Electric medical orthopedic swing saw and control method thereof

Abstract

The invention relates to the technical field of medical instruments, and discloses an electric medical orthopedic swing saw and a control method thereof.The electric medical orthopedic swing saw comprises a main body assembly and a working assembly, the main body assembly comprises a motor bin and a grab handle connected to the motor bin, a vibration sensing module is installed on the motor bin, and a vibration motor is installed at one end of the motor bin; the working assembly comprises a mounting shell and a swing part arranged in the mounting shell, a mounting seat is arranged in the mounting shell, one end of the mounting shell is connected with a first transmission part, and the swing part is connected with a second transmission part; the problems that in the prior art, when a swing saw works, high-frequency mechanical vibration is conducted to the hand of an operator through a handle, occupational injuries such as carpal tunnel syndrome can be caused by long-time operation, and the stability of a cutting track can be reduced due to transverse deviation of a saw blade caused by vibration are solved; and meanwhile, uncontrollable instantaneous torque fluctuation can be generated in the swinging process of the swinging saw, so that the problem that an instrument slips or a cutting angle deviates easily is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to an electric medical orthopedic oscillating saw and a control method thereof. Background Art

[0002] In complex surgical procedures such as fracture fixation, joint replacement, and spinal correction, the accuracy of bone cutting operations is directly related to the success rate of the operation and the quality of the patient's postoperative recovery. Traditional bone cutting tools such as osteotome and wire saws are gradually being replaced by power tools due to problems such as low operating efficiency and rough cutting surfaces. Among them, the orthopedic oscillating saw has become an indispensable and efficient instrument in orthopedic surgery with its unique swinging cutting mechanism. The oscillating saw drives the saw blade in the metal chuck to swing left and right at high frequency through the drive system, and uses the reciprocating motion of the saw teeth to achieve bone tissue cutting. Compared with rotary bone drills, the cutting trajectory of the oscillating saw is more controllable, can form a flat bone section, and has better spatial adaptability in deep surgical fields. Therefore, it is widely used in surgical procedures that require millimeter-level precision, such as acetabuloplasty and laminectomy.

[0003] The mechanical structure of existing orthopedic oscillating saws usually consists of a power module, a transmission mechanism, a handle assembly, and a replaceable saw blade. During operation, the surgeon needs to maintain the stability of the instrument with a specific grip posture and achieve precise cutting by adjusting the vertical angle between the saw blade and the bone surface. International orthopedic instrument standards have established clear specifications for performance parameters such as the cutting efficiency and saw blade rigidity of oscillating saws, but in actual clinical applications, the device still has significant functional limitations. Especially when faced with high-density bone tissue or complex anatomical parts, the defects of existing oscillating saws in terms of dynamic characteristics and ergonomic design are further magnified, directly affecting the surgical safety margin and operational tolerance.

[0004] The existing oscillating saw generates broadband vibrations in the working state, with the main frequency band concentrated in 200-800Hz, which has multiple negative effects: on the one hand, the high-frequency mechanical vibration is transmitted to the operator's hand through the handle, causing muscle fatigue acceleration values ​​generally exceeding 8m / s 2 The safety threshold is exceeded, and prolonged operation can cause occupational injuries such as carpal tunnel syndrome. Furthermore, vibration-induced lateral deviation of the saw blade can reduce cutting path stability. Experimental data shows that when the amplitude exceeds 50μm, the cutting path deviation can reach 0.3-0.5mm, posing a direct threat to procedures requiring submillimeter precision, such as scoliosis correction. Furthermore, the sound pressure level generated by the friction between vibration energy and bone tissue can reach 85-95dB, disrupting communication within the surgical team and potentially causing hearing damage to the patient.

[0005] The dynamic torque generated during the swinging motion of an oscillating saw creates a significant counteracting force. When the saw blade cuts into bone tissue, the shifting bone density gradient triggers asymmetric loading. This creates a dynamic coupling effect between the constant driving force output by the power system and the bone resistance, generating uncontrollable instantaneous torque fluctuations that can easily lead to instrument slippage or cutting angle deviation. In restricted surgical fields, such as anterior spinal surgery, this instability can cause serious complications such as dural sac tears or vertebral artery injury. Summary of the Invention

[0006] In order to solve the problems in the above-mentioned prior art that high-frequency mechanical vibration is transmitted to the operator's hand through the handle when the oscillating saw is working, long-term operation may cause occupational injuries such as carpal tunnel syndrome, and the lateral deviation of the saw blade caused by the vibration will reduce the stability of the cutting trajectory; at the same time, uncontrollable instantaneous torque fluctuations will be generated during the swinging process of the oscillating saw, which can easily cause the instrument to slip or the cutting angle to deviate, the present invention provides an electric medical orthopedic oscillating saw and its control method, and the present invention is achieved through the following technical solutions.

[0007] An electric medical orthopedic oscillating saw comprises a main assembly and a working assembly. The main assembly comprises a motor compartment and a handle connected to the motor compartment, a vibration sensor module is mounted on the motor compartment, and a vibration motor is mounted at one end of the motor compartment.

[0008] The working component includes a mounting shell and a swinging member arranged inside the mounting shell, and a mounting seat is arranged inside the mounting shell. One end of the mounting shell is connected to a first transmission member, and the first transmission member is connected to a saw blade. The swinging member is connected to a second transmission member, and the second transmission member is connected to a counterweight block.

[0009] As a preferred solution of the electric medical orthopedic oscillating saw of the present invention, the oscillating member includes a transmission structure and a first toggle structure connected to the transmission structure, and a second toggle structure is provided on one side of the first toggle structure.

[0010] As a preferred solution of the electric medical orthopedic oscillating saw of the present invention, the transmission structure includes a transmission shaft and a first eccentric wheel fixedly connected to the transmission shaft, and a second eccentric wheel is provided on one side of the first eccentric wheel.

[0011] As a preferred embodiment of the electric medical orthopedic oscillating saw of the present invention, the first eccentric wheel and the second eccentric wheel have the same shape and size, and both are eccentrically connected to the transmission shaft, and the first eccentric wheel and the second eccentric wheel are deflected 180° relative to each other.

[0012] As a preferred solution of the electric medical orthopedic oscillating saw of the present invention, the first shifting structure includes a U-shaped shifting rod and a matching seat fixedly connected to the U-shaped shifting rod, and a matching groove is formed on the matching seat.

[0013] As a preferred embodiment of the electric medical orthopedic oscillating saw of the present invention, the first toggle structure and the second toggle structure have the same internal structure, and the first toggle structure is connected to the first eccentric wheel, and the second toggle structure is connected to the second eccentric wheel.

[0014] As a preferred solution of the electric medical orthopedic oscillating saw described in the present invention, the first transmission member includes a fixed seat and a fixed groove opened inside the fixed seat, and one end of the fixed seat is fixedly connected to a rotating shaft, a fixed block is connected to the fixed seat, and a fixed rack is provided on the fixed block, and a fixing bolt is provided on the fixed block.

[0015] As a preferred solution of the electric medical orthopedic oscillating saw of the present invention, the internal structure of the first transmission member is the same as the internal structure of the second transmission member, and the first transmission member and the second transmission member are both rotatably mounted on the mounting seat.

[0016] A control method for an electric medical orthopedic oscillating saw according to any one of claims 1 to 9, comprising the following steps:

[0017] Step 1: The oscillating saw generates invalid vibrations during operation. The vibration sensor on the upper end of the oscillating saw body converts the vibrations into vibration signals and inputs the signals into the control circuit.

[0018] Step 2: The input circuit analyzes the amplitude, direction, and phase of the imported vibration signal and outputs an anti-phase vibration signal to the vibration motor drive circuit;

[0019] Step 3: The driving circuit drives the linear motor, and the motor generates active vibration with an amplitude and orientation close to the source vibration but opposite phase to offset the ineffective vibration generated by the oscillating saw itself;

[0020] Step 4: The vibration sensor on the upper end of the oscillating saw body detects the vibration of the body after active vibration reduction in real time again, converts the vibration into a vibration signal, and enters the next active vibration reduction cycle.

[0021] The present invention has the following beneficial effects:

[0022] The oscillating saw of this invention features an active vibration cancellation system that offsets ineffective vibrations generated by the device itself. Furthermore, a torque self-cancelling mechanism suppresses the unpleasant vibrations felt by the operator's hand caused by the saw blade's swinging torque, making the saw more precise, comfortable, and easier to operate. This torque self-cancellation reduces the risk of torque damage, especially when the saw is stuck.

[0023] 2. The counterweight of this invention is replaceable to accommodate blades of different specifications, ensuring low swing for precise partial cutting. The counterweight can also be directly removed to provide maximum power for full-power cutting.

[0024] 3. The saw blade counterweight device of the present invention is detachable and can be interchanged with the saw blade to achieve high and low position installation of the saw blade for use in different surgical scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for use in the description of the specific implementation methods. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 : Schematic diagram of the overall structure of the present invention;

[0027] Figure 2 : A schematic cross-sectional view of the working assembly of the present invention;

[0028] Figure 3 : Schematic diagram of the connection structure between the swing member, the first transmission member and the second transmission member in the present invention;

[0029] Figure 4 : Schematic diagram of the explosion structure of the swing member in the present invention;

[0030] Figure 5 : The present invention Figure 3 Schematic diagram of the enlarged structure at A in the middle;

[0031] Figure 6 : Schematic diagram of vibration feedback signal control principle of the present invention.

[0032] The reference numerals are as follows:

[0033] 10. Main assembly; 11. Motor compartment; 12. Handle; 13. Vibration sensor module; 14. Vibration motor; 20. Working assembly; 21. Mounting shell; 22. Swinging member; 221. Transmission structure; 2211. Transmission shaft; 2212. First eccentric wheel; 2213. Second eccentric wheel; 222. First toggle structure; 2221. U-shaped toggle lever; 2222. Matching seat; 2223. Matching groove; 223. Second toggle structure; 23. Mounting seat; 24. First transmission member; 241. Fixed seat; 242. Fixed groove; 243. Rotating shaft; 244. Fixed block; 245. Fixed rack; 246. Fixing bolt; 25. Saw blade; 26. Second transmission member; 27. Counterweight. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0035] Example 1

[0036] Reference Figures 1 to 5 As shown in the first embodiment of the present invention, an electric medical orthopedic oscillating saw is provided, including a main body component 10 and a working component 20. The main body component 10 includes a motor compartment 11 and a handle 12 connected to the motor compartment 11, and a vibration sensor module 13 is installed on the motor compartment 11, and a vibration motor 14 is installed at one end of the motor compartment 11; a driving motor is arranged inside the motor compartment 11, and a battery compartment is arranged inside the handle 12, and the battery compartment is fully wrapped. At the same time, the entire oscillating saw can be sterilized with high-temperature and high-pressure steam. At this time, the rechargeable battery should be removed, and the battery compartment cover should be ensured to be closed and locked.

[0037] The working assembly 20 includes a mounting housing 21 and a swinging member 22 disposed within the mounting housing 21. A mounting seat 23 is disposed within the mounting housing 21. A first transmission member 24 is connected to one end of the mounting housing 21, and a saw blade 25 is connected to the first transmission member 24. A second transmission member 26 is connected to the swinging member 22, and a counterweight 27 is connected to the second transmission member 26.

[0038] Among them, the mounting shell 21 is fixedly connected to one side of the motor compartment 11, the swing member 22 is arranged inside the mounting shell 21, and one end of the swing member 22 is connected to the driving motor inside the motor compartment 11, the mounting seat 23 is fixedly connected to the inside of the mounting shell 21, and the first transmission member 24 and the second transmission member 26 are both rotatably mounted on the mounting seat 23.

[0039] The swing member 22 includes a transmission structure 221 and a first toggle structure 222 connected to the transmission structure 221, with a second toggle structure 223 provided on one side of the first toggle structure 222. The transmission structure 221 includes a transmission shaft 2211 and a first eccentric wheel 2212 fixedly connected to the transmission shaft 2211, with a second eccentric wheel 2213 provided on one side of the first eccentric wheel 2212. The first toggle structure 222 includes a U-shaped lever 2221 and a mating seat 2222 fixedly connected to the U-shaped lever 2221, with a mating groove 2223 defined in the mating seat 2222.

[0040] Among them, the first eccentric wheel 2212 and the second eccentric wheel 2213 have the same shape and size, and both are eccentrically connected to the transmission shaft 2211. At the same time, the first eccentric wheel 2212 and the second eccentric wheel 2213 are deflected 180° relative to each other; the internal structure of the first toggle structure 222 and the second toggle structure 223 are the same, the first eccentric wheel 2212 moves inside the first toggle structure 222, and the second eccentric wheel 2213 moves in coordination inside the second toggle structure 223. When the transmission shaft 2211 drives the first eccentric wheel 2212 and the second eccentric wheel 2213 to rotate, the eccentric setting of the first eccentric wheel 2212 and the second eccentric wheel 2213 causes the first toggle structure 222 and the second toggle structure 223 to perform reciprocating motion in opposite directions.

[0041] The first transmission member 24 includes a fixing base 241 and a fixing slot 242 defined within the fixing base 241 . A rotating shaft 243 is fixedly connected to one end of the fixing base 241 . A fixing block 244 is connected to the fixing base 241 . The fixing block 244 is provided with a fixing rack 245 . The fixing block 244 is provided with a fixing bolt 246 .

[0042] Among them, the internal structure of the first transmission member 24 is the same as the internal structure of the second transmission member 26, and the first transmission member 24 and the second transmission member 26 are both rotatably mounted on the mounting seat 23; the fixing groove 242 and the fixed rack 245 are connected by a snap-fitting manner, and then the fixing block 244 is fixedly connected to the fixing seat 241 by using a threaded connection between the fixing bolt 246 and the fixing seat 241. Since the saw blade 25 is fixedly connected to the fixing seat 241, the saw blade 25 can reciprocate back and forth with the fixing seat 241.

[0043] During use, by installing and fixing the fixing block 244 with the fixing bolt 246, the position of the saw blade 25 and the counterweight 27 can be changed at will to meet the requirements of high-position and low-position cutting. In addition, the counterweight 27 can also be removed. At this time, the oscillating saw is in full-power cutting state and is used in application scenarios where the oscillating saw does not need to be controlled;

[0044] The transmission structure 221 is driven by a driving motor to move, and the first transmission member 24 and the second transmission member 26 are made to swing in opposite directions through the coordinated transmission between the transmission structure 221 and the first toggle structure 222 and the second toggle structure 223. The swinging of the saw blade 25 and the counterweight block 27 in opposite phases can achieve the effect of self-offsetting of the swing torque.

[0045] Example 2

[0046] Reference Figure 6 FIG. 1 is a second embodiment of the present invention, a method for controlling an electric medical orthopedic oscillating saw, comprising the following steps:

[0047] Step 1: The oscillating saw generates invalid vibrations during operation. The vibration sensor on the upper end of the oscillating saw body converts the vibrations into vibration signals and inputs the signals into the control circuit.

[0048] Step 2: The input circuit analyzes the amplitude, direction, and phase of the imported vibration signal and outputs an anti-phase vibration signal to the vibration motor drive circuit;

[0049] Step 3: The driving circuit drives the linear motor, and the motor generates active vibration with an amplitude and orientation close to the source vibration but opposite phase to offset the ineffective vibration generated by the oscillating saw itself;

[0050] Step 4: The vibration sensor on the upper end of the oscillating saw body detects the vibration of the body after active vibration reduction in real time again, converts the vibration into a vibration signal, and enters the next active vibration reduction cycle.

[0051] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An electric medical orthopedic oscillating saw, comprising a main assembly (10) and a working assembly (20), characterized in that: The main body assembly (10) comprises a motor compartment (11) and a handle (12) connected to the motor compartment (11), a vibration sensor module (13) is installed on the motor compartment (11), and a vibration motor (14) is installed at one end of the motor compartment (11); The working assembly (20) includes a mounting shell (21) and a swinging member (22) arranged inside the mounting shell (21), and a mounting seat (23) is arranged inside the mounting shell (21). One end of the mounting shell (21) is connected to a first transmission member (24), and the first transmission member (24) is connected to a saw blade (25). The swinging member (22) is connected to a second transmission member (26), and the second transmission member (26) is connected to a counterweight (27).

2. The electric medical orthopedic oscillating saw according to claim 1, characterized in that: The swinging member (22) comprises a transmission structure (221) and a first toggle structure (222) connected to the transmission structure (221), and a second toggle structure (223) is provided on one side of the first toggle structure (222).

3. The electric medical orthopedic oscillating saw according to claim 2, characterized in that: The transmission structure (221) comprises a transmission shaft (2211) and a first eccentric wheel (2212) fixedly connected to the transmission shaft (2211), and a second eccentric wheel (2213) is provided on one side of the first eccentric wheel (2212).

4. The electric medical orthopedic oscillating saw according to claim 3, characterized in that: The first eccentric wheel (2212) and the second eccentric wheel (2213) have the same shape and size, and are both eccentrically connected to the transmission shaft (2211). At the same time, the first eccentric wheel (2212) and the second eccentric wheel (2213) are deflected 180 degrees relative to each other.

5. The electric medical orthopedic oscillating saw according to claim 4, characterized in that: The first shifting structure (222) comprises a U-shaped shifting rod (2221) and a matching seat (2222) fixedly connected to the U-shaped shifting rod (2221), and a matching groove (2223) is provided on the matching seat (2222).

6. The electric medical orthopedic oscillating saw according to claim 5, characterized in that: The first toggle structure (222) and the second toggle structure (223) have the same internal structure, and the first toggle structure (222) is connected to the first eccentric wheel (2212), and the second toggle structure (223) is connected to the second eccentric wheel (2213).

7. The electric medical orthopedic oscillating saw according to claim 6, characterized in that: The first transmission member (24) includes a fixing seat (241) and a fixing groove (242) provided inside the fixing seat (241), and one end of the fixing seat (241) is fixedly connected to a rotating shaft (243), a fixing block (244) is connected to the fixing seat (241), and a fixing rack (245) is provided on the fixing block (244), and a fixing bolt (246) is provided on the fixing block (244).

8. The electric medical orthopedic oscillating saw according to claim 7, characterized in that: The internal structure of the first transmission member (24) is the same as the internal structure of the second transmission member (26), and both the first transmission member (24) and the second transmission member (26) are rotatably mounted on the mounting seat (23).

9. A control method for an electric medical orthopedic oscillating saw according to any one of claims 1 to 8, characterized in that: The following steps are included: Step 1: The oscillating saw generates invalid vibrations during operation. The vibration sensor on the upper end of the oscillating saw body converts the vibrations into vibration signals and inputs the signals into the control circuit. Step 2: The input circuit analyzes the amplitude, direction, and phase of the imported vibration signal and outputs an anti-phase vibration signal to the vibration motor drive circuit; Step 3: The driving circuit drives the linear motor, and the motor generates active vibration with an amplitude and orientation close to the source vibration but opposite phase to offset the ineffective vibration generated by the oscillating saw itself; Step 4: The vibration sensor on the upper end of the oscillating saw body detects the vibration of the body after active vibration reduction in real time again, converts the vibration into a vibration signal, and enters the next active vibration reduction cycle.

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