Syringe capable of adjusting needle depth and use method thereof

Abstract

The invention relates to the field of medical instruments, and discloses an injector capable of adjusting the depth of a needle head and a using method thereof.The injector comprises a needle cylinder, the top of the needle cylinder is in threaded connection with a needle cylinder sealing cover, a liquid medicine pushing mechanism is arranged in the needle cylinder, a protection assembly is arranged on the needle cylinder sealing cover, and a connecting assembly is arranged on the protection assembly; the needle cylinder sealing cover is connected with a needle head adjusting cabin through a protection assembly and a connecting assembly, a needle head adjusting mechanism is arranged in the needle head adjusting cabin, a needle head is arranged on the needle head adjusting mechanism, and scale marks are arranged on the needle cylinder. The depth of the needle head is adjusted by rotating the knob, the stretching depth of the needle head is accurately controlled, discomfort caused by misoperation is avoided, rapid assembly and disassembly are achieved through the connecting assembly, follow-up inspection is facilitated, the magnetic pole piece fixes the metal protective shell, the needle cylinder is protected, cleaning can be conducted easily during disassembly, different parts are disinfected correspondingly, and the cleaning efficiency is improved. The equipment life is prolonged.

Description

Technical Field

[0001] The invention relates to the field of medical devices, in particular to a syringe with adjustable needle depth and a use method thereof. Background Art

[0002] An adjustable needle depth syringe is a medical device that allows the user to adjust the depth of the needle into the skin or tissue as needed. Currently, some adjustable needle depth syringes adjust the needle depth by rotating or sliding a mechanical device. For example, some syringes allow the length of the needle to be changed by rotating the syringe barrel, so that the needle can be inserted deeper or shallower into the skin. Existing syringes have problems such as poor stability and imprecise adjustment. For applications that require precise depth control, existing mechanical devices may not be precise enough and are prone to wear; in existing syringes, disassembly and assembly often require certain skills and time. For some medical scenarios that require frequent inspection and cleaning, this design is too cumbersome and affects the efficiency of the equipment; for reusable syringes, cleaning and disinfection are factors that must be considered. Parts of different materials are difficult to clean with a unified disinfection method, which invisibly increases the trouble of disinfection. Moreover, the design of some syringes makes the disassembly and cleaning process inconvenient, which may lead to bacterial growth or drug residues, posing a potential threat to the patient's health. Therefore, a syringe with adjustable needle depth is proposed to solve the above problems. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a syringe with adjustable needle depth and a method for using the same, which solves the problems of poor stability, imprecise adjustment, complicated maintenance process for syringes, especially the adjustment part, and difficulty in cleaning and disinfecting reusable syringes due to components made of different materials.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: a syringe with adjustable needle depth, comprising a syringe, a syringe sealing cover is threadedly connected to the top of the syringe, a liquid medicine pushing mechanism is arranged in the syringe, a protection component is arranged on the syringe sealing cover, a connecting component is arranged on the protection component, the syringe sealing cover is connected to a needle adjustment cabin through the protection component and the connecting component, a needle adjustment mechanism is arranged in the needle adjustment cabin, and a needle is arranged on the needle adjustment mechanism; The needle adjustment mechanism includes a threaded rod, which is arranged in the needle adjustment cabin, a knob is arranged on the threaded rod, a turnbuckle is threadedly connected to the threaded rod, a connecting block is arranged on the outer side of the turnbuckle, a mounting platform is arranged on the connecting block, and a limiting component is arranged on the mounting platform.

[0005] Preferably, the limiting assembly includes a plurality of mounting blocks, which are annularly distributed on the inner wall of the needle adjustment cabin, and sliding rods are arranged between the mounting blocks in the same vertical direction. A plurality of sliding blocks are fixedly connected to the outer side of the mounting platform in an annular distribution, and the sliding blocks are slidably connected to the corresponding sliding rods respectively.

[0006] Preferably, the medicine pushing mechanism comprises a sealing pushing ring, which is arranged on the inner wall of the syringe, a pushing rod is arranged on the top of the sealing pushing ring, the pushing rod penetrates the syringe sealing cover, and a handle is arranged on the end of the pushing rod away from the syringe.

[0007] Preferably, the protection component includes a metal protection shell, the syringe sealing cover is provided with a protection groove, the metal protection shell is arranged in the protection groove, and magnetic pole pieces are arranged on the top wall of the protection groove and the metal protection shell.

[0008] Preferably, the syringe is provided with scale lines, and the top wall of the protection groove in the protection component and the magnetic pole piece on the metal protection shell have opposite magnetic properties.

[0009] Preferably, the connecting component includes a connecting pipe, which is arranged on the outer side of the metal protective shell in the protective component, and a plurality of connecting grooves 1 are formed in an annular manner on the connecting pipe, and connecting steel balls are provided in each of the connecting grooves 1. A plurality of connecting grooves 2 are formed in an annular manner on the outer side of the metal protective shell in the protective component, and a quick-release component is provided on the connecting pipe.

[0010] Preferably, the quick-release assembly comprises a connecting sleeve, the connecting sleeve is arranged on the connecting pipe, and a connecting spring is arranged between the connecting sleeve and the connecting pipe.

[0011] Preferably, the needle adjustment cabin is connected to the connecting tube, the needle is arranged at the bottom of the mounting platform, and the knob passes through the outer wall of the needle adjustment cabin.

[0012] Preferably, a connecting copper head 1 is provided at the bottom of the syringe, and a connecting copper head 2 is provided at the top of the mounting platform, and the connecting copper head 1 and the connecting copper head 2 are connected by a connecting pipe.

[0013] The present invention also provides a method for using a syringe with adjustable needle depth, comprising the following steps: S1. According to the patient's treatment needs, take out the corresponding model of syringe and needle, install the needle on the mounting table, then fix the syringe sealing cover to the syringe through threads, and then slide the metal protective shell into the protective groove. The magnetic pole pieces on the protective groove and the metal protective shell have opposite magnetic properties, and the magnetic pole pieces attract each other, so that the metal protective shell is fixed on the syringe sealing cover; S2, connect the copper head 1 and the copper head 2 through a connecting pipe, slide the connecting sleeve on the connecting pipe to compress the connecting spring, then connect the connecting pipe to the metal protective shell, then loosen the connecting sleeve, the compressed connecting spring releases the stored elastic potential energy, so that the connecting sleeve is reset, and the reset connecting sleeve pushes the connecting steel ball from the connecting groove 1 into the connecting groove 2, so that the connecting pipe can be fixed on the metal protective shell, and the needle adjustment cabin can be fixed on the metal protective shell through the connecting pipe; S3. The medical staff presses the handle to discharge the air in the syringe through the push rod and the sealing push ring, then opens the medicine bottle to draw the liquid medicine into the syringe through the needle, handle and push rod, then turns the knob, the knob drives the threaded rod to rotate, the turnbuckle on the threaded rod is driven, the turnbuckle has a tendency to rotate, and transmits the movement tendency to the mounting table through the connecting block, then it is restricted by the slider and the slide rod, so that the turnbuckle cannot rotate, and the generated rotational force makes the turnbuckle move linearly along the thread, driving the mounting table during movement, the slider slides on the slide rod, and the needle connected to the mounting table can be put into the needle adjustment cabin, and the depth of the needle during injection can be adjusted from the beginning; S4. The medical staff uses a sterile cotton ball or disinfectant to clean the injection site. Then the medical staff holds the syringe seal cap, inserts the needle into the skin at the injection site, pushes the handle with the thumb, observes the scale line on the syringe, and pushes the liquid medicine from the syringe to the patient in batches through the push rod and the seal push ring; S5. After the injection is completed, pull out the needle quickly and smoothly, and immediately press the injection site with a sterile cotton ball to prevent bleeding. Observe whether the patient has allergic reactions or adverse reactions, and provide appropriate care or follow-up treatment as needed. Then separate the syringe and needle through the connecting sleeve, magnetic pole piece and syringe sealing cover, so that during subsequent disinfection, parts of different materials can be disinfected in different ways, thereby extending the service life of the reusable syringe.

[0014] The present invention provides a syringe with adjustable needle depth and a method for using the same. The invention has the following beneficial effects: 1. In the present invention, the medical staff drives the threaded rod to rotate by turning the knob. Under the restriction of the sliding rod and the slider, the mounting platform moves linearly with the screw buckle through the connection of the connecting block, and the needle on the mounting platform can be put into the needle adjustment cabin, so as to achieve the effect of adjusting the injection depth of the needle. In this way, the insertion depth of the needle can be controlled more finely, effectively avoiding discomfort or treatment errors caused by misoperation.

[0015] 2. The present invention uses a sliding connecting sleeve so that the connecting steel ball will not be in the connecting groove two, which will restrict the removal of the connecting tube. By utilizing the elastic potential energy of the connecting spring when sliding the connecting sleeve, the connecting sleeve can be quickly reset when the connecting tube and the metal protective shell are connected, so that the connecting steel ball is pushed from the connecting groove one into the connecting groove two, so that the connecting tube and the needle adjustment cabin can be fixed on the metal protective shell again. By using such a quick-release method, it can be quickly assembled when used by medical staff, and it is convenient to make timely inspections of the needle adjustment mechanism later, avoiding malfunctions of the needle adjustment mechanism and affecting subsequent use.

[0016] 3. The present invention fixes the metal protective shell outside the syringe by means of the attraction between the opposite poles of different magnetic poles in the magnetic pole piece. The syringe of the reusable syringe is usually made of glass. The metal protective shell can effectively protect the syringe. During the subsequent disassembly, it is only necessary to pull off the metal protective shell and unscrew the syringe sealing cover through the thread. Since the metal protective shell is made of metal material, the syringe is usually made of glass, and the syringe sealing cover is usually rubber and plastic, in the subsequent disinfection process, corresponding disinfection measures can be taken for different parts, so that the cleaning after use is more efficient, and the difficulty in cleaning parts of different materials is reduced, thereby extending the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A perspective view of the present invention; Figure 2 It is a schematic diagram of the split structure of the present invention; Figure 3 It is a right side schematic diagram of the present invention; Figure 4 It is a front cross-sectional schematic diagram of the present invention; Figure 5 It is a schematic diagram of the top view of the needle adjustment cabin of the present invention; Figure 6 It is a schematic diagram of the connection assembly of the present invention; Figure 7 for Figure 4 The enlarged view of point A in the middle; Figure 8 for Figure 4 The enlarged view of point B in the middle; Fig. 9 for Figure 6 Enlarged view of point C in the middle.

[0018] Among them, 1. syringe; 2. syringe sealing cover; 3. liquid medicine pushing mechanism; 301. pushing rod; 302. sealing pushing ring; 303. handle; 4. protection component; 401. metal protection shell; 402. magnetic pole piece; 403. protection groove; 5. connection component; 501. connecting pipe; 502. connecting sleeve; 503. connecting spring; 504. connecting groove one; 505. connecting groove two; 506. connecting steel ball; 6. needle adjustment cabin; 7. needle adjustment mechanism; 701. mounting table; 702. mounting block; 703. sliding rod; 704. sliding block; 705. connecting block; 706. screw buckle; 707. threaded rod; 708. knob; 8. needle; 9. connecting copper head one; 10. connecting copper head two; 11. connecting pipe. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Please see attached Figure 1 -Attached Figure 2 The embodiment of the present invention provides a syringe with adjustable needle depth, including a syringe 1, a syringe sealing cover 2 is threadedly connected to the top of the syringe 1, a liquid medicine pushing mechanism 3 is arranged in the syringe 1, and the liquid medicine pushing mechanism 3 includes a sealing pushing ring 302, the sealing pushing ring 302 is arranged on the inner wall of the syringe 1, a pushing rod 301 is arranged on the top of the sealing pushing ring 302, the pushing rod 301 penetrates the syringe sealing cover 2, and a handle 303 is arranged at the end of the pushing rod 301 away from the syringe 1.

[0021] Specifically, the syringe 1 is the main body of the syringe, which is mainly used to temporarily store the medicine liquid. The syringe sealing cover 2 plays the role of sealing the syringe 1 to prevent the medicine liquid from leaking. The handle 303 is for medical staff to operate. The push rod 301 plays a connecting role. The medical staff can control the movement of the sealing push ring 302 through the handle 303 when operating. The sealing push ring 302 is made of high elastic material to ensure a tight seal with the inner wall of the syringe. The sealing push ring 302 can push the medicine liquid. When pushing, the sealing push ring 302 can effectively prevent the medicine liquid from flowing back, and can also generate negative pressure in the extraction process during the injection process to suck the medicine liquid into the syringe 1.

[0022] Please see attached Figure 1 , Attachment Figure 2 , Attachment Figure 3 , Attachment Figure 4 and attached Figure 7A protection component 4 is arranged on the syringe sealing cover 2, and the protection component 4 includes a metal protection shell 401. A protection groove 403 is opened on the syringe sealing cover 2, and the metal protection shell 401 is arranged in the protection groove 403. The inner top wall of the protection groove 403 and the metal protection shell 401 are both provided with magnetic pole pieces 402. Scale lines are arranged on the syringe 1, and the inner top wall of the protection groove 403 in the protection component 4 and the magnetic pole piece 402 on the metal protection shell 401 have opposite magnetism.

[0023] Specifically, in a reusable syringe, the syringe barrel 1 is usually made of glass, and the metal protective shell 401 is used to protect the syringe 1. The protection groove 403 is provided to provide space for the syringe sealing cover 2 to install the magnetic pole piece 402 connected to the metal protective shell 401, and at the same time, it can also limit the lateral movement of the metal protective shell 401. The magnetic pole pieces 402 have opposite magnetic properties, and the metal protective shell 401 can be fixed on the syringe sealing cover 2 by utilizing the principle of magnetic opposites attracting each other.

[0024] Please see attached Figure 1 , Attachment Figure 2 , Attachment Figure 6 and attached Fig. 9 The protection component 4 is provided with a connection component 5, and the connection component 5 includes a connection pipe 501, which is arranged on the outer side of the metal protection shell 401 in the protection component 4, and a plurality of connection grooves 504 are annularly opened on the connection pipe 501, and connection steel balls 506 are arranged in each of the connection grooves 504, and a plurality of connection grooves 505 are annularly opened on the outer side of the metal protection shell 401 in the protection component 4, and a quick release component is arranged on the connection pipe 501; The quick-release assembly includes a connecting sleeve 502 . The connecting sleeve 502 is arranged on the connecting pipe 501 . A connecting spring 503 is arranged between the connecting sleeve 502 and the connecting pipe 501 .

[0025] Specifically, the connecting tube 501 serves as the installation base of the connecting component 5, and the opening of the connecting groove 1 504 provides space for the establishment of the connecting steel ball 506. The connecting steel ball 506 is inserted into the connecting groove 2 505 to achieve the connection and fixation between the connecting tube 501 and the metal protective shell 401. The connecting sleeve 502 provides a point of action for manual disassembly, and the elastic potential energy of the connecting spring 503 can be used to quickly achieve disassembly and assembly.

[0026] Please see attached Figure 1 , Attachment Figure 2 , Attachment Figure 3 , Attachment Figure 4 , Attachment Figure 5 and attached Figure 8The syringe sealing cover 2 is connected to a needle adjustment cabin 6 through a protection component 4 and a connection component 5. A needle adjustment mechanism 7 is arranged in the needle adjustment cabin 6. A needle 8 is arranged on the needle adjustment mechanism 7. The needle adjustment mechanism 7 includes a threaded rod 707. The threaded rod 707 is arranged in the needle adjustment cabin 6. A knob 708 is arranged on the threaded rod 707. The threaded rod 707 is threadedly connected with a screw buckle 706. A connecting block 705 is arranged on the outer side of the screw buckle 706. A mounting platform 701 is arranged on the connecting block 705. A limiting component is arranged on the mounting platform 701; The limiting assembly includes a plurality of mounting blocks 702, which are arranged in an annular distribution on the inner wall of the needle adjustment chamber 6, and a slide bar 703 is arranged between the mounting blocks 702 in the same vertical direction, and a plurality of slide blocks 704 are fixedly connected to the outer side of the mounting platform 701 in an annular distribution, and the slide blocks 704 are respectively slidably connected to the corresponding slide bars 703; The needle adjustment cabin 6 is connected to the connecting tube 501, the needle 8 is arranged at the bottom of the mounting platform 701, the knob 708 passes through the outer wall of the needle adjustment cabin 6, the bottom of the syringe 1 is provided with a connecting copper head 9, and the top of the mounting platform 701 is provided with a connecting copper head 2 10. The connecting copper head 1 9 and the connecting copper head 2 10 are connected by a connecting tube 11.

[0027] Specifically, the needle adjustment cabin 6 provides space for installing the needle adjustment mechanism 7 and accommodating the needle 8. The needle 8 can penetrate the skin or other tissue layers to accurately inject the liquid medicine into the patient's body. The connecting copper head 1 9, the connecting copper head 2 10 and the connecting tube 11 play a connecting role, and can deliver the liquid medicine pushed in the syringe 1 to the needle 8. The mounting platform 701 is a mounting component connecting the copper head 2 10 and the needle 8, and is also a component of the needle adjustment mechanism 7 that can transmit motion to the needle 8. The knob 708 is an operating component for manually adjusting the injection depth of the needle 8. The mounting block 702 provides a basis for the installation and fixation of the slide bar 703. The slider 704 is connected to the mounting platform 701. The slide bar 703 limits the movement trajectory of the slider 704. This limiting effect is transmitted to the turnbuckle 706 through the connecting block 705. The threads of the turnbuckle 706 and the threaded rod 707 are used to drive the threaded rod 707 to rotate when the knob 708 drives the threaded rod 707 to rotate. The rotation tendency of the turnbuckle 706 is limited, thereby realizing the axial movement of the turnbuckle 706 along the thread of the threaded rod 707, thereby realizing the movement of the mounting platform 701 and achieving the effect that the needle 8 can be retracted into the needle adjustment cabin 6.

[0028] The present invention also provides a method for using a syringe with adjustable needle depth, comprising the following steps: S1. According to the patient's treatment needs, take out the corresponding model of syringe 1 and needle 8, install the needle 8 on the mounting platform 701, then fix the syringe sealing cover 2 to the syringe 1 through threads, and then slide the metal protective shell 401 into the protective groove 403. The magnetic pole pieces 402 on the protective groove 403 and the metal protective shell 401 have opposite magnetic properties, and the magnetic pole pieces 402 attract each other, so that the metal protective shell 401 is fixed on the syringe sealing cover 2; S2, connect the connecting copper head 1 9 and the connecting copper head 2 10 through the connecting pipe 11, slide the connecting sleeve 502 on the connecting pipe 501, so that the connecting spring 503 is compressed, then connect the connecting pipe 501 to the metal protective shell 401, then loosen the connecting sleeve 502, and the compressed connecting spring 503 releases the stored elastic potential energy, so that the connecting sleeve 502 is reset, and the reset connecting sleeve 502 pushes the connecting steel ball 506 from the connecting groove 1 504 into the connecting groove 2 505, so that the connecting pipe 501 can be fixed on the metal protective shell 401, and the needle adjustment cabin 6 can be fixed on the metal protective shell 401 through the connecting pipe 501; S3, the medical staff presses the handle 303, and exhausts the air in the syringe 1 through the push rod 301 and the sealing push ring 302, then opens the medicine bottle and draws the medicine liquid into the syringe 1 through the needle 8, the handle 303 and the push rod 301, and then turns the knob 708, the knob 708 drives the threaded rod 707 to rotate, and the screw buckle 706 on the threaded rod 707 is driven, and the screw buckle 706 has a tendency to rotate, and transmits the movement tendency to the mounting platform 701 through the connecting block 705, and then is restricted by the slider 704 and the slide bar 703, so that the screw buckle 706 cannot rotate, and the generated rotational force makes the screw buckle 706 move linearly along the thread, and when moving, it drives the mounting platform 701, the slider 704 slides on the slide bar 703, and the needle 8 connected to the mounting platform 701 can be put into the needle adjustment cabin 6, and the depth of the needle 8 during injection is adjusted from the beginning; S4. The medical staff cleans the injection site with a sterile cotton ball or disinfectant. Then, the medical staff holds the syringe sealing cover 2, inserts the needle 8 into the skin of the injection site, pushes the handle 303 with the thumb, and pushes the liquid medicine from the syringe 1 to the patient in batches through the push rod 301 and the sealing push ring 302 by observing the scale line on the syringe 1. S5. After the injection is completed, the needle 8 is pulled out quickly and smoothly, and a sterile cotton ball is immediately used to press the injection site to prevent bleeding. The patient is observed to see if he has an allergic reaction or adverse reaction, and appropriate care or follow-up treatment is performed as needed. The syringe 1 and the needle 8 are then separated by the connecting sleeve 502, the pole piece 402 and the syringe sealing cover 2, so that during subsequent disinfection, components of different materials can be disinfected in different ways, thereby extending the service life of the reusable syringe.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A syringe with adjustable needle depth, comprising a syringe barrel (1), characterized in that: The top of the syringe (1) is threadedly connected to a syringe sealing cover (2), a liquid medicine pushing mechanism (3) is arranged in the syringe (1), a protection component (4) is arranged on the syringe sealing cover (2), a connecting component (5) is arranged on the protection component (4), the syringe sealing cover (2) is connected to a needle adjustment cabin (6) via the protection component (4) and the connecting component (5), a needle adjustment mechanism (7) is arranged in the needle adjustment cabin (6), and a needle (8) is arranged on the needle adjustment mechanism (7); The needle adjustment mechanism (7) comprises a threaded rod (707), the threaded rod (707) being arranged in the needle adjustment chamber (6), the threaded rod (707) being provided with a knob (708), the threaded rod (707) being threadedly connected with a turnbuckle (706), a connecting block (705) being arranged outside the turnbuckle (706), a mounting platform (701) being arranged on the connecting block (705), and a limiting component being arranged on the mounting platform (701).

2. A syringe with adjustable needle depth according to claim 1, characterized in that: The limiting component comprises a plurality of mounting blocks (702), wherein the plurality of mounting blocks (702) are arranged in an annular manner on the inner wall of the needle adjustment chamber (6), and a sliding rod (703) is arranged between the mounting blocks (702) in the same vertical direction. A plurality of sliding blocks (704) are fixedly connected in an annular manner on the outer side of the mounting platform (701), and the sliding blocks (704) are respectively slidably connected to the corresponding sliding rods (703).

3. A syringe with adjustable needle depth according to claim 1, characterized in that: The liquid medicine pushing mechanism (3) comprises a sealing pushing ring (302), the sealing pushing ring (302) being arranged on the inner wall of the syringe (1), a pushing rod (301) being arranged on the top of the sealing pushing ring (302), the pushing rod (301) penetrating the syringe sealing cover (2), and a handle (303) being arranged on the end of the pushing rod (301) away from the syringe (1).

4. The syringe with adjustable needle depth according to claim 1, characterized in that: The protection component (4) comprises a metal protection shell (401), a protection groove (403) is provided on the syringe sealing cover (2), the metal protection shell (401) is arranged in the protection groove (403), and magnetic pole pieces (402) are provided on the top wall of the protection groove (403) and the metal protection shell (401).

5. The syringe with adjustable needle depth according to claim 1, characterized in that: The syringe (1) is provided with scale lines, and the inner top wall of the protection groove (403) in the protection component (4) and the magnetic pole piece (402) on the metal protection shell (401) have opposite magnetic properties.

6. The syringe with adjustable needle depth according to claim 1, characterized in that: The connection assembly (5) comprises a connection pipe (501), the connection pipe (501) being arranged on the outer side of the metal protective shell (401) in the protection assembly (4), the connection pipe (501) being provided with a plurality of connection grooves 1 (504) in an annular manner, each of the connection grooves 1 (504) being provided with a connection steel ball (506), the outer side of the metal protective shell (401) in the protection assembly (4) being provided with a plurality of connection grooves 2 (505) in an annular manner, and a quick-release assembly being provided on the connection pipe (501).

7. A syringe with adjustable needle depth according to claim 6, characterized in that: The quick-release assembly comprises a connecting sleeve (502), wherein the connecting sleeve (502) is arranged on the connecting tube (501), and a connecting spring (503) is arranged between the connecting sleeve (502) and the connecting tube (501).

8. The syringe with adjustable needle depth according to claim 1, characterized in that: The needle adjustment chamber (6) is connected to the connecting tube (501), the needle (8) is arranged at the bottom of the mounting platform (701), and the knob (708) passes through the outer wall of the needle adjustment chamber (6).

9. The syringe with adjustable needle depth according to claim 1, characterized in that: A connecting copper head 1 (9) is provided at the bottom of the syringe (1), and a connecting copper head 2 (10) is provided at the top of the mounting platform (701); the connecting copper head 1 (9) and the connecting copper head 2 (10) are connected via a connecting pipe (11).

10. A method for using a syringe with adjustable needle depth, according to the syringe with adjustable needle depth according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. According to the treatment needs of the patient, take out the syringe (1) and the needle (8) of the corresponding model, install the needle (8) on the mounting platform (701), then fix the syringe sealing cover (2) to the syringe (1) by means of threads, and then slide the metal protective shell (401) into the protective groove (403). The magnetic pole pieces (402) on the protective groove (403) and the metal protective shell (401) have opposite magnetic properties, and the magnetic pole pieces (402) attract each other, so that the metal protective shell (401) is fixed on the syringe sealing cover (2); S2, connecting the connecting copper head 1 (9) and the connecting copper head 2 (10) via the connecting tube (11), sliding the connecting sleeve (502) on the connecting tube (501) to compress the connecting spring (503), then connecting the connecting tube (501) to the metal protective shell (401), then loosening the connecting sleeve (502), and the compressed connecting spring (503) releases the stored elastic potential energy, so that the connecting sleeve (502) is reset, and the reset connecting sleeve (502) pushes the connecting steel ball (506) from the connecting groove 1 (504) into the connecting groove 2 (505), so that the connecting tube (501) can be fixed on the metal protective shell (401), and the needle adjustment chamber (6) can be fixed on the metal protective shell (401) through the connecting tube (501); S3. The medical staff presses the handle (303) to discharge the air in the syringe (1) through the push rod (301) and the sealing push ring (302), then opens the medicine bottle to draw the medicine liquid into the syringe (1) through the needle (8), the handle (303) and the push rod (301), and then turns the knob (708). The knob (708) drives the threaded rod (707) to rotate, and the screw buckle (706) on the threaded rod (707) is driven, and the screw buckle (706) tends to rotate. The connecting block (705) transmits the movement trend to the mounting platform (701), which is then restricted by the slider (704) and the slide bar (703), so that the turnbuckle (706) cannot rotate, and the generated rotational force causes the turnbuckle (706) to move linearly along the thread, driving the mounting platform (701) when moving, and the slider (704) slides on the slide bar (703), so that the needle (8) connected to the mounting platform (701) can be stored in the needle adjustment chamber (6), and the depth of the needle (8) during injection can be adjusted from the beginning; S4. The medical staff cleans the injection site with a sterile cotton ball or a sterile solution, then holds the syringe sealing cover (2), inserts the needle (8) into the skin at the injection site, pushes the handle (303) with the thumb, and pushes the liquid medicine from the syringe (1) to the patient in batches through the push rod (301) and the sealing push ring (302) by observing the scale line on the syringe (1); S5. After the injection is completed, the needle (8) is pulled out quickly and smoothly, and a sterile cotton ball is immediately used to press the injection site to prevent bleeding. The patient is observed to see if there is an allergic reaction or adverse reaction, and appropriate care or follow-up treatment is performed as needed. The syringe (1) and the needle (8) are then separated by the connecting sleeve (502), the magnetic pole piece (402) and the syringe sealing cover (2), so that during subsequent disinfection, components of different materials can be disinfected in different ways, thereby extending the service life of the reusable syringe.

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