CN111939385B

CN111939385B - Syringe for viscous and incompressible fluids

Info

Publication number: CN111939385B
Application number: CN202010832477.1A
Authority: CN
Inventors: 王明军; 黄裕程; 孙杨; 向冬
Original assignee: Lixin Shenzhen Medical Devices Co ltd; Shenzhen Corliber Scientific Co ltd
Current assignee: Lixin Shenzhen Medical Devices Co ltd; Shenzhen Corliber Scientific Co ltd
Priority date: 2020-08-18
Filing date: 2020-08-18
Publication date: 2021-07-30
Anticipated expiration: 2040-08-18
Also published as: CN113304353B; CN113304353A; CN111939385A; CN113304352A; CN113304352B

Abstract

The present disclosure provides an injector for viscous and incompressible fluid, which includes a syringe for containing fluid, a push rod disposed in the syringe and movable along the syringe, a cover covering a nozzle of the syringe, and a needle mounted at one end of the syringe and communicating with the syringe, the cover having a through hole, the push rod having a rod body, a piston disposed at one end of the rod body and located in the syringe, and a grip portion disposed at the rod body, the push rod being movable along an inside of the syringe from a first position of the syringe away from the needle to a second position close to the needle via the through hole; a helical shearing mechanism is disposed within the needle, the barrel having an inner diameter greater than the needle and a transition section between the barrel and the needle having a progressively decreasing inner diameter, wherein when the barrel contains fluid and the ram moves from the first position to the second position of the barrel, fluid is expressed from the needle by the helical shearing device. Therefore, the resistance of the injector during fluid injection can be reduced, and fluid injection can be facilitated.

Description

Syringe for viscous and incompressible fluids

Technical Field

The present disclosure relates specifically to a syringe of viscous and incompressible fluid.

Background

Syringes are a common tool. As early as the 15 th century, kathler, italian, proposed the principle of a syringe, primarily using a needle to draw or inject a gas or liquid. The syringe has wide application fields, and the syringe can be used for medical equipment and containers, such as scientific instruments in some chromatography, and is injected through a rubber diaphragm.

The existing injector is simple in structure and is often used for injecting gas or liquid. When the existing injector injects fluid with larger viscosity, the problem that the fluid is difficult to inject due to larger resistance is usually encountered.

BRIEF SUMMARY OF THE PRESENT DISCLOSURE

The present disclosure has been made in view of the above-described state of the art, and an object thereof is to provide a syringe for viscous and incompressible fluid capable of reducing resistance to facilitate injection of the fluid.

To this end, the present disclosure provides an injector for viscous and incompressible fluids, comprising a barrel for containing a fluid, a push rod disposed within and movable along the barrel, a cover covering a nozzle of the barrel, and a needle mounted at one end of the barrel and communicating with the barrel, the push rod is provided with a rod body, a piston which is arranged at one end of the rod body and is positioned in the needle cylinder, and a holding part which is arranged on the rod body, the cover body is provided with a through hole, the push rod moves from a first position of the needle head far away from the needle head to a second position of the needle head close to the needle head along the inner part of the needle cylinder through the through hole, the periphery of the rod body is provided with a first thread, the inner wall of the through hole is provided with a second thread matched with the first thread, and the piston moves in the needle cylinder by rotating the push rod; a helical shear mechanism is disposed within the needle, the barrel having an inner diameter greater than the needle and a transition section having a gradually decreasing inner diameter formed between the barrel and the needle, wherein when the barrel contains the fluid and the ram moves from the first position to the second position of the barrel, the fluid is forced out of the needle by the helical shear mechanism and the fluid experiences shear forces from the helical shear mechanism as the fluid flows through the helical shear mechanism.

In the present disclosure, a syringe for viscous and incompressible fluids includes a barrel, a ram, a cap, and a needle. The syringe is used for containing fluid; the push rod is arranged in the needle cylinder and can move along the needle cylinder, the push rod is provided with a rod body, a piston which is arranged at one end of the rod body and is positioned in the needle cylinder and a holding part which is arranged on the rod body, and the push rod can move from a first position of the needle cylinder far away from the needle head to a second position close to the needle head along the inner part of the needle cylinder through a through hole of the cover body; the syringe needle is installed in the one end of cylinder and is communicated with the cylinder, is provided with spiral shearing mechanism in the syringe needle, and the internal diameter of cylinder is greater than the internal diameter of syringe needle to be formed with the internal diameter and reduce the changeover portion that reduces gradually between cylinder and syringe needle. When the syringe contains fluid and the ram moves from the first position to the second position of the syringe, fluid is expressed from the needle by the helical shear mechanism. Therefore, the resistance of the injector during fluid injection can be reduced, and fluid injection can be facilitated.

In addition, in the syringe related to the present disclosure, optionally, a scale line is provided on a side of the cylinder adjacent to the needle. In this case, it is possible to facilitate determination of the injection amount of the injector.

In addition, in the syringe according to the present disclosure, optionally, an outer diameter of the piston is not smaller than an inner diameter of the cylinder. In this case, it is possible to ensure that the piston moves in the cylinder and to suppress the fluid from flowing out of the piston at the time of injection.

In addition, in the syringe according to the present disclosure, the cap body may optionally have a groove provided with a thread, and the cap body may be fixed to the cylinder in a screw manner through the groove. This enables the cap to be fixed to the cylinder in a better manner.

In addition, in the injector related to the present disclosure, optionally, the syringe includes a hollow cylinder wall, a connecting portion connected to the needle, and a blocking mechanism disposed on an outer periphery of the hollow cylinder wall and preventing the syringe from following the push rod when the injector performs injection. This can advantageously prevent the syringe from following the ram as it advances.

In the syringe according to the present disclosure, the stopper mechanism may be provided to cooperate with the grip portion, and the stopper mechanism may be a slip-proof strip or a finger grip portion. This can facilitate the operator to better secure the barrel while the injector is injecting.

In addition, in the syringe according to the present disclosure, the connection part may be connected to the needle by screwing so that the inner diameter of the needle is matched to the inner diameter of the connection part. This enables the needle to be fitted better to the barrel.

In addition, in the injector related to the present disclosure, optionally, an inner contour of the transition section is tapered or rounded in a cross section along an axial direction of the cylinder. Whereby the resistance to injection of fluid can be reduced.

In addition, in the syringe according to the present disclosure, the helical cutting mechanism may be a screw extrusion structure or a rotor structure provided on an inner wall of the needle. In this case, the resistance of the fluid inside the needle can be reduced, facilitating a better injection of the fluid.

In addition, in the syringe related to this disclosure, optionally, the internal diameter of syringe needle is 2 ~ 6 mm. Thereby facilitating better injection of fluid by the syringe.

According to the present disclosure, a syringe of viscous and incompressible fluid capable of reducing resistance to facilitate injection of the fluid is provided.

Drawings

Fig. 1 is a perspective view illustrating a syringe for viscous and incompressible fluid according to an embodiment of the present disclosure.

Fig. 2 is an exploded view of a syringe showing a viscous and incompressible fluid according to embodiments of the present disclosure.

Fig. 3 is a cross-sectional view of a syringe illustrating a viscous and incompressible fluid according to embodiments of the present disclosure.

Fig. 4 is a perspective view illustrating the barrel to needle connection in a syringe for viscous and incompressible fluids according to an embodiment of the present disclosure.

Fig. 5 is a perspective view illustrating a cap of a syringe for viscous and incompressible fluid according to an embodiment of the present disclosure.

Fig. 6 is a partial cross-sectional view of a syringe showing a viscous and incompressible fluid at the cap according to embodiments of the present disclosure.

Fig. 7 is a partial cross-sectional view of a syringe showing a viscous and incompressible fluid at the needle according to embodiments of the present disclosure.

Fig. 8 is a perspective view showing a needle according to an embodiment of the present disclosure.

Fig. 9 illustrates a cross-sectional view of fig. 8 according to an embodiment of the present disclosure.

Fig. 10 is a partial sectional view showing a needle according to another embodiment of the present disclosure.

Fig. 11 is a perspective view showing the rotor structure in fig. 10 according to the embodiment of the present disclosure.

Fig. 12 is a partially enlarged view of fig. 11 according to the embodiment of the present disclosure.

Fig. 13(a) and 13(b) are perspective views showing different orientations of unit bodies of a rotor structure according to an embodiment of the present disclosure.

Detailed Description

Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the following description, the same components are denoted by the same reference numerals, and redundant description thereof is omitted. The drawings are schematic and the ratio of the dimensions of the components and the shapes of the components may be different from the actual ones.

It is noted that the terms "comprises," "comprising," and "having," and any variations thereof, in this disclosure, for example, a process, method, system, article, or apparatus that comprises or has a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include or have other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The present disclosure presents a syringe for viscous and incompressible fluids. In the present disclosure, a syringe of viscous and incompressible fluid is capable of reducing the resistance to injection fluid to facilitate fluid injection. The syringe to which the present disclosure relates may be used to extract or inject fluids. In some examples, the fluid may be a fluid having a viscosity. In some examples, the fluid may be an incompressible fluid. For example, the fluid may include, but is not limited to, artificial bone material used in medical procedures. Examples of the present disclosure are not limited thereto, and the syringe of the present disclosure can also be used to extract or inject gas or liquid, etc.

Fig. 1 is a perspective view of a syringe 10 showing a viscous and incompressible fluid according to an embodiment of the present disclosure. Fig. 2 is an exploded view of syringe 10 showing a viscous and incompressible fluid according to embodiments of the present disclosure.

In the present disclosure, an injector 10 for viscous and incompressible fluids to which the present disclosure relates (which may be referred to simply as injector 10) may include a barrel 110, a ram 120, and a needle 130 (see fig. 1 and 2). The syringe may 110 be used to contain a fluid, among other things. The push rod 120 may be disposed within the syringe 110 and movable along the syringe 110. Needle 130 may be mounted at one end of barrel 110 and in communication with barrel 110. The needle 130 may be provided with a helical cutting mechanism 134 (see fig. 7). In this case, the operator can push or rotate the push rod 120 to make the fluid contained in the cylinder 110 flow out from the needle 130 communicating with the cylinder 110 via the helical shear mechanism 134, thereby injecting the fluid, whereby the resistance of the injector in injecting the fluid can be reduced and the injection of the fluid can be facilitated.

In some examples, as described above, the injector 10 may include a syringe 110 (see fig. 1 and 2). In some examples, the syringe 110 may be elongated. For example, the syringe 110 may have a cylindrical shape, a prismatic shape, or other irregular shapes. Preferably, as shown in fig. 1 and 2, the cylinder 110 may have a cylindrical shape.

In some examples, the syringe 110 may be made of plastic or glass. In some examples, the barrel wall of the syringe 110 may be transparent. In this case, the control of the injection amount can be facilitated.

Fig. 3 is a cross-sectional view of syringe 10 illustrating a viscous and incompressible fluid according to embodiments of the present disclosure. In some examples, as shown in fig. 3, the syringe 110 may pass through in the axial direction. That is, the cylinder 110 may have a through hole along the axial direction. In some examples, the through-hole 110a of the syringe 110 may have a circular, square, or other irregular shape. Preferably, the penetration hole 110a of the cylinder 110 may have a circular shape.

In some examples, one end of barrel 110 may be in communication with needle 130 (described later). The other end of the cylinder 110 may be provided with a push rod 120 (described later). In some examples, syringe 110 may be used to contain fluids.

In some examples, as shown in fig. 1 and 3, the syringe 110 may include a hollow barrel wall 112. In some examples, a blocking mechanism 114 may be disposed on the hollow cartridge wall 112. In some examples, the blocking mechanism 114 may be used to prevent the syringe 110 from following the ram 120 as the injector 10 injects. That is, the operator may prevent slippage of the syringe 110 by the blocking mechanism 114 while pushing or rotating the push rod 120. In some examples, the blocking mechanism 114 may be configured to be used in conjunction with a grip 123 (described later). In this case, the operator holds the grip 123 and the blocking mechanism 114 in hand, respectively, while using the syringe 10, thereby enabling the operator to better use the syringe 10.

In some examples, the blocking mechanism 114 may be disposed at an outer periphery of the hollow cartridge wall 112 (see fig. 1). In some examples, blocking mechanism 114 may be disposed on a side of hollow cartridge wall 112 away from needle 130. Examples of the disclosure are not limited thereto and in some examples, the blocking mechanism 114 may be disposed in the middle of the hollow cartridge wall 112 or on a side near the needle 130.

In some examples, the blocking mechanism 114 may be a slip-resistant stripe (see fig. 1). In other examples, the blocking mechanism 114 may be a finger pinching portion, such as a hand-gripping hole, a hand-gripping protrusion, and the like. This can facilitate the operator to better secure the syringe 110 while the injector 10 is injecting.

In some examples, as shown in fig. 1, the outer circumference of the hollow cartridge wall 112 may be provided with graduation marks. In some examples, the graduation marks may be disposed on a side of the hollow barrel wall 112 proximate the needle 130. In this case, it can be facilitated to determine the injection amount of the injector 10.

Fig. 4 is a perspective view illustrating a connection portion between a cylinder 110 and a needle 130 of the syringe 10 for viscous and incompressible fluid according to an embodiment of the present disclosure.

In some examples, as shown in fig. 2 and 4, the syringe 110 may include a connection 113. The connecting portion 113 may be connected with the needle 130. In some examples, the connection portion 113 may be cylindrical. In some examples, the axis of the connection 113 may be coaxial with the axis of the hollow cartridge wall 112. In some examples, the connection portion 113 may be integrally formed with the hollow cartridge wall 112.

In some examples, as shown in fig. 2 and 3, the connection portion 113 may penetrate in the axial direction. That is, the connection portion 113 may have a through hole along the axial direction. In some examples, the through hole of the connection portion 113 may have a circular shape.

In some examples, as shown in fig. 4, the connection portion 113 may include a first barrel 1131 and a second barrel 1132. In some examples, the first cylinder 1131 may be disposed within the second cylinder 1132, and a certain gap (described in detail later) may exist between the first cylinder 1131 and the second cylinder 1132. In some examples, the axis of first cylinder 1131 may be coaxial with the axis of second cylinder 1132.

In some examples, the inner diameter of the first barrel 1131 of the connection 113 may be no greater than the inner diameter of the hollow barrel wall 112. In some examples, if the inner diameter of the first cylinder 1131 is smaller than the inner diameter of the hollow cylinder wall 112, the end of the hollow cylinder wall 112 near the connection portion 113 can be connected with the connection portion 113 in a tapered manner. Specifically, if the inner diameter of the first cylinder 1131 is smaller than the inner diameter of the hollow cylinder 112, the syringe 110 gradually contracts from the end of the hollow cylinder 112 close to the connection portion 113 until the inner diameter of the syringe 110 becomes equal to the inner diameter of the first cylinder 1131. In this case, hollow barrel wall 112 and first barrel 1131 can be connected to form barrel 110, and barrel 110 can be better fitted with needle 130.

In some examples, the second cylinder 1132 may be disposed between the tapered portion between the hollow cylinder wall 112 and the first cylinder 1131. In some examples, the length of the second barrel 1132 may be no greater than the length of the first barrel 1131. Examples of the present disclosure are not limited thereto, and the length of the second cylinder 1132 may be greater than that of the first cylinder 1131.

In some examples, the second barrel 1132 may have threads on an inner wall thereof. In this case, the second barrel 1132 may be fixed to the needle 130 (described later) by screw coupling. Examples of the present disclosure are not limited thereto, and the inner wall of the second barrel 1132 may have no thread, and the syringe 110 may be connected to the needle 130 by other methods (described later).

In some examples, as shown in fig. 1 and 2, the injector 10 may include a pushrod 120. The push rod 120 may be disposed within the syringe 110. The push rod 120 may move along the length of the syringe 110. In some examples, the ram 120 may be slidably or rotationally movable along the length of the syringe 110. In some examples, ram 120 may move along the length of barrel 110 from a first position 111a (see fig. 1) of barrel 110 distal needle 130 to a second position 111b (see fig. 1) proximal needle 130. In some examples, the target distance between first location 111a and second location 111b may be no greater than the length of hollow cylinder wall 112.

In some examples, as shown in fig. 2, the push rod 120 may have a rod body 121. In some examples, shaft 121 may be elongated. In some examples, the outer diameter of the rod body 121 may be no greater than the inner diameter of the hollow cylinder wall 112. Thereby, it can be ensured that the rod body 121 can move in the cylinder 110. In some examples, the length of the stick body 121 may be no less than the target distance.

In some examples, as shown in fig. 2, the outer circumference of the rod body 121 may be provided with a first thread. In some examples, the inner wall of the hollow cartridge wall 112 may be provided with threads that mate with the first threads. Thereby, the rod body 121 can be moved in a rotating manner along the longitudinal direction of the cylinder 110. Examples of the present disclosure are not limited thereto and, in some examples, the syringe 10 may be provided with a cap 140. The cover 140 may be provided with a screw thread (described later) to be engaged with the first screw thread.

In some examples, as shown in fig. 2, one end of the rod body 121 may be provided with a piston 122. In some examples, piston 122 may be integrally formed with rod 121. In other examples, piston 122 may be coupled to rod 121 by screwing, snapping, or adhering.

In some examples, the piston 122 may be disposed in the syringe 110 and may move in the syringe 110 following the rod body 121. In some examples, the shape of the piston 122 may be the same as the shape of the through-bore of the syringe 110 (e.g., the hollow barrel wall 112). In some examples, the piston 122 may be made of an elastic material. In some examples, the width of the piston 122 perpendicular to the axis of the syringe 110 may be no less than the inner diameter of the hollow barrel wall 112, i.e., the outer diameter of the piston 122 may be no less than the inner diameter of the syringe 110. For example, the width of the piston 122 perpendicular to the axis of the syringe 110 may be equal to or slightly larger than the inner diameter of the hollow barrel wall 112. In this case, it is possible to ensure that the piston 122 can move in the syringe and to suppress the fluid from flowing out of the piston 122 during injection.

In some examples, the sum of the length of the piston 122 in the axial direction of the syringe 110 and the length of the rod body 121 may be not less than the target distance.

In some examples, the other end of the rod body 121 may be provided with a grip 123. In some examples, grip 123 may be located on the exterior of syringe 110 when injector 10 is in operation. In some examples, the grip 123 may be formed in a handle shape, for example, a T-shaped handle or a circular hanging hole (see fig. 1). In some examples, the grip 123 may be integrally formed with the rod body 121. In some examples, the grip 123 may be connected to the rod body 12 by screwing, snapping, or adhering.

Fig. 5 is a perspective view illustrating the cap 140 of the syringe 10 for viscous and incompressible fluid according to the embodiment of the present disclosure.

In some examples, as shown in fig. 1 and 2, syringe 10 may be provided with a cap 140. In some examples, the cover 140 may be cylindrical (e.g., prism, cylinder, or plum blossom pillar, etc.). In some examples, the outer circumference of the cover 140 may be provided with an anti-slip structure.

In some examples, as shown in fig. 5, the cover 140 may be provided with a through hole 141. The rod body 121 can pass through the through hole 141. In some examples, the rod body 121 may be partially disposed in the cylinder 110 through the penetration hole 141 when the injector 10 is operated (described later in detail).

In some examples, cap 140 may be disposed at an end of barrel 110 distal to needle 130.

Fig. 6 is a partial cross-sectional view of the syringe 10 at the cap 140 illustrating a viscous and incompressible fluid according to embodiments of the present disclosure. Fig. 6 is an enlarged view of the area a in fig. 3.

In some examples, cap 140 may be integrally formed with syringe 110. Examples of the present disclosure are not limited thereto, and in some examples, as shown in fig. 5 and 6, the cover 140 may be provided with a groove 142. In some examples, the recess 142 may be an annular groove. The shape of the recess 142 may be the same as the shape of the hollow cartridge wall 112. In some examples, the sidewalls of groove 142 may be parallel to the axial direction of syringe 110. In some examples, the outer diameter of the structure formed by the side wall of the groove 142 away from the outer periphery of the cap body 140 (also referred to as the "inner side wall") can be no greater than the inner diameter of the hollow cartridge wall 112.

In some examples, cap 140 may be secured to barrel 110 by a snap-fit connection (not shown) via groove 142. Specifically, the shape of the groove 142 may be the same as the shape of the hollow cartridge wall 112. The recess 142 is an annular groove. The width between the two sidewalls of the groove 142 (i.e., the width of the groove 142) may be equal to the thickness of the hollow cylinder wall 112. The cap 140 may form a snap-fit structure with the hollow cylindrical wall 112 via the groove 142.

In other examples, the cover 140 may be fixed to the syringe 110 by a screw-coupling manner. For example, the cap body 140 may be threadedly fixed to the cylinder 110 through the groove 142 (see fig. 5 and 6). The side wall of recess 142 near the periphery of cap 140 (also referred to as the "outer side wall") may be provided with threads and the periphery of the end of barrel 110 distal to needle 130 may be provided with threads that mate with the threads. Or the side wall of recess 142 remote from the periphery of cover 140 (also referred to as the "inside wall") may be provided with threads and the inside wall of the end of barrel 110 remote from needle 130 may be provided with threads that mate with the threads. This enables cover 140 to be fixed to syringe 110. In some examples, the threads provided on the sidewalls of the groove 142 may be compression threads. Therefore, the problem of rotation of the cover body 140 when the pressure in the syringe 110 changes can be avoided.

In some examples, as shown in fig. 1 and 3, the cover 140 may be fixed on the syringe 110, and the rod body 121 may be disposed in the syringe 110 through the penetration hole 141 of the cover 140. In some examples, the inner diameter of the through hole 141 of the cover 140 may be not smaller than the outer diameter of the rod body 121. In some examples, as shown in fig. 2 and 6, if the outer circumference of the rod body 121 is provided with a first thread, the inner wall of the through hole 141 of the cover body 140 may be provided with a second thread engaged with the first thread. In this case, the push rod 120 can be rotated to move along the length direction of the cylinder 110, whereby a large pushing force can be provided and the injection amount of the injector 10 can be more precisely controlled.

As described above, in the present disclosure, when the injector 10 injects fluid, the operator may hold the holding portion 123 and the blocking mechanism 114 respectively, and may rotate or push the push rod 120 to inject fluid.

In some examples, as shown in fig. 1 and 2, syringe 10 may include a needle 130. In some examples, needle 130 extends lengthwise therethrough. That is, the needle 130 has a through hole 130a penetrating in the longitudinal direction. In some examples, needle 130 may be mounted at one end of barrel 110. Specifically, the needle 130 may be mounted at the connection portion 113 of the cylinder 110. In some examples, needle 130 may be in communication with barrel 110. That is, the penetration hole 130a may communicate with the penetration hole 110a of the cylinder 110 (see fig. 3). In this case, it is possible to make the fluid enter the needle 130 from the cylinder 110 and flow out of the needle 130 to complete the injection as the push rod 120 moves at the time of injection.

Fig. 7 is a partial cross-sectional view of syringe 10 at needle 130 illustrating a viscous and incompressible fluid in accordance with an embodiment of the present disclosure. Fig. 7 is an enlarged view of a region B in fig. 3.

In some examples, as shown in fig. 4 and 7, the needle 130 may include a needle tip 131 and a retainer portion 132. In some examples, the needle tip 131 may be integrally formed with the fixing portion 132. In some examples, the needle 130 may be coupled (e.g., threaded) with the coupling portion 113.

In some examples, needle 130 may be integrally formed with barrel 110. In other examples, the needle 130 may be connected to the connection portion 113 of the barrel 110 through the fixing portion 132. The connection may be, for example, a snap connection or a screw connection.

In some examples, the fixing portion 132 and the connection portion 113 may be connected by a screw connection. For example, as shown in fig. 4 and 7, the fixing portion 132 may have a cylindrical shape. The fixing portion 132 may have a through structure. The fixing portion 132 may have a third cylinder 1321. The inner diameter of the third cylinder 1321 may be not smaller than the outer diameter of the first cylinder 1131. The outer circumference of the third cylinder 1321 may be provided with a thread, and the inner wall of the second cylinder 1132 may be provided with a thread engaged with the thread. In this case, the third barrel 1321 may be fixed in the gap between the first barrel 1131 and the second barrel 1132 by a screw coupling manner. Thereby enabling the connection part 113 to be connected with the needle 130 by means of a screw connection.

In some examples, the fixing portion 132 and the connection portion 113 of the syringe 110 may be connected by a snap structure (not shown). For example, the fixing portion 132 may have a cylindrical shape, and the fixing portion 132 may have a through structure. The fixing portion 132 may have a third cylinder 1321, and the inner diameter of the third cylinder 1321 may be equal to the outer diameter of the first cylinder 1131. The shape of the third barrel 1321 may have the same shape as the gap between the first and

second barrels

1131 and 1132. The thickness of the third barrel 1321 may be equal to or slightly greater than the width of the gap between the first and

second barrels

1131 and 1132. In this case, third barrel 1321 may be snapped into a gap between first barrel 1131 and second barrel 1132. Thus, the fixing portion 132 can be connected to the cylinder 110 by a snap connection.

In some examples, as shown in fig. 7, the third barrel 1321 may be a pass-through structure. First barrel 1131 may be disposed within third barrel 1321 such that barrel 110 may communicate with needle 130 when connection 113 is connected to needle 130. In some examples, the length of the third barrel 1321 may not be greater than the depth of the gap. But examples of the present disclosure are not limited thereto, and the length of the third cylinder 1321 may be greater than the depth of the gap.

In other examples, the needle 130 may be connected to the connecting portion 113 by the fixing portion 132 and the connecting portion 113 through adhesion.

In some examples, as shown in fig. 7, when the needle 130 is mounted to the cylinder 110, the inner diameter of the through hole 110a of the cylinder 110 may be equal to the inner diameter of the through hole 130a at the place where the cylinder 110 communicates with the needle 130.

In some examples, as shown in fig. 4, the fixing part 132 may have a mounting aid 1322. In this case, the needle 130 can be held by an operator while being mounted to the cylinder 110, and the mounting by the operator can be facilitated.

In some examples, the installation assistance piece 1322 may be formed on the outer circumference of the third barrel 1321 on the side close to the needle tip 131. In some examples, the installation assistance piece 1322 may be a non-slip structure formed on the outer circumference of the third cylinder 1321. For example, the mounting aide 1322 may be an elongated, semi-circular, or oval shaped handle (see fig. 4). The installation aids 1322 may also be skid-resistant strips. In some examples, the mounting aide 1322 may also be prismatic or cylindrical (not shown). The attachment auxiliary 1322 may have a through hole having the same shape and outer diameter as the third cylindrical body 1321. The third barrel 1321 may be disposed within the mounting aid 1322. The axis of the installation assistant member 1322 may be coaxial with the axis of the third cylinder 1321. In this case, it can be convenient for an operator to connect the fixing part 132 with the connecting part 113 by holding the installation assistance piece 1322.

In some examples, the installation aid 1322 may be integrally formed with the third barrel 1321.

In some examples, as shown in fig. 4, the needle tip 131 may be disposed on the fixing portion 132. In some examples, the needle tip 131 may be cylindrical. In some examples, the needle tip 131 may be formed into an elliptical shape at a port away from the fixing portion 132 by chamfering on a cylinder. In some examples, the needle tip 131 may pass through in an axial direction. In some examples, the needle tip 131 may be in communication with the fixation portion 132.

In some examples, the needle tip 131 may be connected to and in communication with the junction 113 through the fixation section 132. In some examples, the inner diameter of the needle tip 131 may be no greater than the inner diameter of the barrel 110. In some examples, the needle 130 may have an inner diameter of 2-6 mm. Thereby facilitating better injection of fluid by syringe 10.

In some examples, as shown in fig. 7, when the minimum inner diameter of the barrel 110 is greater than the inner diameter of the needle tip 131, a transition section 133 with a gradually decreasing inner diameter may be formed between the barrel 110 and the needle tip 131. In some examples, the transition segment 133 may be formed in the fixation portion 132 (see fig. 7 and 10). Specifically, needle 130 may have a portion with a maximum inner diameter, a portion with a target inner diameter, and a transition segment 133. The maximum inner diameter of needle 130 may be the same as the inner diameter of first barrel 1131. The target inner diameter may be the final desired inner diameter of the syringe 10, i.e., the inner diameter of the needle tip 131 (e.g., 2-6 mm). Needle 130 with the largest inner diameter portion may be in communication with first barrel 1131. The transition segment 133 may be disposed between the portion having the largest inner diameter and the portion having the target inner diameter to enable the two portions to communicate.

Examples of the present disclosure are not limited thereto, and in some examples, the transition segment 133 may also be formed on the syringe 110 (e.g., the first barrel 1131) (not shown).

In some examples, the inner profile of the transition segment 133 may be tapered or rounded in cross-section along the axial direction of the syringe 110. Whereby the resistance to injection of fluid can be reduced.

In some examples, a helical cutting mechanism 134 may be disposed within the needle 130. In some examples, the helical cutting mechanism 134 may protrude relatively from the inner wall of the needle 130. In this case, as the fluid flows through the helical shear mechanism 134, the fluid may be subjected to the shear forces of the helical shear mechanism 134. This reduces the resistance of the fluid inside the needle 130, which facilitates better injection of the fluid. But examples of the present disclosure are not limited thereto and the helical cutting mechanism 134 may be relatively recessed in the inner wall of the needle 130.

In some examples, the helical cutting mechanism 134 may be integrally formed with the needle 130. Examples of the disclosure are not limited thereto and in some examples, the helical cutting mechanism 134 may be disposed within the needle 130 by way of an adhesive or snap fit, or the like.

Fig. 8 is a perspective view illustrating the needle 130 according to the embodiment of the present disclosure. Fig. 9 illustrates a cross-sectional view of fig. 8 according to an embodiment of the present disclosure.

In some examples, the helical shearing mechanism 134 may be implemented as a screw extrusion structure 1341 (see fig. 8 and 9).

In some examples, the screw extrusion structure 1341 may be a protrusion formed on an inner wall of the needle 130 and having a double spiral structure (see fig. 8 and 9). For example, the protrusion 1341a and the protrusion 1341b may be formed on the inner wall of the needle tip 131, and the protrusion 1341a and the protrusion 1341b may be formed in a double spiral structure.

In some examples, the screw extrusion structure 1341 may be formed by a plurality of sets of protrusions in a double helix structure, and two adjacent sets of protrusions may not be connected to each other or may be present at a distance. That is, the protrusions of the double spiral structure formed on the inner wall of the needle 130 may be discontinuous to form the screw extrusion structure 1341 (see fig. 8 and 9). For example, as shown in fig. 8, the screw extrusion structure 1341 may be formed by a plurality of sets of protrusions having a double spiral structure, wherein the

protrusions

1341a and 1341b may have a double spiral structure, the

protrusions

1341c and 1341d may have a double spiral structure, and neither the protrusions 1341a nor the protrusions 1341b may be connected to the

protrusions

1341c and 1341d, so that the plurality of sets of protrusions having a double spiral structure may form the screw extrusion structure 1341.

Examples of the present disclosure are not limited thereto, and in some examples, the screw extrusion structure 1341 may be formed by a set of protrusions having a continuous and double spiral structure, that is, the protrusions having a double spiral structure formed on the inner wall of the needle 130 may be continuous to form the screw extrusion structure 1341 (not shown). In other examples, one of the projections in the double helix may be continuous and formed on the inner wall of the needle, and the other may be discontinuous. That is, the discontinuous protrusions may be formed by combining a plurality of sets of protrusions, and may be formed as a double helix structure with the continuous protrusions, respectively (not shown).

In other examples, the screw extrusion structure 1341 may also be a groove (not shown) formed on the inner wall of the needle 130 and having a double spiral structure.

In other examples, the screw extrusion structure 1341 may also be a protrusion or a groove (not shown) formed on the inner wall of the needle 130 and having a single spiral structure. I.e., the needle 130 is formed with threads on the inner wall thereof.

Fig. 10 is a partial sectional view illustrating a needle 130 according to another embodiment of the present disclosure. Fig. 11 is a perspective view illustrating the rotor structure 1342 of fig. 10 according to the embodiment of the present disclosure. Fig. 12 is a partially enlarged view of fig. 11 according to the embodiment of the present disclosure. Fig. 13(a) and 13(b) are perspective views showing different orientations of the unit body 1342a of the rotor structure 1342 according to the embodiment of the present disclosure. Fig. 12 may be a partially enlarged view of the region S in fig. 11.

In some examples, the helical shear mechanism 134 may be implemented as a rotor structure 1342 (see fig. 10 and 11). In some examples, the rotor structure 1342 may be disposed within the through hole 130a of the needle 130.

In some examples, the rotor structure 1342 may include a plurality of unit cells 1342 a. In some examples, the unit cell 1342a may be helical. In some examples, the unit cell 1342a may be formed by rotating two sides of one rectangle by 180 degrees with respect to each other along a center line (see fig. 13).

In some examples, the unit body 1342a may be disposed within the needle 130. In some examples, the rotor structure 1342 may be formed from a plurality of unit cells 1342a (see fig. 11). For example, a plurality of unit cells 1342a may be arranged and connected together to form a rotor structure 1342.

In some examples, the positions where adjacent two unit cells 1342a are connected in the rotor structure 1342 may be different (see fig. 12). In some examples, adjacent unit bodies 1342a may be rotated relative to each other by 90 degrees. However, the present disclosure is not limited thereto, and in some examples, the positions where the adjacent two unit bodies 1342a are connected in the rotor structure 1342 may be the same (not shown). In some examples, a plurality of unit cells 1342a may be arranged and connected together to form a channel for fluid communication (see line 13421 in fig. 11). For example, as shown in fig. 11 and 12, a plurality of unit bodies 1342a may be sequentially connected together to form a rotor structure 1342, wherein a line 13421 may indicate a channel formed by the plurality of unit bodies 1342a, the connection position or the placement orientation of two adjacent unit bodies 1342a1 and unit body 1342a2 may be different, and the unit bodies 1342a1 and unit bodies 1342a2 may be relatively rotated by 90 degrees, that is, the unit bodies 1342a2 is rotated by 90 degrees to obtain the orientation corresponding to the unit bodies 1342a 1.

In some examples, a plurality of unit bodies 1342a may be integrally formed to form the rotor structure 1342. Examples of the disclosure are not so limited and in some examples, a plurality of unit cells 1342a may be connected together by other means to form the rotor structure 1342. For example, a plurality of unit cells 1342a may be bonded together to form a rotor structure 1342.

In some examples, the unit body 1342a forming the rotor structure 1342 may be sized and shaped to match the inner diameter of the needle 130 in which it is located. That is, the unit bodies 1342a may not be larger than the inner diameter of the respective corresponding needles 130. For example, the rotor structure 1342 may be disposed in part in the needle 130 having the largest inner diameter and the rotor structure 1342 may be disposed in part in the needle 130 having the target inner diameter. In this case, the unit body 1342a3 disposed at the portion having the largest inner diameter may be larger in size than the unit body 1342a1 and the unit body 1342a2, etc., disposed at the portion having the target inner diameter.

In some examples, the rotor structure 1342 may be placed into the needle 130 from a port remote from the needle tip 131 prior to assembly of the needle 130 to the barrel 110.

In some examples, the rotor structure 1342 may be disposed within the needle 130. For example, the rotor structure 1342 may be disposed partially within the needle tip 131, partially within the transition segment 133 or the needle 130 having the largest inner diameter portion (see fig. 10). In this case, the outer diameter of the rotor structure 1342 (e.g., 1342a3) disposed within the transition segment 133 or needle 130 having the largest inner diameter may be greater than the inner diameter of the needle tip 131, thereby enabling better disposition of the rotor structure 1342 within the needle 130.

In other examples, the rotor structure 1342 may be placed into the needle 130 from a port remote from the needle tip 131 before the needle 130 is assembled with the barrel 110, and the rotor structure 1342 may be adhered to the inner wall of the needle 130.

In the present disclosure, as described above, an injector 10 for viscous and incompressible fluids may include a barrel 110, a ram 120, and a needle 130. Syringe 110 may be used to contain fluids; the push rod 120 may be disposed in the cylinder 110 and movable along the cylinder 110, and the push rod 120 may have a lever body 121, a piston 122 disposed at one end of the lever body 121 and located in the cylinder 110, and a grip 123 disposed at the lever body 121. Ram 120 may move along the interior of barrel 110 from a first position 111a of barrel 110 distal needle 130 to a second position 111b proximal needle 130. A needle 130 may be mounted at one end of the barrel 110 and in communication with the barrel 110, and a helical cutting mechanism 134 may be disposed within the needle 130. The inner diameter of the cylinder 110 may be larger than that of the needle 130, and a transition section 133 having a gradually reduced inner diameter may be formed between the cylinder 110 and the needle 130. When the syringe 110 contains fluid and the ram 120 moves from the first position 111a to the second position 111b of the syringe 110, fluid may be forced out of the needle 130 through the helical shear mechanism 134. This can reduce the resistance of the syringe 10 when injecting fluid, and can facilitate fluid injection.

While the invention has been specifically described above in connection with the drawings and examples, it will be understood that the above description is not intended to limit the invention in any way. Those skilled in the art can make modifications and variations to the present invention as needed without departing from the true spirit and scope of the invention, and such modifications and variations are within the scope of the invention.

Claims

1. An injector for viscous and incompressible fluid comprises a syringe for containing fluid, a push rod arranged in the syringe and movable along the syringe, a cover for shielding a nozzle of the syringe, and a needle head arranged at one end of the syringe and communicated with the syringe, the push rod is provided with a rod body, a piston which is arranged at one end of the rod body and is positioned in the needle cylinder, and a holding part which is arranged on the rod body, the cover body is provided with a through hole, the push rod moves from a first position of the needle head far away from the needle head to a second position of the needle head close to the needle head along the inner part of the needle cylinder through the through hole, the periphery of the rod body is provided with a first thread, the inner wall of the through hole is provided with a second thread matched with the first thread, and the piston moves in the needle cylinder by rotating the push rod; a spiral shearing mechanism is arranged in the needle head, the inner diameter of the needle cylinder is larger than that of the needle head, a transition section with gradually reduced inner diameter is formed between the needle cylinder and the needle head, wherein when the syringe contains the fluid and the ram moves from the first position to the second position of the syringe, the fluid is expressed from the needle by the helical shear mechanism, as the fluid flows through the helical shear mechanism, the fluid is subjected to shear forces of the helical shear mechanism to reduce the resistance of the fluid inside the needle, the spiral shearing mechanism is a screw extrusion structure or a rotor structure, the screw extrusion structure is formed on the inner wall of the needle head and is a protrusion of a double-spiral structure, the rotor structure is formed by connecting a plurality of unit bodies, and the unit bodies are in a spiral shape.

2. The syringe of claim 1,

and scale marks are arranged on one side of the needle cylinder close to the needle head.

3. The syringe of claim 1,

the outer diameter of the piston is not less than the inner diameter of the needle cylinder.

4. The syringe of claim 1,

the cover body is provided with a groove with threads, and the cover body is fixed on the needle cylinder in a threaded connection mode through the groove.

5. The syringe of claim 1,

the needle cylinder comprises a hollow cylinder body, a connecting part connected with the needle head and a blocking mechanism which is arranged on the periphery of the hollow cylinder body and used for preventing the needle cylinder from following the push rod to move when the injector injects.

6. The syringe of claim 5,

the blocking mechanism is arranged to cooperate with the holding portion, and the blocking mechanism is an anti-skid strip or a finger-pinching portion.

7. The syringe of claim 5,

the connecting part is connected with the needle head in a threaded connection mode, so that the inner diameter of the needle head is matched with the inner diameter of the connecting part.

8. The syringe of claim 1,

the transition section has an inner contour which is tapered or rounded in a cross section along the axial direction of the cylinder.

9. The syringe of claim 1,

the inner diameter of the needle head is 2-6 mm.