Abrasive drill with sheath
By designing a structure and fluid channels that gradually expand outward on the outer surface of the sheath, the problem of existing spinal mortar sheaths being unable to effectively isolate tissue has been solved, enabling safer and more efficient orthopedic surgical procedures.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU BONSS MEDICAL TECH
- Filing Date
- 2024-12-27
- Publication Date
- 2026-04-10
AI Technical Summary
Existing spinal grinding head sheaths cannot effectively isolate normal tissues and nerves, leading to frequent damage to normal tissues during the grinding process.
A protective sheath was designed with its outer surface gradually expanding outward along the axial and radial directions of the tool holder assembly, including a first curvature section and a second curvature section. The second curvature section covers the top of the grinding head and provides a fluid channel between the inner and outer tool holders, enhancing the protection of normal tissues and reducing vibration through positioning plates.
It effectively isolates normal tissue, reduces damage, increases the surgical field, reduces the number of times doctors need to change tools, shortens surgical time, and improves surgical safety and efficiency.
Smart Images
Figure CN224099409U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to medical instrument technical field, concretely relates to a drill with sheath. BACKGROUND
[0002] In orthopedic surgery, medical drills are often used to remove the bone tissue of patients. Taking spine-related surgery as an example, a typical spine drill device is composed of a grinding head, a locking device and a power handle, wherein the grinding head and the power handle are connected and locked through the locking device, and during the surgery, the drill is driven by the power handle to grind the spine-related tissue.
[0003] At present, in order to avoid damaging normal tissue during grinding, a sheath is arranged at the grinding head to isolate normal tissue. However, in spine surgery, the internal tissues and nerves of the spine are relatively rich, and the current grinding head sheath is a straight cylinder parallel to the axis of the grinding head, which cannot effectively isolate normal tissues and nerves, resulting in the damage of normal tissues during the grinding of bone tissue. SUMMARY
[0004] In order to solve the above technical problems, the utility model provides a drill with sheath.
[0005] The technical scheme for solving the above technical problems is as follows: a drill with sheath, comprising a tool holder, a tool rod assembly arranged on the tool holder, a grinding head arranged at the end of the tool rod assembly, and a sheath arranged at the end of the tool rod assembly and covering the grinding head, and the outer surface of the sheath gradually expands from back to front along the axial direction and radial direction of the tool rod assembly.
[0006] The sheath comprises a first curvature section, a second curvature section and a longitudinal plane on both sides of the second curvature section, the second curvature section covers the grinding head, and the curvature of the second curvature section is greater than that of the first curvature section.
[0007] Further, the inside of the tool rod assembly is provided with a connecting rod, and the grinding head is connected to the end of the connecting rod.
[0008] Further, a stop ring is arranged between the end of the tool rod assembly and the grinding head.
[0009] Further, the tool rod assembly comprises a connecting rod support, an inner tool rod and an outer tool rod arranged in sequence from inside to outside around the connecting rod, and the inner tool rod and the outer tool rod have a gap therebetween, which is configured as a fluid channel for liquid flow.
[0010] Further, a positioning sheet is arranged between the inner tool rod and the outer tool rod, and the positioning sheet is close to the grinding head, and the inner tool rod and the outer tool rod are limited by the positioning sheet.
[0011] Further, the positioning sheet is a half-pipe-shaped spring sheet structure.
[0012] The utility model has the advantages that the grinding drill with the sheath provided by the utility model is provided with the sheath which gradually expands outward along the radial direction and the axial direction, compared with the existing straight cylindrical sheath, can more effectively isolate normal tissues and avoid damaging normal tissues, in addition, the sheath can be used to peel part of tissues to increase the surgical field after cutting, which is convenient for doctors to observe and operate next, since the operation of taking out the grinding drill and using tools to push open and observe in the original operation process is avoided, the number of times of replacing tools by doctors can be reduced, and the operation time is reduced. BRIEF DESCRIPTION OF DRAWINGS
[0013] Fig. 1 It is a structural schematic diagram of the utility model;
[0014] Fig. 2 It is a sheath structure schematic diagram in the utility model;
[0015] Fig. 3 It is an internal structure schematic diagram of the utility model;
[0016] Figs. 1-3 The reference signs shown in the figure respectively represent: 1-shaft, 2-shaft assembly, 3-grinding head, 4-sheath, 40-first curvature section, 41-second curvature section, 42-longitudinal plane, 5-connecting rod, 6-stop ring, 20-connecting rod support, 21-inner shaft, 22-outer shaft, 23-positioning piece. DETAILED DESCRIPTION
[0017] The principles and characteristics of the utility model are described below in combination with the drawings, and the examples are only used to explain the utility model and not used to limit the scope of the utility model.
[0018] As Figs. 1-3 shown, a grinding drill with a sheath comprises a shaft 1, a shaft assembly 2 arranged on the shaft 1, a grinding head 3 arranged at the end of the shaft assembly 2, and a sheath 4 arranged at the end of the shaft assembly 2 and covering the grinding head 3, and the outer surface of the sheath 4 gradually expands outward from back to front along the axial direction and the radial direction of the shaft assembly 2. The grinding head 3 and the shaft assembly 2 are fixed in the shaft 1, before the operation, the shaft 1 is connected with a power handle, and the two are locked through a locking device, and the power handle provides the power required for the grinding head 3 in the operation. A stop ring 6 is arranged between the end of the shaft assembly 2 and the grinding head 3 to prevent the grinding head 3 from falling into the human body. When the grinding head 3 grinds the target bone tissue, the sheath 4 can effectively push the normal tissues outward, avoid damaging the normal tissues to a greater extent, ensure the surgical field, make the operation proceed smoothly, and reduce the pain of the patient.
[0019] The protective sheath 4 includes a first curvature section 40, a second curvature section 41, and longitudinal planes 42 located on both sides of the second curvature section 41. The second curvature section 41 covers the grinding head 3, and the curvature of the second curvature section 41 is greater than that of the first curvature section 40, so as to more effectively isolate the normal tissue near the grinding head 3. Specifically, the first curvature section 40 is the front end part of the protective sheath 4, which generally has a smaller curvature, is used to gradually guide the protective sheath 4 into the surgical area, and preliminarily isolates the normal tissue near the grinding head 3, so as to reduce the resistance when the protective sheath 4 enters the surgical area, while providing a certain protection effect, and prepares for the subsequent grinding operation. The second curvature section 41 is the main part of the protective sheath 4, which covers the grinding head 3 and has a greater curvature than the first curvature section 40. This design aims to more effectively isolate the normal tissue near the grinding head 3, preventing the debris and heat generated during grinding from causing damage to the normal tissue. The second curvature section 41 can more closely fit between the grinding head 3 and the surrounding tissue, forming an effective protective barrier. This not only improves the safety of the operation, but also ensures the accuracy and efficiency of the grinding operation.
[0020] The longitudinal planes 42 are located on both sides of the second curvature section 41, which is used to avoid the situation that the outer diameter of the grinding drill is too large to enter the instrument channel. By reducing the size of the protective sheath 4 in the radial direction, the longitudinal planes 42 enable the grinding drill to smoothly pass through the narrow surgical channel and reach the target area. The presence of the longitudinal planes 42 enables the protective sheath 4 to have a smaller outer diameter size while maintaining sufficient protection effect. This increases the applicability and flexibility of the grinding drill in surgery, enabling the doctor to operate in more complex surgical environments.
[0021] The inside of the cutter bar assembly 2 is provided with a connecting rod 5, and the grinding head 3 is connected to the end of the connecting rod 5. The connecting rod 5 transmits power to the grinding head 3. The cutter bar assembly 2 includes a connecting rod support 20, an inner cutter bar 21, and an outer cutter bar 22 arranged in sequence from inside to outside around the connecting rod 5. There is a gap between the inner cutter bar 21 and the outer cutter bar 22, which is configured as a fluid channel for liquid flow, for providing irrigation water to the surgical site during the operation. The connecting rod support 20 is arranged around the outside of the connecting rod 5 to provide necessary support and protection. The connecting rod support 20 enhances the overall stability of the cutter bar assembly 2, preventing the connecting rod 5 from bending or breaking during the operation, thereby ensuring the normal work of the grinding head 3.
[0022] A positioning piece 23 is arranged between the inner cutter bar 21 and the outer cutter bar 22, and the positioning piece 23 is a half-pipe shaped spring piece structure. The positioning piece 23 is located close to the grinding head 3, and limits the inner cutter bar 21 and the outer cutter bar 22 through the positioning piece 23, preventing large vibrations caused by cutter bar bouncing, ensuring the safety of the operation. During the operation, medical water flows out from the area of the fluid channel head that is not blocked by the positioning piece 23.
[0023] The above merely is the preferred embodiment of the present application, and does not limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A sheathed abrasive burr, comprising: The tool holder (1), the tool bar assembly (2) arranged on the tool holder (1), the grinding head (3) arranged at the end of the tool bar assembly (2), and the sheath (4) arranged at the end of the tool bar assembly (2) and covering the grinding head (3), and the outer surface of the sheath (4) gradually expands from back to front along the axial direction and the radial direction of the tool bar assembly (2); The sheath (4) comprises a first curvature section (40), a second curvature section (41), and a longitudinal plane (42) located on both sides of the second curvature section (41), the second curvature section (41) covers the grinding head (3), and the curvature of the second curvature section (41) is greater than that of the first curvature section (40).
2. The bur with a sheath according to claim 1, wherein The inside of the tool bar assembly (2) is provided with a connecting rod (5), and the grinding head (3) is connected to the end of the connecting rod (5).
3. The bur with a sheath according to claim 2, wherein A stop ring (6) is arranged between the end of the tool bar assembly (2) and the grinding head (3).
4. The bur with a sheath according to claim 2, wherein The tool bar assembly (2) comprises a connecting rod support (20), an inner tool bar (21), and an outer tool bar (22) arranged in sequence from inside to outside around the connecting rod (5), and the inner tool bar (21) and the outer tool bar (22) have a gap therebetween, which is configured as a fluid channel for liquid flow.
5. The bur with a sheath according to claim 4, wherein A positioning piece (23) is arranged between the inner tool bar (21) and the outer tool bar (22), and the positioning piece (23) is located close to the grinding head (3), and the inner tool bar (21) and the outer tool bar (22) are limited by the positioning piece (23).
6. The bur with a sheath according to claim 5, wherein The positioning piece (23) is a half-tubular spring structure.