A negative pressure syringe that can be used to aspirate joint fluid with one hand

Abstract

This application provides a negative pressure syringe for single-handed aspiration of joint effusion. The negative pressure syringe includes: a syringe needle, a syringe barrel, and a syringe plunger. A shut-off valve is provided between the syringe needle and the syringe barrel. The shut-off valve can be controlled to allow communication or closure between the syringe needle and the syringe barrel. The syringe plunger is provided with a negative pressure fixing structure, which is used to fix the syringe plunger after pulling it from inside the syringe barrel when the shut-off valve is closed, thereby creating a negative pressure environment inside the syringe barrel. This application has a simple structure, is easy to manufacture, and is easy to operate, making it convenient for users to aspirate joint effusion. It can help clinicians to fully and accurately aspirate joint fluid and other intracavitary fluids, improving clinical efficiency and reducing the risk of clinical errors.

Description

Technical Field

[0001] This application relates to the field of syringe technology, specifically to a negative pressure syringe that can be used to extract joint effusion with one hand. Background Technology

[0002] Existing conventional syringes require force to pull the push-pull lever when aspirating joint fluid (such as synovial fluid, cyst fluid, abscess fluid, peritoneal effusion, etc.). Due to the complex environment within the joint cavity, prolonged operation during fluid aspiration can easily cause muscle fatigue for clinicians, increasing the risk of clinical errors. For example, the authorized patent "A Medical Syringe for Convenient Fluid Aspiration" (Patent No.: ZL2017 2 0548984.6) still requires one hand to hold the syringe barrel 9 and the other hand to operate the lever 3. Furthermore, the locking piece 11 is a separate design and requires matching parts. Additionally, one hand is still needed to open the sealing valve, and since the syringe itself is relatively light, using two hands can easily lead to errors. Moreover, the stop plate of this syringe requires a separate piece to be secured in the recess of the push rod, which is prone to detachment, affecting the effectiveness of use.

[0003] Therefore, there is an urgent need for a syringe or needle that can be operated with one hand to extract joint effusion using a push-pull lever. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the technical problem to be solved by this application is to provide a negative pressure needle that can be used to extract joint effusion with one hand, so as to solve at least one problem in the prior art.

[0005] To achieve the above and other related objectives, this application provides a negative pressure syringe for single-handed aspiration of joint effusion. The negative pressure syringe includes: a syringe needle, a syringe barrel, and a syringe plunger; a shut-off valve is provided between the syringe needle and the syringe barrel; the shut-off valve is controlled to allow communication or closure between the syringe needle and the syringe barrel; a negative pressure fixing structure is provided on the syringe plunger, which is used to fix the syringe plunger after pulling it from inside the syringe barrel when the shut-off valve is closed, so as to create a negative pressure environment inside the syringe barrel.

[0006] In one embodiment of this application, the shut-off valve includes: a conical shut-off block, a shut-off block control component, an upper connecting sleeve connected to the syringe barrel, and a lower connecting sleeve connected to the syringe needle; the conical shut-off block is adapted to be fitted with a rubber sealing block; the shut-off block control component is used to manually control the conical shut-off block to move axially along the shut-off valve, so that the conical surface of the conical shut-off block disengages from or engages with the upper connecting sleeve, thereby realizing communication or closure between the syringe needle and the syringe barrel.

[0007] In one embodiment of this application, the conical surface of the conical stop block faces the syringe barrel.

[0008] In one embodiment of this application, the stop block control component is a spiral stop rod; the spiral stop rod passes through the conical stop block and the rubber sealing block; a slit groove is provided on the side wall of the stop valve for the spiral stop rod to rotate; the slit groove has a certain inclination angle with the vertical plane of the axial direction of the stop valve; the circumference of the slit groove is smaller than the circumference of the stop valve, but larger than half the circumference of the stop valve; force-bearing platforms are provided at both ends of the spiral stop rod that pass through the stop valve to increase the force-bearing area and facilitate operation; by rotating the spiral stop rod with two fingers of one hand, the conical stop block and the rubber sealing block are moved along the axial direction of the stop valve, so that the conical surface of the conical stop block disengages from or engages with the upper connecting sleeve, thereby realizing the communication or closure between the syringe needle and the syringe barrel.

[0009] In one embodiment of this application, the stop block control component is a ball valve; the ball valve is placed between the conical stop block and the upper connecting sleeve, and by pressing or releasing the outer wall of the stop valve, the ball valve moves toward the center or edge of the stop valve, thereby causing the conical surface of the conical stop block to disengage from or engage with the upper connecting sleeve, so as to realize the communication or closure between the syringe needle and the syringe barrel.

[0010] In one embodiment of this application, the stop block control component is a lever; the lever passes through the side wall of the stop valve and is placed between the conical stop block and the upper connecting sleeve. Using the side wall of the stop valve as a fulcrum, the conical stop block is disengaged from or engaged with the upper connecting sleeve by pressing or releasing the lever, thereby achieving communication or closure between the syringe needle and the syringe barrel.

[0011] In one embodiment of this application, the stop block control is a deformable key; when not pressed, the deformable key is in the shape of a straight line and is placed between the conical stop block and the upper connecting sleeve; when the deformable key is pressed, the end of the deformable key abuts against the conical stop block and deforms into a rhombus shape, thereby causing the conical stop block to disengage from the upper connecting sleeve.

[0012] In one embodiment of this application, the negative pressure fixing structure provided on the syringe plunger is a detachable clip; the clip is integrally injection molded into a matching clip hole through point connection; after pulling the syringe plunger from the syringe barrel, the clip is bent and placed perpendicular to the clip hole to restrict the syringe plunger from moving towards the syringe barrel due to the negative pressure.

[0013] As described above, this application discloses a negative pressure needle for single-handed aspiration of joint effusion. The negative pressure needle includes: a syringe needle, a syringe barrel, and a syringe plunger. A shut-off valve is provided between the syringe needle and the syringe barrel. The shut-off valve is controlled to allow communication or closure between the syringe needle and the syringe barrel. A negative pressure fixing structure is provided on the syringe plunger, which is used to fix the syringe plunger after pulling it from inside the syringe barrel when the shut-off valve is closed, so as to create a negative pressure environment inside the syringe barrel.

[0014] It has the following beneficial effects:

[0015] This application has a simple structure, is easy to manufacture and operate, and is convenient for users to extract joint effusion. It can help clinicians to fully and accurately extract intracavitary fluids such as joint fluid, improve clinical efficiency and reduce the risk of clinical errors. Attached Figure Description

[0016] Figure 1 The diagram shows a negative pressure needle for single-handedly aspirating joint effusion in one embodiment of this application.

[0017] Figure 2 The diagram shows a schematic of a stop valve in one embodiment of this application, where the stop block control element is a spiral stop rod.

[0018] Figure 3 The diagram shows a stop valve in one embodiment of this application, where the stop block control element is a ball valve.

[0019] Figure 4 The diagram shows a schematic of a stop valve in one embodiment of this application, where the stop block control element is a lever.

[0020] Figure 5 The diagram shows a schematic of a shut-off valve in one embodiment of this application, where the shut-off block control element is a deformable key.

[0021] Figure 6 The diagram shows a schematic of the structure of the clip on the syringe plunger in one embodiment of this application, which is bent during use. Detailed Implementation

[0022] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, unless otherwise specified, the following embodiments and features in the embodiments can be combined with each other.

[0023] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. Although the drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components, the form, quantity and proportion of each component can be arbitrarily changed in actual implementation, and the layout of the components may also be more complex.

[0024] To address the shortcomings of existing technologies and equipment, this application provides a negative pressure needle that can be used to extract joint effusion with one hand, helping clinicians to fully and accurately extract intracavitary fluids such as joint fluid, thereby improving clinical efficiency and reducing the risk of clinical errors.

[0025] like Figure 1 The diagram shows a schematic of a negative pressure needle tube for single-handed aspiration of joint effusion according to an embodiment of this application. As shown, the negative pressure needle tube includes: a syringe needle 1, a syringe barrel 2, and a syringe plunger 3. It should be noted that... Figure 1 The structure of the shut-off valve 4 described herein is only an example of an embodiment in which the shut-off block control element 42 is a helical shut-off rod. However, it should be noted that in this application, the shut-off block control element 42 also includes embodiments with other structures, which are described in detail below.

[0026] A shut-off valve 4 is provided between the syringe needle 1 and the syringe barrel 2; the shut-off valve 4 is controlled to make the syringe needle 1 and the syringe barrel 2 connected or closed.

[0027] The syringe plunger 3 is provided with a negative pressure fixing structure, which is used to fix the syringe plunger 3 after pulling it from the syringe barrel 2 when the shut-off valve 4 is in the closed state, so as to create a negative pressure environment inside the syringe barrel 2.

[0028] In this application, the operating principle of the negative pressure syringe capable of single-handedly aspirating joint effusion is as follows: First, the shut-off valve 4 is closed to maintain a seal between the syringe needle 1 and the syringe barrel 2. Then, the syringe plunger 3 is pulled and fixed by the negative pressure fixing structure to create a negative pressure environment inside the syringe barrel 2. Next, the negative pressure syringe capable of single-handedly aspirating joint effusion is inserted into the patient's skin or blood vessel through the syringe needle 1. At this point, the shut-off valve 4 can be opened with one hand, connecting the syringe needle 1 and the syringe barrel 2. Because the syringe barrel 2 is in a negative pressure environment, it automatically draws in the patient's blood or effusion, thus enabling the doctor to aspirate joint effusion with one hand.

[0029] It should be noted that negative pressure syringes are already in use, meaning that even in a sealed environment like the syringe barrel 2, the syringe plunger 3 can still be pulled to a considerable height, creating a large negative pressure space. In contrast, the plunger of a conventional syringe can only be pulled to a relatively small height. The syringe used in this application is a negative pressure syringe.

[0030] In this application, in order to enable one-handed operation of the negative pressure needle for liquid extraction, a shut-off valve 4 and a negative pressure fixing structure are proposed to improve the doctor's liquid extraction operation.

[0031] In this application, the shut-off valve 4 includes various embodiments, in corresponding... Figure 1 In this embodiment, only the schematic diagram of the shut-off valve structure corresponding to the helical shut-off rod, with the shut-off block control component 42 as an example, is used for illustration. Figure 2 As shown, the shut-off valve 4 includes: a conical shut-off block 41, a shut-off block control component 42, an upper connecting sleeve 43 connected to the syringe barrel 2, and a lower connecting sleeve 44 connected to the syringe needle 1. The thread 47 connects the upper connecting sleeve 43 and the lower connecting sleeve 44 to ensure a tight fit between them.

[0032] The conical stop block 41 is fitted with a rubber sealing block 45. A gap 46 is provided between the non-conical surface (lower cylindrical part) of the conical stop block 41 and the rubber sealing block 45. This gap 46 allows communication between the upper connecting sleeve 43 and the lower connecting sleeve 44 when the conical surface of the conical stop block 41 is disengaged from the upper connecting sleeve 43 by the stop block control member 42. This also allows communication between the syringe needle 1 and the syringe barrel 2. See details for further information. Figure 2 The dashed line in the middle represents the schematic flow path.

[0033] The stop block control component 42 is used to manually control the conical stop block 41 to move axially along the stop valve 4, so that the conical surface of the conical stop block 41 disengages from or engages with the upper connecting sleeve 43, thereby realizing the connection or closure between the syringe needle 1 and the syringe barrel 2.

[0034] In this embodiment, the conical surface of the conical stop block 41 faces the syringe barrel 2. The purpose is that when the syringe plunger 3 in the syringe barrel 2 is pulled, the conical surface of the conical stop block 41 is drawn upwards, thus tightly pressing against the upper connecting sleeve 43 to ensure a sealed environment inside the syringe barrel 2.

[0035] Example 1

[0036] In this embodiment, the stop block control component 42 is a helical stop rod, specifically as follows: Figure 2 As shown.

[0037] The spiral stop rod passes through the conical stop block 41 and the rubber sealing block 45.

[0038] The side wall of the shut-off valve 4 is provided with a slit groove for the rotation of the spiral shut-off rod; the slit groove has a certain inclination angle with the vertical plane perpendicular to the axial direction of the shut-off valve 4; the circumference of the slit groove is less than the circumference of the shut-off valve 4 but greater than half the circumference of the shut-off valve 4, that is, the slit groove is not completely cut to allow the spiral shut-off rod to rotate. Normally, the range is between 270 degrees and 360 degrees; in the embodiment, the doctor can open or close the valve by controlling the spiral shut-off rod to rotate 90 degrees with two fingers; the two ends of the spiral shut-off rod that protrude from the shut-off valve 4 are provided with force-bearing platforms (operating surfaces for the doctor's fingers) to increase the force-bearing area and facilitate operation.

[0039] By rotating the spiral stop rod with two fingers of one hand, the conical stop block 41 and the rubber sealing block 45 are moved axially along the stop valve 4, so that the conical surface of the conical stop block 41 disengages from or engages with the upper connecting sleeve 43, thereby achieving communication or closure between the syringe needle 1 and the syringe barrel 2.

[0040] It should be noted that, since the length of the spiral stop rod is much greater than the hole through the conical stop block 41 and the rubber sealing block 45, the spiral stop rod can have a good sealed environment. That is, during use, there will be no air or liquid leakage, or only a very small amount of air or liquid leakage.

[0041] Example 2

[0042] In this embodiment, the stop block control component 42 is a ball valve, such as... Figure 3 As shown.

[0043] The ball valve is positioned between the conical stop block 41 and the upper connecting sleeve 43. By pressing or releasing the outer wall of the stop valve 4, the ball valve moves toward the center or edge of the stop valve 4, thereby causing the conical surface of the conical stop block 41 to disengage from or engage with the upper connecting sleeve 43, so as to achieve communication or closure between the syringe needle 1 and the syringe barrel 2.

[0044] Example 3

[0045] In this embodiment, the stop block control element 42 is a lever, such as... Figure 4 As shown.

[0046] The lever passes through the side wall of the shut-off valve 4 and is placed between the conical shut-off block 41 and the upper connecting sleeve 43. Using the side wall of the shut-off valve 4 as a fulcrum, the conical shut-off block 41 is disengaged from or engaged with the upper connecting sleeve 43 by pressing or releasing the lever, so as to achieve communication or closure between the syringe needle 1 and the syringe barrel 2.

[0047] Example 4

[0048] In this embodiment, the stop block control element 42 is a deformable key, such as... Figure 5 As shown.

[0049] When not pressed, the deformable key is in the shape of a straight line and is placed between the conical stop block 41 and the upper connecting sleeve 43; when the deformable key is pressed, the end of the deformable key abuts against the conical stop block 41 and is deformed into a rhombus shape, thereby causing the conical stop block 41 to disengage from the upper connecting sleeve 43.

[0050] In one embodiment of this application, the negative pressure fixing structure provided on the syringe plunger 3 is a detachable clip 31; the clip 31 is integrally injection molded and embedded in a matching clip hole through a point connection; after pulling the syringe plunger 3 from the syringe barrel 2, the clip 31 is bent and placed perpendicular to the clip hole to restrict the syringe plunger 3 from moving towards the syringe barrel 2 due to negative pressure. Figure 6 The diagram shown illustrates the use of the bending clip 31.

[0051] In this embodiment, the negative pressure fixing structure provided on the syringe plunger 3 further includes a slot 32 on the syringe plunger 3; the slot 32 is used to fix the syringe plunger 3 after it is pulled by a retainer. For example, the use of the slot 32 requires an additional retainer, which can be a baffle or a retaining ring, etc.

[0052] In this embodiment, the syringe barrel 2 is provided with a scale to observe the liquid volume inside.

[0053] The negative pressure needle for single-handed aspiration of joint effusion described in this application has a simple structure, is easy to manufacture and operate, and is convenient for users to aspirate joint effusion. It can help clinicians to fully and accurately aspirate intracavitary fluids such as joint fluid, improve clinical efficiency and reduce the risk of clinical errors.

[0054] In summary, this application effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0055] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this application should still be covered by the claims of this application.

Claims

1. A negative pressure syringe for single-handed aspiration of joint effusion, characterized in that, The negative pressure needle tube includes: a syringe needle, a syringe barrel, and a syringe plunger; A shut-off valve is provided between the syringe needle and the syringe barrel; the shut-off valve is controlled to make or break the connection between the syringe needle and the syringe barrel; the shut-off valve includes: a conical shut-off block, a shut-off block control component, an upper connecting sleeve connected to the syringe barrel, and a lower connecting sleeve connected to the syringe needle; the conical surface of the conical shut-off block faces the direction of the syringe barrel. The syringe plunger is provided with a negative pressure fixing structure, which is used to fix the syringe plunger after pulling it from the syringe barrel when the shut-off valve is in the closed state, so as to create a negative pressure environment inside the syringe barrel. The negative pressure fixing structure on the syringe plunger is a detachable clip; the clip is integrally injection molded into a matching clip hole through point connection; after pulling the syringe plunger from the syringe barrel, the clip is bent and placed perpendicular to the clip hole to restrict the syringe plunger from moving towards the syringe barrel due to negative pressure.

2. The negative pressure needle for single-handed aspiration of joint effusion according to claim 1, characterized in that, The tapered stop block is adapted to be fitted with a rubber sealing block; The stop block control component is used to manually control the conical stop block to move axially along the stop valve, so that the conical surface of the conical stop block disengages from or engages with the upper connecting sleeve, thereby achieving communication or closure between the syringe needle and the syringe barrel.

3. The negative pressure needle for single-handed aspiration of joint effusion according to claim 2, characterized in that, The stop block control component is a spiral stop rod; The spiral stop rod passes through the conical stop block and the rubber sealing block; The side wall of the shut-off valve is provided with a slit groove for the spiral shut-off rod to rotate; the slit groove has a certain inclination angle with the vertical plane of the axial direction of the shut-off valve; the circumference of the slit groove is smaller than the circumference of the shut-off valve, but larger than half the circumference of the shut-off valve. The spiral stop rod extends through both ends of the stop valve and is provided with force-bearing platforms to increase the force-bearing area and facilitate operation; By rotating the spiral stop rod with two fingers of one hand, the conical stop block and the rubber sealing block move along the axial direction of the stop valve, so that the conical surface of the conical stop block disengages from or engages with the upper connecting sleeve, thereby achieving communication or closure between the syringe needle and the syringe barrel.

4. The negative pressure needle for single-handed aspiration of joint effusion according to claim 2, characterized in that, The shut-off block control component is a ball valve; The ball valve is positioned between the conical stop block and the upper connecting sleeve. By pressing or releasing the outer wall of the stop valve, the ball valve moves toward the center or edge of the stop valve, thereby causing the conical surface of the conical stop block to disengage from or engage with the upper connecting sleeve, thus achieving communication or closure between the syringe needle and the syringe barrel.

5. The negative pressure needle for single-handed aspiration of joint effusion according to claim 2, characterized in that, The stop block control component is a lever; The lever passes through the side wall of the shut-off valve and is placed between the conical shut-off block and the upper connecting sleeve. Using the side wall of the shut-off valve as a fulcrum, the conical shut-off block is disengaged from or engaged with the upper connecting sleeve by pressing or releasing the lever, thereby achieving communication or closure between the syringe needle and the syringe barrel.

6. The negative pressure needle for single-handed aspiration of joint effusion according to claim 2, characterized in that, The stop block control component is a deformable key; When not pressed, the deformable key is in the shape of a straight line and is placed between the conical stop block and the upper connecting sleeve; when the deformable key is pressed, the end of the deformable key abuts against the conical stop block and is deformed into a rhombus shape, thereby causing the conical stop block to disengage from the upper connecting sleeve.

7. The negative pressure needle for single-handed aspiration of joint effusion according to claim 1, characterized in that, The negative pressure fixing structure provided on the syringe plunger also includes: a slot provided on the syringe plunger; the slot is used to fix the syringe plunger after it is pulled by a retainer.

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