Swing cutting sternum saw capable of limiting depth

Abstract

The utility model belongs to the technical field of medical auxiliary instruments, and discloses a depth-limitable swing cutting sternum saw which comprises a shell, a cutting assembly and a positioning assembly, the cutting assembly is partially inserted into the shell, the cutting assembly can selectively rotate relative to the shell, the cutting assembly comprises a cutting saw head, scales are arranged on the side wall of the cutting saw head, and the positioning assembly is arranged on the shell. The positioning assembly comprises a rail part, a moving plate and a positioning part, the moving plate is slidably arranged in the rail part and can be self-locked at the stop position, a mounting groove is formed in the end, facing the cutting saw head, of the moving plate, part of the area of the positioning part is placed in the mounting groove, and the positioning part moves along with the moving plate. And finally, staying at a preset cutting depth position. According to the swinging sternum cutting saw capable of limiting the depth, the sternum cutting depth can be accurate and the cutting saw head can rotate when a medical worker performs an operation, so that the medical worker has a sufficient operation space, and the quality of a sternum cutting operation is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of medical auxiliary equipment, in particular to a swing-cutting sternum saw capable of limiting the depth. Background Art

[0002] The sternum is located in the middle of the anterior chest wall. It is a flat bone that is wide at the top and narrow at the bottom, convex in front and concave in the back. It is divided into three parts: the manubrium, the body of the sternum and the xiphoid process. Since the first median sternotomy heart surgery will cause posterior sternal adhesions, the conventional sternum cutting saw cannot be used in the second or more heart surgeries. Therefore, in the second or subsequent surgeries, a swinging cutting sternum saw will be used to open the sternum so that the surgeon can perform subsequent surgical operations.

[0003] When using an oscillating sternum saw, the doctor will fix the patient on the operating table and ensure that the patient is in an appropriate position. Then, the doctor will carefully operate the oscillating sternum saw to ensure accurate cutting of the sternum while minimizing damage to the organs and tissues behind the sternum. The existing oscillating sternum saw often requires the doctor to visually observe the cutting depth of the saw and the feel of the operation, which will cause the problem of insufficient cutting depth. If the cutting depth of the saw is too large or the cutting depth does not meet the predetermined requirements, it may cause medical accidents and even endanger the patient's life safety.

[0004] On the other hand, when performing sternum cutting, medical staff may face the problem of difficulty in cutting the edge of the sternum due to the cutting saw occupying the operating space or angle, which affects the quality of the sternum cutting operation of medical staff, and further affects subsequent surgical operations and even the safety of patients.

[0005] Therefore, there is an urgent need for a swing-cutting sternum saw with a limited depth to solve the above-mentioned technical problems. Utility Model Content

[0006] The utility model aims to provide a swinging sternum saw with a limited depth, which can ensure that the sternum cutting depth is accurate when the medical staff performs the operation, effectively ensuring the life safety of the patient during the operation. At the same time, the cutting saw head can rotate, so that the medical staff has sufficient operating space and ensures the quality of the sternum cutting operation.

[0007] To achieve this purpose, the utility model adopts the following technical solutions:

[0008] A sternum saw with a limited depth and an oscillating cutting mechanism, comprising:

[0009] A housing and a cutting assembly, wherein the cutting assembly is partially inserted into the housing and the cutting assembly can selectively rotate relative to the housing;

[0010] The cutting assembly comprises a cutting saw head, and a side wall of the cutting saw head is provided with scales;

[0011] The positioning assembly includes a track member, a movable plate and a positioning member. The movable plate is slidably arranged in the track member and can self-lock in a stop position. An installation groove is provided at one end of the movable plate facing the cutting saw head. Part of the positioning member is located in the installation groove, and the positioning member can move together with the movable plate.

[0012] As an optimal technical solution for the swinging cutting sternum saw with a limited depth, the swinging cutting sternum saw with a limited depth also includes a driving assembly, and the cutting assembly also includes a connecting piece, and the connecting piece is connected between the driving assembly and the cutting saw head. When the driving assembly is running, the connecting piece drives the cutting saw head to swing.

[0013] As a preferred technical solution for the swing-cutting sternum saw with a limited depth, the cutting saw head includes a cutting saw and a fixing clamp, the cutting saw is detachable in the fixing clamp, and the fixing clamp is connected to the connecting piece.

[0014] As a preferred technical solution for the swing-cutting sternum saw with a limitable depth, the swing-cutting sternum saw with a limitable depth also includes a reset assembly, the reset assembly includes a first elastic member, a toggle member and a connecting rope, the driving assembly has an extension member, the toggle member has a bending portion, the inner wall of the bending portion abuts against the extension member, the first elastic member is fixed to the track member, the toggle member is connected to the first elastic member, the connecting rope is connected between the positioning member and the first elastic member, the movable plate can always self-lock in the stop position, when the positioning member touches the sternum, the positioning member can move in the mounting groove, the toggle member toggle the extension member, and the extending end of the driving assembly is away from the connecting member.

[0015] As a preferred technical solution of the swing-cutting sternum saw with a limited depth, the track member includes a slide rail and a bottom plate, the bottom plate is laid in the slide rail, and the first elastic member is fixed to the bottom plate;

[0016] And / or, the reset assembly also includes a rotating knob, the rotating knob is located on the base plate, the rotating knob includes a screw cover, a rotating shaft is provided inside the rotating knob, the screw cover is connected to the rotating shaft, the first elastic member is a volute spring, the volute spring is arranged around the rotating shaft, when the first elastic member is pulled, the screw cover rotates, and a distance measuring instrument is provided on the screw cover.

[0017] As an optimal technical solution for a swing-cutting sternum saw with a limited depth, the positioning member includes a telescopic part and a main body, the telescopic part is located on the side of the main body, the telescopic part can be selectively placed in the main body, and when the positioning member touches the sternum, the telescopic part is located in the main body, and the main body can move in the mounting groove.

[0018] As a preferred technical solution for a swing-cutting sternum saw with a limited depth, the driving assembly includes a driving motor, a second elastic member and a driving gear. The output end of the driving motor has a connecting column, and the connecting column is made of a flexible material. The second elastic member is sleeved on the connecting column, and the second elastic member is connected to the driving gear. The protruding member is located on both sides of the driving gear, and a through hole is provided at a position opposite to the protruding member, and the protruding member protrudes out of the through hole.

[0019] As an optimal technical solution for a swing-cutting sternum saw with a limited depth, the cutting assembly includes a fixed surface shell, wherein the fixed surface shell is partially placed in the shell, the connecting member is located inside the fixed surface shell, and the connecting member can rotate together with the fixed surface shell, the cutting saw head is located on the side of the fixed surface shell, the connecting member includes a connecting gear, a connecting rod, a cam and a connecting plate, the connecting plate is arranged in the fixed surface shell, the connecting gear is placed on the connecting plate, the connecting gear and the driving gear are meshed with each other, the cutting saw head is connected to the cam, and the connecting rod is connected between the connecting gear and the cam.

[0020] As an optimal technical solution for a swing-cutting sternum saw with a limited depth, a locking button is provided on the fixed surface shell, and the locking button has a latch. A mounting hole corresponding to the locking button is provided on the shell, and the latch can be selectively inserted into the mounting hole. The locking button has a pressing piece. When the pressing piece is pressed for the first time, the latch is inserted into the mounting hole, and the cutting assembly is fixed to the shell. When the pressing piece is pressed again, the latch retracts, and the cutting assembly can rotate relative to the shell.

[0021] As a preferred technical solution of the swing-cutting sternum saw with a limitable depth, the swing-cutting sternum saw with a limitable depth comprises a rubber sleeve, and the rubber sleeve is sleeved outside the shell.

[0022] The beneficial effects of the swing-cutting sternum saw with limited depth provided by the utility model are:

[0023] 1. By arranging the cutting assembly and the shell to be rotatable relative to each other, the cutting saw head can be rotated relative to the shell, which effectively solves the problem that when medical staff use a swing cutting sternum saw with a limited depth to perform surgery, the assembly part of the cutting saw head occupies the operating space, resulting in difficult cutting operations. At this time, the medical staff only needs to flip the cutting saw head to the other side to cut the occupied space area, thereby reducing the difficulty of operation for medical staff.

[0024] 2. By setting scales on the side wall of the cutting saw head and setting a positioning component, when the medical staff uses a swinging cutting sternum saw with a limited depth to perform sternum cutting surgery on the patient, the movable plate drives the positioning member to move, and according to the predetermined cutting depth, the positioning member is moved to the corresponding scale on the cutting saw head. At this time, the positioning member is located on the side of the cutting saw head. At the same time, since the moving member can be self-locked on the track member, when the medical staff performs the cutting surgery, when the cutting reaches the predetermined depth, the cutting will not continue. The medical staff can achieve accurate cutting depth during the surgical operation, improve the operating level of the cutting surgery, improve the safety of the patient's surgery, and reduce the occurrence of medical accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the swing-cutting sternum saw with limited depth provided by the utility model;

[0026] Figure 2 It is a cross-sectional schematic diagram of the swing-cutting sternum saw with limited depth provided by the utility model;

[0027] Figure 3 yes Figure 2 Enlarged view of part A in the middle;

[0028] Figure 4 It is a schematic diagram of the cutting assembly structure of the swing-cutting sternum saw with limited depth provided by the utility model;

[0029] Figure 5 It is a schematic structural diagram of a positioning assembly and a resetting assembly of a swing-cutting sternum saw capable of limiting depth provided by the utility model;

[0030] Figure 6 The utility model is a schematic diagram of the structure of a toggle member and a protruding member of a swing-cutting sternum saw capable of limiting depth provided by the utility model.

[0031] In the figure:

[0032] 1. Shell; 11. Through hole; 12. Shell body; 13. Hand-held part;

[0033] 2. Cutting assembly; 21. Cutting saw head; 211. Cutting saw; 212. Fixing clamp; 22. Connecting piece; 221. Connecting gear; 222. Connecting rod; 223. Cam; 224. Connecting plate;

[0034] 23. Fix the cover; 231. Lock button;

[0035] 3. Positioning assembly; 31. Track member; 311. Slide rail; 312. Bottom plate; 32. Moving plate; 321. Mounting slot; 33. Positioning member; 331. Telescopic part; 332. Main body;

[0036] 4. driving assembly; 41. extending member; 42. driving motor; 421. connecting column; 43. second elastic member; 44. driving gear;

[0037] 5. Reset assembly; 51. Toggle member; 511. Bending portion; 52. Connecting rope; 53. Turning knob. DETAILED DESCRIPTION

[0038] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0039] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0041] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0042] like Figure 1 and Figure 2 As shown in , this embodiment provides a swing cutting sternum saw with a limited depth, including a housing 1 and a cutting assembly 2, wherein the housing 1 includes a housing body 12 and a hand-held portion 13, which is convenient for medical staff to pick up and operate. Part of the cutting assembly 2 is inserted into the housing body 12 of the housing 1, wherein the cutting assembly 2 includes a cutting saw head 21, and the cutting assembly 2 can selectively rotate relative to the housing 1, so that the cutting saw head 21 can rotate relative to the housing 1. When medical staff use the swing cutting sternum saw with a limited depth to perform surgery, the medical staff only needs to flip the cutting saw head 21 to the other side, which can solve the problem that the cutting saw head 21 occupies the operating space and causes the cutting operation to be difficult, thereby reducing the difficulty of operation for medical staff.

[0043] The side wall of the cutting saw head 21 is provided with a scale, and the positioning assembly 3 includes a track member 31, a movable plate 32 and a positioning member 33. The movable plate 32 is slidably arranged in the track member 31, and the movable plate 32 can also be self-locked in the stop position. A mounting groove 321 is provided at one end of the movable plate 32 facing the cutting saw head 21, and a part of the positioning member 33 is assembled in the mounting groove 321. When the track member 31 pushes the movable plate 32, the positioning member 33 moves together with the movable plate 32. When the medical staff uses the swinging sternum cutting saw with a limited depth to perform sternal surgery on the patient, During the cutting operation, the movable plate 32 drives the positioning member 33 to move, and according to the predetermined cutting depth, the positioning member 33 is moved to the corresponding scale on the cutting saw head 21. At this time, the positioning member 33 is located on the side of the cutting saw head 21. At the same time, since the movable member can be self-locked on the track member 31, when the medical staff performs the cutting operation, when the cutting reaches the predetermined depth, the medical staff will not continue cutting. When performing the operation, the cutting depth can be accurate, the operation level of the cutting operation is improved, the safety of the patient's operation is improved, and the occurrence of medical accidents is reduced.

[0044] Regarding the movable plate 32 being able to move along the track member 31 and self-lock at the stop position, for example, continuous saw teeth are provided on both sides of the track member 31, and a plurality of sets of clamping parts are correspondingly provided on the movable plate 32, and the clamping parts can be clamped in the intervals between the saw teeth, so that the movable plate 32 can self-lock at any position on the track member 31. Since the self-locking force between the clamping parts and the saw teeth is less than the thrust of the medical staff on the movable plate 32, the movable plate 32 can move along the track member 31. Regarding the adjustment of the self-locking force between the movable plate 32 and the track member 31, on the one hand, the number of clamping parts can be increased, and on the other hand, the intervals between the saw teeth can also be increased. As long as the use requirements can be met, there is no specific restriction on the design of the track member 31 and the movable plate 32.

[0045] In this embodiment, Figure 2 and Figure 3 As shown in , the swing cutting sternum saw with limited depth also includes a driving component 4, and the cutting component 2 includes a connecting member 22, wherein the connecting member 22 is connected between the output end of the driving component 4 and the cutting saw head 21. When the driving component 4 is running, it will drive the connecting member 22 to move, and then drive the cutting saw head 21 to swing through the connecting member 22, avoiding manual swinging of the cutting saw head 21, making it easier for medical staff to operate the swing cutting sternum saw with limited depth, and making the sternum cutting operation process faster. The cutting saw head 21 includes a cutting saw 211 and a fixing clamp 212, and the fixing clamp 212 is connected to the connecting member 22. The cutting saw 211 can be disassembled in the fixing clamp 212, so that the cutting saw 211 can be replaced and maintained at any time to ensure the sharpness of the cutting of the cutting saw 211. At the same time, the model of the cutting saw 211 can be replaced according to the actual surgical situation, so as to improve the use flexibility of the swing cutting sternum saw with limited depth, so as to be suitable for a variety of application scenarios.

[0046] In this embodiment, Figures 3 to 6 As shown in , the swing cutting sternum saw with limited depth also includes a reset assembly 5. The reset assembly 5 can stop the cutting saw 211 from swinging after the cutting saw head 21 reaches a predetermined cutting depth. Exemplarily, the reset member includes a first elastic member, a toggle member 51 and a connecting rope 52, wherein a protruding member 41 is provided in the driving assembly 4, a bending portion 511 is provided on the toggle member 51, and the inner wall of the bending portion 511 abuts against the protruding member 41. Controlling the movement of the toggle member 51 can control the movement of the protruding member 41, thereby changing the direction of the protruding end of the driving assembly 4, controlling the connection state between the driving assembly 4 and the connecting member 22, and thereby stopping the swinging of the cutting saw head 21.

[0047] Specifically, the first elastic member is fixed to the track member 31, the toggle member 51 is connected to the first elastic member, and the connecting rope 52 is connected between the positioning member 33 and the first elastic member. When the medical staff pushes the movable plate 32, the connecting rope 52 is pulled out, and the extension member 41 and the toggle member 51 are stable in force, and the extension direction of the driving assembly 4 will not change. The elastic force of the first elastic member is smaller than the self-locking force between the movable plate 32 and the track member 31, so as to ensure that the movable plate 32 can always be self-locked in the stop position. At the same time, the positioning member 33 can selectively move in the installation groove 321. When the positioning member 33 touches the sternum, the positioning member 33 will slide in the installation groove 321, the connecting rope 52 will be relaxed, and the first elastic member will shrink instantly. At this time, the toggle member 51 will toggle the protruding member 41 in the direction of the winding of the connecting rope 52. The force direction of the protruding member 41 changes rapidly, thereby changing the direction of the protruding end of the driving component 4, so that the protruding end of the driving component 4 is away from the connecting member 22. At this time, the driving component 4 cannot drive the connecting member 22 to move, thereby stopping the cutting saw 211 from swinging and stopping the cutting operation.

[0048] Furthermore, if Figure 1 As shown in the figure, the track member 31 includes a slide rail 311 and a base plate 312, the base plate 312 is laid on the slide rail 311, the first elastic member is fixed on the base plate 312, the base plate 312 has an installation area, the installation area is located outside the slide rail 311, and the remaining area is located inside the slide rail 311. The first elastic member can be fixedly installed in the installation area to improve the rationality of the structure of the reset component 5, make the structure of the positioning component 3 and the reset component 5 more compact, and the setting of the base plate 312 can avoid scratches on the slide rail 311, thereby increasing the service life of the positioning component 3.

[0049] For example, Figure 1As shown in the figure, the reset assembly 5 includes a knob 53, which is located on the installation area of ​​the bottom plate 312. The knob 53 includes a screw cover, and a rotating shaft is provided inside the knob 53. The screw cover is connected to the rotating shaft and can rotate together with the rotating shaft. The first elastic member is preferably a spiral spring, and the spiral spring is arranged around the rotating shaft. The arrangement of the knob 53 can improve the aesthetics of the reset assembly 5 and occupy a small space. A distance measuring instrument is provided on the screw cap. When the medical staff pushes the movable plate 32, the first elastic member is pulled, and the rotating shaft drives the screw cap to rotate. The distance measuring instrument can calculate the distance that the movable plate 32 drives the positioning member 33 to be pushed according to the amplitude and number of rotations of the screw cap. Because when the movable plate 32 is not pushed, the distance between the top of the positioning member 33 and the top of the cutting saw 211 is a fixed value. When the distance pushed by the positioning member 33 is obtained, the distance between the positioning member 33 and the top of the cutting saw 211 at this time can be calculated. The medical staff can compare the positioning member 33 with the scale on the cutting saw head 21. The distance measuring instrument is set to assist the medical staff in further calibrating the stop position of the positioning member 33 to ensure that the medical staff has a more accurate cutting depth when performing the cutting operation.

[0050] The positioning member 33 can selectively move in the mounting groove 321. For example, Figure 1 , Figure 5 and Figure 6 As shown in, the positioning member 33 includes a telescopic portion 331 and a main body portion 332, wherein the telescopic portion 331 is located on the side of the main body portion 332, and the mounting groove 321 includes a first placement groove and a first placement groove that are connected, the telescopic portion 331 is placed in the first placement groove, and the main body portion 332 is located in the second placement groove. When the positioning member 33 is correctly placed in the mounting groove 321, there is a gap between the positioning member 33 and the rear end surface of the mounting groove 321. Since the telescopic portion 331 is in the first placement groove at this time, the telescopic portion 331 and the side wall of the first mounting groove 321 abut against each other to overcome the elastic force of the first elastic member, ensuring that there is a gap between the positioning member 33 and the mounting groove 321, so that the positioning member 33 can selectively move in the mounting groove 321, wherein the telescopic portion The cross-sectional shape of 331 is a right triangle, and its hypotenuse faces the moving direction of the positioning member 33 in the installation groove 321. In this way, when the positioning member 33 touches the sternum, the positioning member 33 will be subjected to the force given by the sternum, and the hypotenuse will abut against the corner of the first placement groove. At this time, the telescopic part 331 gradually falls and moves into the main body 332, so that the positioning member 33 retreats in the installation groove 321. At this time, the connecting rope 52 is relaxed, the first elastic member is retracted, and the toggle member 51 quickly toggles the protruding member 41. The force on the protruding end of the driving component 4 is unbalanced, thereby changing its direction, so that the driving component 4 is disconnected from the connecting member 22, and the driving component 4 cannot drive the cutting saw head 21 to move, that is, the cutting saw 211 stops swinging and the cutting operation stops.

[0051] The direction of the extended end of the drive assembly 4 can be changed, for example, Figure 2 and Figure 3 As shown in , the driving assembly 4 includes a driving motor 42, a second elastic member 43 and a driving gear 44. The output end of the driving motor 42 is provided with a connecting column 421, and the connecting column 421 is made of a flexible material. The second elastic member 43 is sleeved on the connecting column 421, and the second elastic member 43 is connected to the driving gear 44. The driving gear 44 is arranged on the connecting column 421, and the extension member 41 is arranged on both sides of the driving gear 44. In this way, when the toggle member 51 toggles the extension member 41, the connecting column 421 and the second elastic member 43 are deformed to change the direction of the driving gear 44, so that the driving gear 44 is separated from the connecting member 22, and the cutting saw head 21 stops swinging. A through hole 11 is provided at the opposite side of the housing 1 and the extension end, and the extension member 41 extends out of the through hole 11 so that the inner wall of the toggle member 51 abuts against the extension member 41.

[0052] Specifically, Figure 2 and Figure 4 As shown in the figure, the cutting assembly 2 includes a fixed surface shell 23, part of which is placed in the shell 1, wherein the connecting member 22 is located inside the fixed surface shell 23 and can rotate together with the fixed surface shell 23, and the cutting saw head 21 is located on the side of the fixed surface shell 23. The cutting saw head 21 can be rotated by rotating the fixed surface shell 23, thereby improving the flexibility of using the swing cutting sternum saw with a limited depth, facilitating the medical staff to perform cutting operations, and further reducing the surgical risks of patients. The connecting member 22 includes a connecting gear 221, a connecting rod 222, a cam 223 and a connecting plate 224. The connecting plate 224 is arranged inside the fixed surface shell 23. The connecting gear 221 is arranged on the connecting column 421, and the connecting gear 221 and the driving gear 44 are meshed with each other. The connecting rod 222 is connected between the connecting gear 221 and the cam 223. When the connecting gear 221 is meshed with the driving gear 44, the driving motor 42 runs, the driving gear 44 rotates, and then drives the connecting gear 221 to rotate, the connecting rod 222 moves and drives the cam 223 to swing, wherein the cutting saw head 21 is connected to the cam 223, thereby driving the cutting saw head 21 to swing.

[0053] After the cutting assembly 2 has completed its rotation in the housing 1, in order to ensure that it can be stably assembled in the housing 1, for example, Figure 1 and Figure 4As shown in , a lock button 231 is provided on the fixed face shell 23, and the lock button 231 has a latch. A mounting hole opposite to the lock button 231 is provided on the housing 1, and the latch can be selectively inserted into the mounting hole. Specifically, the lock button 231 has a pressing piece. When the pressing piece is pressed for the first time, the latch will be inserted into the mounting hole. At this time, the fixed face shell 23 is locked with the housing 1, and the swing cutting sternum saw with limited depth has a stable structure, which enables medical staff to perform surgical operations. When the pressing piece is pressed again, the latch will retract from the mounting hole. At this time, the cutting assembly 2 can rotate relative to the housing 1 to adjust the position of the cutting saw head 21. The structure of the lock button 231 belongs to conventional technical means in locking parts and does not belong to the key protection scope of the present utility model.

[0054] Preferably, the swing-cutting sternum saw with a limited depth includes a rubber sleeve, which is mounted on the shell 1. This can prevent medical staff from slipping when taking the swing-cutting sternum saw with a limited depth, thereby improving the convenience of taking it. On the other hand, it is also possible to wrap a rubber gasket on the handheld portion 13 of the shell 1, or to wrap a rubber tape around it, so as to prevent the swing-cutting sternum saw with a limited depth from falling off.

[0055] In summary, the working principle of the swing-cutting sternum saw with a limited depth is as follows: when in use, the medical staff pulls the movable plate 32 toward the cutting saw head 21 according to the depth of bone cutting required, until the positioning member 33 is pulled to the predetermined scale position on the cutting saw head 21, and as the positioning member 33 moves, the connecting rope 52 is pulled out, the first elastic member is in a stretched state, the toggle member 51 is always in contact with the protruding member 41, and during the pushing process of the movable plate 32, the protruding member 41 is always in a force balance state, and the driving gear 44 is meshed with the connecting gear 221. Then the medical staff starts the driving assembly 4, at which time the driving motor 42 drives the driving gear 44 to rotate, and the driving gear 44 drives the connecting gear 221 to move, at which time the connecting rod 222 moves and drives the cam 223 to swing, and the driving cutting saw head 21 will swing cyclically with the cam 223, thereby realizing the use of the swing-cutting sternum saw with a limited depth to cut the sternum. When the cutting saw 211 cuts to the specified depth, the positioning member 33 will first come into contact with the sternum at the cutting location. The positioning member 33 is subjected to the force, and the telescopic portion 331 on the positioning member 33 will gradually retract along its inclined surface into the main body 332, and the positioning member 33 will move backward in the mounting groove 321, causing the connecting rope 52 to suddenly relax, and the first elastic member to retract quickly. At this time, the toggle member 51 instantly toggles the protruding member 41, and the force on the protruding end of the driving component 4 changes, and the driving gear 44 and the connecting gear 221 cannot maintain a force balance state. At this time, the driving gear 44 and the connecting gear 221 are in a separated state, and the driving component 4 cannot drive the cutting saw head 21 to swing, and the cutting operation is ended.

[0056] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A sternum saw with a limited depth, characterized in that: include: A housing (1) and a cutting assembly (2), wherein the cutting assembly (2) is partially inserted into the housing (1), and the cutting assembly (2) can selectively rotate relative to the housing (1); The cutting assembly (2) comprises a cutting saw head (21), and a side wall of the cutting saw head (21) is provided with scales; A positioning assembly (3) comprises a track member (31), a movable plate (32) and a positioning member (33); the movable plate (32) is slidably arranged in the track member (31), and the movable plate (32) can be self-locked in a stop position; an installation groove (321) is provided at one end of the movable plate (32) facing the cutting saw head (21); a portion of the positioning member (33) is located in the installation groove (321), and the positioning member (33) can move together with the movable plate (32).

2. The oscillating cutting sternum saw with a limitable depth according to claim 1, characterized in that: The swing-cutting sternum saw with a limited depth further comprises a driving assembly (4), and the cutting assembly (2) further comprises a connecting member (22), wherein the connecting member (22) is connected between the driving assembly (4) and the cutting saw head (21), and when the driving assembly (4) is in operation, the connecting member (22) drives the cutting saw head (21) to swing.

3. The oscillating cutting sternum saw with a limitable depth according to claim 2, characterized in that: The cutting saw head (21) comprises a cutting saw (211) and a fixing clamp (212); the cutting saw (211) is detachable from the fixing clamp (212); and the fixing clamp (212) is connected to the connecting member (22).

4. The oscillating cutting sternum saw with a limitable depth according to claim 2, characterized in that: The swing-cutting sternum saw capable of limiting the depth further comprises a reset assembly (5), the reset assembly (5) comprising a first elastic member, a toggle member (51) and a connecting rope (52); the driving assembly (4) comprises a protruding member (41); the toggle member (51) comprises a bent portion (511); the inner wall of the bent portion (511) abuts against the protruding member (41); the first elastic member is fixed to the track member (31); the toggle member (51) is connected to the first elastic member; the connecting rope (52) is connected between the positioning member (33) and the first elastic member; the movable plate (32) can always be self-locked in the stop position; when the positioning member (33) touches the sternum, the positioning member (33) can move in the mounting groove (321); the toggle member (51) toggle the protruding member (41); and the protruding end of the driving assembly (4) is away from the connecting member (22).

5. The oscillating cutting sternum saw with a limitable depth according to claim 4, characterized in that: The track member (31) comprises a slide rail (311) and a bottom plate (312), wherein the bottom plate (312) is laid inside the slide rail (311), and the first elastic member is fixed on the bottom plate (312); And / or, the reset assembly (5) further comprises a rotating knob (53), the rotating knob (53) being located on the bottom plate (312), the rotating knob (53) comprising a screw cover, a rotating shaft being provided inside the rotating knob (53), the screw cover being connected to the rotating shaft, the first elastic member being a volute spring, the volute spring being arranged around the rotating shaft, and when the first elastic member is pulled, the screw cover rotates, and a distance measuring instrument is arranged on the screw cover.

6. The oscillating cutting sternum saw with a limitable depth according to claim 4, characterized in that: The positioning member (33) comprises a telescopic portion (331) and a main body (332); the telescopic portion (331) is located on the side of the main body (332); the telescopic portion (331) can be selectively placed in the main body (332); when the positioning member (33) touches the sternum, the telescopic portion (331) is located in the main body (332); and the main body (332) can move in the mounting groove (321).

7. The oscillating cutting sternum saw with a limitable depth according to claim 4, characterized in that: The driving assembly (4) comprises a driving motor (42), a second elastic member (43) and a driving gear (44); the output end of the driving motor (42) has a connecting column (421); the connecting column (421) is made of a flexible material; the second elastic member (43) is sleeved on the connecting column (421); the second elastic member (43) is connected to the driving gear (44); the protruding member (41) is located on both sides of the driving gear (44); a through hole (11) is provided at a position of the housing (1) opposite to the protruding member (41); and the protruding member (41) is arranged to protrude from the through hole (11).

8. The oscillating cutting sternum saw with a limitable depth according to claim 7, characterized in that: The cutting assembly (2) comprises a fixed surface shell (23), wherein the fixed surface shell (23) is partially disposed in the housing (1), the connecting member (22) is disposed inside the fixed surface shell (23), and the connecting member (22) can rotate together with the fixed surface shell (23), the cutting saw head (21) is disposed on the side of the fixed surface shell (23), the connecting member (22) comprises a connecting gear (221), a connecting rod (222), a cam (223) and a connecting plate (224), the connecting plate (224) is disposed in the fixed surface shell (23), the connecting gear (221) is disposed on the connecting plate (224), the connecting gear (221) and the driving gear (44) are meshed with each other, the cutting saw head (21) is connected to the cam (223), and the connecting rod (222) is connected between the connecting gear (221) and the cam (223).

9. The oscillating cutting sternum saw with a limitable depth according to claim 8, characterized in that: The fixed surface shell (23) is provided with a lock button (231), and the lock button (231) has a latch. The shell (1) is provided with a mounting hole corresponding to the lock button (231), and the latch can be selectively inserted into the mounting hole. The lock button (231) has a pressing piece. When the pressing piece is pressed for the first time, the latch is inserted into the mounting hole, and the cutting assembly (2) is fixed to the shell (1). When the pressing piece is pressed again, the latch retracts, and the cutting assembly (2) can rotate relative to the shell (1).

10. The oscillating cutting sternum saw with a limitable depth according to any one of claims 1 to 9, characterized in that: The swing-cutting sternum saw capable of limiting the depth comprises a rubber sleeve, wherein the rubber sleeve is sleeved outside the housing (1).

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