A stereotactic skull drilling limiting drill rod
By designing a limit-type drilling mechanism and a limit adjustment mechanism, the problem of poor positioning accuracy caused by the axial movement of the limit sleeve during drilling was solved, and precise control of drilling depth and improved stability were achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HANGZHOU TRADITIONAL CHINESE MEDICINE HOSPITAL (HANGZHOU TRADITIONAL CHINESE MEDICINE HOSPITAL AFFILIATED TO ZHEJIANG UNIV OF TRADITIONAL CHINESE MEDICINE)
- Filing Date
- 2026-05-20
- Publication Date
- 2026-07-31
AI Technical Summary
In existing stereotactic EEG skull drilling devices, the threaded structure of the drill bit causes axial movement of the limiting sleeve due to high-speed rotation during drilling, resulting in poor positioning accuracy and stability.
A stereotactic cranial drilling limiting drill rod was designed, comprising a limiting drilling mechanism and a limiting adjustment mechanism. Through the cooperation of the limiting rotating rod, the driving limiting plate and the driven limiting plate, the drill rod is prevented from being displaced due to the rotation of the motor during drilling, and the drilling depth is adjusted by the threaded sleeve and the polygonal limiting rod.
It improves the control precision and operational stability of drilling, ensures the accuracy and safety of drilling depth, and avoids the risk of the drill bit breaking through the skull and entering the brain tissue.
Smart Images
Figure CN122478591A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of medical device technology, specifically to a stereotactic cranial drilling and positioning drill rod. Background Technology
[0002] For epileptogenic foci that are negative on deep brain imaging or other imaging studies, stereotactic electroencephalography (EEG) is required to implant multiple electrodes in the brain for precise three-dimensional localization, determining the location and conduction range of the epileptogenic focus within the epileptogenic network. A crucial step in the implantation of stereotactic EEG electrodes is drilling into the skull, which determines the direction and depth of electrode insertion. However, previous methods of controlling the drilling depth in the skull, relying on the surgeon's experience and tactile sense, have proven unreliable.
[0003] To this end, Chinese Patent Publication No. CN213345822U discloses a "Stereotactic Electroencephalography Skull Drilling Limiting Drill Rod," whose main structure includes a rod body. The front section of the rod body is a drill bit, and the tail section is a connecting rod for mounting on an electric drill. Its key feature is that an adjusting screw is provided between the drill bit and the connecting rod within the rod body. A limiting sleeve is threaded onto the adjusting screw. By rotating the limiting sleeve, the axial position of the limiting sleeve on the adjusting screw can be adjusted, thereby adjusting the limiting depth of the drill hole. The limiting sleeve works in conjunction with the drill rod clamping component to limit the drilling depth. This stereotactic EEG skull drilling limiting drill rod, during operation, first measures the skull thickness and sets the drilling depth accordingly. Specifically, the drilling depth should be set slightly less than the measured skull thickness. The axial position of the limiting sleeve is then adjusted based on the set drilling depth. When drilling the skull with a hand drill, the limiting sleeve abuts against the clamping component on the stereotactic instrument guide bow or the surgical robot arm to achieve limitation, thereby ensuring that the drill bit will not penetrate the skull and enter the brain tissue, preventing serious consequences.
[0004] The aforementioned stereotactic EEG skull drilling limiting drill rod has a threaded structure set around the rotating drill bit. Obviously, the drill bit is rotating at high speed during operation. This rotation will cause the threaded structure to be subjected to the same force. Therefore, it is easy to cause the limiting sleeve to move axially, resulting in poor positioning accuracy. Summary of the Invention
[0005] To address the shortcomings of existing technologies, this invention provides a stereotactic cranial drilling limiting drill rod. Without affecting the normal operation of the drill rod, it can control the depth to which the drill rod descends during drilling, thereby controlling the drilling depth. Furthermore, the device's positioning is independent of one side of the drill rod, preventing displacement due to motor rotation during drilling, thus improving control accuracy and operational stability, and solving the aforementioned technical problems.
[0006] To achieve the above objectives, the present invention provides the following technical solution: a stereotactic cranial drilling limiting drill rod, comprising a clamped component that can be fixedly connected to a clamping component on a stereotactic instrument guide bow or a surgical robot arm, and a limiting drilling mechanism, the structure of which includes a drill rod capable of drilling, a limiting rotating rod disposed at one end of the drill rod and capable of driving the drill rod to rotate, a driving limiting disk installed at the body of the limiting rotating rod and rotating with the limiting rotating rod, and a driven limiting disk capable of driving the movement of the driving limiting disk to generate a driven limiting; and a limiting adjustment mechanism, which internally comprises a first external thread rod and a second external thread rod capable of relative movement, a threaded sleeve capable of changing the distance between the first external thread rod and the second external thread rod, and a polygonal limiting rod capable of preventing the first external thread rod and the second external thread rod from rotating relative to each other.
[0007] Preferably, the limiting drilling mechanism further includes a first limiting plate integrally disposed at one end of the drill rod and a fixed sleeve sleeved around the limiting rotating rod. One end of the first limiting plate is provided with a limiting rotating rod integrally formed therewith, and one end of the limiting rotating rod is provided with a connecting flange integrally formed therewith. The limiting rotating rod is provided with a drive limiting plate integrally formed therewith on the outer periphery of the rod body near the connecting flange. The top sleeve hole of the fixed sleeve is mounted to the outer periphery of the bottom plate body of the driven limiting plate through a bearing. The center of the driven limiting plate is provided with a rod body through hole for the movement of the limiting rotating rod. One side of the fixed sleeve is provided with a driven connecting plate integrally formed therewith.
[0008] Preferably, during operation, the connecting flange is mated to the rotor end of a handheld electric drill.
[0009] Preferably, the structural radius of the perforation in the rod is adapted to the structural radius of the limiting rotating rod.
[0010] Preferably, the limiting adjustment mechanism further includes a first connecting plate and a second connecting plate. One end of the threaded sleeve is provided with a first internal thread cavity with a concave structure, and the other end of the threaded sleeve is provided with a second internal thread cavity with a concave structure. The rod body of the first external thread rod is installed inside the first internal thread cavity through the first thread structure, and the rod body of the second external thread rod is installed inside the second internal thread cavity through the second thread structure. The first and second external thread rods are provided with polygonal limiting cavities with concave structures at their opposite ends. A polygonal limiting rod inserted into the polygonal limiting cavity is fixedly installed at the center of the threaded sleeve. One end of the first external thread rod is provided with a first connecting plate that is integral with it and fixedly connected to the clamped part, and one end of the second external thread rod is provided with a second connecting plate that is integral with it and fixedly connected to the driven connecting plate.
[0011] Preferably, the cross-sectional shape of the polygonal limiting cavity is consistent with the cross-sectional shape of the polygonal limiting rod, both being polygonal structures, and the structural dimensions of the cross-sectional shape of the polygonal limiting cavity match the structural dimensions of the cross-sectional shape of the polygonal limiting rod.
[0012] Preferably, the first thread structure includes an internal thread structure disposed inside the first internal thread cavity and an external thread structure disposed on the first external thread rod body, and the second thread structure includes an internal thread structure disposed inside the second internal thread cavity and an external thread structure disposed on the second external thread rod body, and the helical direction of the first thread structure is opposite to the helical direction of the second thread structure.
[0013] Compared with the prior art, the present invention provides a stereotactic cranial drilling limiting drill rod, which has the following beneficial effects: Without affecting the normal operation of the drill rod, the device can control the depth to which the drill rod descends during drilling, thereby controlling the drilling depth. In addition, the device is positioned independently of one side of the drill rod, so it will not be displaced due to the rotation of the motor during drilling, thus improving its control accuracy and operational stability. Attached Figure Description
[0014] Figure 1 This is a perspective view of the present invention; Figure 2 This is a three-dimensional cross-sectional view of the present invention; Figure 3 This is a perspective view of the limiting drilling mechanism in this invention; Figure 4 This is a three-dimensional cross-sectional view of the limiting drilling mechanism in this invention; Figure 5 This is a perspective view of the limit adjustment mechanism in this invention; Figure 6 This is a three-dimensional cross-sectional view of the limit adjustment mechanism in this invention.
[0015] The components are as follows: 1. Clamped part; 2. Limiting drilling mechanism; 21. Drill rod; 22. First limiting plate; 23. Limiting rotating rod; 24. Connecting flange; 25. Driving limiting plate; 26. Driven limiting plate; 27. Rod body through hole; 28. Fixing sleeve; 29. Driven connecting plate; 3. Limiting adjustment mechanism; 31. Threaded sleeve; 32. First internal thread cavity; 33. Second internal thread cavity; 34. First thread structure; 35. Second thread structure; 36. First external thread rod; 37. Second external thread rod; 38. First connecting plate; 39. Second connecting plate; 310. Polygonal limiting cavity; 311. Polygonal limiting rod. Detailed Implementation
[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0017] Please see Figure 1 and Figure 2 A stereotactic skull drilling limiting drill rod includes a clamped part 1 that can be fixedly connected to a clamping part on the stereotactic instrument guide bow or the surgical robot arm. Before operation, the clamped part 1 needs to be fixedly connected to the clamping part on the stereotactic instrument guide bow or the surgical robot arm, and the drilling angle of the drill rod 21 needs to be adjusted so that the drill rod 21 can drill the required part of the patient. Then, the connecting flange 24 is connected to the rotor end of a handheld electric drill.
[0018] To implement the borehole depth limiting function, please refer to [link / reference]. Figure 1 , Figure 2 , Figure 3 and Figure 4 A limiting drilling mechanism 2 needs to be set up. Its structure includes a drill rod 21 capable of drilling, a limiting rotating rod 23 set at one end of the drill rod 21 and capable of driving the drill rod 21 to rotate, a driving limiting plate 25 installed at the rod body of the limiting rotating rod 23 and rotating with the limiting rotating rod 23, and a driven limiting plate 26 capable of driving the movement of the driving limiting plate 25 to a driven limiting. The doctor holds the electric drill and then starts the electric drill. The rotor will drive the limiting rotating rod 23, the driving limiting plate 25 and the drill rod 21 to rotate rapidly and slowly push the electric drill along the axial direction of the through hole 27 of the rod body. At this time, the drill rod 21 will drill a hole in the affected area. When the driving limiting plate 25 contacts the driven limiting plate 26, the driven limiting plate 26 will rotate accordingly, and the driving limiting plate 25 will prevent the drill rod 21 from moving down, that is, it will move along the axial direction of the rotating hole, thereby realizing the function of limiting the drilling depth.
[0019] For details regarding the specific structure of the limiting drilling mechanism 2, please refer to [link / reference]. Figure 3 and Figure 4It also includes a first limiting plate 22 integrally disposed at one end of the drill rod 21 and a fixed sleeve 28 sleeved around the limiting rotating rod 23. One end of the first limiting plate 22 is provided with a limiting rotating rod 23 integrally disposed therewith. One end of the limiting rotating rod 23 is provided with a connecting flange 24 integrally disposed therewith. The limiting rotating rod 23 is provided with a drive limiting plate 25 integrally disposed therewith on the outer periphery of the rod body near the connecting flange 24. The top sleeve hole of the fixed sleeve 28 is mounted to the outer periphery of the bottom plate of the driven limiting plate 26 through a bearing. The center of the driven limiting plate 26 is provided with a rod body through hole 27 for the movement of the limiting rotating rod 23. One side of the fixed sleeve 28 is provided with a driven connecting plate 29 integrally disposed therewith. During operation, the connecting flange 24 is connected to the rotor end of a handheld electric drill. The structural radius of the rod body through hole 27 is adapted to the structural radius of the limiting rotating rod 23.
[0020] To enable the adjustment of drilling depth, please refer to [link / reference]. Figure 1 , Figure 2 , Figure 5 and Figure 6 A limit adjustment mechanism 3 needs to be set up. Inside, there are a first external thread rod 36 and a second external thread rod 37 that can move relative to each other, a threaded sleeve 31 that can change the distance between the first external thread rod 36 and the second external thread rod 37, and a polygonal limit rod 311 that can prevent the first external thread rod 36 and the second external thread rod 37 from rotating relative to each other. The threaded sleeve 31 is rotated in a directional manner. Due to the threaded connection and the opposite threaded structure, and under the action of the polygonal limit rod 311, the distance between the first external thread rod 36 and the second external thread rod 37 will change, thereby controlling the longitudinal distance between the L-shaped fixed plate 29 and the horizontal hollow cabinet 21, thereby driving the distance between the limit plate 25 and the driven limit plate 26. This distance is the drilling depth, which can be adjusted to a suitable drilling depth according to actual needs.
[0021] For details regarding the specific structure of the limit adjustment mechanism 3, please refer to [link / reference]. Figure 5 and Figure 6It also includes a first connecting plate 38 and a second connecting plate 39. One end of the threaded sleeve 31 is provided with a first internal thread cavity 32 with a concave structure, and the other end of the threaded sleeve 31 is provided with a second internal thread cavity 33 with a concave structure. The rod body of the first external thread rod 36 is installed inside the first internal thread cavity 32 through a first thread structure 34, and the rod body of the second external thread rod 37 is installed inside the second internal thread cavity 33 through a second thread structure 35. The first external thread rod 36 and the second external thread rod 37 are provided with a polygonal limiting cavity 310 with a concave structure at their opposite ends. A polygonal limiting rod 311 is fixedly installed in the center of the threaded sleeve 31 and inserted into the polygonal limiting cavity 310. One end of the first external thread rod 36 is provided with a first connecting plate 38 that is integral with it and fixedly connected to the clamped part 1. One end of the second external thread rod 37 is provided with a second connecting plate 39, which is integral with it and fixedly connected to the driven connecting plate 29. The cross-sectional shape of the polygonal limiting cavity 310 is consistent with the cross-sectional shape of the polygonal limiting rod 311, both being polygonal structures. The cross-sectional dimensions of the polygonal limiting cavity 310 match the cross-sectional dimensions of the polygonal limiting rod 311. The first thread structure 34 includes an internal thread structure disposed inside the first internal thread cavity 32 and an external thread structure disposed on the rod body of the first external thread rod 36. The second thread structure 35 includes an internal thread structure disposed inside the second internal thread cavity 33 and an external thread structure disposed on the rod body of the second external thread rod 37. The helical direction of the first thread structure 34 is opposite to the helical direction of the second thread structure 35.
[0022] In use, the clamping part 1 needs to be fixedly connected to the clamping part on the stereotactic instrument guide bow or the surgical robot arm, and the drilling angle of the drill rod 21 needs to be adjusted so that the drill rod 21 can drill the required part of the patient. Then, the connecting flange 24 is connected to the rotor end of a handheld electric drill, and the threaded sleeve 31 is rotated in a directional manner. Due to the threaded connection and the opposite threaded structure, and under the action of the polygonal limiting rod 311, the distance between the first external thread rod 36 and the second external thread rod 37 will change, thereby controlling the longitudinal distance between the L-shaped fixing plate 29 and the horizontal hollow cabinet 21. The distance between the driving limit plate 25 and the driven limit plate 26 determines the drilling depth, which can be adjusted to a suitable drilling depth as needed. The doctor holds the electric drill and starts it. The rotor drives the limit rotating rod 23, the driving limit plate 25, and the drill rod 21 to rotate rapidly, slowly pushing the electric drill along the axis of the through hole 27. At this time, the drill rod 21 will drill a hole in the affected area. When the driving limit plate 25 contacts the driven limit plate 26, the driven limit plate 26 will rotate accordingly, while the driving limit plate 25 will prevent the drill rod 21 from moving down, that is, moving along the axis of the rotating hole, thus completing the drilling.
[0023] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A stereotactic skull drilling limiting drill rod, comprising a clamped piece (1) capable of being fixedly connected with a clamped piece on a stereotactic instrument guiding bow or a mechanical arm of a surgical robot, characterized in that: It also includes, The limiting drilling mechanism (2) includes a drill rod (21) capable of drilling, a limiting rotating rod (23) located at one end of the drill rod (21) and capable of driving the drill rod (21) to rotate, a driving limiting disk (25) installed on the rod body of the limiting rotating rod (23) and rotating with the limiting rotating rod (23), and a driven limiting disk (26) capable of driving the movement of the driving limiting disk (25) to be driven and limited. And a limit adjustment mechanism (3), which is provided with a first external thread rod (36) and a second external thread rod (37) that can move relative to each other, a threaded sleeve (31) that can change the distance between the first external thread rod (36) and the second external thread rod (37), and a polygonal limit rod (311) that can prevent the first external thread rod (36) and the second external thread rod (37) from rotating relative to each other.
2. A stereotactic cranial burr hole limiting drill rod as defined in claim 1, wherein: The limiting drilling mechanism (2) further includes a first limiting plate (22) integrally disposed at one end of the drill rod (21) and a fixed sleeve (28) sleeved around the limiting rotating rod (23). One end of the first limiting plate (22) is provided with a limiting rotating rod (23) integrally disposed therewith. One end of the limiting rotating rod (23) is provided with a connecting flange (24) integrally disposed therewith. The limiting rotating rod (23) is provided with a driving limiting plate (25) integrally disposed therewith near the connecting flange (24). The top sleeve hole of the fixed sleeve (28) is installed around the bottom plate of the driven limiting plate (26) through a bearing. The center of the driven limiting plate (26) is provided with a rod through hole (27) for the movement of the limiting rotating rod (23). One side of the fixed sleeve (28) is provided with a driven connecting plate (29) integrally disposed therewith.
3. The stereotactic skull drilling and positioning drill rod according to claim 2, characterized in that: During operation, the connecting flange (24) is connected to the rotor end of a handheld electric drill.
4. The stereotactic skull drilling and positioning drill rod according to claim 3, characterized in that: The structural radius of the rod through hole (27) is adapted to the structural radius of the limiting rotating rod (23).
5. The stereotactic skull drilling and positioning drill rod according to claim 4, characterized in that: The limiting adjustment mechanism (3) further includes a first connecting plate (38) and a second connecting plate (39). One end of the threaded sleeve (31) is provided with a first internal thread cavity (32) with an inward concave structure, and the other end of the threaded sleeve (31) is provided with a second internal thread cavity (33) with an inward concave structure. The rod body of the first external thread rod (36) is installed inside the first internal thread cavity (32) through the first thread structure (34), and the rod body of the second external thread rod (37) is installed inside the second internal thread cavity (33) through the second thread structure (35). The first external thread rod (36) and the second external thread rod (37) are provided with a concave polygonal limiting cavity (310) at their opposite ends. A polygonal limiting rod (311) inserted into the polygonal limiting cavity (310) is fixedly installed at the center of the threaded sleeve (31). One end of the first external thread rod (36) is provided with a first connecting plate (38) that is integral with it and fixedly connected to the clamped part (1). One end of the second external thread rod (37) is provided with a second connecting plate (39) that is integral with it and fixedly connected to the driven connecting plate (29).
6. The stereotactic skull drilling and positioning drill rod according to claim 5, characterized in that: The cross-sectional shape of the polygonal limiting cavity (310) is consistent with the cross-sectional shape of the polygonal limiting rod (311), both being polygonal structures, and the structural dimensions of the cross-section of the polygonal limiting cavity (310) match the structural dimensions of the cross-section of the polygonal limiting rod (311).
7. A stereotactic skull drilling and positioning drill rod according to claim 6, characterized in that: The first thread structure (34) includes an internal thread structure disposed inside the first internal thread cavity (32) and an external thread structure disposed on the first external thread rod (36). The second thread structure (35) includes an internal thread structure disposed inside the second internal thread cavity (33) and an external thread structure disposed on the second external thread rod (37). The helical direction of the first thread structure (34) is opposite to the helical direction of the second thread structure (35).