Chuck type medical bone drill

Abstract

The invention provides a chuck type medical bone drill which is of a pen-shaped structure, and internal parts are concentrically arranged with a transmission shaft as the axis. The head end of the bone drill is detachably connected with a drill bit through a conical chuck; a locking block which is matched and locked with the conical chuck through a conical surface is arranged in the bone drill; the tail end of the conical chuck is connected with a transmission shaft, a shaft body of the transmission shaft is connected with a button on the side face of the bone drill through a bearing mechanism, and the button is pushed to link the conical chuck to move front and back to achieve opening and closing locking. According to the bone drill, the design structure of the conical chuck is adopted, and the defects that an abrasive drill is popped out and falls off, and a popping mechanism is prone to being clamped when the abrasive drill is put in are overcome; meanwhile, the abrasion drill is locked through front-back movement of the button, compared with knob type locking, the abrasion drill is convenient to install or replace, meanwhile, the internal structure of the bone drill is simplified, dynamic response is timely, friction in the abrasion drill is effectively reduced through the design of one transmission shaft, and the conditions of heat conduction and temperature rise of the abrasion drill are reduced; and high-efficiency operation can be realized under the condition of long-time operation.

Description

Technical Field

[0001] The invention relates to the technical field of medical equipment, and in particular to a chuck-type medical bone drill. Background Art

[0002] As the core component of the orthopedic surgical power system, the bone drill plays a vital role in many delicate surgeries. It integrates the two functions of power transmission and tool clamping to ensure the accuracy and efficiency of the surgical process. Specifically, the clamping part of the bone drill chuck is precisely designed to firmly clamp the surgical tool to prevent it from falling off or deflecting during high-speed rotation, which is the basis for ensuring the safety and success of the operation.

[0003] The power transmission part is the bridge between the bone drill chuck and the surgical power device. It efficiently and seamlessly transmits the powerful power generated by the power device to the tool, driving the tool to rotate at high speed and stably. The accuracy and efficiency of this power transmission directly determines the smoothness and precision of the operation, which is crucial for the delicate treatment of bone tissue.

[0004] Therefore, the medical bone drill is not only a device in the surgical instrument, but also one of the key factors to ensure the success of the operation and the patient's recovery.

[0005] However, there are many problems with current medical high-speed bone drills. First, many high-speed bone drills are equipped with a drill ejection mechanism, but this often causes the drill to eject and fall, and the mechanism is easily stuck when the drill is inserted; the locking knob of the bone drill is often tightened by rotation, which requires a large torque and is not convenient to unlock. The integration of the motor and the handheld device not only makes the entire bone drill large in size, but also directly transmits heat to the doctor's hand, making it difficult to use continuously. Handheld devices often use a gun-style handle, which is difficult to provide high accuracy and is also very inconvenient to use. It also greatly increases the cost of using the tool.

[0006] For example, Chinese invention patent CN 220530081 U relates to a skull drill power handle, in which a motor and a reducer are integrated into the main body of the handle, which greatly increases the weight and heat generation of the handle; Chinese invention patent CN 211156057U discloses an orthopedic electric bone drill, in which a battery is fixed inside the outer shell handle, which has the same problem as the method with a built-in motor; and Chinese invention patent CN 214434376 U discloses a multifunctional medical bone drill, which uses external force to screw the drill onto the bone drill device through a thread, which is relatively complicated. Summary of the invention

[0007] The purpose of the present invention is to provide a chuck-type medical bone drill that reduces heat generation and vibration by simplifying the complex bone drill mechanism and is easy to use. The simplified structural type helps to further increase the rotation speed of the tool. The present invention does not have a motor power part and can be easily adapted to various power sources, greatly reducing the cost of use.

[0008] To achieve the above-mentioned purpose, the present invention provides a chuck-type medical bone drill, which is a pen-shaped structure, and the internal parts are arranged concentrically with the transmission shaft as the axis; the characteristics are that the head end of the bone drill is detachably connected to the drill bit through a conical chuck; the bone drill is provided with a locking block that is locked with the conical chuck through a conical surface;

[0009] The tail end of the conical chuck is connected to the transmission shaft, and the shaft body of the transmission shaft is connected to the button on the side of the bone drill through a bearing mechanism. When the button is pushed, the conical chuck is linked to move forward and backward to realize opening and closing locking.

[0010] Furthermore, the bone drill housing includes a locking head, a front sleeve, a front shell, a rear shell and a rear shell which are coaxially connected in sequence end to end.

[0011] Furthermore, the inner surface of the locking block is provided with a conical surface with the same slope as the outer surface of the conical chuck; by adjusting the relative position of the conical chuck in the locking block, the opening and closing of the clamping part of the conical chuck is achieved by utilizing the cooperation between the conical surfaces.

[0012] Furthermore, the locking block and the conical chuck are located in the front end sleeve; a first bearing is installed between the transmission shaft and the inner wall of the front end sleeve; and a sheath cover plate is installed between the first bearing and the tail of the locking block.

[0013] Further, the bearing mechanism includes a movable bearing seat, a bearing seat cap, a tail shaft nut, a second bearing and a third bearing;

[0014] The movable bearing seat is sleeved on the transmission shaft, a second bearing is arranged between the head end of the movable bearing seat and the transmission shaft, and a bearing seat cap is screwed on the head end of the movable bearing seat to fix the second bearing;

[0015] A third bearing is arranged between the tail end of the movable bearing seat and the transmission shaft. After the tail shaft nut is screwed on the position of the transmission shaft close to the tail end, the third bearing is fixed.

[0016] Furthermore, a waist-shaped hole is provided on the side wall of the rear shell along the axial direction, the button cover is arranged on the waist-shaped hole, and the button is fixed to the movable bearing seat by bolts.

[0017] Furthermore, the length of the waist-shaped hole is the axial movable distance of the tapered chuck.

[0018] Furthermore, the rear end of the transmission shaft is connected to a power input mechanism;

[0019] The power input mechanism includes a power input shaft, a power output shaft, a sleeve, a pin and a bearing sleeve;

[0020] The power input shaft is arranged in the rear end housing, the tail end of the power input shaft is connected to the drive mechanism shaft, the side wall of the head end of the power input shaft is provided with a long strip of slots, the tail end of the power output shaft is provided with a pin hole, after the tail end of the power output shaft is plugged into the head end of the power input shaft, the connection is achieved by plugging the column pin into the slot and the pin hole, the sleeve is sleeved on the connecting end of the power output shaft and the power output shaft, and the column pin is fixed;

[0021] The front half of the power output shaft is located in the rear housing, and a fourth bearing and a fifth bearing are installed between the power output shaft and the inner wall of the rear housing; a first retaining ring is installed between the fourth bearing and the fifth bearing;

[0022] The head end of the power output shaft is stepped, and the axial surface of the bearing sleeve is a matching stepped axial surface. After the bearing sleeve is fixed to the head end of the power output shaft, the fourth bearing and the fifth bearing are pressed between the limiting protrusions inside the rear housing;

[0023] A wire retaining ring is arranged between the inner ring of the stepped axial surface of the bearing sleeve and the end of the power output shaft.

[0024] Furthermore, the rear shell and the rear end shell are fastened by two mutually cooperating "L"-shaped overlaps, and a certain movable gap is reserved between the two "L"-shaped overlaps, and the movable gap is the same as the length of the long strip slot.

[0025] Furthermore, the rear end of the transmission shaft is an I-shaped plug rod, and the front end of the power output shaft is an I-shaped slot. When the plug rod is inserted into the slot, the plug rod can be pulled relative to the slot without being disengaged.

[0026] Compared with the prior art, the advantages of the present invention are:

[0027] 1. The bone drill of the present invention adopts a design structure of a conical chuck, which avoids the disadvantages of the drill being ejected and falling and the ejection mechanism being easily stuck when being inserted; at the same time, the drill is locked by moving the button back and forth, which is convenient for installing or replacing the drill compared to the knob-type locking.

[0028] 2. The pen-shaped overall shell structure is easier to hold, further improving surgical accuracy, making it easier for medical staff to hold and improving surgical accuracy.

[0029] 3. The separate installation of the whole device and the motor makes replacement easier, reduces the weight of the device itself, makes it more convenient to use, has better adaptability and practicality, and greatly reduces the cost of use for patients.

[0030] 4. The bone drill of the present invention adopts a transmission shaft for transmission, and the power response is timely. At the same time, the friction inside the drill is effectively reduced, and the heat conduction and temperature rise of the drill are reduced. It can also operate efficiently in the case of long-term surgery.

[0031] 5. The bone drill of the present invention has a compact and distinct internal structure, each bearing is fixed by a sleeve, the internal structure is stable, and the service life is long. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of a chuck-type medical bone drill in an embodiment of the present invention;

[0033] Figure 2 is a cross-sectional view of a chuck-type medical bone drill in an embodiment of the present invention;

[0034] Figure 3 An exploded view of a chuck-type medical bone drill according to an embodiment of the present invention;

[0035] Figure 4 It is a schematic structural diagram of a conical chuck in a chuck-type medical bone drill according to an embodiment of the present invention;

[0036] Figure 5 It is a schematic structural diagram of a power output shaft in a chuck-type medical bone drill according to an embodiment of the present invention;

[0037] Figure 6 Schematic diagram of the structure of the power input shaft in the chuck-type medical bone drill in an embodiment of the present invention. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be further described below.

[0039] In this patent, the front end is the end close to the drill bit, and the rear end is the end close to the motor.

[0040] like Figure 1 , Figure 2 and Figure 3 As shown, the present invention provides a chuck-type medical bone drill. In order to facilitate holding the bone drill, the whole bone drill is a pen-shaped structure. The bone drill shell includes a lock head 1, a front sleeve 2, a front shell 3, a rear shell 4 and a rear shell 5 which are coaxially connected in sequence from head to tail. The lock head 1, the front sleeve 2, the front shell 3 and the rear shell 4 are screwed together by threads, as shown in FIG. Figure 2 As shown, the rear end shell 5 and the rear shell 4 are fastened together by two "L"-shaped overlaps that cooperate with each other, and a certain movable gap is reserved between the two "L"-shaped overlaps, that is, by pulling or pressing the rear shell 4, the rear shell 4 can achieve axial displacement relative to the rear end shell 5, and the displacement distance is the size of the movable gap.

[0041] In this embodiment, if Figure 2 and Figure 3 As shown, the internal parts are arranged concentrically with the transmission shaft 8 as the axis; the head end of the bone drill is detachably connected to the drill bit through the conical chuck 7; the bone drill is provided with a locking block 6 that is locked with the conical chuck 7 through a conical surface; Figure 4 As shown, in this embodiment, the tapered chuck 7 is a two-claw locking chuck. Since the inner surface of the locking block 6 is provided with a conical surface with the same inclination as the outer surface of the tapered chuck 7, the axial displacement of the tapered chuck 7 is driven to adjust the relative position of the tapered chuck 7 in the locking block 6, and the opening and closing of the two jaws are realized by utilizing the cooperation between the conical surfaces, thereby realizing the fixing and loosening of the grinding drill.

[0042] In this embodiment, the locking block 6 and the tapered chuck 7 are located inside the front end sleeve 2; a first bearing 10 is installed between the transmission shaft 8 and the inner wall of the front end sleeve 2; a sleeve cover plate 9 is installed between the first bearing 10 and the tail of the locking block 6, and the sleeve cover plate 9 fixes the first bearing 10 to ensure the stability of the rotation of the front end part of the transmission shaft 8.

[0043] In this embodiment, a waist-shaped hole is provided in the side wall of the rear housing 4 along the axial direction, and a button 15 is covered on the waist-shaped hole. The button 15 is fixed to the movable bearing seat 13 by a bolt 14. The length of the waist-shaped hole is the axial movable distance of the tapered chuck 7. The movable bearing seat 13 is sleeved on the transmission shaft 8, and a second bearing 12 is provided between the head end of the movable bearing seat 13 and the transmission shaft 8. After the bearing seat cap 11 is screwed on the head end of the movable bearing seat 13, the second bearing 12 is fixed; a third bearing 16 is provided between the tail end of the movable bearing seat 13 and the transmission shaft 8, and after the tail shaft nut 17 is screwed on the position close to the tail end of the transmission shaft 8, the third bearing 16 is fixed. Specifically, when the drill bit needs to be clamped, it is only necessary to push the movable bearing seat 13 forward through the button 15. The movable bearing seat 13 drives the transmission shaft 8 and the tapered chuck 7 to move forward together, and the cooperation between the tapered chuck 7 and the conical surface of the locking block 6 is utilized to realize the closure between the two melons, thereby achieving the fixation of the drill bit; similarly, if the drill bit needs to be loosened, it is only necessary to move the button 15 in the reverse direction.

[0044] In this embodiment, the rear end of the transmission shaft 8 is connected to a power input mechanism; the power input mechanism includes a power input shaft 26, a power output shaft 18, a sleeve 24, a pin 25 and a bearing sleeve 23; the power input shaft 26 is disposed in the rear end housing 5, and the rear end of the power input shaft 26 is connected to the drive mechanism shaft, such as Figure 6 As shown, the side wall of the front end of the power input shaft 26 is provided with a long strip-shaped slot, such as Figure 5As shown, a pin hole is provided at the tail end of the power output shaft 18. After the tail end of the power output shaft 18 is plugged into the head end of the power input shaft 26, the connection is achieved by plugging the column pin 25 into the slot and the pin hole. The sleeve 24 is sleeved on the power output shaft 18 and the connecting end of the power output shaft 18 to fix the column pin 25. At the same time, due to the Figure 6 The setting of the long strip groove shown, combined with the previously described fixing of the rear end shell 5 and the rear shell 4 by two mutually cooperating "L"-shaped overlaps, reserves a certain movable gap between the two "L"-shaped overlaps, that is, by pulling or pressing the rear shell 4, the rear shell 4 and the power input shaft 26 can achieve axial displacement, thereby adapting to drive motors of various specifications.

[0045] The front half of the power output shaft 18 is located in the rear housing 4, and the fourth bearing 19 and the fifth bearing 21 are installed behind the power output shaft 18 and the inner wall of the rear housing 4; the first retaining ring 20 is installed between the fourth bearing 19 and the fifth bearing 21; the head end of the power output shaft 18 is stepped, and the axial surface of the bearing sleeve 23 is a matching stepped axial surface. After the bearing sleeve 23 is fixed to the head end of the power output shaft 18, the fourth bearing 19 and the fifth bearing 21 are pressed between the limiting protrusions inside the rear housing 4; a wire retaining ring 22 is provided between the inner ring of the stepped axial surface of the bearing sleeve 23 and the end of the power output shaft 18. When the driving mechanism drives the power input shaft 26, the power output shaft 18, the transmission shaft 8 and the tapered chuck 7 to rotate synchronously, the first bearing 10, the second bearing 12, the third bearing 16, the fourth bearing 19 and the fifth bearing 21 fully play the purpose of lubrication, reducing friction and reducing heat, and providing sufficient stability for the operation of the equipment.

[0046] In this embodiment, if Figure 2 As shown, the tail end of the transmission shaft 8 is a "I"-shaped plug rod. Figure 5 The head end of the power output shaft 18 is a "I"-shaped slot. When the insertion rod is inserted into the slot, the insertion rod can be pulled relative to the slot without being disengaged.

[0047] The above is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any technician in the relevant technical field, without departing from the scope of the technical solution of the present invention, makes any form of equivalent replacement or modification to the technical solution and technical content disclosed in the present invention, which does not depart from the content of the technical solution of the present invention and still falls within the protection scope of the present invention.

Claims

1. A chuck-type medical bone drill, the bone drill being a pen-shaped structure, wherein the internal parts are arranged concentrically with the transmission shaft (8) as the axis; characterized in that: The head end of the bone drill is detachably connected to the drill bit via a conical chuck (7); a locking block (6) is provided inside the bone drill and is locked with the conical chuck (7) via a conical surface. The tail end of the conical chuck (7) is connected to the transmission shaft (8), and the shaft body of the transmission shaft (8) is connected to the button (15) on the side of the bone drill through a bearing mechanism. Pushing the button (15) links the conical chuck (7) to move forward and backward to achieve opening and closing locking.

2. The chuck-type medical bone drill according to claim 1, characterized in that: The bone drill housing comprises a locking head (1), a front sleeve (2), a front shell (3), a rear shell (4) and a rear shell (5) which are coaxially connected in sequence end to end.

3. The chuck-type medical bone drill according to claim 1, characterized in that: The inner surface of the locking block (6) is provided with a conical surface with the same inclination as the outer surface of the conical chuck (7); by adjusting the relative position of the conical chuck (7) in the locking block (6), the opening and closing of the clamping part of the conical chuck (7) is achieved by utilizing the cooperation between the conical surfaces.

4. The chuck-type medical bone drill according to claim 2, characterized in that: The locking block (6) and the tapered chuck (7) are located inside the front end sleeve (2); a first bearing (10) is installed between the transmission shaft (8) and the inner wall of the front end sleeve (2); and a protective cover plate (9) is installed between the first bearing (10) and the tail of the locking block (6).

5. The chuck-type medical bone drill according to claim 2, characterized in that: The bearing mechanism comprises a movable bearing seat (13), a bearing seat cap (11), a tail shaft nut (17), a second bearing (12) and a third bearing (16); The movable bearing seat (13) is sleeved on the transmission shaft (8), a second bearing (12) is provided between the head end of the movable bearing seat (13) and the transmission shaft (8), and the bearing seat cap (11) is screwed onto the head end of the movable bearing seat (13) to fix the second bearing (12); A third bearing (16) is provided between the rear end of the movable bearing seat (13) and the transmission shaft (8), and the rear shaft nut (17) is screwed onto a position of the transmission shaft (8) close to the rear end to fix the third bearing (16).

6. The chuck-type medical bone drill according to claim 5, characterized in that: The side wall of the rear housing (4) is provided with a waist-shaped hole along the axial direction, the button (15) is covered on the waist-shaped hole, and the button (15) is fixed to the movable bearing seat (13) by a bolt (14).

7. The chuck-type medical bone drill according to claim 6, characterized in that: The length of the waist-shaped hole is the axial movable distance of the tapered chuck (7).

8. The chuck-type medical bone drill according to claim 2, characterized in that: The rear end of the transmission shaft (8) is connected to a power input mechanism; The power input mechanism comprises a power input shaft (26), a power output shaft (18), a sleeve (24), a pin (25) and a bearing sleeve (23); The power input shaft (26) is arranged in the rear end housing (5), the rear end of the power input shaft (26) is connected to the drive mechanism shaft, the side wall of the front end of the power input shaft (26) is provided with a long strip-shaped slot, and the rear end of the power output shaft (18) is provided with a pin hole. After the rear end of the power output shaft (18) is plugged into the front end of the power input shaft (26), the connection is achieved by plugging the column pin (25) into the slot and the pin hole, and the sleeve (24) is sleeved on the power output shaft (18) and the connecting end of the power output shaft (18) to fix the column pin (25); The front half of the power output shaft (18) is located in the rear housing (4); a fourth bearing (19) and a fifth bearing (21) are installed between the power output shaft (18) and the inner wall of the rear housing (4); a first retaining ring (20) is installed between the fourth bearing (19) and the fifth bearing (21); The head end of the power output shaft (18) is stepped, and the axial surface of the bearing sleeve (23) is a matching stepped axial surface. After the bearing sleeve (23) is fixed to the head end of the power output shaft (18), the fourth bearing (19) and the fifth bearing (21) are pressed between the limiting protrusions inside the rear housing (4); A steel wire retaining ring (22) is provided between the inner ring of the stepped axial surface of the bearing sleeve (23) and the end of the power output shaft (18).

9. The chuck-type medical bone drill according to claim 8, characterized in that: The rear shell (4) and the rear end shell (5) are fastened and fixed by two mutually matching "L"-shaped overlaps, and a certain movable gap is reserved between the two "L"-shaped overlaps, and the movable gap is the same as the length of the long strip notch.

10. The chuck-type medical bone drill according to claim 8, characterized in that: The rear end of the transmission shaft (8) is a "I"-shaped insertion rod, and the front end of the power output shaft (18) is a "I"-shaped slot. When the insertion rod is inserted into the slot, the insertion rod can be pulled relative to the slot without being disengaged.

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