CN120754360B - A double-lumen indwelling needle for drug-induced myocardial perfusion testing - Google Patents

Abstract

The invention provides a double-cavity indwelling needle for drug-loaded myocardial perfusion examination, and belongs to the field of medical devices. The heparin cap comprises a heparin cap and a catheter seat arranged on one side of the heparin cap, wherein a branch pipe is fixedly connected to a liquid inlet of the catheter seat, a connecting sleeve is fixedly connected to a port of the heparin cap, a connecting pipe is fixedly connected to a port of the connecting sleeve, and one end of the connecting pipe is fixedly connected with the branch pipe. According to the invention, through the cooperation of the parts such as the thread sleeve and the like, after the staff punctures the rubber block, the medicament is injected into the thread sleeve, and then the medicament can flow into the flow pipe through the second guide hole and the first guide hole, and the second soft film is flushed away so as to flow into a patient, so that the device can simultaneously drive in the developer and the adenosine injection, multiple needle insertion operation of the staff on the patient is not needed, pain of the patient caused by repeated puncture is avoided, and the overall practicability of the device is improved.

Description

A double-lumen indwelling needle for drug-induced myocardial perfusion testing

Technical Field

This invention relates to the field of medical devices, and more specifically, to a double-lumen indwelling needle for drug-loaded myocardial perfusion testing.

Background Technology

When performing a myocardial drug stress test, adenosine injection is continuously pumped. When the pump is halfway through, the contrast agent needs to be injected. The standard procedure is to insert one needle in each hand, one for pumping the drug and the other for injecting the contrast agent. However, this can be quite painful for the patient, and sometimes if the patient's blood vessels are not in good condition, several needles may be needed, which is difficult for the patient to accept.

Currently, when inserting a needle into one hand, the indwelling needle used in clinical practice has only one channel. This can lead to a situation where, when pumping adenosine and then administering contrast agent, there is a transient overdose of adenosine and the contrast agent occupies the same channel, resulting in a short-term inability to continuously pump in the adenosine injection solution. To address this issue, we provide a dual-lumen indwelling needle for drug-loaded myocardial perfusion testing to solve the above problems.

Summary of the Invention

To address the problem that existing indwelling needles cannot simultaneously administer contrast agent and adenosine injection, the present invention aims to provide a dual-lumen indwelling needle for drug-loaded myocardial perfusion examination.

To solve the above problems, the present invention adopts the following technical solution:

A dual-lumen indwelling needle for drug-loaded myocardial perfusion testing includes: a heparin cap and a catheter seat disposed on one side of the heparin cap, with a branch tube fixedly connected to the inlet of the catheter seat; a connecting sleeve fixedly connected to the port of the heparin cap, with a connecting tube fixedly connected to the port of the connecting sleeve, one end of the connecting tube being fixedly connected to the branch tube; a needle mounted on the end of the catheter seat, with a puncture needle fixedly connected to the inner side of the needle, and one end of the puncture needle extending to the outside of the catheter seat; and a dual-lumen injection structure located on one side of the connecting sleeve and extending through to the inner side of the catheter seat for simultaneous injection of two drugs.

Optionally, the dual-cavity injection structure includes a flow tube fixedly connected to one side of the connecting sleeve, and one end of the flow tube passes through the connecting sleeve and extends into the interior of the catheter seat through the branch tube. A flow guide shell is fixedly connected inside the catheter seat, and the inlet of the flow guide shell communicates with the flow tube. A fixing cap is fixedly connected to one end of the flow tube.

Optionally, the dual-lumen injection structure further includes a soft sleeve fixedly connected to the outlet of the catheter seat, a first soft membrane fixedly connected to the inner side of the soft sleeve, and the first soft membrane adhering to the outer wall of the puncture needle, a flow guide groove provided between the first soft membrane and the soft sleeve, a flow guide port communicating with the flow guide groove being opened inside the flow guide shell, and a piston assembly being provided inside the fixing cap.

Optionally, a connecting spacer is fixedly connected to the bottom of the soft sleeve, and a second soft film is fixedly connected to the bottom of the first soft film, with the second soft film adhering to the bottom of the connecting spacer.

Optionally, the piston assembly includes a threaded groove, a second straight groove, and a first straight groove formed inside the fixed cap. A threaded sleeve is threadedly connected to the inner side of the threaded groove. A second guide hole extending to the outside is formed inside the threaded sleeve. A first guide hole communicating with the second straight groove is formed inside the threaded groove.

Optionally, a rubber block is fixedly connected to the inner side of the threaded sleeve to prevent the threaded sleeve from communicating with the outside.

Optionally, the piston assembly further includes a retaining ring fixedly connected to the bottom of the threaded sleeve, and a sealing rubber is fixedly connected to the outer side of the retaining ring.

Optionally, a conical groove is provided between the first straight groove and the second straight groove, through which the sealing rubber is compressed.

Optionally, the diameter of the first straight groove is smaller than the diameter of the sealing rubber, and the diameter of the sealing rubber is larger than the diameter of the threaded groove.

Compared with the prior art, the technical solution provided by this invention has at least the following beneficial effects:

In the above scheme, by setting up parts such as threaded sleeves, after the staff punctures the rubber block and injects the medicine into the threaded sleeve, it can flow into the flow tube through the second guide hole and the first guide hole, and flush the second soft membrane to flow into the patient's body. This allows the device to inject contrast agent and adenosine injection solution at the same time, without the need for the staff to perform multiple needle operations on the patient, avoiding the pain caused by repeated punctures. Each puncture may cause infection or vascular damage (such as hematoma, phlebitis). Single puncture can reduce the incidence of such complications, which is especially suitable for patients with long-term infusion or fragile blood vessels, thereby improving the overall practicality of the device.

By incorporating components such as the second soft membrane, before puncture, medical personnel can rotate the fixing ring at the bottom of the threaded sleeve to the opening of the first straight groove by observing the fixing cap. Due to the sealing effect of the rubber seal, suction is generated inside the flow tube, which in turn suctions the inside of the guide groove, creating negative pressure inside the guide groove. This negative pressure causes the second soft membrane to bulge inward. Therefore, when the puncture needle is inserted, the intravascular pressure causes blood to flow rapidly into the guide groove under negative pressure, forming a clear backflow phenomenon (such as red liquid filling the guide groove). This helps medical personnel to immediately determine whether the needle has accurately entered the blood vessel, avoiding blind puncture. The negative pressure suction makes the backflow signal more sensitive, especially for patients with thin or inelastic blood vessels (such as elderly patients and children). This can shorten the puncture judgment time and reduce complications such as vascular damage and hematoma caused by repeated punctures, thereby improving the accuracy of puncture and enhancing the overall practicality of the device.

By using components such as sealing rubber, after medical staff have administered the medication, they can rotate the threaded sleeve again. By observing the sealing rubber move to the inside of the conical groove, the conical groove is blocked, thus isolating the flow tube from the outside world. This prevents external air, bacteria, or contaminants from entering the indwelling needle and the patient's blood vessels through the flow tube, reducing the risk of complications such as phlebitis and bloodstream infection.

Attached Figure Description

The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the invention and, together with the specification, further serve to explain the principles of the invention and enable those skilled in the art to practice and use the invention.

Figure 1 is a schematic diagram of the structure of the present invention;

Figure 2 is a cross-sectional view of the catheter seat of the present invention;

Figure 3 is an enlarged view of point A in Figure 2 of this invention;

Figure 4 is an enlarged view of section B in Figure 2 of this invention;

Figure 5 is a schematic diagram of the initial position structure of the threaded sleeve of the present invention;

Figure 6 is a schematic diagram of the structure when the threaded sleeve of the present invention is moved to the maximum position;

Figure 7 is a schematic diagram of the sealing rubber of the present invention blocking the conical groove;

Figure 8 is an exploded view of the fixing cap and threaded sleeve of the present invention.

[Figure Labels]

1. Heparin cap; 2. Connecting sleeve; 3. Connecting tube; 4. Catheter seat; 5. Puncture needle; 6. Fixation cap; 7. Flow tube; 8. Needle; 9. Branch tube; 10. Guide shell; 11. Soft sleeve; 12. Guide port; 13. First soft membrane; 14. Guide groove; 15. Connecting spacer; 16. Second soft membrane; 17. Threaded sleeve; 18. Fixing ring; 19. Sealing rubber; 20. First straight groove; 21. Conical groove; 22. First guide hole; 23. Second straight groove; 24. Second guide hole; 25. Threaded groove; 26. Rubber block.

As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to this specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs.

Detailed Implementation

The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. It should also be noted that, to make the embodiments more comprehensive, the following embodiments are the best and preferred embodiments, and those skilled in the art can use other alternative methods to implement some well-known technologies; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the art.

Generally, terms can be understood at least partly from their use in context. For example, depending at least partly on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood not necessarily to convey an exclusive set of factors, but rather, alternatively, depending at least partly on the context, to allow for the presence of other factors that are not necessarily explicitly described.

It is understood that the meanings of “on”, “above”, and “above” in this invention should be interpreted in the broadest manner, such that “on” means not only “directly on” something, but also includes the meaning of being “on” something with an intervening feature or layer, and that “above” or “above” means not only “on” something, but also includes the meaning of being “on” something without an intervening feature or layer.

Furthermore, spatially related terms such as “below,” “under,” “lower,” “above,” and “upper” are used herein for convenience to describe the relationship of one element or feature to one or more other elements or features, as illustrated in the accompanying drawings. Spatially related terms are intended to cover different orientations in the use or operation of the device other than those depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially related descriptive terms used herein can be interpreted similarly.

As shown in Figures 1 to 8, this embodiment of the invention provides a double-lumen indwelling needle for drug-loaded myocardial perfusion testing, comprising: a heparin cap 1 and a catheter seat 4 disposed on one side of the heparin cap 1, with a branch tube 9 fixedly connected to the inlet of the catheter seat 4; a connecting sleeve 2, fixedly connected to the port of the heparin cap 1, with a connecting tube 3 fixedly connected to the port of the connecting sleeve 2, one end of the connecting tube 3 being fixedly connected to the branch tube 9; a needle 8, mounted on the end of the catheter seat 4, with a puncture needle 5 fixedly connected to the inner side of the needle 8, and one end of the puncture needle 5 extending to the outside of the catheter seat 4; and a double-lumen injection structure, located on one side of the connecting sleeve 2 and extending through to the inner side of the catheter seat 4, for simultaneously injecting two drugs, the double-lumen injection structure including a flow tube 7 fixedly connected to one side of the connecting sleeve 2, with one end of the flow tube 7 extending through... The connecting sleeve 2 extends through the branch tube 9 to the inside of the catheter seat 4. The inside of the catheter seat 4 is fixedly connected to the flow guide shell 10. The inlet of the flow guide shell 10 is connected to the flow tube 7. One end of the flow tube 7 is fixedly connected to the fixing cap 6. The dual-lumen injection structure also includes a soft sleeve 11 fixedly connected to the outlet of the catheter seat 4. The inner side of the soft sleeve 11 is fixedly connected to the first soft membrane 13, and the first soft membrane 13 is attached to the outer wall of the puncture needle 5. A flow guide groove 14 is provided between the first soft membrane 13 and the soft sleeve 11. The inside of the flow guide shell 10 is provided with a flow guide port 12 that communicates with the flow guide groove 14. The inside of the fixing cap 6 is provided with a piston assembly. The bottom of the soft sleeve 11 is fixedly connected to the connecting spacer 15. The bottom of the first soft membrane 13 is fixedly connected to the second soft membrane 16, and the second soft membrane 16 is attached to the bottom of the connecting spacer 15.

First, when an indwelling needle is needed, after the indwelling needle is manufactured in the production workshop, the bottom of the fixing ring 18 is set at the bottom of the first straight groove 20. Then, when the user needs to use the side flow tube 7 to simultaneously inject contrast agent and adenosine injection solution, the operator can first rotate the threaded sleeve 17 to align the first guide hole 22 with the second guide hole 24. Then, the operator can puncture the rubber block 26 through other parts, and then install the two syringes onto the threaded sleeve 17 and the heparin cap 1 respectively (since how the syringes are connected to the heparin cap 1 for injection is existing technology, it is not described in detail in this solution). After the staff punctures the rubber block 26 and injects the medication into the threaded sleeve 17, it can flow into the flow tube 7 through the second guide hole 24 and the first guide hole 22, and open the second soft membrane 16 to flow into the patient's body. This allows the device to simultaneously inject contrast agent and adenosine injection solution without the need for staff to perform multiple needle pricks on the patient, avoiding the pain caused by repeated punctures. Each puncture may cause infection or vascular damage (such as hematoma, phlebitis). A single puncture can reduce the incidence of such complications, which is especially suitable for patients who receive long-term infusions or have fragile blood vessels, thereby improving the overall practicality of the device.

As shown in Figures 1 to 8, the piston assembly includes a threaded groove 25, a second straight groove 23, and a first straight groove 20 formed inside the fixed cap 6. A threaded sleeve 17 is threadedly connected to the inner side of the threaded groove 25. A second guide hole 24 extending to the outside is formed inside the threaded sleeve 17. A first guide hole 22 communicating with the second straight groove 23 is formed inside the threaded groove 25. A rubber block 26 for blocking the threaded sleeve 17 from communicating with the outside is fixedly connected to the inner side of the threaded sleeve 17. The piston assembly also includes a fixing ring 18 fixedly connected to the bottom of the threaded sleeve 17. A sealing rubber 19 is fixedly connected to the outer side of the fixing ring 18.

Furthermore, a conical groove 21 is provided between the first straight groove 20 and the second straight groove 23, through which the sealing rubber 19 is compressed. The diameter of the first straight groove 20 is smaller than the diameter of the sealing rubber 19, and the diameter of the sealing rubber 19 is larger than the diameter of the threaded groove 25.

The fixing cap 6 is made of transparent material. First, before the medical staff performs the puncture, they can observe the fixing cap 6 and rotate the fixing ring 18 at the bottom of the threaded sleeve 17 to the opening of the first straight groove 20. Due to the sealing effect of the sealing rubber 19, suction is generated inside the flow tube 7, which in turn suctions the inside of the guide groove 14, thus creating negative pressure inside the guide groove 14. This causes the second soft membrane 16 to bulge inward under the negative pressure. Therefore, when the puncture needle 5 is inserted, the pressure inside the blood vessel causes blood to flow into the guide groove 14 quickly under the negative pressure, forming a clear blood return phenomenon (such as red liquid filling the guide groove). This helps the medical staff to judge whether the needle has accurately entered the blood vessel in time, avoiding blind puncture. The negative pressure suction makes the blood return signal more sensitive, especially for patients with thin blood vessels or poor elasticity (such as elderly patients and children). It can shorten the puncture judgment time and reduce complications such as vascular damage and hematoma caused by repeated punctures, thereby improving the accuracy of puncture and improving the overall practicality of the device.

When medication needs to be injected, the operator can continue to rotate the threaded sleeve 17, causing the sealing rubber 19 to move into the second straight groove 23. When the sealing rubber 19 reaches the opening of the second straight groove 23, the threaded sleeve 17 moves to its maximum position. At this time, the initial diameter of the sealing rubber 19 is smaller than that of the second straight groove 23, so that after the medication is injected into the threaded sleeve 17, it can flow into the flow pipe 7 through the second guide hole 24 and the first guide hole 22.

After the medical staff has finished administering the medication, they can rotate the threaded sleeve 17 again and observe the sealing rubber 19 move to the inside of the conical groove 21, thus blocking the conical groove 21 and isolating the flow tube 7 from the outside world. This prevents external air, bacteria, or contaminants from entering the indwelling needle and the patient's blood vessels through the flow tube 7, reducing the risk of complications such as phlebitis and bloodstream infection.

The workflow of the technical solution of this invention is as follows;

First, when an indwelling needle is needed, after the indwelling needle is manufactured in the production workshop, the bottom of the fixing ring 18 is set at the bottom of the first straight groove 20. Then, when the user needs to use the side flow tube 7 to simultaneously inject contrast agent and adenosine injection, the operator can first rotate the threaded sleeve 17, so that the sealing rubber 19 moves into the second straight groove 23. When the sealing rubber 19 is at the groove opening of the second straight groove 23, the threaded sleeve 17 moves to the maximum position. At this time, the first guide hole 22 is aligned with the second guide hole 24. Then, the operator can puncture the threaded groove 25 through other parts, and then install the two syringes onto the threaded sleeve 17 and the heparin cap 1 respectively. After the operator punctures the rubber block 26 and injects the drug into the threaded sleeve 17, it can flow into the flow tube 7 through the second guide hole 24 and the first guide hole 22, and flush open the second soft membrane 16 so that it flows into the patient's body. In this way, the device can simultaneously inject contrast agent and adenosine injection without the operator having to perform multiple needle pricks on the patient.

The fixation cap 6 is made of transparent material. First, before the medical staff performs the puncture, they can observe the fixation cap 6 and rotate the fixing ring 18 at the bottom of the threaded sleeve 17 to the opening of the first straight groove 20. Due to the sealing effect of the sealing rubber 19, suction is generated inside the flow tube 7, which in turn suctions the inside of the guide groove 14, thus creating negative pressure inside the guide groove 14. This causes the second soft membrane 16 to bulge inward under the negative pressure. Therefore, when the puncture needle 5 is inserted, the pressure inside the blood vessel causes blood to flow rapidly into the guide groove 14 under the negative pressure, forming a clear backflow phenomenon (such as red liquid filling the guide groove). This helps the medical staff to judge in time whether the needle has accurately entered the blood vessel, avoiding blind puncture. The negative pressure suction makes the backflow signal more sensitive, especially for patients with thinner or less elastic blood vessels (such as elderly patients and children). It can shorten the puncture judgment time and reduce complications such as vascular damage and hematoma caused by repeated punctures, thereby improving the accuracy of puncture.

After the medical staff has finished administering the medication, they can rotate the threaded sleeve 17 again and observe the sealing rubber 19 move to the inside of the conical groove 21, thus blocking the conical groove 21 and isolating the flow tube 7 from the outside world.

This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

The above description 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 principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims (5)

1. A dual lumen indwelling needle for drug-loaded myocardial perfusion examination, comprising:

heparin cap and catheter seat set on one side of the heparin cap, the liquid inlet of the catheter seat is fixedly connected with branch pipes;

the connecting sleeve is fixedly connected to the port of the heparin cap, a connecting pipe is fixedly connected to the port of the connecting sleeve, and one end of the connecting pipe is fixedly connected with the branch pipe;

the needle head is arranged at the end part of the catheter seat, the inner side of the needle head is fixedly connected with a puncture needle, and one end of the puncture needle extends to the outside of the catheter seat;

The double-cavity injection structure is positioned at one side of the connecting sleeve and penetrates through the inner side of the catheter seat, and is used for simultaneously injecting two medicines;

The double-cavity injection structure comprises a runner pipe fixedly connected to one side of the connecting sleeve, one end of the runner pipe is fixedly connected with a fixing cap, a piston assembly is arranged in the fixing cap, the piston assembly comprises a thread groove, a second straight groove and a first straight groove which are formed in the inner side of the fixing cap, the inner side of the thread groove is in threaded connection with a thread sleeve, a second diversion hole penetrating to the outside is formed in the thread sleeve, and a first guide hole communicated with the second straight groove is formed in the inner side of the thread groove;

The piston assembly further comprises a fixed ring fixedly connected to the bottom of the threaded sleeve, and sealing rubber is fixedly connected to the outer side of the fixed ring;

A conical groove is arranged between the first straight groove and the second straight groove, and the sealing rubber is compressed through the conical groove;

The diameter of the first straight groove is smaller than that of the sealing rubber, the diameter of the sealing rubber is larger than that of the thread groove, and the diameter of the second straight groove is larger than that of the sealing rubber.

2. The double-cavity indwelling needle for drug-loaded myocardial perfusion examination according to claim 1, wherein one end of the flow tube penetrates through the connecting sleeve and extends to the inside of the catheter seat through the branch tube, a flow guide shell is fixedly connected to the inside of the catheter seat, and a liquid inlet of the flow guide shell is communicated with the flow tube.

3. The double-cavity indwelling needle for drug load myocardial perfusion examination as set forth in claim 2, wherein the double-cavity injecting structure further comprises a soft sleeve fixedly connected to the liquid outlet of the catheter seat, a first soft film is fixedly connected to the inner side of the soft sleeve and is attached to the outer wall of the puncture needle, a diversion trench is arranged between the first soft film and the soft sleeve, and a diversion port communicated with the diversion trench is formed in the diversion shell.

4. The dual-cavity indwelling needle for drug-loaded myocardial perfusion examination as set forth in claim 3, wherein a connecting spacer is fixedly connected to the bottom of the soft sleeve, a second soft membrane is fixedly connected to the bottom of the first soft membrane, and the second soft membrane is attached to the bottom of the connecting spacer.

5. The double-cavity indwelling needle for drug-loaded myocardial perfusion examination as set forth in claim 1, wherein a rubber block for blocking communication between the thread sleeve and the outside is fixedly connected to the inner side of the thread sleeve.