A pressure-controllable negative pressure generator

Abstract

The present invention relates to the technical field of medical devices, and specifically to a pressure-controllable negative pressure generator, comprising: an interface piece is arranged at one end of a syringe, a through cavity is opened inside the interface piece, the through cavity is communicated with the syringe, and a valve is arranged at the interface piece; a piston rod is arranged at the other end of the syringe, and the piston rod can reciprocate in the syringe; an opening-related device is connected to the piston rod and the valve respectively, and the opening-related device can change the opening of the valve through the movement of the piston rod; the beneficial effect is: avoiding instantaneous large negative pressure at the front end of the syringe due to the movement of the piston rod, making blood extraction during surgery safer and more controllable, and reducing adverse reactions such as vascular spasm.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to a pressure-controllable negative pressure generator. Background Art

[0002] In clinical practice, there is a type of surgery or operation that often requires the extraction of blood or substances such as blood clots in the blood. At this time, the limit syringe becomes an indispensable tool. However, although the limit syringe is widely used in the medical field as a standard product, it also has some obvious disadvantages.

[0003] Specifically, when medical staff starts to pull the piston rod of the limit syringe, the front opening of the syringe will quickly generate a large negative pressure. This sudden change in negative pressure will often cause the amount of blood drawn to exceed expectations, which may in turn cause adverse reactions such as vasospasm. This phenomenon not only increases the risk of surgery, but may also have adverse effects on the patient's health.

[0004] To this end, the present invention proposes a pressure-controllable negative pressure generator to solve the above-mentioned problems. Summary of the invention

[0005] The object of the present invention is to provide a pressure-controllable negative pressure generator to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a pressure-controllable negative pressure generator, the pressure-controllable negative pressure generator comprising: a syringe, an interface, a piston rod and an opening-related device;

[0007] An interface piece is arranged at one end of the syringe, a through cavity is opened inside the interface piece, the through cavity is communicated with the syringe, and a valve is arranged at the interface piece;

[0008] A piston rod is provided at the other end of the syringe, and the piston rod can reciprocate in the syringe;

[0009] The opening degree association device is connected to the piston rod and the valve respectively, and the opening degree association device can change the opening degree of the valve through the movement of the piston rod.

[0010] Preferably, the opening-related device comprises a bottom outer frame, a rotating shaft, a telescopic plate, a telescopic rod and a connecting plate;

[0011] The bottom outer frame is fixed to the outside of the interface member, a through hole is opened on the surface of the bottom outer frame, a rotating shaft is rotatably connected in the through hole, and an outer ring member is fixed on the surface of the bottom outer frame;

[0012] An outer wheel is arranged at one end of the rotating shaft, a second spur tooth is arranged on the surface of the outer wheel, and the other end of the rotating shaft is connected to the valve;

[0013] The surface of the telescopic plate is provided with a first straight tooth, the second straight tooth is meshed and connected with the first straight tooth, one end of the telescopic plate is connected with a telescopic rod, the telescopic rod is fixedly connected to the connecting plate, and the connecting plate is connected to the piston rod.

[0014] Preferably, one or more sets of side ears are fixed on the outer wall of the injection barrel, through holes are opened on the surfaces of the side ears, and the outer wall of the telescopic rod and the inner wall of the through hole are slidably connected.

[0015] Preferably, the angular range of rotation of the rotating shaft is adjusted by the ratio of the second spur teeth on the outer wheel surface to the circumference of the outer wheel surface and the length of the first spur teeth;

[0016] The rotating shaft is rotatably connected to the interface member.

[0017] Preferably, the second spur teeth occupy one quarter of the circumference of the outer wheel surface.

[0018] Preferably, a guide rod is fixed to the side of the outer wheel, the end of the guide rod is made of ferromagnetic metal, the end of the guide rod is chamfered, the outer ring is located outside the perforation, an inner groove is provided on the surface of the outer ring, the guide rod is embedded in the inner groove and slidably connected, and a baffle is fixed at the end of the inner groove, which is magnetic and can attract the guide rod.

[0019] Preferably, the inner groove is a quarter arc.

[0020] Preferably, an inner ring groove is formed between the outer ring member and the through hole, a sealing gasket is fixed on the rotating shaft, the sealing gasket is arranged close to the outer wheel, and the sealing gasket is located in the inner ring groove.

[0021] Preferably, a handle is provided at the end of the piston rod, and a connecting plate is provided at the front end of the handle.

[0022] Preferably, the valve comprises a flow limiting member arranged inside the through cavity, the flow limiting member is spherical and is hollowed out, and the flow limiting member is fixedly connected to the rotating shaft.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention proposes a pressure-controllable negative pressure generator, which avoids the instantaneous large negative pressure at the front end of the syringe due to the movement of the piston rod, making blood extraction during surgery safer and more controllable, and reducing adverse reactions such as vascular spasm. This avoids the problem that when medical staff starts to pull the piston rod of the limit syringe, the front end opening of the syringe will quickly generate a large negative pressure. This sudden change in negative pressure often causes the amount of blood drawn to exceed expectations, which may further induce adverse reactions such as vascular spasm. This phenomenon not only increases the risk of surgery, but may also have an adverse effect on the patient's health. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of the present invention;

[0026] Figure 2 It is a side view of the structure of the present invention;

[0027] Figure 3 This is a schematic diagram of the piston rod structure of the present invention;

[0028] Figure 4 This is a schematic diagram of the rotating shaft structure of the present invention;

[0029] Figure 5 This is a schematic diagram of the structure of the pleurotus eryngii of the present invention;

[0030] Figure 6 for Figure 5 A magnified view of the structure at center;

[0031] Figure 7 This is a schematic diagram of the bottom outer frame structure of the present invention;

[0032] Figure 8 It is a schematic diagram of the structure of the interface component of the present invention;

[0033] Fig. 9 It is a cross-sectional view of the overall structure of the injection barrel, bottom outer frame and interface member of the present invention.

[0034] In the figure: 1. bottom outer frame; 2. outer wheel; 3. first straight tooth; 4. telescopic plate; 5. telescopic rod; 6. side ear; 7. connecting plate; 8. pull handle; 9. piston rod; 10. syringe barrel; 11. outer ring; 12. flow limiting member; 13. rotating shaft; 15. sealing gasket; 16. second straight tooth; 17. guide rod; 18. through hole; 19. inner ring groove; 20. perforation; 21. baffle; 22. inner groove; 23. interface member; 24. through cavity; 25. valve. DETAILED DESCRIPTION

[0035] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Embodiment 1: A pressure-controllable negative pressure generator comprises: a syringe 10, an interface member 23, a piston rod 9 and an opening-related device; an interface member 23 is provided at one end of the syringe 10, a through cavity 24 is provided inside the interface member 23, the through cavity 24 is communicated with the syringe 10, and a valve 25 is provided at the interface member 23; a piston rod 9 is provided at the other end of the syringe 10, and the piston rod 9 can reciprocate in the syringe 10; the opening-related device is respectively connected to the piston rod 9 and the valve 25, and the opening-related device can change the opening of the valve 25 through the movement of the piston rod 9;

[0037] When in use, the opening association device is a mechanical mechanism or an electronic control device, which can monitor or feedback the movement of the piston rod 9, and convert the movement of the piston rod 9 into the opening movement of the valve 25 according to a certain ratio, thereby realizing the adjustment of the opening of the front end interface part 23 of the syringe 10 by the movement of the piston rod 9. At the beginning of the movement of the piston rod 9, the valve 25 at the interface part 23 is only opened a little, and the opening is small, thereby avoiding the generation of a large instantaneous negative pressure at the front end of the interface part 23 caused by the start of the movement of the piston rod 9.

[0038] Embodiment 2: Based on Embodiment 1, the opening correlation device adopts a mechanical structure, please refer to Figure 1-Figure 9 The opening-related device comprises a bottom outer frame 1, a rotating shaft 13, a telescopic plate 4, a telescopic rod 5 and a connecting plate 7. The bottom outer frame 1 is fixed to the outside of the interface member 23. A through hole 20 is provided on the surface of the bottom outer frame 1. The rotating shaft 13 is rotatably connected in the through hole 20. An outer ring member 11 is fixed on the surface of the bottom outer frame 1. An outer wheel 2 is provided at one end of the rotating shaft 13. A second straight tooth 16 is provided on the surface of the outer wheel 2. The other end of the rotating shaft 13 is connected to a valve 25. A first straight tooth 3 is provided on the surface of the telescopic plate 4. The second straight tooth 16 is meshed and connected with the first straight tooth 3. A telescopic rod 5 is connected to one end of the telescopic plate 4. The telescopic rod 5 is fixedly connected to the connecting plate 7. The connecting plate 7 is connected to the piston rod 9.

[0039] When using, combine Figure 1 , 2As shown in Figure 9, the syringe 10 is in the initial state at this time. At this time, manually pulling the handle 8 will drive the connecting plate 7, the piston rod 9 and the telescopic rod 5 to move, thereby performing the extraction operation. At the same time, the telescopic plate 4 will move synchronously, so that under the meshing action of the first straight tooth 3 and the second straight tooth 16, the outer wheel 2 will rotate, thereby driving the rotating shaft 13 to rotate, and then causing the valve 25 to rotate, so that the opening of the valve 25 gradually increases, thereby achieving negative pressure while slowing down the speed of negative pressure generation, and avoiding the instantaneous generation of excessive negative pressure; when the limiting flow of the valve The member 12 is spherical and has a hole. When the flow limiting member 12 is fixedly connected to the rotating shaft, the rotating shaft 13 rotates so that the hole of the flow limiting member 12 gradually faces the piston rod 9, thereby making the axial direction of the hole of the flow limiting member 12 change from perpendicular to the axial direction of the piston rod 9 or the injection barrel 10 or the through cavity 24 to parallel. When the flow limiting member 12 rotates, since the flow limiting member 12 is spherical and has a hole, the flow rate of the fluid can be slowly expanded when the piston rod 9 is pulled, thereby slowing down the speed of generating negative pressure while achieving negative pressure, and avoiding the instantaneous generation of excessive negative pressure.

[0040] When in use: the second spur teeth 16 on the surface of the outer wheel 2 and the first spur teeth 3 on the surface of the telescopic plate 4 form a gear rack mechanism, and the angle range of rotation of the rotating shaft 13 is adjusted by adjusting the length of the first spur teeth 3 or the proportion of the second spur teeth 16 to the circumference of the surface of the outer wheel 2. When the valve 25 or the flow limiter 12 rotates 90 degrees to achieve the maximum opening from closed, the meshing length of the first spur teeth 3 and the second spur teeth 16 is one quarter of the circumference of the surface of the outer wheel 2. The following methods can be adopted:

[0041]

[0042] Furthermore, the front end gear teeth of the first spur gear 3 meshing with the second spur gear 16 are small and dense, while the rear end gear teeth are large and sparse, thereby realizing the beginning of the movement of the piston rod 9, that is, when the piston rod 9 moves to a position close to the front end of the syringe 10 (the end connected to the interface member 23), the valve 25 of the interface member 23 opens small and slow, and when the piston rod 9 moves to the end close to the syringe 10, the valve 25 of the interface member 23 opens large and fast, so that when the negative pressure is just generated, the valve 25 of the interface member 23 opens small, avoiding the instantaneous large negative pressure at the front end of the syringe 10 when the piston rod 9 just starts to move, making blood suction during surgery safer and controllable, and reducing adverse reactions such as vasospasm.

[0043] In one case, when the piston rod 9 moves to the end of the syringe 10, under the action of the first spur gear 3 and the second spur gear 16, the rotating shaft 13 drives the valve 25 or the flow-limiting member 12 to rotate just 90 degrees, and the opening of the valve 25 reaches the maximum. In another case, when the piston rod 9 moves to the middle of the syringe 10, the opening of the valve 25 reaches the maximum. When the piston rod 9 continues to move toward the end of the syringe 10, since the meshing length of the first spur gear 3 and the second spur gear 16 is one-fourth of the circumference of the outer wheel 2, the outer wheel 2 no longer meshes with the telescopic plate 4 after rotating 90 degrees, and the outer wheel 2 moves away from the telescopic plate 4. The movement of the telescopic plate 4 will no longer affect the rotation of the outer wheel 2, so that when the piston rod 9 continues to move toward the end of the syringe 10, the opening of the valve 25 remains at the maximum state.

[0044] Embodiment 3: Based on the embodiment 2, two sets of side ears 6 are fixed on the outer wall of the syringe 10, and the surface of the side ears 6 is provided with a through hole 18, the outer wall of the telescopic rod 5 and the inner wall of the through hole 18 are slidably connected, and a pull handle 8 is provided at the end of the piston rod 9, and a connecting plate 7 is provided at the front end of the pull handle 8;

[0045] When in use, by pulling the handle 8 and moving the connecting plate 7 away from the injection cylinder 10, the piston rod 9 and the telescopic rod 5 can be driven to move, so that the piston rod 9 and the telescopic rod 5 move synchronously. When the telescopic rod 5 moves, the telescopic rod 5 will continue to slide in the through hole 18. The two groups of side ears 6 provided can provide guidance and support for the movement of the telescopic rod 5, provide a stable support point, and improve the stability of the telescopic rod 5.

[0046] Embodiment 4: On the basis of embodiment 2 or embodiment 3, the second spur tooth 16 occupies one quarter of the circumference of the surface of the outer wheel 2, a guide rod 17 is fixed to the side of the outer wheel 2, the end of the guide rod 17 is made of ferromagnetic metal, the end of the guide rod 17 is chamfered, the outer ring 11 is located outside the perforation 20, an inner groove 22 is provided on the surface of the outer ring 11, the guide rod 17 is embedded in the inner groove 22 and is slidably connected, a baffle 21 is fixed at the end of the inner groove 22, the baffle 21 is magnetic and can attract the guide rod 17, and the inner groove 22 is a quarter of a circle.

[0047] When in use, since the second spur teeth 16 occupy a quarter of the circumference of the surface of the outer wheel 2 and the inner groove 22 is a quarter of a circular arc, when the first spur teeth 3 on the telescopic plate 4 and the second spur teeth 16 of the outer wheel 2 are engaged, the telescopic plate 4 will be removed from the outer wheel 2, and at the same time, the hole of the flow limiting member 12 will be completely facing the piston rod 9. At this time, it is the maximum flow state. At this time, the outer wheel 2 will rotate 90°. In order to ensure the stability of the flow limiting member 12, there is the following process: when the outer wheel 2 rotates, the guide rod 17 set will be synchronously in the inner groove 22 The guide rod 17 will slide and continuously move along the inner groove 22. When in the maximum flow state, the guide rod 17 will move straight to the baffle 21 and contact the baffle 21. Since the baffle 21 is magnetic, the guide rod 17 can be adsorbed, thereby ensuring the stability of the outer wheel 2, and then ensuring the stability of the rotating shaft 13, and then ensuring the stability of the flow limiting member 12, and will not be affected by the fluid in the injection barrel 10 or the interference of other mechanisms such as the telescopic plate 4 to affect the opening of the valve 25 (or the position change of the flow limiting member 12).

[0048] An inner ring groove 19 is formed between the outer ring member 11 and the through hole 20. A sealing gasket 15 is fixed on the rotating shaft 13. The sealing gasket 15 is arranged close to the outer wheel 2 and is located in the inner ring groove 19.

[0049] When in use, the sealing pad 15 is located in the inner annular groove 19 to prevent blood leakage and maintain the stability of the negative pressure environment.

[0050] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pressure-controllable negative pressure generator, characterized in that: The pressure-controllable negative pressure generator comprises: a syringe (10), an interface component (23), a piston rod (9) and an opening-related device; An interface member (23) is provided at one end of the injection barrel (10), a through cavity (24) is provided inside the interface member (23), the through cavity (24) is communicated with the injection barrel (10), and a valve (25) is provided at the interface member (23); A piston rod (9) is disposed at the other end of the injection barrel (10), and the piston rod (9) is capable of reciprocating in the injection barrel (10); The opening degree association device is respectively connected to the piston rod (9) and the valve (25), and the opening degree association device can change the opening degree of the valve (25) through the movement of the piston rod (9); the opening degree association device comprises a bottom outer frame (1), a rotating shaft (13), a telescopic plate (4), a telescopic rod (5) and a connecting plate (7); The bottom outer frame (1) is fixed to the outside of the interface member (23); a through hole (20) is provided on the surface of the bottom outer frame (1); a rotating shaft (13) is rotatably connected in the through hole (20); and an outer ring member (11) is fixed on the surface of the bottom outer frame (1); An outer wheel (2) is disposed at one end of the rotating shaft (13), a second spur tooth (16) is provided on the surface of the outer wheel (2), and the other end of the rotating shaft (13) is connected to a valve (25); A first straight tooth (3) is provided on the surface of the telescopic plate (4), and the second straight tooth (16) is meshed and connected with the first straight tooth (3). One end of the telescopic plate (4) is connected to a telescopic rod (5), and the telescopic rod (5) is fixedly connected to the connecting plate (7), and the connecting plate (7) is connected to the piston rod (9).

2. A pressure-controllable negative pressure generator according to claim 1, characterized in that: One or more sets of side ears (6) are fixed on the outer wall of the injection barrel (10), a through hole (18) is opened on the surface of the side ears (6), and the outer wall of the telescopic rod (5) and the inner wall of the through hole (18) are slidably connected.

3. The pressure-controllable negative pressure generator according to claim 1, characterized in that: The angular range of rotation of the rotating shaft (13) is adjusted by the ratio of the second spur teeth (16) on the surface of the outer wheel (2) to the circumference of the surface of the outer wheel (2) and the length of the first spur teeth (3); The rotating shaft (13) is rotatably connected to the interface member (23).

4. The pressure-controllable negative pressure generator according to claim 1, characterized in that: The second spur teeth (16) occupy one quarter of the circumference of the surface of the outer wheel (2).

5. The pressure-controllable negative pressure generator according to claim 1, characterized in that: A guide rod (17) is fixed on the side of the outer wheel (2), the end of the guide rod (17) is made of ferromagnetic metal, the end of the guide rod (17) is chamfered, the outer ring (11) is located outside the perforation (20), the surface of the outer ring (11) is provided with an inner groove (22), the guide rod (17) is embedded in the inner groove (22) and is slidably connected, and a baffle (21) is fixed at the end of the inner groove (22), and the baffle (21) is magnetic and can attract the guide rod (17).

6. A pressure-controllable negative pressure generator according to claim 5, characterized in that: The inner groove (22) is a quarter arc.

7. The pressure-controllable negative pressure generator according to claim 1, characterized in that: An inner ring groove (19) is formed between the outer ring member (11) and the through hole (20), a sealing gasket (15) is fixed on the rotating shaft (13), the sealing gasket (15) is arranged close to the outer wheel (2), and the sealing gasket (15) is located in the inner ring groove (19).

8. The pressure-controllable negative pressure generator according to claim 1, characterized in that: A pull handle (8) is provided at the end of the piston rod (9), and a connecting plate (7) is provided at the front end of the pull handle (8).

9. A pressure-controllable negative pressure generator according to any one of claims 1 to 8, characterized in that: The valve (25) comprises a flow limiting member (12) arranged inside the through cavity (24); the flow limiting member (12) is spherical and has a hole cut out; the flow limiting member (12) is fixedly connected to the rotating shaft (13).

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