Ice compress device for orthopedic nursing

Abstract

The invention belongs to the technical field of orthopedic nursing, and discloses an ice compress device for orthopedic nursing, which comprises a main body support seat, a pair of position adjusting sliding frames are slidably connected to the top of the main body support seat, a threaded rod is rotatably connected to the interior of the main body support seat, and a transmission gear is fixedly connected to the middle of the threaded rod. A positioning sliding frame is slidably connected to the upper end of the body support base, a transmission toothed plate is fixedly connected to the middle of the positioning sliding frame, and a friction end is fixedly connected to one end of a threaded rod. Through cooperation of the friction end and a friction locking block and other structures, the flexible heat conduction plate can be conveniently shaped and fixed; a flexible heat conduction plate is used for pressing and attaching the affected limb to the skin of the affected limb, then a fixing bolt is screwed, the fixing bolt drives a friction locking block to move downwards, the friction locking block locks a friction end, a threaded rod is locked, and a positioning sliding frame and a position adjusting sliding frame are locked synchronously.

Description

Technical Field

[0001] The invention belongs to the technical field of orthopedic nursing, in particular to an ice compress device for orthopedic nursing. Background Art

[0002] Ice compress is a common physical therapy method in orthopedic care, which is mainly used for the treatment after acute injuries, such as swelling and pain caused by falls, sprains, fractures, etc. Ice compress can slow down the speed of nerve conduction and have a local analgesic effect. It can also reduce swelling symptoms and reduce inflammatory reactions. Ice compress can also stimulate local capillary contraction, inhibit blood circulation, and reduce post-injury bleeding. When applying ice compress, it is necessary to control the time of each ice compress and the number of ice compresses per day to ensure the effectiveness of the ice compress while avoiding frostbite. At the same time, the affected limb should be elevated above the level of the heart to return the venous blood of the distal limb to the injured part and reduce the accumulation of blood and body fluids in the injured area.

[0003] Traditional ice compress is to wrap an ice bag with a thin spacer towel and apply it to the affected area. The ice bag is generally water filled in a special ice bag, which is placed in a refrigerator and refrigerated to obtain the ice bag. This method is not convenient for fitting the skin. The actual contact area between the ice bag wrapped by the spacer towel and the skin is small, and the ice compress effect is not good. At the same time, the ice bag needs to be fixed with additional straps and raised separately. The overall process is relatively cumbersome. Therefore, an ice compress device for orthopedic care is proposed. Summary of the invention

[0004] In order to solve the problems in the above background technology that the small fitting area leads to poor ice compress effect and the overall fixing process is complicated, the present invention provides an ice compress device for orthopedic care.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: an ice compress device for orthopedic care, comprising a main support seat, a pair of positioning sliding frames slidably connected to the top of the main support seat, a threaded rod rotatably connected inside the main support seat, a transmission gear is fixedly connected to the middle of the threaded rod, a positioning sliding frame is slidably connected to the upper end of the main support seat, a transmission gear plate is fixedly connected to the middle of the positioning sliding frame, a friction end is fixedly connected to one end of the threaded rod, a friction locking block is arranged on the upper side of the friction end, a fixing bolt is arranged on the top of the friction locking block, a pair of flexible heat conducting plates are rotatably connected to the bottom of the positioning sliding frames, and a refrigeration plate is fixedly connected to the top of the flexible heat conducting plate.

[0006] Preferably, the positioning sliding frame is located on the inner side of the upper end of the main support seat, the positioning sliding frame is distributed at both ends of the threaded rod, the threads at both ends of the threaded rod are arranged opposite to each other, and the threaded rod is threadedly connected to the positioning sliding frame, the threaded rod is located on the inner side of the positioning sliding frame, and the top of the positioning sliding frame penetrates the upper end of the main support seat.

[0007] Preferably, the transmission gear corresponds to the position of the positioning sliding frame, the transmission gear is meshed with the transmission tooth plate, the bottom of the positioning sliding frame is fixedly connected to the middle of the flexible heat conductive plate, and the friction end is located at one end of the threaded rod close to the opening of the main bracket seat.

[0008] Preferably, the friction locking block is slidably connected inside the main support seat, the fixing bolt is threadedly connected to the main support seat, a twist handle is provided on the top of the fixing bolt, and the top of the fixing bolt penetrates the main support seat and extends to the upper end of the main support seat.

[0009] Preferably, the bottom of the friction locking block is an arc-shaped notch matching the friction end head, and a friction layer is provided on the inner side of the arc-shaped notch of the friction locking block, the friction locking block is in conflict with the friction end head, the fixing bolt is located at the top of the friction locking block, and the fixing bolt is rotatably connected to the friction locking block.

[0010] Preferably, when the positioning slide frame drives the transmission tooth plate to move upward, the transmission tooth plate drives the transmission gear to drive the threaded rod to rotate, so that the positioning slide frame is retracted along the middle of the threaded rod, and the friction end head rotates synchronously.

[0011] Preferably, Velcro is provided on both the upper and lower sides of the flexible heat conducting plate, a spacer towel is surrounded on the outside of the flexible heat conducting plate and fixed by the Velcro, the spacer towel surrounds the flexible heat conducting plate and the cooling plate inside, a pair of connection ports is provided on the top of the cooling plate, and a pair of corresponding openings are opened on the spacer towel.

[0012] Preferably, the main support seat is C-shaped, and a pair of control components are fixedly connected to the inner side of the upper end of the main support seat. The control components are distributed on both sides of the positioning sliding frame, and the control components are connected to the connection port on the top of the refrigeration plate through a power transmission line.

[0013] Preferably, an affected limb supporting frame is slidably connected to the inner side of the lower end of the main support seat, a cylinder is fixedly connected to the top of the main support seat, the output end of the cylinder penetrates the main support seat and is fixedly connected to the top of the affected limb supporting frame, and the top of the affected limb supporting frame is arc-shaped.

[0014] Preferably, when the flexible heat conductive plate is squeezed and moves upward, the flexible heat conductive plate pushes the positioning sliding frame to move upward, so that the threaded rod drives the adjusting sliding frame to shrink toward the middle, and the adjusting sliding frame pushes the flexible heat conductive plate to gather toward the middle, so that the middle part of the flexible heat conductive plate bulges upward and bends into an arc shape.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention facilitates shaping of the flexible heat-conducting plate by arranging the cooperation of structures such as the friction end head and the friction locking block, so that the flexible heat-conducting plate is fixed, and the flexible heat-conducting plate is squeezed and fitted to the skin of the affected limb by the flexible heat-conducting plate, and then the fixing bolt is screwed to make the fixing bolt drive the friction locking block to move downward, so that the friction locking block locks the friction end head, the threaded rod is locked, and the positioning sliding frame and the adjustment sliding frame are locked synchronously, so as to keep the shape of the flexible heat-conducting plate unchanged. When the affected limb is subjected to ice compress for multiple times, ice compress can be directly applied without adjusting the shape again during ice compress, thus saving operation time.

[0017] The present invention cooperates with structures such as an affected limb supporting frame, a positioning sliding frame, and a positioning sliding frame to facilitate adjustment of the bending state of the flexible heat-conducting plate. The affected limb is driven to move by the affected limb supporting frame, so that the affected limb squeezes and pushes the flexible heat-conducting plate to bend upward, and the positioning sliding frame is simultaneously pushed to drive the transmission tooth plate to move upward, so that the transmission tooth plate drives the threaded rod to rotate through the transmission gear, and the threaded rod drives the positioning sliding frame to gather toward the middle, so that the flexible heat-conducting plate is bent into an arc shape to fit the skin of the affected limb, thereby conveniently adjusting the bending of the flexible heat-conducting plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention;

[0019] Figure 2 It is a schematic cross-sectional view of the middle part of the present invention;

[0020] Figure 3 It is an enlarged schematic diagram of the position adjustment sliding frame of the present invention;

[0021] Figure 4 It is a cross-sectional schematic diagram of the threaded rod of the present invention;

[0022] Figure 5 It is a schematic cross-sectional view of the middle part of the threaded rod of the present invention;

[0023] Figure 6 This is a cross-sectional disassembly diagram of the flexible heat conductive plate of the present invention.

[0024] In the figure: 1. main support seat; 2. adjustment sliding frame; 3. threaded rod; 4. transmission gear; 5. positioning sliding frame; 6. transmission gear plate; 7. friction end; 8. friction locking block; 9. fixing bolt; 10. flexible heat conductive plate; 11. cooling plate; 12. control component; 13. spacing towel; 14. affected limb support frame; 15. cylinder. DETAILED DESCRIPTION

[0025] 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.

[0026] like Figures 1 to 6 As shown, the present invention provides an ice compress device for orthopedic care, including a main support seat 1, a pair of adjusting sliding frames 2 are slidably connected to the top of the main support seat 1, a threaded rod 3 is rotatably connected inside the main support seat 1, a transmission gear 4 is fixedly connected to the middle of the threaded rod 3, a positioning sliding frame 5 is slidably connected to the upper end of the main support seat 1, a transmission gear plate 6 is fixedly connected to the middle of the positioning sliding frame 5, a friction end 7 is fixedly connected to one end of the threaded rod 3, a friction locking block 8 is arranged on the upper side of the friction end 7, a fixing bolt 9 is arranged on the top of the friction locking block 8, a pair of adjusting sliding frames 2 are rotatably connected to a flexible heat conducting plate 10 at the bottom, and a refrigeration plate 11 is fixedly connected to the top of the flexible heat conducting plate 10.

[0027] The above scheme is adopted: the cylinder 15 drives the affected limb supporting frame 14 to move upward, and the affected limb is driven by the affected limb supporting frame 14 to move, so that the affected limb is lifted by the affected limb supporting frame 14, so that the affected limb is lifted to a suitable position, and at the same time, the affected limb will squeeze and push the flexible heat-conducting plate 10 to bend upward, and synchronously push the positioning sliding frame 5 to drive the transmission gear plate 6 to move upward, so that the transmission gear plate 6 drives the threaded rod 3 to rotate through the transmission gear 4, so that the threaded rod 3 drives the adjustment sliding frame 2 to shrink toward the middle, so that the flexible heat-conducting plate 10 is bent into an arc shape and fits the skin of the affected limb, and then the fixing bolt 9 is screwed, so that the fixing bolt 9 drives the friction locking block 8 to move downward, so that the friction locking block 8 locks the friction end 7, so that the threaded rod 3 is locked, and the positioning sliding frame 5 and the adjustment sliding frame 2 are locked synchronously to keep the shape of the flexible heat-conducting plate 10 unchanged, so that when the affected limb is subjected to ice compresses for multiple times, ice compresses can be directly applied.

[0028] like Figure 4 , Figure 5 and Figure 6As shown, the positioning sliding frame 2 is located on the inner side of the upper end of the main support seat 1, and the positioning sliding frame 2 is distributed at both ends of the threaded rod 3. The threads at both ends of the threaded rod 3 are arranged oppositely, and the threaded rod 3 is threadedly connected to the positioning sliding frame 2, and the threaded rod 3 is located on the inner side of the positioning sliding frame 5. The top of the positioning sliding frame 5 penetrates the upper end of the main support seat 1, and the transmission gear 4 corresponds to the position of the positioning sliding frame 5. The transmission gear 4 is meshed and connected with the transmission tooth plate 6, and the bottom of the positioning sliding frame 5 is fixedly connected to the middle part of the flexible heat conducting plate 10. The friction end 7 is located at one end of the threaded rod 3 close to the opening of the main support seat 1. When the positioning sliding frame 5 drives the transmission tooth plate 6 to move upward, the transmission gear 4 is driven by the transmission tooth plate 6 to drive the threaded rod 3 to rotate, so that the positioning sliding frame 2 is retracted along the middle part of the threaded rod 3, and the friction end 7 rotates synchronously.

[0029] The above scheme is adopted: by setting a positioning sliding frame 2, the flexible heat conductive plate 10 is supported by the positioning sliding frame 2, and when the flexible heat conductive plate 10 bends upward, it is synchronously gathered toward the middle along the threaded rod 3, so that the flexible heat conductive plate 10 can bend upward to form an arc shape, and the threaded rod 3 and the transmission gear 4 are set, and the transmission gear 4 is engaged with the transmission tooth plate 6, so that the transmission gear 4 is driven by the transmission tooth plate 6 to drive the threaded rod 3 to rotate, so as to drive the positioning sliding frame 2 to slide, so as to ensure that the flexible heat conductive plate 10 can bend stably, and at the same time, the positioning sliding frame 5 is set to keep the bending point of the flexible heat conductive plate 10 fixed, so as to avoid the flexible heat conductive plate 10 from being offset when being bent.

[0030] like Figures 3 to 6 As shown, the friction locking block 8 is slidably connected to the inside of the main support seat 1, the fixing bolt 9 is threadedly connected to the main support seat 1, a twist handle is arranged on the top of the fixing bolt 9, the top of the fixing bolt 9 penetrates the main support seat 1 and extends to the upper end of the main support seat 1, the bottom of the friction locking block 8 is an arc-shaped notch matching the friction end 7, and a friction layer is arranged on the inner side of the arc-shaped notch of the friction locking block 8, the friction locking block 8 is in conflict with the friction end 7, the fixing bolt 9 is located at the top of the friction locking block 8, and the fixing bolt 9 is rotatably connected to the friction locking block 8.

[0031] The above scheme is adopted: by setting a friction locking block 8, the friction locking block 8 is in conflict with the friction end head 7, the friction end head 7 is fixed, and the threaded rod 3 is locked synchronously. The setting of the friction end head 7 is that the friction end head 7 rotates with the threaded rod 3, and the threaded rod 3 is locked by locking the friction end head 7. An arc-shaped notch matching the friction end head 7 is provided at the bottom of the friction locking block 8. At the same time, a friction layer is provided inside the friction locking block 8, so that when the friction locking block 8 is in conflict with the friction end head 7, the friction end head 7 can be fixed by friction, and then the threaded rod 3 is locked, so that the positioning sliding frame 5 and the adjustment sliding frame 2 are locked synchronously, so that the flexible heat conducting plate 10 maintains its shape unchanged after bending, and a fixing bolt 9 is provided, and a twisting handle is provided on the top of the fixing bolt 9, so that the fixing bolt 9 is rotated to drive the friction locking block 8 to move up and down, so as to control the movement of the friction locking block 8 to lock or unlock the friction end head 7.

[0032] like Figure 4 , Figure 5 and Figure 6 As shown, Velcro is provided on both the upper and lower sides of the flexible heat conducting plate 10, and the spacer towel 13 is wrapped around the outside of the flexible heat conducting plate 10 and fixed by the Velcro. The spacer towel 13 surrounds the flexible heat conducting plate 10 and the cooling plate 11 inside, and a pair of connection ports are provided on the top of the cooling plate 11, and a pair of corresponding openings are opened on the spacer towel 13.

[0033] The above scheme is adopted: by setting a spacer towel 13, the spacer towel 13 surrounds the flexible heat conductive plate 10 and the cooling sheet 11, when the flexible heat conductive plate 10 is kept warm to a certain extent, the skin of the affected limb is separated from the flexible heat conductive plate 10 and does not directly contact it. The Velcro arranged on the flexible heat conductive plate 10 can facilitate the installation or removal and replacement of the spacer towel 13, and the connection port arranged on the top of the cooling sheet 11 can facilitate the control of the opening and closing of the cooling sheet 11.

[0034] like Figure 1 and Figure 2 As shown, the main support seat 1 is C-shaped, and a pair of control components 12 are fixedly connected to the inner side of the upper end of the main support seat 1. The control components 12 are distributed on both sides of the positioning sliding frame 5. The control components 12 are connected to the connection port on the top of the refrigeration plate 11 through the power transmission line. The inner side of the lower end of the main support seat 1 is slidably connected to the affected limb supporting frame 14, and the top of the main support seat 1 is fixedly connected to the cylinder 15. The output end of the cylinder 15 penetrates the main support seat 1 and is fixedly connected to the top of the affected limb supporting frame 14. The top of the affected limb supporting frame 14 is arc-shaped. When the flexible heat conductive plate 10 is squeezed and moved upward, the positioning sliding frame 5 is pushed upward by the flexible heat conductive plate 10, so that the threaded rod 3 drives the adjustment sliding frame 2 to shrink toward the middle, and the adjustment sliding frame 2 pushes the flexible heat conductive plate 10 to retract toward the middle, so that the middle part of the flexible heat conductive plate 10 bulges upward and bends in an arc shape.

[0035] The above scheme is adopted: by setting a control component 12, the control component 12 is connected to the connection port on the top of the cooling plate 11 through the power transmission line, so as to facilitate the disassembly of the power transmission line and avoid blocking the replacement of the interval towel 13. The control component 12 controls the opening and closing of the cooling plate 11. By setting an affected limb supporting frame 14 and a cylinder 15, the cylinder 15 drives the affected limb supporting frame 14 to move up and down, and the affected limb supporting frame 14 drives the affected limb to move, so that the affected limb supporting frame 14 supports the affected limb. The setting of the affected limb supporting frame 14 is convenient for placing the affected limb, and the affected limb is lifted by the affected limb supporting frame 14, so that the affected limb is lifted to a suitable position to meet the requirements of ice compress. At the same time, when the affected limb supporting frame 14 lifts the affected limb, the flexible heat conductive plate 10 can be pushed upward by squeezing the affected limb, so that the flexible heat conductive plate 10 fits the surface of the affected limb to fit the skin, so as to ensure the effect of ice compress.

[0036] When the flexible heat conductive plate 10 is squeezed and moves upward, the flexible heat conductive plate 10 pushes the positioning sliding frame 5 to move upward, so that the threaded rod 3 drives the adjusting sliding frame 2 to shrink toward the middle, and the adjusting sliding frame 2 pushes the flexible heat conductive plate 10 to retract toward the middle, so that the middle part of the flexible heat conductive plate 10 bulges upward and bends into an arc shape.

[0037] The working principle and use process of the present invention are as follows: when in use, the cylinder 15 drives the affected limb supporting frame 14 to move upward, and the affected limb supporting frame 14 drives the affected limb to move, so that the affected limb supporting frame 14 lifts the affected limb to a suitable position, and at the same time, the affected limb squeezes and pushes the flexible heat conducting plate 10 to bend upward;

[0038] When the flexible heat-conducting plate 10 bends upward, the positioning sliding frame 5 is synchronously pushed to drive the transmission tooth plate 6 to move upward, so that the transmission tooth plate 6 drives the threaded rod 3 to rotate through the transmission gear 4, so that the threaded rod 3 drives the adjustment sliding frame 2 to retract toward the middle, so that the flexible heat-conducting plate 10 is bent into an arc shape and fits the skin of the affected limb, and then the fixing bolt 9 is screwed to make the fixing bolt 9 drive the friction locking block 8 to move downward, so that the friction locking block 8 locks the friction end 7, so that the threaded rod 3 is locked, and the positioning sliding frame 5 and the adjustment sliding frame 2 are synchronously locked to keep the shape of the flexible heat-conducting plate 10 unchanged, so that when the affected limb is subjected to ice compresses for multiple times, ice compresses can be directly applied.

[0039] 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.

[0040] 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 ice compress device for orthopedic care, comprising a main support seat (1), characterized in that: The top of the main support seat (1) is slidably connected to a pair of position adjustment sliding frames (2); a threaded rod (3) is rotatably connected inside the main support seat (1); a transmission gear (4) is fixedly connected to the middle of the threaded rod (3); a positioning sliding frame (5) is slidably connected to the upper end of the main support seat (1); a transmission gear plate (6) is fixedly connected to the middle of the positioning sliding frame (5); one end of the threaded rod (3) is fixedly connected to a friction end head (7); a friction locking block (8) is provided on the upper side of the friction end head (7); a fixing bolt (9) is provided on the top of the friction locking block (8); a pair of position adjustment sliding frames (2) are rotatably connected to a flexible heat conducting plate (10) at the bottom; a cooling plate (11) is fixedly connected to the top of the flexible heat conducting plate (10).

2. The ice compress device for orthopedic care according to claim 1, characterized in that: The positioning sliding frame (2) is located on the inner side of the upper end of the main support seat (1), and the positioning sliding frame (2) is distributed at both ends of the threaded rod (3). The threads at both ends of the threaded rod (3) are arranged opposite to each other, and the threaded rod (3) is threadedly connected to the positioning sliding frame (2). The threaded rod (3) is located on the inner side of the positioning sliding frame (5), and the top of the positioning sliding frame (5) penetrates the upper end of the main support seat (1).

3. The ice compress device for orthopedic care according to claim 1, characterized in that: The transmission gear (4) corresponds to the position of the positioning slide frame (5), the transmission gear (4) is meshedly connected with the transmission tooth plate (6), the bottom of the positioning slide frame (5) is fixedly connected to the middle of the flexible heat conducting plate (10), and the friction end (7) is located at one end of the threaded rod (3) close to the opening of the main support seat (1).

4. The ice compress device for orthopedic care according to claim 1, characterized in that: The friction locking block (8) is slidably connected inside the main support seat (1), the fixing bolt (9) is threadedly connected to the main support seat (1), a twist handle is provided on the top of the fixing bolt (9), and the top of the fixing bolt (9) penetrates the main support seat (1) and extends to the upper end of the main support seat (1).

5. The ice compress device for orthopedic care according to claim 1, characterized in that: The bottom of the friction locking block (8) is an arc-shaped notch matching the friction end head (7), and a friction layer is arranged inside the arc-shaped notch of the friction locking block (8). The friction locking block (8) is in contact with the friction end head (7), and the fixing bolt (9) is located at the top of the friction locking block (8). The fixing bolt (9) is rotatably connected to the friction locking block (8).

6. The ice compress device for orthopedic care according to claim 1, characterized in that: When the positioning slide frame (5) drives the transmission tooth plate (6) to move upward, the transmission tooth plate (6) drives the transmission gear (4) to drive the threaded rod (3) to rotate, so that the positioning slide frame (2) is retracted along the middle part of the threaded rod (3), and the friction end (7) rotates synchronously.

7. The ice compress device for orthopedic care according to claim 1, characterized in that: Velcro is provided on both the upper and lower sides of the flexible heat conducting plate (10); a spacer towel (13) surrounds the outside of the flexible heat conducting plate (10) and is fixed by the Velcro; the spacer towel (13) surrounds the flexible heat conducting plate (10) and the refrigeration plate (11) inside; a pair of connection ports is provided on the top of the refrigeration plate (11); and a pair of corresponding openings are opened on the spacer towel (13).

8. The ice compress device for orthopedic care according to claim 1, characterized in that: The main support seat (1) is C-shaped, and a pair of control components (12) are fixedly connected to the inner side of the upper end of the main support seat (1). The control components (12) are distributed on both sides of the positioning sliding frame (5), and the control components (12) are connected to the connection port on the top of the refrigeration plate (11) through a power transmission line.

9. The ice compress device for orthopedic care according to claim 1, characterized in that: The inner side of the lower end of the main support seat (1) is slidably connected to an affected limb supporting frame (14), the top of the main support seat (1) is fixedly connected to a cylinder (15), the output end of the cylinder (15) penetrates the main support seat (1) and is fixedly connected to the top of the affected limb supporting frame (14), and the top of the affected limb supporting frame (14) is in an arc shape.

10. The ice compress device for orthopedic care according to claim 1, characterized in that: When the flexible heat conducting plate (10) is squeezed and moves upward, the flexible heat conducting plate (10) pushes the positioning sliding frame (5) to move upward, so that the threaded rod (3) drives the positioning sliding frame (2) to shrink toward the middle, and the positioning sliding frame (2) pushes the flexible heat conducting plate (10) to gather toward the middle, so that the middle of the flexible heat conducting plate (10) bulges upward and bends into an arc shape.

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