CN106860965A - Inner cannulated arteriovenous catheter - Google Patents

Abstract

This patent belongs to the field of medical devices, and specifically discloses an inner cannula type arteriovenous puncture indwelling needle, including: a puncture part, the puncture part is hollow tubular, the front end of the puncture part is provided with a wedge-shaped needle point, and the side wall of the puncture part along the diameter There is a through groove in the direction; the hand-held part is provided with an installation groove, the puncture part is fixed in the installation groove, and the front end of the puncture part extends out; the hose needle is provided with a plastic push plate at the end of the hose needle. The push plate is connected with the hose needle, the lower sides of both are embedded in the through groove and are slidingly connected with the inner wall of the puncture part, the hose needle is connected with the connection part, and the upper part of the connection part is fixedly connected with the push plate. The present invention aims at the technical problem that the existing indwelling needle is prone to bleeding when punctured, but the flexible needle is not inserted into the blood vessel with the steel needle core, and provides a new indwelling needle that can greatly improve the success rate of puncture and indwelling.

Description

Inner cannulated arteriovenous catheter

technical field

The invention relates to the field of medical devices, in particular to an inner cannula type arteriovenous puncture indwelling needle.

Background technique

Indwelling needle is a medical device that is often used in order to reduce the pain of patients and reduce the workload of medical staff when multiple infusion treatments are required within a certain period of time in medical treatment. In 2014, the National Health and Family Planning Commission issued the "Technical Operation Specifications for Intravenous Therapy and Nursing" in the form of industry standards, advocating the use of indwelling catheters in major hospitals. European and American countries only use steel needles to collect blood samples once for patients with thin blood vessels, and indwelling needles are used for other occasions. For patients undergoing surgery, in addition to the use of indwelling needles for intravenous infusion, continuous invasive arterial blood pressure monitoring is required, and arterial blood is collected through the arteries for blood gas analysis. Therefore, arteriovenous puncture and indwelling needles are also essential of.

The existing indwelling needles are usually wrapped with a flexible needle outside the steel core, and the flexible needle is slightly shorter than the steel core. When puncturing, the steel core and the flexible needle are inserted into the blood vessel at the same time. Insert the flexible needle to achieve the purpose of indwelling the flexible needle in the blood vessel.

However, in clinical practice, indwelling needles often fail to puncture, resulting in a low success rate of indwelling needle indwelling. One of the most important reasons for puncture failure is when the puncture needle penetrates into the blood vessel and sees the return of blood before placing the catheter. The flexible needle of the needle did not enter the blood vessel with the steel core, that is, the tip of the steel core pierced the blood vessel and was located in the blood vessel, but the flexible needle was blocked by the outer wall of the blood vessel and did not enter the blood vessel, which eventually led to the failure of catheterization. This situation occurs during arteriovenous puncture, and arterial puncture itself is more difficult than venous puncture, and the arterial wall is more elastic than the venous wall, so the relative failure rate is higher. In clinical practice, indwelling needle puncture failures often occur, and repeated operations greatly increase the suffering of patients, especially for children with low tolerance. If the indwelling needle can be successfully punctured once, the pain of the patient will be greatly reduced. Therefore, how to improve the way of indwelling needle puncture and indwelling tubes and improve the success rate of indwelling is a problem that clinical medical staff have been exploring.

Contents of the invention

Aiming at the technical problem of existing indwelling needles that the flexible needle does not enter the blood vessel along with the steel core, the present invention provides an inner cannula type arteriovenous puncture indwelling needle.

The basic plan provided by this plan is: inner cannulated arteriovenous puncture indwelling needle, including:

The puncture part, the puncture part is hollow tubular, the front end of the puncture part is provided with a wedge-shaped needle point, and the side wall of the puncture part is provided with a through groove along the radial direction;

The hand-held part is provided with an installation groove, the puncture part is fixed in the installation groove, and the front end of the puncture part extends out;

The hose needle is provided with a push plate made of plastic material at the end of the hose needle. The push plate is connected with the hose needle. The connecting part communicates, and the upper part of the connecting part is fixedly connected with the push plate.

The working principle and advantages of this solution are: when in use, the hose needle is an inner sleeve type, that is, the hose needle is located inside the puncture part. The medical staff pinches the hand-held part with their hands, and since the puncture part is fixed to the hand-held part, the medical staff can easily pierce the patient's skin and blood vessels with the puncture part. The puncture part is wrapped around the flexible needle, and after the puncture part enters the blood vessel and sees the return of blood, the push plate can be gently pushed forward. The inner wall of the puncture part is slidingly connected, and in the process of gently pushing the push plate, the hose needle will be exposed from the needle tip of the puncture part, and then the puncture part will be pulled out from the blood vessel.

The hose needle is flush with the lower side of the push plate, and the lower sides of both are embedded in the through groove and are slidably connected with the inner wall of the puncture part. The inner wall slides. After the puncture part is pulled out from the patient's blood vessel, continue to push the push plate to fully insert the flexible needle into the blood vessel, and then slide out the handle part and the puncture part through the channel, so that only the flexible needle is left in the blood vessel the goal of. When the puncture part penetrates into the blood vessel of the patient, since the puncture part is provided with a through groove, under normal circumstances, the through groove plays the role of preventing the wound from healing and accelerating bloodletting. However, in this solution, the hose needle is located inside the puncture part. When the puncture part pierces the blood vessel and gently pushes the push plate, the needle tip of the hose needle is exposed from the tip of the puncture part. The tip is directly exposed to the flowing blood, and under the washing of the blood, the tip of the hose needle will swing irregularly in the blood. The state of the hose needle in the blood is like a ribbon blowing in the wind. When the blood in the blood vessel surges outward through the channel, because the pressure inside the vessel is higher than the pressure outside the vessel, under the action of the pressure difference, the hose needle will block the channel to prevent blood from flowing out through the channel . The irregular swing of the hose needle in the blood can make the hose needle block the channel more quickly, preventing the blood from directly gushing out of the channel.

After the puncture part is pulled out, the wall of the blood vessel has strong elasticity, and the wound left by the puncture part on the blood vessel wall will have a tightening action. This tightening action will make the wound tighten the hose needle to prevent blood Flow out along the wound. In the existing indwelling needle, after the steel core punctures the blood vessel wall, the flexible needle penetrates into the blood vessel along the steel core. In this process, the flexible needle stretches the wound left by the steel core before entering the blood vessel. of. The existing method is easy to cause secondary damage to the blood vessel wall. After the blood vessel wall is punctured, this solution allows the blood vessel to have a tightening action, which will not cause secondary damage to the blood vessel wall, and is conducive to the healing of the wound on the blood vessel.

The puncture part of the existing indwelling needle is not provided with a through groove. When the puncture part without a through groove pierces the blood vessel, a circular wound will be formed on the blood vessel, and a circular blood vessel wall will be cut off from the blood vessel wall. Tissue, when the blood vessel wall heals, the blood vessel wall needs to heal a circular wound. The puncture part in this solution is provided with a through groove, which is equivalent to opening a gap on the tip of the puncture part. After the puncture part punctures the blood vessel, a part of the blood vessel wall is cut open, and a part of the tissue is connected with the blood vessel wall. It is equivalent to opening a door that can be opened and closed on the blood vessel wall. In this solution, when the vessel wall heals, an arc-shaped gap needs to be healed in the vessel wall. Compared with the prior art, the blood vessel walls of the patients who adopt this solution can heal faster.

In this solution, the inner cannula type inner cannula type arteriovenous puncture indwelling needle, as long as the steel needle at the puncture part penetrates the blood vessel, the flexible needle can follow the puncture part and directly enter the blood vessel under the wrapping of the puncture part. When the needle is withdrawn, What exits is the puncture part, and the flexible needle remains in the blood vessel. However, in the existing steel-core outer cannula indwelling needle, after the steel core punctures the blood vessel and sees the return of blood, it is necessary to continue to push the indwelling needle into the blood vessel by about 5mm, so that the hose needle of the outer sheath enters the blood vessel at the same time, and then pushes the hose again. At the same time, the needle withdraws the steel core to achieve the purpose of allowing the flexible needle to enter the blood vessel along the steel core, but this step requires high operation requirements, which leads to the failure of indwelling of the existing overcoat flexible needle. This solution omits this step, allowing the flexible needle to enter the blood vessel directly with the puncture part, which solves the technical problem that the flexible needle does not enter the blood vessel with the steel core, and makes it easier to indwell the flexible needle, thus greatly improving the success of the indwelling needle Rate.

Preferred Solution 1: As a preferred solution of the basic solution, the hose needle and the puncture part have the same length, and the rear end of the push plate is against the rear side wall of the installation groove. The length of the hose needle is equal to that of the puncture part, and when the medical staff uses the puncture part to puncture the patient's blood vessel, the hose needle will not slip inside the puncture part.

Preferred option 2: As an optimal option of preferred option 2: the puncture part is provided with a disposable seal made of PVC material, and the seal is bonded to cover the through groove. When the medical personnel use the puncture part to puncture the patient's blood vessel, the seal will cover the channel of the puncture part. At this time, the puncture part is a completed central channel, which further prevents blood from gushing out of the channel of the puncture part. After the indwelling of the tube needle is completed, the seal is torn off, so that the tube needle and the puncture part are separated, and the indwelling of the tube needle is completed.

The third preferred solution: the preferred solution of the third option: one end of the through groove is located at the shortest point of the wedge-shaped needle tip. With such a design, there is only one sharp point at the end of the puncturing part, which can facilitate the puncturing by medical personnel.

Description of drawings

Fig. 1 is a side view partial sectional view of the inner cannula type arteriovenous puncture indwelling needle of the present invention;

Fig. 2 is a top view of the inner cannula type arteriovenous puncture indwelling needle of the present invention;

Fig. 3 is a partial sectional view of the puncture of the present invention in the process of puncturing blood vessels;

Figure 4 is a side view of the hose needle of the present invention.

detailed description

The present invention will be described in further detail below by means of specific embodiments:

The reference signs in the drawings of the description include: puncture part 1 , handle part 2 , hose needle 3 , push plate 4 , through groove 5 , connecting part 6 , and vessel wall 7 .

Example 1

Basically as shown in Figure 1 and Figure 2: the inner sleeve type arteriovenous puncture indwelling needle, including:

The puncture part 1 is made of stainless steel. The puncture part 1 is hollow tubular. The front end of the puncture part 1 is provided with a wedge-shaped needle point. The side wall of the puncture part 1 is provided with a through groove 5 along the radial direction. the shortest point of the needle tip;

The handle 2 of plastic material is provided with an installation groove, and the puncture part 1 is fixed in the installation groove, and the length of the puncture part 1 exposed to the handle 2 is 3-6cm; the handle 2 of plastic material is provided with The installation groove, the puncture part 1 is fixed in the installation groove, and the length of the puncture part 1 extending out of the handle part 2 is 3-6cm. The connection part 6;

The hose needle 3 (as shown in Figure 4), the tail of the hose needle 3 is provided with a push plate 4 made of plastic material, the push plate 4 is parallel to the hose needle 3, and the surface of the push plate 4 is provided with a hole that runs through the entire surface of the push plate 4. Groove, the front end of the groove is low and the rear end is high, the hose needle 3 is embedded and bonded and fixed in the groove, the lower side of the hose needle 3 and the push plate 4 are both embedded in the through groove 5 and are both connected to the inner wall of the puncture part 1 Sliding connection, the rear end of the groove is provided with a connecting part 6 communicating with the heparin cap, the connecting part 6 is communicating with the hose needle 3, and the connecting part 6 is fixedly connected with the push plate 4.

During specific use: the medical personnel firstly penetrates the front end of the flexible tube needle 3 into the puncture part 1 , that is, the flexible tube needle 3 is located inside the puncture part 1 . The medical staff pinches the hand-held part 2 with their hands, and since the puncture part 1 and the hand-held part 2 are fixed, the medical staff can easily pierce the patient's skin and blood vessels with the puncture part 1 . The puncture part 1 wraps the hose needle 3, and after the puncture part 1 enters the blood vessel, push the push plate 4 lightly. The push plate 4 is parallel to the hose needle 3, and the surface of the push plate 4 is provided with a groove that traverses the entire surface of the push plate 4. The front end of the groove is low and the rear end is high, and the hose needle 3 is embedded in the groove. During the process, the flexible tube needle 3 will be exposed from the needle point of the puncture part 1, and then the puncture part 1 will be pulled out from the blood vessel.

The hose needle 3 is an inner sleeve type, that is, the hose needle 3 is located inside the steel core of the puncture part 1 . The medical staff pinches the hand-held part 2 with their hands, and since the puncture part 1 and the hand-held part 2 are fixed, the medical staff can easily pierce the patient's skin and blood vessel wall 7 (as shown in Figure 3 ) with the puncture part 1 . The puncture part 1 wraps the hose needle 3. After the puncture part 1 enters the blood vessel and sees blood returning, the push plate 4 can be gently pushed forward. The push plate 4 is connected to the hose needle 3, and the lower sides of the two are embedded The grooves are all slidably connected with the inner wall of the puncture part 1. In the process of gently pushing the push plate 4, the hose needle 3 will be exposed from the needle point of the puncture part 1, and then the puncture part 1 will be pulled out from the blood vessel.

Example 2

Compared with Embodiment 1, the only difference is that the handle part 2 is a cuboid, and the puncture part 1 is provided with a PVC material disposable seal, which covers the through groove 5 by bonding. When the medical personnel use the puncture part to puncture the patient's blood vessel, the seal will cover the through groove of the puncture part. At this time, the puncture part is a completed central passageway, which further prevents blood from gushing out from the through groove 5 of the puncture part 2. After the flexible tube needle 3 is left indwelling, the seal is torn, and the flexible tube needle and the puncture part are separated, and the flexible tube needle is left in place.

Comparative example 1

The Y-type indwelling needle produced by Shanghai Puyi Medical Instrument Co., Ltd. was used.

Select 690 14-week-old rabbits in a laboratory from 2015 to 2016, divide them into three groups at random, use three kinds of indwelling needles in Example 1, Example 2, and Comparative Example 1, and perform rabbit hind legs respectively. In the venipuncture indwelling experiment, the success rate of venipuncture in the three groups of rabbits was compared and the reasons for the failure were analyzed. Results: The results of the first and second groups were significantly different from those of the third group (P<0.05), which was statistically significant.

The selected rabbits were about 15 weeks old, belonged to the same batch and the same breed, and there was no significant difference in age and gender among the three groups of rabbits.

The 6 nurses who participated in the experiment were all working in the emergency department for more than five years, with the title of nurse or above, and received unified operation training.

Use the same piercing method.

The success rate of one-time puncture catheterization was observed in the three groups.

group total number of cases success Success rate(%) fail(%) Example 1 240 231 96.25 3.75 Example 2 220 214 97.27 2.73 Comparative example 1 230 201 87.39 12.61

Through the comparison of Example 1 and Example 2, it is found that adding a seal can slightly improve the success rate of indwelling needle indwelling.

Through the comparison of Example 1 and Comparative Example 1, it is found that this solution can greatly improve the success rate of indwelling needles compared with the prior art.

What is described above is only an embodiment of the present invention, and common knowledge such as specific structures and characteristics known in the scheme are not described here too much. It should be pointed out that for those skilled in the art, under the premise of not departing from the structure of the present invention, several modifications and improvements can also be made, and these should also be regarded as the protection scope of the present invention, and these will not affect the implementation of the present invention. Effects and utility of patents. The scope of protection required by this application shall be based on the content of the claims, and the specific implementation methods and other records in the specification may be used to interpret the content of the claims.

Claims (4)

1. Inner sleeve type arteriovenous puncture indwelling needle, is characterized in that, comprises: The puncture part, the puncture part is hollow tubular, the front end of the puncture part is provided with a wedge-shaped needle point, and the side wall of the puncture part is provided with a through groove along the radial direction; The hand-held part is provided with an installation groove, the puncture part is fixed in the installation groove, and the front end of the puncture part extends out; The hose needle is provided with a push plate made of plastic material at the end of the hose needle. The push plate is connected with the hose needle. The connecting part communicates, and the upper part of the connecting part is fixedly connected with the push plate. 2. The indwelling needle for arteriovenous puncture with inner cannula according to claim 1, wherein the length of the flexible needle is equal to that of the puncture part, and the rear end of the push plate abuts against the rear side wall of the installation groove. 3. The inner cannula type arteriovenous puncture indwelling needle according to claim 2, characterized in that, the puncture part is provided with a PVC material disposable seal, and the seal is bonded to cover the through groove. 4. The indwelling needle for arteriovenous puncture with inner cannula according to any one of claims 1-3, wherein one end of the channel is located at the shortest point of the oblique wedge-shaped needle tip.