CN106419974B - Needle set for fat surgery - Google Patents

Abstract

The invention relates to a needle combination for fat surgery, which comprises an extraction needle and a filling needle, and is characterized in that the extraction needle comprises a needle point (11), a needle tube (12) and a connecting seat (13) which are connected in sequence, and one end of the needle tube (12) connected with the needle point (11) is provided with needle holes (121) which are distributed in a spiral shape; the filling needle comprises a needle point (21), a needle tube (22) and a connecting seat (23) which are sequentially connected, wherein the needle point (21) is in a gentle arc shape, a needle hole (221) is formed in one end, connected with the needle point (21), of the needle tube (22), and the distance between the needle point (21) and the adjacent needle hole (221) is 2-3 mm. The fat surgical needle has the characteristics of small damage to fat cells, small damage to a fat extraction operation area, high extraction efficiency and convenience in use, and the safety of the operation is improved.

Description

Needle set for fat surgery

Technical Field

The invention relates to the field of fat extraction and transplantation, and in particular to a needle combination for fat cell extraction and transplantation surgery.

Background technique

As people's material level improves, they pay more and more attention to their appearance and image. Many people hope to make themselves more perfect through plastic surgery. After liposuction and autologous fat transplantation became the methods confirmed by the plastic surgery community, they were gradually applied to various fields of cosmetic surgery. Liposuction is a surgical method that uses various types of liposuction tools to suck out excess fat tissue while retaining the dermis and superficial tissue to reshape the appearance of the surgical area. The currently used tumescent negative pressure liposuction is a surgical method that uses a large negative pressure, specific surgical instruments and tumescent anesthesia technology to suck out locally accumulated fat tissue to achieve the purpose of improving bloated body shape or body sculpture. Autologous fat transplantation is a method of transplanting fat cells extracted from the body to other parts of the body. As its own tissue, its biological characteristics are far superior to any prosthetic material, and it will not produce immune response or rejection reaction.

Fat extraction needles and filling needles are commonly used in liposuction and autologous fat transplantation. However, there is a disconnect between the existing surgical needles and what doctors need during surgery. Medical device manufacturers do not participate in clinical practice and cannot fully understand the requirements and experience of doctors for instruments during surgery. For example, the needle holes of existing fat extraction needles are arranged in a "品" shape. This arrangement can easily cause problems such as uneven fat extraction, uneven fat extraction areas, and uneven liposuction in connection; the shape of the needle holes does not conform to the morphology of fat cells, resulting in severe damage to fat cells, excessive oil content, and severe damage to the fat extraction area; the inner walls of the extraction needle and the filling needle are not smooth, which can easily lead to problems such as fat cell damage and blockage in the needle tube.

At present, in order to give patients a good experience and reduce fear during the surgery, intravenous combined anesthesia is often used. It is equally important to use scientifically designed and efficient surgical needles to reduce anesthesia time and anesthetic drugs while efficiently removing fat and reducing damage, reducing the accumulation and metabolism of anesthetic drugs in the body, and reducing anesthetic drugs to increase surgical safety.

Therefore, there is an urgent need for a (group of) efficient fat surgery needles that are reasonably designed, cause little damage to fat cells, and are easy to use.

Summary of the invention

In order to solve the above technical problems, the inventors have conducted intensive research and provided a needle combination for fat surgery, which includes an extraction needle and a filling needle. The extraction needle adopts a circular or elliptical needle hole that conforms to the morphology of fat cells, and the size and arrangement of the needle holes are reasonably arranged; the filling needle adopts a blunt needle tip, and the distance between the needle tip and the needle hole is reasonably set. A needle combination for fat surgery is designed that has little damage to fat cells, is easy to use, and can greatly improve the safety of the operation, thereby completing the present invention.

The object of the present invention is to provide a needle assembly for fat surgery, including an extraction needle and a filling needle, wherein:

The extraction needle comprises a needle tip 11, a needle tube 12 and a connection seat 13 connected in sequence, wherein the needle tip 11 is used to guide the movement of the needle tube 12; the needle tube 12 is used to transmit the extracted fat cells, and one end thereof connected to the needle tip 11 is provided with a plurality of needle holes 121 distributed along a spiral shape; the connection seat 13 is used to connect the needle tube 12 with the negative pressure device;

The filling needle includes a needle tip 21, a needle tube 22 and a connecting seat 23 connected in sequence. The needle tip 21 is in a gentle arc shape and is used to guide the movement of the needle tube 22; the needle tube 22 is used to transfer the fat cells to be filled; and the connecting seat 23 is used to connect the needle tube 22 with the injection device.

The needle assembly for fat surgery provided by the present invention has the following beneficial effects:

(1) The needle holes of the extraction needle are arranged in a spiral shape, so that the extraction needle extracts fat in a columnar manner in the fat layer, extracting fat cells to the maximum extent within a unit area. Columnar fat extraction has the characteristics of efficient fat extraction, avoiding multiple reciprocating extractions, less tissue damage, and less needle eye color. At the same time, it reduces anesthesia time and anesthetic drugs, reduces the accumulation and metabolism of anesthetic drugs in the body, and increases the safety of surgery;

(2) The extraction needle uses a round or oval needle hole that conforms to the morphology of fat cells to maintain the integrity of the cell membrane to the greatest extent;

(3) According to the extraction needles of different lengths and diameters, 3-5 needle holes are set to maximize the amount of fat extracted while maintaining the negative pressure in the fat extraction needle;

(4) Based on the distribution of negative pressure in the extraction needle, the extraction needle is designed with pinholes of different sizes to ensure uniform pressure during the fat extraction process and protect the consistent cell morphology;

(5) The needle tube of the extraction needle is designed to be bent at 120° to 135° near the connection seat, so that the extraction needle can easily complete fat extraction and conform to the physiological curvature of the human body;

(6) Keeping a certain distance between the needle holes of the extraction needle helps to maintain the strength of the needle tube and prevent the needle tube from breaking in the body during liposuction;

(7) The tip of the filling needle is designed to be blunt to prevent fat from being injected into blood vessels, prevent fat embolism, and avoid damage to facial motor and sensory nerves;

(8) A safe distance is set between the tip of the filling needle and the needle hole to effectively prevent the filling needle from accidentally piercing a blood vessel and injecting fat into the flowing blood, thereby preventing the occurrence of fat embolism.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 shows an extraction needle according to a preferred embodiment of the present invention;

FIG2 shows an extraction needle with a bent needle tube according to a preferred embodiment of the present invention;

FIG. 3 shows a filling needle according to a preferred embodiment of the present invention.

Description of Figure Numbers:

11-needle tip;

12-needle tube;

121-pinhole;

122-bending point;

13-connecting seat;

131-threaded interface;

21-needle tip;

22-needle tube;

221-pinhole;

23-connecting seat;

231-Threaded interface.

Detailed ways

The following detailed description of the present invention will make the features and advantages of the present invention more clear and explicit.

The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise noted.

The needle combination for fat surgery provided by the present invention comprises a fat extraction needle and a filling needle. The extraction needle extracts fat cells from a part of the body with excessive fat. The fat cells are processed specifically and then re-implanted into the body through the filling needle.

In the present invention, as shown in FIG. 1 , the extraction needle comprises a needle tip 11, a needle tube 12 and a connecting seat 13 connected in sequence, wherein the needle tip 11 is used to guide the movement of the needle tube 12; the needle tube 12 is used to transmit the extracted fat cells, and one end thereof connected to the needle tip 11 is provided with a plurality of needle holes 121 distributed in a spiral shape; the connecting seat 13 is used to connect the needle tube 12 with the negative pressure device.

The needle tip 11 of the extraction needle is closed. The connection seat 13 fixes the extraction needle to the negative pressure device, which uses negative pressure to extract fat cells from the body through the extraction needle. The negative pressure device is a professional medical device, such as a syringe.

The pinholes of the existing fat extraction needles are arranged in a "pin" shape, which is easy to cause problems such as uneven fat extraction, uneven fat extraction areas, and uneven connection of fat suction causing blockage in the needle tube. In the present invention, the spirally distributed pinholes 121 enable the extraction needle to form a columnar fat extraction in the fat layer. The columnar fat extraction extracts fat cells to the maximum extent per unit area, and the fat extraction is continuous and uniform, avoiding multiple reciprocating extractions, and the problem of needle tube 12 being blocked during the operation will not occur. It has the characteristics of less tissue damage and less needle eye coloring, while reducing anesthesia time and anesthesia medication, reducing the accumulation and metabolism of anesthetic drugs in the body, and increasing the safety of the operation.

In a preferred embodiment, the needle tip 11 of the extraction needle is conical, which is convenient for penetrating the surface layer of the skin and entering the fat layer under the skin; the needle tip 11 of the extraction needle can also be a gentle arc shape to avoid puncturing blood vessels or damaging facial motor nerves and sensory nerves, and can be selected for use according to the specific fat extraction site.

In a preferred embodiment, the pinhole 121 is circular or elliptical. Since mature fat cells are circular or elliptical, the shape of the pinhole 121 conforms to the morphology of fat cells and can maintain the integrity of the cell membrane of fat cells to the greatest extent. At the same time, when the circular or elliptical pinhole 121 is set to be divided into an upper and lower part, the lower part performs a fat cell extraction when passing through the fat layer, and the upper part performs a second extraction when reciprocating, thereby forming two, efficient fat cell collections in one fat extraction tunnel. Pinholes of other shapes, such as rectangles, are prone to damage fat cells, which in turn makes the extracted fat cells contain more oil and the fat extraction area is severely damaged.

In a preferred embodiment, the pinhole 121 has the same diameter. When the pinhole 121 is circular, the diameter is 2 mm to 3 mm; when the pinhole 121 is elliptical, the diameter is 2 mm×3 mm (i.e., short diameter×long diameter); the inner diameter of the needle tube 12 is 3 mm to 4 mm. The diameter of the pinhole 121 and the diameter of the needle tube 12 protect the swelling of the fat cells and maintain their integrity and good permeability after anesthesia and during the extraction process.

In a preferred embodiment, the thickness of the needle tube 12 of the extraction needle is 0.4 mm to 0.6 mm to ensure the strength of the extraction needle.

In a preferred embodiment, according to the characteristics that the negative pressure is smaller at the proximal end of the needle tip 11 and larger at the distal end of the needle tip 11, the aperture of the needle hole 121 is distributed from large to small in the spiral direction from the needle tip 11 to the connecting seat 13. This aperture design ensures that the pressure of fat is uniform during the extraction process and protects the consistent morphology of fat cells.

In a preferred embodiment, according to extraction needles of different lengths and diameters, the number of needle holes 121 is 3 to 5, preferably 3, which can better maintain the negative pressure intensity in the extraction needle while ensuring the fat extraction amount to the greatest extent. That is, if the number of needle holes 121 is less than 3, the extraction rate is slow, and if the number of needle holes 121 is greater than 5, the negative pressure in the needle tube 12 is small, and the fat cells cannot be effectively driven to move.

In a preferred embodiment, there is a set distance between adjacent needle holes 121 of the extraction needle, and the set distance is 1mm to 2mm. The needle holes 121 of the extraction needle are distributed along a spiral shape while ensuring a specific distance between adjacent needle holes, thereby strengthening the strength of the needle tube and preventing the needle tube from breaking in the body during liposuction.

In a preferred embodiment, as shown in FIG. 2 , the end of the needle tube 12 of the extraction needle near the connection seat 13 is V-shaped and bent at a bending angle of 120° to 135°. Preferably, the distance between the bending point 122 and the connection seat 13 is 1/5 to 1/7 of the length of the needle tube 12. In specific fat extraction sites, such as the buttocks, the curved extraction needle is easier for the operator to use than the straight extraction needle, and can easily complete 360° fat extraction on three sides, which conforms to the physiological curvature of the human body. The bending point 122 refers to the point where the needle tube 12 starts to bend.

In a preferred embodiment, the connection end between the connection seat 13 and the negative pressure device is a threaded interface 131, which is fixed to the negative pressure device by a threaded connection. The threaded connection is more secure than the squeeze-in connection and has no risk of the needle falling off.

In the present invention, as shown in FIG3 , the filling needle comprises a needle tip 21, a needle tube 22 and a connection seat 23 connected in sequence. A needle hole 221 is provided at one end of the needle tube 22 of the filling needle connected to the needle tip 21. The needle tip 21 is used to guide the movement of the needle tube 22; the needle tube 22 is used to transfer the fat cells to be filled; the connection seat 23 is used to connect the needle tube 22 with the push injection device. The push injection device provides pressure to the needle tube 22, so that the fat cells to be filled flow out of the needle hole 221.

In a preferred embodiment, the needle tip 21 of the filling needle is in a gentle arc shape, which is different from the disadvantage of a sharp needle tip that easily punctures blood vessels. This can avoid fat embolism caused by fat injection into blood vessels, and similarly avoid damage to facial motor nerves and sensory nerves.

In a preferred embodiment, the number of the needle holes 221 of the filling needle is 1 to 2, preferably 1.

In a preferred embodiment, the distance between the needle tip 21 of the filling needle and the adjacent needle hole 221 is 2 mm to 3 mm, preferably 2 mm. The filling location of fat cells is often the face. According to the diameter of blood vessels in different parts of facial anatomy, the distance between the needle tip 21 and the needle hole 221 is designed to be larger than the diameter of the facial blood vessels. This can effectively prevent the filling needle from accidentally piercing the blood vessel and injecting fat into the flowing blood, effectively prevent the occurrence of fat embolism, and greatly improve the safety of the operation.

In a preferred embodiment, the inner diameter of the needle tube 22 is 1 mm to 1.3 mm. The tube diameter within this range allows the fat particles to be transplanted to be arranged in a relatively thin straight line to avoid clumping.

In a preferred embodiment, the pinhole 221 is circular or elliptical. When the pinhole 221 is circular, the aperture size is 1.2 mm to 1.3 mm. When the pinhole 221 is elliptical, the aperture size is 1.2 mm×1.3 mm (ie, short diameter×long diameter).

In a preferred embodiment, the tail of the connecting seat 23 of the filling needle is connected to the push injection device, and the connecting end is a threaded interface 231. The filling needle is fixed to the push injection device by a threaded connection. Similarly, the threaded connection is more secure than the squeeze-in connection, which greatly reduces the risk of the needle falling off.

In a preferred embodiment, the extraction needle and the filling needle not only have smooth outer walls, but also have inner walls that have been repeatedly polished, smooth and flat without protrusions, thereby ensuring that fat cells can pass through the needle tube (12, 22) without hindrance and reducing damage to the fat cells.

In a preferred embodiment, the extraction needle and the filling needle are integrally formed and made of steel or alloy steel.

Example

Example 1

A needle combination for fat surgery comprises an extraction needle I, an extraction needle II and a filling needle.

As shown in FIG1 , the extraction needle I is a hollow structure with a smooth inner wall and no obvious curvature, and includes a needle tip 11, a needle tube 12, and a connecting seat 13 connected in sequence. The needle tip 11 is a closed cone, and the end of the needle tube 12 connected to the needle tip 11 is provided with three needle holes 121 distributed along a spiral shape, and the distance between adjacent needle holes 121 is 2 mm. The needle hole 121 is elliptical, and the aperture of the needle hole 121 along the spiral direction from the needle tip 11 to the connecting seat 13 is 2 mm×2.5 mm, 2 mm×3 mm, and 2 mm×3.5 mm, respectively. The extraction needle I can be connected to the negative pressure device through the threaded interface 131 on the connecting seat 13.

As shown in Figure 2, the extraction needle II is a hollow structure with a smooth inner wall, including a needle tip 11, a needle tube 12 and a connecting seat 13 connected in sequence. The needle tip is closed, the needle tip 11 is a gentle arc shape, and the end of the needle tube 12 connected to the needle tip 11 is provided with three pinholes 121 distributed along a spiral, and the distance between adjacent pinholes 121 is 2mm. The pinhole 121 is elliptical, and the aperture is the same as 2mm×3mm. The needle tube 12 of the extraction needle is bent in a V shape at one end close to the connecting seat 13, with a bending angle of 120°, and the distance between the bending point 122 and the connecting seat 13 is 1/6 of the length of the needle tube 12. The extraction needle II can be connected to the negative pressure device through the threaded interface 131 on the connecting seat 13.

As shown in FIG3 , the filling needle is a hollow structure with a smooth inner wall and no obvious bends, and includes a needle tip 21, a needle tube 22, and a connection seat 23 connected in sequence. The needle tip 21 is in a gentle arc shape, and a needle hole 221 is provided at one end of the needle tube 22 connected to the needle tip 21, and the distance between the needle tip 21 and the needle hole 221 is 2 mm. The inner diameter of the needle tube 22 is 1.2 mm, and the needle hole 221 is elliptical with an aperture of 1.2 mm×1.3 mm. The filling needle can be connected to the push injection device through a threaded interface 231 on the connection seat 23.

Example 2

A needle combination for fat surgery comprises an extraction needle I, an extraction needle II and a filling needle.

The extraction needle I is a hollow structure with a smooth inner wall and no obvious bends, and includes a needle tip 11, a needle tube 12 and a connection seat 13 connected in sequence. The needle tip 11 is a closed cone, and the end of the needle tube 12 connected to the needle tip 11 is provided with three needle holes 121 distributed along a spiral shape, and the distance between adjacent needle holes 121 is 2mm. The needle hole 121 is elliptical, and the aperture is the same as 2mm×3mm. The extraction needle I can be connected to the negative pressure device through the threaded interface 131 on the connection seat 13.

The extraction needle II is a hollow structure with a smooth inner wall, including a needle tip 11, a needle tube 12 and a connecting seat 13 connected in sequence. The needle tip is closed, the needle tip 11 is a gentle arc shape, and the end of the needle tube 12 connected to the needle tip 11 is provided with three needle holes 121 distributed along a spiral shape, and the distance between adjacent needle holes 121 is 2mm. The needle hole 121 is elliptical, and along the spiral direction from the needle tip 11 to the connecting seat 13, the aperture of the needle hole 121 is 2mm×2.5mm, 2mm×3mm and 2mm×3.5mm from large to small. The needle tube 12 of the extraction needle is V-shaped and bent at one end close to the connecting seat 13, with a bending angle of 120°, and the distance between the bending point 122 and the connecting seat 13 is 1/6 of the length of the needle tube 12. The extraction needle II can be connected to the negative pressure device through the threaded interface 131 on the connecting seat 13.

The filling needle is a hollow structure with a smooth inner wall and no obvious bends, and includes a needle tip 21, a needle tube 22 and a connecting seat 23 connected in sequence. The needle tip 21 is in a gentle arc shape, and a needle hole 221 is provided at one end of the needle tube 22 connected to the needle tip 21, and the distance between the needle tip 21 and the needle hole 221 is 2 mm. The inner diameter of the needle tube 22 is 1.2 mm, and the needle hole 221 is circular with a hole diameter of 1.2 mm. The filling needle can be connected to the push injection device through a threaded interface 231 on the connecting seat 23.

Example 3

A needle combination for fat surgery comprises an extraction needle I and a filling needle.

The extraction needle I is a hollow structure with a smooth inner wall and no obvious bends, and includes a needle tip 11, a needle tube 12, and a connecting seat 13 connected in sequence. The needle tip 11 is a closed cone, and the end of the needle tube 12 connected to the needle tip 11 is provided with three needle holes 121 distributed along a spiral shape, and the distance between adjacent needle holes 121 is 2mm. The needle hole 121 is circular, and along the spiral direction from the needle tip 11 to the connecting seat 13, the aperture of the needle hole 121 is 2mm×2mm, 2.5mm×2.5mm, and 3mm×3mm from large to small. The extraction needle I can be connected to the negative pressure device through the threaded interface 131 on the connecting seat 13.

The filling needle is a hollow structure with a smooth inner wall and no obvious bends, and includes a needle tip 21, a needle tube 22 and a connecting seat 23 connected in sequence. The needle tip 21 is in a gentle arc shape, and a needle hole 221 is provided at one end of the needle tube 22 connected to the needle tip 21, and the distance between the needle tip 21 and the needle hole 221 is 2 mm. The inner diameter of the needle tube 22 is 1.2 mm, and the needle hole 221 is elliptical with an aperture of 1.2 mm×1.3 mm. The filling needle can be connected to the push injection device through a threaded interface 231 on the connecting seat 23.

Example 4

A needle combination for fat surgery comprises an extraction needle I and a filling needle.

The extraction needle I is a hollow structure with a smooth inner wall, including a needle tip 11, a needle tube 12 and a connecting seat 13 connected in sequence. The needle tip is closed, and the needle tip 11 is in a gentle arc shape. The end of the needle tube 12 connected to the needle tip 11 is provided with three needle holes 121 distributed along a spiral, and the distance between adjacent needle holes 121 is 2 mm. The needle hole 121 is elliptical, and the aperture is the same as 2mm×3mm. The needle tube 12 of the extraction needle is bent in a V shape at one end close to the connecting seat 13, with a bending angle of 120°, and the distance between the bending point 122 and the connecting seat 13 is 1/6 of the length of the needle tube 12. The extraction needle I can be connected to the negative pressure device through the threaded interface 131 on the connecting seat 13.

The filling needle is a hollow structure with a smooth inner wall and no obvious bends, and includes a needle tip 21, a needle tube 22 and a connecting seat 23 connected in sequence. The needle tip 21 is in a gentle arc shape, and a needle hole 221 is provided at one end of the needle tube 22 connected to the needle tip 21, and the distance between the needle tip 21 and the needle hole 221 is 2 mm. The inner diameter of the needle tube 22 is 1.2 mm, and the needle hole 221 is elliptical with an aperture of 1.2 mm×1.3 mm. The filling needle can be connected to the push injection device through a threaded interface 231 on the connecting seat 23.

The present invention is described in detail above in conjunction with specific embodiments and/or exemplary examples and drawings, but these descriptions cannot be understood as limiting the present invention. Those skilled in the art understand that, without departing from the spirit and scope of the present invention, various equivalent substitutions, modifications or improvements may be made to the technical solution of the present invention and its implementation methods, all of which fall within the scope of the present invention. The scope of protection of the present invention shall be subject to the attached claims.

Claims (3)

1. A fat surgical needle assembly, characterized in that the fat surgical needle assembly comprises an extraction needle and a filling needle, wherein,

The extraction needle comprises a needle point (11), a needle tube (12) and a connecting seat (13) which are connected in sequence, wherein the needle point (11) is used for guiding the needle tube (12) to move; the needle tube (12) is used for transmitting the extracted fat cells, and one end of the needle tube connected with the needle point (11) is provided with a plurality of needle holes (121) distributed along a spiral shape; the connecting seat (13) is used for connecting the needle tube (12) with the negative pressure device;

The apertures of the needle holes (121) are different, and the aperture of the needle holes (121) is from large to small in the spiral direction from the needle tip (11) to the connecting seat (13); sequentially 2mm×3.5mm, 2mm×3mm and 2mm×2.5mm;

The number of the extraction needle holes (121) is 3;

a set distance is arranged between two adjacent needle holes (121) of the extraction needle along the axial direction of the needle tube, and the set distance is 2mm;

One end of the needle tube (12) of the extraction needle, which is close to the connecting seat (13), is bent in a V shape, the bending angle is 120 degrees,

The distance between the bending point (122) and the connecting seat (13) is 1/6 of the length of the needle tube (12);

The filling needle comprises a needle point (21), a needle tube (22) and a connecting seat (23) which are sequentially connected, wherein the needle point (21) is in a gentle arc shape and is used for guiding the needle tube (22) to move; -said needle cannula (22) is used for transporting fat cells to be filled; the connecting seat (23) is used for connecting the needle tube (22) with the injection device;

One end of the needle tube (22) of the filling needle, which is connected with the needle point (21), is provided with needle holes (221), and the number of the needle holes (221) is 1-2; and/or

The distance between the needle point (21) of the filling needle and the adjacent needle hole (221) is 2 mm-3 mm;

the inner diameter of a needle tube (22) of the filling needle is 1 mm-1.3 mm; and/or

The needle hole (221) of the filling needle is round or elliptic, the aperture is 1.2 mm-1.3 mm when the needle hole (221) is round, and the aperture is 1.2mm multiplied by 1.3mm when the needle hole (221) is elliptic.

2. A surgical needle assembly according to claim 1, wherein,

The extraction needle is of a hollow structure with a smooth inner wall; and/or

The filling needle is of a hollow structure with a smooth inner wall.

3. Surgical needle combination according to one of claims 1 to 2, characterized in that the tail of the connection seat (13) of the extraction needle is engaged with a negative pressure device, the engagement being a threaded interface (131); and/or

The tail part of the connecting seat (23) of the filling needle is connected with the pushing injection device, and a threaded interface (231) is arranged at the connection part.