Minimally invasive disc positioning device

Abstract

The utility model discloses a kind of minimally invasive intervertebral disc positioning devices, comprising: outer sleeve, it has the first inner cavity of axial extension;Inner sleeve, it is slidably nested in the first inner cavity, the inner sleeve has the second inner cavity of axial extension;Clamp part, it enters from the top end of the outer sleeve and is slidably coaxially nested in the second inner cavity;The clamp part is used for fixed puncture needle and makes the tip of the puncture needle from the bottom end of the inner sleeve stretch out;First elastomer, it is encircled on the clamp part between the top end of the inner sleeve and the first inner cavity top wall.The utility model can realize the purpose of accurate positioning intervertebral disc on XY axis without imageology assistance by the retracted length of inner sleeve relative to outer sleeve and the elastic deformation condition of first elastomer, without worrying about experimenter exposure in imageology assistance X-ray causes harm, and without buying expensive X-ray perspective equipment, reduce cost and threshold.

Description

Technical Field

[0001] This utility model relates to the field of medical technology, and in particular to a minimally invasive intervertebral disc positioning device. Background Technology

[0002] Lower back pain is a common ailment affecting the daily lives of people worldwide, and its incidence has been gradually increasing in recent years, placing a huge burden on global healthcare systems. The main cause of lower back pain is lumbar intervertebral disc degeneration. The primary method for studying intervertebral disc degeneration is to construct animal models of intervertebral disc degeneration to study the disease progression and degenerative mechanisms.

[0003] Currently, animal models of intervertebral disc degeneration can be categorized into mechanical stress change models, nucleus pulposus and annulus fibrosus injury models, endplate injury and nutritional disorder models, chemically induced models, and genetically related models. Among these, acupuncture-based disc modeling is one of the most common and effective methods for creating a nucleus pulposus and annulus fibrosus injury models. However, existing literature and techniques employ various methods for creating and administering medication through acupuncture. Some methods utilize X-rays to easily locate the disc, perform puncture, and administer medication, but the drawback is that the experimenter is exposed to a certain dose of X-rays, which can be harmful. Other methods involve incising the skin and separating nearby connective tissue to directly visualize and locate the disc, followed by puncture and medication administration. However, this method is more complex, causes greater damage to the animal, and introduces more confounding factors into the animal model, and is highly dependent on the surgeon's skill level. Some methods use percutaneous puncture to achieve minimally invasive surgery, but this method cannot directly visualize and locate the disc, and precise disc location remains difficult without X-rays. In addition, there are many improved techniques and procedures, such as bending the needle and adding a limiter to restrict the needle insertion depth. This has indeed effectively achieved precise positioning on the Z-axis, but it has not solved the problem of how to accurately locate the intervertebral disc on the XY-axis without the aid of imaging. On the contrary, these diverse modeling methods have complicated the experiment, increased the uncertainty of the experiment, and resulted in poor reproducibility.

[0004] In intervertebral disc injection, precise disc localization is also crucial for drug delivery. Therefore, the aforementioned deficiencies in disc localization significantly impact the injection process. This is especially true for certain drug studies that require multiple intervertebral disc injections. Whether using multiple X-ray localization methods or multiple open surgical procedures for direct visualization, these deficiencies amplify their impact.

[0005] Furthermore, training surgeons in disc localization through these procedures is costly and difficult for beginners to master. Utility Model Content

[0006] This invention provides a minimally invasive intervertebral disc positioning device to solve the problem in the prior art that requires the assistance of imaging to accurately locate the intervertebral disc on the XY axis, which can cause harm to the experimenter in X-rays.

[0007] The technical solution of this utility model is a minimally invasive intervertebral disc positioning device, comprising:

[0008] An outer tube having an axially extending first inner cavity;

[0009] An inner sleeve, which is slidably nested in the first inner cavity, has a second inner cavity extending axially;

[0010] A clamping member extends from the top end of the outer sleeve and is slidably coaxially nested in the second inner cavity; the clamping member is used to fix the puncture needle and allow the tip of the puncture needle to extend from the bottom end of the inner sleeve;

[0011] A first elastic body surrounds the clamping element between the top end of the inner sleeve and the top wall of the first inner cavity.

[0012] Furthermore, the top edge of the outer tube extends outward horizontally to form a platform for placing a universal level.

[0013] Furthermore, the clamping member includes an operating part and a clamping part, wherein the outer diameter of the top end of the clamping part is smaller than the outer diameter of the bottom end of the operating part;

[0014] The second inner cavity is provided with a flange near the bottom end of the inner sleeve;

[0015] The bottom end of the operating part is provided with an inwardly recessed first groove; the operating part extends from the top end of the outer sleeve and is slidably nested coaxially in the second inner cavity;

[0016] The top end of the clamping part extends into the bottom end of the inner sleeve and engages with the first slot, and the bottom end of the clamping part abuts against the flange. The outer wall of the clamping part between the flange and the bottom end of the operating part is surrounded by a second elastic body.

[0017] Furthermore, the operating part and the clamping part are provided with a receiving cavity along the same axial direction, and the inner diameter of the receiving cavity is adapted to the outer diameter of the puncture needle to guide the axial movement of the puncture needle;

[0018] Furthermore, the bottom end of the clamping part is provided with a clamping piece assembly along the circumferential direction, which is composed of multiple enclosable clamping pieces. The clamping piece assembly is used to clamp the puncture needle. The clamping piece assembly can be matched and clamped back into the second inner cavity and abut against the flange.

[0019] Furthermore, the top of the clamping part is provided with at least one snap-fit ​​block along the axial direction that is adapted to the first slot.

[0020] Furthermore, a handle is provided at the top of the operating part extending outward in the horizontal direction;

[0021] The top of the outer tube is provided with a second slot that is adapted to the handle portion.

[0022] Furthermore, the outer wall of the inner sleeve is provided with a first scale mark along the axial direction, the first scale mark being used to indicate the axial displacement of the inner sleeve.

[0023] Furthermore, the bottom of the outer wall of the inner sleeve is connected to an adjusting member via a linear displacement adjusting mechanism. The adjusting member is used to move along the axial direction of the inner sleeve via the linear displacement adjusting mechanism.

[0024] Furthermore, the linear displacement adjustment mechanism includes:

[0025] An external thread is provided around the bottom of the outer side wall of the inner sleeve, and an internal thread is provided around the inner side wall of the adjusting member, wherein the internal thread is adapted to the external thread.

[0026] Furthermore, the outer wall of the adjusting member is provided with a second scale mark along the axial direction, the second scale mark being used to indicate the axial displacement of the adjusting member.

[0027] Compared with the prior art, the present invention has at least the following beneficial effects:

[0028] 1. This invention, through the retraction length of the inner sleeve relative to the outer sleeve and the elastic deformation of the first elastic body, can achieve precise positioning of the intervertebral disc on the XY axis without the aid of imaging, accurately distinguishing the intervertebral disc from the vertebrae. It eliminates concerns about the experimenter (rat) being harmed by exposure to imaging-assisted X-rays, and eliminates the need to purchase expensive X-ray fluoroscopy equipment, thus reducing costs and barriers to entry. Furthermore, the minimally invasive intervertebral disc positioning device of this invention can repeatedly and accurately locate the intervertebral disc, simplifying the experimental procedure and improving the stability and repeatability of acupuncture modeling. Moreover, the precise positioning of the minimally invasive intervertebral disc positioning device of this invention can be used to train beginners in locating the intervertebral disc, reducing training costs and ease of learning.

[0029] 2. With the assistance of a universal level, this invention can achieve precise positioning of the intervertebral disc on the XYZ axis without the need for imaging assistance, accurately distinguishing the intervertebral disc from the vertebrae, without worrying about the experimenter (rat) being harmed by exposure to imaging-assisted X-rays. Attached Figure Description

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or accompanying drawings of this invention are used to distinguish different objects and not to describe a particular order.

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 A cross-sectional view of a minimally invasive intervertebral disc positioning device with a puncture needle installed, as proposed in this utility model.

[0033] Figure 2 This is a schematic diagram of the structure of a minimally invasive intervertebral disc positioning device proposed in this utility model;

[0034] Figure 3 This is a schematic diagram of the connection structure between the operating part and the clamping part proposed in this utility model;

[0035] Figure 4 This is a cross-sectional view of another minimally invasive intervertebral disc positioning device proposed in this utility model, with a puncture needle installed.

[0036] Figure label:

[0037] 10. Outer tube; 101. First inner cavity; 102. Placement platform; 103. Second slot; 104. Limiting block; 105. Friction texture;

[0038] 20. Inner sleeve; 201. Second inner cavity; 2011. First receiving cavity; 2012. Second receiving cavity; 202. Flange;

[0039] 30. Clamping component; 301. Operating part; 3011. First slot; 302. Clamping part; 3021. Snap-fit ​​block; 303. Receiving cavity; 304. Clamping piece; 305. Handle part; 306. Conical space;

[0040] 40. First elastic body;

[0041] 50. Second elastic body;

[0042] 60. Adjustable distance components;

[0043] 70. Linear displacement adjustment mechanism; 701. External thread; 702. Internal thread;

[0044] 80. Puncture needles. Detailed Implementation

[0045] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. Therefore, a feature pointed out in this specification is used to describe one feature of one embodiment of the present utility model, and does not imply that every embodiment of the present utility model must have the described feature. Furthermore, it should be noted that this specification describes many features. Although certain features may be combined to illustrate possible system designs, these features may also be used in other combinations not explicitly stated. Therefore, unless otherwise stated, the described combinations are not intended to be limiting.

[0046] The principle and structure of this utility model will be described in detail below with reference to the accompanying drawings and embodiments.

[0047] In some embodiments, such as Figure 1 As shown, this utility model provides a minimally invasive intervertebral disc positioning device that can accurately locate the intervertebral disc on the XY axis without the aid of imaging, comprising:

[0048] Outer tube 10, the outer tube 10 having an axially extending first inner cavity 101;

[0049] Inner sleeve 20, which is slidably nested in the first inner cavity 101, and the inner sleeve 20 has a second inner cavity 201 extending axially;

[0050] A clamping member 30 extends from the top end of the outer sleeve 10 and is slidably coaxially nested in the second inner cavity 201; the clamping member 30 is used to fix the puncture needle 80 and make the tip of the puncture needle 80 extend from the bottom end of the inner sleeve 20.

[0051] A first elastic body 40 surrounds the clamping member 30 between the top end of the inner sleeve 20 and the top wall of the first inner cavity 101.

[0052] It is understood that the outer sleeve 10, inner sleeve 20, and clamping member 30 proposed in this embodiment are preferably cylindrical in shape; similarly, the first inner cavity 101 and the second inner cavity 201 are preferably cylindrical in shape. The puncture needle 80 proposed in this embodiment includes, but is not limited to, injection needles, infusion needles, etc., and is not limited thereto. The first elastic body 40 proposed in this embodiment is preferably a compression spring.

[0053] It should be noted that the bottom end of the outer sleeve 10 corresponds to the end where the outer sleeve 10 and the inner sleeve 20 are nested, and the top end of the outer sleeve 10 corresponds to the other end of the outer sleeve 10 away from its nesting point (the nesting point is the position where the outer sleeve 10 and the inner sleeve 20 are nested), and the same applies throughout the text; similarly, the top end of the inner sleeve 20 corresponds to the end where the inner sleeve 20 and the outer sleeve 10 are nested, and the bottom end of the inner sleeve 20 corresponds to the other end of the inner sleeve 20 away from its nesting point, and the same applies throughout the text. Furthermore, the top wall of the first inner cavity 101 and the top end of the outer sleeve 10 are in the same direction.

[0054] Thus, when a minimally invasive intervertebral disc positioning device is needed to locate the intervertebral disc, the operator can first fix and clamp the corresponding puncture needle 80 with the clamp 30 to ensure that the puncture needle 80 does not shake, and it is necessary to ensure that the tip of the puncture needle 80 extends from the bottom of the inner sleeve 20 by a second preset length, thereby completing the installation of the puncture needle 80.

[0055] A 200g male SD rat was then anesthetized by intraperitoneal injection of 2ml of 2.5% tribromoethanol. After anesthesia, the rat's tail was straightened, and the location of subcutaneous blood vessels was marked to avoid them. The location of the intervertebral disc was roughly determined by manually bending the rat's tail and marked with a circle. The rat's tail was then disinfected with povidone-iodine. The operator then pinched or held the outer cannula 10 and positioned the puncture needle 80 perpendicular to the rat's tail. The needle was then inserted from the midpoint of the tail's width, selected from the marked circle. When the puncture needle 80 encountered resistance, the first elastic body 40 began to deform elastically, and the inner cannula 20 was visibly retracted into the outer cannula 10. At this point, if the inner cannula 20 retracts to the first preset length and the first elastic body 40 has not yet returned to its original position, it indicates that the puncture site of the puncture needle 80 can be considered as the vertebra, and the puncture can be stopped. After removing the puncture needle 80, continue to select different points in the marked circle for puncture. If the inner cannula 20 retracts to the first preset length and the first elastic body 40 returns to its original position, and the inner cannula 20 extends out of the outer cannula 10, it indicates that the puncture site of the puncture needle 80 is the intervertebral disc, and the puncture needle 80 has entered the intervertebral disc, and then proceed to the subsequent experimental steps.

[0056] Therefore, this invention, through the retraction length of the inner sleeve 20 relative to the outer sleeve 10 and the elastic deformation of the first elastic body 40, can achieve precise positioning of the intervertebral disc on the XY axis without the assistance of imaging (equivalent to X-ray fluoroscopy equipment), accurately distinguishing the intervertebral disc from the vertebral bone. There is no need to worry about the experimenter (rat) being harmed by exposure to imaging-assisted X-rays, and there is no need to purchase expensive X-ray fluoroscopy equipment, reducing costs and barriers to entry. Furthermore, the minimally invasive intervertebral disc positioning device of this invention can repeatedly and accurately achieve intervertebral disc positioning, simplifying the experimental procedure and improving the stability and repeatability of acupuncture modeling. Moreover, the precise positioning of the minimally invasive intervertebral disc positioning device of this invention can also be used to train beginners in the ability to locate intervertebral discs, reducing training costs and ease of learning.

[0057] It should be noted that the principle by which the minimally invasive intervertebral disc positioning device distinguishes between the intervertebral disc and the vertebrae through the first elastic body 40 is as follows:

[0058] When the needle of the puncture needle 80 encounters resistance at both the intervertebral disc and the vertebra, it will penetrate these structures when the force applied to the needle reaches the resistance threshold. The presence of the first elastic body 40 quantifies the force applied to the needle. When the needle, reinforced by the first elastic body 40, encounters the intervertebral disc or vertebra, initially the force applied to the needle has not yet reached the resistance threshold, and the needle cannot penetrate the structure. The first elastic body 40 undergoes elastic deformation to reflect the magnitude of the force. Then, when the force applied to the needle reaches the resistance threshold, the needle will penetrate the corresponding structure, and the first elastic body 40 returns to its original position. This provides feedback to the operator that the needle has penetrated the structure. Since the resistance threshold of the intervertebral disc is smaller than that of the vertebra, the puncture site can be distinguished as an intervertebral disc or a vertebra by comparing the quantified thrust with the resistance threshold (in practice, this can be achieved by comparing the elastic deformation of the first elastic body 40 to reflect the thrust and resistance threshold). If the first elastic body 40 fails to reset when the thrust exceeds the intervertebral disc resistance threshold, the location can be identified as a vertebra, thus achieving precise positioning of the intervertebral disc on the XY axis.

[0059] Furthermore, based on existing literature review and actual experiments, using a 25G (fine) needle for intervertebral disc puncture does not exacerbate intervertebral disc degeneration (Pfirrmann classification). This is because the 25G needle has a diameter of only 0.53mm, significantly smaller than the traditional 18G needle (>1mm), resulting in less mechanical damage to the annulus fibrosus and surrounding tissues during puncture, reducing postoperative inflammatory response and the risk of annulus fibrosus rupture. Additionally, 25G fine needle puncture requires less precise patient positioning (e.g., lumbar puncture does not require a strict "lobster pose"), making it suitable for patients with limited mobility (such as those with lower limb fractures or pregnant women), thus improving operational safety. Therefore, this demonstrates that although the minimally invasive intervertebral disc positioning device locates the intervertebral disc through puncture, using a 25G fine needle does not cause significant damage to the disc, thus constituting a minimally invasive positioning method. Moreover, the minimally invasive intervertebral disc positioning device itself uses a needle for puncture, which is also a percutaneous procedure; therefore, the entire needle puncture and modeling process is also considered a minimally invasive surgery.

[0060] In some embodiments, to ensure that the minimally invasive intervertebral disc positioning device can accurately position the intervertebral disc in the Z-axis direction (or axial direction), such as Figures 1-2 As shown, the top edge of the outer sleeve 10 extends outward horizontally to form a placement platform 102 for placing a universal level.

[0061] It should be noted that, in this embodiment, the top wall of the placement platform 102 and the top wall of the outer sleeve 10 are on the same horizontal plane; and the main body of the placement platform 102 is rectangular, with its end seamlessly connected to a standard circular area, forming a continuous overall shape.

[0062] Among them, the universal level is a tool that uses gravity and the movement of air bubbles in a liquid to detect whether the surface of an object is horizontal or vertical.

[0063] The universal level contains multiple sealed glass tubes, each filled with a liquid (such as alcohol or ether) and containing one air bubble. Different sealed glass tubes detect horizontal, vertical, or specific angles (such as 45°) respectively, enabling multi-directional calibration. This embodiment uses the accuracy of vertical detection as an example.

[0064] Furthermore, the sealed glass tube is designed with a slightly curved surface to ensure that the bubble automatically moves to the highest point under the influence of gravity. When the universal level is placed on a horizontal surface, the bubble will stay centered between the scale lines at the top of the sealed glass tube, indicating that it is vertical. If the surface is tilted, the bubble will deviate from the center, and the direction of deviation will be opposite to the direction of tilt. The distance of deviation reflects the degree of tilt.

[0065] Therefore, this embodiment achieves precise positioning of the intervertebral disc on the XY axis by adjusting the retraction length of the inner sleeve 20 relative to the outer sleeve 10 and the elastic deformation of the first elastic body 40. Then, in conjunction with a universal level, it achieves precise positioning of the intervertebral disc on the Z axis. This allows for precise positioning of the intervertebral disc on the XYZ axis without the need for imaging assistance, accurately distinguishing between the intervertebral disc and the vertebrae. There is no need to worry about the experimenter (rat) being exposed to imaging-assisted X-rays, thus avoiding harm and eliminating the need to purchase expensive X-ray fluoroscopy equipment, reducing costs and barriers to entry. Furthermore, the minimally invasive intervertebral disc positioning device of this invention allows for repeated and more accurate positioning of the intervertebral disc, simplifying the experimental procedure and improving the stability and repeatability of acupuncture modeling and puncture drug administration. Moreover, the precise positioning of the minimally invasive intervertebral disc positioning device of this invention can be used to train beginners in locating the intervertebral disc, reducing training costs and ease of learning.

[0066] In some embodiments, such as Figure 2 As shown, the outer wall of the outer sleeve 10 is surrounded by friction texture 105, which increases the micro-roughness of the contact surface, so that the operator will have greater resistance when contacting the outer sleeve 10, thus preventing the minimally invasive intervertebral disc positioning device from falling from the operator's hand.

[0067] In some embodiments, such as Figure 1 and Figure 3 As shown, the clamping member 30 includes an operating part 301 and a clamping part 302 that can detachably clamp the puncture needle 80. The outer diameter of the top end of the clamping part 302 is smaller than the outer diameter of the bottom end of the operating part 301.

[0068] The second inner cavity 201 is provided with an annular flange 202 near the bottom end of the inner sleeve 20;

[0069] The bottom end of the operating part 301 is provided with an inwardly recessed first slot 3011; the bottom end of the operating part 301 extends into the top end of the outer sleeve 10 and is slidably coaxially nested in the second inner cavity 201;

[0070] The top end of the clamping part 302 extends into the bottom end of the inner sleeve 20 and engages with the first slot 3011, and the bottom end of the clamping part 302 abuts against the flange 202. The outer wall of the clamping part 302 between the flange 202 and the bottom end of the operating part 301 is surrounded by a second elastic body 50.

[0071] It should be noted that the operating part 301 and the clamping part 302 proposed in this embodiment are preferably cylindrical. Of course, the operating part 301 and the clamping part 302 can also be prismatic or other suitable shapes, which are not limited here. The second elastic body 50 in this embodiment is preferably a compression spring.

[0072] The flange 202 divides the second inner cavity 201 into a first receiving cavity 2011 and a second receiving cavity 2012. The inner diameter of the first receiving cavity 2011 is greater than the inner diameter of the second receiving cavity 2012, which is greater than the inner diameter of the flange 202 that forms an annular shape. The outer diameter of the bottom end of the clamping part 302 is greater than the outer diameter of the rest of the clamping part 302. The outer diameter of the bottom end of the clamping part 302 is greater than the inner diameter of the flange 202 that forms an annular shape and less than the inner diameter of the second receiving cavity 2012. This ensures that the top end of the clamping part 302 can pass smoothly through the flange 202 into the first receiving cavity 2011, and the bottom end of the clamping part 302 cannot pass through the flange 202.

[0073] It can be seen that the bottom end of the operating part 301 extends into the top end of the outer sleeve 10 and is slidably nested coaxially in the first receiving cavity 2011; the top end of the clamping part 302 extends into the bottom end of the inner sleeve 20 and engages with the first slot 3011, and the bottom end of the clamping part 302 is located in the second receiving cavity 2012 and abuts against the flange 202.

[0074] Thus, when the needle of the puncture needle 80, which meets the usage requirements, needs to be clamped by the clamping part 302, the operating part 301 can be pressed down first. At this time, the second elastic body 50 undergoes elastic deformation, and the bottom end of the clamping part 302 is pushed out of the second receiving cavity 2012 by the operating part 301. At this time, the bottom end of the clamping part 302 is in a loose state, which makes it easy to put the needle of the puncture needle 80 in. Then, the operating part 301 is released. At this time, the operating part 301 will reset due to the elastic deformation of the second elastic body 50, thereby driving the bottom end of the clamping part 302 to re-enter the second receiving cavity 2012. At this time, the bottom end of the clamping part 302 will be tightly surrounded together in the second receiving cavity 2012, in a hugging state, to fix the needle of the puncture needle 80 and prevent shaking or loosening, so as to carry out the next experimental step.

[0075] Furthermore, since the outer diameter of the bottom end of the operating part 301 is larger than the inner diameter of the annular flange 202, it can prevent the bottom end of the operating part 301 from passing through the flange 202, ensuring that the operating part 301 will not fall off the inner sleeve 20 when pressed.

[0076] In some embodiments, to ensure that the clamping part 302 can better clamp the puncture needle 80, such as Figure 1 As shown, the operating part 301 and the clamping part 302 are provided with a receiving cavity 303 through the same axis. The inner diameter of the receiving cavity 303 is adapted to the outer diameter of the puncture needle 80 to guide the axial movement of the puncture needle 80.

[0077] Furthermore, the bottom end of the clamping part 302 is provided with a clamping piece assembly consisting of a plurality of enclosable clamping pieces 304 along the circumferential direction. The clamping piece assembly is used to clamp the puncture needle 80. The clamping piece assembly can match and clamp back into the second inner cavity 201 and abut against the flange 202.

[0078] Thus, when the operator presses down on the operating part 301, the second elastic body 50 undergoes elastic deformation, and the clamp assembly is pushed out of the second receiving cavity 2012 by the operating part 301. At this time, the clamp assembly is in a loose state. Then, the operator inserts the needle of the puncture needle 80 from the top of the operating part 301 into the receiving cavity 303 until it extends out of the clamp assembly. Then, the extension length of the needle of the puncture needle 80 is adjusted to the second preset length. After the adjustment is completed, the operator releases the operating part 301. At this time, the operating part 301 will reset due to the elastic deformation of the second elastic body 50, thereby driving the clamp assembly to re-enter the second receiving cavity 2012. During the re-entry process, the clamp assembly will be squeezed by the side wall of the second receiving cavity 2012 and gradually tighten, thereby tightly clamping the needle of the puncture needle 80, and then proceeding to the next experimental step.

[0079] In some embodiments, such as Figure 1 and Figure 3 As shown, a conical space 306 is provided in the middle of the accommodating cavity 303 of the clamping part 302. The inner diameter of the conical space 306 decreases sequentially along the insertion direction of the needle of the puncture needle 80 until it reaches a constant inner diameter value and remains unchanged. This facilitates the smooth insertion of the needle of the puncture needle 80 into the accommodating cavity 303 and its extension out of the clamping plate assembly.

[0080] In some embodiments, to ensure that the operating part 301 and the clamping part 302 form a detachable connection, such as Figure 3 As shown, the top end of the clamping part 302 is provided with at least one snap-fit ​​block 3021 that is adapted to the first slot 3011 along the axial direction.

[0081] In this embodiment, two engaging blocks 3021 are provided axially at the top of the clamping part 302, and each of the two engaging blocks 3021 engages with a first slot 3011. This allows the clamping part 302 to reduce the normal pressure between the engaging blocks 3021 and the corresponding first slot 3011 by swaying up and down along the axial direction, thereby reducing the friction between the engaging blocks 3021 and the corresponding first slot 3011, and thus allowing the clamping part 302 to disengage from the operating part 301. Of course, depending on the actual situation, the top of the clamping part 302 may also have one, three, or more engaging blocks 3021 axially, which is not limited here.

[0082] In some embodiments, the contact surface of the clamp 304 in the clamp assembly that holds the needle is roughened with a frosted finish to increase the friction between the clamp assembly and the needle, ensuring that the clamping part 302 can more stably hold the needle of the puncture needle 80.

[0083] In some embodiments, such as Figure 2As shown, the top of the operating part 301 extending out of the outer sleeve 10 is provided with handle parts 305 on both sides in the horizontal direction.

[0084] The top end of the outer sleeve 10 is provided with a second slot 103 that is adapted to the handle portion 305.

[0085] It should be noted that the top of the outer tube 10 has two opposing limiting blocks 104 circumferentially arranged with its center as the midpoint. The limiting blocks 104 are arc-shaped, and a second slot 103 is formed between the limiting blocks 104 and the top of the outer tube 10 below them; each handle part 305 is engaged with a corresponding second slot 103.

[0086] In this way, the operator first rotates the handle 305 to engage with the corresponding second slot 103, and then presses down on the operating part 301. At this time, the second elastic body 50 undergoes elastic deformation, and the clip assembly is pushed out of the second receiving cavity 2012 by the operating part 301. At this time, the clip assembly is dispersed and in a loose state. Then, the operator inserts the needle of the puncture needle 80 (preferably a 25G type needle longer than 4cm) from the top of the operating part 301 into the receiving cavity 303 until it extends out of the clip assembly. Then, the operator adjusts the needle of the puncture needle 80 to extend to the second preset length. At this time, only the second elastic body 50 undergoes elastic deformation, while the first elastic body 40 is unaffected. This can avoid the situation where the first elastic body 40 also undergoes elastic deformation when the second elastic body 50 undergoes elastic deformation.

[0087] If the handle 305 is not first engaged with the corresponding second slot 103, and the second elastic body 50 undergoes elastic deformation, the operator would need to simultaneously grasp or hold the handle 305 and the inner sleeve 20, making single-handed operation inconvenient (as the other hand needs to hold the puncture needle 80). Furthermore, since the needle is a sharp instrument, care must be taken to avoid injury. However, by first engaging the handle 305 with the corresponding second slot 103, the operator can press down the operating part 301 with just one finger to push the clip assembly out of the second receiving cavity 2012 and release it. Then, the operator uses their other hand to insert the needle of the puncture needle 80 from the top of the operating part 301 into the receiving cavity 303 until it extends out of the clip assembly. The operator then adjusts the needle extension of the puncture needle 80 to the second preset length, thus simplifying the operation.

[0088] Then the operator releases the operating part 301. At this time, the operating part 301 will reset due to the elastic deformation of the second elastic body 50, thereby driving the clamp assembly to re-enter the second receiving cavity 2012. During the re-entry process, the clamp assembly will be squeezed by the side wall of the second receiving cavity 2012 and gradually tightened, thereby tightly clamping the needle of the puncture needle 80, thus completing the installation of the puncture needle 80.

[0089] A 200g male SD rat was then anesthetized by intraperitoneal injection of 2ml of 2.5% tribromoethanol. After anesthesia, the rat's tail was straightened, and the location of subcutaneous blood vessels was marked to avoid them. The location of the intervertebral disc was roughly determined by manually bending the rat's tail and marked with a circle. The rat's tail was then disinfected with iodine. The rat's tail was placed horizontally on the table, and the operator pinched or held the outer cannula 10, positioning the puncture needle 80 perpendicular to the rat's tail. When the bubble in the gimbal level was centered, it indicated that the puncture needle 80 was perpendicular to the rat's tail. Then, a point was selected from the marked circle, and the needle was inserted from the midpoint of the tail's width. When the puncture needle 80 encountered resistance, the first elastic body 40 began to deform elastically, and the inner cannula 20 was seen to retract into the outer cannula 10. At this point, if the inner cannula 20 retracts to the first preset length (8mm) and the first elastic body 40 has not yet returned to its original position, it indicates that the puncture site of the puncture needle 80 can be considered as the vertebra, and puncture should be stopped. Then, the puncture needle 80 should be withdrawn and different points in the marked circle should be selected for puncture. If the inner cannula 20 retracts to the first preset length (8mm) and the first elastic body 40 returns to its original position, and the inner cannula 20 extends out of the outer cannula 10, it indicates that the puncture site of the puncture needle 80 is the intervertebral disc, and the puncture needle 80 has entered the intervertebral disc. This demonstrates the operation procedure of using a minimally invasive intervertebral disc positioning device to locate the intervertebral disc. This positioning can also be used to provide feedback and training to beginners on their ability to locate the intervertebral disc.

[0090] In some embodiments, the outer wall of the inner sleeve 20 is provided with a first scale mark (not shown, same throughout) along the axial direction, the first scale mark being used to indicate the axial displacement of the inner sleeve 20.

[0091] It should be noted that the first scale mark proposed in this embodiment is preferably a millimeter scale line and a corresponding number mark arranged at equal intervals. The scale line and number mark of the first scale mark are formed by laser etching or UV printing. The surface of the scale line and number mark is covered with a transparent wear-resistant layer. The material of the transparent wear-resistant layer is polyurethane or epoxy resin.

[0092] This allows for a clear understanding of the length by which the inner sheath 20 retracts into the outer sheath 10, and, in conjunction with the elastic deformation of the first elastomer 40, further improves the accuracy of intervertebral disc localization.

[0093] In some embodiments, to finely adjust the puncture length of the needle and thus accurately control the depth of insertion, it is helpful to accurately insert the needle to the predetermined depth after measuring and determining the intervertebral disc depth with an instrument, thereby achieving precise positioning on the Z-axis, such as... Figure 1 As shown, the bottom of the outer wall of the inner sleeve 20 is connected to an adjusting member 60 via a linear displacement adjusting mechanism 70. The linear displacement adjusting mechanism 70 is used to drive the adjusting member 60 to move along the axial direction of the inner sleeve 20.

[0094] It should be noted that the shape of the adjusting member 60 is preferably a hollow cylinder.

[0095] Because the needle insertion length of the minimally invasive intervertebral disc positioning device varies depending on the specific circumstances. For example:

[0096] Because the height of the rat's tail varies from individual to individual, and the insertion length of the minimally invasive intervertebral disc positioning device is half the height of the rat's tail, the operator can adjust the adjusting piece 60 to move along the axial direction of the inner cannula 20 when the rat's tail height is different, thereby increasing or decreasing the exposed length of the puncture needle 80 (equivalent to the insertion length of the puncture needle 80), so that the exposed length of the puncture needle 80 is half the height of the rat's tail.

[0097] Specifically, this embodiment proposes a structure for a linear displacement adjustment mechanism 70, which includes:

[0098] An external thread 701 is provided around the bottom of the outer side wall of the inner sleeve 20 and an internal thread 702 is provided around the inner side wall of the adjusting member 60, wherein the internal thread 702 is adapted to the external thread 701.

[0099] Thus, when the operator needs to adjust the adjusting element 60, he can rotate the adjusting element 60 to move it along the axial direction of the inner sleeve 20, thereby changing the insertion length of the puncture needle 80.

[0100] For ease of understanding, in this embodiment, each rotation of the adjusting element 60 changes the insertion length of the puncture needle 80 by 1.5mm. For example, rotating the adjusting element 60 clockwise by one revolution increases the insertion length of the puncture needle 80 by 1.5mm; similarly, rotating the adjusting element 60 counterclockwise by one revolution decreases the insertion length of the puncture needle 80 by 1.5mm. Of course, the insertion length changed by each rotation of the adjusting element 60 can be changed according to actual conditions and is not limited to 1.5mm.

[0101] Of course, in other embodiments (not shown in the figures), the linear displacement adjustment mechanism 70 includes:

[0102] At least one guide groove is provided on the outer wall of the inner sleeve 20 and extends axially, and a guide slider is provided on the inner wall of the adjusting member 60 and is adapted to the guide groove. The bottom end of the inner sleeve 20 is slidably nested inside the adjusting member 60. At the same time, the guide slider is slidably engaged with the corresponding guide groove. The cross-section of the guide groove is T-shaped, and the head size of the guide slider is slightly smaller than the T-shaped space of the guide groove, so that the adjusting member 60 can slide along the axial direction of the inner sleeve 20 but cannot rotate.

[0103] Furthermore, the outer wall of the bottom end of the inner sleeve 20 is provided with a first limiting protrusion, and the inner wall of the adjusting member 60 is provided with a second limiting protrusion facing the top end of the outer sleeve 10. Thus, when the adjusting member 60 moves towards the bottom end of the inner sleeve 20, the guide slider slides along the guide groove until the second limiting protrusion contacts the first limiting protrusion of the inner sleeve 20, at which point the maximum extension position is reached. Similarly, when moving in the opposite direction (the adjusting member 60 moves towards the top end of the inner sleeve 20), the adjusting member 60 can retract to the initial position.

[0104] Furthermore, the outer wall of the adjusting member 60 has at least one threaded hole penetrating through it, and this threaded hole is also fitted with a locking bolt, forming a locking assembly with the threaded hole and the corresponding locking bolt. The end of the locking bolt is provided with an elastic clamping element, preferably a 2mm thick silicone pad, and the surface of the pad is machined with a 0.5mm deep diamond-shaped anti-slip texture. When the locking bolt is screwed into the corresponding threaded hole, the elastic clamping element will form surface contact with the outer wall of the inner sleeve 20 and lock in position through friction.

[0105] In some embodiments, the outer side wall of the adjusting member 60 is provided with a second scale mark (not shown, same throughout) along the axial direction, the second scale mark being used to indicate the axial displacement of the adjusting member 60.

[0106] It should be noted that the second scale mark proposed in this embodiment is preferably a millimeter scale line (0.1mm) and a corresponding number mark arranged at equal intervals. The scale line and number mark of the second scale mark are formed by laser etching or UV printing. The surface of the scale line and number mark is covered with a transparent wear-resistant layer. The material of the transparent wear-resistant layer is polyurethane or epoxy resin.

[0107] This allows for clear measurement of the length of the adjusting element 60 on the inner cannula 20, and precise control of the insertion length of the puncture needle 80.

[0108] In another embodiment, the use of a minimally invasive intervertebral disc positioning device for acupuncture modeling is demonstrated, and the specific process is as follows:

[0109] A 300g male SD rat was anesthetized by intraperitoneal injection of 2.5ml of 2.5% tribromoethanol. After anesthesia, the rat's tail was straightened, and the location of subcutaneous blood vessels was marked to avoid them. The location of the intervertebral disc was roughly determined by manually bending the rat's tail and marked with a circle. The height of the tail segment was measured.

[0110] Then, rotate the handle 305 to engage with the corresponding second slot 103, and press down on the operating part 301. At this time, the second elastic body 50 undergoes elastic deformation, and the clamp assembly is pushed out of the second receiving cavity 2012 by the operating part 301. The clamp assembly is now in a loose state. The operator then inserts the needle of the puncture needle 80 (preferably an 18G type needle longer than 4cm) from the top of the operating part 301 into the receiving cavity 303 until it extends out of the clamp assembly by the second preset length. The operator then releases the operating part 301, which will reset due to the elastic deformation of the second elastic body 50, thereby driving the clamp assembly back into the second receiving cavity 2012, thus tightly clamping the needle of the puncture needle 80, completing the installation of the puncture needle 80. Afterwards, adjust the adjusting part 60 so that the exposed needle length of the puncture needle 80 is half the height of the rat's tail.

[0111] Then, disinfect the rat's tail with iodine solution, place the rat's tail horizontally on the table, and then the operator pinches or holds the outer tube 10, and punctures the needle 80 perpendicular to the rat's tail. When the bubble of the universal level is in the center, it indicates that the puncture needle 80 is perpendicular to the rat's tail. Then, select a point from the marked circle and insert the needle from the midpoint of the left and right width of the tail.

[0112] At this point, if the inner cannula 20 retracts to the first preset length (8mm) and the first elastic body 40 has not yet returned to its original position, it indicates that the puncture site of the needle 80 can be considered a vertebra, and puncture should be stopped. Then, the needle 80 should be withdrawn, and punctures should continue at different points selected in the marked circle. If the inner cannula 20 retracts to the first preset length (8mm), and the first elastic body 40 returns to its original position, and the inner cannula 20 extends from the outer cannula 10, it indicates that the puncture site of the needle 80 is the intervertebral disc, and the needle 80 has entered the intervertebral disc. After the needle enters the intervertebral disc, the needle protruding from the adjusting piece 60 should be fully inserted into the rat's tail. Then, rotate for 10 seconds, hold for 60 seconds, withdraw the needle, and disinfect the rat's tail again to complete the modeling process.

[0113] In another embodiment, such as Figure 4 The image shows how to use a minimally invasive intervertebral disc positioning device for minimally invasive disc puncture and drug delivery. The specific procedure is as follows:

[0114] In this embodiment, the puncture needle 80 is preferably a micro-syringe.

[0115] A 300g male SD rat was anesthetized by intraperitoneal injection of 2.5ml of 2.5% tribromoethanol. After anesthesia, the rat's tail was straightened, and the location of subcutaneous blood vessels was marked to avoid them. The location of the intervertebral disc was roughly determined by manually bending the rat's tail and marked with a circle. The height of the tail segment was measured.

[0116] Next, rotate the handle 305 to engage with the corresponding second slot 103, and then press down on the operating part 301. At this time, the second elastic body 50 undergoes elastic deformation, and the clip assembly is pushed out of the second receiving cavity 2012 by the operating part 301. The clip assembly is now in a loosened state. Then, the operator inserts the needle of the micro-injector into the receiving cavity 303 from the top of the operating part 301 until it extends out of the clip assembly by the second preset length. Then, the operator releases the operating part 301. At this time, the operating part 301 will reset due to the elastic deformation of the second elastic body 50, thereby driving the clip assembly back into the second receiving cavity 2012, thus tightly clamping the needle of the micro-injector, completing the installation of the micro-injector. Afterwards, adjust the adjusting part 60 so that the length of the exposed needle of the micro-injector is half the height of the rat's tail.

[0117] Then, disinfect the rat's tail with iodine solution, place the rat's tail horizontally on the table, and then the operator pinches or holds the outer tube 10, and holds the micro-injector perpendicular to the rat's tail. When the bubble of the universal level is in the center, it indicates that the micro-injector is perpendicular to the rat's tail. Then, select a point from the marked circle and insert the needle from the midpoint of the left and right width of the tail.

[0118] At this point, if the inner cannula 20 retracts to the first preset length (8mm) and the first elastic body 40 has not yet returned to its original position, it indicates that the location of the micro-injector puncture at this point can be considered as the vertebra, and the puncture should be stopped. The micro-injector should then be withdrawn, and punctures should continue at different points selected in the marked circle. If the inner cannula 20 retracts to the first preset length (8mm), and the first elastic body 40 returns to its original position, with the inner cannula 20 extending from the outer cannula 10, it indicates that the location of the micro-injector puncture at this point is the intervertebral disc, and the micro-injector has entered the intervertebral disc. After the needle enters the intervertebral disc, the needle protruding from the adjusting piece 60 is fully inserted into the rat's tail. The medication is then slowly injected, and after injection, the needle is withdrawn. The rat's tail is then disinfected again to complete the minimally invasive intervertebral disc puncture and drug administration.

[0119] Therefore, the minimally invasive intervertebral disc positioning device proposed in this embodiment can hold a micro-injector for drug administration. It can achieve intervertebral disc positioning puncture and drug administration in a highly integrated manner. The experimental procedure is simple and the modeling effect is stable and easy to repeat.

[0120] Obviously, the embodiments described above are only some embodiments of this utility model, not all embodiments. The accompanying drawings show preferred embodiments of this utility model, but do not limit the patent scope of this utility model. This utility model can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this utility model specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this utility model.

Claims

1. A minimally invasive intervertebral disc positioning device, characterized in that, include: Outer tube (10), the outer tube (10) having an axially extending first inner cavity (101); Inner sleeve (20) slidably nested in the first inner cavity (101), the inner sleeve (20) having a second inner cavity (201) extending axially; A clamping member (30) extends from the top end of the outer sleeve (10) and is slidably coaxially nested in the second inner cavity (201); the clamping member (30) is used to fix the puncture needle (80) and allow the tip of the puncture needle (80) to extend from the bottom end of the inner sleeve (20); A first elastic body (40) surrounds a clamping member (30) between the top end of the inner sleeve (20) and the top wall of the first inner cavity (101).

2. The minimally invasive intervertebral disc positioning device according to claim 1, characterized in that, The top edge of the outer tube (10) extends outward horizontally to form a placement platform (102) for placing a universal level.

3. The minimally invasive intervertebral disc positioning device according to claim 1, characterized in that, The clamping member (30) includes an operating part (301) and a clamping part (302), wherein the outer diameter of the top end of the clamping part (302) is smaller than the outer diameter of the bottom end of the operating part (301); The second inner cavity (201) is provided with a flange (202) near the bottom end of the inner sleeve (20); The bottom end of the operating part (301) is provided with an inwardly recessed first slot (3011); the operating part (301) extends from the top end of the outer sleeve (10) and is slidably nested coaxially in the second inner cavity (201); The top end of the clamping part (302) extends into the bottom end of the inner sleeve (20) and engages with the first slot (3011), and the bottom end of the clamping part (302) abuts against the flange (202). The outer wall of the clamping part (302) between the flange (202) and the bottom end of the operating part (301) is surrounded by a second elastic body (50).

4. The minimally invasive intervertebral disc positioning device according to claim 3, characterized in that, The operating part (301) and the clamping part (302) are provided with a receiving cavity (303) through the same axis. The inner diameter of the receiving cavity (303) is adapted to the outer diameter of the puncture needle (80) to guide the axial movement of the puncture needle (80). The bottom end of the clamping part (302) is provided with a clamping piece assembly consisting of a plurality of enclosable clamping pieces (304) along the circumferential direction. The clamping piece assembly is used to clamp the puncture needle (80). The clamping piece assembly can match and clamp back into the second inner cavity (201) and abut against the flange (202).

5. The minimally invasive intervertebral disc positioning device according to claim 3, characterized in that, The top end of the clamping part (302) is provided with at least one snap-fit ​​block (3021) that is adapted to the first slot (3011) along the axial direction.

6. The minimally invasive intervertebral disc positioning device according to claim 3, characterized in that, The top end of the operating part (301) extending out of the outer sleeve (10) is provided with a handle part (305) extending outward in the horizontal direction; The top end of the outer tube (10) is provided with a second slot (103) that is adapted to the handle portion (305).

7. The minimally invasive intervertebral disc positioning device according to claim 1, characterized in that, The outer wall of the inner sleeve (20) is provided with a first scale mark along the axial direction. The first scale mark is used to indicate the axial displacement of the inner sleeve (20).

8. The minimally invasive intervertebral disc positioning device according to claim 1, characterized in that, The bottom of the outer wall of the inner sleeve (20) is connected to an adjusting member (60) via a linear displacement adjusting mechanism (70). The linear displacement adjusting mechanism (70) is used to drive the adjusting member (60) to move along the axial direction of the inner sleeve (20).

9. The minimally invasive intervertebral disc positioning device according to claim 8, characterized in that, The linear displacement adjustment mechanism (70) includes: An external thread (701) is provided around the bottom of the outer side wall of the inner sleeve (20), and an internal thread (702) is provided around the inner side wall of the adjusting member (60), wherein the internal thread (702) is adapted to the external thread (701).

10. The minimally invasive intervertebral disc positioning device according to claim 8, characterized in that, The outer wall of the adjusting member (60) is provided with a second scale mark along the axial direction. The second scale mark is used to indicate the axial displacement of the adjusting member (60).

Images