CN212067372U

CN212067372U - Multi-needle skin continuous controllable negative pressure injection device capable of accurately controlling depth

Info

Publication number: CN212067372U
Application number: CN201922133953.6U
Authority: CN
Inventors: 刘韶锋
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-12-03
Filing date: 2019-12-03
Publication date: 2020-12-04
Anticipated expiration: 2029-12-03

Abstract

The utility model discloses a many needles skin of accurate control degree of depth lasts controllable negative pressure injection device, including screw thread auto-lock syringe, catch bar, injection gun handle, three-way valve and many needles negative pressure syringe needle, the front end at injection gun handle top is fixed and is equipped with the injection tube, the fixed catch bar in top of injection gun handle, and the catch bar goes deep into the injection tube, and the distal end of catch bar has circular iron sheet for promoting the syringe piston, has V type iron sheet recess on the circular iron sheet, is used for fixing syringe piston cap, the injection tube front end is through preforming fixed thread auto-lock syringe, the injection tube upper end is equipped with two fixation clamps, is used for fixing the syringe that has loaded reserve medicine; the utility model discloses avoid electronic injector to pass through mechanical transmission's way, can accurately carry out the injection volume and adjust to improve the validity of injection and the reliability of injection, labour saving and time saving, practical the device can reach the same effect of electronic injection.

Description

Multi-needle skin continuous controllable negative pressure injection device capable of accurately controlling depth

Technical Field

The utility model belongs to the field of medical equipment, especially, relate to many needles skin of accurate control degree of depth lasts controllable negative pressure injection device.

Background

At present, clinical dermatology and cosmetology relate to skin multi-range and multi-needle injection, and manual single-needle injection or existing electronic injection instruments are often used for injection; when in injection, the liquid medicine needed to be injected is often large in quantity, the injection depth is shallow, the times and the area for puncturing the skin are large, and the treatment liquid needs to be repeatedly filled into an injector or a plurality of injectors are used for replacement, for example, when in single-needle injection, the passivated needle needs to be repeatedly replaced by the needle; if manual single-needle injection is carried out, a doctor needs to accurately control the needle insertion depth, and if the needle insertion depth is too deep or too shallow, the treatment effect is influenced, and the pain feeling of single-needle treatment is obvious, so that the treatment needs to be operated by the doctor with extremely high technology, the repeated large amount of operation causes large labor amount, complicated flow, time and labor consumption, the electronic injector has high input cost, hundreds of thousands of even hundreds of thousands of times, the injector still needs to be automatically detached to add medicine in the injection process, the negative pressure adjustment is not flexible, the adjustment parameters are too many, the factors influencing the injection are too many, and medicine leakage and poor effect are finally caused; the invention can replace the electronic injection instrument to a certain extent, reduce the cost investment and realize flexible and exact treatment operation.

Accordingly, the prior art is deficient and needs improvement.

SUMMERY OF THE UTILITY MODEL

The utility model provides a many needles skin of accurate control degree of depth lasts controllable negative pressure injection device is through pulling the trigger, let the catch bar machinery advance, the exact ration of the distance of realization fixed quantity impels, selectivity function through the three-way valve, can realize that two liang of communicating or the three-dimensional of interface communicate with each other, the liquid medicine passes through the three-way valve, get into in the syringe of injection gun, realize the operation that non-dismounting device can directly add the medicine, the flow of operation has significantly reduced, thereby it receives bacterial contamination's possibility to reduce syringe and three-way valve, the medicine operation of adding has been reduced, the treatment time has been shortened, the above-mentioned problem that the efficiency solved is improved.

In order to solve the above problem, the utility model provides a technical scheme as follows:

a multi-needle skin continuous controllable negative pressure injection device with precise depth control comprises a thread self-locking injector, a push rod, an injection gun handle, a three-way valve, a multi-needle negative pressure needle head and a controllable negative pressure filter, it is characterized in that the front end of the top of the injection gun handle is fixedly provided with an injection tube, the top end of the injection gun handle is fixedly provided with a push rod, the push rod is provided with a unidirectional concentric shaft driving tooth, the push rod extends into the injection cylinder, the far end of the push rod is provided with a round iron sheet, used for pushing the injector piston, a V-shaped iron sheet groove is arranged on the round iron sheet and used for fixing the injector piston round cap, the front end of the injection tube is fixed with the thread self-locking injector through a pressing sheet, pushing a shifting block to push a pushing rod to push for a fixed distance through a trigger, pushing a syringe piston to move forward through the pushing rod, pressing liquid medicine into a three-way valve and a negative-pressure multi-needle head, wherein a needle head interface plugging cap of the three-way valve is fixedly connected with the left end of the three-way valve; the controllable negative pressure filter fixing clamp is fixedly arranged on the right wall of the injection gun handle, the controllable negative pressure filter fixing clamp can fix the detachable controllable negative pressure filter, and the controllable negative pressure filter is connected with the negative pressure multi-needle head negative pressure hole through a silicone tube.

Preferably, the middle part of the injection gun handle is provided with a through hole, a shifting block, a trigger and a push rod clamping piece; the trigger is rotationally connected with the injection gun handle, the shifting block is fixed at the top end of the trigger, and the push rod clamping piece is fixed at the right end of the top end of the injection gun handle.

Preferably, the push rod penetrates through a screw hole in the top end of a handle of the injection gun and is embedded into the injection tube, the push rod is provided with one-way concentric shaft driving teeth, the middle of the push rod is sleeved with a spring, the middle of the push rod is provided with a front shifting cylinder and a rear shifting cylinder, a space is reserved between the front shifting cylinder and the rear shifting cylinder, and the shifting block is clamped in the driving teeth on the push rod.

Preferably, the front end and the rear end of the top end of the injection tube are provided with spare liquid medicine injector fixing frames, and the injection support is used for fixing an injector filled with spare liquid medicine; the front end of the injection tube is provided with a through hole, the push rod is embedded into the through hole with the injection tube, and the round cap at the tail end of the piston of the push rod is in contact with the front end of the push rod clamped by the V-shaped iron sheet groove.

Preferably, the multi-needle negative pressure needle head comprises a needle head depth adjusting screw cap, a multi-needle positioning block, a circular auxiliary shell, a rotating shaft and a continuous negative pressure interface; the bottom mounting of cap is revolved in syringe needle degree of depth regulation is equipped with the rotation axis, the bottom of rotation axis is rotated and is connected many needles locating piece, cup joint circular auxiliary housing on the many needles locating piece, be equipped with the male thread on the rotation axis, in the many needles locating piece of rotation axis embedding, just female thread spiro union in the epaxial male thread of rotation and the many needles locating piece, the fixed a plurality of syringe needles that are equipped with in bottom of many needles locating piece, be equipped with a plurality of pinholes on the locating piece, the syringe needle on the pinhole on the locating piece is corresponding with the syringe needle on the many needles locating piece, just the bottom at circular auxiliary housing is fixed.

Preferably, the side surface of the positioning block is provided with a continuous negative pressure interface, and the continuous negative pressure interface is connected with a controllable negative pressure filter through a silica gel hose.

Preferably, the controllable negative pressure filter is cylindrical, the front end and the rear end of the controllable negative pressure filter are respectively provided with a silicone tube access port, and the side surface of the cylinder is provided with a hole for controlling negative pressure, and the negative pressure is adjusted through finger control; the middle section of the cylindrical filter is in threaded connection and can be screwed off in a rotating mode, the middle part of the inner side of the controllable negative pressure filter is provided with an annular spacer, and a medical yarn block or cotton wool is placed in an inner cavity at the front end of the controllable negative pressure filter and used for filtering liquid leaked outside during injection so as to prevent the liquid from entering central negative pressure to cause pollution; the front end interface is connected with the side hole of the negative pressure multi-needle head through a silica gel tube, and the rear end interface is connected with the negative pressure device through a silica gel hose.

Compared with the prior art, the utility model has the advantages that the above technical scheme is adopted, the utility model discloses a trigger is pulled, lets the catch bar machinery advance, realizes the definite quantitative propulsion of the distance of fixed quantity, through the selectivity function of three-way valve, can realize two liang of intercommunication or three-way intercommunication of interface, and the liquid medicine passes through the three-way valve, gets into the syringe of injection gun, realizes the operation that the device can directly add medicine without dismantling, has greatly reduced the flow of operation to reduce syringe and three-way valve and receive the possibility of bacterial contamination; the device has the advantages that the electronic injector can be prevented from being adjusted in injection amount accurately through a mechanical transmission method, the liquid medicine of the accurate amount can be accurately injected to the accurate depth of the skin through the negative-pressure multi-needle head with the adjustable depth, so that the effectiveness of injection and the reliability of injection are improved, time and labor are saved, the device can achieve the same effect of electronic injection, the medicine adding operation is reduced, the treatment time is shortened, and the efficiency is improved.

Drawings

For a clearer explanation of the embodiments or technical solutions in the prior art, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is an exploded view of the overall structure of the present invention;

FIG. 3 is a schematic structural diagram of a three-way valve according to the present invention;

FIG. 4 is a schematic view of the multi-needle negative pressure needle head of the present invention;

FIG. 5 is an enlarged view of the controllable negative pressure filter of the present invention;

as shown in the above legend: 1. an injection gun handle; 2. a push rod; 3. a threaded self-locking syringe; 4. a three-way valve; 5. a multi-needle negative pressure needle head; 6. an injection tube; 7. shifting blocks; 8. a spring; 9. a controllable negative pressure filter; 10. a filter holder; 11. a standby liquid medicine syringe fixing frame; 12. an injection cylinder observation window; 13. a first snap ring; 14. a second snap ring; 15. a screw cap; 41. the three-way valve is connected with the threaded injector; 42. a three-way valve threaded cap; 43. an internal thread rotary bayonet; 44. a three-way valve is provided with a liquid feeding port; 45. a rotary switch handle; 46. a three-way valve needle head interface plugging cap; 51. the needle head depth is adjusted and the cap is screwed; 52. a multi-needle positioning block; 53. a circular auxiliary housing; 54. positioning blocks; 55. a rotating shaft; 56. and (5) continuously performing negative pressure connection.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described in more detail with reference to the accompanying drawings and specific embodiments. The preferred embodiments of the present invention have been illustrated in the accompanying drawings, but may be embodied in many different forms and not limited to the embodiments described in the specification, but rather, these embodiments are provided so that this disclosure will be thorough and complete.

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 an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The use of the terms "fixed," "integrally formed," "left," "right," and the like in this specification is for illustrative purposes only, and elements having similar structures are designated by the same reference numerals in the figures.

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 shown in fig. 1-4, one embodiment of the present invention is:

a multi-needle skin continuous controllable negative pressure injection device with precise depth control comprises a thread self-locking injector 3, a push rod 2, an injection gun handle 1, a three-way valve 4, a multi-needle negative pressure needle head 5 and a controllable negative pressure filter 9, it is characterized in that the front end of the top of the injection gun handle 1 is fixedly provided with an injection tube 6, the top end of the injection gun handle 1 is fixedly provided with a push rod, the push rod is provided with a unidirectional concentric shaft driving tooth, the push rod 2 extends into the injection tube 6, the far end of the push rod is provided with a round iron sheet, used for pushing the injector piston, a V-shaped iron sheet groove is arranged on the round iron sheet and used for fixing the injector piston round cap, the front end of the injection tube 6 is fixed with the thread self-locking injector through a pressing sheet, through the trigger, promote shifting block 7 and impel the catch bar and carry out the fixed distance and impel, the catch bar promotes the syringe piston and gos forward, presses liquid medicine into three-way valve and many needles of negative pressure syringe needle. The left end of the three-way valve is fixedly connected with a three-way valve needle head connector plugging cap 46; the right wall of the injection gun handle 1 is fixedly provided with a controllable negative pressure filter 9 fixing clamp, the controllable negative pressure filter 9 fixing clamp can fix the detachable controllable negative pressure filter 9, and the controllable negative pressure filter 9 is connected with a negative pressure multi-needle head negative pressure hole through a silicone tube.

Preferably, the middle part of the injection gun handle 1 is provided with a through hole, a shifting block 7, a trigger and a push rod clamping piece; the trigger is rotationally connected with the injection gun handle, the shifting block 7 is fixed at the top end of the trigger, and the push rod clamping piece is fixed at the right end of the top end of the injection gun handle 1.

Preferably, the push rod penetrates through a screw hole in the top end of the injection gun handle 1 and is embedded into the injection tube 6, unidirectional concentric shaft driving teeth are arranged on the push rod, the spring 8 is sleeved in the middle of the push rod, a front shifting barrel and a rear shifting barrel are arranged in the middle of the push rod, a space is reserved between the front shifting barrel and the rear shifting barrel, and the shifting block 7 is clamped in the driving teeth on the push rod.

Further, the syringe comprises a syringe observation window 12, a first snap ring 13, a second snap ring 14 and a threaded pressure cap 15; both ends are equipped with the draw-in groove around the 12 inner walls of injection tube observation window, first snap ring 13 and second snap ring 14 joint respectively in the draw-in groove at both ends around the 12 inner walls of injection tube observation window, the inner wall of screw cap 15 is equipped with the internal thread, the outer wall of 12 front ends of injection tube observation window is equipped with the external screw thread, screw cap 15 and the front end spiro union of injection tube observation window 12.

Further, the internal thread rotary buckle is used for connecting a multi-needle negative pressure injection needle head.

Example 2

The threads on the push rod 2 can be replaced by threads of 1 ml, 2.5ml, 5ml, 10ml and 20 ml; through the injection of accurate injection rifle, can realize accurate medicine dosage injection, the constant injection, the injection volume inequality that has avoided manual injection, the inequality scheduling problem of exerting oneself.

Preferably, the front end and the rear end of the top end of the injection tube 6 are provided with spare liquid medicine injector fixing frames 11, and the injection support is used for fixing an injector filled with spare liquid medicine; the front end of injection tube 6 is equipped with the through-hole, in the through-hole of injection tube 6 is taken in the catch bar embedding, just 2 piston tail end domes of catch bar contact with the front end of the V type iron sheet recess chucking of catch bar.

Preferably, the multi-needle negative pressure needle 5 comprises a needle depth adjusting screw cap 51, a multi-needle positioning block 5452, a circular auxiliary housing 53, a rotary thread and a continuous negative pressure interface 56; the bottom end of the needle depth adjusting screw cap 51 is fixedly provided with a rotating shaft 55, the bottom end of the rotating shaft 55 is rotatably connected with a multi-needle positioning block 5452, the multi-needle positioning block 5452 is sleeved with a circular auxiliary shell 53, the rotating shaft 55 is provided with a male thread, the rotating shaft 55 is embedded into the multi-needle positioning block 5452, the male thread on the rotating shaft 55 is in threaded connection with the female thread in the multi-needle positioning block 5452, the bottom of the multi-needle positioning block 5452 is fixedly provided with a plurality of needles, the positioning block 54 is provided with a plurality of needle holes, the needle holes on the positioning block 54 correspond to the needle heads on the multi-needle positioning block 5452, and the positioning block 54 is fixed at the bottom.

Preferably, the side surface of the positioning block 54 is provided with a continuous negative pressure interface 56, the controllable negative pressure filter 9 is preferably connected by a silica gel hose, the controllable negative pressure filter 9 is cylindrical, the front end and the rear end of the controllable negative pressure filter are respectively provided with a silica gel tube access port, the side surface of the cylinder is provided with a hole for controlling negative pressure, and the negative pressure effect is adjusted by finger control; the middle section of the cylindrical filter is in threaded connection and can be screwed off in a rotating mode, the middle part of the inner side of the controllable negative pressure filter 9 is provided with an annular isolating sheet, and a medical yarn block or cotton wool is placed in an inner cavity at the front end of the controllable negative pressure filter 9 and used for filtering liquid leaked outside during injection, so that the liquid is prevented from entering central negative pressure to cause pollution; the front end interface is connected with the side hole of the negative pressure multi-needle head through a silica gel tube, and the rear end interface is connected with the negative pressure device through a silica gel hose.

Further, the injection gun handle 1 is provided with parallel grooves for increasing friction.

Further, the three-way valve 4 comprises a three-way valve threaded injector connecting end 41, a three-way valve threaded injector connecting end 42, an internal thread rotary bayonet 43, a three-way valve dosing port 44, a rotary switch handle 45 and a three-way valve needle port plugging cap 46; the rotary switch handle 45 is rotatably connected to the top end of the three-way valve threaded injector connecting end 41, the three-way valve threaded cap 42 and the internal thread rotary bayonet 43 are sequentially fixed to the front end and the rear end of the three-way valve threaded injector connecting end 41, external threads are uniformly arranged on the outer wall of the rear end of the internal thread rotary bayonet 43, one end of the three-way valve needle head connector plugging cap 46 is embedded into the internal thread rotary bayonet 43, the other end of the three-way valve needle head connector plugging cap is detachably connected with the output end of the injection gun 3, and the three-way valve liquid adding port 44 is.

Example 3

The multi-needle negative pressure needle head can adjust the extending length of the needle head through the manual rotation knob, can adjust the exposed length of five/nine steel needles simultaneously, realizes the accurate control of the skin breaking depth, and achieves the purpose of accurate treatment.

Such as A, screw in figure 5, the filter and the negative pressure control area can be unscrewed and separated; B. a side hole; C. the outlet is connected with a hose; d, an access port is connected with a hose.

The working principle is as follows:

when using many needles skin to last negative pressure injection device, the operator grips the injection rifle handle, through the trigger of pulling, through lever principle, makes the shifting block of fixing on handle top stir the driving gear on the catch bar for the catch bar moves forward, advances through the catch bar and comes the screw thread syringe piston to move forward, makes the liquid medicine in the screw thread syringe impress three-way valve and many needles negative pressure syringe needle forward, finally injects in patient's skin. The exposed degree of depth of steel needle is adjusted through the rotation of cap is adjusted soon in syringe needle degree of depth regulation, thereby adjust the syringe needle and get into the degree of depth of skin, simultaneously when adding medicine in needs, push rod card pushes down earlier, the push rod is drawn afterwards, let push rod and syringe piston retreat, the side opening of three-way valve screw thread syringe link is opened to the rotary switch handle of accessible three-way valve, close the syringe needle passageway, controllable negative pressure filter is from lasting negative pressure interface toward three-way valve in input liquid medicine, get into the syringe of injection rifle in, realize the operation that the device can directly add medicine not dismantling.

Compared with the prior art, the utility model has the advantages that the technical scheme is adopted, the utility model discloses a trigger is pulled, the screw injector machinery advances, realize the definite quantitative propulsion of the distance of fixed quantity, through the selectivity function of three-way valve, can realize two liang of intercommunication or three-way intercommunication of interface, the liquid medicine passes through the three-way valve, get into the syringe of injection gun, realize the operation that the undetachable device can directly add medicine, the flow of operation has greatly reduced, thereby reduce the syringe and the three-way valve and receive the possibility of bacterial contamination, the operation of adding medicine has been reduced, treatment time has been shortened, efficiency has been improved; the device can avoid the complicated function that the electronic injector needs to be detached after adding medicine again, and the liquid medicine can be easily filled under the condition of the detaching device. The waste of manually filling repeatedly or using a plurality of syringes to prepare liquid medicine is also avoided.

It should be noted that the above technical features are continuously combined with each other to form various embodiments which are not listed above, and all the embodiments are regarded as the scope of the present invention described in the specification; moreover, modifications and variations will occur to those skilled in the art in light of the foregoing description, and it is intended to cover all such modifications and variations as fall within the true spirit and scope of the invention as defined by the appended claims.

Claims

1. The multi-needle skin continuous controllable negative pressure injection device capable of accurately controlling the depth comprises a threaded self-locking injector, a push rod, an injection gun handle, a three-way valve, a multi-needle negative pressure needle head and a controllable negative pressure filter, and is characterized in that an injection tube is fixedly arranged at the front end of the top of the injection gun handle, the push rod is fixed at the top end of the injection gun handle, the push rod is provided with one-way concentric shaft driving teeth, the push rod extends into the injection tube, the far end of the push rod is provided with a circular iron sheet for pushing an injector piston, and a V-shaped iron sheet groove is formed in the circular iron sheet for fixing an injector piston round cap; the front end of the injection tube is fixed with a thread self-locking injector through a pressing sheet, a shifting block is pushed by a trigger to push a pushing rod to carry out fixed distance pushing, the pushing rod pushes a piston of the injector to move forwards, liquid medicine is pressed into a three-way valve and a negative pressure multi-needle head, and a needle head interface plugging cap of the three-way valve is fixedly connected with the left end of the three-way valve; the controllable negative pressure filter fixing clamp is fixedly arranged on the right wall of the injection gun handle, the controllable negative pressure filter fixing clamp can fix the detachable controllable negative pressure filter, and the controllable negative pressure filter is connected with the negative pressure multi-needle head negative pressure hole through a silicone tube.

2. The multi-needle skin continuously controllable negative pressure injection device with precise depth control according to claim 1, wherein the middle part of the handle of the injection gun is provided with a through hole, a shifting block, a trigger and a push rod clamping piece; the trigger is rotationally connected with the injection gun handle, the shifting block is fixed at the top end of the trigger, and the push rod clamping piece is fixed at the right end of the top end of the injection gun handle.

3. The multiple-needle skin-sustained controllable negative pressure injection device with precise depth control according to claim 2, wherein the push rod penetrates through a screw hole at the top end of the handle of the injection gun and is embedded into the injection tube, the push rod is provided with a driving tooth with a one-way concentric shaft, the middle part of the push rod is sleeved with a spring, the middle part of the push rod is provided with a front shifting cylinder and a rear shifting cylinder, a space is left between the front shifting cylinder and the rear shifting cylinder, and the shifting block is clamped in the driving tooth on the push rod.

4. The multi-needle skin continuously controllable negative pressure injection device with precise depth control according to claim 1, wherein the front and rear ends of the top end of the injection cylinder are provided with a standby liquid medicine injector fixing frame, and the injection support is used for fixing a full standby liquid medicine injector; the front end of the injection tube is provided with a through hole, the push rod is embedded into the through hole with the injection tube, and the round cap at the tail end of the piston of the push rod is in contact with the front end of the push rod clamped by the V-shaped iron sheet groove.

5. The skin continuous controllable negative pressure injection device with multiple needles and precise depth control according to claim 1, wherein the multiple needle negative pressure needle head comprises a needle head depth adjusting screw cap, a multiple needle positioning block, a circular auxiliary housing, a rotating shaft and a continuous negative pressure interface; the bottom mounting of cap is revolved in syringe needle degree of depth regulation is equipped with the rotation axis, the bottom of rotation axis is rotated and is connected many needles locating piece, cup joint circular auxiliary housing on the many needles locating piece, be equipped with the male thread on the rotation axis, in the many needles locating piece of rotation axis embedding, just female thread spiro union in the epaxial male thread of rotation and the many needles locating piece, the fixed a plurality of syringe needles that are equipped with in bottom of many needles locating piece, be equipped with a plurality of pinholes on the locating piece, the syringe needle on the pinhole on the locating piece is corresponding with the syringe needle on the many needles locating piece, just the bottom at circular auxiliary housing is fixed.

6. The multi-needle skin continuous controllable negative pressure injection device with the precise depth control according to claim 5, wherein a continuous negative pressure port is arranged on the side surface of the positioning block, and a controllable negative pressure filter is connected with a silicone hose.

7. The multi-needle skin continuous controllable negative pressure injection device with the precise depth control according to claim 1, wherein the controllable negative pressure filter is cylindrical, the front end and the rear end of the controllable negative pressure filter are respectively provided with a silicone tube access port, and the side surface of the cylinder is provided with a hole for controlling the negative pressure and adjusting the negative pressure effect through finger control; the middle section of the cylindrical filter is in threaded connection and can be screwed off in a rotating mode, the middle part of the inner side of the controllable negative pressure filter is provided with an annular spacer, and a medical yarn block or cotton wool is placed in an inner cavity at the front end of the controllable negative pressure filter and used for filtering liquid leaked outside during injection so as to prevent the liquid from entering central negative pressure to cause pollution; the front end interface is connected with the side hole of the negative pressure multi-needle head through a silica gel tube, and the rear end interface is connected with the negative pressure device through a silica gel hose.