (16) assorted down and is placed board (16) arc and is placed board (17) the last place board (17) the arc 23) The wrist fixing device (24) is fixedly arranged below the arm fixing device (12), the wrist fixing device (24) comprises a fixing base (25), a first arc sleeve (26) is arranged on the fixing base (25), a second arc sleeve (27) is arranged on the first arc sleeve (26), arc grooves (28) are formed in the first arc sleeve (26) and the second arc sleeve (27), arc rods (29) are connected between the arc grooves (28) at the two ends of the first arc sleeve (26) and the second arc sleeve (27), compression springs (30) are sleeved on the arc rods (29), supporting rods (31) are arranged on the two sides of the fixing base (25), a fixing plate (32) is fixedly arranged between the supporting rods (31), a second threaded rod (33) is arranged on the fixing plate (32), and two threaded rods (34) penetrate through the second threaded rod (33), the bottom of the second threaded rod (34) is connected with the second arc-shaped sleeve (27) through a bearing (35), a leg fixing structure (36) is arranged below the wrist fixing device (24), the leg fixing structure (36) comprises an outer frame (58), partition plates (37) are symmetrically arranged in the outer frame (58), U-shaped blocks (38) are arranged on two sides of each partition plate (37) in the outer frame (58), electric telescopic rods (39) are symmetrically arranged on the top of the outer frame (58), arc-shaped pressing plates (40) are fixedly connected to the bottom ends of the electric telescopic rods (39), a foot fixing device (41) is arranged below the leg fixing structure (36), the foot fixing device (41) comprises an outer shell (42), a fixing block (43) is arranged at the bottom in the outer shell (42), and foot placing grooves (44) are symmetrically arranged on the fixing block (43), sliding grooves (45) are formed in two sides of the inner wall of the outer shell (42), a clamping plate (46) is arranged in the outer shell (42), sliding blocks (47) matched with the sliding grooves (45) are arranged at two ends of the clamping plate (46), and arc-shaped instep fixing grooves (48) are formed in the clamping plate (46); a fixing base (49) is arranged below the fixing base plate (1), and supporting legs (50) are symmetrically arranged below the fixing base (49).

3. An anesthesia fixing device according to claim 2, characterized in that a headboard (51) is fixedly arranged at one end of said fixing base (1) located at said head fixing device (2).

4. The anesthesia fixing device according to claim 2, wherein the inner sides of the first and second retaining clips (5, 6) are provided with an elastic protection layer (52).

5. An anesthesia fixing device according to claim 2, characterized in that an arc-shaped backing plate (54) is provided in both said lower arc-shaped resting plate (16) and said upper arc-shaped resting plate (23).