RU169008U1 - Retractable safety syringe with selective trigger - Google Patents

Abstract

This utility model relates to a medical device, and mainly relates to a retractable safety syringe with a selective trigger mechanism, comprising: a hollow body, a central shaft, a piston, a needle matching device and a blocking body part, wherein the blocking body part is made of elastic polymer material, the hollow body is equipped with a mounting groove, a large sealing ring and a zero line, the central shaft is equipped with a tensioning protrusion and a plate, matching device the needle holder is provided with an annular mounting protrusion, an internal sealing ring and a retracting ring, the blocking body part is provided with a sealing plate, a sealing coil element, a mounting ring and a stopper. The sealing plate and the large sealing ring, the sealing coil element and the inner sealing ring are tightly fitted relative to each other to form respectively sealing structures. When the adjusting ring interacts with the tensioning protrusion, and then it is pulled off by the central shaft, the matching device for the needle is pulled with it into the hollow body by fitting the sealing coil element and the pulling ring. A stopper may be inserted into the internal cavity in the annular mounting protrusion of the needle matching device to secure the annular mounting protrusion in the mounting groove of the hollow body. As a result, the blocking housing part is configured to perform three functions and simplify

Description

FIELD OF TECHNOLOGY

This utility model relates to a medical device, in particular to a retractable safety syringe with a selective trigger.

BACKGROUND

A syringe is a type of medical device that is most often used in a clinic, and currently a plastic disposable syringe is most commonly used. Despite the fact that a disposable syringe is already effectively coping with the problem of cross-infection, the concept of unidirectional protection has become outdated with the development of mankind. A needle that is contaminated with a patient’s blood while using a syringe can cause harm to users. Defective syringes can additionally lead to accidental damage to workers in the sequence of procedures, such as storage, transportation and destruction. A safe syringe, which is a medical device with the concept of multilateral protection, is made with the possibility of protection against cross infection not only for patients, but also for a medical worker who can use it, as well as a worker who may come into contact with this syringe after use, from damage dirty needles.

Currently, there are many products and patents regarding a manually retractable safety syringe, such as CN 100443130 C, CN 103330976 B, US 9155845 B2, US 8562561 B2, JP 2008-525059, JP 2012-86057, etc. Some of them have a complex structure, in particular, several of them contain more than seven components and cannot be produced on a large scale, so the cost of their production is too high, standard needles are not suitable for some, and the needle cannot be replaced, some solve the problem of sealing by means of an o-ring that is too small to be mechanized to assemble, some cannot be reused because the safety mechanism The ism will start when the plunger is advanced towards the distal end, and most of them do not have the function of selectively triggering the safety mechanism.

Section 3.1 of the international standard ISO 7886-4 “Single use sterile injectable syringes - Part 4: Syringes with a device preventing their reuse” suggests a requirement according to which users can, at their own discretion, start the safety mechanism. This utility model satisfies this requirement.

DISCLOSURE

The solution to this real utility model is as follows: create a safe syringe that can be selectively started and in which the needle is manually retracted.

Achieved:

the presence of only five simple and inexpensive components, as well as providing the possibility of implementing mechanized mass production,

using a standard needle that can be replaced,

providing the possibility of air release to the zero line, as well as providing the possibility of reuse, the possibility of starting the safety mechanism after the needle is removed from the human body, as well as ensuring a complete understanding that users can decide at their discretion when to start the safety mechanism,

that a contaminated needle can be drawn in to protect it in a syringe, and the problem of getting injured by an injection is solved.

This syringe contains only five components, so that the needle can be secured and leakage can be eliminated. In addition, users can decide at their own discretion when to start the safety mechanism.

In order to solve the above problems, this utility model offers the following solution:

A retractable safety syringe with a selective trigger, comprising:

a hollow body having a cylindrical shape,

a central rod configured to move in a hollow body,

a piston mounted on a central shaft,

a matching device for the needle, made with the possibility of sliding movement and installed in front of the hollow body, and

a blocking body part configured to mount a matching device for the needle on the hollow body and with the possibility of forming a sealing structure together with the hollow body and matching device for the needle,

wherein the locking body part is further configured to interact with the central shaft and retract into the hollow body by pulling the central shaft,

the blocking body part is made of an elastic polymer material,

the hollow body is equipped with an installation groove, a large sealing ring and a zero line,

the central rod is equipped with a tension ledge and a plate,

the matching device for the needle is equipped with an annular mounting protrusion, an internal sealing ring and a pulling ring,

the blocking body part is provided with a sealing plate, a sealing coil element, a mounting ring and a stopper,

the sealing plate and the large sealing ring of the hollow body are tightly fitted relative to each other to form the sealing structure A, the sealing coil element and the inner sealing ring are tightly mounted relative to each other to form the sealing structure B,

the sealing coil element is arranged to fit into the retracting ring so as to pull the matching device for the needle to ensure its retraction,

the installation ring is made with the possibility of interaction with the tensioning protrusion of the Central rod and with the possibility of traction in order to pull it in,

the limiter is arranged to be inserted into the internal cavity in the annular mounting protrusion of the needle matching device, whereby the annular mounting protrusion is fixed in the mounting groove of the hollow body.

In addition, a retractable safety syringe with a selective trigger may also have the following symptoms:

the polymeric material is a thermoplastic elastomer, natural rubber or synthetic rubber.

In addition, a retractable safety syringe with a selective trigger may also have the following symptoms:

when the zero line of the hollow body and the front of the piston seal line overlap with each other,

the gap, the offset value of the trigger mechanism of which is L, between the front end surface of the plate in the Central rod and the lower end surface of the piston is predefined,

the gap, the offset value of the trigger mechanism of which is L, between the lower end surface of the tensioning protrusion in the Central rod and the front end surface of the installation ring in the blocking housing parts are also predefined.

In addition, a retractable safety syringe with a selective trigger may also have the following symptoms:

the mounting groove of the hollow body is an annular groove and is configured to interact with the ring mounting protrusion of the matching device for the needle,

after the stopper of the locking body part is inserted into the inner cavity of the annular mounting protrusion, the matching device for the needle is tightly fixed to the hollow body,

after the stopper of the locking body part is removed from the inner cavity of the annular mounting protrusion, the annular mounting protrusion is reduced, and then it is possible to smoothly enter the inner cavity of the hollow body.

In addition, a retractable safety syringe with a selective trigger may also have the following symptoms:

the large o-ring of the hollow body and the sealing plate of the locking body part by interference fit make up the sealing structure A,

the sealing coil element in front of the locking body part and the inner sealing ring of the matching device for the needle by means of an interference fit constitute the sealing structure B,

the sealing structure A and the sealing structure B maintain the airtightness of the hollow body.

In addition, a retractable safety syringe with a selective trigger may also have the following symptoms:

the tension protrusion of the Central rod is made with the possibility of stretching or contraction,

when stretching the tension ledge, the outer diameter of the tension ledge becomes larger than the inner diameter of the mounting ring of the locking body part,

after passing through the mounting ring, the tension projection is stretched and stuck on the front end surface of the mounting ring so that it is now possible to pull the center rod of the blocking housing so that it moves into the hollow body.

In addition, a retractable safety syringe with a selective trigger may also have the following symptoms:

at least two trigger rods are evenly distributed along the radial direction on the front end surface of the plate in the Central rod, and the height of the trigger rod is equal to a predetermined value L of the offset trigger mechanism

when the central rod moves forward, it is possible to stop the starting rod in the lower end face of the piston in order to introduce it.

In addition, a retractable safety syringe with a selective trigger may also have the following symptoms:

the launch rod has a cross-sectional shape, which is a circle, rectangle or triangle.

In addition, a retractable safety syringe with a selective trigger may also have the following symptoms:

the total estimated area of the starting thrust on the plate is less than the area of the plate.

In addition, a retractable safety syringe with a selective trigger may also have the following symptoms:

when the central rod is acted upon by the axial force of the trigger mechanism, the trigger rod moves toward the lower end surface of the piston, wedges into the piston, and then moves to a distance of a predetermined offset value L of the trigger mechanism so that after passing through the adjusting ring, the tension protrusion stretches and subsequently gets stuck on the front end surface of the mounting ring so that the central shaft and the blocking housing Al is blocked to form a whole, resulting in a trigger safety mechanism safety syringe.

In addition, a retractable safety syringe with a selective trigger may also have the following symptoms:

annular mounting protrusions are represented in the amount of two or more pieces and are evenly distributed along the radial direction.

The technical result of this utility model.

After in the syringe with the aforementioned design, the annular installation protrusion mounted on the matching device for the needle interacted with the installation groove in the front of the hollow body, the annular installation protrusion, after inserting the lock of the blocking part into its internal cavity, will become stuck and will not be able to contract inward, as a result of which the matching device for the needle will be tightly fixed to the hollow body.

The large sealing ring of the hollow body and the sealing plate of the locking body part by interference fit constitute the sealing structure A, and the sealing coil element at the front of the locking body part and the inner sealing ring of the matching device for the needle by means of interference fit constitute the sealing structure B. Two sealing structures made with the possibility of solving the problem of sealing the hollow body and ensuring the absence of leaks of the syringe p and its use.

Since the blocking body part is capable of performing three functions, which include fixing the matching device for the needle, forming sealing structures A and B, and also pulling the matching device to retract it, it implements three goals and reduces the number of components. In addition, the blocking body part is made of an elastic polymer material, so that the formed sealing structures are reliable.

When the central shaft actuates the piston and pushes the front of the piston seal line so that it moves to overlap with the zero line of the hollow body, which means that the fluid in the hollow body is completely inserted, in the blocking body part between the tension projection of the central shaft and there is still a distance L by the front of the locating ring. Thus, the central shaft and the blocking body part are still not locked to form a single unit, and the blocking body the item can not be geared to the implementation of its retraction. Thus, the syringe will not be disabled by pulling the central rod and can perform operations to repeatedly remove air and introduce fluid.

When the medical worker makes an introduction and decides that the syringe is no longer needed, he can apply an effort to the axial section of the central rod so that the trigger rod on the central rod plate wedges into the piston and then moves forward to the distance L. Thus thus, the tensioning protrusion will pass through the mounting ring of the blocking housing, and then will be able to reach the front end surface of the mounting ring. Since the outer diameter of the tension projection is larger than the internal diameter of the locating ring on the blocking body part, the tension projection will block the central shaft and the blocking body part to form a single unit. When the central shaft is pulled into the hollow body, the central shaft can also bring the locking body part back into the hollow body, as a result of which the annular mounting protrusion is released from restriction on the side of the needle matching device. The central shaft can be pulled out to continuously bring the locking body part back. When the sealing coil element of the locking body part engages the pull ring of the needle matching device, the needle matching device that has been released from the restriction is pulled into the hollow body as a result. As a result, the needle attached to the matching device for the needle is pulled back to protect it in the hollow body. Thus, the needles contaminated with the blood of patients will no longer cause damage.

Thus, the requirement made in the international standard ISO 7886-4 can be fulfilled that the safety mechanism of safe syringes must be started selectively, and a contaminated needle must be protected.

BRIEF DESCRIPTION OF THE DRAWINGS

In FIG. 1 shows an illustration of the state of a retractable safety syringe with a selective trigger that is not used after final assembly in this utility model.

In FIG. 2 is a cross-sectional view of a hollow body in the present utility model.

In FIG. 3 shows an illustration of a central rod in the present utility model.

In FIG. 4 shows a sectional view of a central rod along the CC line in the present utility model.

In FIG. 5 is a cross-sectional view of an alignment device for a needle in the present utility model.

In FIG. 6 is a cross-sectional view of a blocking body part in the present utility model.

In FIG. 7 is a sectional view of a piston in the present utility model.

In FIG. 8 is an illustration of a state of a safety mechanism that does not start after use in the present utility model.

In FIG. 9 is an illustration of a state of a safety mechanism that is not triggered in the present utility model.

In FIG. 10 is an illustration of a state in which the starting rod has wedged into the piston when the safety mechanism in the present utility model is started.

In FIG. 11 is an illustration of a state in which a needle was retracted into a hollow body after a syringe was used in the present utility model.

In FIG. 12 shows a graph of the relationship between the displacement value and the axial force with a starting thrust width of 0.5 mm in the present utility model.

In FIG. 13 shows a graph of the relationship between the displacement value and the axial force with a starting thrust width of 0.8 mm in the present utility model.

In FIG. 14 is a graph of the relationship between the displacement value and the axial force with a starting thrust width of 1 mm in the present utility model.

The following notation is used in the figures:

1 - hollow body, 2 - central rod, 21 - tension ledge, 22 - plate, 222 - starting rod, 3 - piston, 31 - front of the seal line, 32 - lower end surface, 4 - matching device for the needle, 41 - an annular mounting protrusion, 411 - an internal cavity, 42 - an internal sealing ring, 43 - a retracting ring, 5 - a blocking housing part, 51 - a sealing plate, 52 - a sealing coil element, 53 - a mounting ring, 531 - front end surface, 54 - limiter.

IMPLEMENTATION OF A USEFUL MODEL

Safe Syringe Implementation Option

As shown in FIG. 1, the retractable safety syringe with a selective trigger mechanism comprises: a hollow body 1, which has a cylindrical shape, a central shaft 2, which is movable in the hollow body 1, a piston 3, which is mounted on the central shaft 2, a matching device 4 for the needle, which is made with the possibility of sliding movement and installed in front of the hollow body 1, blocking the body part 5, which is made with the possibility of installing the matching device 4 for the needle on the hollow body 1 and with ozhnostyu formation of a seal structure together with the hollow body 1 and matching device 4 to the needle. The blocking housing 5 is adapted to interact with the central shaft 2 and can be retracted into the hollow body 1 by pulling the central rod 2. The blocking housing 5 is made of an elastic polymer material.

As shown in FIG. 1, FIG. 2, FIG. 3, FIG. 4, FIG. 5 and FIG. 6, the hollow body 1 is provided with a mounting groove 11, a large sealing ring 12 and a zero line 13. The central shaft 2 is provided with a tensioning protrusion 21 and a plate 22. The matching device 4 for the needle is equipped with an annular mounting protrusion 41, an inner sealing ring 42 and a pull ring 43. The blocking housing part 5 is provided with a sealing plate 51, a sealing coil element 52, a mounting ring 53 and a stopper 54.

The sealing plate 51 and the large sealing ring 12 in the hollow body 1 are tightly fitted relative to each other to form the sealing structure A, and the sealing coil element 52 and the inner sealing ring 42 are tightly mounted relative to each other to form the sealing structure B.

The sealing coil element 52 can be fitted under the pull ring 43 so as to allow the mating device 4 to be pulled to retract it.

The mounting ring 53 is configured to interact with the tensioning protrusion 21 of the Central rod 2 and with the possibility of its subsequent traction to ensure its retraction inward.

The stopper 54 can be inserted into the inner cavity 411 in the annular mounting protrusion 41 of the needle matching device 4, whereby the annular mounting protrusion 41 is fixed in the mounting groove 11 of the hollow body 1.

As shown in FIG. 1 and FIG. 6, the blocking body part 5 is made of an elastic polymer material. The polymeric material may be a thermoplastic elastomer, natural rubber or synthetic rubber.

As shown in FIG. 1, FIG. 2, FIG. 3, FIG. 6, FIG. 7 and FIG. 8, when the zero line 13 of the hollow body 1 and the front seal line 31 of the piston 3 overlap with each other, the gap, the offset value of the trigger mechanism of which is L, between the front end surface 221 of the plate 22 in the central shaft 2 and the lower end surface 32 of the piston 3 is preliminarily the gap is set, the trigger offset value of which is L, between the lower end surface 211 of the tension projection 21 in the central shaft 2 and the front end surface 531 of the mounting ring 53 in the blocking housing Details 5 th as previously set.

As shown in FIG. 1, FIG. 2, FIG. 5 and FIG. 6, the mounting groove 11 of the hollow body 1 is an annular groove and is configured to interact with the annular mounting protrusion 41 of the needle matching device 4.

After the stopper 54 of the locking body part 5 is inserted into the inner cavity 411 of the annular mounting protrusion 41, the matching needle device 4 can be tightly fixed to the hollow body 1.

After the stopper 54 of the locking body part 5 is removed from the inner cavity 411 of the annular mounting protrusion 41, the annular mounting protrusion 41 is reduced, and then it will be possible to smoothly enter the inner cavity of the hollow body 1.

As shown in FIG. 1, FIG. 2, FIG. 5 and FIG. 6, the large sealing ring 12 of the hollow body 1 and the sealing plate 51 of the locking body part 5 by interference fit make up the sealing structure A, the sealing coil element 52 at the front of the locking body part 5 and the inner sealing ring 42 of the needle matching device 4 by fitting with tightness make up the sealing structure B. The sealing structure A and the sealing structure B are configured to maintain airtightness of the hollow body mustache 1.

As shown in FIG. 1, FIG. 3 and FIG. 6, the tension projection 21 of the central shaft 2 is configured to stretch or contract. When the tensioning protrusion 21 is stretched, the outer diameter of the tensioning protrusion 21 becomes larger than the inner diameter of the mounting ring 53 of the locking body 5, so that after passing through the mounting ring 53, the tensioning protrusion 21 is stretched and stuck on the front end surface 531 of the mounting ring 53. Thus, it is possible to carry out traction by the central shaft 2 of the blocking body part 5 so that it moves into the hollow body 1.

As shown in FIG. 1, FIG. 3, FIG. 4 and FIG. 7, at least two trigger rods 222 are evenly distributed along a radial direction on the front end surface 221 of the plate 22 in the central shaft 2, and the height of the trigger rod 222 is equal to a predetermined offset value L of the trigger mechanism. When the central shaft 2 moves forward, the starter rod 222 can abut against the lower end surface 32 of the piston 3 so as to introduce it.

In FIG. 4 shows four launch rods 222. The cross-sectional shape of the launch rod 222 may be a circle, a rectangle, or a triangle, and in the present embodiment, the preferred shape is a rectangle. The total estimated area of the starting thrust 222 on the plate 22 is less than the area of the plate 22. In the present embodiment, the area ratio is preferably 1: 10-1: 30 and 1:15.

As shown in FIG. 1, FIG. 3, FIG. 4, FIG. 6, FIG. 7 and FIG. 9, when the central shaft 2 is acted upon by the axial force of the trigger mechanism, the trigger rod 222 moves toward the lower end surface 32 of the piston 3, wedges into the piston 3, and then moves a distance of a predetermined offset value L of the trigger mechanism. Thus, after passing through the adjusting ring 53, the tensioning protrusion 21 is stretched and subsequently stuck on the front end surface 531 of the adjusting ring 53. Thus, the central shaft 2 and the blocking body part 5 are blocked to form a single unit, as a result of which the safety mechanism of the syringe.

As shown in FIG. 1 and FIG. 5, the annular mounting protrusions 41, the number of which is more than two, are uniformly distributed along the radial direction. In the present embodiment, preferably there are four annular mounting tabs 41.

As shown in FIG. 1, FIG. 2, FIG. 5 and FIG. 6, the annular mounting protrusion 41 mounted on the matching device 4 for the needle interacts with the installation groove 11 in the front of the hollow body 1 and is configured to block the annular mounting protrusion 41 so as to prevent it from contracting inward after the stop 54 of the locking body part 5 is inserted into the inner cavity 411 of the annular mounting protrusion 41. Thus, the matching needle device 4 is tightly fixed to the hollow body 1.

As shown in FIG. 1, FIG. 2, FIG. 3, FIG. 5 and FIG. 6, the large sealing ring 12 of the hollow body 1 and the sealing plate 51 of the locking body part 5 by interference fit make up the sealing structure A, the sealing coil element 52 at the front of the locking body part 5 and the inner sealing ring 42 of the needle matching device 4 by fitting with tightness make up the sealing structure B. Two sealing structures are made with the possibility of solving the problem of sealing the hollow body 1 and ensure the absence of ek syringe during use.

Since the blocking housing part 5 is configured to perform three functions, which consist in fixing the matching device 4 for the needle, forming the sealing structure A and the sealing structure B, as well as in pulling off the matching device 4 for the needle to allow it to be retracted, the locking body part 5 implements three goals and reduces the number of components. In addition, the blocking housing 5 is made of an elastic polymer material, so that the formed sealing structures are reliable.

As shown in FIG. 1, FIG. 2, FIG. 3, FIG. 5, FIG. 6, FIG. 7, FIG. 9, FIG. 10 and FIG. 11, when the central shaft 2 actuates the piston 3 and pushes the front of the seal line 31 of the piston 3 so that it moves to overlap with the zero line 13 of the hollow body 1, which means that the liquid in the hollow body 1 is completely introduced, there is still a distance L between the tensioning protrusion 21 of the central shaft 2 and the front of the mounting ring 53 in the blocking body part 5. Thus, the central shaft 2 and the blocking body part 5 are still not blocked to form a single whole, and the blocking body part 5 cannot be engaged to retract it. Thus, the syringe will not be disabled by pulling the Central rod 2, and it will be possible to perform operations of repeated removal of air and the introduction of fluid.

When the medical worker completes the next injection and decides that the syringe is no longer needed, he can apply a force to the axial section of the central shaft 2 so that the trigger rod 222 on the plate 22 of the central shaft 2 wedges into the piston 3 and then moves in the direction forward by a distance L. Thus, the tensioning protrusion 21 will pass through the installation ring 53 of the blocking housing 5, and then will be able to reach the front end surface 531 of the installation ring 53. Since the outer diameter of the tension Foot projection 21 larger than the inner diameter of the mounting ring 53 of the blocking of the housing part 5, the tensioning projection 21 will lock core rod 2 and the locking base member 5 to form a single whole. When the central shaft 2 is pulled into the hollow body 1, the central shaft 2 can bring the blocking body part 5 back into the hollow body 1, and thus also release the annular mounting protrusion 41 from the restriction 4 for the needle. The central shaft 2 can be pulled to continuously bring the locking housing 5 back. When the sealing turn element 52 of the locking body part 5 engages the pull ring 43 of the needle matching device 4, which has been released from restriction, this needle matching device 4 is pulled into the hollow body 1. As a result, the needle fixed to the needle matching device 4 are pulled back to protect it in the hollow body 1. Thus, a needle that is contaminated with the blood of patients will no longer cause damage.

The state of the syringe during use in the present embodiment is shown in FIG. 1. The needle (not shown in the figure) is mounted on a matching device 4 for the needle. The central rod 2 can be pulled out to suck in the liquid and remove air, and can also be advanced to the end in order to introduce it (Fig. 8). Since the tensioning protrusion 21 of the central shaft 2 has not passed through the blocking body part 5 and is not stuck outside the blocking body part 5, the central shaft 2 can be pulled out and reinsertion can be performed. It may also be decided to pull the syringe out of the human body, and a radial force can be applied to the central shaft 2 so as to allow the central shaft 2 to move forward in the direction L. Thus, the safety mechanism will be started (Fig. 9), and the central shaft 2 and the locking body part 5 are locked to form a single unit. The central shaft 2 can be continuously pulled back so that it pulls and protects the needle matching device 4, together with the needle connected thereto, into the hollow body 1, as shown in FIG. eleven.

A safe syringe can be used repeatedly if it was not decided to start its safety mechanism. And the choice of a trigger in a laboratory setting can prevent pain for patients, which can be caused by oscillating the needle during the start of the safety mechanism.

Thus, this safe syringe is made with the possibility of implementing the international standard ISO 7886-4. The safety mechanism can be triggered selectively, and a contaminated needle can be drawn into the hollow body 1 for complete protection so as to prevent damage from a needle prick. The locking body part 5 is configured to perform the function of fixing the matching device 4 for the needle, and also with the possibility of forming reliable sealing structures with the corresponding part of the matching device 4 for the needle and the hollow body 1, respectively, in addition, it is configured to perform the function of pulling the matching device 4 for a needle and a needle connected to a matching device 4 for the needle so that they are pulled into the hollow body 1, as a result of which the locking body part 5 It implements three goals and reduces the number of components. Thus, the entire structure is simplified, and production costs can be reduced. For the formation of the sealing structure do not use an O-ring, therefore, machine production can be easily implemented.

Launch traction options

A retractable safety syringe with a selective trigger with a 5 ml scale is considered as an example for explanation. Four starting rods are mounted on a central rod plate, which has a rectangular shape (shown in Fig. 4). The size of each rod: length × height = 2 × 1 mm.

The first implementation option

A table of the relationship between the displacement value and the axial force is shown below with a starting rod width of 0.5 mm, and a curved relationship is shown in FIG. 12.

Second implementation option

A table of the relationship between the displacement value and the axial force is shown below with a start thrust width of 0.8 mm, and a curved relationship is shown in FIG. 13.

Third implementation option

A table of the relationship between the displacement value and the axial force with a starting rod width of 1 mm is shown below, and a curved relationship is shown in FIG. fourteen.

The implementation options given above are simply the preferred options for implementing the present utility model rather than limiting the scope of protection, so any equivalent change in accordance with the design, form or nature of the present utility model does not go beyond the protection scope of the present utility model.

Claims (41)

1. Retractable safety syringe with selective trigger, containing: a hollow body (1) having a cylindrical shape, the Central rod (2), made with the possibility of movement in the hollow body (1), a piston (3) mounted on a central shaft (2), matching device (4) for the needle, made with the possibility of sliding movement and installed in front of the hollow body (1), and a blocking body part (5) configured to fit a matching device (4) for the needle on the hollow body (1) and forming a sealing structure together with the hollow body (1) and the matching device (4) for the needle, moreover, the blocking housing part (5) is further configured to interact with the central shaft (2) and retract into the hollow body (1) by pulling the central shaft (2), the blocking body part (5) is made of an elastic polymer material, the hollow body (1) is provided with a mounting groove (11), a large o-ring (12) and a zero line (13), the central rod (2) is provided with a tensioning protrusion (21) and a plate (22), the matching device (4) for the needle is equipped with an annular mounting protrusion (41), an internal sealing ring (42) and a pull ring (43), the blocking body part (5) is provided with a sealing plate (51), a sealing coil element (52), a mounting ring (53) and a stop (54), the sealing plate (51) and the large sealing ring (12) of the hollow body (1) are tightly fitted relative to each other to form the sealing structure A, and the sealing coil element (52) and the internal sealing ring (42) are tightly mounted relative to each other to form the sealing construction B the sealing coil element (52) is arranged to fit into a pull ring (43) for pulling the matching device (4) to retract it, the installation ring (53) is made with the possibility of interaction with the tensioning protrusion (21) of the Central rod (2) and its traction for drawing it in, the limiter (54) is arranged to be inserted into the inner cavity (411) in the annular mounting protrusion (41) of the matching device (4) for the needle, as a result of which the annular mounting protrusion (41) is fixed in the mounting groove (11) of the hollow body (1) . 2. Retractable safety syringe with a selective trigger according to claim 1, wherein the polymeric material is a thermoplastic elastomer, natural rubber or synthetic rubber. 3. A retractable safety syringe with a selective trigger according to claim 1, wherein when the zero line (13) of the hollow body (1) and the front line (31) of the piston seal (3) overlap each other, the gap, the offset value of the trigger mechanism of which is L, is predefined between the front end surface (221) of the plate (22) in the central shaft (2) and the lower end surface (32) of the piston (3), the gap, the trigger offset of which is L, is also pre-set between the lower end surface (211) of the tension projection (21) in the central shaft (2) and the front end surface (531) of the mounting ring (53) in the blocking housing (5) . 4. Retractable safety syringe with a selective trigger according to claim 1, in which the mounting groove (11) of the hollow body (1) is an annular groove and is configured to interact with the annular mounting protrusion (41) of the matching device (4) for the needle, after inserting the stopper (54) of the blocking body part (5) into the inner cavity (411) of the annular mounting protrusion (41), the matching device (4) for the needle is tightly fixed to the hollow body (1), after removing the stopper (54) of the blocking body part (5) from the inner cavity (411) of the annular mounting protrusion (41), the annular mounting protrusion (41) is reduced, while it is possible to smoothly enter the inner cavity of the hollow body (1). 5. Retractable safety syringe with a selective trigger according to claim 1, in which the large sealing ring (12) of the hollow body (1) and the sealing plate (51) of the blocking body part (5) form a sealing structure A by interference fit the sealing coil element (52) in the front of the locking body part (5) and the inner sealing ring (42) of the needle matching device (4) form the sealing structure B by interference fit the sealing structure A and the sealing structure B are configured to maintain airtightness of the hollow body (1). 6. Retractable safety syringe with a selective trigger according to claim 1, in which the tension protrusion (21) of the Central rod (2) is made with the possibility of stretching or contraction, when stretching the tension ledge (21), the outer diameter of the tension ledge (21) becomes larger than the inner diameter of the mounting ring (53) of the blocking body part (5), after passing through the installation ring (53), the tension projection (21) is stretched and stuck on the front end surface (531) of the installation ring (53) in such a way that it is possible to pull the central rod (2) of the blocking body part (5) so that so that it moves into the hollow body (1). 7. Retractable safety syringe with a selective trigger according to claim 1, in which at least two trigger rods (222) are evenly distributed along the radial direction on the front end surface (221) of the plate (22) in the central shaft (2), and the height of the trigger rod (222) is equal to the preset trigger offset L, when the central rod (2) moves forward, it is possible to stop the trigger rod (222) in the lower end surface (32) of the piston (3) for the introduction. 8. A retractable safety syringe with a selective trigger according to claim 1 or 7, wherein the trigger rod (222) has a cross-sectional shape that is a circle, rectangle or triangle. 9. Retractable safety syringe with a selective trigger according to claim 8, in which  the total estimated area of the starting thrust (222) on the plate (22) is less than the area of the plate (22). 10. Retractable safety syringe with selective trigger according to paragraphs. 1, 7 or 9, in which, when the central rod (2) is acted upon by the axial force of the trigger mechanism, the trigger rod (222) moves towards the lower end surface (32) of the piston (3), wedges into the piston (3), and then it moves to the distance of the pre-set value L of the bias of the trigger mechanism, thus, after passing through the adjusting ring (53), the tension projection (21) is stretched and subsequently gets stuck on the front end surface (531) of the adjusting ring (53), resulting in a central the second rod (2) and the blocking body part (5) are blocked with the formation of a single whole, as a result of which it is possible to start the safety mechanism of a safe syringe. 11. Retractable safety syringe with a selective trigger according to claim 1, wherein the annular mounting protrusions (41) are presented in an amount of two or more pieces and are evenly distributed along the radial direction.

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