CN116256456B - extraction needle - Google Patents

Abstract

The embodiment of the invention provides an extraction needle, and relates to the field of sampling mechanisms. Aims to solve the problem of inconvenient sample injection operation. The device comprises at least two needle bars, an extraction needle, a gas guide needle, a matching component, a driving mechanism, an air inlet pipe and an air outlet pipe; at least two needle bars are sequentially arranged in the direction from the inner side to the outer side and can slide; the extraction needle is fixed on the needle bar at the inner side, and the gas guide needle is fixed on the needle bar at the outer side; the driving mechanism is used for driving the needle bar at the inner side to sequentially pass through the matching component and lock with the needle bar at the outer side, or is used for driving the needle bar at the inner side to sequentially pass through the matching component and unlock with the needle bar at the outer side, so that the extraction needle and the gas guide needle are driven to move in stages, and the extraction needle passes through or retracts into the gas guide needle. The multi-stroke driving is realized by using one driving mechanism, the up-and-down movement of the gas guide needle and the movement of the extraction needle are combined into one driving mechanism, the multi-functional sample injection is realized, and the problem that the sample injection operation is inconvenient is solved.

Description

Extraction needle

Technical Field

The invention relates to the field of sampling mechanisms, in particular to an extraction needle.

Background

The traditional headspace sample injection is divided into an injector type, an injector adding quantitative replacement type, a pressure balance type and a dynamic compensation type according to a sample injection mode. The solid phase microextraction sample injection is a process of adsorbing components to be detected through a solid phase microextraction needle, wherein the needle head of the solid phase microextraction needle is provided with adsorption fibers with the length of about 20 mm or metal wires coated with adsorbents, the outside is provided with a metal guide pipe to play a role in puncture, the inside needle can move in the outside guide pipe, the extraction needle head is protected by the outside guide pipe at ordinary times, and the upper part is sealed by an elastic sealing material to be airtight.

The head space sample injection and the solid-phase microextraction sample injection are not separated from the needle for guiding gas, and the solid-phase microextraction needle is provided with one more extraction head (also called a needle core) than the head space sample injection needle, and the extraction head moves and drives in the outer needle. The two are operated separately, the structure is not simplified enough, and simultaneously, a lot of inconveniences are brought to the sample injection operation.

Disclosure of Invention

The object of the present invention consists, for example, in providing an extraction needle which is able to ameliorate the problem of insufficient convenience of the injection operation.

Embodiments of the invention may be implemented as follows:

the embodiment of the invention provides an extraction needle, which comprises at least two needle bars, an extraction needle, a gas guide needle, a matching component, a driving mechanism, an air inlet pipe and an air outlet pipe;

the at least two needle bars are sequentially arranged along the direction from the inner side to the outer side, and any two adjacent needle bars can slide mutually; the extraction needle is fixed on the needle bar at the inner side, and the gas guide needle is fixed on the needle bar at the outer side; the driving mechanism is connected with the innermost needle bar, and is used for driving the needle bar on the inner side to slide to a preset position in sequence along the axial upward direction relative to the needle bar on the outer side and then locked with the needle bar on the outer side through the matching component, or is used for driving the needle bar on the inner side to slide to be separated from the preset position in sequence along the axial downward direction relative to the needle bar on the outer side and then unlocked with the needle bar on the outer side through the matching component, so that the extraction needle and the gas guide needle are driven to move in stages, and the extraction needle penetrates or retracts the gas guide needle; the air inlet pipe and the air outlet pipe are respectively communicated with the air guide needle.

In addition, the extraction needle provided by the embodiment of the invention can also have the following additional technical characteristics:

optionally, the mating assembly includes a locking member and an unlocking member; the locking pieces are arranged on the at least two needle bars along the radial direction of the needle bars, and the locking pieces are used for penetrating and locking the needle bars which sequentially slide to the preset positions on the outer needle bars along the radial direction;

the at least two needle bars are slidably arranged on the unlocking piece, and the unlocking piece is used for abutting against the locking piece locked on the inner needle bar in the process that the needle bar on the inner side is separated from the preset position in a sliding mode relative to the outer side of the needle bar, so that the locking piece is sequentially unlocked with the outer needle bar.

Optionally, the at least two needle bars are each provided with a locking hole; the locking piece is movably arranged in the innermost locking hole along the radial direction;

the mating assembly further includes an elastic member; the elastic piece is arranged on the innermost needle bar and is connected with the locking piece, and the elastic piece is used for enabling the locking piece to have a movement trend of being inserted into the outer locking hole along the radial direction under the condition that the inner locking hole corresponds to the outer locking hole so as to lock the inner needle bar on the outer needle bar.

Optionally, the elastic piece is an elastic piece or a torsion spring; the elastic sheet or the torsion spring is propped against the needle bar along the extending direction of the needle bar, one end of the elastic sheet or the torsion spring is fixed with the needle bar, and the other end of the elastic sheet or the torsion spring is fixed with the locking piece.

Optionally, the unlocking piece is provided with at least one supporting inclined plane, and the at least one supporting inclined plane is distributed in a step-like manner along one side of the unlocking piece; the supporting inclined surface is used for being in sliding contact with the locking piece in the locking hole at the inner side in the process that the needle bar at the inner side is separated from the preset position in a sliding mode relative to the needle bar at the outer side, so that the locking piece sequentially exits from the locking hole at the outer side, and the needle bar at the inner side and the needle bar at the outer side are unlocked.

Optionally, the needle bars except the innermost side are provided with guide grooves extending along the axial direction, and the guide grooves are communicated with the corresponding locking holes;

the unlocking piece is in sliding fit with the guide groove, and the abutting inclined surface of the unlocking piece can be in sliding contact with the locking piece in the locking hole; the width of the guide groove is smaller than the diameter of the corresponding locking hole so as to prevent the locking piece in the corresponding locking hole from sliding to the corresponding guide groove.

Optionally, the extraction needle further comprises a mounting seat, and the mounting seat is provided with a sliding groove; the at least two needle bars are slidably arranged in the sliding groove, and the mounting seat is used for being mounted on the rack;

the mounting seat is provided with at least one limiting piece; the at least one limiting piece is arranged on the mounting seat and is used for abutting against the outer needle bar under the condition that the needle bar at the inner side is separated from the preset position in a sliding mode relative to the outer side of the needle bar, so that the outer side is prevented from moving in the axial downward direction.

Optionally, the number of the needle bars is two; the gas guide needle is fixed on the outer needle bar; the extraction needle comprises an extraction needle head; the extraction needle is fixed on the needle bar at the inner side, and the head of the extraction needle extends into the gas guide needle.

Optionally, the number of the needle bars is two; the gas guide needle is fixed on the outer needle bar; the extraction needle comprises an extraction needle head and an extraction catheter; the extraction needle head and the extraction catheter are fixed on the needle bar at the inner side; the extraction needle head penetrates through the extraction catheter, the head of the extraction needle head penetrates out of the head of the extraction catheter, and the extraction needle head and the extraction catheter are both penetrated into the gas guide needle.

Optionally, the number of the needle bars is three; the gas guide needle is fixed on the outermost needle bar; the extraction needle comprises an extraction needle head and an extraction catheter; the extraction needle head is fixed on the innermost needle bar, and the extraction catheter is fixed on the needle bar at the middle position.

The extraction needle of the embodiment of the invention has the beneficial effects that:

the extraction needle comprises at least two needle bars, an extraction needle, a gas guide needle, a matching component, a driving mechanism, an air inlet pipe and an air outlet pipe; at least two needle bars are sequentially arranged along the direction from the inner side to the outer side, and any two adjacent needle bars can slide mutually; the extraction needle is fixed on the needle bar at the inner side, and the gas guide needle is fixed on the needle bar at the outer side; the driving mechanism is connected with the innermost needle bar, and is used for driving the needle bar at the inner side to sequentially slide to a preset position relative to the needle bar at the outer side along an axially upward direction and sequentially locked with the needle bar at the outer side through the matching component, or is used for driving the needle bar at the inner side to sequentially slide to be separated from the preset position relative to the needle bar at the outer side along an axially downward direction and unlocked with the needle bar at the outer side through the matching component, so that the extraction needle and the gas guide needle are driven to move in stages, and the extraction needle passes through or retracts the gas guide needle; the air inlet pipe and the air outlet pipe are respectively communicated with the air guide needle.

The multi-stroke driving is realized by one driving mechanism, and the multi-functional sample injection can be realized simultaneously in design; the up-and-down movement of the gas guide needle and the movement of the extraction needle are combined into one driving mechanism, so that the multifunctional sample injection such as headspace sample injection and solid-phase microextraction sample injection is realized, and great convenience is brought.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is an isometric view of an elastomeric element of an extraction needle employing a torsion spring according to an embodiment of the present invention;

fig. 2 is a schematic structural view of an elastic member of an extraction needle according to a first view angle of a spring plate;

fig. 3 is a schematic view of a part of an elastic member of an extraction needle according to an embodiment of the present invention from a first view angle using a spring piece;

FIG. 4 is a partial cross-sectional view of A-A of FIG. 3;

FIG. 5 is an enlarged view of a portion of W in FIG. 4;

FIG. 6 is a schematic view of a structure of a needle bar with a locking hole and a guiding slot according to an embodiment of the present invention;

fig. 7 is a schematic view showing the structure of a gas guiding needle inserted into a headspace bottle according to an embodiment of the present invention.

Icon: 10-extracting needles; 100-needle bar; 110-a locking hole; 120-guiding grooves; 200-extracting needle; 210-a gas guiding needle; 300-mating assembly; 310-locking piece; 320-an elastic member; 330-unlocking piece; 331-a holding inclined plane; 400-a driving mechanism; 410-driving a motor; 420-a transmission mechanism; 500-air inlet pipe; 510-an air outlet pipe; 600-mounting seats; 610-a sliding groove; 700-limiting parts; 800-headspace bottle.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present invention, it should be noted that, if the terms "upper", "lower", "inner", "outer", and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or the azimuth or the positional relationship in which the inventive product is conventionally put in use, it is merely for convenience of describing the present invention and simplifying the description, and it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus it should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, if any, are used merely for distinguishing between descriptions and not for indicating or implying a relative importance.

It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.

The extraction needle 10 provided in this embodiment is described in detail below with reference to fig. 1 to 7.

Referring to fig. 1, 2, 3, 4 and 5, an embodiment of the present invention provides an extraction needle 10, which includes at least two needle bars 100, an extraction needle 200, a gas guiding needle 210, a matching component 300, a driving mechanism 400, a gas inlet pipe 500 and a gas outlet pipe 510; at least two needle bars 100 are sequentially arranged in the inside-to-outside direction, and any adjacent two needle bars 100 are slidable with each other; the extraction needle 200 is fixed to the inner needle bar 100, and the gas guide needle 210 is fixed to the outer needle bar 100; the driving mechanism 400 is connected with the innermost needle bar 100, and the driving mechanism 400 is used for driving the inner needle bar 100 to sequentially slide to a preset position along an axial upward direction relative to the outer needle bar 100 and sequentially locked with the outer needle bar 100 through the matching component 300, or the driving mechanism 400 is used for driving the inner needle bar 100 to sequentially slide away from the preset position along an axial downward direction relative to the outer needle bar 100 and unlock with the outer needle bar 100 through the matching component 300, so that the extraction needle 200 and the gas guide needle 210 are driven to move in stages, and the extraction needle 200 passes through or retracts the gas guide needle 210; the gas inlet pipe 500 and the gas outlet pipe 510 are respectively communicated with the gas guide needle 210.

It should be noted that: in the case where the extraction needle 200 is not required, only the gas guide needle 210 needs to be driven to insert or withdraw the headspace bottle 800. Whether the gas guide needle 210 independently enters the headspace bottle 800 for sampling or the extraction needle 200 and the gas guide needle 210 simultaneously enter the headspace bottle 800 for sampling, the gas circulation can be realized through the gas inlet pipe 500 and the gas outlet pipe 510 which are communicated with the gas guide needle 210, and the sample injection is completed. The gas outlet pipe 510 is provided on the outermost needle bar 100, and the gas inlet pipe 500 communicates with the gas guide needle 210.

The "direction from inside to outside" is the direction indicated by the arrow a in fig. 4, and the "direction from outside to inside" is the direction opposite to the direction indicated by the arrow a. The "axially upward direction" is the direction indicated by the arrow B in fig. 4, and the "axially downward direction" is the direction indicated by the arrow C in fig. 4.

The inner needle bar 100 is locked with or separated from the outer needle bar 100 through the matching component 300, and the inner needle bar 100 is used for synchronously moving under the condition of being locked with the outer needle bar 100 so as to drive the gas guide needle 210 to synchronously insert or withdraw the headspace bottle 800; the inner needle bar 100 is adapted to move relative to the outer needle bar 100 in a state of being separated from the outer needle bar 100, so as to drive the extraction needle 200 out of or retract the gas guide needle 210.

The needle bar 100 can be moved synchronously by the drive of the drive mechanism 400 after being locked, and the needle bar 100 can be moved relatively in order after being separated in order, so that the gas guide needle 210 and the extraction needle 200 can be extended in stages, and the extraction needle 200 and the gas guide needle 210 can be retracted in stages. Specifically, the gas guide needle 210 is first extended to be inserted into the headspace bottle 800, the extraction needle 200 is extended into the headspace bottle 800 through the gas guide needle 210, and then the extraction needle 200 is retracted, and the gas guide needle 210 is retracted.

At the highest position, at least two needle bars 100 are all locked together through the matching component 300, and the driving mechanism 400 drives at least two needle bars 100 to synchronously move downwards to drive the gas guide needle 210 to be inserted into the headspace bottle 800; after the extraction needle is moved to the preset position, the driving mechanism 400 continues to drive, so that the needle bars 100 from the outer side to the inner side are sequentially separated from the preset position relative to the outer side needle bars 100, and are unlocked relative to the outer side needle bars 100 through the matching assembly 300, so that the extraction needle 200 can be driven to move in a downward direction relative to the outer side needle bars 100 under the driving of the driving mechanism 400, and can be driven to insert the extraction needle 200 into the headspace bottle 800 through the gas guide needle 210. After the extraction needle is completely moved, the driving mechanism 400 drives the needle bar 100 to move upwards, the needle bar 100 on the inner side moves relative to the needle bar 100 on the outer side, the corresponding extraction needle 200 is driven to move upwards, after the extraction needle moves to a preset position, the extraction needle is sequentially locked and fixed with the needle bar 100 on the outer side through the matching assembly 300, and then the needle bar 100 on the outer side can be synchronously driven to move, so that the corresponding extraction needle 200 or the gas guide needle 210 is synchronously driven to move upwards for resetting until the extraction needle 200 and the gas guide needle 210 are all pulled out of the headspace bottle 800.

For example, the number of the needle bars 100 is two, the outer needle bar 100 is a first needle bar, the inner needle bar 100 is a second needle bar, the driving mechanism 400 is connected with the second needle bar, the driving mechanism 400 is used for driving the second needle bar to move, and the second needle bar is slidably arranged in the first needle bar; the gas guiding needle 210 is fixed on the first needle bar, and the gas inlet pipe 500 and the gas outlet pipe 510 are respectively communicated with the gas guiding needle 210; the extraction needle 200 is fixed on the second needle bar; the second needle bar is locked with or separated from the first needle bar through the matching component 300, and the second needle bar is used for driving the first needle bar to synchronously move under the condition of locking with the first needle bar so as to drive the gas guide needle 210 to synchronously insert or withdraw the headspace bottle 800; the second needle bar is used to move relative to the first needle bar in a state of being separated from the first needle bar, so as to drive the extraction needle 200 to pass out of or retract into the gas guide needle 210, to insert the headspace bottle 800 or to withdraw the headspace bottle 800.

Referring to fig. 4 and 5, in the present embodiment, the mating assembly 300 includes a locking member 310 and an unlocking member 330; the locking pieces 310 are provided on at least two needle bars 100 in the radial direction of the needle bars 100, and the locking pieces 310 are used for penetrating and locking the needle bars 100 sequentially slid to the preset positions on the outer needle bars 100 in the radial direction; at least two needle bars 100 are slidably disposed on the unlocking member 330, and the unlocking member 330 is configured to abut against the locking member 310 locked on the inner needle bar 100 during the process of sliding the inner needle bar 100 out of the preset position relative to the outer needle bar 100, so that the locking member 310 is sequentially unlocked from the outer needle bar 100.

The locking member 310 gradually moves in the inside-to-outside direction to sequentially lock the inside needle bar 100 with the outside needle bar 100, and then withdraws in the outside-to-inside direction by the unlocking member 330 to disengage the outside needle bar 100 from the inside needle bar 100. The locking of the locking member 310 and the unlocking of the unlocking member 330 are both accomplished during the relative up-and-down movement of the needle shaft 100.

For example, the locking member 310 is disposed on the second needle bar, and the locking member 310 is configured to lock onto the first needle bar during movement of the second needle bar relative to the first needle bar, so as to lock and fix the second needle bar and the first needle bar; the first needle bar is slidably disposed on the unlocking member 330, and the unlocking member 330 is configured to abut against the locking member 310 during the movement of the first needle bar relative to the unlocking member 330, so as to unlock the locking member 310 from the first needle bar.

Referring to fig. 4 and 5, in the present embodiment, at least two needle bars 100 are each provided with a locking hole 110; the locking piece 310 is movably arranged in the innermost locking hole 110 along the radial direction; the mating assembly 300 further includes an elastic member 320; the elastic member 320 is provided on the innermost needle bar 100, the elastic member 320 is connected to the locking member 310, and the elastic member 320 is used to make the locking member 310 have a movement tendency to be inserted into the outer locking hole 110 in a radial direction in a case where the inner locking hole 110 corresponds to the outer locking hole 110, so as to lock the inner needle bar 100 to the outer needle bar 100.

When the inner needle bar 100 moves to correspond to the locking hole 110 of the outer needle bar 100, the locking member 310 is locked into the outer locking hole 110 in a radial outward direction, so that the inner needle bar 100 is locked on the outer locking hole 110, locking of the inner needle bar 100 and the outer needle bar 100 is realized, and so on, until the locking member 310 is sequentially inserted into all the locking holes 110 in the inner-to-outer direction, and locking fixation of all the needle bars 100 is completed. The elastic member 320 functions to cause the locking member 310 to have a movement tendency to move radially outward so as to be sequentially inserted into the locking hole 110.

For example, the first needle bar is provided with a locking hole 110; the second needle bar is provided with a locking hole 110; the elastic member 320 is connected to the second needle bar, the locking member 310 is fixed to the elastic member 320, the locking member 310 is movably disposed in the locking hole 110 of the second needle bar, and the elastic member 320 is used to enable the locking member 310 to have a movement tendency of inserting the locking hole 110 of the first needle bar when the second needle bar moves to the locking hole 110 of the second needle bar relative to the first needle bar to correspond to the locking hole 110 of the first needle bar.

Referring to fig. 1 and 2, in the present embodiment, the elastic member 320 is an elastic sheet or a torsion spring; the elastic piece or the torsion spring is arranged on the needle bar 100 in an abutting manner along the extending direction of the needle bar 100, one end of the elastic piece or the torsion spring is fixed with the needle bar 100, and the other end of the elastic piece or the torsion spring is fixed with the locking piece 310.

"the elastic piece or the torsion spring is disposed against the needle bar 100 in the extending direction of the needle bar 100", the elastic piece or the torsion spring can make the locking piece 310 have a force of radially outward against the needle bar 100, and then have a restoring force of radially outward direction when the locking piece 310 is subjected to a radially inward force.

In the case that the locking holes 110 correspond, the locking member 310 is caught into the locking holes 110 on the outside by the elastic member 320. The unlocking member 330 pushes the locking member 310 in a radial inward direction to withdraw from the locking hole 110, and in the case that the locking member 310 corresponds to the locking hole 110, the locking member 310 has a movement tendency to return radially outward to be locked again into the locking hole 110 for return.

Referring to fig. 4 and 5, in the present embodiment, the unlocking member 330 is provided with at least one supporting inclined surface 331, and the at least one supporting inclined surface 331 is distributed stepwise along one side of the unlocking member 330; the abutment inclined surface 331 is used for sliding contact with the locking piece 310 in the locking hole 110 on the inner side in the process that the needle bar 100 on the inner side slides relative to the needle bar 100 on the outer side to be separated from the preset position, so that the locking piece 310 sequentially withdraws from the locking hole 110 on the outer side, and the needle bar 100 on the inner side is unlocked from the needle bar 100 on the outer side. Each of the holding slopes 331 serves to hold the locking member 310 out of the thickness of one needle bar 100 by a distance so that the inner needle bar is separated from the outer needle bar.

Specifically, the unlocking piece 330 is provided with an abutment inclined surface 331; the abutment inclined surface 331 is used for sliding contact with the locking piece 310 during the process that the second needle bar slides downwards relative to the first needle bar, so that the locking piece 310 is withdrawn from the locking hole 110 of the first needle bar, and the second needle bar can be separated from the first needle bar and then slide downwards continuously.

Except for the outermost needle bar 100, one holding inclined surface 331 is required to be correspondingly arranged for unlocking the needle bar 100 on the opposite outer side of the remaining needle bars 100, for example, when the number of the needle bars 100 is three, the number of the holding inclined surfaces 331 is two, and the two holding inclined surfaces 331 are sequentially arranged in a descending stepped manner along the left-to-right position in fig. 4, so that the locking pieces 310 can be sequentially in sliding contact with the locking pieces 310 in the needle bars 100 on the inner side in the process of sequentially sliding the needle bars 100 downwards, and the locking pieces 310 are held against the locking holes 110.

Referring to fig. 4, 5 and 6, in the present embodiment, the needle bars 100 other than the innermost side are each provided with a guide groove 120 extending in the axial direction, and the guide grooves 120 communicate with the corresponding locking holes 110; the unlocking piece 330 is in sliding fit with the guide groove 120, and the abutting inclined surface 331 of the unlocking piece 330 can be in sliding contact with the locking piece 310 in the locking hole 110; the guide grooves 120 have a width smaller than the diameter of the corresponding locking holes 110 to prevent the locking pieces 310 in the corresponding locking holes 110 from sliding toward the corresponding guide grooves 120.

The guide groove 120 communicates with the locking hole 110 so that the abutment inclined surface 331 is in sliding contact with the locking piece 310 in the locking hole 110; the guide groove 120 has a width smaller than the diameter of the locking hole 110 to prevent the locking piece 310 from sliding toward the guide groove 120.

After all the needle bars 100 are radially locked together by the locking member 310, they slide up and down along the axial length of the guide groove 120. When the holding inclined surface 331 moved downward into the guide groove 120 is in contact with the locking piece 310 in the locking hole 110, the locking piece 310 is held by the holding inclined surface 331 and retracted, until the locking piece 310 slides downward along the side surface of the unlocking piece 330, the inner needle bar 100 can continue to move downward relative to the outer needle bar 100, and the extraction needle 200 is inserted into the headspace bottle 800. After that, the needle bar 100 is driven to move upward, and the locking member 310 slides upward along the side surface of the unlocking member 330 until sliding to the locking hole 110 above the abutment slope 331, and then the locking member 310 is inserted into the locking hole 110 by the elastic member 320, thereby completing locking. And then continues to move upward, bringing the needle bar 100 to move upward synchronously.

Referring to fig. 4 and 5, in the present embodiment, the extraction needle 10 further includes a mounting base 600, and the mounting base 600 is provided with a sliding groove 610; at least two needle bars 100 slidably disposed in the sliding groove 610, and a mounting base 600 for mounting on a frame; the mount 600 is provided with at least one stop 700; at least one stopper 700 is provided on the mounting base 600, and the stopper 700 is used to abut against the outer needle bar 100 when the inner needle bar 100 slides away from the preset position relative to the outer needle bar 100, so as to prevent the outer needle bar 100 from moving in the axially downward direction.

After the driving mechanism 400 drives the needle bar 100 to move downwards to the preset position, the limiting piece 700 abuts against the needle bar 100 on the outer side, so that the outer side needle bar 100 cannot move under the condition that the needle bar 100 on the inner side opposite to the outer side continuously moves downwards to be separated from the preset position, and the acting force of the unlocking piece 330 for abutting against the locking piece 310 to retract can be provided until the locking piece 310 is fully retracted, and the inner side needle bar 100 continuously moves downwards relative to the outer side needle bar 100. The other needle bars 100 except the innermost needle bar 100 are provided with a stopper 700, or may be one stopper 700 having at least one stopper portion for sequentially stopping the outer needle bar 100.

For example, the mount 600 is provided with a sliding groove 610; the first needle bar is slidably disposed in the sliding groove 610, and the limiting member 700 is disposed on the mounting base 600, where the limiting member 700 is used to abut against the first needle bar when the second needle bar is separated from the first needle bar, so as to prevent the first needle bar from moving.

In the present embodiment, the number of needle bars 100 is two; the gas guide needle 210 is fixed to the outer needle bar 100; extraction needle 200 comprises an extraction needle; the extraction needle is fixed to the needle shaft 100 on the inside and the head of the extraction needle protrudes into the gas guiding needle 210. The head of the extraction needle extends into the gas guide needle 210, and the gas guide needle 210 plays a role in protecting and guiding the head of the extraction needle. The gas guiding needle 210 is first extended and inserted into the headspace bottle 800, the extraction needle penetrates the gas guiding needle 210 and extends into the headspace bottle 800, and then the extraction needle is retracted into the gas guiding needle 210, and the gas guiding needle 210 is retracted.

Referring to fig. 4 and 5, in the present embodiment, the number of needle bars 100 is two; the gas guide needle 210 is fixed to the outer needle bar 100; the extraction needle 200 comprises an extraction needle head and an extraction catheter; the extraction needle and the extraction catheter are all fixed on the needle bar 100 on the inner side; the extraction needle penetrates through the extraction catheter, the head of the extraction needle penetrates out of the head of the extraction catheter, and the extraction needle and the extraction catheter are both penetrated inside the gas guide needle 210.

In the initial state, the head of the extraction needle is already penetrating the head of the extraction duct, and both the extraction needle and the extraction duct are penetrating inside the gas guiding needle 210. Similarly, the gas guiding needle 210 is first extended and inserted into the headspace bottle 800, the extraction needle penetrates the gas guiding needle 210 and extends into the headspace bottle 800, and then the extraction needle retracts into the gas guiding needle 210, and the gas guiding needle 210 retracts.

In the present embodiment, the number of needle bars 100 is three; the gas guide needle 210 is fixed to the outermost needle bar 100; the extraction needle 200 comprises an extraction needle head and an extraction catheter; the extraction needle is fixed to the innermost needle shaft 100 and the extraction catheter is fixed to the needle shaft 100 in the intermediate position.

The gas guiding needle 210 is extended into the headspace bottle 800, the extraction catheter is extended into the gas guiding needle 210, the extraction needle is extended into the gas guiding needle 210 through the extraction catheter and penetrates the gas guiding needle 210 to extend into the headspace bottle 800, then the extraction needle is retracted under the protection and guiding of the extraction catheter, and the gas guiding needle 210 is retracted.

Referring to fig. 2, the driving mechanism 400 further includes a driving motor 410 and a transmission mechanism 420, the driving motor 410 is connected with the transmission mechanism 420, the innermost needle bar 100 is connected with the transmission mechanism 420, and the driving motor 410 drives the innermost needle bar 100 to move up and down through the transmission mechanism 420, so as to sequentially drive the outer needle bar 100 to move up or down.

Referring to fig. 4, 5 and 7, an extraction needle 10 according to the present embodiment is provided, and the working principle of the extraction needle 10 is: the gas guide needle 210 is inserted into the upper space position of the headspace bottle 800 by downwards moving the innermost needle bar 100 from the highest position, so that the gas of the headspace bottle 800 can be guided to be guided out of the headspace bottle 800 through the gas inlet pipe 500 and the gas outlet pipe 510 on the needle, and headspace sample injection is realized by combining other pipelines; the other is that the locking piece 310 is ejected out by the supporting inclined plane 331, so that the needle bar 100 which is continuously downward can drive the extraction needle 200 to continuously move downward, the head of the extraction needle 200 is exposed in the upper space of the headspace bottle 800 for extraction and concentration, after concentration, the driving mechanism 400 drives the needle bar 100 to move upward to the supporting inclined plane 331, and after the locking piece 310 is driven by the elastic force of a spring piece or a torsion spring to move into the locking hole 110 along the supporting inclined plane 331, so that the needle bar 100 and the needle bar 100 at the outer side are kept relatively static, the needle bar 100 is continuously lifted to move upward, and the gas guide needle 210 leaves the upper space of the headspace bottle 800 and leaves the bottle pad, so that different strokes of various extraction and sample feeding modes are completed.

The extraction needle 10 provided in this embodiment has at least the following advantages:

through a actuating mechanism 400 and at least two needle bars 100 locking and breaking away from, realize the drive of multi-stroke, gas guide needle 210 and extraction needle 200 are fixed on different needle bars 100, and the drive of needle bar 100 can drive headspace sample introduction and solid phase microextraction sample introduction and realize alone, perhaps realizes in the lump, realizes multi-functional sample introduction, has brought very big convenience for the sample introduction operation, improves sample introduction efficiency.

The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (7)

1. An extraction needle (10), characterized by comprising:

the extraction device comprises at least two needle bars (100), an extraction needle (200), a gas guide needle (210), a matching assembly (300), a driving mechanism (400), an air inlet pipe (500) and an air outlet pipe (510), wherein the at least two needle bars (100) are sequentially arranged along the direction from the inner side to the outer side, and any two adjacent needle bars (100) can slide mutually;

the extraction needle (200) is fixed on the inner needle bar (100), and the gas guide needle (210) is fixed on the outer needle bar (100); the driving mechanism (400) is connected with the innermost needle bar (100), the driving mechanism (400) is used for driving the needle bar (100) on the inner side to slide to a preset position along the axial upward direction relative to the needle bar (100) on the outer side in sequence and is locked with the needle bar (100) on the outer side through the matching component (300), or the driving mechanism (400) is used for driving the needle bar (100) on the inner side to slide to be separated from the preset position along the axial downward direction relative to the needle bar (100) on the outer side and is unlocked with the needle bar (100) on the outer side through the matching component (300), so that the extraction needle (200) and the gas guide needle (210) are driven to move in stages and the extraction needle (200) passes through or retracts into the gas guide needle (210); the air inlet pipe (500) and the air outlet pipe (510) are respectively communicated with the air guide needle (210);

the mating assembly (300) includes a locking member (310) and an unlocking member (330); the locking pieces (310) are arranged on the at least two needle bars (100) along the radial direction of the needle bars (100), and the locking pieces (310) are used for penetrating and locking the needle bars (100) which sequentially slide to the preset positions on the outer needle bars (100) along the radial direction; the at least two needle bars (100) are slidably arranged on the unlocking piece (330), and the unlocking piece (330) is used for abutting against the locking piece (310) locked on the needle bar (100) on the inner side in the process that the needle bar (100) on the inner side is separated from the preset position in a sliding way relative to the needle bar (100) on the outer side, so that the locking piece (310) is sequentially unlocked with the needle bar (100) on the outer side;

the at least two needle bars (100) are provided with locking holes (110); the locking piece (310) is movably arranged in the innermost locking hole (110) along the radial direction; the mating assembly (300) further includes an elastic member (320); the elastic member (320) is disposed on the innermost needle bar (100), the elastic member (320) is connected with the locking member (310), and the elastic member (320) is used for enabling the locking member (310) to have a movement trend of inserting the locking hole (110) on the outer side along the radial direction when the locking hole (110) on the inner side corresponds to the locking hole (110) on the outer side so as to lock the needle bar (100) on the inner side on the needle bar (100) on the outer side;

the unlocking piece (330) is provided with at least one supporting inclined surface (331), and the at least one supporting inclined surface (331) is distributed in a step-like manner along one side of the unlocking piece (330); the abutting inclined surface (331) is used for being in sliding contact with the locking piece (310) in the locking hole (110) at the inner side in the process that the needle bar (100) at the inner side is separated from the preset position in a sliding mode relative to the needle bar (100) at the outer side, so that the locking piece (310) sequentially exits from the locking hole (110) at the outer side, and the needle bar (100) at the inner side is unlocked from the needle bar (100) at the outer side.

2. The extraction needle (10) according to claim 1, characterized in that:

the elastic piece (320) is an elastic sheet or a torsion spring; the elastic piece or the torsion spring is propped against the needle bar (100) along the extending direction of the needle bar (100), one end of the elastic piece or the torsion spring is fixed with the needle bar (100), and the other end of the elastic piece or the torsion spring is fixed with the locking piece (310).

3. The extraction needle (10) according to claim 1, characterized in that:

the needle bars (100) except the innermost side are provided with guide grooves (120) extending along the axial direction, and the guide grooves (120) are communicated with the corresponding locking holes (110);

the unlocking piece (330) is in sliding fit with the guide groove (120), and the abutting inclined surface (331) of the unlocking piece (330) can be in sliding contact with the locking piece (310) in the locking hole (110); the guide grooves (120) have a width smaller than the diameter of the corresponding locking holes (110) to prevent the locking pieces (310) in the corresponding locking holes (110) from sliding toward the corresponding guide grooves (120).

4. The extraction needle (10) according to claim 1, characterized in that:

the extraction needle (10) further comprises a mounting seat (600), and the mounting seat (600) is provided with a sliding groove (610); the at least two needle bars (100) are slidably arranged in the sliding groove (610), and the mounting seat (600) is used for being mounted on a rack;

the mounting seat (600) is provided with at least one limiting piece (700); the at least one limiting piece (700) is arranged on the mounting seat (600), and the limiting piece (700) is used for abutting against the outer needle bar (100) under the condition that the inner needle bar (100) slides away from the preset position relative to the outer needle bar (100) so as to prevent the outer needle bar (100) from moving in the axial downward direction.

5. The extraction needle (10) according to any one of claims 1-4, characterized in that:

the number of the needle bars (100) is two; the gas guiding needle (210) is fixed on the outer needle bar (100);

the extraction needle (200) comprises an extraction needle head; the extraction needle is fixed to the needle shaft (100) on the inside, and the head of the extraction needle protrudes into the gas guide needle (210).

6. The extraction needle (10) according to any one of claims 1-4, characterized in that:

the number of the needle bars (100) is two; the gas guiding needle (210) is fixed on the outer needle bar (100);

the extraction needle (200) comprises an extraction needle head and an extraction catheter; the extraction needle head and the extraction catheter are fixed on the needle bar (100) on the inner side; the extraction needle head penetrates through the extraction catheter, the head of the extraction needle head penetrates out of the head of the extraction catheter, and the extraction needle head and the extraction catheter are both penetrated into the gas guide needle (210).

7. The extraction needle (10) according to any one of claims 1-4, characterized in that:

the number of the needle bars (100) is three; the gas guiding needle (210) is fixed on the outermost needle bar (100);

the extraction needle (200) comprises an extraction needle head and an extraction catheter; the extraction needle is fixed on the innermost needle bar (100), and the extraction catheter is fixed on the needle bar (100) at the middle position.