CN113069173A

CN113069173A - Small bone saw for joint operation

Info

Publication number: CN113069173A
Application number: CN202110370794.0A
Authority: CN
Inventors: 黄菲菲
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-04-07
Filing date: 2021-04-07
Publication date: 2021-07-06

Abstract

The invention discloses a small bone saw for joint surgery, belonging to the field of joint surgery devices, and comprising a hand-held arm, wherein a power box is fixedly connected on the hand-held arm, a long arm rod is inserted on the power box, an electric push rod matched with the long arm rod is fixedly connected in the power box, one end of the long arm rod, which is far away from the power box, is fixedly connected with a movable joint, the movable joint is connected with a movable rod, one end of the movable rod, which is far away from the movable joint, is fixedly connected with a working end platform, the working end platform comprises a shell, a mounting hole is formed in the shell, a hollow rotating shaft is rotatably connected in the mounting hole, a round sawtooth blade is fixedly connected on the hollow rotating shaft, an induced draft fan is arranged in the rotating column, and a corrugated air duct is connected between the induced draft fan and the hollow rotating shaft, so that polishing and cutting work can be carried out according to needs in, the working end is ensured to be stable in working through locking the fixed movable rod and the corrugated air duct.

Description

Small bone saw for joint operation

Technical Field

The invention relates to the field of joint surgery devices, in particular to a small bone saw for joint surgery.

Background

Orthopedics is one of the most common departments in all hospitals, and mainly studies the anatomy, physiology and pathology of the skeletal muscle system, and maintains and develops the normal form and function of the system by using medicines, operations and physical methods. With the change of times and society, the orthopedic injury spectrum has obvious changes, for example, diseases such as osteoarticular tuberculosis, osteomyelitis, poliomyelitis and the like are obviously reduced, and the injuries caused by traffic accidents are obviously increased.

Most of orthopedic surgeries require operations such as cutting and the like on all parts of bones, however, the existing bone saws generally have driving devices which are not greatly different from the traditional saws in the outside; the wound surface is large when cutting is carried out, and the cut bone foam can cause great sequelae if the bone foam is not cleaned up.

The bone saw in the prior joint surgery is mostly operated dynamically, the efficiency of the bone saw is low, and the bone saw can cause side injury due to the technical level of an operator, thereby influencing the cure rate and prolonging the recovery period after the operation; the bone saw is easy to be limited by a large using space, and when a plurality of people perform an operation, the bone saw is easy to be stuck when being used due to insufficient using space, so that the operation efficiency is influenced, the recovery of a wound is influenced, the pain of a patient is increased, and the treatment cost is increased.

Disclosure of Invention

1. Technical problem to be solved

Aiming at the problems in the prior art, the invention aims to provide a small bone saw for joint surgery, which can realize the polishing and cutting work according to the needs in the surgery process, the working end can be freely adjusted, the small bone saw is easily adapted to various different using environments, and the working end is ensured to be stable in working through locking and fixing a movable rod and a corrugated air duct.

2. Technical scheme

In order to solve the above problems, the present invention adopts the following technical solutions.

A small bone saw for joint surgery comprises a hand-held arm, wherein a power box is fixedly connected to the hand-held arm, a long arm rod is inserted into the power box, an electric push rod matched with the long arm rod is fixedly connected in the power box, a movable joint is fixedly connected to one end, away from the power box, of the long arm rod, the movable joint comprises a rotary column, two ends of the rotary column are respectively connected with a fixed column and a connecting column, the fixed column and the long arm rod are connected in a clamping manner, a stepping motor is installed in the fixed column, a power output end of the stepping motor is fixedly connected with the rotary column, a movable rod is rotatably connected to the connecting column, a working end table is fixedly connected to one end, away from the movable joint, of the movable rod, the working end table comprises a shell, a mounting hole is formed in the shell, a hollow rotating shaft is rotatably connected in the mounting hole, and a circular serrated blade is fixedly connected to the, fixedly connected with servo motor in the casing, be connected with the driving chain between servo motor's power take off end and the hollow rotating shaft, install the draught fan in the column spinner, be connected with the ripple air duct between draught fan and the hollow rotating shaft, the upper and lower both ends of casing all are connected with the piece of polishing, one of them it has a plurality of teeth of polishing to open the chisel on the piece of polishing, can realize polishing and cutting work as required at the operation in-process, but the work end free adjustment adapts to the service environment of multiple difference easily, through locking fixed movable rod and ripple air duct, guarantees the stability of work end during operation.

Further, ripple air duct is including interior ripple pipe, outer ripple pipe has been cup jointed in the outside of interior ripple pipe, it has the electrorheological fluids to fill between interior ripple pipe and the outer ripple pipe, all be connected with the sealing ring between the both ends of interior ripple pipe and outer ripple pipe, be connected with a plurality of elastic lead between two sealing rings, and elastic lead is located between interior ripple pipe and the outer ripple pipe, leads to the electrorheological fluids sclerosis of ripple air duct after the circular telegram through elastic lead, makes the space between interior ripple pipe and the outer ripple pipe filled by the electrorheological fluids of sclerosis, makes the ripple air duct be in the state of can not stretch bending to this lock that realizes the ripple air duct dies.

Furthermore, smooth discs are sleeved at two ends of the hollow rotating shaft, a one-way air valve is connected between each smooth disc and the hollow rotating shaft, a plurality of air outlets which are uniformly distributed and matched with the one-way air valves are formed in each smooth disc, so that air flow in the hollow rotating shaft can be discharged through the air outlets, and the discharged air flow impacts the rotating circular sawtooth blade.

Further, the one end that the movable rod is close to the spliced pole is the ball-type, be equipped with in the spliced pole a pair of and movable rod assorted damping fin, a pair of electro-magnet ring that matches with the damping fin of fixedly connected with on the inner wall of spliced pole, the one end fixedly connected with permanent magnet that the damping fin is close to the electromagnetism iron ring, be connected with a plurality of elastic fiber lines between damping fin and the electro-magnet ring, make the electromagnetism iron ring under the on-state, produce the repulsion between electromagnetism iron ring and the damping fin, and then make the damping fin extrude the circular end of movable rod, realize locking to the movable rod, and the elastic fiber line is used for binding up under the not on-state of electromagnetism iron ring, and the damping fin makes the damping fin not contact with the spherical end of movable rod.

Further, fixedly connected with filter screen on the air inlet of air draught fan in the column spinner, the joint has the sponge piece on the filter screen, the sponge piece adsorbs has disinfectant fluid, makes the air current that the air draught fan introduced can be disinfected.

Furthermore, one end of the power box, which is far away from the handheld arm, is fixedly connected with a rigid support ring matched with the long arm rod, and the long arm rod is connected with the rigid support ring in a sliding manner.

Furthermore, sealing bearings are connected between the upper end and the lower end of the hollow rotating shaft and the shell.

Further, install in the headstock with electric putter assorted power supply, install the controller in the column spinner, electromagnetism iron ring and elastic wire all with controller electric connection, be connected with power interface and plug that mutually match on fixed column and the long armed lever respectively, plug and power supply electric connection make electromagnetism iron ring and elastic wire circular telegram simultaneously, make things convenient for device's centralized control.

Furthermore, an auxiliary handheld sleeve is sleeved on the corrugated air duct, and the inner diameter of the auxiliary handheld sleeve is larger than the maximum outer diameter of the corrugated air duct.

A small bone saw for joint surgery comprises the following using methods:

s1, before use, technicians control the fixed columns to work according to work requirements, and select a working end table to polish or cut;

s2, controlling the fixed column to drive the rotating column to rotate by 90 degrees, enabling the circular serrated blade to be in a vertical state, cutting by using the circular serrated blade, enabling the circular serrated blade to be in a horizontal state when the fixed column does not work, and polishing by using a polishing sheet;

s3, a technician can adjust the movable rod according to the working environment to enable the position of the circular sawtooth blade to adapt to the operating environment, after the inclination angle of the movable rod is determined, the electromagnet ring is electrified to enable the damping sheet to lock the movable rod under the action of repulsion force, so that the spherical end of the movable rod is fixed, meanwhile, the elastic lead in the corrugated gas duct is electrified to enable electrorheological fluid between the inner corrugated tube and the outer corrugated tube to be hardened, and further the corrugated gas duct is rigid as a whole and is not easy to deform, and at the moment, the working end table and the movable joint are limited and fixed by the corrugated gas duct;

s4, in the cutting process by using the circular serrated blade, air flow is introduced into the hollow rotating shaft through the induced draft fan in the rotating column, so that the air flow is sprayed out through the circular serrated blade, blood and biological tissues adhered to the circular serrated blade in the cutting process are blown down by the air flow, and the biological tissues on the circular serrated blade are prevented from being accumulated to influence the cutting work.

3. Advantageous effects

Compared with the prior art, the invention has the advantages that:

(1) this scheme can realize polishing and cutting work as required at the operation in-process, and the work end can freely be adjusted, adapts to multiple different service environment easily, through dead fixed movable rod of lock and ripple air duct, guarantees the stability of work end during operation.

(2) Corrugated air duct includes interior bellows, outer bellows has been cup jointed in the outside of interior bellows, it has the electrorheological fluid to fill between interior bellows and the outer bellows, all be connected with the sealing ring between the both ends of interior bellows and outer bellows, be connected with a plurality of elastic lead between two sealing rings, and elastic lead is located between bellows and the outer bellows, lead to the electrorheological fluid sclerosis of corrugated air duct after the elasticity lead circular telegram, make the space between bellows and the outer bellows fill by the electrorheological fluid of sclerosis, make corrugated air duct be in the not tensile state of bending, with this lock that realizes corrugated air duct dies.

(3) Smooth discs are sleeved at two ends of the hollow rotating shaft, a one-way air valve is connected between the smooth discs and the hollow rotating shaft, and a plurality of air outlets which are uniformly distributed and matched with the one-way air valve are formed in the smooth discs, so that air flow in the hollow rotating shaft can be discharged through the air outlets, and the discharged air flow impacts the rotating circular sawtooth blade.

(4) The one end that the movable rod is close to the spliced pole is the ball-type, be equipped with a pair of and movable rod assorted damping fin in the spliced pole, a pair of electro-magnet ring that matches with the damping fin of fixedly connected with on the inner wall of spliced pole, the one end fixedly connected with permanent magnet that the damping fin is close to the electromagnetism iron ring, be connected with a plurality of elastic fiber lines between damping fin and the electro-magnet ring, make the electromagnetism iron ring under the on-state, produce the repulsion between electromagnetism iron ring and the damping fin, and then make the damping fin extrude the circular end of movable rod, realize locking the movable rod, and elastic fiber line is used for binding up under the circular on-state of electromagnetism iron ring, the damping fin makes the damping fin not contact with the spherical end of movable rod.

(5) The power box is internally provided with a power supply matched with the electric push rod, the rotating column is internally provided with a controller, the electromagnet ring and the elastic lead are electrically connected with the controller, the fixed column and the long arm rod are respectively connected with a power supply interface and a plug which are matched with each other, and the plug is electrically connected with the power supply, so that the electromagnet ring and the elastic lead are simultaneously electrified, and the centralized control of the device is facilitated.

Drawings

FIG. 1 is a perspective view of the present invention;

FIG. 2 is a perspective view of the present invention during cutting operations;

FIG. 3 is a cross-sectional view of the present invention;

FIG. 4 is a schematic view of the structure at A in FIG. 3;

FIG. 5 is a schematic view of the structure at B in FIG. 3;

fig. 6 is a schematic structural diagram at C in fig. 3.

The reference numbers in the figures illustrate:

the device comprises a handheld arm 1, a power box 2, an electric push rod 201, a long arm rod 3, a movable joint 4, a rotary column 401, a fixed column 402, a connecting column 403, a damping fin 404, an electromagnet ring 405, a movable rod 5, a working end table 6, a shell 601, a servo motor 602, a hollow rotating shaft 7, a circular sawtooth blade 8, a corrugated air duct 9, an inner corrugated tube 901, an outer corrugated tube 902 and a polishing piece 10.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the connection can be direct connection or indirect connection through an intermediate medium, and can be communication inside the model adapting element. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1:

referring to fig. 1-4, a small bone saw for joint surgery comprises a hand-held arm 1, a power box 2 is fixedly connected to the hand-held arm 1, a charging wire can be installed on the power box 2, a storage battery is arranged in the power box 2, the power box 2 can be electrically connected to an external power source through the charging wire, a long arm rod 3 is inserted into the power box 2, an electric push rod 201 matched with the long arm rod 3 is fixedly connected to the power box 2, the electric push rod 201 is electrically connected to the electric push rod 201, a movable joint 4 is fixedly connected to one end of the long arm rod 3 away from the power box 2, the movable joint 4 comprises a rotary column 401, two ends of the rotary column 401 are respectively connected to a fixed column 402 and a connecting column, the fixed column 402 is clamped to the long arm rod 3, a stepping motor is installed in the fixed column 402, a conducting wire 403 is laid in the long arm rod 3, the stepping motor is electrically connected to the power source, the power output end of the stepping motor is fixedly connected with the rotary column 401, the connecting column 403 is rotatably connected with the movable rod 5, one end of the power box 2, far away from the handheld arm 1, is fixedly connected with a rigid support ring matched with the long arm rod 3, and the long arm rod 3 is connected with the rigid support ring in a sliding mode. Install in the headstock 2 with electric putter 201 assorted power supply, install the controller in the column spinner 401, electromagnet ring 405 and elastic conductor all with controller electric connection, be connected with power interface and the plug that matches each other on fixed column 402 and the long arm pole 3 respectively, power electric connection in plug and the headstock makes electromagnet ring 405 and elastic conductor circular telegram simultaneously, makes things convenient for device's centralized control.

Referring to fig. 3-4, one end of the movable rod 5 close to the connecting column 403 is spherical, a pair of damping plates 404 matched with the movable rod 5 is arranged in the connecting column 403, a pair of electromagnet rings 405 matched with the damping plates 404 are fixedly connected to the inner wall of the connecting column 403, a permanent magnet is fixedly connected to one end of the damping plates 404 close to the electromagnet rings 405, a plurality of elastic fiber wires are connected between the damping plates 404 and the electromagnet rings 405, so that when the electromagnet rings 405 are in an electrified state, a repulsive force is generated between the electromagnet rings 405 and the damping plates 404, and the damping plates 404 are pressed against the circular end of the movable rod 5 to lock the movable rod 5, while the elastic fiber wires are used for retracting the electromagnet rings 405 in an unpowered state, and the damping plates 404 are not in contact with the spherical end of the movable rod 5. Fixedly connected with filter screen on the air inlet of air draught fan in column spinner 401, the joint has the sponge piece on the filter screen, and the sponge piece adsorbs has disinfectant fluid, makes the air current that the air draught fan introduced can be disinfected.

Referring to fig. 3-6, one end of the movable rod 5, which is far away from the movable joint 4, is fixedly connected with a working end table 6, the working end table 6 includes a housing 601, a mounting hole is drilled in the housing 601, a hollow rotating shaft 7 is rotatably connected in the mounting hole, a sealing bearing is connected between the upper end and the lower end of the hollow rotating shaft 7 and the housing 601, a circular serrated blade 8 is fixedly connected to the hollow rotating shaft 7, both ends of the hollow rotating shaft 7 are respectively sleeved with a smooth disk 801, a one-way air valve 802 is connected between the smooth disk 801 and the hollow rotating shaft 7, a plurality of air outlets which are uniformly distributed and matched with the one-way air valve 802 are formed in the smooth disk 801, so that air in the hollow rotating shaft 7 can be discharged through the air outlets, and the discharged. Fixedly connected with servo motor 602 in casing 601, be connected with the driving chain between servo motor 602's the power take off end and the hollow pivot 7, servo motor 602 rotates through driving chain drive hollow pivot 7 during operation, install the draught fan in the column spinner 401, be connected with ripple air duct 9 between draught fan and the hollow pivot 7, the end of giving vent to anger of draught fan communicates with each other with ripple air duct 9's inner tube, hollow pivot 7 is hollow structure, and the cavity in the hollow pivot 7 communicates with each other with ripple air duct 9's inner tube, the upper and lower both ends of casing 601 all are connected with polishing piece 10, one of them polishing piece 10 is last to be dug a plurality of teeth of polishing.

Referring to fig. 3, 5 and 6, the corrugated gas-guide tube 9 includes an inner corrugated tube 901, an outer corrugated tube 902 is sleeved outside the inner corrugated tube 901, electrorheological fluid is filled between the inner corrugated tube 901 and the outer corrugated tube 902, sealing rings are connected between two ends of the inner corrugated tube 901 and the outer corrugated tube 902, a plurality of elastic leads are connected between the two sealing rings, the elastic leads are located between the inner corrugated tube 901 and the outer corrugated tube 902, the inner corrugated tube 901 and the outer corrugated tube 902 are both made of elastic insulating materials, the electrorheological fluid of the corrugated gas-guide tube 9 is hardened after the elastic leads are electrified, so that a space between the inner corrugated tube 901 and the outer corrugated tube 902 is filled with the hardened electrorheological fluid, and the elastic leads are in contact with the electrorheological fluid, so that the corrugated gas-guide tube 9 is in an unstretchable bending state, thereby achieving locking of the corrugated gas-guide tube 9. The ripple air duct 9 is last to have cup jointed supplementary handheld cover, and the internal diameter of supplementary handheld cover is greater than the biggest external diameter of ripple air duct 9, and ripple air duct 9 circular telegram sclerosis back, technical staff can hand supplementary handheld cover and assist fixedly to the device, guarantees bone saw during operation device stability, reduces the vibrations of device during operation.

A small bone saw for joint surgery comprises the following using methods:

s1, before use, technicians control the fixing column 402 to work according to work requirements, and select the working end table 6 to polish or cut;

s2, controlling the fixed column 402 to drive the rotary column 401 to rotate for 90 degrees, enabling the circular serrated blade 8 to be in a vertical state, cutting by using the circular serrated blade 8, and enabling the circular serrated blade 8 to be in a horizontal state when the fixed column 402 does not work, and polishing by using the polishing plate 10;

s3, a technician can adjust the movable rod 5 according to the working environment to enable the position of the circular sawtooth blade 8 to adapt to the operating environment, after the inclination angle of the movable rod 5 is determined, the electromagnet ring 405 is electrified to enable the damping sheet 404 to lock the movable rod 5 under the action of repulsion force, so that the spherical end of the movable rod 5 is fixed, meanwhile, the elastic lead in the corrugated air duct 9 is electrified to harden the electrorheological fluid between the inner corrugated tube 901 and the outer corrugated tube 902, so that the corrugated air duct 9 is rigid and not easy to deform, and at the moment, the working end table 6 and the movable joint 4 are limited and fixed by the corrugated air duct 9;

s4, in the cutting process by using the circular serrated blade 8, air flow is introduced into the hollow rotating shaft 7 through the induced draft fan in the rotating column 401, so that the air flow is sprayed out through the circular serrated blade 8, blood and biological tissues adhered to the circular serrated blade 8 in the cutting process are blown down by the air flow, and the biological tissues on the circular serrated blade 8 are prevented from being accumulated to influence the cutting work.

According to the scheme, the position and the rotation angle of the working end of the bone saw can be adjusted in the using process, medical staff can perform an operation in any hand-held mode and operation position in the operation process, so that the bone saw is not used in a narrow operation space at first, incomplete bone joint cutting and polishing operation caused by insufficient use space is greatly prevented, and the operation error rate of technicians is greatly reduced;

can realize polishing and cutting work as required in the operation process, the work end can be adjusted freely, adapts to multiple different service environment easily, through locking fixed movable rod 5 and ripple air duct 9, behind the ripple air duct 9 that locks, ripple air duct 9 sclerosis, technical staff still can hand ripple air duct 9 and assist fixedly, makes the work end during operation of bone saw more stable, greatly guarantees the stability of work end during operation.

The foregoing is only a preferred embodiment of the present invention; the scope of the invention is not limited thereto. Any person skilled in the art should be able to cover the technical scope of the present invention by equivalent or modified solutions and modifications within the technical scope of the present invention.

Claims

1. The utility model provides a small-size bone saw is used in joint operation, includes handheld arm (1), fixed connection has headstock (2), its characterized in that on handheld arm (1): the power box is characterized in that a long arm rod (3) is inserted into the power box (2), an electric push rod (201) matched with the long arm rod (3) is fixedly connected into the power box (2), a movable joint (4) is fixedly connected to one end, far away from the power box (2), of the long arm rod (3), the movable joint (4) comprises a rotary column (401), two ends of the rotary column (401) are respectively connected with a fixed column (402) and a connecting column (403), the fixed column (402) is clamped with the long arm rod (3), a stepping motor is installed in the fixed column (402), a power output end of the stepping motor is fixedly connected with the rotary column (401), a movable rod (5) is rotatably connected onto the connecting column (403), one end, far away from the movable joint (4), of the movable rod (5) is fixedly connected with a working end table (6), and the working end table (6) comprises a shell (601), the utility model discloses a grinding machine, including casing (601), be connected with hollow rotating shaft (7) in the casing (601), go up the chisel in casing (601), the rotation is connected with hollow rotating shaft (7), circular sawtooth blade (8) of fixedly connected with on hollow rotating shaft (7), fixedly connected with servo motor (602) in casing (601), be connected with the driving chain between the power take off end of servo motor (602) and hollow rotating shaft (7), install the draught fan in column spinner (401), be connected with ripple air duct (9) between draught fan and hollow rotating shaft (7), the upper and lower both ends of casing (601) all are connected with grinding piece (10), one of them the chisel has a plurality of teeth of polishing on grinding piece (10).

2. A small bone saw for joint surgery as defined in claim 1, wherein: the corrugated gas guide pipe (9) comprises an inner corrugated pipe (901), an outer corrugated pipe (902) is sleeved on the outer side of the inner corrugated pipe (901), electrorheological fluid is filled between the inner corrugated pipe (901) and the outer corrugated pipe (902), sealing rings are connected between the two ends of the inner corrugated pipe (901) and the two ends of the outer corrugated pipe (902), a plurality of elastic leads are connected between the two sealing rings, and the elastic leads are located between the inner corrugated pipe (901) and the outer corrugated pipe (902).

3. A small bone saw for joint surgery as defined in claim 1, wherein: smooth disc (801) are all cup jointed at the both ends of hollow pivot (7), be connected with one-way air valve (802) between smooth disc (801) and hollow pivot (7), set up a plurality of evenly distributed and with one-way air valve (802) assorted venthole on smooth disc (801).

4. A small bone saw for joint surgery as defined in claim 1, wherein: the one end that spliced pole (403) are close to in movable rod (5) is the ball-type, be equipped with in spliced pole (403) a pair of with movable rod (5) assorted damping fin (404), fixedly connected with is a pair of and damping fin (404) assorted electromagnetism iron ring (405) on the inner wall of spliced pole (403), be connected with a plurality of elastic fiber lines between damping fin (404) and electromagnetism iron ring (405).

5. A small bone saw for joint surgery as defined in claim 1, wherein: fixedly connected with filter screen on the air inlet of air guide machine in column spinner (401), the joint has the sponge piece on the filter screen, the sponge piece adsorbs has the sterile water.

6. A small bone saw for joint surgery as defined in claim 1, wherein: one end fixedly connected with that handheld arm (1) was kept away from in headstock (2) and long armed lever (3) assorted rigidity support ring, 3 and rigidity support ring sliding connection.

7. A small bone saw for joint surgery as defined in claim 1, wherein: and sealing bearings are connected between the upper end and the lower end of the hollow rotating shaft (7) and the shell (601).

8. A small bone saw for joint surgery as defined in claim 1, wherein: install in headstock (2) with electric putter (201) assorted power supply, install the controller in column spinner (401), electromagnetism magnet ring (405) and elastic wire all with controller electric connection, be connected with power supply interface and the plug that matches each other on fixed column (402) and long armed lever (3) respectively, plug and power supply electric connection.

9. A small bone saw for joint surgery as defined in claim 1, wherein: an auxiliary handheld sleeve is sleeved on the corrugated air duct (9), and the inner diameter of the auxiliary handheld sleeve is larger than the maximum outer diameter of the corrugated air duct (9).

10. A small bone saw for joint surgery as defined in claim 1, wherein: the using method comprises the following steps:

s1, before use, technicians control the fixed columns (402) to work according to work requirements, and select the working end table (6) to be used for grinding or cutting;

s2, controlling the fixed column (402) to drive the rotating column (401) to rotate for 90 degrees, enabling the circular serrated blade (8) to be in a vertical state, cutting by using the circular serrated blade (8), enabling the circular serrated blade (8) to be in a horizontal state when the fixed column (402) does not work, and polishing by using the polishing sheet (10);

s3, a technician can adjust the movable rod (5) according to the working environment to enable the position of the circular sawtooth blade (8) to adapt to the operating environment, after the inclination angle of the movable rod (5) is determined, the electromagnet ring (405) is electrified, the damping sheet (404) locks the movable rod (5) under the action of repulsive force, the spherical end of the movable rod (5) is fixed, meanwhile, an elastic lead in the corrugated air duct (9) is electrified, electrorheological fluid between the inner corrugated tube (901) and the outer corrugated tube (902) is hardened, the corrugated air duct (9) is made to be rigid as a whole and not prone to deformation, and at the moment, the working end table (6) and the movable joint (4) are limited and fixed by the corrugated air duct (9);

s4, in the cutting process by using the circular serrated blade (8), air flow is introduced into the hollow rotating shaft (7) through the induced draft fan in the rotating column (401) to be sprayed outwards through the circular serrated blade (8), so that blood and biological tissues adhered to the circular serrated blade (8) in the cutting process are blown down by the air flow, and the biological tissues on the circular serrated blade (8) are prevented from being accumulated to influence the cutting work.