CN115554518B - A subcutaneous drug delivery device for preoperative chemotherapy - Google Patents

Abstract

The present invention belongs to the technical field of medical devices, and specifically relates to a subcutaneous drug delivery device for preoperative chemotherapy, which includes a port body, a locking mechanism and an anti-backflow mechanism. A silicone diaphragm is installed inside the upper end of the port body, a buckle is installed on the upper end of the port body and on the outside of the silicone diaphragm, a catheter is installed on one side of the port body, and the locking mechanism is arranged on the outside of the catheter. In this invention, when injecting drug liquid into the port body, the catheter is limited to the port body through the design of the locking mechanism, avoiding the loosening of the connection between the port body and the catheter due to the high instantaneous pressure of the drug liquid injected into the port body, thereby ensuring the stability of the connection between the port body and the catheter; when injecting drug liquid into the port body, the anti-backflow mechanism is designed to allow the drug liquid to flow into the patient's body through the anti-backflow mechanism. If backflow occurs, it can be intercepted by the anti-backflow mechanism to ensure the supply of drug liquid.

Description

A subcutaneous drug delivery device for preoperative chemotherapy

Technical Field

The invention belongs to the technical field of medical devices, and in particular relates to a subcutaneous drug delivery device for preoperative chemotherapy.

Background technique

Subcutaneous drug administration is a drug administration method that delivers drugs locally or systemically through the skin through subcutaneous capillaries to achieve disease treatment. It can be used for patients with diabetes, allergic skin diseases, mental illnesses such as epilepsy, cardiovascular diseases, cancer chemotherapy, etc. who need long-term, repeated infusions. Since subcutaneous drug administration can bypass the first-pass effect of the liver and does not damage the gastrointestinal tract, it can minimize the attenuation of drug concentration, reduce toxic side effects, and improve the efficiency of drug use. Therefore, subcutaneous drug administration is often used during preoperative chemotherapy. It is used for infusion of various high-concentration chemotherapy drugs, parenteral nutrition solutions, blood transfusions, repeated blood draws, etc. It can reduce the pain of repeated punctures, prevent drug damage to peripheral blood vessels, and effectively protect peripheral blood vessels. It is widely used in clinical practice.

At present, when the subcutaneous drug delivery device used for preoperative chemotherapy is filled with drug liquid, the port body and the catheter will be subjected to a large impact force due to the high instantaneous pressure in the port body. Since the connection between the port body and the catheter is generally assembled for the convenience of manufacturing and processing, when the instantaneous pressure in the port body increases, it is easy to cause the connection strength between the port body and the catheter to deviate, and even there is a risk of falling off, endangering the life and health of the patient. In addition, when the drug liquid enters the human vein through the catheter, the drug liquid sometimes refluxes, which not only affects the supply of drug liquid and reduces the effect of chemotherapy, but also causes certain harm to the body itself.

For example, a Chinese patent, publication number CN212651172U, discloses an infusion port. This technology uses a connecting tube to connect the port body and the catheter, and ensures direct flow during the infusion process, and the medical active substance will not remain in the liquid storage cavity; and the inclined setting of the liquid storage cavity and the silicone, combined with the straight non-destructive needle, is conducive to the operation and use by medical staff. However, in fact, it does not have a better way to fix the catheter, and does not propose a means to prevent the reflux of the drug liquid.

Summary of the invention

The purpose of the present invention is to provide a subcutaneous drug delivery device for preoperative chemotherapy, which effectively strengthens the fixation between the catheter and the port body, improves the stability of the connection between the two, avoids separation of the two, ensures safety, and at the same time, prevents the phenomenon of drug liquid reflux.

The technical solution adopted by the present invention is as follows:

A subcutaneous drug delivery device for preoperative chemotherapy, comprising:

A port body, wherein a silicone diaphragm is installed inside the upper end of the port body, and a catheter is installed on one side of the port body;

A locking mechanism, which is arranged on the outside of the catheter and is used to fix the catheter on the port body;

The anti-backflow mechanism is arranged inside the end of the catheter away from the port body, and is used to prevent the drug solution from flowing back inside the catheter.

In a preferred embodiment, the silicone diaphragm is convex, a groove matching the silicone diaphragm is formed inside the port body, and the diameter of the silicone diaphragm is larger than the diameter of the groove.

In a preferred embodiment, an annular space is provided between the interior of the groove and the silicone diaphragm, a positioning member is installed inside the annular space, the positioning member includes a magnetic ring and a spring a, the magnetic ring is provided inside the annular space, and the spring a is also provided inside the annular space and located above the magnetic ring.

In a preferred embodiment, the locking mechanism includes a truncated cone tube and a truncated cone ring. The truncated cone tube is arranged inside the catheter at one end of the port body, and the truncated cone ring is arranged outside the catheter and close to the truncated cone tube.

In a preferred embodiment, the inner diameter of the upper base of the truncated cone ring is smaller than the outer diameter of the lower base of the truncated cone tube, and the inner diameter of the upper base of the truncated cone ring is larger than the outer diameter of the upper base of the truncated cone tube.

In a preferred embodiment, the locking mechanism includes a truncated cone-shaped fixing tube and a locking cap, wherein the truncated cone-shaped fixing tube is fixed on one side of the port body, the catheter is plugged into the outside of the truncated cone-shaped fixing tube, and the locking cap is arranged on the outside of the catheter and close to the truncated cone-shaped fixing tube, and the locking cap is threadedly connected to the truncated cone-shaped fixing tube.

In a preferred embodiment, the backflow prevention mechanism includes a first fixing frame, a first connecting frame, a conical piece and a first plug ring, the first fixing frame is fixed to the inside of the end of the catheter away from the port body, the first connecting frame is clamped on the outside of the first fixing frame, the conical piece is fixed to the inside of the first connecting frame, and the first plug ring is clamped between the catheter and the first connecting frame.

In a preferred embodiment, a cross opening is provided at the center of the conical piece. Under normal circumstances, the cross opening of the conical piece is in a closed state. When the conical piece is subjected to external force, the cross opening of the conical piece is forced to open outward to form a channel.

In a preferred embodiment, the backflow prevention mechanism includes a second fixing frame, a second connecting frame, a cylinder, a silicone sleeve and a second plug ring. The second fixing frame is fixed to the inside of the catheter away from the port body, the second connecting frame is clamped on the outside of the second fixing frame, the cylinder is fixed to the inside of the second connecting frame, a through hole is opened on the surface of the cylinder, a silicone sleeve is sleeved on the outside of the cylinder, the silicone sleeve is fixedly connected to the second connecting frame, and the second plug ring is clamped between the catheter and the second connecting frame.

In a preferred embodiment, the backflow prevention mechanism includes a third fixing frame, a third connecting frame, a round tube, a fixing bar, a connecting rod, a plug, a spring b and a third plug ring. The third fixing frame is fixed to the inside of the end of the conduit away from the port body, the third connecting frame is clamped on the outside of the third fixing frame, the round tube is fixed to the inside of the third connecting frame, the fixing bar is fixed to the inside of the round tube, the connecting rod is slidably connected to the inside of the fixing bar, the plug is fixed to the end of the connecting rod away from the fixing bar, the spring b is arranged on the outside of the connecting rod and is located between the fixing bar and the plug, and the third plug ring is clamped between the conduit and the third connecting frame.

The technical effects achieved by the present invention are:

The present invention, when injecting drug liquid into the port body, the catheter is restricted on the port body through the design of the locking mechanism, thereby avoiding the loosening of the connection between the port body and the catheter due to the high instantaneous pressure of the drug liquid injected into the port body, thereby ensuring the stability of the connection between the port body and the catheter;

In the present invention, when injecting drug liquid into the port body, the anti-backflow mechanism is designed so that the drug liquid flows into the patient's body through the anti-backflow mechanism. If backflow occurs, it can be intercepted by the anti-backflow mechanism to ensure the supply of drug liquid and avoid the impact on chemotherapy.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a schematic diagram of the overall structure of the present invention;

Fig. 2 is an exploded view of the present invention;

FIG3 is an exploded view of a first locking mechanism of the present invention;

FIG4 is a cross-sectional view of a first locking mechanism of the present invention;

FIG5 is an exploded view of a second locking mechanism of the present invention;

6 is a cross-sectional view of a second locking mechanism of the present invention;

7 is a cross-sectional view of a first backflow prevention mechanism of the present invention;

FIG8 is an enlarged view of point A in FIG7 of the present invention;

FIG9 is a schematic structural diagram of a conical sheet of the present invention;

10 is a cross-sectional view of a second backflow prevention mechanism of the present invention;

FIG. 11 is a cross-sectional view of a third backflow prevention mechanism of the present invention.

In the accompanying drawings, the components represented by the reference numerals are listed as follows:

1. Port body; 2. Silicone diaphragm; 3. Buckle; 4. Catheter; 5. Magnetic ring; 6. Spring a; 11. Truncated cone tube; 12. Truncated cone ring; 21. Truncated cone fixing tube; 22. Locking cap; 31. First fixing frame; 32. First connecting frame; 33. Conical sheet; 34. First plug ring; 41. Second fixing frame; 42. Second connecting frame; 43. Cylinder; 44. Silicone sleeve; 45. Second plug ring; 51. Third fixing frame; 52. Third connecting frame; 53. Round tube; 54. Fixing strip; 55. Connecting rod; 56. Plug block; 57. Spring b; 58. Third plug ring.

Detailed ways

In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The phrase "in a preferred embodiment" that appears in different places in this specification does not refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

Secondly, the present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

Embodiment 1

Please refer to Figures 1 and 2, which are the first embodiment of the present invention. This embodiment provides a subcutaneous drug delivery device for preoperative chemotherapy, a subcutaneous drug delivery device for preoperative chemotherapy, including a port body 1 and a locking mechanism, a silicone diaphragm 2 is installed inside the upper end of the port body 1, a catheter 4 is installed on one side of the port body 1, and the locking mechanism is arranged on the outside of the catheter 4, and the locking mechanism is used to fix the catheter 4 on the port body 1.

Specifically, before use, the catheter 4 is passed through the through hole inside the port body 1, and the catheter 4 is tightly fixedly connected to the port body 1 through the locking mechanism, and the silicone diaphragm 2 is inserted into the interior of the port body 1. The elastic buckle 3 is clamped on the outside of the port body 1 to limit the silicone diaphragm 2. The port body 1 and the catheter 4 are buried subcutaneously in the left or right chest wall of the patient, and one end of the catheter 4 is inserted into the central vein. In this way, the drug injected through the port body 1 directly enters the central vein. After the port body 1 is buried, a special puncture needle (disposable implantable drug administration needle) is used to puncture the silicone diaphragm 2 during infusion, and then the special puncture needle is connected with the infusion device to perform normal intravenous infusion treatment.

In a preferred embodiment, referring to FIG. 2 and FIG. 4 , the silicone diaphragm 2 is convex, a groove matching the silicone diaphragm 2 is formed inside the port body 1 , and the diameter of the silicone diaphragm 2 is larger than the diameter of the groove.

The silicone diaphragm 2 is integrally formed by multiple diaphragm layers with different hardness, and is made of silicone rubber with different hardness and stacked together. After the silicone diaphragm 2 is punctured and injected, there are differences in the closure of the needle holes, so that the puncture needle holes between the multiple layers inside the silicone diaphragm 2 are effectively closed and sealed, increasing the number of puncture injections and extending the service life of the device.

In this embodiment, when the silicone diaphragm 2 is inserted into the port body 1, the silicone diaphragm 2 is completely fitted to the port body 1 by the convex shape and the matching groove, as well as the deformability of the silicone diaphragm 2, thereby avoiding the generation of a gap and improving the sealing performance.

It should be noted that, please refer to Figures 2 and 4 again, an elastic buckle 3 is installed at the upper end of the port body 1 and located on the outside of the silicone diaphragm 2, a claw is provided inside the lower end of the elastic buckle 3, and a groove adapted to the claw is opened on the outside of the port body 1, and the port body 1 is snap-connected with the elastic buckle 3.

As mentioned above, after the silicone diaphragm 2 is placed inside the port body 1, the elastic buckle 3 is placed on the upper part of the port body 1, and the elastic buckle 3 is pressed so that the elastic buckle 3 is close to the silicone diaphragm 2 and squeezes the silicone diaphragm 2. Through the deformability of the elastic buckle 3, the claw and the groove are engaged at the same time to limit the elastic buckle 3, so that the silicone diaphragm 2 is tightly fixed on the port body 1. The structure is simple, one-piece molding, and maintenance is convenient.

Secondly, please refer to Figures 4 and 6 again. An annular space is set between the inside of the groove and the silicone diaphragm 2. A positioning member is installed inside the annular space. The positioning member includes a magnetic ring 5 and a spring a6. The magnetic ring 5 is set inside the annular space, and the spring a6 is also set inside the annular space and located above the magnetic ring 5.

As mentioned above, before using a special puncture needle (disposable implantable drug delivery needle) to puncture the silicone diaphragm 2 during infusion, an external annular body (magnetic or iron) is used. The size of the external annular body is close to that of the magnetic ring 5. It is placed on the outside of the skin and close to the port body 1. The magnetic ring 5 will attract the external annular body, and the external annular body will be magnetically adsorbed above the port body 1. The internal space of the external annular body is the silicone diaphragm 2. While the magnetic ring 5 attracts the external annular body, the magnetic ring 5 moves upward in the annular space and compresses the spring a6, so that the magnetic ring 5 cancels the compression of the silicone diaphragm 2, which can reduce the resistance of the special puncture needle to puncture the silicone diaphragm 2. After puncture, the external annular body is separated from the port body 1, and then through the elastic force of the spring a6, the magnetic ring 5 is squeezed on the outside of the silicone diaphragm 2 to shape the silicone diaphragm 2, so that the punctured needle hole is quickly closed under the action of the internal elastic force of the silicone diaphragm 2 to form a seal, thereby improving the service life of the silicone diaphragm 2.

Next, please refer to FIG. 3 and FIG. 4 , the locking mechanism includes a truncated cone tube 11 and a truncated cone ring 12 . The truncated cone tube 11 is disposed inside the conduit 4 at one end of the port body 1 , and the truncated cone ring 12 is disposed outside the conduit 4 and close to the truncated cone tube 11 .

Furthermore, the inner diameter of the upper base of the truncated cone ring 12 is smaller than the outer diameter of the lower base of the truncated cone tube 11, and the inner diameter of the upper base of the truncated cone ring 12 is larger than the outer diameter of the upper base of the truncated cone tube 11, so that the catheter 4 can be tightly fixed on the truncated cone tube 11 by the truncated cone ring 12, avoiding the truncated cone ring 12 from separating from the lower bottom end of the truncated cone tube 11, thereby ensuring the stability of the fixation.

As described above, when fixing the catheter 4, the truncated cone tube 11 is placed inside one end of the catheter 4, the truncated cone ring 12 is sleeved on the outside of the catheter 4, and the truncated cone ring 12 is moved to the outside of the truncated cone tube 11, so that the catheter 4 is confined on the outside of the truncated cone tube 11 by the truncated cone ring 12, and the catheter 4 is passed through the through hole of the port body 1, so that the catheter 4 is confined by the truncated cone tube 11 and the port body 1, and at the same time, the drug liquid is injected into the port body 1, and the pressure caused by the sudden increase will cause the catheter 4 to , the truncated cone 11 and the truncated cone ring 12 generate a thrust, so that the conduit 4, the truncated cone 11 and the truncated cone ring 12 move away from the port body 1, and then the port body 1 squeezes the truncated cone ring 12 and the truncated cone 11, so that the conduit 4 is tightly confined by the truncated cone 11 and the port body 1, and at the same time, the port body 1 squeezes the truncated cone ring 12, so that the conduit 4 is confined again by the truncated cone 11 and the truncated cone ring 12, and the conduit 4 is confidentially fixed by the two pressurization limitations.

Embodiment 2

Please refer to FIG. 5 and FIG. 6 , which are the second embodiment of the present invention. This embodiment is a further improvement on the first embodiment, and the difference between this embodiment and the first embodiment lies in the different locking mechanism.

As shown in Figures 5 and 6, the locking mechanism includes a truncated cone-shaped fixing tube 21 and a locking cap 22. The truncated cone-shaped fixing tube 21 is fixed to one side of the port body 1, and the conduit 4 is inserted into the outside of the truncated cone-shaped fixing tube 21. The locking cap 22 is arranged on the outside of the conduit 4 and close to the position of the truncated cone-shaped fixing tube 21. The locking cap 22 is threadedly connected to the truncated cone-shaped fixing tube 21.

Specifically, when fixing the catheter 4, the catheter 4 is sleeved on the outside of the truncated cone-shaped fixing tube 21, the locking cap 22 is placed on the outside of the catheter 4 and close to the truncated cone-shaped fixing tube 21, and the locking cap 22 is rotated to make the locking cap 22 and the truncated cone-shaped fixing tube 21 threadedly connected, so that the catheter 4 is squeezed between the locking cap 22 and the truncated cone-shaped fixing tube 21, and the catheter 4 is fixed by friction.

Embodiment 3

Please refer to FIG. 7 , which is a third embodiment of the present invention. This embodiment provides a subcutaneous drug delivery device for preoperative chemotherapy, further comprising a backflow prevention mechanism, which is disposed inside the catheter 4 at one end away from the port body 1 , and is used to prevent the drug solution from backflowing inside the catheter 4 .

Specifically, after the drug liquid is injected into the port body 1, when the drug liquid flows into the central vein through the catheter 4, the anti-reflux mechanism set inside the end of the catheter 4 away from the port body 1 can prevent the drug liquid from flowing back inside the catheter 4, thereby ensuring the supply of the drug liquid, or the harm caused by blood flowing into the catheter 4, thereby ensuring safety.

In a preferred embodiment, please refer to Figures 7 to 9, the backflow prevention mechanism includes a first fixing frame 31, a first connecting frame 32, a conical piece 33 and a first plug ring 34. The first fixing frame 31 is fixed to the inside of the end of the conduit 4 away from the port body 1, the first connecting frame 32 is clamped on the outside of the first fixing frame 31, the conical piece 33 is fixed to the inside of the first connecting frame 32, and the first plug ring 34 is clamped between the conduit 4 and the first connecting frame 32.

In this embodiment, after the drug liquid is injected into the port body 1, when the drug liquid flows into the central vein through the catheter 4, the drug liquid will generate an extrusion pressure on the conical sheet 33. After the conical sheet 33 is subjected to external force, the conical sheet 33 is forced to open outward to form a channel, so that the drug liquid passes through the conical sheet 33 and flows into the central vein. If reflux occurs, the conical sheet 33 is subjected to a reverse force, so that the conical sheet 33 forms a closed state, which can prevent the drug liquid or blood from flowing back and ensure safety.

Secondly, please refer to Figures 7 to 9 again. A cross opening is opened at the center of the conical piece 33. Under normal circumstances, the cross opening of the conical piece 33 is in a closed state. When the conical piece 33 is subjected to external force, the cross opening of the conical piece 33 is forced to open outward to form a channel.

As mentioned above, through the cross opening opened on the conical sheet 33, when the drug liquid flows into the central vein through the catheter 4, a thrust is generated on the cross opening of the conical sheet 33, so that the cross opening is in an open state to facilitate the flow of the drug liquid. After the drug liquid flows, when there is no longer a thrust on the cross opening, the cross opening will be closed. If reflux occurs, a thrust toward the port body 1 will be generated inside the catheter 4, and this thrust will cause the cross opening to be tightly closed to prevent reflux.

Embodiment 4

Please refer to FIG. 10 , which is a fourth embodiment of the present invention. This embodiment is a further improvement on the third embodiment, and the difference between this embodiment and the third embodiment lies in the different backflow prevention mechanism.

As shown in Figure 10, the backflow prevention mechanism includes a second fixing frame 41, a second connecting frame 42, a cylinder 43, a silicone sleeve 44 and a second plug ring 45. The second fixing frame 41 is fixed to the inside of the end of the catheter 4 away from the port body 1, the second connecting frame 42 is clamped on the outside of the second fixing frame 41, the cylinder 43 is fixed to the inside of the second connecting frame 42, a through hole is opened on the surface of the cylinder 43, and a silicone sleeve 44 is sleeved on the outside of the cylinder 43. The silicone sleeve 44 is fixedly connected to the second connecting frame 42, and the second plug ring 45 is clamped between the catheter 4 and the second connecting frame 42.

Specifically, after the drug liquid is injected into the port body 1, when the drug liquid flows into the central vein through the catheter 4, the drug liquid will generate a thrust on the silicone sleeve 44 away from the cylinder 43, so that the silicone sleeve 44 cancels the seal on the cylinder 43, so that the drug liquid passes through the cylinder 43 and flows into the central vein. If backflow occurs, a force will be generated on the silicone sleeve 44 to approach the cylinder 43, so that the silicone sleeve 44 is tightly attached to the surface of the cylinder 43, and the through hole of the cylinder 43 is sealed to prevent the drug liquid or blood from flowing into the interior of the cylinder 43.

Embodiment 5

Please refer to FIG. 11 , which is the fifth embodiment of the present invention. This embodiment is a further improvement on the third embodiment, and the difference between this embodiment and the third embodiment lies in the different backflow prevention mechanism.

As shown in Figure 11, the backflow prevention mechanism includes a third fixing frame 51, a third connecting frame 52, a round tube 53, a fixing bar 54, a connecting rod 55, a plug 56, a spring b57 and a third plug ring 58. The third fixing frame 51 is fixed to the inside of the end of the conduit 4 away from the port body 1, the third connecting frame 52 is clamped on the outside of the third fixing frame 51, the round tube 53 is fixed to the inside of the third connecting frame 52, the fixing bar 54 is fixed to the inside of the round tube 53, the connecting rod 55 is slidably connected to the inside of the fixing bar 54, the plug 56 is fixed to the end of the connecting rod 55 away from the fixing bar 54, the spring b57 is arranged on the outside of the connecting rod 55 and is located between the fixing bar 54 and the plug 56, and the third plug ring 58 is clamped between the conduit 4 and the third connecting frame 52.

Specifically, after the drug liquid is injected into the port body 1, when the drug liquid flows into the central vein through the catheter 4, the drug liquid will generate a thrust on the plug 56, so that the plug 56 moves away from the round tube 53, so that the plug 56 cancels the closure of the round tube 53, and at the same time squeezes the spring b57, so that the drug liquid can pass through the gap between the plug 56 and the round tube 53 and flow into the central vein. If reflux occurs, the drug liquid or blood will generate a thrust on the plug 56 toward the round tube 53, so that the plug 56 is tightly attached to the round tube 53, and the round tube 53 is closed to avoid reflux.

The working principle of the present invention is as follows: before use, the catheter 4 is passed through the through hole inside the port body 1, and the catheter 4 is tightly fixedly connected to the port body 1 through the locking mechanism, and the silicone diaphragm 2 is inserted into the inside of the port body 1. The elastic buckle 3 is clamped on the outside of the port body 1 to limit the silicone diaphragm 2. The port body 1 and the catheter 4 are buried under the left or right chest wall of the patient, and one end of the catheter 4 is inserted into the central vein. In this way, the drug injected through the port body 1 directly enters the central vein. After the port body 1 is buried, a special puncture needle (disposable implantable drug administration indwelling needle) is used to puncture the silicone diaphragm 2 during infusion. , and then use the infusion device to connect the special puncture needle to carry out normal intravenous infusion treatment, avoiding the loosening of the connection between the port body 1 and the catheter 4 due to the high instantaneous pressure in the port body 1, ensuring the stability of the connection between the port body 1 and the catheter 4. After the drug liquid is injected into the port body 1, when the drug liquid flows into the central vein through the catheter 4, the anti-reflux mechanism set inside the end of the catheter 4 away from the port body 1 can prevent the drug liquid from flowing back inside the catheter 4, thereby ensuring the supply of the drug liquid, or the harm caused by blood flowing into the catheter 4, thereby ensuring safety.

The above is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the art unless otherwise specified and limited.

Claims (5)

1. A subcutaneous administration device for preoperative chemotherapy, characterized in that: comprising the following steps:

The port body (1), the interior of the upper end of the port body (1) is provided with a silica gel diaphragm (2), and one side of the port body (1) is provided with a conduit (4);

The locking mechanism is arranged on the outer side of the catheter (4) and is used for fixing the catheter (4) on the port body (1);

the backflow prevention mechanism is arranged in one end of the catheter (4) away from the port body (1) and is used for preventing liquid medicine from flowing back in the catheter (4);

The silica gel diaphragm (2) is convex, a groove matched with the silica gel diaphragm (2) is formed in the port body (1), and the diameter of the silica gel diaphragm (2) is larger than that of the groove;

An annular space is formed between the inside of the groove and the silica gel diaphragm (2), a positioning piece is arranged in the annular space, the positioning piece comprises a magnetic ring (5) and a spring a (6), the magnetic ring (5) is arranged in the annular space, and the spring a (6) is also arranged in the annular space and is positioned above the magnetic ring (5);

the locking mechanism comprises a circular truncated cone-shaped pipe (11) and a circular truncated cone-shaped ring (12), the circular truncated cone-shaped pipe (11) is arranged in the port body (1) of the catheter (4), and the circular truncated cone-shaped ring (12) is arranged on the outer side of the catheter (4) and is close to the circular truncated cone-shaped pipe (11);

the inner diameter of the upper bottom of the truncated cone-shaped ring (12) is smaller than the outer diameter of the lower bottom of the truncated cone-shaped tube (11), and the inner diameter of the upper bottom of the truncated cone-shaped ring (12) is larger than the outer diameter of the upper bottom of the truncated cone-shaped tube (11).

2. A subcutaneous administration device for preoperative chemotherapy as claimed in claim 1, wherein: the backflow prevention mechanism comprises a first fixing frame (31), a first connecting frame (32), a conical sheet (33) and a first plug ring (34), wherein the first fixing frame (31) is fixed inside one end of a catheter (4) far away from a port body (1), the first connecting frame (32) is clamped on the outer side of the first fixing frame (31), the conical sheet (33) is fixed inside the first connecting frame (32), and the first plug ring (34) is clamped between the catheter (4) and the first connecting frame (32).

3. A subcutaneous administration device for preoperative chemotherapy as claimed in claim 2, wherein: the center of the conical sheet (33) is provided with a cross opening, the cross opening of the conical sheet (33) is in a closed state in a normal state, and when the conical sheet (33) is stressed by external force, the cross opening of the conical sheet (33) is stressed to be outwards opened to form a channel.

4. A subcutaneous administration device for preoperative chemotherapy as claimed in claim 1, wherein: the backflow prevention mechanism comprises a second fixing frame (41), a second connecting frame (42), a cylinder (43), a silica gel sleeve (44) and a second plug ring (45), wherein the second fixing frame (41) is fixed inside one end of a catheter (4) far away from a port body (1), the second connecting frame (42) is clamped on the outer side of the second fixing frame (41), the cylinder (43) is fixed inside the second connecting frame (42), a through hole is formed in the surface of the cylinder (43), the silica gel sleeve (44) is sleeved on the outer side of the cylinder (43), the silica gel sleeve (44) is fixedly connected with the second connecting frame (42), and the second plug ring (45) is clamped between the catheter (4) and the second connecting frame (42).

5. A subcutaneous administration device for preoperative chemotherapy as claimed in claim 1, wherein: the backflow prevention mechanism comprises a third fixing frame (51), a third connecting frame (52), a round tube (53), a fixing strip (54), a connecting rod (55), a plug block (56), a spring b (57) and a third plug ring (58), wherein the third fixing frame (51) is fixed inside one end of a port body (1) far away from a guide tube (4), the third connecting frame (52) is clamped outside the third fixing frame (51), the round tube (53) is fixed inside the third connecting frame (52), the fixing strip (54) is fixed inside the round tube (53), the connecting rod (55) is connected inside the fixing strip (54) in a sliding mode, the plug block (56) is fixed at one end, far away from the connecting rod (55), of the connecting rod (55), the spring b (57) is arranged outside the connecting rod (55) and is located between the fixing strip (54) and the plug block (56), and the third plug ring (58) is clamped between the guide tube (4) and the third connecting frame (52).