External chest cardiac compression device for critical medical treatment

Abstract

The invention discloses an external chest cardiac compression device for severe case medical treatment, and relates to the technical field of medical treatment. The reciprocating pressing mechanism comprises a sliding strip slidably connected to the inner wall of the limiting hole, a first motor fixedly connected to the back face of the connecting strip, a fixing shaft fixedly connected to the front face of the connecting strip and a fixedly-connected rack fixedly connected to the front face of the fixing strip, and the front face of the sliding strip is fixedly connected with a movable rack. The bottom of the movable rack is fixedly connected with a fixing rod, and the bottom end of the fixing rod is provided with a buffer pressing component. By arranging the reciprocating pressing mechanism, external chest compression can be automatically and continuously performed, so that the problem that manual compression is difficult to maintain the consistency and stability of the effect is solved, the success rate of cardio-pulmonary resuscitation is favorably improved, and the success rate of the cardio-pulmonary resuscitation is improved. In addition, the buffering assembly can absorb a part of impact force, and sternum fracture of the patient caused by the fact that the pressing force is too large is avoided.

Description

Technical Field

[0001] The invention relates to the field of medical technology, in particular to an external cardiac compressor for critical care medicine. Background Art

[0002] At present, when dealing with patients with cardiac arrest, medical staff generally use manual chest compression in combination with artificial respiration for rescue. Manual compression operations consume a lot of physical energy and require several people to perform chest compressions alternately, which is time-consuming and labor-intensive, and directly affects the best time to rescue emergency patients. Manual chest compressions require operators to press steadily, evenly, and regularly. During cardiopulmonary resuscitation, continuous high-quality chest compressions are crucial to improving the success rate of resuscitation. Manual compressions are difficult to maintain stable strength and frequency for a long time, and different patients' physical conditions and resuscitation needs will require different compression depths and frequencies. In addition, existing chest compressors are prone to cause sternal fractures in patients during compressions. Summary of the invention

[0003] The purpose of the present invention is to provide an external cardiac compressor for critical care to solve the technical problems mentioned in the above background technology.

[0004] The purpose of the present invention can be achieved through the following technical solutions:

[0005] An external cardiac compressor for critical care includes a protective groove, a bed board and a fixing bar, wherein a connecting bar is fixedly connected to the left side of the fixing bar, a limiting hole is penetrated through the fixing bar, and a reciprocating pressing mechanism is arranged between the limiting hole, the connecting bar and the fixing bar.

[0006] The reciprocating pressing mechanism includes a sliding bar slidably connected to the inner wall of the limiting hole, a first motor fixedly connected to the back of the connecting bar, a fixed shaft fixedly connected to the front of the connecting bar and a fixed rack fixedly connected to the front of the fixed bar. The front of the sliding bar is fixedly connected to a moving rack, the bottom of the moving rack is fixedly connected to a fixed rod, and a buffer pressing assembly is provided at the bottom end of the fixed rod. The surface of the output shaft of the first motor is fixedly connected to a transmission disk, the front of the transmission disk is fixedly connected to a transmission shaft, the surface of the fixed shaft is rotatably connected to a connecting arm, and the connecting arm is rotatably connected to a gear through a connecting shaft.

[0007] As a further solution of the present invention: the buffer pressing assembly includes a fixed plate fixedly connected to the bottom end of the fixed rod, the fixed plate is fixedly connected to the connecting plate through a spring rod, the bottom of the connecting plate is fixedly connected to the connecting rod, and the bottom of the connecting rod is fixedly connected to the pressing head.

[0008] As a further solution of the present invention: a support column is fixedly connected to the back of the protective groove, a connecting column is fixedly connected to the front of the supporting column, and the connecting column and the fixing bar are fixedly connected.

[0009] As a further solution of the present invention: a headrest and two armrests are fixedly connected to the top of the bed board, a universal wheel device is provided at the bottom of the protective groove, and a position adjustment mechanism is provided between the bed board and the protective groove.

[0010] As a further solution of the present invention: the position adjustment mechanism includes two fixed blocks fixedly connected to the bottom of the bed board and a machine base fixedly connected to the bottom wall of the protective groove, the inner wall of the machine base is fixedly connected to a second motor, the second motor is provided with two output shafts, the surfaces of the two output shafts are fixedly connected to transmission arms, the inner walls of the two transmission arms are rotatably connected to transmission bars, and the two transmission bars are rotatably connected to connecting blocks.

[0011] As a further solution of the present invention: the fixed rack and the movable rack are both meshed with the gears, the transmission shaft and the connecting arm are adapted to each other, and four spring rods are provided and distributed in a rectangular array between the fixed plate and the connecting plate.

[0012] As a further solution of the present invention: the two connecting blocks are rotatably connected to the adjacent fixing blocks respectively.

[0013] As a further solution of the present invention: four universal wheel devices are provided and distributed at the bottom edge of the protective groove in a rectangular array.

[0014] Beneficial Effects

[0015] The present invention provides an external cardiac compressor for critical care. Compared with the prior art, it has the following beneficial effects:

[0016] (1) The present application provides a reciprocating pressing mechanism to automatically and continuously perform chest compressions, thereby solving the problem of the inability of manual compressions to maintain consistency and stability, helping to improve the success rate of cardiopulmonary resuscitation and thus saving more patients' lives. In addition, the buffer component can absorb part of the impact force to avoid excessive pressing that may cause sternal fractures in patients.

[0017] (2) The present application provides a position adjustment mechanism, which can adjust the height of the patient according to the patient's body shape, thereby improving adaptability to different patients. When only the output shaft on one side of the motor is rotated, the tilt angle can be adjusted to make the patient's lying position more comfortable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the main figure of the present invention;

[0019] Figure 2 It is a three-dimensional diagram of a first partial structure of the present invention;

[0020] Figure 3 It is a three-dimensional diagram of the reciprocating pressing mechanism of the present invention;

[0021] Figure 4 It is a partial structural stereogram of the reciprocating pressing mechanism of the present invention;

[0022] Figure 5 A three-dimensional diagram of the buffer pressing assembly of the present invention;

[0023] Figure 6 is a three-dimensional diagram of a second partial structure of the present invention;

[0024] Figure 7 is a three-dimensional diagram of the position adjustment mechanism of the present invention;

[0025] Figure 8 It is a partial structural stereogram of the position adjustment mechanism of the present invention.

[0026] In the figure: 1. protective groove; 2. bed board; 3. fixing strip; 4. connecting strip; 5. limiting hole; 6. reciprocating pressing mechanism; 61. sliding strip; 62. first motor; 63. fixed shaft; 64. fixed rack; 65. movable rack; 66. fixing rod; 67. buffer pressing assembly; 671. fixing plate; 672. spring rod; 673. connecting plate; 674. connecting rod; 675. pressing head; 68. transmission plate; 69. transmission shaft; 610. connecting arm; 611. connecting shaft; 612. gear; 7. support column; 8. connecting column; 9. headrest; 10. armrest; 11. universal wheel device; 12. position adjustment mechanism; 121. fixing block; 122. base; 123. second motor; 124. transmission arm; 125. transmission strip; 126. connecting block. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] See also Figure 1-8 The present invention provides a technical solution: an external cardiac compressor for critical care, specifically including the following embodiments:

[0029] Example 1

[0030] It includes a protective groove 1, a bed board 2 and a fixing bar 3, a connecting bar 4 is fixedly connected to the left side of the fixing bar 3, a limiting hole 5 is penetrated through the fixing bar 3, and a reciprocating pressing mechanism 6 is arranged between the limiting hole 5, the connecting bar 4 and the fixing bar 3; the reciprocating pressing mechanism 6 includes a sliding bar 61 slidably connected to the inner wall of the limiting hole 5, a first motor 62 fixedly connected to the back side of the connecting bar 4, a fixed shaft 63 fixedly connected to the front side of the connecting bar 4 and a fixed rack 64 fixedly connected to the front side of the fixing bar 3, the first motor 62 is electrically connected to an external power supply and is controlled by an external program. A movable rack 65 is fixedly connected to the front of the slide bar 61, a fixed rod 66 is fixedly connected to the bottom of the movable rack 65, a buffer pressing assembly 67 is arranged at the bottom end of the fixed rod 66, a transmission disk 68 is fixedly connected to the surface of the output shaft of the first motor 62, a transmission shaft 69 is fixedly connected to the front of the transmission disk 68, a connecting arm 610 is rotatably connected to the surface of the fixed shaft 63, and the connecting arm 610 is rotatably connected to the gear 612 via the connecting shaft 611. By setting up a reciprocating pressing mechanism 6, chest compression can be performed automatically and continuously, thereby solving the problem of consistency and stability of the effect of manual compression, which is difficult to maintain, helps to improve the success rate of cardiopulmonary resuscitation, and thus saves more patients' lives, and the buffer assembly can absorb part of the impact force to avoid excessive pressing pressure causing sternum fracture of the patient.

[0031] The buffer pressing assembly 67 includes a fixed plate 671 fixedly connected to the bottom end of the fixed rod 66, the fixed plate 671 is fixedly connected to a connecting plate 673 through a spring rod 672, the bottom of the connecting plate 673 is fixedly connected to a connecting rod 674, the bottom of the connecting rod 674 is fixedly connected to a pressing head 675, the pressing head 675 is made of medical grade silicone, which is soft and elastic, and can provide a good buffering effect. At the same time, medical grade silicone has excellent antibacterial properties and biocompatibility, and is suitable for use in critical care external cardiac compressors.

[0032] A support column 7 is fixedly connected to the back of the protection groove 1 , a connecting column 8 is fixedly connected to the front of the supporting column 7 , and the connecting column 8 and the fixing bar 3 are fixedly connected.

[0033] The top of the bed board 2 is fixedly connected with a headrest 9 and two armrests 10. The design of the headrest 9 can support the patient's head, and the design of the two armrests 10 allows the patient to hold both hands through, which improves the stability of the patient's body to a certain extent. A universal wheel device 11 is provided at the bottom of the protective groove 1, and a position adjustment mechanism 12 is provided between the bed board 2 and the protective groove 1. By providing the position adjustment mechanism 12, the height of the patient can be adjusted according to the patient's body shape, which improves the adaptability to different patients. When only the output shaft on one side of the motor is rotated, the tilt angle can be adjusted to make the patient's lying position more comfortable.

[0034] The position adjustment mechanism 12 includes two fixed blocks 121 fixedly connected to the bottom of the bed plate 2 and a base 122 fixedly connected to the inner bottom wall of the protective groove 1. The inner wall of the base 122 is fixedly connected to a second motor 123. The second motor 123 is a dual-output motor with two output shafts. The two output shafts can be controlled independently. The rotation direction, speed and position of each output shaft can be adjusted as needed. In addition, the dual-output motor has a high power and torque output and can provide a strong driving force. The second motor 123 is electrically connected to an external power supply and is controlled by an external program. The second motor 123 is provided with two output shafts. The surfaces of the two output shafts are fixedly connected to transmission arms 124. The inner walls of the two transmission arms 124 are rotatably connected to transmission bars 125. The two transmission bars 125 are rotatably connected to connection blocks 126.

[0035] The fixed rack 64 and the movable rack 65 are both meshed with the gear 612, and the transmission shaft 69 and the connecting arm 610 are adapted to each other. Four spring rods 672 are provided and distributed in a rectangular array between the fixed plate 671 and the connecting plate 673. The design of the spring rod 672 provides a pressing buffer force, which can not only protect the safety of the patient, but also prevent the pressing head 675 from being too easily damaged due to direct gravity contact.

[0036] The two connecting blocks 126 are rotatably connected to adjacent fixing blocks 121 .

[0037] There are four universal wheel devices 11, which are distributed in a rectangular array at the bottom edge of the protective groove 1. The universal wheel device 11 can move in any direction and has a brake system. Braking when not in motion can ensure the stability of the entire device. The design of multiple universal wheel devices 11 ensures the flexibility of the equipment.

[0038] Example 2

[0039] It includes a protective groove 1, a bed board 2 and a fixing bar 3, a connecting bar 4 is fixedly connected to the left side of the fixing bar 3, a limiting hole 5 is penetrated through the fixing bar 3, and a reciprocating pressing mechanism 6 is arranged between the limiting hole 5, the connecting bar 4 and the fixing bar 3; the reciprocating pressing mechanism 6 includes a sliding bar 61 slidably connected to the inner wall of the limiting hole 5, a first motor 62 fixedly connected to the back side of the connecting bar 4, a fixed shaft 63 fixedly connected to the front side of the connecting bar 4 and a fixed rack 64 fixedly connected to the front side of the fixing bar 3, the first motor 62 is electrically connected to an external power supply and is controlled by an external program. A movable rack 65 is fixedly connected to the front of the slide bar 61, a fixed rod 66 is fixedly connected to the bottom of the movable rack 65, a buffer pressing assembly 67 is arranged at the bottom end of the fixed rod 66, a transmission disk 68 is fixedly connected to the surface of the output shaft of the first motor 62, a transmission shaft 69 is fixedly connected to the front of the transmission disk 68, a connecting arm 610 is rotatably connected to the surface of the fixed shaft 63, and the connecting arm 610 is rotatably connected to the gear 612 via the connecting shaft 611. By setting up a reciprocating pressing mechanism 6, chest compression can be performed automatically and continuously, thereby solving the problem of consistency and stability of the effect of manual compression, which is difficult to maintain, helps to improve the success rate of cardiopulmonary resuscitation, and thus saves more patients' lives, and the buffer assembly can absorb part of the impact force to avoid excessive pressing pressure causing sternum fracture of the patient.

[0040] The buffer pressing assembly 67 includes a fixed plate 671 fixedly connected to the bottom end of the fixed rod 66, the fixed plate 671 is fixedly connected to a connecting plate 673 through a spring rod 672, the bottom of the connecting plate 673 is fixedly connected to a connecting rod 674, the bottom of the connecting rod 674 is fixedly connected to a pressing head 675, the pressing head 675 is made of medical grade silicone, which is soft and elastic, and can provide a good buffering effect. At the same time, medical grade silicone has excellent antibacterial properties and biocompatibility, and is suitable for use in critical care external cardiac compressors.

[0041] A support column 7 is fixedly connected to the back of the protection groove 1 , a connecting column 8 is fixedly connected to the front of the supporting column 7 , and the connecting column 8 and the fixing bar 3 are fixedly connected.

[0042] The top of the bed board 2 is fixedly connected with a headrest 9 and two armrests 10. The design of the headrest 9 can support the patient's head, and the design of the two armrests 10 allows the patient to hold both hands through, which improves the stability of the patient's body to a certain extent. A universal wheel device 11 is provided at the bottom of the protective groove 1, and a position adjustment mechanism 12 is provided between the bed board 2 and the protective groove 1. By providing the position adjustment mechanism 12, the height of the patient can be adjusted according to the patient's body shape, which improves the adaptability to different patients. When only the output shaft on one side of the motor is rotated, the tilt angle can be adjusted to make the patient's lying position more comfortable.

[0043] The position adjustment mechanism 12 includes two fixed blocks 121 fixedly connected to the bottom of the bed plate 2 and a base 122 fixedly connected to the inner bottom wall of the protective groove 1. The inner wall of the base 122 is fixedly connected to a second motor 123. The second motor 123 is a dual-output motor with two output shafts. The two output shafts can be controlled independently. The rotation direction, speed and position of each output shaft can be adjusted as needed. In addition, the dual-output motor has a high power and torque output and can provide a strong driving force. The second motor 123 is electrically connected to an external power supply and is controlled by an external program. The second motor 123 is provided with two output shafts. The surfaces of the two output shafts are fixedly connected to transmission arms 124. The inner walls of the two transmission arms 124 are rotatably connected to transmission bars 125. The two transmission bars 125 are rotatably connected to connection blocks 126.

[0044] The fixed rack 64 and the movable rack 65 are both meshed with the gear 612, and the transmission shaft 69 and the connecting arm 610 are adapted to each other. Four spring rods 672 are provided and distributed in a rectangular array between the fixed plate 671 and the connecting plate 673. The design of the spring rod 672 provides a pressing buffer force, which can not only protect the safety of the patient, but also prevent the pressing head 675 from being too easily damaged due to direct gravity contact.

[0045] Example 3

[0046] It includes a protective groove 1, a bed board 2 and a fixing bar 3, a connecting bar 4 is fixedly connected to the left side of the fixing bar 3, a limiting hole 5 is penetrated through the fixing bar 3, and a reciprocating pressing mechanism 6 is arranged between the limiting hole 5, the connecting bar 4 and the fixing bar 3; the reciprocating pressing mechanism 6 includes a sliding bar 61 slidably connected to the inner wall of the limiting hole 5, a first motor 62 fixedly connected to the back side of the connecting bar 4, a fixed shaft 63 fixedly connected to the front side of the connecting bar 4 and a fixed rack 64 fixedly connected to the front side of the fixing bar 3, the first motor 62 is electrically connected to an external power supply and is controlled by an external program. A movable rack 65 is fixedly connected to the front of the slide bar 61, a fixed rod 66 is fixedly connected to the bottom of the movable rack 65, a buffer pressing assembly 67 is arranged at the bottom end of the fixed rod 66, a transmission disk 68 is fixedly connected to the surface of the output shaft of the first motor 62, a transmission shaft 69 is fixedly connected to the front of the transmission disk 68, a connecting arm 610 is rotatably connected to the surface of the fixed shaft 63, and the connecting arm 610 is rotatably connected to the gear 612 via the connecting shaft 611. By setting up a reciprocating pressing mechanism 6, chest compression can be performed automatically and continuously, thereby solving the problem of consistency and stability of the effect of manual compression, which is difficult to maintain, helps to improve the success rate of cardiopulmonary resuscitation, and thus saves more patients' lives, and the buffer assembly can absorb part of the impact force to avoid excessive pressing pressure causing sternum fracture of the patient.

[0047] The buffer pressing assembly 67 includes a fixed plate 671 fixedly connected to the bottom end of the fixed rod 66, the fixed plate 671 is fixedly connected to a connecting plate 673 through a spring rod 672, the bottom of the connecting plate 673 is fixedly connected to a connecting rod 674, the bottom of the connecting rod 674 is fixedly connected to a pressing head 675, the pressing head 675 is made of medical grade silicone, which is soft and elastic, and can provide a good buffering effect. At the same time, medical grade silicone has excellent antibacterial properties and biocompatibility, and is suitable for use in critical care external cardiac compressors.

[0048] A support column 7 is fixedly connected to the back of the protection groove 1 , a connecting column 8 is fixedly connected to the front of the supporting column 7 , and the connecting column 8 and the fixing bar 3 are fixedly connected.

[0049] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0050] The working principle of the present invention is as follows: first, the patient is placed on the bed board 2, and the patient is asked to insert both hands into the two armrests 10 for support, and the second motor 123 is started, and the two transmission arms 124 are driven to rotate through the two output shafts. When the two transmission arms 124 rotate, the two connecting blocks 126 are driven through the two transmission bars 125, and the two connecting blocks 126 drive the bed board 2 to rise and fall through the two fixed blocks 121 to adjust the height of the bed board 2. When only one side of the output shaft is rotated, the bed board 2 can be driven to tilt at an angle to change the patient's lying posture. When it is adjusted to a suitable height, the first motor 62 is started, and the transmission disk 68 is driven to rotate through the output shaft. When the transmission disk 68 rotates, the connecting arm 610 is driven through the transmission shaft 69, and the connecting arm 610 is rotated back and forth on the surface of the fixed shaft 63 with the fixed shaft 63 as the center within a range of 90 degrees. When the connecting arm 610 swings back and forth, the connecting shaft 611 drives the gear 612 to make the gear 612 reciprocate up and down along the fixed rack 64. Since the fixed rack 64 and the movable rack 65 are both meshed with the gear 612, the gear 612 acts on the fixed rack 64 to make the fixed rack 64 rotate when it moves up and down. When the gear 612 rotates and reciprocates up and down, it acts on the movable rack 65 synchronously to make the movable rack 65 reciprocate up and down in the inner wall of the limiting hole 5 through the slide bar 61. When the movable rack 65 moves, it drives the entire buffer pressing assembly 67 to move together through the fixed rod 66, so that the pressing head 675 therein continuously presses the patient. When the pressing head 675 presses and contacts the patient's chest, the spring rod 672 will retract with gravity, and the elastic force characteristic will reset it when it moves upward, so that the pressing contact of the pressing head 675 can be buffered.

[0051] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0052] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An external cardiac compressor for critical care, comprising a protective groove (1), a bed board (2) and a fixing bar (3), characterized in that: The left side of the fixing strip (3) is fixedly connected to a connecting strip (4), a limiting hole (5) is provided through the fixing strip (3), and a reciprocating pressing mechanism (6) is provided between the limiting hole (5), the connecting strip (4) and the fixing strip (3); The reciprocating pressing mechanism (6) comprises a sliding bar (61) slidably connected to the inner wall of the limiting hole (5), a first motor (62) fixedly connected to the back of the connecting bar (4), a fixed shaft (63) fixedly connected to the front of the connecting bar (4), and a fixed rack (64) fixedly connected to the front of the fixed bar (3); the front of the sliding bar (61) is fixedly connected to a moving rack (65); the bottom of the moving rack (65) is fixedly connected to a fixing rod (66); the bottom end of the fixing rod (66) is provided with a buffer pressing assembly (67); the surface of the output shaft of the first motor (62) is fixedly connected to a transmission disk (68); the front of the transmission disk (68) is fixedly connected to a transmission shaft (69); the surface of the fixed shaft (63) is rotatably connected to a connecting arm (610); the connecting arm (610) is rotatably connected to a gear (612) via a connecting shaft (611).

2. The external cardiac compressor for critical care according to claim 1, characterized in that: The buffer pressing assembly (67) comprises a fixing plate (671) fixedly connected to the bottom end of a fixing rod (66); the fixing plate (671) is fixedly connected to a connecting plate (673) via a spring rod (672); the bottom of the connecting plate (673) is fixedly connected to a connecting rod (674); the bottom of the connecting rod (674) is fixedly connected to a pressing head (675).

3. The external cardiac compressor for critical care according to claim 1, characterized in that: A support column (7) is fixedly connected to the back of the protection groove (1), a connection column (8) is fixedly connected to the front of the support column (7), and the connection column (8) and the fixing bar (3) are fixedly connected.

4. The external cardiac compressor for critical care according to claim 1, characterized in that: A headrest (9) and two armrests (10) are fixedly connected to the top of the bed board (2), a universal wheel device (11) is provided at the bottom of the protection groove (1), and a position adjustment mechanism (12) is provided between the bed board (2) and the protection groove (1).

5. The external cardiac compressor for critical care according to claim 4, characterized in that: The position adjustment mechanism (12) comprises two fixed blocks (121) fixedly connected to the bottom of the bed board (2) and a machine base (122) fixedly connected to the inner bottom wall of the protective groove (1); the inner wall of the machine base (122) is fixedly connected to a second motor (123); the second motor (123) is provided with two output shafts; the surfaces of the two output shafts are fixedly connected to transmission arms (124); the inner walls of the two transmission arms (124) are rotatably connected to transmission bars (125); and the two transmission bars (125) are rotatably connected to connection blocks (126).

6. The external cardiac compressor for critical care according to claim 2, characterized in that: The fixed rack (64) and the movable rack (65) are both meshed with the gear (612), the transmission shaft (69) and the connecting arm (610) are adapted to each other, and four spring rods (672) are provided and distributed in a rectangular array between the fixed plate (671) and the connecting plate (673).

7. The external cardiac compressor for critical care according to claim 5, characterized in that: The two connecting blocks (126) are rotatably connected to adjacent fixing blocks (121) respectively.

8. The external cardiac compressor for critical care according to claim 4, characterized in that: Four universal wheel devices (11) are provided and are distributed in a rectangular array at the bottom edge of the protection groove (1).

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