Intervertebral disc reamer

Abstract

The utility model relates to the technical field of medical equipment, and provides an intervertebral disc reamer which comprises a handle and a reamer body detachably connected with the handle. Wherein the handle is provided with a handheld end close to an operator and a fixed end far away from the operator, and a reamer fixing opening is formed in the fixed end; the reamer comprises a reamer rod detachably connected with the reamer fixing opening and a reamer head arranged at the end, away from the handle, of the reamer rod. Wherein the tool bit is a non-right-angle tool bit, and at least one cutting edge is arranged on the tool bit. The intervertebral disc reamer is more in line with the leaf profile of the upper and lower dome-shaped anatomical structure of the intervertebral space, on one hand, the intervertebral disc reamer is easier to enter the intervertebral space, and on the other hand, the intervertebral disc reamer is more in line with the dome-shaped structure with the lower periphery and the high center of the intervertebral space in the intervertebral space reaming process, so that the intervertebral disc reamer is higher in efficiency in the intervertebral space treatment process; the damage to the intervertebral space bony end plate is smaller; moreover, the reamer bar and the reamer head of the reamer are connected through the spherical hinge, so that the angle of the reamer head is convenient to adjust, and operation is easier.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments, in particular to an intervertebral disc reamer. Background Art

[0002] With the changes in modern lifestyles and work styles, the incidence of degenerative spinal diseases has increased year by year. The incidence of low back and leg pain caused by lumbar degeneration has increased year by year. Lumbar fusion surgery is the gold standard for treating degenerative spinal diseases such as lumbar disc herniation, lumbar spinal stenosis, or lumbar spondylolisthesis. During lumbar fusion surgery, an intervertebral disc reamer is an essential tool, mainly used for the treatment of the nucleus pulposus and cartilage endplates in the intervertebral space, and for the distraction of the intervertebral space. Good intervertebral space treatment not only helps to distract the intervertebral height, but is also crucial for later intervertebral fusion.

[0003] Currently, most existing disc reamers have rectangular heads, all with right-angled tips. However, the physiological structure of an intervertebral disc is a dome-shaped, elliptical cylinder with low perimeters and a high center. The disc is surrounded by a dense annulus fibrosus structure, with cartilage endplates above and below. The anterior-posterior height of the intervertebral space is lower than the central dome-shaped structure, and intervertebral space treatment primarily focuses on the central nucleus pulposus and the upper and lower cartilage endplates. When a right-angled reamer penetrates the front of the disc, the front and back of the reamer are supported by the lower front and back of the disc, resulting in inadequate treatment of the central dome. These upper and lower endplates are precisely the most critical areas for intervertebral fusion and deserve special attention. Furthermore, the front of the right-angled reamer can easily damage the bony endplates in front of the intervertebral space, potentially leading to postoperative collapse of the intervertebral fusion cage.

[0004] In view of this, there is an urgent need for an intervertebral disc reamer that is suitable for the physiological structure of the intervertebral space with a dome-shaped elliptical cylindrical structure that is low around and high in the center. Utility Model Content

[0005] The purpose of the utility model is to provide an intervertebral disc reamer to address the deficiencies in the prior art.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] The utility model provides an intervertebral disc reamer, comprising a handle and a reamer, wherein the handle is detachably connected to the reamer;

[0008] The handle has a hand-held end close to the operator and a fixed end away from the operator, and a reamer fixing opening is provided on the fixed end;

[0009] The reamer comprises: a shank detachably connected to the reamer fixing port, and a cutter head arranged at an end of the shank away from the handle;

[0010] Among them, the cutting head is a non-right-angle cutting head, and at least one cutting edge is provided on the cutting head.

[0011] Preferably, the cutting head is a rounded-corner cutting head or an obtuse-angle cutting head.

[0012] Further, the rounded-corner cutting head is composed of a first part with a rectangular cross-section and a second part with an arc-shaped cross-section. The first part is arranged at the proximal end, and the second part is arranged at the distal end, so that the distal end of the cutting head is rounded;

[0013] The obtuse-angle cutting head is composed of a third part with an isosceles trapezoid cross-section. The longer base of the third part is arranged at the proximal end, and the shorter base of the third part is arranged at the distal end, so that there are two relatively arranged obtuse angles at the distal end of the cutting head.

[0014] Preferably, the number of the cutting edges is four;

[0015] The cutting head has a front side and a rear side, and two of the cutting edges are provided on each of the front side and the rear side of the cutting head. The two cutting edges are respectively arranged at positions close to the left and right sides of the cutting head;

[0016] The cutting edge is a groove-shaped cutting edge.

[0017] Preferably, the tool shank and the cutting head are rotationally connected by a spherical hinge.

[0018] Preferably, a locking cavity is provided in the tool shank, and an opening communicating with the locking cavity is formed on the side wall of the tool shank.

[0019] Preferably, a locking mechanism is provided in the locking cavity.

[0020] Preferably, the locking mechanism includes:

[0021] A fixing rod, which is fixedly arranged in the locking cavity;

[0022] A pushing member, which is slidably sleeved on the fixing rod. A push handle is fixedly arranged on the pushing member, and the push handle extends out of the locking cavity through the opening; and

[0023] A clamping member, which is movably arranged at the bottom of the pushing member, and the clamping member can operably lock or unlock the spherical hinge.

[0024] Preferably, the opening is a "C"-shaped opening.

[0025] Preferably, the width of the cutting head is 7 mm - 14 mm.

[0026] The present invention adopts the above technical solution, and compared with the prior art, has the following technical effects:

[0027] The intervertebral disc reamer of the present invention is more in line with the blade shape of the upper and lower dome-shaped anatomical structure of the intervertebral space. On the one hand, it is easier to enter the intervertebral space. On the other hand, during the intervertebral disc hinging process, it fits more closely to the dome-shaped structure of the intervertebral space that is low on the periphery and high in the center, making the intervertebral disc treatment process more efficient and causing less damage to the bony end plates of the intervertebral space. In addition, the reamer's shank and the blade head are connected by a spherical hinge, which facilitates adjustment of the blade head angle and makes operation easier. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a front view of an intervertebral disc reamer according to an embodiment of the present utility model;

[0029] Figure 2 This is a right side view of the intervertebral disc reamer according to an embodiment of the present utility model;

[0030] Figure 3 This is a front view of a reamer with a rounded cutter head for an intervertebral disc reamer according to an embodiment of the present invention;

[0031] Figure 4 for Figure 3 A partial enlarged view of the middle A;

[0032] Figure 5 A front view of a reamer having an obtuse-angled blade of an intervertebral disc reamer according to an embodiment of the present invention;

[0033] Figure 6 A cross-sectional view of the shank of the intervertebral disc reamer according to an embodiment of the present invention when the spherical hinge is locked along the XX plane;

[0034] Figure 7 A cross-sectional view of the shank of the intervertebral disc reamer according to an embodiment of the present invention taken along plane XX when the spherical hinge is unlocked;

[0035] Figure 8 A bottom view of the handle of the intervertebral disc reamer according to an embodiment of the present invention;

[0036] Explanation of the reference numerals: 100 - handle, 110 - reamer fixing port, 200 - reamer, 210 - shank, 211 - opening, 212 - locking cavity, 213 - fixing rod, 214 - pushing member, 215 - push handle, 216 - clamping member, 220 - blade, 221 - blade, 230 - spherical hinge. DETAILED DESCRIPTION

[0037] The specific implementation of the present utility model will be described in detail below.

[0038] Unless otherwise defined, technical terms or scientific terms used in the claims and the description shall have the ordinary meanings understood by those of ordinary skill in the technical field to which the present utility model pertains.

[0039] The term "comprising" or similar terms used in the description of the present utility model patent application and the claims means that the objects appearing before "comprising" cover the objects listed after "comprising" or their equivalents, and do not exclude other objects.

[0040] Example 1

[0041] As Figure 1-8 shown, this embodiment provides an intervertebral disc reamer, comprising: a handle 100 and a reamer 200, wherein the handle 100 is detachably connected to the reamer 200; among which,

[0042] the handle 100 has a hand-held end close to the operator and a fixed end away from the operator, and a reamer fixing port 110 is provided on the fixed end;

[0043] the reamer 200 comprises: a tool shank 210 detachably connected to the reamer fixing port 110, and a tool tip 220 provided at one end of the tool shank 210 away from the handle 100;

[0044] among which, the tool shank 210 and the tool tip 220 are rotationally connected through a spherical hinge;

[0045] among which, the tool tip 220 is a rounded tool tip or an obtuse tool tip, the tool tip 220 has a front side and a rear side, and two grooved cutting edges 221 are provided on both the front side and the rear side of the tool tip 220, and the two cutting edges 221 are respectively provided at positions close to the left and right sides of the tool tip 220;

[0046] among which, a locking cavity 212 is provided in the tool shank 210, and a "C"-shaped opening 211 communicating with the locking cavity 212 is provided on the side wall of the tool shank 210, a locking mechanism is provided in the locking cavity 212, and the locking structure comprises:

[0047] a fixing rod 213, which is fixedly provided in the locking cavity 212;

[0048] a pushing member 214, which is slidably sleeved on the fixing rod 213, a pushing hand 215 is fixedly provided on the pushing member 214, and the pushing hand 215 extends out of the locking cavity 212 through the opening 211; and

[0049] The clamping member 216 is movably disposed at the bottom of the pushing member 214 , and the clamping member 216 is operable to lock or unlock the spherical hinge 230 .

[0050] Those skilled in the art will appreciate that the rounded corner cutter head is composed of a first portion with a rectangular cross section and a second portion with an arc-shaped cross section, wherein the first portion is provided at the proximal end and the second portion is provided at the distal end, so that the distal end of the cutter head 220 is rounded.

[0051] The obtuse-angled cutting head is composed of a third part with an isosceles trapezoidal cross-section, the longer base of the third part is arranged at the proximal end, and the shorter base of the third part is arranged at the distal end, so that the distal end of the cutting head 200 has two oppositely arranged obtuse angles.

[0052] In a preferred embodiment, the width a of the cutter head 220 is 7 mm to 14 mm.

[0053] During the operation, the surgeon holds the handheld end of the handle 100 of the intervertebral disc reamer of the embodiment of the present invention and pushes the cutter head 220 into the intervertebral space for processing. Since the cutter head 220 is a round cutter head or a blunt-angle cutter head, it is easier for the cutter head 220 to enter the intervertebral space and to process the upper and lower end plates of the central dome. When the cutter head 220 reaches the required angle, the surgeon pushes the push handle 115 to allow the clamping member 116 to lock the spherical hinge 230 to fix the cutter head 220, and then withdraws the cutter head 220 after the processing is completed.

[0054] In summary, the intervertebral disc reamer of the present invention is more in line with the blade shape of the upper and lower dome-shaped anatomical structure of the intervertebral space. On the one hand, it is easier to enter the intervertebral space. On the other hand, during the intervertebral space hinging process, it fits more closely to the dome-shaped structure of the intervertebral space that is low on the periphery and high in the center, making the intervertebral space treatment process more efficient and causing less damage to the bony end plates of the intervertebral space. In addition, the reamer's shank and the blade head are connected by a spherical hinge, which facilitates adjustment of the blade head angle and is easier to operate.

[0055] The above are only preferred embodiments of the present invention and do not limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. An intervertebral disc reamer, characterized in that: Comprising: A handle (100) and a reamer (200), wherein the handle (100) is detachably connected to the reamer (200); wherein, The handle (100) has a hand-held end close to the operator and a fixed end away from the operator, and a reamer fixing port (110) is provided on the fixed end; The reamer (200) includes: a shank (210) detachably connected to the reamer fixing port (110), and a cutter head (220) provided at one end of the shank (210) away from the handle (100); Wherein, the cutter head (220) is a non-right-angle cutter head, and at least one cutting edge (221) is provided on the cutter head (220).

2. The intervertebral disc reamer according to claim 1, wherein The cutter head (220) is a rounded cutter head, or the cutter head (220) is an obtuse cutter head.

3. The intervertebral disc reamer according to claim 1, wherein The number of the cutting edges (221) is four; The cutter head (220) has a front side and a rear side, and two of the cutting edges (221) are provided on each of the front side and the rear side of the cutter head (220), and the two cutting edges (221) are respectively provided at positions close to the left and right sides of the cutter head (220); The cutting edge (221) is a groove-shaped cutting edge.

4. The intervertebral disc reamer according to claim 1, wherein The shank (210) and the cutter head (220) are rotatably connected by a spherical hinge (230).

5. The intervertebral disc reamer according to claim 4, wherein The shank (210) has a locking cavity (212) therein, and an opening (211) communicating with the locking cavity (212) is provided on the side wall of the shank (210).

6. The intervertebral disc reamer according to claim 5, wherein A locking mechanism is provided in the locking cavity (212).

7. The intervertebral disc reamer according to claim 6, characterized in that: The locking mechanism includes: A fixed rod (213) fixedly provided in the locking cavity (212); A pushing member (214) slidably sleeved on the fixed rod (213), a pushing hand (215) is fixedly provided on the pushing member (214), and the pushing hand (215) extends out of the locking cavity (212) through the opening (211); and A clamping member (216) movably provided at the bottom of the pushing member (214), and the clamping member (216) can operably lock or unlock the spherical hinge (230).

8. The intervertebral disc reamer according to claim 7, wherein The opening (211) is a "匚"-shaped opening.

9. The intervertebral disc reamer according to claim 1, wherein The width (a) of the cutter head (220) is 7 mm - 14 mm.

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