A cartilage repair gel injection device with cold storage function

Abstract

The utility model belongs to the technical field of medical apparatus and instruments, especially is concerned to a kind of cartilage repair gel operation push-in device with cold storage function.The technology includes syringe body, syringe body includes needle cylinder, fixed tube is independently sleeved on the needle cylinder, a cavity is formed between fixed tube and needle cylinder, first sealing ring that the bottom of cavity is sealed is arranged between the bottom of fixed tube and needle cylinder side wall, second sealing ring that the top of cavity is sealed is arranged between the top of fixed tube and needle cylinder side wall, and injection port for injecting cooling liquid into cavity is arranged on fixed tube.The design is formed cavity by the fixed tube that is sleeved on needle cylinder, the cavity between fixed tube and needle cylinder is sealed by first sealing ring and second sealing ring, the temperature of gel in needle cylinder is controlled by injecting cooling liquid into cavity, the needle cylinder is wrapped by cooling liquid, the temperature of cooling liquid in cavity is conducted from the edge of needle cylinder side wall to middle, and the temperature difference of gel in needle cylinder is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, and in particular relates to a surgical injection device for cartilage repair gel with cold storage function. Background Technology

[0002] With the continuous development of science and technology, a new tissue engineering technology has emerged in the medical field: cartilage repair gel surgery. It uses specific hydrogel materials to repair cartilage damage. The cartilage repair gel needs to have excellent deformation capacity and ultra-high compressive strength to ensure effective stress dissipation and mechanical properties similar to natural cartilage. The surgery usually involves combining in vitro isolated and expanded chondrocytes with growth factors or bioactive substances, and then introducing them into a scaffold to repair the damaged cartilage through surgery or minimally invasive injection.

[0003] Studies have shown that hydrogels prepared at higher temperatures have faster deswelling rates and stronger pulse responsiveness. This suggests that increased temperature may accelerate gel coagulation. During surgery, the injection process takes time, causing the gel to form too quickly, resulting in a mismatch between the outer contour of the formed collagen gel and the damaged area.

[0004] Currently, there is a patent CN217014164U, which includes a fixing base and a booster and injection base that are installed in conjunction with the fixing base. The fixing base has two syringe fixing chambers, and the booster is connected to the plunger end of the syringe. The fixing base also has at least one receiving chamber for containing cooling medium, and the receiving chamber is adjacent to the two syringe fixing chambers. This technical solution achieves temperature control and prolongs gelation time by adding a cold storage agent and / or a refrigerant in the receiving chamber, thereby optimizing the therapeutic effect.

[0005] However, in this technical solution, the receiving cavity for containing the cooling medium and the syringe fixing cavity are only adjacent, and the temperature control effect is achieved through contact. However, in actual use, since the receiving cavity and the syringe fixing cavity are only adjacent, their contact area is limited, and the temperature control effect on the syringe fixing cavity is not good. Moreover, it is easy to cause the temperature of the side in contact with the fixing cavity to be lower, while the temperature of the gel in the fixing cavity on the side away from the receiving cavity is higher. This results in a large temperature difference of the gel in the syringe fixing cavity, which in turn leads to a large deviation in the degree of gel formation and affects the treatment effect. Utility Model Content

[0006] The purpose of this invention is to provide a surgical injection device for cartilage repair gel with a cold storage function, which facilitates the control of the gel temperature in the syringe and reduces the temperature difference of the gel in the syringe.

[0007] The aforementioned cartilage repair gel surgical injection device with cold storage function includes a syringe body, which includes a vertically arranged syringe barrel. A fixing tube is independently sleeved on the syringe barrel, and a cavity is formed between the fixing tube and the syringe barrel.

[0008] A first sealing ring is provided between the bottom of the fixed tube and the side wall of the syringe to seal the bottom of the cavity, and a second sealing ring is provided between the fixed tube and the top of the side wall of the syringe to seal the top of the cavity. The fixed tube is provided with an injection port for injecting cooling liquid into the cavity.

[0009] Furthermore, the fixing tube includes a first fixing tube and a second fixing tube, which are threadedly connected.

[0010] The first sealing ring is disposed between the bottom of the first fixing tube and the side wall of the syringe, and the second sealing ring is disposed between the top of the second fixing tube and the side wall of the syringe.

[0011] Furthermore, a first connecting block with an annular structure is vertically fixed to the top of the first fixed tube, and a second connecting block with an annular structure is fixed to the bottom of the second fixed tube. The outer diameter of the first connecting block is the same as the inner diameter of the second connecting block. The outer side wall of the first connecting block is provided with external threads, and the inner wall of the second connecting block is provided with internal threads.

[0012] Furthermore, a third sealing ring is provided between the first connecting block and the second fixing tube.

[0013] Furthermore, a ring-shaped limiting plate is fixed to the bottom of the first fixing tube, and the inner diameter of the limiting plate is smaller than the outer diameter of the syringe.

[0014] Furthermore, a fourth sealing ring is provided between the limiting plate and the bottom of the syringe.

[0015] Furthermore, a ring-shaped fixing block is horizontally fixed to the top of the second fixing tube, a second sealing ring is fixed to the bottom of the fixing block, and an injection port is opened on the fixing block and the second sealing ring.

[0016] Furthermore, the fixing block is provided with a limiting component to prevent it from moving downward on the syringe.

[0017] Furthermore, the limiting component includes a horizontally arranged first fixing plate, and a second fixing plate that rests on the top of the syringe is horizontally arranged above the first fixing plate. The second fixing plate and the first fixing plate are connected by a vertically arranged connecting plate.

[0018] The first fixing plate has a threaded hole that is open at both ends, and a bolt that is threadedly engaged with the threaded hole is installed in the threaded hole. The liquid injection port on the fixing block has an internal thread that is threadedly engaged with the bolt's screw.

[0019] Furthermore, the first fixing plate, bolt, connecting plate, and second fixing plate are all provided in pairs and are symmetrically distributed.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] This invention creates a cavity by fitting a fixing tube onto a syringe. The cavity between the fixing tube and the syringe is sealed by a first sealing ring and a second sealing ring. Cooling liquid is then injected into the cavity to control the temperature of the gel inside the syringe. The cooling liquid envelops the syringe, causing the temperature of the cooling liquid inside the cavity to be conducted from the edge of the syringe sidewall to the center, thereby reducing the temperature difference of the gel inside the syringe. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 for Figure 1 Enlarged structural diagram at point A;

[0024] Figure 3 for Figure 1 Enlarged structural diagram at point B;

[0025] Figure 4 for Figure 1 Enlarged structural diagram at point C;

[0026] Figure 5 for Figure 1 A front view structural diagram;

[0027] The components in the diagram are named as follows: 1. Syringe; 2. Limiting plate; 3. Fourth sealing ring; 4. First sealing ring; 5. First fixing tube; 6. Second fixing tube; 7. Second sealing ring; 8. Fixing block; 9. First fixing plate; 10. Bolt; 11. Connecting plate; 12. Second fixing plate; 13. First connecting block; 14. Second connecting block; 15. Third sealing ring. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0029] This embodiment describes a surgical injection device for cartilage repair gel with cold storage function, such as... Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, the syringe includes a syringe body, which includes a vertically arranged syringe barrel 1. The syringe body is a pusher used in existing cartilage repair gel surgery. A fixing tube is independently fitted on the syringe barrel 1, and a cavity is formed between the fixing tube and the syringe barrel 1. The cavity has an annular structure. A first sealing ring 4 is provided between the bottom of the fixing tube and the side wall of the syringe barrel 1 to seal the bottom of the cavity. The first sealing ring 4 is fixed to the inner bottom of the fixing tube. The inner diameter of the first sealing ring 4 is the same as the outer diameter of the syringe barrel 1, or the inner diameter of the first sealing ring 4 is slightly smaller than the outer diameter of the syringe barrel 1, so that the first sealing ring 4 is in close contact with the outer wall of the syringe barrel 1. A second sealing ring 7 is provided between the top of the fixing tube and the side wall of the syringe barrel 1 to seal the top of the cavity. The structure of the second sealing ring 7 is the same as the structure of the first sealing ring 4. The side wall of the fixing tube is provided with an injection port for injecting cooling liquid into the cavity. The cooling liquid is a liquid with a relatively low temperature, such as ice water.

[0030] The fixing tube includes a first fixing tube 5 and a second fixing tube 6. The first fixing tube 5 is located at the bottom and the first fixing tube 5 and the second fixing tube 6 are threaded together. A first sealing ring 4 is disposed between the first fixing tube 5 and the bottom of the side wall of the syringe 1, and a second sealing ring 7 is disposed between the second fixing tube 6 and the top of the side wall of the syringe 1. By dividing the fixing tube into the first fixing tube 5 and the second fixing tube 6, during installation, the second fixing tube 6 can be first put on the syringe 1, and then the first fixing tube 5 can be put on the syringe 1. Then, by moving the second fixing tube 6 towards the top of the syringe 1, the first fixing tube 5 and the second fixing tube 6 are separated, so that ice can be placed between the first fixing tube 5 and the syringe 1 to keep the temperature of the cooling liquid for a period of time.

[0031] A first connecting block 13 with an annular structure is vertically fixed to the top of the first fixing tube 5. The inner diameter of the first connecting block 13 is the same as the inner diameter of the first fixing tube 5. A second connecting block 14 with an annular structure is fixed to the bottom of the second fixing tube 6. The outer diameter of the second connecting block 14 is the same as the outer diameter of the second fixing tube 6. The thicknesses of the first fixing tube 5 and the second fixing tube 6 are the same. The thicknesses of the first connecting block 13 and the second connecting block 14 are half the thicknesses of the first fixing tube 5 and the second fixing tube 6. The outer diameter of the first connecting block 13 is the same as the inner diameter of the second connecting block 14. An opening is formed on the outer wall of the first connecting block 13. The first fixing tube 5 and the second fixing tube 6 are connected by the threaded connection of the first fixing tube 13 and the second fixing tube 14. After the first fixing tube 13 and the second fixing tube 14 are connected, the outer walls of the first fixing tube 5 and the second fixing tube 6 are flush. Of course, in some embodiments, the outer diameter of the first fixing tube 5 is the same as the inner diameter of the second fixing tube 6. The outer wall of the top of the first fixing tube 5 is provided with an external thread, and the inner wall of the bottom of the second fixing tube 6 is provided with an internal thread, so that the first fixing tube 5 and the second fixing tube 6 are directly threaded together.

[0032] A third sealing ring 15 is provided between the first connecting block 13 and the second fixing tube 6. The inner diameter of the third sealing ring 15 is the same as the inner diameter of the first connecting block 13, and the outer diameter of the third sealing ring 15 is the same as the outer diameter of the first connecting block 13. After the first connecting block 13 and the second connecting block 14 are connected, the gap between the first connecting block 13 and the second fixing tube 6 can be sealed by the third sealing ring 15, thereby preventing the cooling liquid in the cavity between the first fixing tube 5 and the second fixing tube 6 and the syringe 1 from leaking out from between the first fixing tube 5 and the second fixing tube 6.

[0033] The bottom of the first fixing tube 5 is fixed with a limiting plate 2 in the shape of an annular structure. The inner diameter of the limiting plate 2 is smaller than the outer diameter of the syringe 1. The bottom of the syringe 1 will block the movement of the limiting plate 2, thereby restricting the position of the first fixing tube 5 and the second fixing tube 6.

[0034] A fourth sealing ring 3 is provided between the bottom of the limiting plate 2 and the syringe 1. The inner diameter of the fourth sealing ring 3 is the same as the inner diameter of the limiting plate 2. The fourth sealing ring 3 is fixed to the top of the limiting plate 2. The outer diameter of the fourth sealing ring 3 is the same as the inner diameter of the first fixing tube 5. The fourth sealing ring 3 can also be fixed to the inner side wall of the first fixing tube 5. After the first fixing tube 5 and the second fixing tube 6 are put on the syringe 1, the gap between the limiting plate 2 and the syringe 1 can be sealed by the fourth sealing ring 3, thereby increasing the sealing effect between the bottom of the first fixing tube 5 and the side wall of the syringe 1, that is, increasing the sealing effect at the bottom of the cavity.

[0035] The top of the second fixed tube 6 is horizontally fixed with a fixed block 8 in the shape of an annular structure. The outer diameter of the syringe 1 is smaller than the inner diameter of the fixed block 8. The second sealing ring 7 is fixed at the bottom of the fixed block 8. The injection port is opened on the fixed block 8 and the second sealing ring 7. The injection port is a through hole that connects the top and bottom.

[0036] A first fixing plate 9 is horizontally positioned above the fixing block 8, and a second fixing plate 12 is horizontally positioned above the first fixing plate 9, resting on the top of the syringe 1. To reduce the length of the second fixing plate 12, existing syringes typically have a side plate horizontally fixed to the top of the outer wall of the syringe 1 for finger support, facilitating the push rod movement. The second fixing plate 12 can rest on this side plate. The second fixing plate 12 and the first fixing plate 9 are connected by a vertically positioned connecting plate 11. The first fixing plate 9, connecting plate 11, and second fixing plate 12 form a "U"-shaped structure. The first fixing plate 9 has a threaded hole that runs vertically through it, and a bolt 10 is threaded into the threaded hole. The injection port on the fixing block 8 has an internal thread that threadedly engages with the screw of the bolt 10, and the bolt 10 is threadedly connected to the injection port on the fixing block 8. The first fixing plate 9 is connected to the fixing block 8, and the second fixing plate 12 can control the downward movement of the first fixing plate 9, thereby preventing the first fixing tube 5 and the second fixing tube 6 from moving downward during use. This prevents the first sealing ring 4 from disengaging from the syringe 1 after the first fixing tube 5 and the second fixing tube 6 move downward, thus preventing leakage of cooling liquid in the cavity between the first fixing tube 5 and the second fixing tube 6 and the syringe 1. Moreover, after separating the first fixing plate 9 and the fixing block 8, the bolt 10 can be screwed into the injection port on the fixing block 8, and the bolt 10 can act as a plug for the injection port of the fixing block 8. Of course, in some embodiments, the first fixing plate 9 and the bolt 10 can be omitted, and a connecting tube is sleeved on the outer wall of the second fixing tube 6. The connecting tube and the second fixing tube 6 are threadedly connected, and the second fixing plate 12 is fixed to the connecting tube through the connecting plate 11. This section constitutes the limiting component for preventing the fixing block 8 from moving downward on the syringe 1.

[0037] The first fixing plate 9, bolt 10, connecting plate 11 and the second fixing plate 12 are each provided in two pieces and are symmetrically distributed, so that the force on both sides is even and the downward movement of the first fixing tube 5 and the second fixing tube 6 is better restricted.

[0038] The working principle and technical effects of this embodiment:

[0039] In use, the cartilage repair gel for surgery is drawn into syringe 1 using existing methods. Cooling liquid, such as ice water, is then injected into the cavity between the first fixation tube 5, the second fixation tube 6, and syringe 1. Alternatively, after separating the first and second fixation tubes 5 and 6, small ice cubes are placed between them. The second fixation tube 6 is then connected to the first fixation tube 5, and ice water is injected into the cavity between the first fixation tube 5 and syringe 1 through the injection ports on the fixation block 8 and the second sealing ring 7. This allows for a longer and lower temperature maintenance. Injecting cooling liquid into the cavity between the first and second fixation tubes 5 and syringe 1 allows the cooling liquid to envelop syringe 1, thus better controlling the temperature of the gel within syringe 1. Furthermore, the temperature of the cooling liquid in the cavity is conducted through the side wall of syringe 1 to the center, reducing temperature differences and gel formation variations within syringe 1, facilitating control of the gel's state and ensuring treatment effectiveness. Furthermore, the first fixing tube 5 and the second fixing tube 6 are attached to the syringe 1 by the first sealing ring 4 and the second sealing ring 7. After use, the first fixing tube 5 and the second fixing tube 6 can be removed from the syringe 1 for reuse. Moreover, the structure of the first fixing tube 5, the second fixing tube 6, the second sealing ring 7 and the first sealing ring 4 can be directly applied to the existing cartilage repair gel surgical injector.

Claims

1. A surgical injection device for cartilage repair gel with cold storage function, comprising a syringe body, the syringe body including a vertically arranged syringe barrel (1), characterized in that: A fixing tube is independently fitted onto the syringe (1), and a cavity is formed between the fixing tube and the syringe (1); A first sealing ring (4) is provided between the bottom of the fixed tube and the side wall of the syringe (1) to seal the bottom of the cavity, and a second sealing ring (7) is provided between the fixed tube and the top of the side wall of the syringe (1) to seal the top of the cavity. A liquid injection port for injecting cooling liquid into the cavity is provided on the fixed tube.

2. The surgical injection device for cartilage repair gel with cold storage function according to claim 1, characterized in that: The fixing tube includes a first fixing tube (5) and a second fixing tube (6), and the first fixing tube (5) and the second fixing tube (6) are threaded together; The first sealing ring (4) is disposed between the bottom of the first fixing tube (5) and the side wall of the syringe (1), and the second sealing ring (7) is disposed between the top of the second fixing tube (6) and the side wall of the syringe (1).

3. The surgical injection device for cartilage repair gel with cold storage function according to claim 2, characterized in that: The top of the first fixed tube (5) is vertically fixed with a first connecting block (13) in a ring structure, and the bottom of the second fixed tube (6) is fixed with a second connecting block (14) in a ring structure. The outer diameter of the first connecting block (13) is the same as the inner diameter of the second connecting block (14). The outer wall of the first connecting block (13) is provided with an external thread, and the inner wall of the second connecting block (14) is provided with an internal thread.

4. The surgical injection device for cartilage repair gel with cold storage function according to claim 3, characterized in that: A third sealing ring (15) is provided between the first connecting block (13) and the second fixing tube (6).

5. The surgical injection device for cartilage repair gel with cold storage function according to claim 4, characterized in that: The bottom of the first fixed tube (5) is fixed with a ring-shaped limiting plate (2), the inner diameter of which is smaller than the outer diameter of the syringe (1).

6. The surgical injection device for cartilage repair gel with cold storage function according to claim 5, characterized in that: A fourth sealing ring (3) is provided between the bottom of the limiting plate (2) and the syringe (1).

7. The surgical injection device for cartilage repair gel with cold storage function according to claim 6, characterized in that: The top of the second fixed tube (6) is horizontally fixed with a fixed block (8) in a ring structure, and the second sealing ring (7) is fixed at the bottom of the fixed block (8). The injection port is opened on the fixed block (8) and the second sealing ring (7).

8. The surgical injection device for cartilage repair gel with cold storage function according to claim 7, characterized in that: The fixing block (8) is provided with a limiting component to prevent it from moving downward on the syringe (1).

9. The surgical injection device for cartilage repair gel with cold storage function according to claim 8, characterized in that: The limiting component includes a horizontally arranged first fixing plate (9), and a second fixing plate (12) is horizontally arranged above the first fixing plate (9) and rests on the top of the syringe (1). The second fixing plate (12) and the first fixing plate (9) are connected by a vertically arranged connecting plate (11). The first fixing plate (9) has a threaded hole that is open to the top and bottom. A bolt (10) is installed in the threaded hole and is threaded to it. The liquid injection port on the fixing block (8) has an internal thread that is threaded to the screw of the bolt (10).

10. The surgical injection device for cartilage repair gel with cold storage function according to claim 9, characterized in that: The first fixing plate (9), bolt (10), connecting plate (11) and the second fixing plate (12) are each provided in two pieces and are symmetrically distributed.

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