CN217244636U - Depth limiting device and bone drill - Google Patents

Abstract

The utility model relates to a limit for depth device and bone drill. The depth limiting device comprises an inner sleeve and an outer sleeve, wherein one end of the inner sleeve is connected in the outer sleeve in a threaded manner, and the other end of the inner sleeve extends out of the outer sleeve; the outer sleeve and the inner sleeve are used for enabling a drill rod to pass through, one end, extending out of the outer sleeve, of the inner sleeve is used for facing a drill rod mounting portion, and the outer sleeve is used for being fixed relative to a bone to be drilled of a patient in the drilling process. The depth limiting device and the bone drill are convenient for adjusting the maximum drilling depth (namely the target drilling depth) which can be achieved by the drill rod in real time in the drilling process.

Description

Depth limiting device and bone drill

Technical Field

The utility model relates to the technical field of medical equipment, especially, relate to depth-limiting device and bone drill.

Background

In neurosurgical craniotomy, a burr is drilled into a patient's skull using a bone drill to create a treatment tunnel. During the drilling process, doctors usually judge whether the drilling depth is suitable or not by experience, and the judgment result is not reliable. If the drilling depth is insufficient, the treatment channel cannot be effectively established, and if the drilling depth is too deep, brain tissue damage is easily caused.

For this reason, some current bone drills are provided with depth limiting means for limiting the maximum drilling depth of the bone drill. The depth limiting device is adjusted in advance before drilling, the limited maximum drilling depth of the depth limiting device is equal to the target drilling depth expected by the operation, so that the actual drilling depth can be accurately controlled to reach the target drilling depth as long as the actual drilling depth of the bone drill is controlled to reach the maximum drilling depth, and the problem caused by insufficient or overlarge drilling depth can be prevented.

In the drilling process, doctors sometimes need to adjust the target drilling depth in real time according to the progress of the operation, and correspondingly, the depth limiting device needs to be adjusted in real time so as to adjust the maximum drilling depth limited by the depth limiting device in real time. However, the current depth stop device is easy to rotate along with the drill rod of the bone drill during the drilling process, so that the maximum drilling depth of the bone drill is inconvenient to adjust in real time during the drilling process.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is desirable to provide a depth stop device and an ultrasonic surgical instrument, which are not prone to failure, in view of the problem that the current depth stop devices are prone to failure.

One end of the inner sleeve is connected in the outer sleeve in a threaded mode, and the other end of the inner sleeve extends out of the outer sleeve; the outer sleeve and the inner sleeve are used for enabling a drill rod to pass through, one end, extending out of the outer sleeve, of the inner sleeve is used for facing a drill rod mounting portion, and the outer sleeve is used for being fixed relative to a bone to be drilled of a patient in the drilling process.

In an embodiment, the depth limiting device further includes an elastic member, and two ends of the elastic member in the axial direction of the outer sleeve are respectively abutted with the outer sleeve and the inner sleeve.

In an embodiment, a first hole and a second hole are formed in the outer sleeve, a first step surface is formed at a joint of a hole wall of the first hole and a hole wall of the second hole, the elastic member is located in a first direction of the inner sleeve, one end, away from the inner sleeve, of the elastic member abuts against the first step surface, and the first direction is a direction in which the inner sleeve is screwed into the outer sleeve.

In an embodiment, the resilient member is located in the first bore and the second bore is adapted to fit the drill rod.

In an embodiment, the inner sleeve includes a limiting section and a main body section which are distributed and connected along an axial direction, the main body section is located in a second direction of the limiting section, a first shoulder is formed at a joint of the limiting section and the main body section, the first shoulder faces the second direction, and the second direction is a direction in which the inner sleeve is screwed out of the outer sleeve; the depth limiting device further comprises a blocking piece arranged on the outer sleeve, and the blocking piece is located in the second direction of the first shaft shoulder and opposite to the first shaft shoulder.

In one embodiment, the blocking member is an arc-shaped structure, an opening is formed between two ends of the arc-shaped structure along the circumferential direction, and the opening is used for allowing the main body segment to pass through so that the arc-shaped structure surrounds the main body segment.

In one embodiment, the stop is threaded into the outer sleeve.

In an embodiment, a first hole and a third hole are arranged in the outer sleeve, the inner diameter of the third hole is larger than that of the first hole, a second step surface is formed at the joint of the hole wall of the third hole and the hole wall of the first hole, the second step surface faces a second direction, and the second direction is the direction in which the inner sleeve is screwed out of the outer sleeve; the inner sleeve comprises a threaded section and a limiting section which are distributed and connected along the axial direction, a second shaft shoulder is formed at the joint of the threaded section and the limiting section, the threaded section is in threaded connection with the hole wall of the first hole, and the second shaft shoulder is opposite to the second step surface.

In an embodiment, the inner sleeve includes a main body section and a protruding section distributed and connected in an axial direction, an outer diameter of the protruding section is larger than that of the main body section, the protruding section is located at an end portion of the inner sleeve along a second direction, and the second direction is a direction in which the inner sleeve is screwed out of the outer sleeve.

An embodiment of the application provides a bone drill, including drilling rod and above-mentioned arbitrary deep device, the drilling rod installation department is followed radial protrusion in the drilling rod, the drilling rod passes the inner skleeve with the outer sleeve, the inner skleeve stretches out the one end orientation of outer sleeve the drilling rod installation department.

According to the depth limiting device and the bone drill, in the drilling process of the bone drill, a doctor needs to adjust the target drilling depth in real time according to the progress condition of an operation. Because the outer sleeve and the bone to be drilled of the patient are relatively fixed in the drilling process, and one end of the inner sleeve is in threaded connection with the inner sleeve, the outer sleeve and the inner sleeve are not easy to rotate along with the drill rod in the drilling process, so that a doctor can adjust the maximum drilling depth (namely the target drilling depth) which can be reached by the drill rod in real time in the drilling process by rotating the inner sleeve to change the position of the inner sleeve along the axial direction of the outer sleeve (namely the feeding direction of the drill rod) in the drilling process.

Drawings

FIG. 1 is a schematic structural diagram of a depth stop device according to an embodiment;

fig. 2 is a schematic structural view of the depth stop device in fig. 1 applied to a bone drill.

The reference numbers illustrate:

a bone drill 10; a drill rod 11; a drill rod mounting section 12; mounting holes 12 a;

a depth stop device 100;

an inner sleeve 110; a threaded segment 111; a spacing section 112; a main body section 113; a protruding section 114; a first shoulder 110 a; a second shoulder 110 b;

an outer sleeve 120; a first hole 101; a second hole 102; a third aperture 103; a first step surface 120 a; a second step surface 120 b;

an elastic member 130;

a blocking member 140.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and for simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the present disclosure, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may directly abut the first and second features, or the first and second features may indirectly abut via an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are for purposes of illustration only and do not denote a single embodiment.

Referring to fig. 1, an embodiment of the present application provides a depth stop device 100. Referring again to fig. 2, the depth stop device 100 is applied to a bone drill 10. The bone drill 10 includes a drive assembly (not shown) and a drill rod 11. One end of the drill rod 11 is mounted to the drive assembly via the drill rod mounting portion 12 so that the drive assembly can drive the drill rod 11 to rotate to drill the other end of the drill rod 11 into a bone (not shown) to be drilled of a patient. The drill rod mounting portion 12 protrudes from the drill rod 11 in the radial direction of the drill rod 11.

As shown in fig. 2, in the present embodiment, the drill rod mounting portion 12 is integrally formed with the drill rod 11. The drill rod mounting section 12 has a mounting hole 12a, and the drill rod mounting section 12 is mounted to the drive assembly through the mounting hole 12 a.

In other embodiments, the drill rod mounting portion may be other structures known in the art. The drill rod mounting portion may also be integrally formed with the output end of the drive assembly, or the drill rod mounting portion may be separately formed. As long as the drill rod mounting section can mount the drill rod to the drive assembly.

Depth stop device 100 includes an inner sleeve 110 and an outer sleeve 120. One end of the inner sleeve 110 is threaded into the outer sleeve 120 and the other end extends out of the outer sleeve 120. As shown in FIG. 2, when the depth stop device 100 is applied to the bone drill 10, the drill rod 11 passes through the outer sleeve 120 and the inner sleeve 110. The end of the inner sleeve 110 that extends beyond the outer sleeve 120 faces the pipe mounting section 12.

When drilling a hole to be drilled in a patient using the bone drill 10 in a surgery, the outer sleeve 120 is fixed relative to the bone (not shown) to be drilled in the patient by hand or by means of a fixing tool, and the drill rod 11 is driven to rotate by the driving assembly and is axially advanced along the outer sleeve 120 and the inner sleeve 110 so as to drill the hole to be drilled in the patient. Since the drill rod mounting portion 12 protrudes from the drill rod in the radial direction of the drill rod 11, when the drill rod 11 is fed to the drill rod mounting portion 12 to the end of the inner sleeve 110 protruding from the outer sleeve 120, the end of the inner sleeve 110 protruding from the outer sleeve 120 blocks the drill rod mounting portion 12, so that the drill rod 11 is prevented from being fed further, and at this time, the actual drilling depth of the drill rod 11 reaches the maximum drilling depth.

Since the outer sleeve 120 is fixed relative to a bone (not shown) to be drilled of a patient during drilling, one end of the inner sleeve 110 is threadedly coupled into the outer sleeve 120, and thus, by rotating the inner sleeve 110, the position of the inner sleeve 110 can be adjusted in the axial direction of the outer sleeve 120 (i.e., the feeding direction of the drill rod 11). The position of the inner sleeve 110 in the axial direction of the outer sleeve 120 (i.e., the feeding direction of the drill rod 11) may be adjusted according to a target drilling depth desired by the operation such that the maximum drilling depth that the drill rod 11 can reach is equal to the target drilling depth, so that the target drilling depth can be accurately reached as long as the actual drilling depth of the drill rod 11 reaches the maximum drilling depth, and thus, problems caused by insufficient or excessive drilling depth can be prevented.

In the depth limiting device 100, during the drilling process of the bone drill 10, a doctor needs to adjust the target drilling depth in real time according to the progress of the operation. Since the outer sleeve 120 is fixed relative to the bone (not shown) to be drilled of the patient during the drilling process, and one end of the inner sleeve 110 is threadedly connected into the outer sleeve 120, the outer sleeve 120 and the inner sleeve 110 are not easily rotated with the drill rod 11 during the drilling process, so that the doctor can adjust the maximum drilling depth (i.e., the target drilling depth) which can be achieved by the drill rod 11 in real time during the drilling process by rotating the inner sleeve 110 to change the position of the inner sleeve 110 along the axial direction of the outer sleeve 120 (i.e., the feeding direction of the drill rod 11) during the drilling process.

It should be noted that when the bone drill 10 is used in a craniotomy in neurosurgery, a bone to be drilled is the skull of a patient. The bone drill 10 may also be used in other orthopedic procedures, for example, in an internal fixation operation, the bone drill 10 may be used to drill a broken bone of a patient so as to fix the broken bone of the patient by a connector such as a screw.

Referring to fig. 1 and fig. 2, in an embodiment, the depth stop device 100 further includes an elastic member 130. Both ends of the elastic member 130 in the axial direction of the outer sleeve 120 abut against the outer sleeve 120 and the inner sleeve 110, respectively, so that the outer sleeve 120 and the inner sleeve 110 can indirectly abut against each other in the axial direction of the outer sleeve 120.

Because the outer sleeve 120 is fixed relative to the bone (not shown) to be drilled of a patient during drilling, the inner sleeve 110 and the outer sleeve 120 are indirectly abutted along the axial direction of the outer sleeve 120, and the abutting force between the inner sleeve 110 and the outer sleeve 120 forms resistance to rotation of the inner sleeve 110 relative to the outer sleeve 120, so that the inner sleeve 110 is not easy to rotate along with the drill rod 11 during drilling, and further the position of the inner sleeve 110 along the axial direction of the outer sleeve 120 can be ensured to be stable and unchanged as much as possible, that is, the maximum drilling depth defined by the depth limiting device 100 can be ensured to accurately accord with the target drilling depth as much as possible.

Referring to fig. 2, in an embodiment, the elastic member 130 is assembled inside the outer sleeve 120 and is not easily interfered by external substances.

For convenience of description, a first direction OX and a second direction OX 'are defined, wherein the first direction OX is a direction in which the inner sleeve 110 is screwed into the outer sleeve 120, and the second direction OX' is a direction in which the inner sleeve 110 is screwed out of the outer sleeve 120.

Referring to fig. 2, in an embodiment, the outer sleeve 120 is provided with a first hole 101 and a second hole 102 arranged along the axial direction and communicated with each other, and an inner diameter of the first hole 101 is larger than an inner diameter of the second hole 102, so that a first step surface 120a is formed at a connection position of a hole wall of the first hole 101 and a hole wall of the second hole 102. The first hole 101 is located in the second direction OX 'of the second hole 102, and thus, the first step surface 120a faces the second direction OX'. The elastic member 130 is located in the first direction OX of the inner sleeve 110 and located in the first hole 101, so that one end of the elastic member 130 abuts against the inner sleeve 110, and one end of the elastic member 130 away from the inner sleeve 110 abuts against the first stepped surface 120a, thereby achieving the purpose that the outer sleeve 120 abuts against the inner sleeve 110 indirectly along the axial direction of the outer sleeve 120.

When the depth stop device 100 is assembled, the elastic member 130 is first placed into the first hole 101 along the first direction OX, and then the inner sleeve 110 is screwed into the outer sleeve 120 along the first direction OX, so that the two ends of the elastic member 130 are respectively abutted to the first step surface 120a and the inner sleeve 110, and the assembly is facilitated. The elastic member 130 may be a coil spring, or may be an elastic sleeve, an elastic rod, or the like made of an elastic material.

Of course, the outer sleeve, the inner sleeve and the elastic member may be connected in other manners, which is not limited thereto.

Referring to fig. 2, in one embodiment, the second bore 102 is adapted to fit the drill rod 11. Since the outer sleeve 120 is fixed relative to the bone (not shown) to be drilled of the patient during the drilling process, the drill rod 11 is adapted to the second hole 102, so that the moving direction of the drill rod 11 during the feeding process is favorably stabilized along the axial direction of the second hole 102, and the perpendicularity of the hole drilled by the drill rod 11 is favorably ensured.

Referring to fig. 2, in an embodiment, the inner sleeve 110 includes a stopper section 112 and a main body section 113 distributed and connected along an axial direction, and the main body section 113 is located in the second direction OX' of the stopper section 112. The outer diameter of the position-limiting section 112 is larger than the outer diameter of the main body section 113, and a first shoulder 110a is formed at the connection position of the position-limiting section 112 and the main body section 113, and the first shoulder 110a faces the second direction OX'.

The depth limiting device 100 further comprises a stopper 140 disposed on the outer sleeve 120, wherein the stopper 140 is located in the second direction OX 'of the first shoulder 110a and is opposite to the first shoulder 110a, so that the stopper 140 can block the first shoulder 110a, prevent the inner sleeve 110 from moving towards the second direction OX' to cause the threaded engagement with the outer sleeve 120 to be released, and further ensure the assembly reliability of the inner sleeve 110 and the outer sleeve 120.

In one embodiment, the limiting section 112 and the main body section 113 may be integrally formed, thereby facilitating the manufacturing process.

Referring to fig. 1, in an embodiment, the blocking member 140 has an arc structure, an opening 141 is formed between two ends of the arc structure along the circumferential direction, and the opening 141 is used for allowing the main body segment 113 to pass through, so that the arc structure surrounds the main body segment 113. When the depth stop device 100 is assembled, the main body 113 enters the space surrounded by the arc-shaped structure through the opening 141, so that the arc-shaped structure surrounds the main body 113, and then the arc-shaped structure is fixed with the outer sleeve 120, thereby facilitating the assembly of the stop member 140.

In one embodiment, the stop 140 is threaded into the outer sleeve 120. Specifically, the outer wall of the blocking member 140 has an external thread that mates with an internal thread of the outer sleeve 120, facilitating assembly.

In other embodiments, the stop member may be attached to the outer sleeve by bonding, welding, or the like. The blocking member is not limited to an arc-shaped structure, such as a blocking block, a blocking ring, etc.

In another embodiment, the elastic element may also be disposed between the blocking element and the first shoulder, so that both ends of the elastic element are respectively abutted with the blocking element and the first shoulder, and the axial abutment of the inner sleeve and the outer sleeve along the outer sleeve can also be indirectly realized.

It will be appreciated that the deeper the inner sleeve 110 is screwed into the outer sleeve 120 in the first direction OX, the deeper the maximum drilling depth of the drill rod 11 defined by the depth stop 100. When the maximum drilling depth of the drill rod 11 defined by the depth limiter 100 is too deep due to an adjustment error during drilling of a skull of a patient, the actual drilling depth is too deep, and brain tissue of the patient is easily damaged.

Referring to FIG. 2, in one embodiment, the outer sleeve 120 has a first bore 101 and a third bore 103 in communication with each other. The third hole 103 is located in the second direction OX' of the first hole 101. The inner diameter of the third bore 103 is larger than the inner diameter of the first bore 101, a junction of the bore wall of the third bore 103 and the bore wall of the first bore 101 forms a second step face 120b, the second step face 120b facing the second direction OX'.

The inner sleeve 110 comprises a threaded section 111 and a limiting section 112 distributed and connected along the axial direction, and the limiting section 112 is located in the second direction OX' of the threaded section 111. The outer diameter of the stopper section 112 is larger than the outer diameter of the threaded section 111, so that a second shoulder 110b is formed at the connection between the threaded section 111 and the stopper section 112, and the second shoulder 110b faces the first direction OX.

Threaded section 111 is threadedly coupled to the wall of first bore 101 to effect threaded coupling of inner sleeve 110 to outer sleeve 120. The stopper section 112 is located in the third hole 103, so that the second shoulder 110b is opposite to the second step surface 120b, and the second step surface 120b can block the second shoulder 110b, thereby preventing the problem caused by the fact that the maximum drilling depth is too deep as the inner sleeve 110 is screwed into the inner sleeve 110 in the first direction OX too much.

In one embodiment, the limiting section and the thread section can be integrally formed, so that the processing is convenient.

In yet another embodiment, the outer sleeve has a first bore and a third bore in communication within the outer sleeve. The third hole is located in the second direction of the first hole. The inner diameter of the third hole is larger than that of the first hole, a second step surface is formed at the joint of the hole wall of the third hole and the hole wall of the first hole, and the second step surface faces the second direction. The inner sleeve also can threaded connection in the pore wall of third hole along the one end of first direction to, the inner sleeve is relative along the one end and the second step face of first direction, and then the second step face can block the one end of inner sleeve along first direction, prevents that the inner sleeve from leading to the fact the problem that the biggest drilling depth degree is too deep to bring along first direction screw in too much.

Referring to fig. 2, in an embodiment, the inner sleeve 110 includes a main body section 113 and a protruding section 114 distributed along the axial direction and connected to each other, and an outer diameter of the protruding section 114 is larger than that of the main body section 113, so that a cross-sectional area of the protruding section 114 is larger. The protruding section 114 is located in the second direction OX' of the main body section 113. The protruding section 114 is located at an end of the inner sleeve 110 in the second direction OX'. Since the cross-sectional area of the protruding section 114 is large and the protruding section 114 is located at the end of the inner sleeve 110 in the second direction OX', it is convenient to grip the protruding section 114 to rotate the inner sleeve 110.

Furthermore, since the protruding section 114 is located at the end of the inner sleeve 110 in the second direction OX', when the drill rod 11 is fed to the end of the drill rod mounting section 12 where the inner sleeve 110 protrudes out of the outer sleeve 120, i.e. the drill rod mounting section 12 reaches the protruding section 114, it is blocked by the protruding section 114, thereby preventing the drill rod 11 from being fed further. Due to the large cross-sectional area of the protruding section 114, the rod assembly mounting section 12 is easily blocked.

In one embodiment, the protruding section and the main body section can be integrally formed, thereby facilitating the processing.

In a further embodiment, the resilient member may also be fitted to the outside of the outer sleeve. For example, the elastic member may be disposed between the protruding section and one end of the outer sleeve in the second direction, so that both ends of the elastic member respectively abut against the protruding section and one end of the outer sleeve in the second direction, and the axial abutment of the inner sleeve and the outer sleeve in the second direction can also be indirectly achieved.

Referring to fig. 2, an embodiment of the present application further provides a bone drill 10. The bone drill 10 comprises a drill rod 11 and the depth stop device 100 of any one of the above items, wherein the drill rod mounting part 12 protrudes out of the drill rod 11 along the radial direction of the drill rod 11, the drill rod 11 passes through the inner sleeve 110 and the outer sleeve 120, and one end of the inner sleeve 110, which extends out of the outer sleeve 120, faces the drill rod mounting part 12.

During the drilling process of the bone drill 10, a doctor needs to adjust the target drilling depth in real time according to the progress of the operation. Since the outer sleeve 120 is fixed relative to the bone (not shown) to be drilled of the patient during the drilling process, and one end of the inner sleeve 110 is threadedly connected into the outer sleeve 120, the outer sleeve 120 and the inner sleeve 110 are not easily rotated with the drill rod 11 during the drilling process, so that the doctor can adjust the maximum drilling depth (i.e., the target drilling depth) which can be achieved by the drill rod 11 in real time during the drilling process by rotating the inner sleeve 110 to change the position of the inner sleeve 110 along the axial direction of the outer sleeve 120 (i.e., the feeding direction of the drill rod 11) during the drilling process.

In one embodiment, the bone drill 10 further includes a drive assembly to which one end of the drill rod 11 is mounted via the drill rod mounting portion 12.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent several embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. A depth stop device, comprising an inner sleeve (110) and an outer sleeve (120), wherein one end of the inner sleeve (110) is connected to the inner sleeve (120) in a threaded mode, and the other end of the inner sleeve extends out of the outer sleeve (120); the outer sleeve (120) and the inner sleeve (110) are used for enabling the drill rod (11) to pass through, and one end of the inner sleeve (110) extending out of the outer sleeve (120) is used for facing the drill rod mounting portion (12).

2. The depth stop device of claim 1, further comprising a resilient member (130), wherein both ends of the resilient member (130) in the axial direction of the outer sleeve (120) abut against the outer sleeve (120) and the inner sleeve (110), respectively.

3. The depth limiting device as claimed in claim 2, wherein a first hole (101) and a second hole (102) are formed in the outer sleeve (120), a first step surface (120a) is formed at a connection position of a hole wall of the first hole (101) and a hole wall of the second hole (102), the elastic member (130) is located in a first direction of the inner sleeve (110), one end of the elastic member (130) facing away from the inner sleeve (110) abuts against the first step surface (120a), and the first direction is a direction in which the inner sleeve (110) is screwed into the outer sleeve (120).

4. A depth stop according to claim 3, wherein the resilient member (130) is located within the first bore (101) and the second bore (102) is adapted to fit the drill rod (11).

5. The depth stop device according to claim 1, wherein the inner sleeve (110) comprises a stopper section (112) and a main body section (113) which are distributed and connected along the axial direction, the main body section (113) is located in a second direction of the stopper section (112), a first shoulder (110a) is formed at the joint of the stopper section (112) and the main body section (113), the first shoulder (110a) faces the second direction, and the second direction is a direction in which the inner sleeve (110) is screwed out of the outer sleeve (120); the depth stop further comprises a stop (140) disposed on the outer sleeve (120), the stop (140) being located in a second direction of the first shoulder (110a) and opposite the first shoulder (110 a).

6. The depth stop according to claim 5, wherein the blocking member (140) is an arc-shaped structure, an opening is formed between two ends of the arc-shaped structure along the circumferential direction, and the opening is used for enabling the main body segment (113) to pass through so that the arc-shaped structure surrounds the main body segment (113).

7. Depth stop according to claim 6 or 5, wherein the stop (140) is screwed into the outer sleeve (120).

8. The depth stop according to claim 1, wherein a first hole (101) and a third hole (103) are formed in the outer sleeve (120), the inner diameter of the third hole (103) is larger than that of the first hole (101), a second step surface (120b) is formed at the junction of the hole wall of the third hole (103) and the hole wall of the first hole (101), the second step surface (120b) faces a second direction, and the second direction is the direction in which the inner sleeve (110) is screwed out of the outer sleeve (120); the inner sleeve (110) comprises a threaded section (111) and a limiting section (112) which are distributed along the axial direction and connected, a second shaft shoulder (110b) is formed at the joint of the threaded section (111) and the limiting section (112), the threaded section (111) is in threaded connection with the hole wall of the first hole (101), and the second shaft shoulder (110b) is opposite to the second step surface (120 b).

9. The depth stop according to claim 1, wherein the inner sleeve (110) comprises a main body section (113) and a protruding section (114) distributed and connected in the axial direction, the protruding section (114) has a larger outer diameter than the main body section (113), the protruding section (114) is located at an end of the inner sleeve (110) in a second direction, and the second direction is a direction in which the inner sleeve (110) is screwed out of the outer sleeve (120).

10. A bone drill, characterized by comprising a drill rod (11) and the depth stop device as claimed in any one of claims 1 to 9, wherein the drill rod mounting portion (12) protrudes from the drill rod (11) in a radial direction of the drill rod (11), the drill rod (11) passes through the inner sleeve (110) and the outer sleeve (120), and one end of the inner sleeve (110) protruding out of the outer sleeve (120) faces the drill rod mounting portion (12).

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