Remaining needle and injector

Abstract

The invention relates to the technical field of indwelling needles, in particular to an indwelling needle, an injector and a propelling assembly, comprising a rubber head with an internal cavity, a soft rubber pad arranged at one end of the rubber head, an indwelling tube arranged at the other end of the rubber head far away from the soft rubber pad, and a first elastic piece connected with the rubber head; the inside and outside of the rubber head are communicated through a first through hole; the pressure intensity of gas in the rubber head is changed while the indwelling tube is pushed through the spring, it is guaranteed that the indwelling tube is separated from the needle head, meanwhile, whether equipment leaks or not can be verified, and it is guaranteed that in the using process of the indwelling tube, the situations that infusion stops, and the indwelling tube cannot be used due to the fact that gas exists in the indwelling tube are avoided.

Description

Technical Field

[0001] This invention relates to the field of indwelling needle technology, and in particular to an indwelling needle and syringe. Background Technology

[0002] An indwelling catheter is an infusion tool used for intravenous infusion. Its main function is to facilitate intermittent, continuous, or daily intravenous infusion therapy. An indwelling catheter is left in a blood vessel; this procedure is called catheter insertion. During insertion, a plastic catheter, along with a metal needle core, pierces the skin and enters the blood vessel. After confirming the passage is clear, simply hold the catheter with one hand and grasp the needle holder at the rear end of the metal needle core with the other. A gentle pull will remove the metal needle core from the plastic catheter, leaving the catheter with its connector in the blood vessel. As long as the parts outside the blood vessel, such as the connector and extension tube, are secured and there is no abnormal redness or swelling at the insertion site, the indwelling catheter is properly inserted. Intravenous infusion can then be administered through the connector remaining outside the catheter. The main reason for using indwelling catheters is to avoid repeated needle pricks. They are easy to operate, suitable for most puncture sites, and are a preferred method for clinical infusion during prolonged or intermittent infusions.

[0003] In actual use, the sealing performance of indwelling needles cannot be verified. During use, it was found that poor sealing can cause air to be trapped inside, leading to infusion stagnation and even patient discomfort. Furthermore, indwelling needles cannot be inserted precisely and can only be observed with the naked eye. At the same time, the existing indwelling needles are also relatively cumbersome to operate, as the indwelling needle is often pulled out along with the needle when it is pushed, which is very unfriendly to novice nurses. Summary of the Invention

[0004] In this section, as well as in the abstract and title of this application, some simplifications or omissions may be made to avoid obscuring the purpose of this section, the abstract, and the title of this application, and such simplifications or omissions shall not be used to limit the scope of the invention.

[0005] In view of the problems existing in the above or prior art, the present invention is proposed.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an indwelling needle, which includes an infeeding assembly, including a rubber head with an internal cavity, a soft rubber pad disposed at one end of the rubber head, an indwelling tube disposed at the other end of the rubber head away from the soft rubber pad, and a first elastic member connected to the rubber head. The inside and outside of the rubber head are connected by the first through hole; and the first through hole has a built-in one-way valve that can flow outward.

[0007] As a preferred embodiment of the indwelling needle of the present invention, one end of the rubber head is provided with a receiving groove for installing a soft rubber pad; The outer wall of the rubber head is provided with a first movable channel for the indwelling tube to slide, and the first movable channel is connected to the inside of the rubber head.

[0008] As a preferred embodiment of the indwelling needle of the present invention, the rubber head includes a first inclined surface.

[0009] As a preferred embodiment of the indwelling needle of the present invention, a clamping element is externally connected to the rubber head; One end of the rubber head is provided with a threaded cylinder. The inner radius of the threaded cylinder is the same as that of the first movable channel, and the outer surface of the threaded cylinder is provided with threads. The clamping part is sleeved on the outside of the threaded cylinder.

[0010] As a preferred embodiment of the indwelling needle of the present invention, the outer wall of the threaded cylinder is provided with a second movable channel that can communicate with the interior, and a ball head is slidably provided inside the second movable channel; The inner wall of the clamping component is provided with a second inclined surface.

[0011] As a preferred embodiment of the indwelling needle of the present invention, the outer surface of the indwelling tube away from the rubber head is provided with a buffer surface.

[0012] As a preferred embodiment of the indwelling needle of the present invention, the inner wall of the indwelling tube is provided with a third inclined surface, and the inner diameter of the indwelling tube gradually decreases from one end near the rubber head to the other end.

[0013] The present invention also provides a syringe, wherein: a syringe barrel, a plunger disposed inside the syringe barrel, and a needle disposed on the outer wall of the syringe barrel.

[0014] In a preferred embodiment of the syringe of the present invention, an abutment block is provided on the outer wall of the syringe barrel.

[0015] In a preferred embodiment of the syringe of the present invention, a third through hole is provided on the outer wall of the needle.

[0016] The beneficial effects of this invention are as follows: This invention changes the gas pressure inside the syringe head while the indwelling tube is pushed by the spring. This ensures that the indwelling tube is separated from the needle and verifies whether there is any leakage in the equipment. It also ensures that the indwelling tube will not stop infusion or become unusable due to gas inside during use. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 A three-dimensional view of the indwelling needle Figure 2Diagram showing the connection between the indwelling needle and the needle tip. Figure 3 This is a three-dimensional view of the indwelling needle.

[0018] Figure 4 This is a cross-sectional schematic diagram of the push assembly structure for the indwelling needle.

[0019] Figure 5 for Figure 4 Enlarged schematic diagram of the structure of region A in the middle.

[0020] Figure 6 This is a schematic diagram showing the connection between the indwelling catheter and the needle.

[0021] Figure 7 This is a schematic diagram of the third inclined surface of the inner wall of the indwelling tube.

[0022] Figure 8 This is a schematic diagram of a threaded cylinder with a gap.

[0023] Figure 9 This is a schematic diagram of the second inclined surface of the inner wall of the clamping component.

[0024] Figure 10 This is a schematic diagram of a syringe.

[0025] Figure 11 for Figure 10 Enlarged schematic diagram of the structure of region B in the middle.

[0026] Reference numerals: 100, propulsion assembly; 101, rubber head; 101a, first through hole; 101b, receiving groove; 101c, first movable channel; 101d, first inclined surface; 102, soft rubber pad; 103, indwelling tube; 103a, buffer surface; 103b, third inclined surface; 104, first elastic element; 105, clamping element; 105a, second inclined surface; 106, threaded cylinder; 106a, second movable channel; 107, ball head; 201, injection cylinder; 201a, contact block; 202, push rod; 203, needle; 203a, third through hole. Detailed Implementation

[0027] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0028] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0029] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single embodiment or an embodiment selectively excluded from other embodiments. Example 1

[0030] Reference Figures 1-2 This is the first embodiment of the present invention. This embodiment provides an indwelling needle, which includes an advance assembly 100, including a rubber head 101 with an internal cavity, a soft rubber pad 102 disposed at one end of the rubber head 101, an indwelling tube 103 disposed at the other end of the rubber head 101 away from the soft rubber pad 102, and a first elastic member 104 connected to the rubber head 101. The inner and outer parts of the rubber head 101 are connected by the first through hole 101a.

[0031] The left end of the rubber head 101 is fixedly connected to a soft rubber pad 102, which serves as a sealing piston for the medical infusion bottle and can be made of rubber. Its function is to ensure that even after the needle passes through and is withdrawn, the soft rubber pad 102 still provides a seal. An indwelling catheter 103 is slidably connected to the right side of the rubber head 101. The indwelling catheter 103 is made of a deformable material. A first elastic element 104 is positioned between the rubber head 101 and the needle; in this design, the first elastic element 104 is a compression spring. Figure 2 As shown, the needle is a push-type design, which is existing technology and will not be described in detail further; simultaneously, the first elastic element 104 is fixed to the outer surface of the rubber head 101; the needle passes through the soft rubber pad 102 and simultaneously begins to compress the first elastic element 104; a through hole is punched through the outer surface of the rubber head 101, that is, the first through hole 101a extends along the outer surface of the rubber head 101 to the cavity inside the rubber head 101, as shown. Figure 2 As shown, this first through hole 101a can be sealed with a piston cap or similar device, which is existing technology and will not be described further.

[0032] It should be noted that the indwelling tube 103 is fixedly connected to the glue head 101 in this scheme.

[0033] When in use, the needle passes through the soft rubber pad 102, that is, the indwelling tube 103 is sleeved on the outer surface of the needle. Then, the needle is inserted into the position where the patient needs to insert the tube. At this time, one hand can hold one end of the needle and two fingers can pull the rubber head 101 backward to squeeze the first elastic element 104. After the needle enters the patient's blood vessel, release the two fingers. The first elastic element 104 releases potential energy and pushes the indwelling tube 103 into the blood vessel. Example 2

[0034] Reference Figures 3-5This is the second embodiment of the present invention, which provides an indwelling needle, except that the head 101 is improved; it includes a push assembly 100, which includes a head 101 with an internal cavity, a soft rubber pad 102 disposed at one end of the head 101, an indwelling tube 103 disposed at the other end of the head 101 away from the soft rubber pad 102, and a first elastic member 104 connected to the head 101; The inside and outside of the rubber head 101 are connected by the first through hole 101a; and the first through hole 101a has a built-in one-way valve that can flow outward.

[0035] Among them, such as Figure 4 As shown, a soft rubber pad 102 is fixedly connected to the left end of the rubber head 101. This soft rubber pad 102 is a sealing piston for medical infusion bottles, and its material can be rubber. Its function is that even after the syringe needle passes through the soft rubber pad 102 and is then pulled out, the soft rubber pad 102 can still achieve a seal. An indwelling tube 103 is slidably connected to the right side of the rubber head 101. The indwelling tube 103 is made of a deformable material. A first elastic element 104 is set in the cavity of the rubber head 101. In this design, the first elastic element 104 is a compression spring. At the same time, a through hole is drilled through the outer surface of the rubber head 101, that is, the first through hole 101a extends along the outer surface of the rubber head 101 to the cavity inside the rubber head 101. A one-way valve is installed on the inner wall of the first through hole 101a. The one-way valve allows flow from the inside of the rubber head 101 to the outside of the rubber head.

[0036] Working principle, such as Figure 3 As shown, using existing technology, a needle passes through the soft rubber pad 102, then through the rubber head 101, extending to the side of the rubber head 101 away from the soft rubber pad 102. Then, an indwelling tube 103 is fitted over the surface of the needle and inserted into the rubber head 101, abutting against one end of the first elastic member 104. At this point, the indwelling tube 103 is in contact with the needle. The needle is used to insert the indwelling tube 103 into the human body. During the process of the needle driving the indwelling tube 103 into the human body, the indwelling tube 103 will abut against the first elastic member 104. Subsequently, the compressed first elastic member 104 reacts to the indwelling tube 103. This allows the indwelling tube 103 to have a certain buffering effect during insertion. Then, the indwelling tube 103 is fixed by hand or tape, and the needle is pulled outward. Then, the soft rubber pad 102 closes, and the end of the rubber head 101 away from the indwelling tube 103 is closed and sealed. Then, the rubber head 101 is squeezed by hand, and the internal gas is vented outward through the first through hole 101a. The internal cavity of the rubber head 101 forms a negative pressure, and human blood flows along the indwelling tube 103 into the cavity of the rubber head 101. If the seal is not good, the blood will not flow, or it will not flow outward along the indwelling tube 103, then the device cannot be used. Example 3

[0037] Reference Figures 3-7This is the third embodiment of the present invention, which differs from other embodiments in that: one end of the rubber head 101 is provided with a receiving groove 101b for installing the soft rubber pad 102; The outer wall of the rubber head 101 is provided with a first movable channel 101c for the indwelling tube 103 to slide, and the first movable channel 101c is connected to the inside of the rubber head 101.

[0038] In this design, the end of the rubber head 101 away from the indwelling tube 103 has an indented surface forming a receiving groove 101b, and the radius of the receiving groove 101b is larger than the cross-sectional area of ​​the cavity inside the rubber head 101. The advantage of this design is that the soft rubber pad 102 does not need to be completely fitted to the inner wall of the receiving groove 101b. It is sufficient that the cross-section of the soft rubber pad 102 is larger than the cross-section of the cavity. Then, the soft rubber pad 102 can be fixed inside the receiving groove 101b.

[0039] The first movable channel 101c can connect the internal cavity of the rubber head 101 with the outside, and the first movable channel 101c provides a sliding channel for the indwelling tube 103. The advantage of this design is that the indwelling tube 103 can be installed inside the first movable channel 101c by friction. The operator can hold the rubber head 101 and the indwelling tube 103 with one hand, and use the other hand to pass the needle through the soft rubber pad 102, then through the inside of the rubber head 101, and into the inside of the indwelling tube 103.

[0040] The rubber head 101 includes a first inclined surface 101d.

[0041] like Figure 4 As shown, a first inclined surface 101d is provided on the side of the rubber head 101 near the indwelling tube 103. The advantage of this design is that after the indwelling tube 103 is inserted into the human body, medical staff can use their hands to clamp the surface of the first inclined surface 101d and their thumbs can press the rubber head 101, making it more convenient to operate.

[0042] In summary, the indwelling catheter 103 is inserted into the body using a needle. Then, the rubber head 101 is pressed by hand to verify whether the rubber head 101 and the indwelling catheter 103 are sealed or whether the rubber head is sealed. At the same time, this method can also be used to expel the air inside the rubber head 101. If infusion is needed, the needle is directly inserted into the rubber head 101, and then the infusion can continue. Example 4

[0043] Reference Figures 3-7 This is the third embodiment of the present invention, which differs from the previous two embodiments in that: the rubber head 101 is externally connected to a clamping member 105; One end of the rubber head 101 is provided with a threaded cylinder 106. The inner radius of the threaded cylinder 106 is the same as that of the first movable channel 101c, and the outer surface of the threaded cylinder 106 is provided with threads. The clamping member 105 is sleeved on the outside of the threaded cylinder 106.

[0044] A threaded cylinder 106 is fixedly installed at the end of the rubber head 101 away from the soft rubber pad 102, and the outer surface of the threaded cylinder 106 has a thread; a clamping member 105 is installed on the outer surface of the threaded section, and the inner wall of the clamping member 105 is provided with a thread that matches the thread on the outer wall of the threaded cylinder 106; that is, the clamping member 105 is screwed to the threaded cylinder 106; the pressure between the indwelling tube 103 and the needle tube can be increased by rotating the clamping member 105, thereby increasing the friction; such as Figure 8 As shown, several gaps can be set in the threaded cylinder 106 to allow the threaded cylinder 106 to contract, similar to the principle of an expansion bolt.

[0045] Preferably, the outer wall of the threaded cylinder 106 is provided with a second movable channel 106a that can communicate with the interior, and a ball head 107 is slidably provided inside the second movable channel 106a.

[0046] The inner wall of the clamping member 105 is provided with a second inclined surface 105a.

[0047] To improve the service life of the clamping part 105, the second movable channel 106a is provided at the threaded section on the outer surface of the threaded cylinder 106. At the same time, a ball head 107 is slidably provided inside the second movable channel 106a, and the cross-sectional area of ​​the opening at the upper and lower ends of the second movable channel 106a is smaller than the cross-sectional area of ​​the ball head 107, so as to prevent the ball head 107 from sliding out of the second movable channel 106a.

[0048] like Figure 9 As shown, the radius of the clamping member 105 decreases continuously from right to left, forming a second inclined surface 105a. When the clamping member 105 is rotated, the ball head 107 rolls along the second inclined surface 105a. Then the ball head 107 begins to move continuously inward, thereby squeezing the indwelling tube 103.

[0049] Furthermore, the outer surface of the indwelling tube 103 away from the end of the tube head 101 is provided with a buffer surface 103a.

[0050] To ensure smooth insertion of the indwelling catheter 103 into the body, a buffer surface 103a is made at the end of the indwelling catheter 103 near the needle, that is, the outer diameter of the indwelling catheter 103 gradually decreases towards the needle, making it easier to insert into the human body.

[0051] Preferably, the inner wall of the indwelling tube 103 is provided with a third inclined surface 103b, and the inner diameter of the indwelling tube 103 gradually decreases from one end near the glue head 101 to the other end.

[0052] The indwelling tube 103 has a third inclined surface 103b on its inner wall, meaning that the inner diameter of the indwelling tube 103 gradually decreases from one end near the head 101 to the other end. The advantage of this design is that the needle in the prior art will have a gradual fitting process when it enters the indwelling needle 103, which makes it easier for the needle to be inserted into the indwelling tube 103.

[0053] Furthermore, graduation lines can be provided on the surface of the indwelling tube 103.

[0054] In summary, during use, the existing needle is inserted through the soft rubber pad 102 and then into the indwelling tube 103. After the needle passes through the indwelling tube 103, it can be manually pushed. The distance the indwelling tube 103 moves inward is used to determine the distance to squeeze the first elastic element 104. Then, the locking element 105 is rotated, and the ball head 107 is pressed against the outer surface of the indwelling tube 103, thereby restricting the sliding of the indwelling tube 103. Then, the existing needle is used to insert the indwelling tube 103 into the human body. When the locking component 105 is activated, the first elastic element 104 inside the rubber head 101 begins to release potential energy, pushing the indwelling tube 103 a certain distance into the body. At the same time, it contacts the restriction between the indwelling tube 103 and the needle. During this process, the indwelling tube 103 will extend beyond the needle. Then, medical staff can gently press the part of the indwelling tube 103 that extends beyond the needle and then withdraw the needle. Before use, the rubber head 101 can be squeezed continuously. If blood flows out, the seal is intact. At the same time, the internal air can be vented out, which is convenient for subsequent use. Example 5

[0055] Reference Figures 3-11 This is the fourth embodiment of the present invention, which differs from the previous three embodiments in that: the syringe 201, the push rod 202 disposed inside the syringe 201, and the needle 203 disposed on the outer wall of the syringe 201.

[0056] The push rod 202 has a piston at one end near the inside of the syringe 201 to ensure that no liquid or gas passes through during the sliding process of the push rod 202 and the syringe 201; the needle 203 is located at the end of the syringe 201 away from the push rod 202 and is connected to the inside of the syringe 201.

[0057] The outer wall of the syringe 201 is provided with an abutment block 201a.

[0058] The contact block 201a is located at one end of the syringe 201 near the needle 203, and the contact block 201a surrounds the needle 203. The advantage of this design is that when the rubber head 101 in the push assembly 100 contacts the contact block 201a, the contact block 201a will contact the soft rubber pad 102. The two can be squeezed appropriately, and the operator can push the rubber head 101 with appropriate force without hard contact. That is, the rubber head 101 will not directly contact the syringe 201, and the soft rubber pad 102 will have a certain buffering effect.

[0059] The outer wall of the needle 203 is provided with a third through hole 203a.

[0060] The outer wall of the needle 203 is provided with a third through hole 203a, which connects the inside of the needle 203 with the inside of the rubber head 101. The advantage of this design is that when the indwelling tube 103 is inserted into the human body, the needle 203 is withdrawn; then the clamping member 105 is rotated, and the ball head 107 squeezes and closes the indwelling tube 103; then physiological saline or disinfectant is drawn into the syringe 201, and then the third through hole 203a on the outer wall of the needle 203 is pushed to the position of the cavity of the rubber head 101, and the push rod 202 is pushed to inject the disinfectant liquid into the cavity of the rubber head 101, thereby expelling the internal air or liquid and ensuring that the indwelling tube 103 is clean and hygienic.

[0061] One more point needs to be explained about this solution: when the indwelling catheter 103 is pushed into the human body through the needle 203, the clamping member 105 is rotated to release the pressure of the ball head 107 on the indwelling catheter 103. During this process, the first elastic member 104 will push the indwelling catheter 103 into the body. During this process, a certain negative pressure will be formed in the cavity inside the rubber head 101. At this time, blood can be drawn into the cavity through the third through hole 203a. If this phenomenon does not occur, it means that there is a problem with the overall structure sealing.

[0062] Importantly, it should be noted that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (such as variations in installation arrangement, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application. For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of the element may be inverted or otherwise changed, and the nature or number or position of the discrete elements may be altered or changed. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure performing the function described herein, and not only structural equivalents but also equivalent structures. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the invention is not limited to the particular embodiments but extends to a variety of modifications that still fall within the scope of the appended claims.

[0063] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments may be omitted.

[0064] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those of ordinary skill in the art who benefit from this disclosure, the development effort will be a routine task in design, manufacturing, and production without requiring extensive experimentation.

[0065] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An indwelling needle, characterized in that: include, The propulsion assembly (100) includes a rubber head (101) with an internal cavity, a soft rubber pad (102) disposed at one end of the rubber head (101), an indwelling tube (103) disposed at the other end of the rubber head (101) away from the soft rubber pad (102), and a first elastic member (104) connected to the rubber head (101). The rubber head (101) is connected inside and outside by the first through hole (101a).

2. The indwelling needle as described in claim 1, characterized in that: The first through hole (101a) has a built-in one-way valve that allows outward flow; The rubber head (101) has a receiving groove (101b) at one end for installing a soft rubber pad (102). The outer wall of the rubber head (101) is provided with a first movable channel (101c) for the indwelling tube (103) to slide, and the first movable channel (101c) is connected to the inside of the rubber head (101).

3. The indwelling needle as described in claim 2, characterized in that: The rubber head (101) includes a first inclined surface (101d).

4. The indwelling needle as described in claim 3, characterized in that: The rubber head (101) is externally connected to a clamping element (105); One end of the rubber head (101) is provided with a threaded cylinder (106). The inner radius of the threaded cylinder (106) is the same as that of the first movable channel (101c), and the outer surface of the threaded cylinder (106) is provided with threads. The clamping member (105) is sleeved on the outside of the threaded cylinder (106).

5. The indwelling needle as described in claim 1 or 4, characterized in that: The outer wall of the threaded cylinder (106) is provided with a second movable channel (106a) that can communicate with the interior, and a ball head (107) is slidably provided inside the second movable channel (106a). The inner wall of the clamping member (105) is provided with a second inclined surface (105a).

6. The indwelling needle as described in claim 5, characterized in that: The outer surface of the indwelling tube (103) away from the rubber head (101) is provided with a buffer surface (103a).

7. The indwelling needle as described in any one of claims 1 to 4, 6, characterized in that: The inner wall of the indwelling tube (103) is provided with a third inclined surface (103b), and the inner diameter of the indwelling tube (103) gradually decreases from one end near the rubber head (101) to the other end.

8. A syringe, characterized in that: The indwelling needle according to any one of claims 1 to 7 further includes an injection cylinder (201), a push rod (202) disposed inside the injection cylinder (201), and a needle tip (203) disposed on the outer wall of the injection cylinder (201).

9. The syringe as described in claim 8, characterized in that: The outer wall of the injection cylinder (201) is provided with an abutment block (201a).

10. The syringe as claimed in claim 9, characterized in that: The needle (203) has a third through hole (203a) on its outer wall.

Images