Biopsy tool for minimally invasive centrum tissue taking

Abstract

The biopsy tool for minimally invasive centrum tissue taking comprises a sleeve assembly and a sampling assembly which are sequentially arranged from outside to inside, the sampling assembly comprises a sampling handle and a sampling shaft vertically fixed to the lower end of the sampling handle, the sampling shaft penetrates through the sleeve assembly, and a grabbing head is installed at the end, penetrating through the sleeve assembly, of the sampling shaft. The grabbing head extends out of the sleeve assembly, the sleeve assembly is in threaded connection with the sampling shaft, the sampling shaft moves up and down when rotating, and the grabbing head is driven by the sampling shaft to change the form and / or position. The pathological tissue locking device can firmly lock the obtained pathological tissue in the working process, and the pathological tissue is prevented from falling off when the device retreats.

Description

Technical Field

[0001] The utility model relates to the technical field of orthopedic medical instruments, in particular to a minimally invasive vertebral tissue biopsy tool. Background Art

[0002] Intravertebral biopsy is based on taking a small tissue sample from the vertebral body for intraoperative and postoperative pathological identification. With the development of minimally invasive spinal surgery and intraoperative fluoroscopy, percutaneous pedicle intravertebral biopsy is now possible and is widely used in percutaneous vertebroplasty and percutaneous kyphoplasty for the treatment of spinal fractures, becoming the diagnostic standard for pathological spinal fractures.

[0003] However, although intravertebral biopsy is widely used in spinal surgery and some surgical tools specifically used for intravertebral biopsy have appeared in clinical practice, most of them are not ideal in actual application.

[0004] Taking the biopsy tool of percutaneous vertebroplasty as an example, the most commonly used one is a hollow cylindrical metal straight tube with a serrated front end. First, the surgeon uses a puncture tool to establish a working channel through the pedicle to reach the vertebral body. Then, the surgeon slowly advances the biopsy straight tube through the pedicle. During the advancement, the tissue in the vertebral body enters the straight tube. When the front end of the straight tube reaches the appropriate depth or target lesion, the surgeon rotates the straight tube, and the front serrations shear and separate the tissue inside the front straight tube from the tissue outside the straight tube. Finally, the surgeon withdraws the straight tube and takes out the tissue taken from the straight tube for inspection. Although this type of biopsy tool is simple to operate, it can often only obtain a small amount of pathological tissue in clinical use.

[0005] In addition, the cannula device currently used for taking out pathological tissue does not have any parts for storing pathological tissue, and only relies on the friction between the cannula and the pathological tissue to bring out the pathological tissue. However, the surface of the cannula is smooth, so taking out pathological tissue often ends in failure or requires repeated taking, which greatly reduces work efficiency and diagnostic success rate.

[0006] In summary, there is an urgent need for a biopsy tool that can obtain a large amount of pathological tissue and cause little trauma to the vertebral body. Utility Model Content

[0007] In view of this, the purpose of the utility model is to provide a minimally invasive vertebral tissue biopsy tool.

[0008] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0009] A minimally invasive vertebral tissue biopsy tool comprises a cannula assembly and a sampling assembly arranged in sequence from outside to inside, the sampling assembly comprises a sampling handle and a sampling shaft vertically fixed at the lower end of the sampling handle, the sampling shaft passes through the cannula assembly, a grabbing head is installed on one end of the sampling shaft passing through the cannula assembly, and the grabbing head extends from the cannula assembly;

[0010] The sleeve assembly is threadedly connected to the sampling shaft. The sampling shaft moves up and down when rotating, and the grabbing head is driven by the sampling shaft to change shape and / or position.

[0011] Furthermore, the sleeve assembly includes a sleeve handle and a sleeve body fixed at the lower end of the sleeve handle.

[0012] Furthermore, the grabbing head is composed of a plurality of steel wires, one end of each of the steel wires is fixed to the end of the sampling shaft away from the sampling handle, and each of the steel wires is gathered at one point, and the other end is fixed in sequence along the circumferential direction to the end of the casing body away from the casing handle;

[0013] When the sampling shaft rotates upward, the steel wire is stretched out, and when the sampling shaft rotates downward, the steel wire is straightened.

[0014] Furthermore, the grabbing head is a spiral head, and the rotation direction of the spiral head is opposite to the rotation direction of the threaded connection between the sleeve assembly and the sampling shaft.

[0015] Furthermore, the sleeve body and the sampling shaft are connected via internal and external screws.

[0016] Furthermore, a baffle matching with the inner and outer screws is installed on the sleeve body.

[0017] Furthermore, the baffle is disc-shaped.

[0018] Furthermore, the sleeve body is a hollow structure.

[0019] Furthermore, the sampling shaft is a solid structure.

[0020] Furthermore, the sleeve handle is a T-shaped handle.

[0021] Compared with the prior art, the utility model has the advantages that: by inserting the grabbing head into the pathological tissue, the sampling shaft and the threaded device are used to pull, when the sampling shaft is rotated downward, the grabbing head grabs the pathological tissue, and when the sampling shaft is rotated upward, the grabbing head takes the pathological tissue out, which can effectively increase the amount of pathological tissue obtained compared with the traditional intravertebral biopsy tool. At the same time, the grabbing head can firmly lock the acquired pathological tissue to prevent the pathological tissue from falling when the device is retracted. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Attached Figure 1 It is a cross-sectional structural schematic diagram of the grabbing head in a folded state according to an embodiment of the utility model;

[0024] Attached Figure 2 It is a cross-sectional structural schematic diagram of the grabbing head in an open state according to an embodiment of the utility model;

[0025] Attached Figure 3 This is a schematic cross-sectional view of an embodiment of the utility model;

[0026] Attached Figure 4 It is a schematic diagram of the top view of the structure of an embodiment of the utility model.

[0027] Description of the reference numerals and components involved in the drawings: 1. cannula handle; 2. cannula body; 3. sampling handle; 4. sampling shaft; 5. grabbing head; 6. steel wire; 7. spiral head; 8. internal and external screws; 9. baffle. DETAILED DESCRIPTION

[0028] The technical solution of the utility model will be clearly and completely described below through specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] Embodiment 1:

[0030] See attached Figure 1 and attached Figure 2As shown, a minimally invasive vertebral tissue biopsy tool includes a cannula assembly and a sampling assembly arranged in sequence from the outside to the inside, the cannula assembly includes a cannula handle 1 and a cannula body 2 fixed at the lower end of the cannula handle 1, the sampling assembly includes a sampling handle 3 and a sampling shaft 4 vertically fixed at the lower end of the sampling handle 3, the sampling shaft 4 passes through the cannula body 2, and a grab head 5 is installed on one end of the sampling shaft 4 passing through the cannula body 2, and the grab head 5 extends from the cannula body 2, and the cannula body 2 is threadedly connected to the sampling shaft 4. The grab head 5 in this embodiment is composed of a plurality of steel wires 6, one end of each of the steel wires 6 is fixed to the end of the sampling shaft 4, and each steel wire 6 is gathered to a point, and the other end is fixed to the end of the cannula body 2 in sequence along the circumferential direction. When the sampling shaft 4 is rotated upward, the steel wire 6 will be stretched, and when the sampling shaft 4 is rotated downward, the steel wire 6 will be straightened.

[0031] It can be seen from the shape of the grab head 5 that this embodiment is designed according to the structure of an egg beater, and the egg beater-like grab head 5 in this embodiment is provided with 6 steel wires 6. As can be seen from the figure, it is divided into a T-shaped sampling handle 3, a sampling shaft 4, a T-shaped sleeve handle 1, a sleeve body 2 and an egg beater-like grab head 5 from top to bottom. Among them, the sleeve body 2 is provided with a thread, and the sampling shaft 4 is connected to the sleeve body 2 through the thread. By rotating the sampling handle 3, the sampling shaft 4 can be extended and retracted up and down. The lower ends of the 6 steel wires 6 on the egg beater-like grab head 5 are welded to the sampling shaft 4, and the upper ends are welded to the sleeve body 2. When the device goes deeper, the sampling shaft 4 rotates to the lowest end, so that the steel wire 6 on the grabbing head 5 is straightened, reducing the depth section diameter and reducing the depth resistance. When the grabbing head 5 reaches the appropriate position in the vertebral body, the sampling shaft 4 rotates to the highest end. At this time, the steel wire 6 on the grabbing head 5 is stretched open. By rotating the T-shaped sampling handle 3, the bone in the vertebral body is crushed and enters the cage surrounded by the steel wire 6. The sampling shaft 4 is rotated again to return to the lowest end. At this time, the steel wire cage is closed and fixed. The pathological sample can be obtained by lifting the T-shaped sampling handle 3 and retracting the device.

[0032] The device is designed in the shape of an egg stirrer, and has a novel concept. When the grab head 5 is retracted, the depth cross-sectional diameter can be reduced and the depth resistance can be reduced. When the grab head 5 is opened and stirred, its cage-like structure can expand the grabbing range and obtain more pathological tissues. When the grab head 5 is retracted again, the obtained tissue can be firmly locked to prevent the tissue from falling when the device is retracted.

[0033] The use process of this embodiment is as follows: after percutaneous pedicle puncture to establish the working channel, insert the cannula body 2. Rotate the sampling shaft 4 to the lowest end, tap the T-shaped sampling handle 1 to make it slowly go deeper, and when the grabbing head 5 reaches the appropriate position in the vertebral body, rotate the sampling shaft 4 to the highest end, at which time the steel wire 6 on the grabbing head 5 is stretched into a cage shape, and by rotating the sampling handle 3, the bone in the vertebral body is crushed and enters the cage surrounded by the steel wire 6, and the sampling shaft 4 is rotated again to return to the lowest end, at which time the steel wire cage closes and fixes the bone in the cage, and the upper extraction sampling handle 3 retracts the device to obtain the pathological sample.

[0034] Implementation 2:

[0035] See attached Figure 3 and attached Figure 4 As shown, a minimally invasive vertebral tissue biopsy tool is divided into a sampling handle 3, a sampling shaft 4, a baffle 9, a sleeve handle 1, a sleeve body 2 and a corkscrew head 7 in the style of a corkscrew from top to bottom. It can be seen from the figure that this embodiment is designed with reference to the structure of a red wine bottle opener. Among them, the sleeve body 2 is provided with a thread in the opposite direction to the spiral head 7, and the thread fits with the baffle 9 to form a device with adjustable depth. Since the thread rotation direction of the spiral head 7 is opposite to the thread rotation direction inside the sleeve body 2, it is convenient to pull up the pathological tissue. This embodiment is designed with reference to the structure of a red wine bottle opener, and the concept is novel. By inserting the corkscrew-like spiral head 7 into the pathological tissue and pulling it with the reverse thread device, the pathological tissue can be removed.

[0036] The use process of this embodiment is as follows: after percutaneous pedicle puncture to establish the working channel, insert the cannula body 2, rotate the reverse thread device of the device to the top, so that there is space in the front end of the cannula body 2 to accommodate the pathological tissue. After the cannula body 2 is observed to have entered to a suitable depth, screw the sampling shaft 4 forward, insert the corkscrew head 7 into the pathological tissue, and then continue to rotate the sampling shaft 4 forward, and the sampling shaft 4 and the baffle 9 pull the pathological tissue out of the body through threads in different directions, peel off the pathological tissue, and send it for pathological examination.

[0037] Preferably, the baffle 9 used in this embodiment is disc-shaped, which can further prevent the loss of pathological tissue.

[0038] For better, see the attached Figures 1 to 4 As shown, the sleeve body 2 used in this embodiment is a hollow structure, which can accommodate a large amount of pathological tissue.

[0039] For better, see the attached Figures 1 to 4 As shown, the sampling handle 4 used in this embodiment is a solid structure to prevent pathological tissue from entering the sampling handle 4.

[0040] The above description of the disclosed embodiments enables professionals in the field to implement or use the utility model. Various modifications to these embodiments will be apparent to professionals in the field, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the utility model. Therefore, the utility model will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features disclosed herein.

Claims

1. A minimally invasive vertebral tissue biopsy tool, comprising a cannula assembly and a sampling assembly arranged in sequence from the outside to the inside, characterized in that: The sampling assembly comprises a sampling handle (3) and a sampling shaft (4) vertically fixed at the lower end of the sampling handle (3), the sampling shaft (4) passes through the sleeve assembly, a grab head (5) is installed on one end of the sampling shaft (4) passing through the sleeve assembly, and the grab head (5) extends out from the sleeve assembly; The sleeve assembly is threadedly connected to the sampling shaft (4); the sampling shaft (4) moves up and down when rotating; and the grabbing head (5) is driven by the sampling shaft (4) to change shape and / or position.

2. A minimally invasive vertebral tissue biopsy tool according to claim 1, characterized in that: The sleeve assembly comprises a sleeve handle (1) and a sleeve body (2) fixed at the lower end of the sleeve handle (1).

3. A minimally invasive vertebral tissue biopsy tool according to claim 2, characterized in that: The grabbing head (5) is composed of a plurality of steel wires (6), one end of each of the steel wires (6) is fixed to the end of the sampling shaft (4) away from the sampling handle (3), and one end of each of the steel wires (6) is gathered at a point at the end of the sampling handle (3), and the other end is fixed in sequence along the circumferential direction to the end of the cannula body (2) away from the cannula handle (1); When the sampling shaft (4) is rotated upward, the steel wire (6) is stretched out, and when the sampling shaft (4) is rotated downward, the steel wire (6) is straightened.

4. The minimally invasive vertebral tissue biopsy tool according to claim 1, characterized in that: The grabbing head (5) is a spiral head (7), and the rotation direction of the spiral head (7) is opposite to the rotation direction of the threaded connection between the sleeve assembly and the sampling shaft (4).

5. The minimally invasive vertebral tissue biopsy tool according to claim 2, characterized in that: The sleeve body (2) and the sampling shaft (4) are connected via internal and external screws (8).

6. The minimally invasive vertebral tissue biopsy tool according to claim 5, characterized in that: A baffle (9) matched with the inner and outer screws (8) is installed on the sleeve body (2).

7. The minimally invasive vertebral tissue biopsy tool according to claim 6, characterized in that: The baffle (9) is disc-shaped.

8. The minimally invasive vertebral tissue biopsy tool according to claim 2, characterized in that: The sleeve body (2) is a hollow structure.

9. The minimally invasive vertebral tissue biopsy tool according to claim 1, characterized in that: The sampling shaft (4) is a solid structure.

10. The minimally invasive vertebral tissue biopsy tool according to claim 2, characterized in that: The sleeve handle (1) is a T-shaped handle.

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