A medical micro-power torque screwdriver

Abstract

The present invention provides a medical micro-power torque screwdriver, comprising a screwdriver handle, a screwdriver rod, a coaxial interlocking sleeve and a micro motor. The front and rear ends of the screwdriver handle are respectively provided with a front cover and a rear cover, the front cover is provided with a front socket, the coaxial interlocking sleeve and the micro motor are both located in the screwdriver handle, a spring is provided between the coaxial interlocking sleeve and the inner wall of the front cover, the screwdriver rod passes through the front socket and the inner ring of the spring and is connected to one end of the coaxial interlocking sleeve, and the other end of the coaxial interlocking sleeve is connected to the micro motor. The present invention solves the problem of excessive physical labor caused by medical staff holding a handheld electric drill for a long time by adopting a micro motor and a torque control system, and avoids the adverse situation of screw tail slipping and cold welding; the bit sleeve or electric drill chuck is used, which is compatible with bits of different sizes, has adjustable torque, high adaptability, and significantly reduces bacterial contamination compared to ordinary electric drills, making it very suitable for use in hospitals and medical staff.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, in particular to a medical micro-power torque screwdriver. Background Art

[0002] The existing orthopedic power systems are all orthopedic electric drills, which are used to drill screw channels during the implantation of orthopedic internal fixators to facilitate the insertion of fixing screws. However, the screws are screwed in manually, especially when screwing in locking screws. Due to the fine pitch of the screws, it takes a long time to screw in, which is time-consuming and labor-intensive, greatly increasing the workload of medical staff. Electric drills are sometimes used clinically to assist in screwing in the screws, but electric drills are bulky and require repeated switching between the screwdriver head and the drill bit, increasing the workload of the instrument nurse. In addition, electric drills are powerful and may accidentally screw in the screws or even strip the threads, resulting in damage to the screw tail or even inability to remove them. In addition, electric drills are bulky and can easily cause the screw insertion direction to deviate, affecting the fixation effect. Summary of the Invention

[0003] The purpose of the present invention is to provide a medical micro-power torque screwdriver, which is driven by a micro motor so that medical staff do not have to manually screw in the screws. The coaxial interlocking sleeve is used to achieve torque control to prevent the screws from being damaged by over-torque.

[0004] The present invention provides a medical micro-power torque screwdriver, comprising a screwdriver handle, a screwdriver rod, a coaxial interlocking sleeve and a micro motor. The front end and rear end of the screwdriver handle are respectively provided with a front end cover and a rear end cover, the front end cover is provided with a front end socket, the coaxial interlocking sleeve and the micro motor are both located in the screwdriver handle, a spring is provided between the coaxial interlocking sleeve and the inner wall of the front end cover, the screwdriver rod passes through the front end socket and the inner ring of the spring and is connected to one end of the coaxial interlocking sleeve, and the other end of the coaxial interlocking sleeve is connected to the micro motor.

[0005] Furthermore, the screwdriver rod includes a transmission rod, a bit sleeve and a bit, one end of the transmission rod is connected to one end of the coaxial interlocking sleeve, and the other end of the transmission rod is connected to the bit through the bit sleeve.

[0006] Furthermore, the screwdriver rod includes a transmission rod, an electric drill chuck and a bit, one end of the transmission rod is connected to one end of the coaxial interlocking sleeve, and the other end of the transmission rod is connected to the bit through the electric drill chuck.

[0007] Furthermore, the coaxial interlocking sleeve includes a driving toothed sleeve and a driven toothed sleeve, and the driving toothed sleeve and the driven toothed sleeve both include a cylindrical body and helical teeth, and the helical teeth are axially opened on the edge of the cylindrical mouth of the cylindrical body. The driving toothed sleeve and the driven toothed sleeve are connected by the bite action of the helical teeth, and the helical teeth have rounded corners.

[0008] Furthermore, the cylindrical body of the active toothed sleeve is open at both ends, and the end of the cylindrical body of the driven toothed sleeve away from the helical teeth is a closed end and is provided with an external connecting hole, and the transmission rod is inserted into the external connecting hole.

[0009] Furthermore, a transmission shaft is connected to the output end of the micromotor, and the end of the transmission shaft away from the micromotor passes through the active toothed sleeve and is inserted into the driven toothed sleeve. The transmission shaft drives the active toothed sleeve to rotate, and there is a gap between the transmission shaft and the driven toothed sleeve.

[0010] Furthermore, an annular groove is provided on the outer side of the closed end of the driven toothed sleeve and the inner wall of the front end cover, and the annular groove is used to fix the spring.

[0011] Furthermore, the front end cover is threadedly connected to the screwdriver handle.

[0012] Furthermore, a battery pack is provided in the screwdriver handle, and the battery pack is connected to the micro motor. An inner flange is provided on the inner wall of the screwdriver handle, and the inner flange is used to fix the micro motor. The screwdriver rod rotates freely in the front end socket.

[0013] Furthermore, a micro motor switch is provided in the rear end cover, and the micro motor switch is used to control the circuit connection between the micro motor and the battery pack.

[0014] The beneficial effects of the present invention are:

[0015] 1. By adopting a micro motor, the size and weight of the electric screwdriver are reduced, which can solve the problem of medical staff holding the handheld electric drill for a long time during surgery, which significantly increases the physical labor of medical staff and consumes their energy and physical strength;

[0016] 2. The use of a torque control system avoids the unfavorable situation of the screw tail slipping and cold welding caused by the excessive power of the electric drill when tightening the screw during the operation. The power and speed of the electric drill need to be carefully controlled when screwing the screw in.

[0017] 3. The use of screwdriver bit sleeves or electric drill chucks is fully compatible with screwdriver bits of different sizes used in orthopedic surgery. The replacement of screwdriver bits is simple and quick, reducing the cost of purchasing screwdrivers. Only screwdriver bits of different diameters are needed, saving production costs and material consumption.

[0018] 4. The torque is adjustable and highly adaptable. When different torques are required, the degree of screwing of the front cover can be adjusted appropriately to control the spring force and thus the torque, making it more widely applicable to various medical surgeries.

[0019] 5. Due to its small size and low power, the vibration amplitude and noise are also low, which can reduce the patient's tension. At the same time, because the working parts are all running internally, the bacterial contamination is significantly reduced compared to ordinary electric drills, which is very suitable for use in hospitals and medical staff.

[0020] 6. Simple structure, low production cost, easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are 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.

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 For the present invention Figure 1 Schematic diagram of the internal structure:

[0024] Figure 3 This is a schematic diagram of Example 2 of the present invention:

[0025] Figure 4 This is a schematic diagram of the cross-sectional structure of the present invention:

[0026] Figure 5 Schematic diagram of the screwdriver handle of the present invention:

[0027] Figure 6 This is an exploded diagram of the coaxial interlocking sleeve and the transmission shaft in the present invention:

[0028] Figure 7 This is a schematic diagram of the coaxial mutually clamping sleeve, transmission shaft and transmission rod in the present invention:

[0029] Figure 8 For the present invention Figure 6 Section view of:

[0030] Figure 9 This is a schematic diagram of the connection method of the transmission rod in the present invention:

[0031] Figure 10 Schematic diagram of the spring and the annular groove in the present invention;

[0032] Description of reference numerals:

[0033] In the figure: 1-screwdriver handle, 101-front end cover, 102-rear end cover, 103-inner flange, 2-screwdriver rod, 201-transmission rod, 202-bit sleeve, 203-bit, 204-electric drill chuck, 3-coaxial mutual clamping sleeve, 301-driving toothed sleeve, 302-driven toothed sleeve, 303-helical teeth, 304-external connecting hole, 4-micro motor, 5-spring, 6-battery pack, 7-transmission shaft, 8-annular groove. DETAILED DESCRIPTION

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

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected", and "connected" 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 it can be an indirect connection through an intermediate medium, or it can be a communication between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0037] Example 1

[0038] like Figure 1 or Figure 5 As shown, the present invention provides a medical micro-power torque screwdriver, including a screwdriver handle 1, a screwdriver rod 2, a coaxial interlocking sleeve 3 and a micro motor 4. The front end and rear end of the screwdriver handle 1 are respectively provided with a front end cover 101 and a rear end cover 102, and the front end cover 101 is provided with a front end socket. The coaxial interlocking sleeve 3 and the micro motor 4 are both located in the screwdriver handle 1. A spring 5 is provided between the coaxial interlocking sleeve 3 and the inner wall of the front end cover 101. The screwdriver rod 2 passes through the front end socket and the inner ring of the spring 5 and is connected to one end of the coaxial interlocking sleeve 3, and the other end of the coaxial interlocking sleeve 3 is connected to the micro motor 4. The coaxial interlocking sleeve 3 serves as a torque control device, connecting the micro motor 4 and the screwdriver rod 2, that is, the micro motor 4 drives the screwdriver rod 2 through the coaxial interlocking sleeve 3 to tighten the screw. The micro motor 4 serves as a driving element and provides power during the tightening process. The micro motor 4 is a common product on the market, such as JGB37-3650, with a maximum torque of 35KG.CM, which is fully capable of completing the screw tightening work under medical conditions. Its structure will not be described here.

[0039] like Figure 2 or Figure 9 As shown, the screwdriver rod 2 includes a transmission rod 201, a bit sleeve 202 and a bit 203. One end of the transmission rod 201 is connected to one end of the coaxial interlocking sleeve 3, and the other end of the transmission rod 201 is connected to the bit 203 through the bit sleeve 202.

[0040] The screwdriver bar 2 can be an integrally formed integral bar, that is, the specifications of the screwdriver are fixed, and more preferably a bar with a replaceable bit 203. The transmission rod 201 transmits the rotational force of the driven toothed sleeve 302 to the bit sleeve 202, and then to the bit 203. Although not shown in the figure, it should be easy to understand that the connection between the transmission rod 201 and the driven toothed sleeve 302 is non-free rotation. For example, the inner wall of the external connection hole 304 on the driven toothed sleeve 302 and the outer wall of the transmission rod 201 should be a polygonal body with a clearance fit, so that the driven toothed sleeve 302 can drive the transmission rod 201 to rotate. The movable rod 201 rotates, and the role of the bit sleeve 202 is to be compatible with different sizes of bits 203. When the user needs to tighten screws of different specifications, he only needs to insert the bits 203 of different specifications into the bit sleeve 202. Generally, the bit sleeve 202 and the bit 203 are magnetically connected axially, which is a common technology and will not be repeated here. In addition, depending on the needs of the user, the length of the transmission rod 201 can be designed in different shapes. At this time, in order to prevent eccentric swing caused by excessive length during the tightening process, a bearing can be designed in the screwdriver handle 1 to radially fix and support the transmission rod 201.

[0041] like Figure 6 As shown, the coaxial interlocking sleeve 3 includes a driving toothed sleeve 301 and a driven toothed sleeve 302. The driving toothed sleeve 301 and the driven toothed sleeve 302 both include a cylindrical body and helical teeth 303. The helical teeth 303 are axially arranged on the edge of the cylindrical body. The driving toothed sleeve 301 and the driven toothed sleeve 302 are connected by the bite action of the helical teeth 303. The helical teeth 303 have rounded corners.

[0042] The bite action of the helical teeth 303 is specifically that the helical teeth 303 are approximately in the shape of a right triangle. When the micro motor 4 rotates in the tightening direction, the oblique sides of the active toothed sleeve 301 and the driven toothed sleeve 302 are pressed tightly. Through the pressing force, that is, the elastic force of the spring 5, the active toothed sleeve 301 drives the driven toothed sleeve 302 to rotate. When the micro motor 4 rotates in the unscrewing direction, since torque control is not required at this time, the active toothed sleeve 301 and the driven toothed sleeve 302 pass through the right angle side. The interaction between the active toothed sleeve 301 and the driven toothed sleeve 302 enables the active toothed sleeve 301 to drive the driven toothed sleeve 302 to rotate; the effect of making the top position of the helical teeth 303 have a slight rounded corner is that if the top slope of the helical teeth 303 is too large, when the torque reaches the set value, the helical teeth 303 of the active toothed sleeve 301 and the driven toothed sleeve 302 may still not slip, causing over-torque and damaging the screw tailstock. In addition, the rounded corner can reduce the tip friction damage caused by slipping of the helical teeth 303, thereby increasing the service life of the toothed sleeve.

[0043] like Figure 7 or Figure 8 As shown, the cylindrical body of the active toothed sleeve 301 is open at both ends, and the end of the cylindrical body of the driven toothed sleeve 302 away from the helical teeth 303 is a closed end and is provided with an external connection hole 304. The transmission rod 201 is inserted into the external connection hole 304, and the output end of the micro motor 4 is connected to the transmission shaft 7. The end of the transmission shaft 7 away from the micro motor 4 passes through the active toothed sleeve 301 and is inserted into the driven toothed sleeve 302. The transmission shaft 7 drives the active toothed sleeve 301 to rotate, and there is a gap between the driven toothed sleeve 302 and the transmission shaft 7.

[0044] Torque control is achieved by slipping between the helical teeth 303 of the active toothed sleeve 301 and the driven toothed sleeve 302. However, slipping may also cause the axes of the two toothed sleeves to be misaligned, thereby causing the driven toothed sleeve 302 to fall off from the active toothed sleeve 301, causing tool failure. Therefore, the role of the transmission shaft 7 is not only to connect the micro motor 4 with the active toothed sleeve 301, but also because the transmission shaft 7 passes through the active toothed sleeve 301 and is inserted into the driven toothed sleeve 302, it acts as a core shaft, so there is a radial gap between the active toothed sleeve 301 and the driven toothed sleeve 302. The support limitation makes the axes of the two toothed sleeves always the same. Of course, there should be a clearance fit between the transmission shaft 7 and the two toothed sleeves, so as to not generate side friction and be able to perform radial correction. The main function of the transmission shaft 7 is to drive the active toothed sleeve 301 to rotate, which can be achieved by slotting the end of the active toothed sleeve 301, designing two side extension rods on the side of the transmission shaft 7, and embedding the two side extension rods into the grooves to realize the function of the active toothed sleeve 301 rotating with the transmission shaft 7, while the driven toothed sleeve 302 is driven to rotate by the active toothed sleeve 301 and has no direct relationship with the transmission shaft 7.

[0045] like Figure 8 or Figure 10 As shown, an annular groove 8 is provided on the outer side of the closed end of the driven toothed sleeve 302 and the inner wall of the front end cover 101 , and the annular groove 8 is used to fix the spring 5 .

[0046] The spring 5 is an important component for achieving torque control. During the screw tightening process, the inclined surface of the helical teeth 303 of the active toothed sleeve 301 exerts a pressure on the inclined surface of the helical teeth 303 of the driven toothed sleeve 302. The component of this pressure on the axis of the driven toothed sleeve 302 is transmitted to the spring 5, and the spring 5 is compressed and recovered by the driven toothed sleeve 302. When the torque reaches a certain value, the spring 5 is compressed to a certain length at the same time, and the contact position between the helical teeth 303 of the active toothed sleeve 301 and the helical teeth 303 of the driven toothed sleeve 302 reaches a critical point, then the driven toothed sleeve 302 and the active toothed sleeve 301 begin to slip, and the torque can no longer be increased. A sound is emitted due to the friction between the teeth, that is, the used The medical staff knows that the screw has been tightened and stops the operation. When the torque disappears, the above-mentioned pressure and the component of the pressure disappear, and the spring 5 rebounds, thereby pressing the driven toothed sleeve 302 onto the active toothed sleeve 301, and the device returns to its initial shape. In this process, because the spring 5 contacts the outer side surface of the closed end of the driven toothed sleeve 302, sliding friction will occur between the two, causing the spring 5 to swing. An annular groove 8 is designed on the outer side surface of the closed end of the driven toothed sleeve 302 so that the end of the spring 5 is located in the annular groove 8 to prevent swinging, or the bottom of the annular groove 8 is designed to be semicircular and have a higher surface finish, etc. The function of the annular groove 8 opened on the inner wall of the front end cover 101 is the same as this and will not be repeated.

[0047] The front end cover 101 is threadedly connected to the screwdriver handle 1. When the front end cover 101 is fixedly connected to the front end of the screwdriver handle 1, the elastic force of the spring 5 caused by the critical slip position is fixed, that is, the torque value is fixed, and the screwdriver is a fixed-torque screwdriver. When the front end cover 101 is not fixedly connected to the front end of the screwdriver handle 1, for example, a threaded connection, the elastic force of the spring 5 at the critical slip position, that is, the torque value, can be changed by adjusting the degree of screwing of the front end cover 101, and the screwdriver is a variable-torque screwdriver.

[0048] like Figure 4 As shown, a battery pack 6 is also provided in the screwdriver handle 1, and the battery pack 6 is connected to the micro motor 4. A circle of inner flange 103 is provided on the inner wall of the screwdriver handle 1, and the inner flange 103 is used to fix the micro motor 4. The screwdriver rod 2 rotates freely in the front socket, and a micro motor 4 switch is provided in the rear end cover 102. The micro motor 4 switch is used to control the circuit connection between the micro motor 4 and the battery pack 6.

[0049] The inner flange 103 serves as a stretcher for the micro motor 4 so that when the entire device is in use, the position of the micro motor 4 is always fixed and does not swing or shake, causing the screwdriver rod 2 to swing eccentrically. The battery pack 6 is connected to the micro motor 4 through a wire, and a switch is designed in the middle of the circuit. The switch can be set on the side wall of the screwdriver handle 1 or integrated in the rear end cover 102. The switch should be a three-way power switch that can control the forward, reverse and stop modes of the micro motor 4. This power switch is already a very common technology in life, such as a single-pole double-throw switch, and its specific structure will not be repeated here. In addition, this device When in use, the micro motor 4 and the screwdriver handle 1 should be fixed, and the output shaft drives the screwdriver rod 2 to rotate freely in the front end socket of the front end cover 101, so the rear end cover 102 also has the function of pressing and fixing the battery pack 6, and then pressing and fixing the micro motor 4. When the screwing degree of the rear end cover 102 is adjusted, the pressing degree of the micro motor 4 on the inner flange 103 is also adjusted accordingly, so that the micro motor 4 will not rotate in the screwdriver handle 1 and cause the screwdriver to fail, or a connecting piece is extended from the micro motor 4, and a coaxial through hole is opened with the inner flange 103, and then a screw or key is used to fix it to prevent rotation.

[0050] Example 2

[0051] like Figure 3 As shown:

[0052] The difference between this embodiment and embodiment 1 is that the transmission rod 201 and the bit 203 are connected by an electric drill chuck 204 instead of a bit sleeve 202 . Other technical solutions are the same as those in embodiment 1 and will not be described again here.

[0053] The screwdriver bar 2 includes a transmission rod 201, an electric drill chuck 204, and a bit 203. One end of the transmission rod 201 is connected to one end of a coaxial interlocking sleeve 3, and the other end of the transmission rod 201 is connected to the bit 203 via the electric drill chuck 204. Compared to the bit sleeve 202, the electric drill chuck 204 has a wider range of applications and provides a more secure clamping force, with a smaller chance or amplitude of eccentric swing. As an assembled product, the electric drill chuck 204 is readily available on the market, such as a self-tightening drill chuck, and its specific structure will not be described in detail.

[0054] When the present device is in use, for Example 1, first install the micro motor 4 and the battery pack 6 from the rear end of the screwdriver handle 1, and use the rear end cover 102 to press the micro motor 4 onto the inner flange 103, and then put the transmission shaft 7, the active toothed sleeve 301, the driven toothed sleeve 302, the transmission rod 201 and the spring 5 in sequence from the front end. After tightening the front end cover 101, insert the bit sleeve 202 on the transmission rod 201, and then insert the bit 203 into the bit sleeve 202, that is, the installation is completed. During use, press the micro motor 4 switch on the rear end cover 102, click to start and drive the bit 203 to automatically tighten the screw. When the torque reaches the set value, the active toothed sleeve 301 and the driven toothed sleeve 302 begin to slip and make a sound, then the medical staff using the present device turns off the micro motor 4 switch and stops the operation.

[0055] For Example 2, it is only necessary to replace the bit sleeve 202 in Example 1 with an electric drill chuck 204, and use the electric drill chuck 204 to tighten and fix the bit sleeve 202. Other usage methods are the same as Example 1 and will not be repeated here.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A medical micro-power torque screwdriver, characterized in that: Including screwdriver handle, screwdriver rod, coaxial card sleeve and a micro motor, the front end and the rear end of the screwdriver handle are respectively provided with a front cover and a rear cover, the front cover is provided with a front socket, the coaxial interlocking sleeve and the micro motor are both located in the screwdriver handle, a spring is provided between the coaxial interlocking sleeve and the inner wall of the front cover, the screwdriver rod passes through the front socket and the inner ring of the spring and is connected to one end of the coaxial interlocking sleeve, and the other end of the coaxial interlocking sleeve is connected to the micro motor; The screwdriver rod includes a transmission rod; The coaxial interlocking sleeve includes a driving toothed sleeve and a driven toothed sleeve, each of which includes a cylindrical body and helical teeth, the helical teeth being axially arranged on the edge of the cylindrical body, the driving toothed sleeve and the driven toothed sleeve being connected by the bite of the helical teeth, and the helical teeth having rounded corners; The cylindrical body of the active toothed sleeve is open at both ends, and the end of the cylindrical body of the driven toothed sleeve away from the helical teeth is a closed end and is provided with an external connection hole, and the transmission rod is inserted into the external connection hole; the output end of the micromotor is connected to a transmission shaft, and the end of the transmission shaft away from the micromotor passes through the active toothed sleeve and is inserted into the driven toothed sleeve, and the transmission shaft drives the active toothed sleeve to rotate, and a gap is formed between the transmission shaft and the driven toothed sleeve; The transmission shaft connects the micro motor with the active toothed sleeve, and the transmission shaft passes through the active toothed sleeve and is inserted into the driven toothed sleeve, playing the role of a core shaft. Therefore, there is a radial support restriction between the active toothed sleeve and the driven toothed sleeve, so that the axes of the two toothed sleeves are always the same. There is a clearance fit between the transmission shaft and the two toothed sleeves, which does not generate side friction and can perform radial correction.

2. A medical micro-power torque screwdriver according to claim 1, characterized in that: The screwdriver rod includes a bit sleeve and a bit, one end of the transmission rod is connected to one end of the coaxial interlocking sleeve, and the other end of the transmission rod is connected to the bit through the bit sleeve.

3. A medical micro-power torque screwdriver according to claim 1, characterized in that: The screwdriver rod includes an electric drill chuck and a bit, one end of the transmission rod is connected to one end of the coaxial interlocking sleeve, and the other end of the transmission rod is connected to the bit through the electric drill chuck.

4. A medical micro-power torque screwdriver according to claim 2 or 3, characterized in that: An annular groove is provided on the outer side of the closed end of the driven toothed sleeve and the inner wall of the front end cover, and the annular groove is used to fix the spring.

5. The medical micro-power torque screwdriver according to claim 4, characterized in that: The front end cover is threadedly connected to the screwdriver handle.

6. A medical micro-power torque screwdriver according to claim 2 or 3, characterized in that: A battery pack is also provided in the screwdriver handle, and the battery pack is connected to the micro motor. A circle of inner flange is provided on the inner wall of the screwdriver handle, and the inner flange is used to fix the micro motor. The screwdriver rod rotates freely in the front end socket.

7. The medical micro-power torque screwdriver according to claim 6, characterized in that: A micro motor switch is provided in the rear end cover, and the micro motor switch is used to control the circuit connection between the micro motor and the battery pack.

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