CN116509465A - Pelvic cavity cyst biopsy puncture outfit with flushing device - Google Patents

Abstract

The invention relates to the technical field of medical appliances, in particular to a pelvic cavity cyst biopsy puncture outfit with a flushing device, which comprises a puncture needle body and a firing component, wherein the puncture needle body comprises a needle core and a needle sleeve, the needle core is arranged in an inner cavity of the needle sleeve and can be separated from the needle sleeve, the length of the needle core is larger than that of the needle sleeve, a sampling groove is further formed in one side of the needle core, close to a spike structure of the needle core, of the needle sleeve, the biopsy puncture outfit further comprises a suction component, the suction component comprises a joint component and a suction component, and the suction component can enable negative pressure to be generated in the needle sleeve under the running state. According to the invention, the suction part is arranged to enable the inside of the needle sleeve to generate negative pressure, the end part of the needle sleeve can be adsorbed on the surface of the target part in the process of puncturing operation, the target part is supported, the deformation of the target part in the puncturing process is reduced, the risk of deviating from a set path in the process of puncturing/exiting the target part by the needle core is reduced, and the accuracy and the efficiency of puncturing and sampling are improved.

Description

A puncture device for cyst biopsy in the pelvic cavity with a flushing device

technical field

The invention relates to the technical field of medical instruments, in particular to a pelvic cyst biopsy puncture device with a flushing device.

Background technique

Biopsy is the abbreviation of "biological tissue examination", also known as surgical pathological examination, which refers to the technique of extracting diseased tissue samples from the patient's body for pathological examination in response to the needs of diagnosis and treatment.

At present, the commonly used method for extracting tissue samples clinically is needle biopsy. Puncture biopsy is a method of penetrating a biopsy needle into the target site under the guidance of ultrasound or CT, and using the sampling groove set on the puncture needle to take out the tissue strip of the target site for pathological diagnosis. The needle biopsy method has the remarkable characteristics of small trauma, easy operation, fast healing, and few complications. It is one of the important methods for obtaining visceral tissue samples in clinical practice. However, there are still deficiencies, as follows:

When the puncture needle penetrates the target site, the target site will fluctuate with the patient's breathing and heartbeat, so that the puncture needle may deviate from the set path during the puncture sampling process, and the puncture needle and the target site Contact, the force exerted by the puncture needle will cause a certain degree of deformation of the target site, which further increases the risk of the puncture needle deviating from the set path during the puncture sampling process, resulting in low accuracy and efficiency of puncture sampling, and repeated puncture It will also cause great harm to the patient's body.

Therefore, how to improve the accuracy of puncture sampling, and then avoid repeated punctures from causing greater damage to the patient's body, is a technical problem to be solved urgently in the prior art.

Contents of the invention

The purpose of the present invention is to aim at the problems existing in the prior art. When the puncture needle penetrates into the target site, the target site will fluctuate and displace along with the patient's respiration and heartbeat. In this way, the puncture needle may deviate during the puncture sampling process. In the case of setting the path, and the puncture needle is in contact with the target site, the force exerted by the puncture needle will cause a certain degree of deformation of the target site, which further increases the risk of the puncture needle deviating from the set path during the puncture sampling process, resulting in The accuracy and efficiency of puncture sampling are not high, and repeated puncture will cause serious harm to the patient's body. A pelvic cyst biopsy puncture device with a flushing device is provided.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A pelvic cyst biopsy puncture device with flushing device, comprising a puncture needle body and a firing part, the puncture needle body includes a needle core and a needle sleeve, a needle seat is provided at one end of the needle sleeve, and the firing part is detachable fixed on the needle seat, the needle core is arranged in the inner cavity of the needle sleeve, and the needle core can be separated from the needle sleeve, one end of the needle core is set as a spike structure, and the other One end is connected to the firing part, and a sampling groove is provided on the side of the needle core near its spike structure, and the needle core is driven by the firing part along the direction of the needle sleeve away from the needle seat. Sliding on one side can make the sampling groove completely exposed out of the needle cover; the needle core can slide along the needle cover to one side of the needle seat driven by the firing part, so that the The sampling groove is hidden in the inner cavity of the needle cover, the biopsy piercer also includes a suction component, the suction component includes a joint assembly and a suction assembly, the joint assembly is arranged on the needle seat, the The suction assembly is connected with the joint assembly, and the suction assembly can generate negative pressure inside the needle cover under the running state.

Preferably, the needle core includes a first section and a second section, the sampling groove is arranged on the first section, the diameter of the first section is larger than the diameter of the second section, Driven by the firing component, the needle core slides along the side of the needle sheath facing away from the needle hub, so that the first section is completely exposed to the outside of the needle sheath.

Preferably, an arc-shaped smooth transition section is provided at the intersection of the first section and the second section, and the smooth transition section is used to eliminate the gap between the first section and the second section. The step structure formed between them.

Preferably, the end of the needle sheath facing away from the needle hub is provided with an extension, and the extension is used to increase the contact area between the end of the needle sheath and the target site.

Preferably, the extension part is arranged on one side of the cavity of the needle cover.

Preferably, the extension part is configured as a ring structure, the extension part is connected to the inner wall of the needle cover, and a gap is provided between the extension part and the inner wall of the needle cover.

Preferably, the width of the gap between the extension part and the inner wall of the needle cover is a, the width of the gap between the extension part and the needle core is b, where a>b.

Preferably, the extension part is detachably connected to the needle cover.

Preferably, the joint assembly includes a hose and a three-way joint, the hose is connected to the needle hub, and the three-way joint is arranged at the end of the hose.

Preferably, a scale is provided on the surface of the needle sheath, and an ultrasonic display area is provided on the spike structure of the needle core.

Preferably, the puncture device further includes a flushing assembly connected to the three-way joint, and the flushing assembly cooperates with the needle sleeve to inject medicine into the patient's body.

In summary, owing to adopting above-mentioned technical scheme, the beneficial effect of the present invention is:

1. A puncture device for pelvic cyst biopsy with a flushing device according to the present invention, the suction part is set so that negative pressure can be generated inside the needle sheath, and during the puncture operation, the end of the needle sheath The part can be adsorbed on the surface of the target site, suppressing the undulating displacement of the target site with the patient's breathing and heartbeat, and the needle sheath can also support the target site, reducing the deformation of the target site during the puncture process, and the needle core The risk of deviating from the set path during the process of penetrating into/exiting the target site is reduced, and the accuracy and efficiency of puncture sampling are improved. Moreover, in this embodiment, the suction part cooperates with the needle sheath to suck out the blood and tissue fragments generated during the puncture of the target site out of the body, reducing the transfer and diffusion of cells at the target site to other sites during the puncture process. site risk, thereby improving the safety of the present invention in the use of puncture sampling;

2. In the pelvic cyst biopsy puncture device with flushing device according to the present invention, a gap is set between the extension part and the inner wall of the needle sleeve, and the gap between the extension part and the inner wall of the whole set is set The width is larger than the gap between the extension part and the needle core, so that the negative pressure suction generated on the side of the inner wall of the needle sheath is greater than the negative pressure suction generated on the side of the needle core, and the target site is broken The tissue at the site can be attracted more to the side of the needle sheath close to its inner wall, avoiding the tissue at the breach site of the target site from being attracted to the gap between the second segment and the needle sheath to cause blockage, improving It ensures the smoothness of the discharge of fluid and tissue debris generated at the target site;

3. A pelvic cyst biopsy puncture device with a flushing device according to the present invention, the diameter of the second segment is set to be smaller than the diameter of the first segment, and the target site is pierced at the first segment After entering the tissue, the end of the needle sheath can form a larger adsorption area, thereby generating greater negative pressure suction, making the tissue at the target site more closely attached to the sampling groove, improving the smoothness after cutting the tissue at the target site. It reduces the amount of bleeding and fragments generated by the target tissue after sampling, thereby further reducing the risk of cell transfer and spreading to other parts of the target site during the puncture process. Moreover, the needle sheath generates greater negative pressure suction, which makes the tissue of the target site adhere to the sampling groove, and further suppresses the deformation of the target site during the sampling process, thereby improving the accuracy and efficiency of puncture sampling.

Description of drawings

Fig. 1 is a kind of structure schematic diagram of the first embodiment of the intrapelvic cyst biopsy puncture device with flushing device;

Fig. 2 is a schematic diagram of the axial structure of the puncture needle body in a pelvic cyst biopsy puncture device with a flushing device;

Fig. 3 is a schematic cross-sectional structure diagram of the puncture needle body in a pelvic cyst biopsy puncture device with a flushing device;

Fig. 4 is a schematic structural view of A in Fig. 3;

Fig. 5 is a structural schematic diagram of a second embodiment of a pelvic cyst biopsy puncture device with a flushing device.

Marks in the figure: 1-puncture needle body, 2-firing part, 3-needle core, 4-needle sleeve, 5-sampling slot, 6-suction part, 7-joint assembly, 8-suction assembly, 9-first Segment, 10-second segment, 11-extended part, 12-hose, 13-tee joint, 14-flushing assembly.

Detailed ways

Below in conjunction with accompanying drawing, the present invention is described in detail.

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Example 1

As shown in Fig. 1 and Fig. 2, a puncture device for pelvic cyst biopsy with a flushing device according to the present invention includes a puncture needle body 1 and a firing part 2, and the puncture needle body 1 includes a needle core 3 and a needle sheath 4. One end of the needle cover 4 is provided with a needle seat, the firing part 2 is detachably fixed on the needle seat, the needle core 3 is arranged in the inner cavity of the needle cover 4, and the The needle core 3 can be separated from the needle sheath 4, one end of the needle core 3 is provided with a spike structure, and the other end is connected to the firing part 2, and the needle core 3 is also provided on the side of the needle core 3 with the spike structure There is a sampling groove 5, the needle core 3 is driven by the firing part 2 and slides along the needle cover 4 to the side away from the needle seat, so that the sampling groove 5 can be completely exposed on the needle cover 4; the needle core 3 is driven by the firing part 2 to slide along the needle cover 4 to one side of the needle seat, so that the sampling groove 5 can be hidden inside the needle cover 4 In the cavity, the biopsy needle also includes a suction part 6, and the suction part 6 includes a joint assembly 7 and a suction assembly 8, the joint assembly 7 is arranged on the needle seat, and the suction assembly 8 is connected to the suction assembly. The joint assembly 7 is connected, and the suction assembly 8 can generate negative pressure inside the needle sheath 4 under the running state.

Using a pelvic cyst biopsy puncturer with a flushing device according to the present invention, setting the suction part 6 can make the inside of the needle sheath 4 generate negative pressure. During the puncture operation, the needle sheath 4 The end of the needle sheath 4 can be adsorbed on the surface of the target site to suppress the undulating displacement of the target site with the patient's breathing and heartbeat, and the needle sheath 4 can also support the target site to reduce the deformation of the target site during the puncture process. The risk of deviating from the set path during the needle core 3 piercing into/exiting the target site is reduced, and the accuracy and efficiency of puncture sampling are improved. Moreover, in this embodiment, the suction member 6 cooperates with the needle sheath 4, and can also suck out blood and tissue fragments generated during the puncture of the target site, reducing the transfer and diffusion of cells at the target site during the puncture process. risk to other parts, thereby improving the safety of the present invention in the use of puncture sampling.

Specifically, in the embodiment, before performing the puncture sampling operation, guide the patient to pose in an appropriate position according to the different sampling sites, so as to facilitate the operator to operate; lay a sterile pad on the skin at the needle insertion site, and After the skin is disinfected, lidocaine is used to anesthetize the needle insertion site, and then guided by B-ultrasound or CT, the puncture needle body 1 is punctured into the patient's body until the end of the puncture needle body 1 After reaching the position of the target site, use the firing part 2 to retract the spike structure of the needle core 3 into the needle sheath 4, and then open the suction part 6 to form a negative pressure in the needle sheath 4 , and then the end of the needle sheath 4 is adsorbed on the surface of the target site, and then the firing part 2 is used again to push the needle core 3 into the inside of the target site, and after reaching the set position, the trigger is pulled The trigger on the component 2, the needle core 3 is quickly retracted into the inner cavity of the needle sheath 4 under the elastic force of the spring, during this process, the sampling groove 5 cuts the tissue inside the target site to complete the sampling operation , and the sampling groove 5 can be retracted into the needle sheath 4 to seal the sampled tissue strips, further reducing the risk of cell transfer and diffusion to other parts of the target site during the puncture process.

On the other hand, in this embodiment, the suction member 6 is set so that negative pressure is generated inside the needle sheath 4, and after the needle core 3 penetrates into the inside of the target site, under the action of negative pressure suction, the target site The tissue can be more closely attached to the sampling groove 5, so that the cut surface formed after the sampling groove 5 cuts the target tissue can be smoother, and then the amount of bleeding and fragments generated by the target tissue after sampling is less, and the puncture rate is further reduced. During the process, the target site cells may transfer and spread to other sites. At the same time, under the action of negative pressure suction, the tissue of the target part is tightly attached to the sampling groove 5, which can further suppress the deformation of the target part during the sampling process, thereby improving the accuracy and efficiency of puncture sampling. In this embodiment, the suction assembly 8 includes a medical negative pressure vacuum pump and a negative pressure bottle. The medical negative pressure vacuum pump communicates with the negative pressure bottle, and the liquid and tissue fragments sucked from the patient's body can be stored in the negative pressure bottle.

Example 2

As shown in FIG. 3 , a pelvic cyst biopsy trocar with a flushing device according to the present invention, on the basis of the above method, further, the needle core 3 includes a first segment 9 and a second segment 10 , the sampling groove 5 is arranged on the first section 9, the diameter of the first section 9 is larger than the diameter of the second section 10, and the needle core 3 is driven by the firing part 2 Sliding down along the side of the needle sheath 4 facing away from the needle hub can make the first segment 9 completely exposed to the outside of the needle sheath 4 .

In this embodiment, the diameter of the second segment 10 is set to be smaller than the diameter of the first segment 9, and after the first segment 9 penetrates into the tissue of the target site, the end of the needle sheath 4 A larger adsorption area can be formed, thereby generating greater negative pressure suction, so that the tissue at the target site is closer to the sampling groove 5, which improves the flatness of the tissue at the target site after cutting, and reduces the generation of tissue at the target site after sampling. The amount of bleeding and debris is reduced, which further reduces the risk of cell transfer and spread to other parts of the target site during the puncture process. Moreover, the needle sheath 4 generates greater negative pressure suction, making the tissue of the target site close to the sampling groove 5, further suppressing the deformation of the target site during the sampling process, thereby improving the accuracy and efficiency of puncture sampling .

On the other hand, the diameter of the first section 9 is set larger, and the first section 9 can be more completely discharged from the needle sheath 4 during the process of retracting into the interior of the needle sheath 4 liquid and tissue fragments, reducing the risk of contamination of the tissue strips in the sampling tank 5. In this embodiment, when the first segment 9 retracts to the inside of the needle sheath 4, the suction part 6 stops running, so as to prevent the needle sheath 4 Inhalation of body fluids, causing contamination of biopsy samples.

As a preferred embodiment, on the basis of the above method, further, the junction of the first segment 9 and the second segment 10 is provided with an arc-shaped smooth transition section, and the smooth transition section is used to eliminate A stepped structure formed between the first segment 9 and the second segment 10 .

In the above embodiment, the firing part 2 drives the needle core 3 to slide along the side of the needle sheath 4 facing away from the needle hub, so that the first segment 9 is completely exposed on the needle sheath 4 After that, the firing part 2 needs to continue to push out the second segment 10 to a certain length, so as to prevent the first segment 9 from affecting the negative pressure suction generated by the needle sheath 4 . After performing this operation, a part of the pushed-out second section 10 will enter into the tissue of the target site, while the first section 9 is retracted into the needle sheath 4, so The step structure formed by the first segment 9 and the second segment 10 has a high probability of causing secondary damage to the target tissue, resulting in increased bleeding and debris in the target tissue after sampling, which affects puncture sampling. security. Based on this, in this embodiment, an arc-shaped smooth transition section is provided at the junction of the first section 9 and the second section 10, and the smooth transition section can eliminate the first section The step structure formed between 9 and the second segment 10 makes the overall structure of the needle core 3 smoother and reduces the gap between the first segment 9 and the second segment 10 during puncture sampling. The damage caused to the target site by the step structure formed at the junction site, in particular, reduces the damage to the target site caused by the retraction of the first segment 9 into the needle sheath 4, thereby further reducing the damage to the target site tissue after sampling. The resulting amount of bleeding and debris improves the safety of the present invention in practical use.

Example 3

As shown in Figures 1 to 4, in the pelvic cyst biopsy trocar with flushing device according to the present invention, on the basis of the above method, further, the end of the needle sheath 4 facing away from the needle seat is The extension part 11 is provided on the upper part, and the extension part 11 is used to increase the contact area between the end part of the needle sheath 4 and the target site. With this structure, the pressure exerted by the end of the needle sheath 4 on the target site can be reduced, and the damage caused by the adsorption of the end of the needle sheath 4 on the surface of the target site to the tissue of the target site can be reduced, thereby further reducing the pressure on the target site. The risk of cell transfer and spread to other parts of the target site during the puncture process.

As a preferred embodiment, on the basis of the above method, further, the extension part 11 is arranged on one side of the cavity of the needle sheath 4 .

As a preferred embodiment, on the basis of the above method, further, the extension part 11 is set as a ring structure, the extension part 11 is connected to the inner wall of the needle sheath 4, and the extension part 11 is connected to the There is a gap between the inner walls of the needle sheath 4, the width of the gap between the extension part 11 and the inner wall of the needle sheath 4 is a, the width of the gap between the extension part 11 and the needle core 3 is b , a>b.

In the above-mentioned embodiment, setting the suction part 6 can make the inside of the needle sheath 4 generate negative pressure. During the puncture operation, the end of the needle sheath 4 can be adsorbed on the surface of the target site, inhibiting the target. The part moves with the ups and downs of the patient's breathing and heartbeat, and the needle sheath 4 can also support the target part, reducing the deformation of the target part during the puncture process, and then the needle core 3 penetrates into/withdraws from the target part The risk of deviating from the set path is reduced, and the accuracy and efficiency of puncture sampling are improved. However, there are still deficiencies: after the first segment 9 penetrates into the tissue of the target site, the tissue at the breach site of the target site will be sucked into the gap between the second segment 10 and the needle sheath 4 under the action of negative pressure. In the gap, the cavity structure of the needle sheath 4 is blocked, making it difficult to discharge the liquid and tissue fragments generated at the puncture target site smoothly, increasing the risk of cell transfer and diffusion to other sites at the target site. Therefore, in this embodiment, a gap is provided between the extension part 11 and the inner wall of the needle sheath 4, and the width of the gap between the extension part 11 and the entire set of inner walls is set to be larger than that between the extension part 11 and the inner wall of the needle sheath 4. The gap between the needle core 3, so that the negative pressure suction generated by the side of the needle sheath 4 close to its inner wall is greater than the negative pressure suction generated by the side of the needle core 3, and then the tissue at the target site breach can be more Many of them are attracted to the side of the inner wall of the needle sheath 4, which avoids the tissue at the opening of the target site from being attracted to the gap between the second segment 10 and the needle sheath 4 to cause blockage, and improves the target Fluid and tissue debris produced by the site can be drained smoothly.

As a preferred embodiment, on the basis of the above method, further, the extension part 11 and the needle sheath 4 are detachably connected.

Specifically, a block is provided on the side of the extension part 11, and a slot is provided on the inner wall of the needle sheath 4. Through the cooperation between the block and the slot, the extension part 11 and the A detachable connection is realized between the needle sockets 4 . When the present embodiment is in use, if the puncture site is a soft and easily deformable tissue, the extension part 11 is provided at the end of the needle sheath 4 to utilize the stronger negative force produced by the needle sheath 4 near its inner wall. The suction force prevents the tissue at the breach site from being attracted to the gap between the second segment 10 and the needle sheath 4 to cause blockage, and the extension part 11 can increase the opening of the needle sheath 4 end The contact area between the target site and the target site reduces the pressure applied by the end of the needle sheath 4 on the target site, reducing the damage to the target site tissue caused by the adsorption of the end of the needle sheath 4 on the surface of the target site; When the part is a tissue that is flexible and not easy to deform, removing the extension part 11 can maximize the negative pressure suction generated by the needle sheath 4 .

Example 4

As shown in Figure 5, a pelvic cyst biopsy puncture device with a flushing device according to the present invention, on the basis of the above method, further, the joint assembly 7 includes a hose 12 and a three-way joint 13, the A hose 12 is connected to the needle base, and the three-way joint 13 is arranged at the end of the hose 12 .

As a preferred embodiment, on the basis of the above method, further, the trocar also includes a flushing assembly 14, the flushing assembly 14 is connected to the three-way joint 13, and the flushing assembly 14 is matched with the needle sheath 4 Drugs may be injected into the patient's body.

Specifically, in this embodiment, after determining the injection site, the puncture needle body 1 is punctured into the patient's body, and after reaching the set position, the firing part 2 is removed from the needle holder, and the needle After the core 3 is pulled out from the needle cover, the flushing component 14 is used to pressurize the medicine, and then the medicine passes through the flexible tube 12, the needle seat and the needle cover 4 to reach the set position in sequence. In this embodiment, the flushing component 14 is configured as a syringe, or a medical syringe pump.

As a preferred embodiment, on the basis of the above method, further, the surface of the needle sheath 4 is provided with a scale, and the spike structure of the needle core 3 is provided with an ultrasonic display area.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (10)

1. A puncture device for cyst biopsy in the pelvic cavity with a flushing device, characterized in that it comprises a puncture needle body and a percussion component, the puncture needle body includes a needle core and a needle cover, and one end of the needle cover is provided with a needle seat, The firing part is detachably fixed on the needle seat, the needle core is arranged in the inner cavity of the needle sleeve, and the needle core can be separated from the needle sleeve, and one end of the needle core is set It is a spike structure, the other end is connected with the firing part, and the needle core is provided with a sampling groove on the side of the spike structure, and the needle core is driven by the firing part along the direction of the needle sleeve. Sliding on the side away from the needle seat can completely expose the sampling groove to the outside of the needle cover; side sliding, the sampling groove can be hidden in the inner cavity of the needle cover, the biopsy piercer also includes a suction part, and the suction part includes a joint assembly and a suction assembly, and the joint assembly is arranged on the On the needle seat, the suction assembly is connected with the joint assembly, and the suction assembly can generate negative pressure inside the needle cover under the running state. 2. The intrapelvic cyst biopsy puncturer with flushing device according to claim 1, wherein the needle core comprises a first segment and a second segment, and the sampling groove is arranged at the first segment In the section, the diameter of the first section is larger than the diameter of the second section, and the needle core is driven by the firing part to slide along the side of the needle sleeve away from the needle seat, so that The first section is completely exposed from the needle guard. 3. The intrapelvic cyst biopsy puncture device with a flushing device according to claim 2, wherein an arc-shaped smooth transition section is provided at the junction of the first section and the second section, and The smooth transition section is used to eliminate the step structure formed between the first section and the second section. 4. The intrapelvic cyst biopsy puncture device with a flushing device according to claim 3, wherein an extension part is provided at the end of the needle sheath away from the needle seat, and the extension part is used to increase the The contact area between the end of the needle guard and the target site is large. 5 . The intrapelvic cyst biopsy puncture device with flushing device according to claim 4 , wherein the extension part is arranged on one side of the cavity of the needle sleeve. 5 . 6. The intrapelvic cyst biopsy puncture device with flushing device according to claim 5, characterized in that, the extension part is arranged as a ring structure, the extension part is connected on the inner wall of the needle sheath, and the extension part There is a gap between the extension part and the inner wall of the needle cover; the gap width between the extension part and the inner wall of the needle cover is a, and the gap width between the extension part and the needle core is b , a>b. 7 . The intrapelvic cyst biopsy puncture device with flushing device according to claim 6 , wherein the extension part is detachably connected to the needle sheath. 8 . 8. The intrapelvic cyst biopsy puncturer with flushing device according to claim 1, wherein the connector assembly includes a flexible pipe and a three-way connector, the flexible pipe is connected to the needle seat, and the A tee joint is provided at the end of the hose. 9 . The intrapelvic cyst biopsy puncture device with flushing device according to claim 1 , wherein a scale is provided on the surface of the needle sheath, and an ultrasonic display area is provided on the spike structure of the needle core. 10 . 10. The pelvic cyst biopsy puncture device with flushing device according to claim 8, characterized in that, the puncture device also includes a flushing assembly connected to the three-way joint, and the flushing assembly is connected to the three-way joint. The combination of the above-mentioned needle cover can inject medicine into the patient's body.