Bone marrow cavity suction tube and pedicle screw set

Abstract

The application discloses a bone marrow cavity liquid suction tube and a pedicle screw kit. The bone marrow cavity liquid suction tube comprises a tube body, a liquid suction head arranged at one end of the tube body, a liquid suction port and a liquid outlet port arranged on the liquid suction head, a channel arranged in the liquid suction head and communicating with the liquid suction port and the liquid outlet port, the liquid outlet port being in communication with an inner chamber of the tube body, the tube body and the outer wall of the liquid suction head being sealed from each other, and a liquid outlet hole being arranged on the side wall of the tube body. The bone marrow cavity liquid suction tube further comprises a driving part configured to drive the liquid suction head to switch between a first position and a second position. When the liquid suction head is located at the first position, the channel is open. When the liquid suction head is located at the second position, the channel is closed. According to the bone marrow cavity liquid suction tube, when the liquid suction tube is used to suck liquid, the liquid suction head is driven to the first position, and the channel between the liquid suction port and the liquid outlet port is open at this time. When it is required to release the blood in the tube body, the liquid suction head is driven to the second position, the channel between the liquid suction port and the liquid outlet port is closed, and the blood can only flow out of the liquid outlet hole. Therefore, the blood in the bone marrow cavity does not need to be sucked for multiple times, and the bone marrow cavity liquid suction tube is convenient to use.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and more particularly to a medullary cavity aspiration tube and pedicle screw kit. Background Technology

[0002] Pedicle screws are the most essential and commonly used internal fixation implants in spinal surgery. They act like "steel bars" to fix and stabilize the spine, and are mainly used in lumbar spine surgery.

[0003] In existing pedicle screws, the screw typically has multiple crystal lattices, and an aspiration channel is provided through the screw head and tail. After the pedicle screw is implanted into the spine, the tip of the screw is inserted into the medullary cavity. Then, using a syringe, the needle is inserted through the aspiration channel to aspirate blood containing stem cells from the medullary cavity. After a certain amount of blood is aspirated, the blood is released into the pedicle screw. The blood containing stem cells flows into the crystal lattice within the pedicle screw, eventually contacting the inner wall of the bone foramen that holds the screw in place. The stem cells in the blood differentiate, facilitating new bone ingrowth into the crystal lattice, thus ensuring a firm connection between the pedicle screw and the vertebral column.

[0004] However, using a syringe to release blood has a major drawback: a large amount of blood flows back into the bone marrow cavity through the aspiration channel. Therefore, in clinical practice, it is necessary to aspirate and release blood from the bone marrow cavity multiple times to ensure that a sufficient amount of blood can enter the crystal lattice, making the procedure cumbersome. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention discloses a medullary cavity aspiration tube and pedicle screw kit, which is simple to operate.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] A bone marrow cavity aspiration tube includes a tube body and an aspiration head disposed at one end of the tube body. The aspiration head has an aspiration port and an outlet. The aspiration head has a channel communicating with the aspiration port and the outlet. The outlet communicates with the internal cavity of the tube body. The tube body and the outer wall of the aspiration head are sealed to each other. The side wall of the tube body has an outlet hole. The tube body also includes a driving part for switching the aspiration head between a first position and a second position. When the aspiration head is in the first position, the channel is open; when the aspiration head is in the second position, the channel is closed.

[0008] Furthermore, the channel has a blocking part. When the suction head is in the first position, there is a gap between the blocking part and the inner wall of the channel; when the suction head is in the second position, the blocking part abuts against the inner wall of the channel and closes the channel.

[0009] Furthermore, when the suction head (2) is in the second position, compared to its state in the first position, the suction head is compressed and deformed, and the radial cross-sectional area of ​​the channel is reduced.

[0010] Furthermore, the blocking part is disposed on the inner wall of the channel.

[0011] Furthermore, the blocking part is a flexible flap, which is configured such that when the medullary cavity aspiration tube aspirates fluid, the end of the flexible flap away from the channel moves toward the inner wall of the channel.

[0012] Furthermore, in the first position, the suction head abuts against the end of the tube body; in the second position, the suction head enters the tube body.

[0013] Furthermore, the driving unit includes a pulling member connected to the suction head, and the tube wall of the tube body is provided with a through hole for the pulling member to pass through.

[0014] Furthermore, when the suction head is in the first position, the suction port is located outside the tube body, and the suction port is serrated.

[0015] Furthermore, the outer wall of the tube is provided with a spiral groove, which communicates with the liquid outlet.

[0016] A pedicle screw kit includes a pedicle screw and any of the above-described medullary cavity aspiration tubes. The pedicle screw has a first channel and a second channel penetrating the head and tail of the pedicle screw. The first channel communicates with the second channel and extends to the side wall of the pedicle screw. The second channel allows the medullary cavity aspiration tube to pass through.

[0017] Compared with existing technologies, the advantages of this invention are as follows: When the pedicle screw kit is used, the pedicle screw is fixed to the vertebrae, the aspiration head extends into the medullary cavity, and the tube is located in the second channel of the pedicle screw. Through the arrangement of the tube and aspiration head, when the medullary cavity aspiration tube is used, the aspiration head is driven to the first position, at which point the channel between the aspiration port and the outlet is open, allowing blood from the medullary cavity to enter the tube through the aspiration port, channel, and outlet. When it is necessary to release blood from the tube, the aspiration head is driven to the second position, at which point the channel between the aspiration port and the outlet is closed, and blood can only flow out from the outlet hole on the tube, flowing into the first channel of the pedicle screw, which helps new bone ingrowth into the first channel. Therefore, almost no blood flows back into the medullary cavity, eliminating the need for repeated aspiration of blood from the medullary cavity, making it convenient to use. Attached Figure Description

[0018] Figure 1This is a schematic diagram of the axial cross-section of the pedicle screw of the present invention;

[0019] Figure 2 This is a three-dimensional schematic diagram of the bone marrow cavity aspiration tube of the present invention;

[0020] Figure 3 This is a front view of the bone marrow cavity aspiration tube of the present invention;

[0021] Figure 4 yes Figure 3 A sectional view of section AA in the middle;

[0022] Figure 5 This is a three-dimensional schematic diagram of the suction head of the present invention;

[0023] Figure 6 This is a schematic diagram of the suction head of the present invention in the first position;

[0024] Figure 7 This is a schematic diagram of the suction head of the present invention in the second position;

[0025] Figure 8 yes Figure 4 Enlarged schematic diagram of section B.

[0026] In the picture:

[0027] 1 – Tube body; 1a – Liquid outlet; 1b – Spiral groove; 1c – Protruding ring; 2 – Suction head; 2a – Suction port; 2b – Liquid outlet; 2c – Channel; 2d – Flexible flap; 3 – Traction component; 4 – Pedicle screw; 4a – First channel; 4b – Second channel. Detailed Implementation

[0028] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0031] To facilitate the extraction of stem cell-containing blood from the medullary cavity and its injection into the channel within the pedicle screw, thereby promoting new bone ingrowth into the channel and facilitating fixation of the pedicle screw to the vertebral bone, this invention discloses a pedicle screw kit, such as... Figure 1 and Figure 2 As shown, this includes a medullary cavity aspiration tube and four pedicle screws. Details:

[0032] For bone marrow cavity aspiration tubes:

[0033] like Figures 3 to 5 As shown, the bone marrow cavity aspiration tube includes a tube body 1 and an aspiration head 2 located at one end of the tube body 1. The aspiration head 2 has an aspiration port 2a and an outlet 2b, and a channel 2c connecting the aspiration port 2a and the outlet 2b is provided inside the aspiration head 2. The outlet 2b communicates with the internal cavity of the tube body 1, and the tube body 1 and the outer wall of the aspiration head 2 are sealed to each other, that is, the connection between the tube body 1 and the aspiration head 2 is sealed (there are various sealing methods, such as the tube body 1 tightly wrapping the aspiration head 2, or the outer wall of the aspiration head 2 abutting one end of the tube body 1, or the connection between the tube body 1 and the aspiration head 2 being sealed by a corrugated tube). The internal cavity of the tube body 1 and the channel 2c in the aspiration head 2 are connected only through the outlet 2b. The side wall of the tube body 1 has an outlet hole 1a, which is a channel connecting the internal cavity of the tube body 1 and the external space of the tube body 1, that is, the liquid in the internal cavity of the tube body 1 can flow to the outside of the tube body 1 through the outlet hole 1a.

[0034] The bone marrow cavity aspiration tube of the present invention also includes a drive unit for switching the aspiration head 2 between a first position and a second position.

[0035] When the drive unit drives the suction head 2 to the first position, the channel 2c is opened. That is, when a suction force is applied to the end of the tube body 1 away from the suction head 2, the liquid can enter the internal chamber of the tube body 1 in sequence through the suction port 2a, the channel 2c, and the outlet 2b.

[0036] When the drive unit drives the suction head 2 to the second position, the channel 2c is closed. That is, at this time, the liquid in the internal chamber of the tube body 1 cannot flow from the outlet 2b to the suction port 2a, and the liquid in the internal chamber of the tube body 1 can only flow from the outlet 1a to the outside of the tube body 1.

[0037] For pedicle screw 4:

[0038] like Figure 1 As shown, the pedicle screw 4 has a first channel 4a and a second channel 4b that connects the head and tail of the pedicle screw 4. The first channel 4a connects to the second channel 4b and extends to the side wall of the pedicle screw 4. The second channel 4b allows the medullary cavity aspiration tube to pass through. Preferably, the axis of the second channel 4b is the same as the axis of the pedicle screw 4. There are several first channels 4a, which are evenly distributed around the second channel 4b. A fluid guiding element is provided in the first channel 4a. One end of the fluid guiding element is located close to the second channel 4b, and the other end of the fluid guiding element extends out of the first channel 4a and extends to the outside of the pedicle screw 4. The fluid guiding element is mesh-like, and the mesh-like fluid guiding element can be an electrospun mesh made of polylactic acid-glycolic acid copolymer (PLGA).

[0039] The steps for using the pedicle screw kit of the present invention are as follows:

[0040] Step 1: Drill the pedicle screw 4 into the pre-designed bone hole in the vertebral bone. Bone fragments formed during the drilling process enter the first channel 4a and are caught by the mesh-like fluid guide. The fluid guide extending outward from the outside of the pedicle screw 4 holds against the inner wall of the bone hole, and the tip of the pedicle screw 4 drills into the medullary cavity, which is connected to the second channel 4b.

[0041] Step 2: Drive the bone marrow cavity aspiration tube into the second channel 4b, with the aspiration head 2 entering the second channel 4b before the tube body 1; finally, drive the aspiration head 2 into the bone marrow cavity, while the tube body 1 is located inside the second channel 4b.

[0042] Step 3: The drive unit drives the suction head 2 to the first position, and the external suction device is used to aspirate the end of the tube body 1 away from the suction head 2. The blood containing stem cells in the bone marrow cavity is aspirated into the tube body 1. At this time, because the external suction device is providing suction, the blood in the tube body 1 will not flow out of the outlet hole 1a.

[0043] Step 4: After the set dose of blood is drawn from tube 1, the suction of the external suction device is removed, and the driving unit drives the suction head 2 to the second position. At this time, since the channel 2c is closed, the blood in the internal chamber of tube 1 can only flow out of tube 1 through the outlet hole 1a. Since tube 1 is located in the second channel 4b at this time, the blood flowing out of tube 1 will enter the second channel 4b and eventually enter the first channel 4a.

[0044] Step 5: After the blood containing stem cells has fully come into contact with the inner wall of the bone hole, the medullary cavity aspiration tube is pulled out from the second channel 4b, while the pedicle screw 4 remains in the body. Over time, with the aid of the fluid-conducting device, blood containing stem cells is conducted to the sidewall of the bone hole. Bone fragments in the first channel 4a also come into contact with the blood containing stem cells. Stem cells differentiate and form new bone outside the bone fragments. The differentiation of stem cells induces new bone to grow from the sidewall of the bone hole along the fluid-conducting device into the first channel 4a. The new bone formed outside the bone fragments and the new bone growing from the sidewall of the bone hole eventually grow together, so that the first channel 4a is filled with new bone, thereby making the bone hole and the pedicle screw 4 firmly connected. (Without the fluid-conducting device, some blood containing stem cells will also come into contact with the sidewall of the bone hole, but during the process of new bone growing from the sidewall of the bone hole into the first channel 4a, the effect is worse than when the fluid-conducting device is used because there is no fluid-conducting device to guide it. However, if the fluid-conducting device is used, the first channel 4a can also be a channel composed of crystal lattices, that is, the pedicle screw 4 has many crystal lattices, and some crystal lattices have fluid-conducting devices to form the first channel 4a. At this time, blood containing stem cells will also enter other crystal lattices without fluid-conducting devices, promoting bone ingrowth.)

[0045] The pedicle screw kit of the present invention, through the arrangement of the tube body 1 with the outlet hole 1a and the suction head 2, when the suction head 2 is driven to the second position, at this time due to the closure of the channel 2c, most of the blood in the tube body 1 flows from the outlet hole 1a into the second channel 4b of the pedicle screw 4. Blood containing stem cells can easily enter the first channel 4a, and almost no blood can flow back into the bone marrow cavity, eliminating the need for repeated aspiration of blood from the bone marrow cavity, making it convenient to use.

[0046] In the pedicle screw kit of the present invention, many technical features, such as the detailed structure of the tube body 1 and the detailed structure of the suction head 2, have multiple implementations. Below, for each of these technical features, including the detailed structure of the tube body 1, one implementation will be selected for detailed description. This embodiment is referred to as "this embodiment." Other implementations of the detailed structure of the tube body 1 and other features are referred to as "other embodiments," which will be briefly described below.

[0047] In this embodiment, as Figure 4As shown, channel 2c has a blocking part, which can be attached to the inner wall of channel 2c or suspended in channel 2c. The blocking part is connected to a connector, which passes through the outlet 2b and is connected to the inner wall of tube 1. When the driving unit drives the suction head 2 to the first position, there is a gap between the blocking part and the inner wall of channel 2c, that is, the blocking part does not block channel 2c, and the suction port 2a and the outlet 2b are connected. When the driving unit drives the suction head 2 to the second position, the blocking part abuts against the inner wall of channel 2c and closes channel 2c, and the suction port 2a and the outlet 2b are separated by the blocking part. The outer wall of the suction head 2 can be flexible and deformable, and the blocking part can also be flexible. When the suction head 2 is in the second position relative to when it is in the first position, the suction head 2 is squeezed and deformed, the radial cross-sectional area of ​​channel 2c decreases, and although the blocking part is flexible and deformable, it can still block channel 2c. Of course, the outer wall of the suction head 2 can also be non-deformable, and the blocking part can also be non-deformable. In this case, the inner diameter of the channel 2c needs to be different at different locations, the blocking part needs to be suspended inside the channel 2c, and the inner diameter of the channel 2c in the second position is smaller than that in the second position. Furthermore, the end of the tube 1 that contacts the suction head 2 needs to be flexible, and the inner wall of the tube 1 abuts against the outer wall of the suction head 2. When the driving unit drives the suction head 2 to switch between the first and second positions, the end of the tube 1 near the suction head 2 is fitted over the suction head 2 and moves on the outer wall of the suction head 2. This invention, through the setting of the blocking part, makes it easier to close the channel 2c in the second position of the suction head 2. In other embodiments, the blocking part may not be provided. In this case, the suction head 2 needs to be flexible. When the suction head 2 is in the second position, the suction head 2 is compressed and deformed, and the opposite sides of the inner wall of the channel 2c come into contact, thus closing the channel 2c.

[0048] In this embodiment, preferably, when the suction head 2 is in the second position, compared to its state in the first position, the suction head 2 is compressed and deformed, and the radial cross-sectional area of ​​the channel 2c is reduced. That is, a flexible deformation design for the suction head 2 is preferred. In other embodiments, as described above, both the suction head 2 and the blocking part are not easily deformable. This invention, by setting the suction head 2 to be flexible, makes it less likely to damage human tissue during the process of the medullary cavity suction tube entering the human body.

[0049] In this embodiment, as Figure 4 As shown, the blocking part is disposed on the inner wall of the channel 2c. In this case, the suction head 2 can be flexible and deformable, and the blocking part and the suction head 2 can be integrally injection molded for easy production. In other embodiments, as described above, the blocking part can also be suspended in the channel 2c. In other embodiments, the suction head 2 can be flexible and deformable, while the blocking part can be made of a non-deformable material.

[0050] In this embodiment, as Figure 6 and Figure 7 As shown, the blocking part is a flexible flap 2d. The flexible flap 2d is configured such that, during aspiration of fluid from the medullary cavity vial, the end of the flexible flap 2d away from the channel 2c moves towards the inner wall of the channel 2c. The flexible flap 2d is generally petal-shaped, and its arc-shaped opening faces away from the outlet 2b. More details... Figure 6 In this invention, the flexible valve 2d is positioned with the suction head 2 in the first position and the medullary cavity suction tube in the blood-drawing state. At this time, the blood flowing in the channel 2c facilitates the movement of the arc-shaped opening of the flexible valve 2d, pushing the end of the flexible valve 2d away from the inner wall of the channel 2c towards the inner wall, allowing more blood to pass through the channel 2c. When the driving part drives the suction head 2 to the second position, as the radial cross-sectional area of ​​the channel 2c decreases, the end of the flexible valve 2d away from the inner wall of the channel 2c abuts against the inner wall of the channel 2c, completely blocking the channel 2c. By setting the blocking part as the flexible valve 2d, this invention ensures that the flexible valve 2d does not obstruct blood flow in the channel 2c as much as possible during blood aspiration using the medullary cavity suction tube. In other embodiments, a structure similar to the mitral or tricuspid valve in aortic replacement valves can also be provided in the channel 2c, but it is necessary to ensure that there is a gap between the tips of the mitral or tricuspid valves when the suction head 2 is in the first position.

[0051] In this embodiment, as Figure 4 As shown, the tube body 1 is made of a non-deformable material. When the suction head 2 is in the first position, it abuts against the end of the tube body 1, and the suction port 2a is located outside the tube body 1. Under normal conditions, the maximum outer diameter of the suction head 2 is greater than the inner diameter of the tube body 1. When the suction head 2 is in the second position, it enters the tube body 1 and deforms under the pressure of the tube body 1, reducing the radial cross-sectional area of ​​the channel 2c. This invention, by setting the suction head 2 to be outside the tube body 1 in the first position, ensures that the bone marrow cavity aspiration tube is not under compression deformation most of the time during use, effectively guaranteeing the service life of the bone marrow cavity aspiration tube. In other embodiments, the suction head 2 can also be set to always be inside the tube body 1, always abutting against the inner wall of the tube body 1, with the suction port 2a exposed outside the tube body 1, and the inner diameter of the tube body 1 is smaller when the suction head 2 is in the second position than when the suction head 2 is in the second position. Simultaneously, the blocking part can be a non-deformable component suspended within the channel 2c.

[0052] In this embodiment, as Figure 5 and Figure 8As shown, the driving unit includes a pulling member 3, which is connected to the suction head 2. The tube wall of the tube body 1 has a through hole for the pulling member 3 to pass through. The driving unit also includes a pulling drive member fixed to the tube body 1, which is connected to the pulling member 3 and drives the pulling member 3 to move. When the pulling drive member drives the pulling member 3 to move away from the suction head 2, the suction head 2 can move from a first position to a second position. The pulling member 3 can be a metal wire or a plastic rod. This invention facilitates the movement of the pulling member 3 by providing a through hole in the tube wall of the tube body 1 for the pulling member 3 to pass through and by using a concealed design for the pulling member 3. In other embodiments, the pulling member 3 can also be disposed on the inner side of the inner wall of the tube body 1.

[0053] In this embodiment, as Figure 4 As shown, the suction head 2 is olive-shaped, with its tip entering the tube body 1. By designing the suction head 2 in an olive shape, this invention facilitates its insertion into the second channel 4b and into the bone marrow cavity, while also allowing it to be pulled into the tube body 1 by the drive unit and undergo compression deformation. In other embodiments, the suction head 2 may also be spherical.

[0054] In this embodiment, as Figure 8 As shown, the tube body 1 includes a main tube and a protruding ring 1c disposed at one end of the main tube near the suction head 2. A through hole is disposed on the main tube, and the protruding ring 1c cooperates with the main tube to form a stepped surface. When the suction head 2 is in the first position, the outer wall of the suction head 2 abuts against the protruding ring 1c, and the pulling member 3, which connects to the suction head 2 and extends out of the through hole, is located inside the protruding ring 1c. This invention, through the provision of the protruding ring 1c, completely conceals the pulling member 3, which connects to the suction head 2 and extends out of the through hole, preventing this part of the pulling member 3 from causing harm to the human body due to exposure. In other embodiments, when the pulling member 3 is disposed within the internal cavity of the tube body 1, the protruding ring 1c may not be provided.

[0055] In this embodiment, as Figure 5 As shown, when the suction head 2 is in the first position, the suction port 2a is located outside the tube body 1. The suction port 2a is serrated and is located on the side wall of the olive-shaped suction head 2. By setting the suction port 2a in a serrated shape, the present invention allows for scraping of the bone marrow cavity before blood is drawn from the cavity by rotating or moving the bone marrow cavity suction tube. Firstly, scraping away bone marrow matrix and other substances within the bone marrow cavity widens the passageway, facilitating the extraction of large amounts of blood containing stem cells. Secondly, during the implantation of the pedicle screw 4, some bone fragments may fall into the bone marrow cavity. The scraping action of the suction port 2a can reduce the size of these fragments, allowing them to be drawn into the tube body 1 and flow into the first channel 4a with the blood. In other embodiments, the suction port 2a may also be circular, rectangular, or other shapes.

[0056] In this embodiment, as Figure 5 As shown, a metal sheet is provided at the opening of the suction port 2a, and the suction head 2, together with the flexible flap 2d, is integrally injection molded using polyether block polyamide thermoplastic elastomer or other highly elastic injection molding materials. The metal sheet in this invention helps to improve the scraping effect of the suction port 2a. In other embodiments, the metal sheet may not be provided.

[0057] In this embodiment, as Figure 5 As shown, the suction port 2a extends to the tip of the suction head 2 on the side away from the tube body 1. Therefore, blood in the bone marrow cavity is more easily aspirated into the tube body 1, and the suction head 2 is more easily deformed by compression. In other embodiments, the suction head 2 may also be positioned only at the tip of the suction head 2 on the side away from the tube body 1.

[0058] In this embodiment, as Figure 2 As shown, the outer wall of the tube body 1 is provided with a spiral groove 1b, which communicates with the outlet hole 1a. Since the first channels 4a are evenly distributed around the second channels 4b, the spiral groove 1b guides the blood flowing out of the outlet hole 1a into each of the first channels 4a. In other embodiments, the spiral groove 1b may not be provided, but in this case, a corresponding outlet hole 1a needs to be provided at the corresponding first channel 4a.

[0059] In this embodiment, as Figure 1 and Figure 3 As shown, since each first channel 4a is usually also arranged along the axial direction of the pedicle screw 4, several outlet holes 1a are usually provided, and each outlet hole 1a is arranged sequentially along the axial direction of the tube body 1. The diameter of each outlet hole 1a increases sequentially in the direction away from the suction head 2. This is because, usually during the operation of the medullary cavity aspiration tube, the axis of the tube body 1 is arranged along the direction of gravity. Therefore, under the action of gravity, the blood pressure near the suction head 2 in the tube body 1 is greater than the blood pressure away from the suction head 2. Therefore, the different diameters of each outlet hole 1a are designed so that the flow rate of blood flowing out of each outlet hole 1a is approximately the same, which facilitates that the amount of blood entering each first channel 4a is approximately the same.

[0060] In summary, the pedicle screw kit of the present invention, through the configuration of the tube body 1 with a fluid outlet 1a and the suction head 2, ensures that when the suction head 2 is in the second position, almost no blood flows back into the bone marrow cavity, eliminating the need for repeated blood aspiration from the bone marrow cavity, thus making it convenient to use. Furthermore, the blocking part makes it easier to close the channel 2c when the suction head 2 is in the second position. The flexible deformable design of the suction head 2 minimizes the risk of damaging human tissue during the insertion of the bone marrow cavity suction tube into the body. The blocking part is located on the inner wall of the channel 2c, and the blocking part and the suction head 2 can be integrally injection molded, facilitating production. The flexible flap 2d of the blocking part minimizes obstruction of blood flow in the channel 2c. The suction head 2 being located outside the tube body 1 in the first position effectively ensures the service life of the bone marrow cavity suction tube. The concealed design of the traction member 3 facilitates its movement. The olive-shaped design of the suction head 2 facilitates its entry into the bone marrow cavity and the tube body 1. The protruding ring 1c completely conceals the traction member 3, which connects to the suction head 2 and extends into the through hole. The serrated suction port 2a facilitates scraping of the bone marrow cavity. The metal plate enhances the scraping effect of the suction port 2a. The extension of the suction port 2a to the tip of the suction head 2 away from the tube body 1 facilitates blood aspiration and the deformation of the suction head 2. The spiral groove 1b facilitates blood drainage into each of the first channels 4a. The diameter of each outlet hole 1a increases sequentially in the direction away from the suction head 2, ensuring that the blood flow rate from each outlet hole 1a is approximately the same.

[0061] It should be emphasized that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A bone marrow cavity aspiration tube, characterized in that, The device includes a tube body (1) and a suction head (2) disposed at one end of the tube body (1). The suction head (2) is provided with a suction port (2a) and a discharge port (2b). The suction head (2) is provided with a channel (2c) connecting the suction port (2a) and the discharge port (2b). The discharge port (2b) is connected to the internal chamber of the tube body (1). The tube body (1) and the outer wall of the suction head (2) are sealed to each other. The side wall of the tube body (1) is provided with a discharge hole (1a). It also includes a drive unit that drives the suction head (2) to switch between a first position and a second position. When the suction head (2) is in the first position, the channel (2c) is open; when the suction head (2) is in the second position, the channel (2c) is closed. The channel (2c) has a blocking part. When the suction head (2) is in the first position, there is a gap between the blocking part and the inner wall of the channel (2c). When the suction head (2) is in the second position, the blocking part abuts against the inner wall of the channel (2c) and closes the channel (2c). When the suction head (2) is in the second position, compared to its state in the first position, the suction head (2) is squeezed and deformed, and the radial cross-sectional area of ​​the channel (2c) is reduced.

2. The bone marrow cavity aspiration tube according to claim 1, characterized in that, The blocking part is disposed on the inner wall of the channel (2c).

3. The bone marrow cavity aspiration tube according to claim 2, characterized in that, The blocking part is a flexible flap (2d), which is configured such that when the medullary cavity aspiration tube aspirates fluid, the end of the flexible flap (2d) away from the channel (2c) moves toward the inner wall of the channel (2c).

4. The bone marrow cavity aspiration tube according to claim 1, characterized in that, In the first position, the suction head (2) abuts against the end of the tube body (1); in the second position, the suction head (2) enters the tube body (1).

5. The bone marrow cavity aspiration tube according to claim 4, characterized in that, The driving unit includes a pulling member (3), which is connected to the suction head (2). The tube wall of the tube body (1) is provided with a through hole for the pulling member (3) to pass through.

6. The bone marrow cavity aspiration tube according to claim 1, characterized in that, When the suction head (2) is in the first position, the suction port (2a) is located outside the tube body (1), and the suction port (2a) is serrated.

7. The bone marrow cavity aspiration tube according to claim 1, characterized in that, The outer wall of the tube (1) is provided with a spiral groove (1b), which is connected to the liquid outlet (1a).

8. A pedicle screw kit, characterized in that, The device includes a pedicle screw (4) and a medullary cavity aspiration tube as described in any one of claims 1 to 7. The pedicle screw (4) has a first channel (4a) and a second channel (4b) that passes through the head and tail of the pedicle screw (4). The first channel (4a) communicates with the second channel (4b) and the first channel (4a) extends to the side wall of the pedicle screw (4). The second channel (4b) is through which the medullary cavity aspiration tube passes.

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