CN210114480U

CN210114480U - Children lumbar puncture needle

Info

Publication number: CN210114480U
Application number: CN201920389312.4U
Authority: CN
Inventors: 潘瑞英; 王慧
Original assignee: 924th Hospital of the Joint Logistics Support Force of PLA
Current assignee: 924th Hospital of the Joint Logistics Support Force of PLA
Priority date: 2019-03-26
Filing date: 2019-03-26
Publication date: 2020-02-28
Anticipated expiration: 2029-03-26

Abstract

The utility model relates to the technical field of medical equipment, in particular to a children lumbar puncture needle, which comprises a needle handle, a needle sleeve, a needle tube, a needle pushing device and a pressure measuring device, wherein both ends of the needle handle are provided with openings, an accommodating cavity is arranged inside the needle handle, one end of the needle sleeve is communicated with the opening of the needle handle, and one end of the needle tube penetrates into the needle sleeve from the accommodating cavity; the needle pushing device comprises a connecting piece, a pushing rod and an extension spring, the connecting piece is arranged in the containing cavity, and one surface of the connecting piece is fixedly connected with one end of the needle tube through a liquid discharge ring; the push rod is arranged in the containing cavity and is in threaded connection with the opening of the needle handle; two ends of the extension spring sleeve are respectively and fixedly connected with the connecting piece and the containing cavity; the pressure measuring device is used for measuring the pressure in the cavity. The utility model can effectively control the puncture speed and control the flow of cerebrospinal fluid, so as to ensure the normal intracranial pressure in the brain when the needle core is pulled out.

Description

Children lumbar puncture needle

Technical Field

The utility model belongs to the technical field of medical instrument technique and specifically relates to a children lumbar puncture needle.

Background

Conventionally, in lumbar puncture, children and adults use the same lumbar puncture needle. Because the matching degree of children is poor, when the traditional lumbar puncture needle is used, the problems that the lumbar puncture needle is too long, the needle core is easy to slip, the puncture operation steps are complicated, and the visual display cannot be realized even after the puncture is in place, and the like easily occur, so that the lumbar puncture is frequently failed, much trouble is brought to the normal diagnosis and treatment of doctors, and the pain is also increased for the sick children. Moreover, the lumbar drainage pjncture needle that generally uses at present, simple structure can not carry out accurate control to the flow of cerebrospinal fluid, has the problem that can not control the cerebrospinal fluid flow, and the doctor can not whole journey know the intracranial pressure condition when using ordinary lumbar drainage pjncture needle, because of too fast or excessive formation that causes the cerebral hernia easily when drainage cerebrospinal fluid, has brought very big threat for patient's life. When a doctor uses the common lumbar puncture needle and needs to inject medicine in a sheath, the puncture needle is not easy to fix and inconvenient to administer medicine, even the lumbar puncture is needed to be repeated, and the pain is caused to the sick children.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides a children lumbar puncture needle, which can effectively control the puncture speed and control the flow of cerebrospinal fluid so as to ensure the normal intracranial pressure when the needle core is pulled out.

In order to realize the purpose, the utility model discloses a technical scheme be:

a children lumbar puncture needle comprises a needle handle, a needle sleeve, a needle tube, a needle pushing device and a pressure measuring device, wherein openings are formed in two ends of the needle handle, a containing cavity is formed in the needle handle, the needle sleeve is of a hollow structure with openings in two ends, one end of the needle sleeve is fixedly connected with the needle handle and is communicated with the openings of the needle handle, a first needle head is arranged at the other end of the needle sleeve, the needle tube is of a hollow structure, a second needle head is arranged at one end of the needle sleeve, and one end of the needle tube, which is provided with the second needle head, penetrates into the needle sleeve from the containing cavity and;

the needle pushing device comprises a connecting piece, a pushing rod and an extension spring, the connecting piece is arranged in the containing cavity and is in sliding connection with the needle handle, one surface of the connecting piece is fixedly connected with one end, far away from the second needle head, of the needle tube through a liquid drainage ring, and a plurality of liquid drainage holes communicated with the inside of the liquid drainage ring are formed in the periphery of the liquid drainage ring in a penetrating mode; one end of the push rod is inserted into the containing cavity and is positioned on one surface of the connecting piece, which is far away from the needle tube, the push rod is provided with threads, the push rod is in threaded connection with an opening of the needle handle, which is far away from the second needle head, and the push rod can push the connecting piece by rotating the push rod; the extension spring is sleeved outside the push rod, and two ends of the extension spring are respectively and fixedly connected with the connecting piece and the accommodating cavity; a screwing handle is arranged at one end of the push rod, which is far away from the connecting piece;

a through placing hole is formed in the circle center of the connecting piece, and the liquid discharge ring is in conduction connection with the placing hole; a switch rod is arranged in the push rod, is connected with the push rod in a sliding mode and can penetrate out of the twisting handle, a sealing rubber plug is arranged at one end of the switch rod, and can penetrate into the liquid discharge ring through the placing hole, so that the liquid discharge hole is blocked by the sealing rubber plug;

the pressure measuring device comprises a pressure gauge, the pressure gauge is in conduction connection with the side wall of one end, close to the needle sleeve, of the needle handle through a connecting pipe, the pressure gauge is provided with a pressure measuring probe, and the pressure measuring probe is used for measuring the pressure in the accommodating cavity and displaying real-time pressure through the pressure gauge.

Furthermore, the needle cover is made of transparent materials, and the needle tube is provided with scale marks.

Furthermore, the needle tube sleeve is provided with a telescopic tube sleeve, the telescopic tube sleeve is located in the containing cavity, one end of the telescopic tube sleeve is hermetically connected with one end, close to the liquid discharge hole, of the needle tube, and the other end of the telescopic tube sleeve is hermetically connected with an opening, close to the needle sleeve, of the containing cavity.

Furthermore, the twisting handle is provided with a limiting groove, one end of the switch rod, which is far away from the sealing rubber plug, is provided with a clamping piece which is matched with the limiting groove, and when the clamping piece is embedded into the limiting groove, the sealing rubber plug completely blocks the liquid discharge hole.

Further, the outer wall of connecting piece is equipped with two sliding blocks at least, hold the chamber be equipped with the sliding tray that the sliding block agrees with, the sliding block with sliding tray sliding connection.

Further, still include the three-way valve, three-way valve one end with the needle handle is close to the lateral wall turn-on connection of the one end of needle cover, both ends are equipped with receiving flask and intrathecal injection dosing pipe respectively in addition, the receiving flask pass through the ooff valve with three-way valve turn-on connection, intrathecal injection dosing pipe with three-way valve turn-on connection.

Furthermore, the outer wall of the twisting handle is provided with anti-skidding insections.

The utility model has the advantages that,

1. one side and needle tubing fixed connection of connecting piece, the pushing ram is located and is held the intracavity and lie in the connecting piece and keep away from the one side of needle tubing, the pushing ram is equipped with the screw thread, the opening threaded connection of second syringe needle is kept away from to the pushing ram and needle handle, extension spring cover is established outside the pushing ram, and both ends respectively with connecting piece and appearance chamber fixed connection, under extension spring's effect, the connecting piece can press to the pushing ram, twist through the corotation and move the pushing ram, make the pushing ram overcome extension spring's elasticity and promote the connecting piece simultaneously, make the needle tubing puncture in infant's lumbar vertebrae, adopt the indirect needle tubing that promotes of screw thread propulsive mode, can avoid the puncture speed too fast, and cause the misery for the.

2. Under the effect of switch lever, after the needle tubing puncture target in place, with the switch lever pulling towards the direction of keeping away from the needle tubing, can open the outage with sealed plug, make the cerebrospinal fluid of infant cerebrospinal fluid can discharge to holding the intracavity from the outage, at the exhaust in-process of cerebrospinal fluid, can learn the pressure that holds the chamber through the pressure of observing the manometer to the intracranial pressure of infant is indirectly mastered, and controls cerebrospinal fluid flow through the position control sealed plug at the fluid-discharge ring, guarantees that the intracranial pressure of infant is in suitable pressure.

3. The required liquid medicine is injected into the containing cavity from the intrathecal injection medicine feeding pipe through the injector, and the liquid medicine in the containing cavity can enter the needle tube from the liquid discharge hole under the pressure of the injector, so that intrathecal administration operation is carried out on the sick children.

Drawings

Fig. 1 is a schematic structural view of a children lumbar puncture needle according to a preferred embodiment of the present invention.

Fig. 2 is a schematic structural view of the switch lever of the children lumbar puncture needle according to a preferred embodiment of the present invention.

In the figure, 1-needle handle, 11-cavity, 2-needle sleeve, 21-first needle, 3-needle tube, 31-second needle, 32-graduation line, 33-telescopic tube sleeve, 4-connecting piece, 401-placing hole, 41-pushing rod, 42-extension spring, 43-twisting handle, 431-limiting groove, 432-anti-skid insection, 5-liquid discharge ring, 51-liquid discharge hole, 6-pressure gauge, 601-pressure measuring probe, 61-connecting tube, 7-switch rod, 71-sealing rubber plug, 72-clamping piece, 8-sliding block, 81-sliding groove, 9-three-way valve, 91-collecting bottle, 911-switch valve and 92-intrathecal injection medicine feeding tube.

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.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 and 2, a lumbar puncture needle for children according to a preferred embodiment of the present invention includes a needle handle 1, a needle sheath 2, a needle tube 3, a needle pushing device, a pressure measuring device and a collecting device.

Both ends of the needle handle 1 are provided with openings and the inside of the needle handle is provided with a containing cavity 11 communicated with the openings. The needle sleeve 2 is a hollow structure with two open ends, one end of the needle sleeve 2 is fixedly connected with the needle handle 1 and is communicated with the opening of the needle handle 1, and the other end is provided with a first needle 21. The needle tube 3 is a hollow structure and has one end provided with a second needle 31, and the end of the needle tube 3 provided with the second needle 31 penetrates into the needle sheath 2 from the cavity 11 and is connected with the needle sheath 2 in a sliding manner. The first needle 21 of the needle sheath 2 and the second needle 31 of the needle tube 3 are both used for puncturing the lumbar vertebrae of the infant patient.

In this embodiment, the needle sheath 2 is made of transparent material, and the needle tube 3 is provided with scale marks 32. In the process of puncturing the infant, the needle sleeve 2 is made of transparent materials, so that medical personnel can observe the scale marks 32, and the puncturing depth of the needle tube 3 can be conveniently known.

The push pin device comprises a connecting piece 4, a push rod 41 and an extension spring 42.

The connecting piece 4 is a circular structure matched with the inner wall of the accommodating cavity 11, the connecting piece 4 is arranged in the accommodating cavity 11 and is in sliding connection with the needle handle 1, one surface of the connecting piece 4 is fixedly connected with one end, far away from the second needle head 31, of the needle tube 3 through a liquid discharge ring 5, and a plurality of liquid discharge holes 51 communicated with the inside of the liquid discharge ring 5 are arranged on the periphery of the liquid discharge ring 5 in a penetrating manner. One end of the push rod 41 is inserted into the accommodating cavity 11 and is positioned on one surface of the connecting piece 4 far away from the needle tube 3, the push rod 41 is provided with threads, the push rod 41 is in threaded connection with an opening of the needle handle 1 far away from the second needle head 31, and the push rod 41 can push the connecting piece 4 by rotating the push rod 41; the extension spring 42 is sleeved outside the push rod 41, and two ends of the extension spring are respectively and fixedly connected with the connecting piece 4 and the accommodating cavity 11. The end of the push rod 41 remote from the attachment 4 is provided with a screw 43.

Under extension spring 42's effect, connecting piece 4 can press to push rod 41, twist through the corotation and move push rod 41, push rod 41 rotates for needle handle 1, makes push rod 41 overcome extension spring 42's elasticity and promote connecting piece 4 simultaneously, promotes needle tubing 3 through connecting piece 4 for needle tubing 3 can puncture in infant's lumbar vertebrae, adopts screw thread propulsion's mode to indirectly promote needle tubing 3, can avoid puncture speed too fast, and causes the misery for the infant.

In this embodiment, the outer wall of the connecting member 4 is provided with at least two sliding blocks 8, the accommodating cavity 11 is provided with a sliding groove 81 engaged with the sliding block 8, and the sliding block 8 is slidably connected with the sliding groove 81. Under the action of the sliding block 8 and the sliding groove 81, the pushing rod 41 can be prevented from driving the connecting piece 4 to rotate when rotating, so that the needle tube 3 can be prevented from rotating along with the rotating, and the pain of puncture of the child patient caused by the rotation of the needle tube 3 can be avoided. Preferably, the peripheral wall of the connecting piece 4 is provided with a sealant to ensure the sealing property between the connecting piece 4 and the inner wall of the accommodating cavity 1.

A through placing hole 401 is formed in the circle center of the connecting piece 4, and the liquid discharge ring 5 is in conduction connection with the placing hole 401; be equipped with switch lever 7 in the push rod 41, switch lever 7 and push rod 41 sliding connection to can wear out to twist 43, switch lever 7 one end is equipped with sealed plug 71, and can penetrate to leakage liquid ring 5 by placing hole 401, so that drainage hole 51 is blockked up by sealed plug 71.

Under the action of the switch rod 7, after the needle tube 3 is punctured in place, the switch rod 7 is pulled towards the direction far away from the needle tube 3, the sealing rubber plug 71 can be used for opening the liquid discharge hole 51, and therefore cerebral marrow liquid of cerebrospinal fluid of an infant patient can be discharged into the accommodating cavity 1 from the liquid discharge hole 71. The distance that stretches into the flowing back ring 5 through adjustment sealing rubber stopper 71 can control the cerebrospinal fluid and get into the flow that holds the intracavity 1, has solved the problem that ordinary lumbar vertebrae drainage pjncture needle can not control the cerebrospinal fluid flow, has avoided the doctor to use ordinary lumbar vertebrae drainage pjncture needle when extracting the nook closing member, leads to the intracranial pressure of patient to rise easily and causes the situation that the cerebral hernia formed to guaranteed patient's life safety, is fit for using widely.

The screwing handle 43 is provided with a limiting groove 431, one end of the switch rod 7, which is far away from the sealing rubber plug 71, is provided with a clamping piece 72 which is matched with the limiting groove 431, and when the clamping piece 72 is embedded into the limiting groove 431, the sealing rubber plug 71 completely blocks the liquid discharge hole 51. The switch lever 7 is prevented from completely entering the push lever 41 and being taken out by the stopper groove 431 and the hook 72.

Preferably, the end of the clip member 72 away from the sealing rubber plug 71 is provided with a pull ring 73, so that the position of the sealing rubber plug 71 on the liquid discharge ring 5 can be conveniently adjusted by the pull ring 73.

In this embodiment, the outer wall of the screwing handle 43 is provided with anti-slip insections 432, and the screwing handle 43 can be rotated by medical staff conveniently through the arranged anti-slip insections 432 so as to rotate the push rod 41.

In this embodiment, the needle tube 3 is sleeved with the telescopic tube sleeve 33, the telescopic tube sleeve 33 is located in the accommodating cavity 11, one end of the telescopic tube sleeve 33 is hermetically connected with one end of the needle tube 3 located in the accommodating cavity 11, and the other end of the telescopic tube sleeve 33 is hermetically connected with an opening of the accommodating cavity 11 close to the needle sleeve 2. The telescopic tube sleeve 33 is located between the drainage hole 51 and the needle hub 2. Under the action of the telescopic pipe sleeve 33, the connection part between the needle tube 3 and the opening of the cavity 11 can be sealed, so that cerebrospinal fluid in the cavity 11 is prevented from permeating between the needle sleeve 2 and the needle tube 3.

The pressure measuring device comprises a pressure gauge 6, the pressure gauge 6 is in conduction connection with the side wall of one end, close to the needle sleeve 2, of the needle handle 1 through a connecting pipe 61, the pressure gauge 6 is provided with a pressure measuring probe 601, and the pressure measuring probe 601 is used for measuring the pressure in the accommodating cavity 11 and displaying real-time pressure through the pressure gauge 6. In this embodiment, when puncturing the lumbar vertebra of the infant patient, the intracranial pressure in the brain of the infant patient can be obtained from the pressure in the chamber 11. The doctor can observe the intracranial pressure in the whole course by the pressure gauge 6, and the danger of cerebral hernia caused by too fast or excessive drainage cerebrospinal fluid is avoided. Ensure the life safety of the children patients and is suitable for popularization and application. The pressure gauge 6 and the pressure measuring probe 601 are disclosed in a visual lumbar puncture device with application number CN201520935026.5, and the detailed description thereof is omitted.

Children's lumbar puncture needle still includes three-

way valve

9, and 9 one end of three-way valve and needle handle 1 are close to the lateral wall turn-on connection of the one end of needle cover 2, and both ends are equipped with receiving flask 91 and intrathecal injection dosing pipe 92 respectively in addition, and receiving flask 91 passes through ooff valve 911 and three-way valve 9 turn-on connection, and intrathecal injection dosing pipe 92 and three-way valve 9 turn-on connection.

Under the action of the three-way valve 9, the medicine can be added to the patient or the cerebrospinal fluid can be drained. When needing intrathecal administration, inject required liquid medicine into holding the chamber 11 from intrathecal injection dosing tube 92 through the syringe, the quantity of opening of the drain hole 51 of simultaneous control to control the liquid feeding speed, under the pressure of syringe, the liquid medicine that holds the intracavity 11 can enter into the needle tubing 3 from the drain hole 51, and then adds the medicine operation to the infant.

When cerebrospinal fluid needs to be drained, the switching valve 911 is opened, so that the cerebrospinal fluid in the cavity 1 can be drained into the collecting bottle 9, and the switching value of the switching valve 911 is adjusted to control the amount of the cerebrospinal fluid entering the collecting bottle 91. The structure of the switch valve 911 is disclosed in the lumbar puncture needle with application number CN201520661012.9, and the detailed description thereof is omitted.

Use the utility model discloses a during pjncture needle, in retracting needle tubing 3 completely needle cover 2, utilize first syringe needle 21 to cover 2 puncture infant lumbar vertebrae one section position, then corotation is twisted and is moved and twist 43, the relative needle handle 1 of pushing ram 41 rotates, make pushing ram 41 overcome extension spring 42's elasticity and promote connecting piece 4 simultaneously for needle tubing 3 can puncture in infant's lumbar vertebrae, twist and twist 43 the time, push down fastener 72 with the hand, make to avoid fastener 72 to break away from leakage fluid ring 5. When the puncture reached suitable position, pull ring 73 was pulled up, made sealed plug 71 break away from outage 51, and cerebrospinal fluid flows into from outage 51 and holds the chamber 1 in, and medical personnel control switch valve 911's opening amount as required can make the cerebrospinal fluid that holds in the chamber 1 discharge the receiving flask 91 with suitable velocity of flow in, observes the reading of manometer 6 simultaneously, ensures that intracranial pressure is in the normal range value in the brain.

After collecting cerebrospinal fluid, the screwing handle 43 is screwed reversely, the pushing rod 41 rotates relative to the needle handle 1, the pushing rod 41 moves in the direction away from the needle sleeve 2, the connecting piece 4 is pulled and pressed towards the pushing rod 41 under the action of the extension spring 42, so that the needle tube 3 is gradually pulled out, the reading of the pressure gauge 6 is observed while the needle tube 3 is pulled out, the quantity of the sealed liquid discharge holes 51 of the sealed rubber plugs 71 is controlled through the push-pull switch rod 7, the discharge flow rate of the cerebrospinal fluid is controlled, and the intracranial pressure is guaranteed to be normal when the needle tube 3 is withdrawn. And finally, after the needle sleeve 2 is pulled out, the puncture point stops bleeding, and the operation of lumbar puncture is finished by applying sterile gauze and fixing the sterile gauze with adhesive tape.

When needing intrathecal administration, puncture the infant according to the above steps, inject required liquid medicine into the appearance chamber 11 from intrathecal injection dosing pipe 92 through the syringe, seal the quantity of outage 51 through control sealing plug 71 to control the liquid feeding speed, under the pressure of syringe, the liquid medicine in the appearance chamber 11 can enter into the needle tubing 3 from the outage 51, observe the reading of manometer 6 simultaneously, ensure that intracranial pressure is in normal range value in the brain, and then add the medicine operation to the infant.

Claims

1. The children lumbar puncture needle is characterized by comprising a needle handle (1), a needle sleeve (2), a needle tube (3), a needle pushing device and a pressure measuring device, wherein openings are formed in two ends of the needle handle (1), a containing cavity (11) is formed in the needle sleeve (2), the two ends of the needle sleeve (2) are open, the hollow structure is formed in the two ends of the needle sleeve (2), one end of the needle sleeve (2) is fixedly connected with the needle handle (1) and is communicated with the openings of the needle handle (1), a first needle head (21) is arranged at the other end of the needle sleeve, the needle tube (3) is hollow, a second needle head (31) is arranged at one end of the needle tube (3), and one end of the needle tube (3) provided with the second needle head (31) penetrates into the needle sleeve (2) from the;

the needle pushing device comprises a connecting piece (4), a pushing rod (41) and an extension spring (42), the connecting piece (4) is arranged in the containing cavity (11) and is in sliding connection with the needle handle (1), one surface of the connecting piece (4) is fixedly connected with one end, far away from the second needle head (31), of the needle tube (3) through a liquid drainage ring (5), and a plurality of liquid drainage holes (51) communicated with the inside of the liquid drainage ring (5) are formed in the periphery of the liquid drainage ring (5) in a penetrating mode; one end of the push rod (41) is inserted into the containing cavity (11) and is positioned on one surface, far away from the needle tube (3), of the connecting piece (4), the push rod (41) is provided with threads, the push rod (41) is in threaded connection with an opening, far away from the second needle head (31), of the needle handle (1), and the push rod (41) can push the connecting piece (4) by rotating the push rod (41); the extension spring (42) is sleeved outside the push rod (41), and two ends of the extension spring are respectively and fixedly connected with the connecting piece (4) and the accommodating cavity (11); a screwing handle (43) is arranged at one end of the push rod (41) far away from the connecting piece (4);

a through placing hole (401) is formed in the circle center of the connecting piece (4), and the liquid discharge ring (5) is in conduction connection with the placing hole (401); a switch rod (7) is arranged in the push rod (41), the switch rod (7) is connected with the push rod (41) in a sliding mode and can penetrate out of the twisting handle (43), a sealing rubber plug (71) is arranged at one end of the switch rod (7) and can penetrate into the liquid discharge ring (5) through the placing hole (401), and the liquid discharge hole (51) is blocked by the sealing rubber plug (71);

pressure measurement device includes manometer (6), manometer (6) through connecting pipe (61) with needle handle (1) is close to the lateral wall switch-on connection of the one end of needle cover (2), manometer (6) are equipped with pressure probe (601), pressure probe (601) are used for measuring the pressure that holds chamber (11) and pass through manometer (6) show real-time pressure.

2. A children's lumbar puncture needle according to claim 1, characterized in that: the needle sleeve (2) is made of transparent materials, and the needle tube (3) is provided with scale marks (32).

3. A children's lumbar puncture needle according to claim 1, characterized in that: the needle tube (3) is sleeved with a telescopic tube sleeve (33), the telescopic tube sleeve (33) is located in the accommodating cavity (11), one end of the telescopic tube sleeve (33) is in sealing connection with one end, close to the liquid discharge hole (51), of the needle tube (3), and the other end of the telescopic tube sleeve is in sealing connection with an opening, close to the needle sleeve (2), of the accommodating cavity (11).

4. A children's lumbar puncture needle according to claim 1, characterized in that: the screwing handle (43) is provided with a limiting groove (431), one end of the switch rod (7) far away from the sealing rubber plug (71) is provided with a clamping piece (72) matched with the limiting groove (431), and when the clamping piece (72) is embedded into the limiting groove (431), the sealing rubber plug (71) completely blocks the liquid discharge hole (51).

5. A children's lumbar puncture needle according to claim 1, characterized in that: the outer wall of connecting piece (4) is equipped with two sliding blocks (8) at least, hold chamber (11) be equipped with sliding tray (81) that sliding block (8) agree with, sliding block (8) with sliding tray (81) sliding connection.

6. A children's lumbar puncture needle according to claim 1, characterized in that: still include three-way valve (9), three-way valve (9) one end with needle handle (1) is close to the lateral wall turn-on connection of the one end of needle cover (2), both ends are equipped with receiving flask (91) and injection dosing pipe (92) in the sheath respectively in addition, receiving flask (91) through ooff valve (911) with three-way valve (9) turn-on connection, injection dosing pipe (92) in the sheath with three-way valve (9) turn-on connection.

7. A children's lumbar puncture needle according to claim 1, characterized in that: the outer wall of the twisting handle (43) is provided with anti-skidding insections (432).