Tapping and drilling integrated drill bit

Abstract

The utility model relates to the field of medical instruments, and discloses a tapping and drilling integrated drill bit which comprises a shell, an inner drill bit body, an outer drill bit body and a driving mechanism. The inner drill bit is used for drilling, the inner drill bit comprises a drill rod and a drilling part, the drill rod is rotatably installed on the shell, one end of the drilling part is fixed to the drill rod, and the other end of the drilling part is provided with a cutting edge; the outer drill bit is used for tapping, the outer drill bit comprises a sleeve rod and a tapping part, the sleeve rod is rotatably installed on the shell, one end of the tapping part is fixed to the sleeve rod, the diameter of the inner drill bit is smaller than that of the outer drill bit, the inner drill bit coaxially penetrates through the outer drill bit, and the cutting edge extends to the outer portion of one side of the tapping part; the driving mechanism is installed in the shell and used for driving the inner drill bit and the outer drill bit to rotate, and the rotating speed of the inner drill bit is higher than that of the outer drill bit. According to the technical scheme, tapping and drilling can be integrated, the complexity degree of an operation can be reduced, use of operation tools is reduced, and the risk of tapping dislocation can also be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical instrument technical field especially relates to a drill and tap integrated drill bit. BACKGROUND

[0002] Drilling a threaded hole is one of the more common operations in orthopedic surgery. For example, doctors need to drill a threaded hole when performing a spinal correction surgery, a false tooth replacement surgery, a joint fixation surgery, a bone fracture fixation surgery, etc., and then install some appliances or fixing frames to the patient's bones through screws. When drilling, the doctor first drills a threaded pilot hole in the patient's bone with a tapping drill bit, and then taps the threaded pilot hole with a tapping drill bit to form threads on the inner wall of the threaded pilot hole.

[0003] In the prior art, the tapping operation and the drilling operation are performed in two steps, resulting in a long operation time, complicated work steps, and the use of many tools. Moreover, there is a risk of tapping misalignment during tapping, which increases the risk of surgery. SUMMARY

[0004] Therefore, the utility model aims to provide a drill and tap integrated drill bit to solve the problem of the prior art that the tapping operation and the drilling operation are performed in two steps, which is complicated and risky.

[0005] The utility model solves the above technical problems by the following technical means:

[0006] A drill and tap integrated drill bit comprises:

[0007] a housing;

[0008] an inner drill bit for drilling, the inner drill bit comprising a drill rod and a drilling portion, the drill rod being rotatably mounted on the housing, and the drilling portion having a cutting edge at one end and being fixed to the drill rod at the other end;

[0009] an outer drill bit for tapping, the outer drill bit comprising a sleeve rod and a tapping portion, the sleeve rod being rotatably mounted on the housing, and the tapping portion being fixed to the sleeve rod at one end, the diameter of the inner drill bit being smaller than that of the outer drill bit, the inner drill bit being coaxially through the outer drill bit, and the cutting edge extending to the outside of one side of the tapping portion; and

[0010] a driving mechanism mounted in the housing for driving the inner drill bit and the outer drill bit to rotate.

[0011] In a possible implementation, the driving mechanism comprises:

[0012] a reduction gearbox mounted in the housing;

[0013] a speed reduction assembly mounted in the speed reduction box and in transmission connection with the inner drill bit and the outer drill bit; and

[0014] a motor mounted in the speed reduction box and in transmission connection with the speed reduction transmission assembly.

[0015] In one possible implementation, the speed reduction assembly comprises a first speed reduction assembly and a second speed reduction assembly, the first speed reduction assembly is in transmission connection between the motor and the inner drill bit, the second speed reduction assembly is in transmission connection between the first speed reduction assembly and the outer drill bit, and the inner drill bit has a higher rotational speed than the outer drill bit.

[0016] In one possible implementation, the first speed reduction assembly comprises a first gear, a second gear, a third gear, a fourth gear, a first rotating shaft and a second rotating shaft;

[0017] The first rotating shaft and the second rotating shaft are rotatably mounted in the speed reduction box, the first gear is mounted on the shaft of the motor, the second gear and the third gear are mounted on the first rotating shaft, the fourth gear is mounted on the second rotating shaft, and one end of the second rotating shaft is in transmission connection with the inner drill bit.

[0018] The first gear and the second gear are in meshing engagement, and the first gear has a smaller number of teeth than the second gear.

[0019] The third gear and the fourth gear are in meshing engagement, and the third gear has a smaller number of teeth than the fourth gear.

[0020] In one possible implementation, the inner drill bit further comprises a connecting key fixed at one end of the drill rod away from the drilling portion, and one end of the second rotating shaft is provided with a connecting hole adapted to the connecting key.

[0021] In one possible implementation, the second speed reduction assembly comprises a fifth gear, a sixth gear, a seventh gear, an eighth gear and a third rotating shaft;

[0022] The third rotating shaft is rotatably mounted in the speed reduction box, the fifth gear is mounted on the second rotating shaft, the sixth gear and the seventh gear are mounted on the third rotating shaft, and the eighth gear is in transmission connection with the outer drill bit.

[0023] The fifth gear and the sixth gear are in meshing engagement, and the fifth gear has a smaller number of teeth than the sixth gear.

[0024] The seventh gear and the eighth gear are in meshing engagement, and the seventh gear has a smaller number of teeth than the eighth gear.

[0025] In one possible implementation, a tubular output shaft is further included, the output shaft is rotatably mounted in the housing, and the eighth gear is mounted on the output shaft.

[0026] The sleeve rod of the outer drill bit can be partially inserted into the output shaft, and an end of the sleeve rod away from the tapping portion is provided with a connecting notch, and the output shaft is provided with a connecting block matched with the connecting notch.

[0027] In a possible implementation, a spacer is further included, and the spacer is installed between the housing and the output shaft.

[0028] In a possible implementation, a locking sleeve is further included, and the locking sleeve is slidably sleeved on the output shaft in the axial direction, and the locking sleeve is provided with an elastic reset member.

[0029] A plurality of through holes are formed in the output shaft, and a steel ball is movably installed in each through hole, and part of the structure of the steel ball can be moved out of the through hole, and a ring groove matched with the steel ball is formed in the sleeve rod of the outer drill bit.

[0030] When the locking sleeve is in contact with the steel ball, the steel column can be extruded into the ring groove.

[0031] In a possible implementation, a cavity for installing a battery is formed in the housing, and a housing bottom cover is detachably installed at an open end of the cavity.

[0032] The utility model discloses the beneficial effects of:

[0033] 1. When the doctor implements the drilling operation, the inner drill bit and the outer drill bit can be driven to rotate by the driving mechanism, the thread bottom hole is first punched by the inner drill bit, and then the tapping is carried out on the thread bottom hole by the outer drill bit, so that the drilling and tapping are integrated, the operation complexity is reduced, the use of surgical tools is reduced, and the risk of tapping misplacement is reduced.

[0034] 2. The rotation speed of the outer drill bit is lower than that of the inner drill bit, the rotation speed of the inner drill bit is faster, the thread bottom hole can be punched efficiently, the rotation speed of the outer drill bit is slower, the outer drill bit can be more stable when tapping, the risk of damaging the patient's bone is reduced, and the safety performance is higher.

[0035] 3. When the locking sleeve extrudes the steel column into the ring groove, the inner drill bit and the outer drill bit are installed on the housing, when the inner drill bit and the outer drill bit need to be detached, the locking sleeve can be moved to one side of the compression elastic reset member, so that the locking sleeve is separated from the steel ball, and then the inner drill bit and the outer drill bit can be taken out, and the operation is convenient. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 It is a structure schematic view of the drilling and tapping integrated drill bit in the embodiment of the application.

[0037] Figure 2is a sectional view of a drill bit integrated with tapping of an embodiment of the present application;

[0038] Figure 3 is an enlarged schematic view of A in an embodiment of the present application Figure 2

[0039] Figure 4 is a structural schematic view of an inner drill bit and an outer drill bit in an embodiment of the present application;

[0040] Figure 5 is an enlarged schematic view of B in an embodiment of the present application Figure 2

[0041] 100, housing; 110, housing bottom cover; 200, inner drill bit; 210, drill rod; 220, drilling portion; 221, cutting edge; 230, connecting key; 300, outer drill bit; 310, sleeve rod; 311, connecting notch; 320, tapping portion; 410, speed reducer; 420, motor; 430, primary speed reduction assembly; 431, first gear; 432, second gear; 433, third gear; 434, fourth gear; 435, first rotating shaft; 436, second rotating shaft; 440, secondary speed reduction assembly; 441, fifth gear; 442, sixth gear; 443, seventh gear; 444, eighth gear; 445, third rotating shaft; 500, output shaft; 510, steel ball; 600, spacer sleeve; 700, locking sleeve; 800, battery. DETAILED DESCRIPTION

[0042] The advantages and effects of the present application can be understood by the skilled in the art from the disclosure of the present specification. It should be noted that the drawings provided in the following embodiments are only used for illustrative explanation, and are schematic views rather than actual drawings, and should not be understood as a limitation of the present application. In order to better illustrate the embodiments of the present application, some components in the drawings may be omitted, enlarged or reduced, and do not represent the actual size of the product; it can be understood by those skilled in the art that some well-known structures and their descriptions may be omitted.

[0043] ​​In the drawings of the embodiments of the utility model, same or similar reference signs correspond to same or similar components, and in the description of the utility model, it should be understood that if the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "front", "back" and the like is based on the orientation or position relationship shown in the drawings, it is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, therefore the terms describing the position relationship in the drawings are only used for exemplary illustration, and cannot be understood as a limitation on the utility model, and for ordinary skilled persons in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0044] As shown in Figures 1-5 The utility model discloses an integrated drill and tapping drill bit, which comprises a shell 100, an inner drill bit 200, an outer drill bit 300 and a driving mechanism. The inner drill bit 200 is used for drilling, and comprises a drill rod 210 and a drilling part 220. The drill rod 210 is rotatably installed on the shell 100, and the body of the drilling part 220 is also rod-shaped, with a diameter smaller than that of the drill rod 210. One end of the drilling part 220 is fixed to the drill rod 210, and the other end is provided with a cutting edge 221 capable of drilling. The outer drill bit 300 is used for tapping, and comprises a sleeve rod 310 and a tapping part 320. The sleeve rod 310 is rotatably installed on the shell 100, and one end of the tapping part 320 is fixed to the sleeve rod 310. The surface of the tapping part 320 is provided with threads for tapping. The diameter of the inner drill bit 200 is smaller than that of the outer drill bit 300. The inner drill bit 200 penetrates the outer drill bit 300 coaxially. The sleeve rod 310 and the tapping part 320 are provided with a channel for the inner drill bit 200 to penetrate. The inner diameter of the sleeve rod 310 is the same as the diameter of the drill rod 210, and the inner diameter of the tapping part 320 is the same as the diameter of the drilling part 220. The drilling part 220 of the drilling part 220 can extend to the outside of one side of the tapping part 320. The driving mechanism is installed in the shell 100 and is used for driving the inner drill bit 200 and the outer drill bit 300 to rotate. The rotation speed of the inner drill bit 200 is higher than that of the outer drill bit 300.

[0045] Through the above technical scheme, when a doctor performs a drilling operation, the inner drill bit 200 and the outer drill bit 300 can be driven to rotate by the driving mechanism. First, the inner drill bit 200 drills a threaded hole, and then the outer drill bit 300 taps the threaded hole, thereby realizing integrated drilling and tapping. This not only reduces the complexity of the operation and the use of surgical tools, but also reduces the risk of tapping misplacement.

[0046] In a possible embodiment, the driving mechanism comprises a reduction box 410, a reduction assembly, and a motor 420. The reduction box 410 is fixedly installed in the housing 100. The reduction assembly is installed in the reduction box 410 and is in driving connection with the inner drill bit 200 and the outer drill bit 300. The motor 420 is installed in the reduction box 410 and is in driving connection with the reduction assembly. The motor 420 can be a servo motor 420 or a stepper motor 420. The power of the motor 420 is transmitted to the inner drill bit 200 and the outer drill bit 300 through the reduction assembly, so as to control the rotation speed and drive the inner drill bit 200 and the outer drill bit 300 to rotate, respectively.

[0047] In a possible embodiment, the reduction assembly comprises a primary reduction assembly 430 and a secondary reduction assembly 440. The primary reduction assembly 430 is in driving connection between the motor 420 and the inner drill bit 200. The secondary reduction assembly 440 is in driving connection between the primary reduction assembly 430 and the outer drill bit 300. The rotation speed of the inner drill bit 200 is higher than that of the outer drill bit 300. The rotation speed of the outer drill bit 300 is lower than that of the inner drill bit 200 through the cooperation of the primary reduction assembly 430 and the secondary reduction assembly 440. The rotation speed of the inner drill bit 200 is relatively fast, which facilitates efficient tapping of a thread hole. The rotation speed of the outer drill bit 300 is relatively slow, which facilitates smooth tapping of the outer drill bit 300, reduces the risk of damaging the patient's bone, and improves safety performance.

[0048] In a possible embodiment, the primary reduction assembly 430 comprises a first gear 431, a second gear 432, a third gear 433, a fourth gear 434, a first rotating shaft 435, and a second rotating shaft 436. The first rotating shaft 435 and the second rotating shaft 436 are rotatably installed in the reduction box 410 through bearings. The first gear 431 is installed on the shaft of the motor 420. The second gear 432 and the third gear 433 are installed on the first rotating shaft 435. The fourth gear 434 is installed on the second rotating shaft 436. One end of the second rotating shaft 436 is in driving connection with the inner drill bit 200. The first gear 431 and the second gear 432 are in meshing connection, and the number of teeth of the first gear 431 is less than that of the second gear 432. The third gear 433 and the fourth gear 434 are in meshing connection, and the number of teeth of the third gear 433 is less than that of the fourth gear 434. The power of the motor 420 is transmitted to the inner drill bit 200 through the cooperation of the first gear 431, the second gear 432, the third gear 433, the fourth gear 434, the first rotating shaft 435, and the second rotating shaft 436.

[0049] In addition, in order to facilitate the transmission connection between the second rotating shaft 436 and the inner drill bit 200, in a possible embodiment, the inner drill bit 200 further comprises a connecting key 230 fixed to the drill rod 210 at an end away from the drilling portion 220, and one end of the second rotating shaft 436 is provided with a connecting hole matched with the connecting key 230, so that when the connecting key 230 is inserted into the connecting hole, the inner drill bit 200 can be coaxially rotated by the second rotating shaft 436.

[0050] In a possible embodiment, the secondary speed reduction assembly 440 comprises a fifth gear 441, a sixth gear 442, a seventh gear 443, an eighth gear 444, and a third rotating shaft 445. The third rotating shaft 445 is rotatably installed in the speed reduction box 410 through a bearing, the fifth gear 441 is installed on the second rotating shaft 436, the sixth gear 442 and the seventh gear 443 are installed on the third rotating shaft 445, and the eighth gear 444 is in transmission connection with the outer drill bit 300, that is, the eighth gear 444 can drive the outer drill bit 300 to rotate when the eighth gear 444 rotates. The fifth gear 441 and the sixth gear 442 are in meshing with each other, and the number of teeth of the fifth gear 441 is less than that of the sixth gear 442; the seventh gear 443 and the eighth gear 444 are in meshing with each other, and the number of teeth of the seventh gear 443 is less than that of the eighth gear 444. Through the cooperation of the fifth gear 441, the sixth gear 442, the seventh gear 443, the eighth gear 444, and the third rotating shaft 445, the secondary speed reduction of the driving mechanism is realized, and the power of the primary speed reduction assembly 430 is transmitted to the outer drill bit 300 again, so that the rotating speed of the outer drill bit 300 is lower than that of the inner drill bit 200.

[0051] In addition, in order to facilitate the transmission connection between the eighth gear 444 and the outer drill bit 300, in a possible embodiment, a tubular output shaft 500 is further included, the output shaft 500 is rotatably installed in the housing 100, and the eighth gear 444 is installed on the output shaft 500. The sleeve rod 310 of the outer drill bit 300 can be partially inserted into the output shaft 500, and an end of the sleeve rod 310 away from the tapping portion 320 is provided with a plurality of connecting notches 311, and the output shaft 500 is provided with a connecting block matched with the connecting notches 311. When the sleeve rod 310 is inserted into the output shaft 500, and the connecting block is inserted into the connecting notches 311, the outer drill bit 300 can be coaxially rotated by the output shaft 500.

[0052] In a possible embodiment, a spacer 600 is further included, and the spacer 600 is installed between the housing 100 and the output shaft 500. Through the spacer 600, the connection between the structures is more compact, so as to improve the stability of the structure.

[0053] In a possible embodiment, in order to facilitate disassembly and replacement of the inner drill bit 200 and the outer drill bit 300, a locking sleeve 700 is further included, which is sleeved on the output shaft 500 in an axially slidable manner, and an elastic reset member is mounted on the locking sleeve 700. The elastic reset member is mainly a spring, which can be mounted between the locking sleeve 700 and the shell 100 or between the locking sleeve 700 and the spacer sleeve 600. A plurality of through holes are formed in the output shaft 500, and a steel ball 510 is movably mounted in the through holes, and part of the structure of the steel ball 510 can move out of the through hole. It should be noted that part of the structure of the steel ball 510 can move out of the through hole, which means that part of the structure of the steel ball 510 can move to the inside and outside of the output shaft 500. A ring groove adapted to the steel ball 510 is formed in the sleeve rod 310 of the outer drill bit 300; when the locking sleeve 700 contacts the steel ball 510, the steel column can be extruded to the inside of the output shaft 500 and into the ring groove of the outer drill bit 300.

[0054] Through the above technical solution, when the locking sleeve 700 extrudes the steel column into the ring groove of the outer drill bit 300, the inner drill bit 200 and the outer drill bit 300 are mounted on the shell 100; when it is necessary to disassemble the inner drill bit 200 and the outer drill bit 300, the locking sleeve 700 can be moved to one side of the compressed elastic reset member, so that the locking sleeve 700 is separated from the steel ball 510, and at this time the steel ball 510 can move in the through hole, so that the inner drill bit 200 and the outer drill bit 300 can be taken out, which is convenient to operate.

[0055] It should be noted that since the diameter of the drill rod 210 of the inner drill bit 200 is greater than the diameter of the drill hole part 220, and the passage of the outer drill bit 300 is adapted to the size of the drill rod 210 and the drill hole part 220. Therefore, the disassembly of the inner drill bit 200 is limited by the outer drill bit 300. That is, only when the locking sleeve 700 releases the restriction on the outer drill bit 300, the inner drill bit 200 can be disassembled.

[0056] In a possible embodiment, a cavity for mounting a battery 800 is arranged in the shell 100, and a shell bottom cover 110 is detachably mounted at the open end of the cavity. The battery 800 provides power supply for the motor 420 through the detachable mode.

[0057] In another embodiment, the motor 420 can also be powered by plugging.

[0058] The above embodiments are only used to illustrate the technical solutions of the present application and are not limited. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently without departing from the purpose and scope of the present application, and all should be covered in the scope of the claims of the present application. The technical, shape and structure parts not described in detail in the present application are well-known technologies.

Claims

1. An integrated drill and attack bit, characterized by, The utility model relates to a drilling and tapping machine, which comprises: a housing (100); an inner drill bit (200) for drilling, the inner drill bit (200) comprising a drill rod (210) rotatably mounted on the housing (100) and a drilling part (220) fixed at one end of the drill rod (210) and having a cutting edge (221) at the other end; an outer drill bit (300) for tapping, the outer drill bit (300) comprising a sleeve rod (310) rotatably mounted on the housing (100) and a tapping part (320) fixed at one end of the sleeve rod (310), the diameter of the inner drill bit (200) being smaller than that of the outer drill bit (300), the inner drill bit (200) being coaxially arranged through the outer drill bit (300), and the cutting edge (221) extending to the outside of one side of the tapping part (320); and a driving mechanism mounted in the housing (100) for driving the inner drill bit (200) and the outer drill bit (300) to rotate, the rotational speed of the inner drill bit (200) being higher than that of the outer drill bit (300). The driving mechanism comprises:

2. The combined drill and tap according to claim 1, wherein, a speed reducer (410) mounted in the housing (100); a speed reduction assembly mounted in the speed reducer (410) and in driving connection with the inner drill bit (200) and the outer drill bit (300); and a motor (420) mounted in the speed reducer (410) and in driving connection with the speed reduction assembly. The speed reduction assembly comprises a primary speed reduction assembly (430) in driving connection between the motor (420) and the inner drill bit (200) and a secondary speed reduction assembly (440) in driving connection between the primary speed reduction assembly (430) and the outer drill bit (300), the rotational speed of the inner drill bit (200) being higher than that of the outer drill bit (300).

3. The combined drill and tap according to claim 2, wherein The primary speed reduction assembly (430) comprises a first gear (431), a second gear (432), a third gear (433), a fourth gear (434), a first rotating shaft (435) and a second rotating shaft (436).

4. The combined drill and tap according to claim 3, wherein The first rotating shaft (435) and the second rotating shaft (436) are rotatably mounted in the speed reducer (410), the first gear (431) is mounted on the shaft of the motor (420), the second gear (432) and the third gear (433) are mounted on the first rotating shaft (435), the fourth gear (434) is mounted on the second rotating shaft (436), and one end of the second rotating shaft (436) is in driving connection with the inner drill bit (200). The first gear (431) and the second gear (432) are in meshing engagement, and the first gear (431) has fewer teeth than the second gear (432). The third gear (433) and the fourth gear (434) are in meshing engagement, and the third gear (433) has fewer teeth than the fourth gear (434). ​ 5. The combined drill and tap according to claim 4, wherein The inner drill bit (200) further comprises a connecting key (230) fixed at the end of the drill rod (210) away from the drilling part (220), and one end of the second rotating shaft (436) is provided with a connecting hole matched with the connecting key (230).

6. The combined drill and tap according to claim 4, wherein The secondary reduction assembly (440) comprises a fifth gear (441), a sixth gear (442), a seventh gear (443), an eighth gear (444) and a third rotating shaft (445). The third rotating shaft (445) is rotatably installed in the reduction box (410), the fifth gear (441) is installed on the second rotating shaft (436), the sixth gear (442) and the seventh gear (443) are installed on the third rotating shaft (445), and the eighth gear (444) is in driving connection with the outer drill bit (300). The fifth gear (441) and the sixth gear (442) are in meshing connection, and the number of teeth of the fifth gear (441) is less than that of the sixth gear (442). The seventh gear (443) and the eighth gear (444) are in meshing connection, and the number of teeth of the seventh gear (443) is less than that of the eighth gear (444).

7. The combined drill and tap according to claim 6, wherein The output shaft (500) is rotatably installed in the housing (100), and the eighth gear (444) is installed on the output shaft (500). The sleeve rod (310) of the outer drill bit (300) can be partially inserted into the output shaft (500), and the end of the sleeve rod (310) away from the tapping part (320) is provided with a connecting notch (311), and the output shaft (500) is provided with a connecting block matched with the connecting notch (311).

8. The combined drill and tap according to claim 7, wherein, The spacer sleeve (600) is installed between the housing (100) and the output shaft (500).

9. The combined drill and tap according to claim 8, wherein, The locking sleeve (700) is slidably sleeved on the output shaft (500) in the axial direction, and the locking sleeve (700) is provided with an elastic reset member. A plurality of through holes are formed in the output shaft (500), and a steel ball (510) is movably installed in the through hole, and part of the structure of the steel ball (510) can move out of the through hole, and a ring groove matched with the steel ball (510) is formed in the sleeve rod (310) of the outer drill bit (300). When the locking sleeve (700) contacts the steel ball (510), the steel column can be extruded into the ring groove.

10. The combined drill and tap according to any one of claims 1 to 9, wherein, The housing (100) is provided with a cavity for installing a battery (800), and a housing bottom cover (110) is detachably installed at the open end of the cavity.

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