CN103893995B - A kind of solid-phase micro-extracting device - Google Patents

Abstract

The invention discloses a solid-phase microextraction device. It includes a push rod and an extraction head connected to the push rod, the push rod and the extraction head are detachably connected; the push rod is sleeved in the push tube, and the push rod can be to move, and the push rod extends from a port of the push tube; the push tube is provided with an outer support protection tube, and one end of the outer support protection tube is connected to the push tube, and The push cylinder can move along the axial direction of the outer support protection tube; the extraction head extends from the other end of the outer support protection tube. The invention innovates the structure of the traditional device, greatly simplifies the handle part (push rod and other parts), the handle part has the characteristics of simple assembly, easy replacement of parts, and replaceable extraction head, and is similar to commercial handles and extraction The head is compatible, which increases the use efficiency of the handle, saves the cost of repurchasing the handle when replacing the extraction head, and facilitates commercial production and promotion.

Description

A solid phase microextraction device

technical field

The invention relates to a solid-phase microextraction device.

Background technique

As the analysis of complex trace samples becomes more and more common and important, sample preparation and pretreatment have become an essential step and one of the most critical steps to determine the reliability of analysis results. Therefore, the development of efficient and rapid The method of sample pretreatment has become a subject that must be studied and a goal that has always been pursued in the field of analysis. The solid phase microextraction sample processing method can meet such requirements, and the core components of the processing method are the handle and the coating. Currently commercialized handles are available in two types: disposable and multiple-use with replaceable extraction heads. Disposable handles require strict operation during use. If the extraction head is damaged, the handle will immediately lose its use value; the replaceable handle has a complex structure, cumbersome steps to use, and requires multi-step operations, and these two types of handles are expensive, which is not conducive to promotion of the method.

Contents of the invention

The purpose of the present invention is to provide a solid-phase microextraction device, which is easy to assemble, and the parts (extraction head) can be replaced, and has certain commercial promotion value.

The solid-phase microextraction device provided by the present invention includes a push rod and an extraction head connected to the push rod, and the push rod and the extraction head are detachably connected;

The push rod is sleeved in a push tube, the push rod can move along the axial direction of the push tube, and the push rod extends from a port of the push tube;

An outer support protection tube is arranged outside the push tube, one end of the outer support protection tube is connected to the push tube, and the push tube can move along the axial direction of the outer support protection tube; The extraction head extends from the other port of the outer support protection tube.

In the above-mentioned solid-phase microextraction device, the push rod and the extraction head can specifically be threaded, flanged, socketed, ferrule-type or clamped, and can function as a universal connection. Therefore, the extraction head described in the present invention can be replaced, and parts such as push rods can be reused.

In the above-mentioned solid-phase microextraction device, the extraction head is covered with an extraction head protection tube, and a ring cavity is provided between the extraction head and the extraction head protection tube, and the extraction head protection tube is used to protect the The above extraction head can be made of stainless steel tube.

In the above solid-phase microextraction device, one end of the protection tube for the extraction head is connected to one end of the push cylinder, so that the extension and retraction of the protection tube for the extraction head can be realized through the push rod.

In the solid-phase microextraction device of the present invention, both the push rod and the push cylinder can use polyvinyl chloride PVC plastic pipes; the extraction head protection tube can use stainless steel pipes; the extraction head can be a certain thickness of quartz fiber or stainless steel wire; the outer support protection tube can be made of high-temperature material, such as aluminum tube; the air-tight gasket can be silicon rubber.

The solid-phase microextraction device of the present invention innovates the structure of the traditional device, greatly simplifies the handle part (push rod and other components), and cancels the traditionally designed Z-guide groove, O-ring, visible window, spring And positioning thread and other structures, the handle part has the characteristics of easy assembly, easy replacement of parts, and replaceable extraction head, and is compatible with commercial handles and extraction heads, thereby increasing the use efficiency of the handle and saving the replacement of extraction heads. The cost of the handle is low, and it is convenient for commercial production and promotion.

Description of drawings

Fig. 1 is a schematic structural diagram of a solid-phase microextraction device of the present invention.

Fig. 2 is a schematic diagram of the replaceable extraction head in the solid phase microextraction device of the present invention.

Fig. 3 is a schematic diagram of the solid-phase microextraction device of the present invention (with the outer supporting protection tube removed).

The marks in the figure are as follows:

1 push rod, 2 push cylinder, 3 handle outer support protection tube, 4 extraction head protection tube, 5 extraction head, 6 air-tight gasket, 7, 9 connecting parts, 8 sealing gasket.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings, but the present invention is not limited to the following embodiments.

As shown in Figures 1-3, the solid-phase microextraction device provided by the present invention includes: a push rod 1, a push cylinder 2, and a handle outer layer support protection tube 3, and the step-by-step extraction of the extraction head is realized by pushing out and pulling back the push rod 1 Extend and retract. The push rod 1 and the extraction head 5 are connected through a connecting part 7, specifically a threaded connection, so as to realize the extension and retraction of the extraction head 5. The extraction head 5 is covered with an extraction head protection tube 4, and a ring chamber is arranged between the two to protect the extraction head 5. The push cylinder 2 and the protection tube 4 of the extraction head are connected through a connecting part 9, specifically a ferrule-type connection, so as to realize the extension and retraction of the protection tube 4 of the extraction head. A sealing gasket 8 is provided between the part where the extraction head 5 is connected to the protection tube 4 of the extraction head, so as to ensure that there will be no sample loss when analyzing the sample. The push rod 1 just passes through the push cylinder 2, and it can move along the axial direction of the push cylinder 2, and the necessary friction ensures the positioning of the push rod 1 during pushing and pulling. The above-mentioned handle connected with the replaceable extraction head is finally fixed in the handle outer layer support protection tube, wherein the airtight gasket 6 is placed inside the handle outer layer support protection tube 3 and along the axis of the handle outer layer support protection tube 3 It is set in the opposite direction, and its function is to play a sealing role when the extraction head is retracted and sampled. When the extraction head 5 is extended, it can be used to extract different samples, and then used for analysis.

In the solid-phase microextraction device provided by the present invention, the connecting parts 7 and 9 that play a connecting role are universal, and any method that can be connected to the handle can be used, such as threaded connection, flange connection, socket connection, ferrule type connection or clamp connection, etc.

In the solid-phase microextraction device provided by the present invention, the push rod 1 and the push cylinder 2 can adopt polyvinyl chloride PVC plastic tubes; the handle outer layer support protection tube 3 can adopt high-temperature-resistant materials, such as aluminum tubes; the extraction head protection tube 4 can be a stainless steel tube; the extraction head 5 can be a certain thickness of quartz fiber or stainless steel wire; the air-tight gasket 6 can be silicon rubber.

Claims (4)

1. a solid-phase micro-extracting device, is characterized in that: the extracting head that described device comprises a push rod and is connected with described push rod, for removably connecting between described push rod and described extracting head;

Described pushing rod sleeve is located in a pushing cylinder, and described push rod can moving axially along described pushing cylinder, and described push rod extends from the Single port of described pushing cylinder;

Described push rod is just through described pushing cylinder, and it can moving axially along described pushing cylinder, and necessary friction ensure that the location in described push rod push-and-pull process;

The outer sheathed outer supportive protection pipe of described pushing cylinder, one end of described outer supportive protection pipe is connected with described pushing cylinder, and described pushing cylinder can moving axially along described outer supportive protection pipe; Described extracting head is extended from the other end of described outer supportive protection pipe;

Air packing is positioned over the inside of described outer supportive protection pipe, and arranges along the axis of described outer supportive protection pipe.

2. solid-phase micro-extracting device according to claim 1, is characterized in that: between described push rod with described extracting head for being threaded, Flange joint, socket joint be connected, bite type connects or clamp connection.

3. solid-phase micro-extracting device according to claim 1 and 2, is characterized in that: described extracting head is coated with extracting head protection tube, and is provided with ring cavity between described extracting head and described extracting head protection tube.

4. solid-phase micro-extracting device according to claim 3, is characterized in that: described one end of extracting head protection tube is connected with one end of pushing cylinder.