CN115554518A - Subcutaneous drug delivery device for preoperative chemotherapy - Google Patents

Abstract

The invention belongs to the technical field of medical devices, and in particular relates to a subcutaneous drug delivery device for preoperative chemotherapy. The subcutaneous drug delivery device for preoperative chemotherapy includes a port body, a locking mechanism and an anti-reflux mechanism. The upper end of the port body is A silicone diaphragm is installed inside, the upper end of the port body is installed with a buckle on the outside of the silica gel diaphragm, a conduit is installed on one side of the port body, and the locking mechanism is set on the outside of the conduit. In this invention, when the drug liquid is injected into the port body, the catheter is limited on the port body through the design of the locking mechanism, so as to avoid the gap between the port body and the catheter due to the high instantaneous pressure of the drug liquid injected into the port body. The connection is loose, which ensures the stability of the connection between the port body and the catheter; when the drug liquid is injected into the port body, the design of the anti-backflow mechanism allows the drug liquid to flow into the patient's body through the anti-backflow mechanism. The anti-backflow mechanism intercepts the flow to ensure the supply of the drug liquid.

Description

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 administration is a way of delivering drugs locally or systemically through the skin through subcutaneous capillaries to achieve disease treatment. It can be used for diabetes, allergic skin diseases, epilepsy and other mental diseases, cardiovascular diseases, and cancer chemotherapy. Patients who need long-term, repeated infusion administration. Because subcutaneous administration can bypass the first-pass effect of the liver, and there is no gastrointestinal damage, it can minimize the attenuation of drug concentration, reduce toxic and side effects, and improve the efficiency of medication. Therefore, subcutaneous administration is often used in preoperative chemotherapy. Infusion of various high-concentration chemotherapeutic drugs, parenteral nutrition solutions, blood transfusion, repeated blood collection, etc. can reduce the pain of repeated puncture, 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 administration is filled with drug liquid into the port body, due to the high instantaneous pressure in the port body, the port body and the catheter will bear a relatively large impact force, and the Since the connection between the port body and the conduit is generally assembled for the convenience of manufacturing and processing, when the instantaneous pressure in the port increases, it is easy to cause deviations in the connection strength between the port body and the conduit, or even The risk of shedding occurs, endangering the life and health of the patient, and when the drug liquid enters the human vein through the catheter, sometimes the phenomenon of drug liquid backflow occurs, which not only affects the supply of the drug liquid, reduces the effect of chemotherapy, but also causes harm to the body itself. Certain hazards.

Such as Chinese patent, publication number is CN212651172U, discloses infusion port, and this technology is to utilize connecting tube to connect between port body and catheter, and guarantees that in the infusion process, it is direct flow, and medical active material can not be in the liquid storage cavity Moreover, the oblique setting of the liquid storage chamber and the silica gel, combined with the straight-line non-damaging needle, is conducive to the operation and use of medical staff, but in fact, there is no better way to fix the catheter, and there is no proposal to prevent the backflow of the drug liquid s method.

Contents of the invention

The purpose of the present invention is to provide a subcutaneous drug delivery device for preoperative chemotherapy, which can effectively strengthen the fixation between the catheter and the port body, improve the stability of the connection between the two, avoid the separation of the two, and ensure safety. , can prevent the phenomenon of drug liquid backflow.

The technical scheme that the present invention takes is specifically as follows:

A subcutaneous drug delivery device for preoperative chemotherapy, comprising:

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

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

An anti-backflow mechanism, the anti-backflow mechanism is arranged inside the end of the catheter away from the port body, and the anti-backflow mechanism is used to prevent the backflow of the medicinal liquid inside the catheter.

In a preferred solution, the silica gel diaphragm is convex, and a groove matching the silica gel diaphragm is provided inside the port body, and the diameter of the silica gel diaphragm is larger than the diameter of the groove.

In a preferred solution, an annular space is provided between the inside of the groove and the silica gel diaphragm, and a positioning member is installed inside the annular space, and the positioning member includes a magnetic ring and a spring a, and the magnetic ring is set Inside the annular space, the spring a is also arranged inside the annular space and above the magnetic ring.

In a preferred solution, the locking mechanism includes a truncated conical tube and a truncated conical ring, the truncated conical tube is arranged inside the conduit at one end of the port body, and the truncated conical ring is arranged on the outside of the conduit and close to the truncated conical ring. the position of the tube.

In a preferred solution, the inner diameter of the upper bottom of the truncated conical ring is smaller than the outer diameter of the lower bottom of the truncated tube, and the inner diameter of the upper bottom of the truncated ring is larger than the outer diameter of the upper bottom of the truncated tube.

In a preferred solution, the locking mechanism includes a truncated conical fixing tube and a locking cap, the truncated conical fixing tube is fixed on one side of the port body, the catheter is inserted on the outside of the truncated conical fixing tube, the The lock cap is arranged on the outside of the catheter and at a position close to the truncated conical fixed pipe, and is threadedly connected with the truncated conical fixed pipe.

In a preferred solution, the anti-backflow mechanism includes a first fixing frame, a first connecting frame, a conical piece and a first plug ring, the first fixing frame is fixed inside the end of the conduit away from the port body, and the The first connecting frame is clamped on the outside of the first fixing frame, the conical piece is fixed inside the first connecting frame, and the first plug ring is clamped between the conduit and the first connecting frame.

In a preferred solution, a cross opening is provided at the center of the conical sheet. Under normal conditions, the cross opening of the conical sheet is closed. When the conical sheet is subjected to an external force, the conical sheet The cross opening of the sheet is forced to open outwards to form a channel.

In a preferred solution, the anti-backflow mechanism includes a second fixing frame, a second connecting frame, a cylinder, a silicone sleeve and a second plug ring, and the second fixing frame is fixed inside the end of the conduit away from the port body, The second connecting frame is clamped on the outside of the second fixing frame, the cylinder is fixed inside the second connecting frame, the surface of the cylinder is provided with a through hole, and the outside of the cylinder is sleeved with silica gel The silicone sleeve is fixedly connected to the second connecting frame, and the second plug ring is clamped between the conduit and the second connecting frame.

In a preferred solution, the anti-backflow mechanism includes a third fixing frame, a third connecting frame, a round tube, a fixing bar, a connecting rod, a block, a spring b and a third plug ring, and the third fixing frame fixes On 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 inside the third connecting frame, and the fixing strip is fixed inside the round tube. The connecting rod is slidably connected inside the fixing bar, the block is fixed on the end of the connecting rod away from the fixing bar, the spring b is arranged on the outside of the connecting rod and between the fixing bar and the block, and the third plug The ring is clamped between the conduit and the third connecting frame.

The technical effect that the present invention obtains is:

In the present invention, when the drug liquid is injected into the port body, the catheter is limited on the port body through the design of the locking mechanism, so as to avoid the gap between the port body and the catheter caused by the high instantaneous pressure of the drug liquid injected into the port body. The connection is loose, which ensures the stability of the connection between the port body and the conduit;

In the present invention, when the medicine liquid is injected into the port body, the medicine liquid flows into the patient's body through the backflow prevention mechanism through the design of the backflow prevention mechanism. If backflow occurs, the flow can be intercepted by the backflow prevention mechanism to ensure the supply of the medicine liquid , to avoid the impact of chemotherapy.

Description of drawings

Fig. 1 is the overall structural representation of the present invention;

Fig. 2 is an explosion diagram of the present invention;

Fig. 3 is an exploded view of the first locking mechanism of the present invention;

Fig. 4 is a sectional view of the first locking mechanism of the present invention;

Fig. 5 is an exploded view of the second locking mechanism of the present invention;

Fig. 6 is a sectional view of the second locking mechanism of the present invention;

Fig. 7 is a sectional view of the first backflow prevention mechanism of the present invention;

Fig. 8 is the enlarged view of place A in Fig. 7 of the present invention;

Fig. 9 is the structural representation of conical sheet of the present invention;

Fig. 10 is a cross-sectional view of the 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 list of parts represented by each label is as follows:

1. Port body; 2. Silicone diaphragm; 3. Buckle; 4. Conduit; 5. Magnetic ring; 6. Spring a; 11. Conical tube; 12. Conical ring; 21. Conical fixed tube; 22. Lock cap; 31, first fixing frame; 32, first connecting frame; 33, conical piece; 34, first plug ring; 41, second fixing frame; 42, second connecting frame; 43, cylinder; 44. Silicone sleeve; 45. Second plug ring; 51. Third fixed frame; 52. Third connecting frame; 53. Round tube; 54. Fixed bar; 55. Connecting rod; 56. Plug block; 57. Spring b ; 58, the third plug ring.

detailed description

In order to make the above objects, features and advantages of the present invention more obvious and comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

In the following description, a lot of specific details are set forth in order to fully understand the present invention, but the present invention can also be implemented in other ways different from those described here, and those skilled in the art can do it without departing from the meaning of the present invention. By analogy, the present invention is therefore not limited to the specific examples disclosed below.

Second, "one embodiment" or "an embodiment" referred to herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. "In a preferred embodiment" appearing in different places in this specification does not all 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 in conjunction with schematic diagrams. When describing the embodiments of the present invention in detail, for the convenience of explanation, the cross-sectional view showing the structure of the device will not be partially enlarged according to the general scale, and the schematic diagram is only an example, and it should not be used here. Limit the scope of protection of the present invention. In addition, the three-dimensional space dimensions of length, width and depth should be included in actual production.

Embodiment one

Please refer to accompanying drawing 1 and shown in Fig. 2, be the first embodiment of the present invention, this embodiment provides a kind of subcutaneous drug delivery device for preoperative chemotherapy, a kind of subcutaneous drug delivery device for preoperative chemotherapy, comprising The port body 1 and the locking mechanism, a silicone diaphragm 2 is installed inside the upper end of the port body 1, a conduit 4 is installed on one side of the port body 1, and the locking mechanism is arranged on the outside of the conduit 4, and the locking mechanism is used to fix the conduit 4 On 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 and fixedly connected with the port body 1 through a locking mechanism, so that the silicone diaphragm 2 is placed inside the port body 1, and the elastic The buckle 3 is snapped on the outside of the port body 1, and the silicone diaphragm 2 is limited. The port body 1 and the catheter 4 are embedded under the left or right chest wall of the patient, and one end of the catheter 4 is inserted into the central vein. 1 Enter the drug directly into the central vein, embed the port body 1, use a special puncture needle (one-time implantable drug retention needle) to puncture the silicone septum 2 during infusion, and then connect the special puncture needle with the infusion device. Normal intravenous infusion therapy was carried out.

In a preferred embodiment, please refer to Fig. 2 and Fig. 4, the silicone diaphragm 2 is convex, and the inside of the port body 1 is provided with a groove suitable for the silica gel diaphragm 2, and the diameter of the silica gel diaphragm 2 is larger than the groove diameter of.

The silicone diaphragm 2 is integrally formed by multiple diaphragm layers with different hardness, which are made of silicone rubber with different hardness and stacked together. After the silica gel diaphragm 2 is punctured and injected, there are differences in the closure of the pinholes, reaching the multi-layer inside the silica gel diaphragm 2. The puncture needle holes between them are effectively closed and sealed, increasing the number of puncture injections and prolonging the service life of the device.

In this embodiment, when the silicone diaphragm 2 is placed inside the port body 1, the silicone diaphragm 2 is completely attached to the port body 1 through the convex shape and the matching groove, as well as the deformability of the silica gel diaphragm 2 , to avoid the generation of gaps and improve the sealing.

It should be noted that, please refer to Figure 2 and Figure 4 again, the upper end of the port body 1 and the outer side of the silicone diaphragm 2 are equipped with an elastic buckle 3, the lower end of the elastic buckle 3 is provided with claws inside, and the outer side of the port body 1 There are slots matching the jaws, and the port body 1 is engaged 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 the silicone diaphragm 2 is squeezed. Pressing, through the deformability of the elastic buckle 3, at the same time, the claws and the slots are engaged, and the elastic buckle 3 is limited, so that the silicone diaphragm 2 is tightly fixed on the port body 1, the structure is simple, and it is integrally formed. Easy maintenance.

Secondly, please refer to Fig. 4 and Fig. 6 again, there is an annular space between the inside of the groove and the silicone diaphragm 2, and a positioning member is installed inside the annular space, and the positioning member includes a magnetic ring 5 and a spring a6 , the magnetic ring 5 is arranged inside the annular space, and the spring a6 is also arranged inside the annular space and above the magnetic ring 5 .

As mentioned above, before using the special puncture needle (disposable implantable drug retention needle) to puncture the silica gel septum 2 during infusion, use the external annular body (magnetic or iron), the size of the external annular body is the same as that of the magnetic ring 5 Close to, placed on the outside of the skin and close to the position of the port body 1, the magnetic ring 5 will attract the external annular body, the external annular body will be magnetically adsorbed on the top of the port body 1, and the external annular body The inner space 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. Reduce the resistance of the special puncture needle to puncture the silicone diaphragm 2. After the puncture, the external annular body is separated from the port body 1, and then the magnetic ring 5 is squeezed on the outside of the silica gel diaphragm 2 by the elastic force of the spring a6. The diaphragm 2 is shaped so that the punctured pinholes are quickly closed under the action of the internal elasticity of the silica gel diaphragm 2 to form a seal, which improves the service life of the silica gel diaphragm 2 .

Next, please refer to Fig. 3 and Fig. 4 together, and locking mechanism comprises conical tube 11 and conical ring 12, and conical tube 11 is arranged on the inside that conduit 4 is positioned at port body 1, and conical ring 12 is arranged on conduit 4 and close to the position of the truncated tube 11.

Further, the inner diameter of the upper bottom of the truncated cone ring 12 is less than the outer diameter of the lower bottom of the truncated cone tube 11, and the inner diameter of the upper bottom of the truncated cone ring 12 is greater than the outer diameter of the upper bottom of the truncated tube 11, so that the conduit 4 is covered by the truncated ring 12 Tightly fixed on the truncated-conical tube 11, avoiding the separation of the truncated-conical ring 12 from the lower end of the truncated-conical tube 11, ensuring the stability of fixing.

As mentioned above, when the catheter 4 is fixed, the truncated conical tube 11 is inserted into the inside of one end of the catheter 4, the truncated conical ring 12 is sleeved on the outside of the catheter 4, and the truncated conical ring 12 is moved to the outer position of the truncated conical tube 11, so that The conduit 4 is limited by the truncated cone ring 12 on the outside of the truncated tube 11, and the conduit 4 passes through the through hole of the port body 1, so that the conduit 4 is limited by the truncated tube 11 and the port body 1, and at the same time in the port body 1 The internal injection of the medicinal liquid, resulting in a sudden increase in pressure, will produce a thrust on the catheter 4, the truncated conical tube 11 and the truncated conical ring 12, so that the catheter 4, the truncated conical tube 11 and the truncated conical ring 12 are far away from the port body 1, and then The frustum-shaped ring 12 and the truncated-conical tube 11 are squeezed by the port body 1, so that the conduit 4 is tightly limited by the truncated-conical tube 11 and the port body 1, and at the same time, the port body 1 squeezes the truncated-conical ring 12, so that the conduit 4 Redefined by the truncated conical tube 11 and the truncated conical ring 12 , the catheter 4 is securely fixed by the two pressurized restrictions.

Embodiment two

Please refer to Figure 5 and Figure 6, which is the second embodiment of the present invention. This embodiment is further improved on the basis of Embodiment 1. The difference between it and Embodiment 1 lies in the locking mechanism.

As shown in Figures 5 and 6, the locking mechanism includes a truncated conical fixed tube 21 and a locking cap 22, the truncated conical fixed tube 21 is fixed on one side of the port body 1, and the conduit 4 is inserted on the outside of the truncated conical fixed tube 21, The locking cap 22 is arranged on the outside of the catheter 4 and close to the truncated conical fixing tube 21 , and the locking cap 22 is screwed to the truncated conical fixing tube 21 .

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

Embodiment Three

Please refer to the accompanying drawing 7, which is the third embodiment of the present invention, which provides a subcutaneous drug delivery device for preoperative chemotherapy, and also includes an anti-reflux mechanism. The anti-reflux mechanism is arranged on the catheter 4 away from the port body. 1, the anti-backflow mechanism is used to prevent the liquid medicine 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 provided inside the end of the catheter 4 away from the port body 1 can prevent the drug liquid from being generated inside the catheter 4. The backflow ensures the supply of the drug liquid, or the harm caused by the blood flowing into the inside of the catheter 4 ensures safety.

In a preferred embodiment, please refer to accompanying drawings 7-shown in Figure 9, the anti-backflow mechanism includes a first fixed frame 31, a first connecting frame 32, a conical piece 33 and a first plug ring 34, the first fixed The frame 31 is fixed on the inside of the conduit 4 away from the end of 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 on the inside of the first connecting frame 32, and the first plug ring 34 is clamped. Connected between the conduit 4 and the first connecting frame 32.

In this embodiment, after the medicinal liquid is injected into the port body 1, when the medicinal liquid flows into the central vein through the catheter 4, the medicinal liquid will generate a pressing force on the conical piece 33, and after the conical piece 33 is subjected to an external force , the conical sheet 33 is forced to open outwards to form a channel, so that the liquid of the drug passes through the conical sheet 33 and flows into the central vein. A closed state is formed to prevent backflow of drug liquid or blood and ensure safety.

Secondly, please refer to Fig. 7-Fig. 9 again, the center of the conical sheet 33 is provided with a cross opening, and the cross opening of the conical sheet 33 is in a closed state under normal conditions, when the conical sheet 33 is subjected to an external force, the conical sheet The cross opening of 33 is forced to open outwards to form a channel.

As mentioned above, through the cross opening on the conical sheet 33, when the medicinal 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 opened to facilitate the flow of the medicinal liquid. After the medicine liquid flows, when there is no more thrust on the cross opening, the cross opening will be closed. If backflow occurs, a thrust towards the port body 1 will be generated inside the catheter 4, and this thrust will make the cross opening Tight closure to prevent backflow.

Embodiment four

Please refer to Figure 10, which is the fourth embodiment of the present invention. This embodiment is further improved on the basis of the third embodiment. The difference between it and the third embodiment lies in the anti-backflow mechanism.

As shown in Figure 10, the anti-backflow 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, and the second fixing frame 41 is fixed on the end of the conduit 4 away from the port body 1 Inside, the second connecting frame 42 is clamped on the outside of the second fixing frame 41, the cylinder 43 is fixed inside the second connecting frame 42, the surface of the cylinder 43 is provided with a through hole, and the outside of the cylinder 43 is sleeved with The silicone sleeve 44 is fixedly connected to the second connecting frame 42 , and the second plug ring 45 is clamped between the conduit 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 away from the cylinder 43 on the silicone sleeve 44, so that the silicone sleeve 44 cancels the pressure on the cylinder 43. closed, so that the drug liquid flows into the central vein through the cylinder 43, if backflow occurs, a force will be generated on the silicone sleeve 44 close to the cylinder 43, so that the silicone sleeve 44 is closely attached to the surface of the cylinder 43, and the The through hole of the cylinder 43 is sealed to prevent liquid medicine or blood from flowing into the cylinder 43 .

Embodiment five

Please refer to Figure 11, which is the fifth embodiment of the present invention. This embodiment is further improved on the basis of the third embodiment. The difference between it and the third embodiment lies in the anti-backflow mechanism.

As shown in Figure 11, the anti-backflow mechanism includes a third fixing frame 51, a third connecting frame 52, a round pipe 53, a fixing bar 54, a connecting rod 55, a plug 56, a spring b57 and a third plug ring 58, and the third fixing The frame 51 is fixed on 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 inside the third connecting frame 52, and the fixing bar 54 is fixed on the round tube 53, the connecting rod 55 is slidably connected to the inside of the fixing bar 54, and the plug 56 is fixed on the end of the connecting rod 55 away from the fixing bar 54. Between, 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 block 56, so that the block 56 is far away from the round tube 53, so that the block 56 is canceled. Sealing the round tube 53 and squeezing the spring b57 at the same time can make the drug liquid flow into the central vein through the gap between the plug 56 and the round tube 53. If backflow occurs, the drug liquid or blood will The plug 56 generates a thrust toward the round tube 53, so that the plug 56 is closely attached to the round tube 53, and the round tube 53 is sealed to avoid backflow.

The working principle of the present invention is: before use, the conduit 4 passes through the through hole inside the port body 1, and the conduit 4 is tightly and fixedly connected with the port body 1 through the locking mechanism, so that 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, the silicone diaphragm 2 is limited, the port body 1 and the catheter 4 are embedded in the patient's left or right chest wall subcutaneously, and one end of the catheter 4 is inserted into the central vein. The drug enters the central vein directly through the port body 1, embeds the port body 1, and uses a special puncture needle (one-time implantable drug retention needle) to puncture the silicone septum 2 during infusion, and then connects the special puncture needle with an infusion device. The needle can be used for normal intravenous infusion treatment, avoiding the loose connection between the port body 1 and the catheter 4 due to the high instantaneous pressure in the port body 1, and 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 provided inside the end of the catheter 4 away from the port body 1 can prevent the drug liquid from backflowing inside the catheter 4 and ensure drug The supply of the liquid, or the inside of the blood flowing into the catheter 4, and the harm caused, guarantee the safety.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications should also be It is regarded as the protection scope of the present invention. The structures, devices and operation methods not specifically described and explained in the present invention, unless otherwise specified and limited, shall be implemented according to conventional means in the art.

Claims (10)

1. A subcutaneous drug delivery device for pre-operative chemotherapy, characterized in that: the method comprises the following steps:

the harbor comprises a harbor body (1), wherein a silica gel diaphragm (2) is arranged in the upper end of the harbor body (1), and a catheter (4) is arranged on one side of the harbor body (1);

the locking mechanism is arranged on the outer side of the guide pipe (4) and is used for fixing the guide pipe (4) on the harbor body (1);

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

2. The subcutaneous delivery device for pre-operative chemotherapy of claim 1, wherein: silica gel diaphragm (2) are protruding type, the recess with silica gel diaphragm (2) looks adaptation is seted up to the inside of harbor body (1), the diameter of silica gel diaphragm (2) is greater than the diameter of recess.

3. The subcutaneous delivery device for pre-operative chemotherapy of claim 2, wherein: be provided with annular space between the inside of recess and silica gel diaphragm (2), annular space's internally mounted has the setting element, the setting element includes magnetic ring (5) and spring a (6), magnetic ring (5) set up the inside at annular space, spring a (6) also set up the inside at annular space and are located the top of magnetic ring (5).

4. The subcutaneous delivery device for pre-operative chemotherapy of claim 1, wherein: 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 inside one end, located at the port body (1), of the guide pipe (4), and the circular truncated cone-shaped ring (12) is arranged on the outer side of the guide pipe (4) and close to the circular truncated cone-shaped pipe (11).

5. The subcutaneous delivery device for pre-operative chemotherapy of claim 4, wherein: the inner diameter of the upper bottom of the circular truncated cone-shaped ring (12) is smaller than the outer diameter of the lower bottom of the circular truncated cone-shaped pipe (11), and the inner diameter of the upper bottom of the circular truncated cone-shaped ring (12) is larger than the outer diameter of the upper bottom of the circular truncated cone-shaped pipe (11).

6. A subcutaneous administration device for pre-operative chemotherapy according to claim 1, characterized in that: the locking mechanism comprises a truncated cone-shaped fixed pipe (21) and a locking cap (22), the truncated cone-shaped fixed pipe (21) is fixed on one side of the harbor body (1), the guide pipe (4) is inserted into the outer side of the truncated cone-shaped fixed pipe (21), and the locking cap (22) is arranged on the outer side of the guide pipe (4) and close to the position of the truncated cone-shaped fixed pipe (21) and is in threaded connection with the truncated cone-shaped fixed pipe (21).

7. The subcutaneous delivery device for pre-operative chemotherapy of claim 1, wherein: backflow prevention mechanism includes first mount (31), first link (32), conical piece (33) and first stopper ring (34), the inside of catheter (4) departure harbor body (1) one end is fixed in first mount (31), the outside at first mount (31) is connected in first link (32) joint, the inside at first link (32) is fixed in conical piece (33), first stopper ring (34) joint is between catheter (4) and first link (32).

8. The subcutaneous administration device for pre-operative chemotherapy according to claim 7, 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 under a normal state, and when the conical sheet (33) bears external force, the cross opening of the conical sheet (33) is forced to be opened outwards to form a channel.

9. The subcutaneous delivery device for pre-operative chemotherapy of claim 1, wherein: backflow prevention mechanism includes second mount (41), second link (42), drum (43), silica gel cover (44) and second cock ring (45), the inside of keeping away from harbor body (1) one end in pipe (4) is fixed in second mount (41), the outside at second mount (41) is connected in second link (42) to second link (42) joint, the inside at second link (42) is fixed in drum (43), the through-hole has been seted up on the surface of drum (43), silica gel cover (44) have been cup jointed in the outside of drum (43), silica gel cover (44) and second link (42) fixed connection, second cock ring (45) joint is between pipe (4) and second link (42).

10. A subcutaneous administration device for pre-operative chemotherapy according to claim 1, characterized in that: the backflow prevention mechanism comprises a third fixing frame (51), a third connecting frame (52), a round pipe (53), a fixing strip (54), a connecting rod (55), a plugging block (56), a spring b (57) and a third plugging ring (58), wherein the third fixing frame (51) is fixed in the catheter (4) far away from one end of the harbor body (1), the third connecting frame (52) is connected to the outer side of the third fixing frame (51) in a clamped mode, the round pipe (53) is fixed in the third connecting frame (52), the fixing strip (54) is fixed in the round pipe (53), the connecting rod (55) is connected to the fixing strip (54) in a sliding mode, the plugging block (56) is fixed at one end, far away from the fixing strip (54), of the spring b (57) is arranged on the outer side of the connecting rod (55) and located between the fixing strip (54) and the plugging block (56), and the third plugging ring (58) is connected between the catheter (4) and the third connecting frame (52).

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