Orthopedic tractor fixing device

Abstract

The utility model relates to the technical field of medical instruments, and discloses an orthopedic tractor fixing device which comprises a supporting mechanism, an elastic piece and a fixing mechanism. The supporting mechanism is arranged on the fixing mechanism in a sleeving mode, the supporting mechanism extends in the height direction of the fixing mechanism, and the supporting mechanism is detachably connected with the fixing mechanism in a sliding mode so that the supporting mechanism can drive the tractor to reciprocate in the height direction of the fixing mechanism, and therefore the installation height of the tractor is adjusted. The supporting mechanism and the fixing mechanism are arranged to meet the mounting requirements of legs of patients with different heights, the elastic part is arranged between the supporting mechanism and the fixing mechanism, and the two ends of the elastic part abut against the supporting mechanism and the fixing mechanism respectively, so that the elastic part can buffer the patient and avoid hard contact with the patient. The technical problems that in the prior art, a tractor cannot be aligned with the legs of the patient, and traction cannot be conducted are solved, and the technical effects that the installation height of the tractor can be adjusted, and the application range is wider are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to an orthopedic traction device fixing device. Background Art

[0002] When a person suffers from severe trauma such as tibia and fibula fractures, shaft fractures, pelvic fractures or hip dislocation, the calcaneus needs to be pulled. A traction frame is set up on the bed, and traction weights are set on the traction frame. The weight of the traction weights is used as traction force on the calcaneus to relieve muscle tension and strong contraction, thereby achieving the effect of correction and reduction.

[0003] The operating table and orthopedic traction frame are two separate pieces of equipment in the operating room. During lower limb traction surgery, the traction frame must be mounted on the operating table. However, traction frames are large and heavy, so a small cart is often placed underneath them to facilitate installation, transportation, and storage.

[0004] Currently, when an orthopedic traction frame is stored on a trolley, there is a risk of shaking and slipping under external force. The traction frame needs to be fixed to one side of the operating table. During the installation of the traction frame and the operating table, the orthopedic traction frame is rigidly connected as a whole, and the height cannot be adjusted on the trolley, so the traction frame cannot be aligned with the patient's legs, and traction cannot be performed, affecting normal use. Utility Model Content

[0005] The utility model aims to provide an orthopedic traction device fixing device, which solves the technical problem in the prior art that the traction frame cannot be aligned with the patient's legs and cannot perform traction.

[0006] In order to solve the above technical problems, the utility model provides an orthopedic traction device fixing device, comprising a supporting mechanism, an elastic member and a fixing mechanism;

[0007] The supporting mechanism is sleeved on the fixing mechanism, the supporting mechanism is extended along the height direction of the fixing mechanism, and the supporting mechanism is slidably and detachably connected to the fixing mechanism;

[0008] The elastic member is arranged between the supporting mechanism and the fixing mechanism, and two ends of the elastic member are respectively in contact with the supporting mechanism and the fixing mechanism.

[0009] In an optional embodiment, a friction component is further provided between the supporting mechanism and the fixing mechanism;

[0010] The friction assembly is sleeved on the fixing mechanism, the friction assembly is connected to the supporting mechanism, and the friction assembly is slidably connected to the fixing mechanism.

[0011] In an optional embodiment, the support mechanism includes a first limit block and a second limit block, and the friction assembly includes a first friction plate and a second friction plate;

[0012] The first limit block and the second limit block are arranged at intervals along the width direction of the fixing mechanism, the first limit block is connected to the first friction plate, and the first limit block is slidably connected to the fixing mechanism through the first friction plate, the second limit block is connected to the second friction plate, and the second limit block is slidably connected to the fixing mechanism through the second friction plate.

[0013] In an optional embodiment, a through hole is provided on the support mechanism, and a protrusion is provided on the friction assembly, and the protrusion extends into the through hole and is clamped.

[0014] In an optional embodiment, a locking member is further included, a threaded hole is provided on the support mechanism, the threaded hole passes through the support mechanism, the locking member is connected to the threaded hole, and the locking member is close to or away from the fixing mechanism through the threaded hole.

[0015] In an optional embodiment, the support mechanism includes a receiving platform and a connecting column;

[0016] The receiving platform is arranged on a side of the connecting column away from the fixing mechanism, and a groove is provided on one end of the receiving platform away from the connecting column, and the width of the groove increases in a direction away from the connecting column;

[0017] The connecting column is sleeved on the fixing mechanism and is slidably connected to the fixing mechanism.

[0018] In an optional embodiment, a limiting hole and a limiting column are provided on the connecting column, and the limiting column and the limiting hole are threadedly connected;

[0019] A limiting groove is provided on the fixing mechanism, and one end of the limiting column is extended into the limiting groove.

[0020] In an optional embodiment, the fixing mechanism includes a frame and a support column;

[0021] The support columns are extended along the height direction of the frame, the frame is connected to the support columns, each of the support columns is slidably connected to a connecting column, and each of the support columns is provided with a limiting groove extending along the length direction of the support column.

[0022] In an optional embodiment, a guide column is provided on the support column, and the elastic member is sleeved on the guide column.

[0023] In an optional embodiment, the fixing mechanism further includes a limiting pin;

[0024] The limiting pin and the supporting column are spaced apart along the length direction of the frame, the limiting pin is connected to the frame, and the limiting pin abuts against the orthopedic traction device.

[0025] The utility model provides an orthopedic traction device fixing device, including a supporting mechanism, an elastic member and a fixing mechanism; the supporting mechanism is mounted on the fixing mechanism, the supporting mechanism is extended along the height direction of the fixing mechanism, and the supporting mechanism and the fixing mechanism are slidably and detachably connected, so that the supporting mechanism can drive the traction device to reciprocate along the height direction of the fixing mechanism, thereby adjusting the installation height of the traction device to meet the installation requirements of the legs of patients of different heights; the elastic member is arranged between the supporting mechanism and the fixing mechanism, and the two ends of the elastic member are respectively in contact with the supporting mechanism and the fixing mechanism, so that the elastic member can cushion the patient and avoid hard contact with the patient. The utility model solves the technical problem in the prior art that the traction device cannot be aligned with the patient's leg and cannot be pulled, and achieves the technical effect of being able to adjust the installation height of the traction device and having a wider range of uses. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a structural diagram of the orthopedic traction device fixation device mentioned in an embodiment of the present utility model;

[0027] Figure 2 This is a structural diagram of the fixing mechanism mentioned in the embodiment of the present utility model;

[0028] Figure 3 This is a schematic structural diagram of the first limiting block mentioned in an embodiment of the present utility model;

[0029] Figure 4 This is a schematic structural diagram of the friction assembly mentioned in an embodiment of the present utility model;

[0030] Figure 5 This is a schematic structural diagram of the guide column mentioned in an embodiment of the present utility model;

[0031] Figure 6 This is a schematic structural diagram of the second limiting block mentioned in an embodiment of the present utility model.

[0032] In the figure, 1-elastic part; 2-friction assembly; 3-first limit block; 4-second limit block; 5-through hole; 6-protrusion; 7-locking part; 8-supporting platform; 9-connecting column; 10-limiting hole; 11-limiting column; 12-limiting groove; 13-frame; 14-support column; 15-guide column; 16-limiting pin. DETAILED DESCRIPTION

[0033] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0034] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0035] In related technologies, when an orthopedic traction frame is stored on a trolley, there is a risk of shaking and slipping under the action of external forces. The traction frame needs to be fixed to one side of the operating table. During the installation of the traction frame and the operating table, since the orthopedic traction frame is rigidly connected as a whole, the height cannot be adjusted on the trolley, so the traction frame cannot be aligned with the patient's legs, and traction cannot be performed, affecting normal use.

[0036] In view of this, if Figures 1 to 6 As shown, some embodiments of the present invention provide an orthopedic traction device fixation device, including a supporting mechanism, an elastic member 1 and a fixing mechanism; the supporting mechanism is sleeved on the fixing mechanism, the supporting mechanism is extended along the height direction of the fixing mechanism, and the supporting mechanism and the fixing mechanism are slidably and detachably connected; the elastic member 1 is arranged between the supporting mechanism and the fixing mechanism, and the two ends of the elastic member 1 are respectively abutted against the supporting mechanism and the fixing mechanism.

[0037] In the above embodiment, the support mechanism can be set to a metal material, the support mechanism can be sleeved on one side of the fixing mechanism, the support mechanism can be set close to the patient's feet, and the support mechanism can be detachably connected to the tractor, so that when the tractor needs to tract the patient, it can be first fixed on the support mechanism and then fixed on the operating bed. After the work is completed, the tractor is separated from the operating bed, the support mechanism is slidably connected to the fixing mechanism, and the support mechanism is detachably connected to the fixing mechanism, so that when the support mechanism slides relative to the fixing mechanism, after sliding to the position where it needs to be installed, the support mechanism can be fixed and released through the detachable connection, so that the support mechanism can support the tractor to reach a specified height. Furthermore, as Figure 1 As shown, the support mechanism can move up and down so that the support mechanism can reach a specified installation height, and the elastic member 1 can be set as a spring, the axis of the spring is arranged parallel to the height direction of the fixing mechanism, and the two ends of the spring are respectively in contact with the inner wall of the support mechanism and the fixing mechanism. After the traction device is placed on the support mechanism, the spring can act as a buffer when the patient's legs are placed on the traction device to avoid hard contact.

[0038] The utility model provides an orthopedic traction device fixing device, comprising a supporting mechanism, an elastic member 1 and a fixing mechanism; the supporting mechanism is sleeved on the fixing mechanism, the supporting mechanism is extended along the height direction of the fixing mechanism, and the supporting mechanism and the fixing mechanism are slidably and detachably connected, so that the supporting mechanism can drive the traction device to reciprocate along the height direction of the fixing mechanism, thereby adjusting the installation height of the traction device to meet the installation requirements of the legs of patients of different heights, the elastic member 1 is arranged between the supporting mechanism and the fixing mechanism, and the two ends of the elastic member 1 are respectively in contact with the supporting mechanism and the fixing mechanism, so that the elastic member 1 can cushion the patient and avoid hard contact with the patient. The utility model solves the technical problem in the prior art that the traction device cannot be aligned with the patient's leg and cannot be pulled, and achieves the technical effect of being able to adjust the installation height of the traction device and having a wider range of uses.

[0039] In an optional embodiment, a friction assembly 2 is further provided between the supporting mechanism and the fixing mechanism; the friction assembly 2 is sleeved on the fixing mechanism, the friction assembly 2 is connected to the supporting mechanism, and the friction assembly 2 is slidably connected to the fixing mechanism.

[0040] In the above embodiment, the friction component 2 can be made of rubber or silicone. The friction component 2 is sleeved on the fixing mechanism along the surface of the fixing mechanism, and the supporting mechanism is provided with a cavity. The cavity of the supporting mechanism is sleeved on the fixing mechanism so that the supporting mechanism and the fixing mechanism are slidably connected. The friction component 2 is tightly provided on the inner wall of the cavity of the supporting mechanism. The friction component 2 can be fixed to the supporting mechanism by gluing or bolting, so that the supporting mechanism can carry the friction component 2 to rub the surface of the fixing mechanism, so that the friction component 2 can move relative to the fixing mechanism. By setting the friction component 2, a gap can be avoided between the cavity of the supporting mechanism and the fixing mechanism, thereby causing the supporting mechanism to shake. At the same time, the supporting mechanism can also move slowly relative to the fixing mechanism to avoid excessive movement speed causing discomfort to the patient.

[0041] In an optional embodiment, the support mechanism includes a first limit block 3 and a second limit block 4, and the friction assembly 2 includes a first friction plate and a second friction plate; the first limit block 3 and the second limit block 4 are arranged at intervals along the width direction of the fixing mechanism, the first limit block 3 is connected to the first friction plate, and the first limit block 3 is slidingly connected to the fixing mechanism through the first friction plate, the second limit block 4 is connected to the second friction plate, and the second limit block 4 is slidingly connected to the fixing mechanism through the second friction plate.

[0042] In the above embodiment, the first limit block 3 and the second limit block 4 can be set at the same height, the first limit block 3 and the second limit block 4 can be arranged symmetrically, the first limit block 3 and the second limit block 4 are both used to receive the traction device, and the first friction plate is connected to the cavity of the first limit block 3, and the second friction plate is connected to the cavity of the second limit block 4. The first friction plate and the second friction plate have the same shape, and a flange is provided on one side of the first friction plate and the second friction plate for abutting the opening of the cavity. The first friction plate and the second friction plate are both provided with four friction plates, and the four friction plates are evenly arranged along the circumference of the fixing mechanism, so that when the fixing mechanism is rectangular, the four friction plates are respectively attached to one surface of the fixing mechanism, so that the first friction plate and the second friction plate are respectively firmly attached to the fixing mechanism.

[0043] In an optional embodiment, a through hole 5 is provided on the support mechanism, and a protrusion 6 is provided on the friction assembly 2 , and the protrusion 6 extends into the through hole 5 and is engaged therewith.

[0044] In the above embodiment, the first limit block 3 and the second limit block 4 are symmetrically arranged, and the shapes of the first friction plate and the second friction plate are consistent. Taking the first limit block 3 and the first friction plate as an example, a through hole 5 that passes through the cavity is provided on the side wall of the first limit block 3. The through hole 5 can be circular, and a cylindrical protrusion 6 is correspondingly provided on the side of the first friction plate facing the first limit block 3. After the first friction plate is extended into the cavity and the flange abuts against the open end of the cavity, the protrusion 6 on the first friction plate is stuck in the through hole 5 on the side wall of the first limit block 3, so that the first limit block 3 and the first friction plate are firmly connected.

[0045] In an optional embodiment, a locking member 7 is further included. A threaded hole is provided on the support mechanism, and the threaded hole penetrates the support mechanism. The locking member 7 is connected to the threaded hole, and the locking member 7 is moved close to or away from the fixing mechanism through the threaded hole.

[0046] In the above embodiment, the first limit block 3 and the second limit block 4 are arranged symmetrically. Taking the first limit block 3 as an example, a threaded hole is correspondingly provided at the cavity of the first limit block 3, which passes through the first limit block 3 and is connected to the cavity. The threaded hole can be set at the corner position of the first limit block 3 and extends along the diagonal of the cavity, and the locking member 7 can be set as a locking bolt, which is threadedly connected to the threaded hole. A rotating handle can be provided on the side of the locking member 7 facing away from the cavity. The operator can rotate the bolt by rotating the handle so that the bolt extends into the cavity and abuts against the outer wall of the fixing mechanism. Among them, since the first friction plate can be set as four pieces, the locking member 7 can extend into the gap between two adjacent friction plates and abut against the fixing mechanism, so that the first limit block 3 is firmly connected to the fixing mechanism. After the first limit block 3 and the second limit block 4 are adjusted to their positions, the two locking members 7 can be used to lock the first limit block 3 and the second limit block 4 respectively, so that the tractor is more secure during traction and prevent the tractor from moving up and down under the action of the elastic member 1.

[0047] In an optional embodiment, the supporting mechanism includes a receiving platform 8 and a connecting column 9; the receiving platform 8 is arranged on the side of the connecting column 9 away from the fixing mechanism, and a groove is provided at one end of the receiving platform 8 away from the connecting column 9, and the width of the groove is arranged to increase in the direction away from the connecting column 9; the connecting column 9 is sleeved on the fixing mechanism and is slidably connected to the fixing mechanism.

[0048] In the above embodiment, the receiving platform 8 and the connecting column 9 can be made of metal. The first limit block 3 and the second limit block 4 are symmetrically arranged. The first limit block 3 includes a receiving platform 8 and a connecting column 9. The second limit block 4 also includes a receiving platform 8 and a connecting column 9. Taking the first limit block 3 as an example, one end of the connecting column 9 is provided with an opening, a cavity is provided in the connecting column 9, and a threaded hole is provided on the side wall of the connecting column 9. The cross-section of the connecting column 9 can be rectangular. The connecting column 9 is sleeved on the fixing mechanism through the first friction plate, and the receiving platform 8 is provided at the end of the connecting column 9 away from the fixing mechanism. The receiving platform 8 can be welded. The receiving platform 8 is connected to the connecting column 9 in a connecting manner. A groove is provided at one end of the receiving platform 8 away from the connecting column 9. The groove can be extended along the width direction of the fixing mechanism. The width of the groove is gradually increased in the direction away from the fixing mechanism, and the side walls on both sides of the groove are symmetrically arranged, so that when the receiving platform 8 abuts against the tractor, the lower end of the tractor enters the groove through the chamfer at the opening of the groove and abuts against the inner wall of the groove, so that the lower end of the tractor is conveniently stuck in the groove, and a fixing hole can also be provided on the side wall of the receiving platform 8. The tractor can be locked in conjunction with the groove through the fixing hole and the locking member 7, so that the connection of the tractor is more stable.

[0049] In an optional embodiment, a limiting hole 10 and a limiting column 11 are provided on the connecting column 9, and the limiting column 11 and the limiting hole 10 are threadedly connected; a limiting groove 12 is provided on the fixing mechanism, and one end of the limiting column 11 extends into the limiting groove 12.

[0050] In the above embodiment, the first limit block 3 and the second limit block 4 are arranged symmetrically. Taking the first limit block 3 as an example, the limit hole 10 on the connecting column 9 passes through the connecting column 9 and is connected to the cavity. The limit hole 10 can be set to be circular, and the limit column 11 can be connected to the limit hole 10 by a thread. The limit column 11 can be set away from the first friction plate, that is, the limit hole 10 can be set on the side of the through hole 5 away from the cavity opening, and a limit groove 12 corresponding to the moving path of the limit hole 10 is provided on the fixing mechanism. The limit groove 12 is long and extends along the moving path of the connecting column 9, so that the limit column 11 can be extended into the cavity and into the limit groove 12 after cooperating with the limit hole 10, so that during the movement of the connecting column 9, the limit column 11 is driven to reciprocate in the limit groove 12 by the connecting column 9, and the limit column 11 abuts against the side wall of the limit groove 12 to limit the moving path of the connecting column 9, thereby preventing the connecting column 9 from slipping out through the fixing mechanism.

[0051] In an optional embodiment, the fixing mechanism includes a frame 13 and a support column 14; the support column 14 is extended along the height direction of the frame 13, the frame 13 is connected to the support column 14, each support column 14 is slidably connected to a connecting column 9, and each support column 14 is provided with a limiting groove 12 extending along the length direction of the support column 14.

[0052] In the above embodiment, the frame 13 and the support column 14 can both be made of metal, and the frame 13 can be connected to the support column 14 by welding, wherein the support column 14 can be set as a rectangular metal column with a rectangular cross-section. In order to reduce weight, the support column 14 can be hollow inside. There can be two support columns 14, and the two support columns 14 are slidably connected to the first limit block 3 and the second limit block 4 through the first friction plate and the second friction plate respectively. Each support column 14 is provided with an elastic member 1 and a limit groove 12, wherein the two support columns 14 are parallel to each other and have the same height. The two support columns 14 are arranged at one end of the frame 13, and each support column 14 is connected to the frame 13 through a reinforcing rib to make the support column 14 more firm. Furthermore, rollers can be provided under the frame 13, and four rollers can be provided. The four rollers are respectively arranged at the four corners of the frame 13, and each roller can adopt a universal wheel with a brake to make the frame 13 move more smoothly.

[0053] In an optional embodiment, a guide column 15 is provided on the support column 14 , and the elastic member 1 is sleeved on the guide column 15 .

[0054] In the above embodiment, the guide column 15 can be set to a cylindrical shape, and there are two guide columns 15. Each support column 14 is provided with a guide column 15. The guide column 15 is set at the end of the support column 14 away from the ground. The guide column 15 is set perpendicular to the surface of the support column 14. The guide column 15 can be connected to the end face of the support column 14 by welding or threaded connection. An elastic part 1 is sleeved on each guide column 15, and each guide column 15 is used to fix the elastic part 1 to avoid the two elastic parts 1 being compressed and deformed and moved when the first limit block 3 and the second limit block 4 are moving.

[0055] In an optional embodiment, the fixing mechanism further includes a limit pin 16 ; the limit pin 16 and the support column 14 are spaced apart along the length direction of the frame 13 , the limit pin 16 is connected to the frame 13 , and the limit pin 16 abuts against the orthopedic traction device.

[0056] In the above embodiment, a plurality of limit pins 16 may be provided, and the plurality of limit pins 16 are arranged at intervals along the width direction of the frame 13, and the limit pins 16 and the support columns 14 are respectively provided on the two end faces in the length direction of the frame 13. The limit pins 16 are used to fix the guide rail of the tractor to prevent the tractor from moving during traction.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An orthopedic traction device fixing device for fixing an orthopedic traction device, characterized in that: It comprises a supporting mechanism, an elastic member (1) and a fixing mechanism; The supporting mechanism is sleeved on the fixing mechanism, the supporting mechanism is extended along the height direction of the fixing mechanism, and the supporting mechanism is slidably and detachably connected to the fixing mechanism; The elastic member (1) is arranged between the supporting mechanism and the fixing mechanism, and two ends of the elastic member (1) are respectively in contact with the supporting mechanism and the fixing mechanism; A friction component (2) is further provided between the supporting mechanism and the fixing mechanism; The friction component (2) is sleeved on the fixing mechanism, the friction component (2) is connected to the supporting mechanism, and the friction component (2) is slidably connected to the fixing mechanism.

2. The orthopedic traction device according to claim 1, characterized in that: The support mechanism comprises a first limit block (3) and a second limit block (4), and the friction assembly (2) comprises a first friction plate and a second friction plate; The first limiting block (3) and the second limiting block (4) are arranged at intervals along the width direction of the fixing mechanism, the first limiting block (3) is connected to the first friction plate, the first limiting block (3) is slidably connected to the fixing mechanism through the first friction plate, the second limiting block (4) is connected to the second friction plate, and the second limiting block (4) is slidably connected to the fixing mechanism through the second friction plate.

3. The orthopedic traction device according to claim 1, characterized in that: A through hole (5) is provided on the support mechanism, a protrusion (6) is provided on the friction assembly (2), and the protrusion (6) extends into the through hole (5) and is clamped.

4. The orthopedic traction device according to claim 1, characterized in that: It also includes a locking member (7), a threaded hole is provided on the support mechanism, the threaded hole is set through the support mechanism, the locking member (7) is connected to the threaded hole, and the locking member (7) is set close to or away from the fixing mechanism through the threaded hole.

5. The orthopedic traction device according to claim 1, characterized in that: The supporting mechanism further comprises a receiving platform (8) and a connecting column (9); The receiving platform (8) is arranged on a side of the connecting column (9) away from the fixing mechanism, and a groove is provided at one end of the receiving platform (8) away from the connecting column (9), and the width of the groove increases in a direction away from the connecting column (9); The connecting column (9) is sleeved on the fixing mechanism and is slidably connected to the fixing mechanism.

6. The orthopedic traction device according to claim 5, characterized in that: The connecting column (9) is provided with a limiting hole (10) and a limiting column (11), and the limiting column (11) and the limiting hole (10) are threadedly connected; A limiting groove (12) is provided on the fixing mechanism, and one end of the limiting column (11) is extended into the limiting groove (12).

7. The orthopedic traction device according to claim 6, characterized in that: The fixing mechanism comprises a frame (13) and a support column (14); The support columns (14) are arranged to extend along the height direction of the frame (13), the frame (13) is connected to the support columns (14), each of the support columns (14) is slidably connected to one of the connecting columns (9), and each of the support columns (14) is provided with a limiting groove (12) extending along the length direction of the support column (14).

8. The orthopedic traction device according to claim 7, characterized in that: A guide column (15) is provided on the support column (14), and the elastic member (1) is sleeved on the guide column (15).

9. The orthopedic traction device according to claim 8, characterized in that: The fixing mechanism further includes a limiting pin (16); The limiting pin (16) and the supporting column (14) are spaced apart along the length direction of the frame (13), the limiting pin (16) is connected to the frame (13), and the limiting pin (16) abuts against the orthopedic traction device.

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