CN112971937A

CN112971937A - Puncture catheter needle assembly suitable for continuous nerve block

Info

Publication number: CN112971937A
Application number: CN202110210853.8A
Authority: CN
Inventors: 祝恒
Original assignee: Individual
Current assignee: Nanchang Biotek Medical Technology Co ltd
Priority date: 2021-02-25
Filing date: 2021-02-25
Publication date: 2021-06-18
Anticipated expiration: 2041-02-25
Also published as: CN112971937B

Abstract

The invention provides a puncture catheter needle assembly suitable for continuous nerve block, which comprises a puncture catheter, a knob, a puncture needle head and a non-translation driving mechanism, wherein the tail end of the puncture catheter and the head end of the knob are fixedly arranged, the puncture needle head is arranged in a tube cavity of the puncture catheter and is close to the head end of the puncture catheter, the length of the puncture needle head is far shorter than that of the puncture catheter, the head end of the puncture catheter is provided with a structure for protecting the puncture needle head and for buffering and preventing the puncture catheter from further approaching a compact nerve sheath membrane, and the non-translation driving mechanism comprises a rotating rod for driving the structure and the puncture needle head to generate relative displacement so that the puncture needle head is accommodated in the structure. The invention achieves the effects of safety and accuracy on the premise of ensuring that the nerve tissues are not damaged.

Description

Puncture catheter needle assembly suitable for continuous nerve block

Technical Field

The invention relates to the technical field of medical appliances, in particular to a puncture catheter needle assembly suitable for continuous nerve block.

Background

The continuous nerve block technology is that a catheter is precisely kept near a target nerve, and local anesthetic is injected near the target nerve through a catheter opening to achieve the purposes of anesthesia and pain treatment. The medical devices used in the continuous nerve block technology face two contradictory problems of safety and accuracy. The safety mainly means that the puncture needle can be carelessly punctured into the target nerve to cause nerve injury in the operation process, and the accuracy requires that the opening of the catheter is as close as possible to even contact the target nerve, so that the medicine can be favorably and accurately flowed onto the target nerve to play the medicine effect. With the application of techniques such as ultrasound to nerve block techniques for clinical anesthesia, it has been possible to approach a target nerve with a puncture needle under ultrasound guidance and to place a thin and soft catheter around the target nerve through the puncture needle. However, the ultrasound has poor image definition and operator error, which may cause nerve injury due to the puncture needle directly puncturing nerves.

The nerve block puncture catheter needle with the adjustable puncture head disclosed in the authorization publication number CN104000639B mainly comprises a puncture catheter and a puncture needle core. When in operation, the puncture needle core is sleeved into the puncture catheter, and the tip of the puncture needle core extends out of the port of the puncture catheter and has sharpness; when the catheter needle is close to a target nerve under the guidance of ultrasonic waves, the tip of the puncture needle core can be retracted into the puncture catheter through regulation and control, the catheter needle loses sharpness but has toughness and can still continuously penetrate through fascia soft tissues to be close to the nerve until the nerve is touched, the needle tip is retracted into the catheter to lose sharpness, the nerve cannot be damaged, the needle head end of the catheter reaches the target position, and the puncture needle core can be directly withdrawn to keep the puncture catheter around the nerve for the treatment application of anesthesia administration or continuous analgesia and the like in the future.

However, the scheme still has the following defects: firstly, need rotate handle back handle after the handle is kneaded in the puncture needle body stretches out the shrink in-process, and handle back handle displacement before kneading the handle meeting: especially, the length of the whole catheter needle is lengthened in the process of pushing the rear handle of the handle back, which is not beneficial to the operation in a certain space; secondly, the liquid inlet pipe passes through the rear handle of the handle, so that the liquid inlet pipe can also rotate in the rotating process of the rear handle of the handle, and the liquid inlet pipe is inconvenient to be connected to an external injector interface or a clinical continuous drug delivery system; thirdly, the puncture needle body is positioned in the puncture catheter except the space reserved at the head part, so that the liquid injection amount and speed are influenced on the premise of a certain inner diameter of the puncture catheter, and manufacturing materials are increased, so that the manufacturing cost is increased; fourthly, because the head of the puncture catheter is flat, although the tip of the puncture needle core retracts into the port of the puncture catheter, the head of the puncture catheter still can cause puncture pain when being punctured.

Disclosure of Invention

The present invention has been made to solve the above-mentioned problems occurring in the prior art, and an object of the present invention is to provide a catheter and needle assembly for continuous nerve block.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides a puncture catheter needle subassembly suitable for continuous nerve block, includes puncture catheter, holds between the fingers handle, puncture needle head and the actuating mechanism who does not have the translation, puncture catheter's tail end is fixed with the head end installation of holding between the fingers the handle, puncture needle head installs in puncture catheter's lumen, and is close to the head end department at puncture catheter, puncture needle head's length is less than puncture catheter's length far away, puncture catheter's head end has and is used for protecting puncture needle head and is used for the buffering and prevents puncture catheter further to urge the structure of thorn to fine and close nerve sheath membrane, the actuating mechanism who does not have the translation includes the bull stick, is used for the drive relative displacement takes place between structure and the puncture needle head, makes this puncture needle head accomodate in the structure.

Preferably, the structure comprises a foldable tube body and an elastic body, the tube body is integrated with the puncture catheter, and the elastic body is fixed with the head end of the tube body.

Preferably, the tube body is corrugated and provided with a leak hole, the top of the tube body is flush with the outer wall of the puncture catheter in an initial state, the bottom of the tube body is flush with the inner wall of the puncture catheter or a space is reserved between the bottom of the tube body and the inner wall of the puncture catheter, and the elastic body is hemispherical or trumpet-shaped.

Preferably, the driving mechanism without translation further comprises a push block, the rotating rod is provided with a cavity, the rotating rod is inserted into the tail end of the pinching handle and is in running fit with the pinching handle, the push block is installed in the circular cavity and is in threaded connection with the circular cavity, the push block is provided with a push rod, the head end of the push rod penetrates through the pinching handle and the puncture catheter in sequence and is used for pushing the elastomer, and the elastomer is provided with a hole for the puncture needle to pass through.

Preferably, the cavity and the push block are circular, the push rods are symmetrically arranged, the pinching handle and the puncture catheter are provided with insertion holes which are communicated in a penetrating way, and the push rods are inserted into the insertion holes.

Preferably, the rotating rod is sleeved with an installation block with a bearing, the rotating rod is plugged into or screwed on the handle knob through the installation block, and the tail end of the rotating rod leaks outwards and is provided with the rotating handle.

Preferably, the puncture needle further comprises a liquid inlet pipe, and the head end of the liquid inlet pipe sequentially penetrates through the rotating rod, the channel reserved on the push block and in the knob handle and is communicated with the tube cavity of the puncture catheter.

Preferably, the puncture catheter is provided with a gripping handle with a lock catch, and a sucker is arranged on one surface of the gripping handle close to the head end of the puncture catheter through a bolt.

Compared with the prior art, the invention has the beneficial effects that:

according to the invention, the purpose of arranging the elastic body can be realized, when the catheter needle assembly is further forced to the target nerve, the buffer effect can be realized, the possibility of damaging the nerve by penetrating a compact nerve sheath membrane can be further realized, and the pain caused by the penetration can be greatly reduced when the puncture catheter is further penetrated to approach the target nerve.

According to the invention, in an initial state, the tube body is a corrugated tube which can be conveniently stretched and retracted, when the catheter needle punctures and approaches a target, the corrugated tube can wrap and enclose the puncture needle head when the puncture needle head retracts into the puncture catheter, and when the catheter needle approaches a target nerve, the nerve is prevented from being damaged by the sharp needle head.

According to the invention, the liquid inlet pipe is not influenced by the rotation of the rotating rod, and the work of the liquid inlet pipe and the rotating rod cannot interfere with each other, so that when large injection normal saline or anesthetic is required to be injected, the tail end of the liquid inlet pipe is conveniently connected with an injector so as to directly inject local anesthetic or normal saline, or is connected with a clinical continuous administration system so as to continuously administer drugs.

In the invention, in order to facilitate the observation of the depth of the catheter needle, centimeter scales are engraved on the puncture catheter. Before operation, the sharp end of the puncture needle head is confirmed to extend out of the puncture catheter and be positioned outside the elastic body, and the grasping handle is adjusted to the proper position of the catheter needle to facilitate grasping operation. The puncture is performed under ultrasound guidance, approaching the target nerve. In the puncture process, physiological saline can be injected through the liquid inlet pipe communicated with the puncture catheter, so that liquid flows out from the tip of the puncture needle to cause the change of tissues around the needle tip under an ultrasonic image, and the position of the tip of the puncture needle is convenient to determine (Hydrolocation technology, namely water positioning technology). When the tip of the puncture needle head penetrates through soft tissue and begins to approach a target nerve, the rotating handle is rotated to drive the push block of the rotating rod to push the elastic body outwards through the push rod, so that the corrugated tube body is driven outwards, the purpose of enclosing the puncture needle head is achieved, the tip of the puncture needle head can be adjusted to be pushed back into the puncture catheter, puncture sharpness is lost, and due to the existence of the push rod, puncture toughness can be kept to puncture the nerve. Therefore, when the tip of the puncture needle touches a target nerve to move or a patient complains of a nerve touch abnormal feeling under the ultrasonic observation, the tip of the puncture needle (and the head end of the puncture catheter) can not penetrate into the nerve sheath membrane to damage the nerve due to the buffering effect of the elastic body. When the puncture needle assembly needs to be punctured again, the catheter needle assembly can be withdrawn to the safety position, the rotating handle is rotated reversely again, so that the push rod is driven by the push block to return to the tail end of the tube body, under the condition that the support of the push rod is lost, the sharp end of the puncture needle head can extend out of the elastic body again to restore the sharpness of the puncture catheter needle to readjust the direction during puncture, and the process is repeated again to approach the nerve when the nerve is approached. After confirming that the needle head end of the catheter is located at the satisfactory position beside the target nerve, the installation block can be detached, the rotating rod is directly pulled out, the push block and the push rod can be taken out, the puncture catheter becomes a soft catheter after the push rod is lost and can not damage tissues, the head end is kept nearby the target nerve, local anesthetic can be directly injected to the periphery of the target nerve through the standard injection interface or the connected standard injection interface at the tail end of the puncture catheter, and the pain feeling of the innervation area is eliminated so as to meet the requirements of anesthesia and pain treatment in clinical operation.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention (initial state, with the puncture needle extended out of the puncture catheter);

FIG. 2 is a schematic view of the puncture needle retracted into the puncture catheter according to the present invention;

FIG. 3 is an enlarged view of A of FIG. 1 with the piercing needle extended;

FIG. 4 is a schematic view of the puncture catheter driving the elastic body to further approach the puncture-dense schwann membrane according to the present invention;

FIG. 5 is a schematic cross-sectional view of a piercing catheter according to the present invention.

In the figure: the puncture needle comprises a puncture catheter 1, a pinch handle 2, a puncture needle head 3, a puncture needle hole 30, a structure 4, a tube body 40, an elastic body 41, a hole 42, a leak hole 43, a rotating rod 5, a cavity 50, a rotating handle 51, a pushing block 6, an installation block 7, a bearing 8, a pushing rod 9, a tube cavity 10, a liquid inlet tube 11, a grasping handle 12, a bolt 13, a sucker 14 and a plug hole 15.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example (b):

referring to fig. 1 to 5, the present invention provides a technical solution:

the utility model provides a puncture catheter needle subassembly suitable for continuous nerve block, includes puncture catheter 1, holds between the fingers handle 2, puncture needle 3 and does not have the actuating mechanism of translation, the tail end of puncture catheter 1 is fixed with the head end installation of holding between the fingers handle 2, puncture needle 3 installs in puncture catheter 1's lumen 10, and is close to in puncture catheter 1's head end department, puncture needle 3's length is far less than puncture catheter 1's length, puncture catheter 1's head end has and is used for protecting puncture needle 3 and is used for the buffering and prevents puncture catheter 1 further to be forced the structure 4 of stinging to fine and close nerve sheath membrane, the actuating mechanism of no translation includes bull stick 5 for the drive relative displacement takes place between structure 4 and puncture needle 3, makes this puncture needle 3 accomodate in the structure 4. In the present invention, the head end is defined based on the external operation end as the tail end.

Specifically, the structure 4 includes a foldable tube 40 and an elastic body 41, the tube 40 is integrated with the puncture catheter 1, and the elastic body 41 is fixed to a tip end of the tube 40. The tube body 40 is corrugated and provided with a leak hole 43, in an initial state, the tube body 40 is a corrugated tube which can be conveniently stretched, when the puncture needle punctures to approach a target, the puncture needle head 3 retracts into the puncture catheter 1, the corrugated tube can enclose the puncture needle head 3, when the puncture needle approaches the target nerve, the top of the tube body 40 is flush with the outer wall of the puncture catheter 1, and the bottom of the tube body is flush with the inner wall of the puncture catheter 1 or is spaced, so that as shown in figure 3, when the elastic body 41 is pushed out by the push rod 9, the push rod 9 can be conveniently pushed, thereby the push resistance is reduced, the elastic body 41 is hemispherical or trumpet-shaped, if the elastic body is made of medical silica gel, rubber or high polymer material, the elastic body has certain elasticity, when the puncture needle head 3 retracts into the puncture catheter 1, the puncture needle head 3 partially loses sharpness, when the nerve is touched, the nerve cannot be damaged, but the push rod 9 is still in the puncture catheter 1, and the whole catheter needle assembly still has the capability of penetrating through soft tissues such as myofascium and the like and continues to approach until the target nerve is safely touched. And can further compel when target nerve through the purpose that sets up elastomer 41 at the pipe needle subassembly, can play the buffering, and then play and avoid pricking the probably of tight nerve sheath membrane damage nerve, also accomplished when puncture pipe 1 further pierces and compels to near target nerve, the painful sense that the reduction puncture brought that can be very big.

In the present invention, as shown in fig. 4, when the puncture catheter 1 is driven to further force the puncture catheter 1 to puncture the target nerve, the elastic body 41 provided at the tip of the puncture catheter 1 deforms due to resistance generated by the portion of the punctured tissue, and becomes a blunt tip with a larger diameter, similar to an umbrella shape or a T shape, so that the diameter of the elastic body 41 is larger than the diameter of the puncture catheter 1, and the puncture catheter 1 can achieve the purpose of "passive diameter change", and therefore, the tip of the puncture catheter 1 does not puncture the nerve sheath membrane and damage the nerve when further approaching the target nerve.

In the present invention, the elastic body 41 has a hole 42 for passing the puncture needle 3, so that the material of the whole catheter needle assembly can be reduced. In the prior art, since the liquid can flow out from a side hole (not shown in the figure) reserved at the head of the puncture catheter 1 by injecting the physiological saline during the puncture process, the tissue around the needle point is changed under the ultrasonic image, and the position of the tip of the puncture needle head 3 is convenient to determine (Hydrolocation technology, namely water positioning technology). The hole 42 is provided for increasing the amount of saline injected per unit time, and the hole 42 allows the saline to flow out to the puncture site more uniformly, thereby facilitating the positioning of the puncture needle 3.

In the present invention, the puncture needle 3 is installed in the lumen 10 of the puncture catheter 1 and is close to the head end of the puncture catheter 1, and since the length of the puncture needle 3 is much shorter than the length of the puncture catheter 1, for example, the puncture needle 3 is one tenth, one ninth, etc. of the puncture catheter 1. Can shorten better under the prerequisite that puncture syringe needle 3 can puncture, the purpose that sets up like this has, firstly, the material of puncture syringe needle 3 has been reduced, secondly, puncture catheter 1 intraductal do not have the pjncture needle body like puncture needle core among the prior art, the pjncture needle body among the prior art has been saved, make the puncture catheter 1 who adopts the same specification like this, can enlarge the rate of utilization of puncture catheter 1 internal diameter, can be convenient for inject normal saline and can pour into more in the same time, and the speed is faster, simultaneously because the existence of push rod 9, do not cause puncture catheter 1's deflection to descend because of having saved puncture needle body, can guarantee to install the same deflection of puncture needle body with puncture catheter 1.

Specifically, as shown in fig. 1-2, the non-translational driving mechanism further includes a push block 6, the rotating rod 5 has a cavity 50, the rotating rod 5 is inserted into the tail end of the pinching handle 2 and is rotationally matched with the pinching handle 2, the push block 6 is installed in the circular cavity 50, the two are in threaded connection, the push block 6 is provided with push rods 9, the push rods 9 are 2 groups, 3 groups, 4 groups and the like which are symmetrical, and the head end of the push rod 9 penetrates through the pinching handle 2 and the puncture catheter 1 in sequence and is used for pushing the elastic body 41. The cavity 50 and the push block 6 are both circular, the push rods 9 are symmetrically arranged, the handle 2 and the puncture catheter 1 are provided with insertion holes 15 which are communicated in the direction, and the push rods 9 are inserted into the insertion holes 15. The rotating rod 5 is sleeved with an installation block 7 with a bearing 8, the rotating rod 5 is plugged or screwed on the handle knob 2 through the installation block 7, and the tail end of the rotating rod 5 leaks outwards and is provided with a rotating handle 51. In the invention, as shown in fig. 5, the rotating rod 5 can rotate on the handle 2, and the installation block 7 can ensure that the rotating rod 5 cannot fall off from the handle 2 under the condition that the installation block 7 is not detached, and the rotating rod 5 can be rotated to drive the push block 6 to perform reciprocating translation back and forth in the cavity 50, so that the puncture needle 3 can be enclosed by the tube body 40 through the push rod 9. In the present invention, since the rotation of the rotation lever 5 does not cause the forward and backward translation between the rotation lever 5 and the knob 2, the catheter needle assembly can be conveniently operated in the whole space.

Specifically, the puncture needle further comprises a liquid inlet pipe 11, and the head end of the liquid inlet pipe 11 sequentially penetrates through the rotating rod 5, the pushing block 6 and a channel reserved in the knob handle 2 to be communicated with the tube cavity 10 of the puncture catheter 1. As shown in fig. 1 or 2, in the present invention, the rotation of the rotating rod 5 does not cause the rotation of the liquid inlet tube 11, and since the liquid inlet tube 11 is not affected by the rotation of the rotating rod 5, the two operations will not interfere with each other, so when the injection of large injection of normal saline or anesthetic is required, the tail end of the liquid inlet tube 11 is conveniently connected to an injector for directly injecting local anesthetic or normal saline, or connected to a clinical continuous administration system for continuous administration.

Specifically, the puncture catheter 1 is provided with a gripping handle 12 with a lock catch, and a suction cup 14 is arranged on one surface of the gripping handle 12 close to the head end of the puncture catheter 1 through a bolt 13. The grasping handle can move along the wall of the puncture catheter, but can be fixedly locked during operation, an operator can grasp the grasping handle by hand to puncture the catheter needle conveniently, the catheter can be fixed on the surface of the skin conveniently by locking the position of the catheter at a proper position when the operation is finished, and the sucking disc 14 is arranged, so that the catheter is fixed and the surface of the skin is tighter, and shaking, shifting and the like can be avoided.

The catheter needle assembly of the present invention is used as follows:

in order to facilitate the observation of the depth of the entry of the catheter needle, a centimeter scale is marked on the puncture catheter 1. Before the operation, it is confirmed that the tip of the puncture needle 3 is protruded out of the puncture catheter 1 and is located outside the elastic body 41, and the grip handle 12 is adjusted to a proper position of the catheter needle to facilitate the grip operation. The puncture is performed under ultrasound guidance, approaching the target nerve. In the puncture process, physiological saline can be injected through the liquid inlet pipe 11 communicated with the puncture catheter 1, so that liquid flows out from the tip of the puncture needle head 3 to cause the change of tissues around the needle point under an ultrasonic image, and the position of the tip of the puncture needle head 3 is convenient to determine (Hydrolocation technology, namely water positioning technology). When the tip of the puncture needle head 3 passes through soft tissue and begins to approach a target nerve, the push block 6 of the rotating rod 5 is driven by rotating the rotating handle 51 to push the elastic body 41 outwards through the push rod 9, so that the corrugated tube body 40 is driven outwards, the purpose of enclosing the puncture needle head 3 is achieved, the tip of the puncture needle head 3 can be adjusted to be pushed back into the puncture catheter 1, the puncture sharpness is lost, and the puncture toughness can be kept to continuously puncture the nerve due to the existence of the push rod 9. Thus, when the movement of the target nerve is observed by the tip of the puncture needle 3 under ultrasound or the patient complains of the abnormal feeling of nerve touch, the tip of the puncture needle 3 (and the tip of the puncture catheter 1) will not penetrate into the nerve sheath to damage the nerve due to the buffering effect of the elastic body 41. After the catheter needle assembly is withdrawn to the safe position when re-puncture is required, the handle 51 is rotated in the reverse direction again, so that the push block 6 brings the push rod 9 back to the rear end of the tube 40, and under the condition of losing the support of the push rod 9, the sharp point of the puncture needle head 3 can extend out of the elastic body 41 again to restore the sharpness of the puncture catheter needle to re-adjust the direction when puncture is carried out, and the process is repeated again to approach the nerve when the nerve is approached. After confirming that the needle head end of the catheter is located at the satisfactory position beside the target nerve, the mounting block 7 can be detached, the rotating rod 5 is directly pulled out, so that the pushing block 6 and the pushing rod 9 can be taken out, the puncture catheter 1 becomes a soft catheter without damaging tissues after the pushing rod 9 is lost, the head end is kept nearby the target nerve, local anesthetic can be directly injected to the periphery of the target nerve through the standard injection interface or the connected standard injection interface at the tail end of the puncture catheter 1, and the pain feeling of the innervation area is eliminated so as to meet the requirements of anesthesia and pain treatment in clinical operations.

The invention, the remaining parts not described are the same as, or known or realizable by the prior art, and will not be described in detail here.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a puncture catheter needle subassembly suitable for continuous nerve block, includes puncture catheter (1), holds in the palm handle (2), puncture needle head (3) and does not have the actuating mechanism of translation, the tail end of puncture catheter (1) is fixed with the head end installation of holding in the palm handle (2), its characterized in that: the utility model discloses a puncture catheter, including puncture catheter (1), puncture catheter's head end department, the tip of puncture catheter (3) is installed in lumen (10) of puncture catheter (1), and be close to the head end department at puncture catheter (1), the length of puncture needle (3) is far less than the length of puncture catheter (1), the head end of puncture catheter (1) has and is used for protecting puncture needle (3) and is used for buffering and prevent puncture catheter (1) further to be forced to stab to the structure (4) of compact nerve sheath membrane, the actuating mechanism of no translation includes bull stick (5), is used for the drive relative displacement takes place between structure (4) and puncture needle (3), makes this puncture needle (3) accomodate in structure (4).

2. The catheter needle assembly of claim 1, wherein said catheter needle assembly is adapted for continuous nerve block, said catheter needle assembly comprising: the structure (4) comprises a foldable pipe body (40) and an elastic body (41), the pipe body (40) and the puncture catheter (1) are integrated, and the elastic body (41) is fixed with the head end of the pipe body (40).

3. The catheter needle assembly of claim 2 wherein said catheter needle assembly is adapted for continuous nerve block, wherein said catheter needle assembly further comprises: the tube body (40) is corrugated and is provided with a leak hole (43), the top of the tube body is flush with the outer wall of the puncture catheter (1) in an initial state, the bottom of the tube body is flush with the inner wall of the puncture catheter (1) or a space is reserved between the bottom of the tube body and the inner wall of the puncture catheter (1), and the elastic body (41) is hemispherical or trumpet-shaped.

4. The catheter needle assembly of claim 2 or 3, wherein: the driving mechanism without translation further comprises a pushing block (6), the rotating rod (5) is provided with a cavity (50), the rotating rod (5) is inserted at the tail end of the handle (2) and is in running fit with the handle (2), the pushing block (6) is installed in the circular cavity (50), the rotating rod and the handle are in threaded connection, a push rod (9) is installed on the pushing block (6), the head end of the push rod (9) penetrates through the handle (2) and the puncture catheter (1) in sequence and then is used for pushing the elastomer (41), and a hole (42) for the puncture needle head (3) to pass through is formed in the elastomer (41).

5. The catheter needle assembly of claim 4, wherein said catheter needle assembly further comprises: the cavity (50) and the push block (6) are both circular, the push rods (9) are symmetrically arranged, the handle (2) and the puncture catheter (1) are provided with insertion holes (15) which are communicated in the direction, and the push rods (9) are inserted into the insertion holes (15).

6. The catheter needle assembly of claim 4, wherein said catheter needle assembly further comprises: the rotary rod (5) is sleeved with an installation block (7) with a bearing (8), the rotary rod (5) is plugged or screwed on the knob handle (2) through the installation block (7), and the tail end of the rotary rod (5) leaks outwards and is provided with a rotary handle (51).

7. The catheter needle assembly of claim 6, wherein said catheter needle assembly further comprises: the puncture catheter also comprises a liquid inlet pipe (11), wherein the head end of the liquid inlet pipe (11) sequentially penetrates through a channel reserved in the rotating rod (5), the pushing block (6) and the pinching handle (2) and is communicated with the lumen (10) of the puncture catheter (1).

8. The catheter needle assembly of claim 1, wherein said catheter needle assembly is adapted for continuous nerve block, said catheter needle assembly comprising: the puncture catheter is characterized in that the puncture catheter (1) is provided with a grabbing handle (12) with a lock catch, and a sucker (14) is installed on one surface, close to the head end of the puncture catheter (1), of the grabbing handle (12) through a bolt (13).