CN210542707U - Bidirectional low-resistance syringe - Google Patents
Bidirectional low-resistance syringe Download PDFInfo
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- CN210542707U CN210542707U CN201822272108.2U CN201822272108U CN210542707U CN 210542707 U CN210542707 U CN 210542707U CN 201822272108 U CN201822272108 U CN 201822272108U CN 210542707 U CN210542707 U CN 210542707U
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Abstract
The utility model discloses a bidirectional low resistance injector, wherein, one end of a piston rod positioned in a needle cylinder is fixedly connected with a bearing disc; the piston is annular, the piston is sleeved outside the bearing disc, the outer side of the piston is contacted with the inner wall of the needle cylinder, a plurality of steel balls which are uniformly distributed in an annular shape are arranged in the annular piston, and the steel balls are connected with the piston rod through a connecting rod which penetrates through the bearing disc; the piston rod is provided with a resistance reducing body, the resistance reducing body comprises two parallel mounting plates which are right opposite, an installation shaft is fixedly connected between the two mounting plates, the installation shaft is positioned at one end of the mounting plate close to the inner wall of the needle cylinder, and a roller is arranged on the installation shaft. The utility model discloses be used for solving among the prior art and can't reduce the resistance of syringe pull-up imbibition in-process to and the unable problem of overcoming of produced injection resistance is warp to the piston, realize that syringe push-and-pull in-process homoenergetic can reduce the resistance, overcome the purpose of the produced injection resistance of piston deformation simultaneously.
Description
Technical Field
The utility model relates to an injector field, concretely relates to two-way low resistance injector.
Background
Syringes are a common medical device. As early as the 15 th century, kathler, italian, proposed the principle of the syringe. Gas or liquid is primarily drawn or injected with a needle. Syringes may also be used for injection through rubber septa in medical devices, containers, scientific instruments such as in some chromatography. The syringe barrel may be plastic or glass and is typically provided with a graduated indicator of the volume of fluid in the syringe. The glass syringe can be sterilized by an autoclave, and the glass syringe has small resistance when in use, thereby being convenient for medical personnel to use and operate. However, because of the low cost of plastic syringe disposal, most modern medical syringes are made of plastic, and such disposable plastic syringes also significantly reduce cross-transmission of blood borne diseases. However, when compared with a glass syringe, a plastic syringe has a larger resistance during pushing and pulling, and is inconvenient to use. For this reason, some low resistance plastic syringe improvements have appeared in the prior art, and such improvements can be divided into two parts: one part is to improve the plastic material, and the other part is to improve the structure. For the scheme of improving the structure of the injector, the air pressure on two sides of the piston is mostly adjusted through structural improvement, but because the piston cavity of the injector needs to ensure the stability of the sealing state without leakage after imbibition, the improvement can only reduce the resistance in the process of pushing down the injector to inject, and can not reduce the resistance in the process of pulling up the injector to imbibe, and the manual action is only needed for pulling up the injector to achieve the atmospheric pressure, which is the process with the maximum resistance in the working process of the injector, and the prior art can not effectively reduce the resistance in the process. In addition, the piston of the syringe is generally a rubber plug such as rubber, and when the piston is pulled by the acting force of the piston rod in the working process, the piston can generate the deformation protruding away from the movement direction, as shown in the attached drawing 2, the arrow indicates the movement direction of the piston rod, and the pulling deformation of the rubber plug positioned below is obviously seen. The elastic restoring force generated by the deformation also forms a part of the working resistance of the injector, and the part of the resistance is not considered by the existing structural improvement.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a two-way low resistance syringe to solve among the prior art can't reduce the resistance of syringe pull-up imbibition in-process, and to the unable problem of overcoming of produced injection resistance of piston deformation, realize that the syringe push-and-pull in-process homoenergetic can reduce the resistance, overcome the purpose of the produced injection resistance of piston deformation simultaneously.
The utility model discloses a following technical scheme realizes:
a bidirectional low-resistance injector comprises a needle cylinder, a piston positioned in the needle cylinder and a piston rod connected with the piston, wherein one end of the piston rod positioned in the needle cylinder is fixedly connected with a bearing disc, and the axis of the piston rod is collinear with the axis of the bearing disc; the piston is annular, the piston is sleeved outside the bearing disc, the outer side of the piston is in contact with the inner wall of the needle cylinder, a plurality of steel balls which are uniformly distributed in the annular piston are arranged in the annular piston, the steel balls are connected with the piston rod through a connecting rod penetrating through the bearing disc, and the distance between the steel balls and the inner wall of the needle cylinder is 10% -20% of the inner diameter of the needle cylinder; fall along a plurality of groups of axial evenly distributed on the piston rod and hinder the subassembly, every group falls to hinder the subassembly and includes along the outer body that hinders that falls of circumference annular equipartition at the piston rod, it includes two mounting panels that are parallel to each other and just right to fall to hinder the body, the one end of mounting panel is fixed on the piston rod, the other end radially extends towards cylinder inner wall direction along the piston rod, fall and hinder fixed connection installation axle between internal two mounting panels, the installation hub is located the one end that the mounting panel is close to the cylinder inner wall, install the epaxial gyro wheel that sets up, the gyro wheel can roll along the axial of cylinder at the cylinder inner.
To the unable resistance to the syringe pull-up imbibition in-process among the prior art reduce to and the unable problem of overcoming of the produced injection resistance of piston deformation, the utility model discloses at first provide a two-way low resistance syringe. The utility model discloses discovery among the people research process, among the prior art, the piston rod of syringe is inserted to the piston in, is connected with the piston through a miniature flange, and the piston rod removes the in-process and can produce very big dragging to the outer fringe part of piston, leads to the piston to warp and forms the arch, and this is all because the piston need be paved with the pulling of the piston skeleton undersize that the cylinder is inside and rubber was made among the prior art and can't resist the piston rod. The utility model discloses on the basis of above-mentioned research discovery, the tip at the piston rod has set up the bearing dish, the bearing dish is discoid structure as the name implies, the axis collineation of its axis and piston rod for the even dispersion of effort of piston rod is to arbitrary position on the bearing dish, the utility model provides a piston no longer is traditional disc overall structure, but forms the loop configuration cover outside the bearing dish, consequently on the cross section of cylinder, the area that the piston is shared obviously reduces, the atress of piston passes through the bearing dish and transmits, the bearing dish all can transmit the push-and-pull effort of piston rod to the piston in each direction in week, makes the piston atress no longer be from the thrust or the pulling force at center, but forms from the inboard whole circle application of force scope of annular, makes when the effort of the same size is used, at first the outer fringe of piston is closer apart from the distance of stress point, the drawing that inevitable piston received can be littleer, The overall deformation will be less, providing less reset force, and less injection resistance against piston deformation. In addition, set up the steel ball of a plurality of annular equipartitions in the piston, the steel ball passes through the connecting rod and is connected with the piston rod, the connecting rod plays the connecting action, the steel ball is located inside the piston, at first, play the reinforcing action, reduce the possibility that the piston is dragged and out of shape, secondly, be convenient for the effort of piston rod to pass through the steel ball and transmit to the inside more outside position of piston, ensure that the piston is no longer central atress, but through a plurality of steel balls along circumference evenly distributed, also evenly disperse the effort of piston rod to the piston to each position of piston, because the interval between steel ball and the cylinder inner wall is 10% -20% of cylinder internal diameter, therefore the steel ball is very close apart from the outer fringe distance of piston, make the whole of piston all receive the effort that the piston rod transmitted, overcome among. And simultaneously, the utility model discloses fall along a plurality of groups of axial evenly distributed and hinder the subassembly on the piston rod, every group falls to hinder the subassembly and includes along the outer body that hinders that falls of circumference annular equipartition outside the piston rod, it includes two parallel and just right mounting panels to fall to hinder the body, the one end of mounting panel is fixed on the piston rod, the other end radially extends towards cylinder inner wall direction along the piston rod, fall and hinder fixed connection installation axle between internal two mounting panels, the installation epaxial gyro wheel that sets up of installation, the gyro wheel can roll along the axial of cylinder at the cylinder inner wall to be located the one end that the mounting panel is close to the cylinder inner wall. Therefore, in the process of pushing and pulling the piston rod, the piston rod and the inner wall of the needle cylinder realize relative motion through the rolling friction of the roller. In the conventional syringe, in order to ensure the structural stability of the piston, a plurality of flanges contacting with the inner wall of the cylinder are arranged outside the piston rod to ensure the structural stability of the piston in the radial direction. The traditional structure can cause large-area sliding friction between each flange and the inner wall of the syringe barrel during the movement of the piston rod, thereby increasing the movement resistance of the piston rod. In the application, the friction between the piston rod and the needle cylinder is completely realized by rolling friction through the arrangement of the resistance reducing component, so that the friction resistance is obviously reduced; meanwhile, each resistance reducing component can also ensure the structural stability of the piston in the radial direction. The utility model discloses during the use, no matter the piston rod is in and promotes flowing back or pulling imbibition in-process, the deformation of piston can both obtain effective control, therefore the resistance that piston deformation caused all compares and is showing in prior art and reduces, all remove based on rolling friction between piston rod and the cylinder simultaneously, frictional force is also minimum, consequently still solved among the prior art can't carry out the problem that reduces to the resistance of syringe pulling imbibition in-process, the effect that the syringe push-and-pull in-process homoenergetic enough reduced resistance has been realized. The arrangement of the steel balls also utilizes the larger surface area of the spherical steel balls, so that the contact area between the spherical steel balls and the piston is increased, and the force transmission area is increased.
Further, the both sides surface of bearing dish all sets up mutual just right annular, the annular is concentric with the bearing dish, the height that highly is greater than the lateral wall of the inside wall of annular, the inside wall setting of annular piston with two annular assorted cooperation portions, the cooperation portion card is in the annular. The height of the inner side wall of the ring groove is larger than that of the outer side wall, namely the height of the side wall of the outward side of the ring groove is lower, so that the piston matching part can be conveniently clamped. In the scheme, the annular groove is matched with the matching part, so that the stable connection between the piston and the bearing disc is realized.
The bearing disc, the piston rod and the needle cylinder are all made of plastics, and the bearing disc and the piston rod are integrally formed; the piston is a rubber plug. The bearing disc and the piston rod are integrally formed, and when the piston is clamped with the bearing disc, the piston and the piston rod are relatively fixed.
The distance between two adjacent resistance reducing assemblies is 1-2 cm; the roller in the resistance reducing assembly is made of plastics. The roller is made of plastic, so that the cost can be further reduced. The distance between the two resistance reducing components is 1-2 cm, and the problem that the inner space of the needle cylinder is greatly occupied to influence the volume of the needle cylinder due to too much too-close distance is avoided.
The resistance reducing components are at least two. The number of the resistance reducing components is at least two, so that the position relation of the piston is stable and reliable through the principle of positioning a straight line at two points.
The central angle of the axes of two adjacent connecting rods on the section of the bearing disc is 45 degrees.
Preferably, the steel ball is hollow inside. Reduce the weight of steel ball, reduce the utility model discloses a whole dead weight reduces material consumption simultaneously, practices thrift the cost.
The steel ball is prepared by the following method:
(A) mixing and sintering the components according to the following weight percentage to form balls, wherein iron powder, carbon powder, phosphorus powder and aluminum powder are mixed in a ratio of 6:2:1: 1;
(B) quenching; screening materials in layers according to the particle size;
(C) grinding in a ball mill for 30 min.
A preparation method of a bidirectional low-resistance syringe comprises the following steps:
(a) prefabricating a bearing disc, an annular piston and a resistance reducing body, wherein an annular opening is formed in the inner side wall of the piston, matching parts matched with the two annular grooves are formed in the inner side wall of the annular piston, and the two matching parts are respectively positioned on two sides of the opening; an accommodating cavity matched with the steel ball is formed in the piston, and the accommodating cavity is communicated with the opening;
(b) opening the opening of the inner side wall of the piston, and extruding steel balls into the containing cavities from the opening, so that each containing cavity is provided with one steel ball, and the outer surfaces of the steel balls are bonded with the containing cavities;
(c) inserting connecting rods from the openings to enable each steel ball to be fixedly connected with one connecting rod, then expanding the piston from the annular interior, inserting one end, far away from the steel balls, of each connecting rod into the force bearing disc, and enabling the matching parts of the pistons to be clamped in the corresponding annular grooves;
(d) the resistance reducing bodies are fixed on the piston rod, so that the plurality of resistance reducing bodies form a group of resistance reducing assemblies to complete the fixation of the plurality of groups of resistance reducing assemblies;
(e) and placing the completed piston rod into the needle cylinder.
The arrangement of the opening in the method ensures that the annular piston can be spread, so that the steel balls can be conveniently extruded into the accommodating cavity through the opening. The steel ball surface bonds with the chamber that holds to ensure that the steel ball can connect into overall structure, very big improvement with the piston the utility model discloses a atress wholeness.
The bonding method of the steel balls and the accommodating cavity comprises the following steps: before the steel balls are placed in the containing cavity, 2-3 ml of adhesive is injected into the containing cavity, a layer of adhesive is uniformly coated on the surfaces of the steel balls, and then the steel balls are extruded into the containing cavity. After the steel balls are filled into the containing cavity, the filled adhesive is lifted and quickly extruded to be automatically dispersed, and meanwhile, the adhesive smeared on the surfaces of the steel balls in advance is matched, so that stable adhesion between the steel balls and the containing cavity is realized under the condition that the inside of the containing cavity cannot be operated.
The connecting rod is connected with the steel balls through threads, the connecting rod is connected with the bearing disc through the quick-connection connector, and the connecting rod is abutted against the surface of the piston rod when being inserted to the bottom. When the steel ball is placed into the containing cavity, the threaded hole on the steel ball faces the opening direction, and then the connecting rod is aligned with the threaded hole on the steel ball and screwed into the steel ball, so that stable and detachable connection between the steel ball and the connecting rod can be realized. The connecting rod is connected with the bearing disc through the quick connector, and any quick connector in the prior art can be suitable for the application to realize quick matching connection.
Compared with the prior art, the utility model, following advantage and beneficial effect have:
1. the utility model relates to a two-way low resistance syringe, the piston no longer is traditional disk overall structure, but form the loop configuration cover outside the bearing dish, consequently on the cross section of cylinder, the area occupied by piston obviously reduces, the atress of piston transmits through the bearing dish and comes, the bearing dish all can transmit the push-and-pull effort of piston rod to the piston in each direction in week, make the piston atress no longer be from the thrust or the pulling force at center, but form from the inboard whole circle force application scope of annular, make when the effort of equidimension is used, at first the distance of piston outer fringe distance stress point is more nearly, the dragging that inevitable piston received can be littleer, whole deformation can be littleer, thereby the reset force that provides is littleer, overcome the produced injection resistance of piston deformation then littleer.
2. The utility model relates to a two-way low resistance syringe, the steel ball is located inside the piston, at first play the additional strengthening, reduce the piston and be dragged the possibility of deformation, secondly the effort of the piston rod of being convenient for passes through the steel ball and transmits to the inside position that leans on the outside of piston, ensure that the piston is no longer central atress, but through a plurality of steel balls along circumference evenly distributed, with the piston rod to the also evenly dispersed of effort of piston to each position of piston, because the outer fringe distance of steel ball apart from the piston is very close, make the whole of piston all receive the effort that the piston rod transmitted and come, the deformation that leads to because the central atress of piston among the prior art has been overcome.
3. The utility model relates to a two-way low resistance syringe, no matter the piston rod is in and promotes flowing back or pulling imbibition in-process, the deformation of piston can both obtain effective control, consequently, the resistance that piston deformation caused all compares and is showing in prior art and reduces, all remove based on rolling friction between piston rod and the cylinder simultaneously, frictional force is also minimum, consequently, the problem that can't reduce the resistance of syringe pulling imbibition in-process among the prior art has still been solved, the effect that the in-process homoenergetic reduced resistance of syringe push-and-pull has been realized. The arrangement of the steel balls also utilizes the larger surface area of the spherical steel balls, so that the contact area between the spherical steel balls and the piston is increased, and the force transmission area is increased.
4. The utility model relates to a two-way low resistance syringe, the steel ball pours into and holds and will wherein mention the quick extrusion of the bonding agent of pouring into and make it automatic dispersion open after the chamber, cooperates the bonding agent that the steel ball surface was paintd in advance again simultaneously, realizes holding steel ball under the condition of the unable operation of intracavity portion and holding the stable bonding between the chamber.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic diagram of a prior art structure;
FIG. 2 is a schematic illustration of a prior art piston deformation;
FIG. 3 is a cross-sectional view through the axis of the syringe according to an embodiment of the present invention;
3 FIG. 3 4 3 is 3 a 3 sectional 3 view 3 taken 3 along 3 the 3 line 3 A 3- 3 A 3 in 3 FIG. 3 3 3; 3
FIG. 5 is a cross-sectional view taken along line B-B of FIG. 3;
fig. 6 is a partially enlarged view of C in fig. 5.
Reference numbers and corresponding part names in the drawings:
1-needle cylinder, 2-piston, 201-matching part, 3-piston rod, 4-bearing disc, 5-steel ball, 6-connecting rod, 7-mounting plate and 8-mounting shaft.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.
Example 1:
the bidirectional low-resistance injector shown in fig. 3 to 6 comprises a needle cylinder 1, a piston 2 located in the needle cylinder 1, and a piston rod 3 connected with the piston 2, wherein one end of the piston rod 3 located inside the needle cylinder 1 is fixedly connected with a force bearing disc 4, and the axis of the piston rod 3 is collinear with the axis of the force bearing disc 4; the piston 2 is annular, the piston 2 is sleeved outside the bearing disc 4, the outer side of the piston 2 is in contact with the inner wall of the needle cylinder 1, a plurality of annularly and uniformly distributed steel balls 5 are arranged in the annular piston 2, the steel balls 5 are connected with the piston rod 3 through a connecting rod 6 penetrating through the bearing disc 4, and the distance between the steel balls 5 and the inner wall of the needle cylinder 1 is 15% of the inner diameter of the needle cylinder 1; fall along a plurality of groups of axial evenly distributed on the piston rod 3 and hinder the subassembly, every group falls to hinder the subassembly and includes along the outer body that hinders that falls of circumference annular equipartition piston rod 3, it includes two be parallel to each other and just right mounting panel 7 to fall to hinder the body, the one end of mounting panel 7 is fixed on piston rod 3, the other end radially extends towards 1 inner wall direction of cylinder along piston rod 3, fall and hinder fixed connection installation axle 8 between internal two mounting panels 7, installation axle 8 is located the one end that mounting panel 7 is close to 1 inner wall of cylinder, set up gyro wheel 9 on the installation axle 8, gyro wheel 9 can roll along 1 axial of cylinder at 1 inner wall of cylinder.
The piston no longer is traditional disk overall structure, but form the loop configuration cover outside the bearing dish, consequently on the cross section of cylinder, the area occupied by the piston obviously reduces, the atress of piston transmits through the bearing dish and comes, the bearing dish all can transmit the push-and-pull effort of piston rod to the piston in all directions on circumference, make the piston atress no longer be from central thrust or pulling force, but form the inboard whole circle application of force scope of annular, make when the effort of equidimension is used, at first the piston outer fringe is closer apart from the distance of stress point, the pulling that inevitable piston received can be littleer, whole deformation can be littleer, thereby the reset power that provides is littleer, overcome the produced injection resistance of piston deformation then littleer. In addition, set up the steel ball of a plurality of annular equipartitions in the piston, the steel ball passes through the connecting rod and is connected with the piston rod, the connecting rod plays the connecting action, the steel ball is located inside the piston, at first, play the reinforcing action, reduce the possibility that the piston is dragged and out of shape, secondly, the effort of the piston rod of being convenient for passes through the steel ball and transmits to the inside more outside position of piston, ensure that the piston is no longer central atress, but through a plurality of steel balls along circumference evenly distributed, also evenly disperse the effort of piston rod to the piston to each position of piston, because the interval between steel ball and the cylinder inner wall is 15% of cylinder internal diameter, therefore the steel ball is very close apart from the outer fringe distance of piston, make the whole of piston all receive the effort that the piston rod transmitted, overcome. Simultaneously, this embodiment falls along a plurality of groups of axial evenly distributed and hinders the subassembly on the piston rod, and every group falls to hinder the subassembly and includes along the outer body that hinders that falls of circumference annular equipartition at the piston rod, it includes two parallel to each other and just right mounting panel to fall to hinder the body, the one end of mounting panel is fixed on the piston rod, the other end radially extends towards cylinder inner wall direction along the piston rod, fall and hinder fixed connection installation axle between two internal mounting panels, the installation epaxial one end that is close to the cylinder inner wall that sets up the gyro wheel, the gyro wheel can roll along the axial of cylinder at the cylinder inner wall. Therefore, in the process of pushing and pulling the piston rod, the piston rod and the inner wall of the needle cylinder realize relative motion through the rolling friction of the roller. In the conventional syringe, in order to ensure the structural stability of the piston, a plurality of flanges contacting with the inner wall of the cylinder are arranged outside the piston rod to ensure the structural stability of the piston in the radial direction. The traditional structure can cause large-area sliding friction between each flange and the inner wall of the syringe barrel during the movement of the piston rod, thereby increasing the movement resistance of the piston rod. In the embodiment, the friction between the piston rod and the needle cylinder is completely realized by rolling friction through the arrangement of the resistance reducing component, so that the friction resistance is obviously reduced; meanwhile, each resistance reducing component can also ensure the structural stability of the piston in the radial direction. The steel ball is hollow in the embodiment.
Example 2:
as shown in fig. 3 to fig. 6, on the basis of embodiment 1, the two side surfaces of the bearing disc 4 are provided with ring grooves facing each other, the ring grooves are concentric with the bearing disc 4, the height of the inner side wall of each ring groove is greater than that of the outer side wall, the inner side wall of the annular piston 2 is provided with a matching portion 201 matched with the two ring grooves, and the matching portion 201 is clamped in the ring grooves. The bearing disc 4, the piston rod 3 and the needle cylinder 1 are all made of plastics, and the bearing disc 4 and the piston rod 3 are integrally formed; the piston 2 is a rubber plug. The distance between two adjacent resistance reducing components is 2 cm; the roller 9 in the resistance reducing component is made of plastics. The number of the resistance reducing components is two. The central angle of the axes of two adjacent connecting rods 6 corresponding to the section of the bearing disc 4 is 45 degrees. In the embodiment, the steel ball 5 is a solid sphere and is prepared by the following method:
(A) mixing and sintering the components according to the following weight percentage to form balls, wherein iron powder, carbon powder, phosphorus powder and aluminum powder are mixed in a ratio of 6:2:1: 1;
(B) quenching; screening materials in layers according to the particle size;
(C) grinding in a ball mill for 30 min.
The preparation method of the embodiment comprises the following steps:
(a) prefabricating a bearing disc 4, an annular piston 2 and a resistance reducing body, wherein an annular opening is formed in the inner side wall of the piston 2, matching parts 201 matched with the two annular grooves are formed in the inner side wall of the annular piston 2, and the two matching parts 201 are respectively positioned on two sides of the opening; an accommodating cavity matched with the steel ball 5 is formed in the piston 2 and communicated with the opening;
(b) opening the opening on the inner side wall of the piston 2, and extruding the steel balls 5 into the containing cavities from the opening, so that one steel ball 5 is arranged in each containing cavity, and the outer surfaces of the steel balls 5 are bonded with the containing cavities;
(c) inserting the connecting rods 6 from the openings to enable each steel ball 5 to be fixedly connected with one connecting rod 6, then expanding the piston 2 from the annular interior, inserting one end, far away from the steel balls 5, of each connecting rod 6 into the force bearing disc 4, and enabling the matching part 201 of the piston 2 to be clamped in the corresponding annular groove;
(d) the resistance reducing bodies are fixed on the piston rod 3, so that a plurality of resistance reducing bodies form a group of resistance reducing assemblies to complete the fixation of the plurality of groups of resistance reducing assemblies;
(d) the completed piston rod 3 is inserted into the cylinder 1.
Preferably, the steel ball 5 is bonded to the accommodating cavity by the following method: before the steel balls 5 are placed in the containing cavity, 2-3 ml of adhesive is injected into the containing cavity, a layer of adhesive is uniformly coated on the surfaces of the steel balls 5, and then the steel balls 5 are extruded into the containing cavity.
Preferably, the connecting rod 6 is in threaded connection with the steel ball 5, the connecting rod 6 is connected with the bearing disc 4 through a quick connector, and the connecting rod 6 is abutted against the surface of the piston rod 3 when being inserted to the bottom.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. A bidirectional low-resistance injector comprises a needle cylinder (1), a piston (2) positioned in the needle cylinder (1) and a piston rod (3) connected with the piston (2), and is characterized in that one end of the piston rod (3) positioned in the needle cylinder (1) is fixedly connected with a bearing disc (4), and the axis of the piston rod (3) is collinear with the axis of the bearing disc (4); the piston (2) is annular, the piston (2) is sleeved outside the bearing disc (4), the outer side of the piston (2) is in contact with the inner wall of the needle cylinder (1), a plurality of annularly and uniformly distributed steel balls (5) are arranged in the annular piston (2), the steel balls (5) are connected with the piston rod (3) through a connecting rod (6) penetrating through the bearing disc (4), and the distance between the steel balls (5) and the inner wall of the needle cylinder (1) is 10% -20% of the inner diameter of the needle cylinder (1); the utility model discloses a cylinder (1) inner wall's structure, including piston rod (3), the piston rod (3) is gone up and is fallen along a plurality of groups of axial evenly distributed and hinder the subassembly, and every group falls to hinder the subassembly and includes that the body falls outside piston rod (3) along circumference annular equipartition and hinders the body, fall to hinder the body including two parallel to each other and just right mounting panel (7), the one end of mounting panel (7) is fixed on piston rod (3), the other end radially extends towards cylinder (1) inner wall direction along piston rod (3), fall between two internal mounting panel (7) fixed connection installation axle (8) of hindering, installation axle (8) are located mounting panel (7) and are close to the one end of cylinder (1) inner wall, set up gyro wheel (9) on installation axle (8), gyro wheel (9) can roll along the.
2. The bidirectional low-resistance syringe as claimed in claim 1, wherein the bearing disc (4) is provided with annular grooves facing each other on both side surfaces, the annular grooves are concentric with the bearing disc (4), the height of the inner side wall of each annular groove is greater than that of the outer side wall, the inner side wall of the annular piston (2) is provided with a matching part (201) matched with the two annular grooves, and the matching part (201) is clamped in the annular grooves.
3. The bidirectional low-resistance syringe as claimed in claim 1, wherein the bearing disc (4), the piston rod (3) and the syringe (1) are all made of plastics, and the bearing disc (4) and the piston rod (3) are integrally formed; the piston (2) is a rubber plug.
4. The bidirectional low-resistance injector according to claim 1, wherein the distance between two adjacent resistance-reducing components is 1-2 cm; the roller (9) in the resistance reducing component is made of plastics.
5. The bidirectional low drag syringe of claim 1 wherein there are at least two of said drag reducing assemblies.
6. The bidirectional low-resistance syringe as claimed in claim 1, wherein the central angle of the axes of two adjacent connecting rods (6) corresponding to the cross section of the force bearing disk (4) is 45 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822272108.2U CN210542707U (en) | 2018-12-29 | 2018-12-29 | Bidirectional low-resistance syringe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822272108.2U CN210542707U (en) | 2018-12-29 | 2018-12-29 | Bidirectional low-resistance syringe |
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| Publication Number | Publication Date |
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| CN210542707U true CN210542707U (en) | 2020-05-19 |
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| CN201822272108.2U Active CN210542707U (en) | 2018-12-29 | 2018-12-29 | Bidirectional low-resistance syringe |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109481788A (en) * | 2018-12-29 | 2019-03-19 | 四川普瑞斯生物科技有限公司 | A kind of two-way injection with low resistance and preparation method thereof |
-
2018
- 2018-12-29 CN CN201822272108.2U patent/CN210542707U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109481788A (en) * | 2018-12-29 | 2019-03-19 | 四川普瑞斯生物科技有限公司 | A kind of two-way injection with low resistance and preparation method thereof |
| CN109481788B (en) * | 2018-12-29 | 2023-09-26 | 四川普瑞斯生物科技有限公司 | Bidirectional low-resistance injector and preparation method thereof |
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