Closed positive pressure joint

Abstract

The invention discloses a closed positive pressure connector, and relates to the technical field of medical machinery. Comprising a shell, an input port and an output port are formed in the upper end and the lower end of the shell respectively, a piston is arranged in the shell, the periphery of the top of the piston is attached to the inner wall of the shell in a sealed mode to form a positive pressure cavity, a push plate is connected to the bottom of the piston through a bearing, and a first elastic piece is installed between the bottom of the push plate and a bottom solid area of the shell; a pushing mechanism is mounted on one side in the piston and comprises a first mounting groove, a push rod is connected into the first mounting groove through a second elastic piece, a sealing push plate is fixedly connected to the top of the push rod and sleeves the periphery of the connecting column, and a connecting groove is formed in the bottom of the push rod; and a pull-back assembly is mounted in the connecting groove, so that constant pressure is always kept in the positive pressure cavity, and blood backflow and thrombus formation are effectively avoided.

Description

Technical Field

[0001] The invention relates to the technical field of medical machinery, in particular to a closed positive pressure joint. Background Art

[0002] Indwelling needles, central venous catheters, peripherally inserted central venous catheters, infusion ports and other medical devices that need to be left in the human blood circulation system for a long time can be used for multiple medications, avoiding repeated punctures, reducing patient pain and body damage. However, after each infusion, if the needle or cone head is directly removed from the indwelling device, a cavity will be formed, resulting in negative pressure, causing blood to flow back into the indwelling device, forming a thrombus blockage, and causing the indwelling device to be scrapped. Therefore, a positive pressure connector is needed to prevent blockage caused by blood backflow when the needle or cone head is removed;

[0003] However, when the needle or cone head is removed from the existing positive pressure connector, liquid medicine still remains in the positive pressure chamber, and needs to flow into the patient's body through the micro-osmotic fiber column to prevent the formation of blood clots. However, as the micro-osmosis time of the liquid medicine through the micro-osmotic fiber column goes by, the liquid medicine gradually decreases, and the pressure in the positive pressure chamber decreases, resulting in a slowdown in the micro-osmosis rate, which makes it easy for blood to flow back and form blood clots.

[0004] In view of the above problems, it is urgent to carry out innovative design based on the original positive pressure joint. Summary of the invention

[0005] The purpose of the present invention is to provide a closed positive pressure connector to solve the problem raised in the above background technology that as time goes by, the liquid medicine gradually decreases, the pressure in the positive pressure chamber decreases, resulting in a slowdown in the microosmosis rate, making it easy for blood to flow back. The technical solution of the present invention is aimed at the technical problem that the existing technical solutions are too single, and provides a solution that is significantly different from the existing technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a closed positive pressure joint, comprising a shell, wherein the upper and lower ends of the shell are respectively provided with an input port and an output port, a piston is provided inside the shell, the outer periphery of the top of the piston is sealed and fitted with the inner wall of the shell to form a positive pressure chamber, a connecting column is fixedly installed on the top of the piston, a push plate is connected to the bearing at the bottom of the piston, a first elastic member is installed between the bottom of the push plate and the bottom solid area of ​​the shell, an infusion channel is fixedly connected inside the shell, the infusion channel passes through the piston to the positive pressure chamber, and a pushing mechanism is installed on one side of the inside of the piston;

[0007] The pushing mechanism includes a first mounting groove, which is opened on one side of the piston. A push rod is connected to the first mounting groove through a second elastic member. A sealing push plate is fixedly connected to the top of the push rod. The sealing push plate is sleeved on the periphery of the connecting column. A connecting groove is opened at the bottom of the push rod, and a pullback assembly is installed in the connecting groove.

[0008] Preferably, the pullback assembly includes a pull rod, which is rotatably installed in the connecting groove through a torsion spring, and the pull rod extends from the bottom of the piston to the second mounting groove, and the second mounting groove is opened at the top of the push plate. The second mounting groove is opened in an annular shape and corresponds to the first mounting groove. A guide groove A is provided on the inner wall of one side of the second mounting groove, and the guide groove A is designed as a spiral structure. A guide rod A is provided at the lower end of the pull rod, and the guide rod A slides in the guide groove A within a limited position.

[0009] Preferably, a guide groove B and a resistance groove of a spiral structure are provided on the inner wall of the middle section of the shell, and a guide rod B is provided on one side of the outer periphery of the piston. The guide rod B slides in the guide groove B in a limited position, and a resistance rod is installed in the bottom cavity of the piston through damping lateral limited sliding. The outer end of the resistance rod slides in the resistance groove, and the movement trajectory of the resistance rod is the same as that of the guide rod B. The outer end of the resistance rod is provided with an inclined surface structure with an inclined surface facing upward, and a protrusion A is provided on the side of the inclined surface on the resistance rod.

[0010] Preferably, the resistance blocks are connected in the resistance grooves at the upper and lower ends by torsion springs for limiting rotation, the resistance block at the upper end is an "L"-shaped structure, the resistance surface between the upper resistance block and the protrusion A is an inclined surface structure inclined upward, the resistance block at the lower end is a rectangular structure, the resistance surface between the lower resistance block and the resistance rod is a right-angle structure, the resistance block at the lower end rotates downward in one direction, and the resistance block at the upper end rotates upward in one direction.

[0011] Preferably, a bump B is provided on one side of the middle section of the pull rod corresponding to the inner end of the abutment rod, and bumps are alternately provided on the side surface of the top of the pull rod and the inner wall of the connecting groove.

[0012] Preferably, a micro-osmotic fiber column is installed on the top of the infusion channel, the bottom of the micro-osmotic fiber column is connected to the infusion channel, and a liquid inlet is opened on one side of the infusion channel below the micro-osmotic fiber column.

[0013] Preferably, a sealing block is fixedly connected to the top of the piston, the top of the sealing block is an inclined structure, and guide grooves are provided on both sides of the connecting column and the inner wall of the input port.

[0014] Preferably, a sealing gasket is installed inside the piston in contact with the periphery of the infusion channel, and the sealing gasket is used to seal the liquid inlet when the piston moves upward.

[0015] Preferably, a sealing cover is threadedly connected to the periphery of the input port.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention is provided with a first mounting groove, a first elastic member, a second elastic member, a push rod, a sealing push plate, a connecting groove, a pull rod, a second mounting groove, a guide groove A and a guide rod A. When the medical staff unplugs the infusion tube, the first elastic member rebounds to cooperate with the guide groove B and the guide rod B to drive the internal piston to rotate and move upward, squeezing the residual liquid medicine in the positive pressure chamber so that it enters the patient's body through the micro-osmotic fiber column. As time goes by, the residual liquid medicine in the positive pressure chamber will decrease. At this time, the second elastic member will push the push rod to drive the sealing push plate to push upward to squeeze the liquid medicine, so that a constant pressure is always maintained in the positive pressure chamber, ensuring that the micro-osmosis rate of the liquid medicine will not slow down due to the reduction of the liquid medicine, and effectively avoiding the backflow of blood and the formation of thrombus.

[0018] 2. The present invention is provided with a first mounting groove, a first elastic member, a second elastic member, a push rod, a sealing push plate, a connecting groove, a pull rod, a second mounting groove, a guide groove A and a guide rod A. When the infusion tube is inserted into the input port, it will interfere with the piston to cooperate with the guide groove B and the guide rod B to rotate and move downward. At this time, the guide rod A at the lower end of the pull rod slides in the guide groove A and moves downward, so that the pull rod pulls the push rod to drive the sealing push plate to move downward, compressing the second elastic member and resetting it, so that it can be used multiple times, effectively improving the practicality of the positive pressure joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the cross-sectional structure of the initial state of the present invention;

[0021] Figure 3 This is a schematic diagram of the cross-sectional structure of the present invention in use;

[0022] Figure 4 This is a schematic diagram of the piston structure of the present invention;

[0023] Figure 5 It is a partial enlarged schematic diagram of structure A of the present invention;

[0024] Figure 6 It is a partial enlarged schematic diagram of structure B of the present invention;

[0025] Figure 7 It is a partial enlarged schematic diagram of the C structure of the present invention;

[0026] Figure 8 This is a schematic diagram of the structure of the interference rod of the present invention;

[0027] Fig. 9 It is a schematic diagram of the pull rod structure of the present invention;

[0028] Fig.10 It is a schematic diagram of the structure of the upper end abutment block of the present invention;

[0029] Fig.11 This is a schematic diagram of the structure of the lower end abutment block of the present invention;

[0030] Fig.12 It is a partially enlarged schematic diagram of the D structure of the present invention.

[0031] In the figure: 1. shell; 2. piston; 3. push plate; 4. infusion channel; 51. first mounting groove; 52. second elastic member; 53. push rod; 54. sealing push plate; 55. connecting groove; 561. pull rod; 562. second mounting groove; 563. guide groove A; 564. guide rod A; 6. guide groove B; 7. interference groove; 8. guide rod B; 9. interference rod; 10. bump A; 11. interference block; 12. bump B; 13. micro-seepage fiber column; 14. sealing block; 15. guide groove; 16. sealing pad; 17. sealing cover; 18. first elastic member; 19. connecting column; 20. bump. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on 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.

[0033] See also Figure 1-Figure 12 The present invention provides a technical solution: a closed positive pressure joint, comprising a shell 1, wherein the upper and lower ends of the shell 1 are respectively provided with an input port and an output port, a sealing cover 17 is threadedly connected to the periphery of the input port for sealing the positive pressure joint to prevent the entry of bacteria, a piston 2 is arranged inside the shell 1, the periphery of the top of the piston 2 is sealed and fitted with the inner wall of the shell 1 to form a positive pressure chamber, a connecting column 19 is fixedly installed on the top of the piston 2, a sealing block 14 is fixedly connected to the top of the piston 2, the top of the sealing block 14 is an inclined structure, and both sides of the connecting column 19 and the inner wall of the input port are provided with The guide groove 15, the bottom bearing of the piston 2 is connected with a push plate 3, and a first elastic member 18 is installed between the bottom of the push plate 3 and the bottom solid area of ​​the shell 1. The shell 1 is fixedly connected with an infusion channel 4, and the infusion channel 4 passes through the piston 2 to the positive pressure chamber. During injection, the liquid medicine will flow into the positive pressure chamber along the guide groove 15 on the inner wall of the input port, and then flow into the infusion channel 4 through the guide grooves 15 on both sides of the connecting column 19. A pushing mechanism is installed on one side of the piston 2, and the pushing mechanism squeezes the residual liquid medicine in the positive pressure chamber to keep the pressure inside it stable;

[0034] As an embodiment of the present invention, the pushing mechanism includes a first mounting groove 51, which is opened on one side of the interior of the piston 2. A push rod 53 is connected to the first mounting groove 51 through a second elastic member 52. A sealing push plate 54 is fixedly connected to the top of the push rod 53. The sealing push plate 54 is sleeved on the outer periphery of the connecting column 19. The outer periphery of the sealing push plate 54 is tightly fitted on the inner wall of the shell 1. A connecting groove 55 is opened at the bottom of the push rod 53. A pull-back assembly is installed in the connecting groove 55. The pull-back assembly can reset the sealing push plate 54.

[0035] As an embodiment of the present invention, the pullback assembly includes a pull rod 561, which is rotatably installed in the connecting groove 55 through a torsion spring. The pull rod 561 extends from the bottom of the piston 2 to the second mounting groove 562. The second mounting groove 562 is opened at the top of the push plate 3. The second mounting groove 562 is opened in an annular shape and corresponds to the first mounting groove 51. A guide groove A563 is provided on the inner wall of one side of the second mounting groove 562. The guide groove A563 is designed as a spiral structure. A guide rod A564 is provided at the lower end of the pull rod 561. The guide rod A564 slides in the guide groove A563. The pull rod 561 rotates with the rotation of the piston 2, so that the guide rod A564 at its lower end slides in the spiral guide groove A563, thereby realizing the up and down movement of the pull rod 561.

[0036] As an embodiment of the present invention, a guide groove B6 and a resistance groove 7 with a spiral structure are provided on the inner wall of the middle section of the shell 1, and a guide rod B8 is provided on one side of the outer periphery of the piston 2. The guide rod B8 slides in the guide groove B6 within a limited position. A resistance rod 9 is installed in the bottom cavity of the piston 2 through damping lateral limited sliding. The outer end of the resistance rod 9 slides in the resistance groove 7. The resistance rod 9 has the same motion trajectory as the guide rod B8. The outer end of the resistance rod 9 is provided with an inclined surface structure with an inclined surface facing upward, and a protrusion A10 is provided on the side of the inclined surface of the resistance rod 9.

[0037] As an embodiment of the present invention, the upper and lower end contact grooves 7 are both limitedly rotatably connected with contact blocks 11 through torsion springs. The upper end contact block 11 is an "L"-shaped structure. The contact surface between the upper end contact block 11 and the protrusion A10 is an inclined surface structure inclined upward. The lower end contact block 11 is a rectangular structure. The contact surface between the lower end contact block 11 and the contact rod 9 is a right-angle structure. The lower end contact block 11 rotates downward in one direction, and the upper end contact block 11 rotates upward in one direction. When the contact rod 9 passes through the upper end contact block 11, the inclined surface of the upper end contact block 11 will contact the protrusion A10 on the outer end side of the contact rod 9. , so that the resistance rod 9 moves toward the outer end, and then the pull rod 561 is reset and rotated under the action of the torsion spring, so that the guide rod A564 can extend into the guide groove A563, and the pull rod 561 moves downward with the rotation of the piston 2. When the resistance rod 9 passes through the resistance block 11 at the lower end, the right-angled side of the resistance block 11 at the upper end will resist the inclined surface of the outer end of the resistance rod 9, so that the resistance rod 9 moves inward and resists the protrusion B12 of the resistance rod 9 corresponding to the middle side of the pull rod 561, so that the pull rod 561 rotates, and then the guide rod A564 at the lower end of the pull rod 561 is disengaged from the guide groove A563.

[0038] As an embodiment of the present invention, protrusions 20 are alternately arranged on the top side of the pull rod 561 and the inner wall of the connecting groove 55. When the guide rod A564 disengages from the guide groove A563, the pull rod 561 can be driven to move upward along with the push rod 53. A micro-osmotic fiber column 13 is installed on the top of the infusion channel 4. The bottom of the micro-osmotic fiber column 13 is connected to the infusion channel 4. The micro-osmotic fiber column 13 allows the residual medicine in the positive pressure chamber to slowly penetrate into the infusion channel 4. The infusion channel 4 is provided with a liquid inlet on one side below the micro-osmotic fiber column 13. A sealing gasket 16 is installed in the piston 2 to fit the outer periphery of the infusion channel 4. The sealing gasket 16 is used to seal the liquid inlet when the piston 2 moves upward. At this time, the medicine can only enter the infusion channel 4 through the micro-osmosis of the micro-osmotic fiber column 13.

[0039] Working principle: When using the closed positive pressure joint, first open the input port of the closed positive pressure joint by rotating the sealing cover 17, and insert the infusion joint into the input port. At this time, the infusion joint will contact the sealing block 14, causing the piston 2 to move downward, and cooperate with the guide rod B8 to slide in the guide groove B6 of the spiral structure, thereby causing the piston 2 to rotate. At the same time, the resistance rod 9 in the cavity at the bottom of the piston 2 slides in the resistance groove 7. When passing through the "L"-shaped resistance block 11 at the upper end of the resistance groove 7, its upward inclined surface will contact the convex block A10 on the outer side of the resistance rod 9, causing the resistance rod 9 to move toward the outer end, thereby allowing the pull rod 561 is reset and rotated under the action of the torsion spring, causing the guide rod A564 at the lower end of the pull rod 561 to extend into the guide groove A563. As the piston 2 rotates, the guide rod A564 slides in the guide groove A563, causing the pull rod 561 to move downward, while pulling the push rod 53 to drive the sealing push plate 54 to move downward, and compressing the second elastic member 52. Due to the downward movement of the piston 2, the liquid inlet originally sealed by the sealing gasket 16 is opened, and the drug liquid enters the positive pressure chamber along the guide grooves 15 on the inner wall of the lower end of the input port and on both sides of the connecting column 19, and flows into the infusion channel 4 along the liquid inlet and enters the patient's body;

[0040] When the patient's infusion is completed, the medical staff will pull out the infusion connector from the input port. At this time, the first elastic member 18 in the shell 1 will resist the push plate 3 to drive the piston 2 to move upward, and cooperate with the guide rod B8 to slide in the guide groove B6 of the spiral structure, thereby causing the piston 2 to rotate. The sealing block 14 will move upward in accordance with the movement of the piston 2 to block the liquid inlet in accordance with the infusion channel 4. At this time, the residual liquid in the positive pressure chamber can only be micro-infiltrated into the infusion channel 4 through the micro-infiltration fiber column 13. At the same time, the resistance rod 9 will slide in the resistance groove 7 as the piston 2 rotates. When passing through the resistance block 11 of the rectangular structure at the lower end of the resistance groove 7, the right angle of the resistance block 11 The edge will interfere with the inclined surface of the outer end of the interference rod 9, so that the interference rod 9 will interfere inward with the protrusion B12 on the side of the pull rod 561 to rotate the pull rod 561, and then the guide rod A564 at the lower end of the pull rod 561 will be disengaged from the guide groove A563. At this time, the second elastic member 52 will push the push rod 53 to make the sealing push plate 54 gradually move upward as the medicine liquid decreases, and continuously squeeze the residual medicine liquid in the positive pressure chamber to keep the pressure in the positive pressure chamber unchanged. At the same time, under the action of the second elastic member 52, the protrusion 20 will make the pull rod 561 move upward with the push rod 53. Finally, the sealing cover 17 seals the input end of the positive pressure connector to prevent the entry of bacteria.

[0041] The contents not described in detail in this specification belong to the prior art known to the professional and technical personnel in this field. In the description of the present invention, unless otherwise specified, "multiple" means two or more; the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A closed positive pressure joint, comprising a housing (1), characterized in that: The upper and lower ends of the shell (1) are respectively provided with an input port and an output port. A piston (2) is provided inside the shell (1). The outer periphery of the top of the piston (2) is sealed and fitted with the inner wall of the shell (1) to form a positive pressure chamber. A connecting column (19) is fixedly installed on the top of the piston (2). A push plate (3) is connected to the bearing at the bottom of the piston (2). A first elastic member (18) is installed between the bottom of the push plate (3) and the solid area at the bottom of the shell (1). An infusion channel (4) is fixedly connected inside the shell (1). The infusion channel (4) passes through the piston (2) to the positive pressure chamber. A pushing mechanism is installed on one side of the inside of the piston (2); The pushing mechanism comprises a first mounting groove (51), the first mounting groove (51) being provided at one side of the interior of the piston (2), a push rod (53) being connected in the first mounting groove (51) via a second elastic member (52), a sealing push plate (54) being fixedly connected to the top of the push rod (53), the sealing push plate (54) being sleeved on the periphery of the connecting column (19), a connecting groove (55) being provided at the bottom of the push rod (53), a pull-back assembly being installed in the connecting groove (55).

2. A closed positive pressure joint according to claim 1, characterized in that: The pull-back assembly comprises a pull rod (561), wherein the pull rod (561) is rotatably mounted in a connecting groove (55) via a torsion spring, wherein the pull rod (561) extends from the bottom of the piston (2) to a second mounting groove (562), wherein the second mounting groove (562) is provided at the top of the push plate (3), wherein the second mounting groove (562) is annularly provided and corresponds to the first mounting groove (51), wherein a guide groove A (563) is provided on an inner wall of one side of the second mounting groove (562), wherein the guide groove A (563) is designed as a spiral structure, and a guide rod A (564) is provided at the lower end of the pull rod (561), wherein the guide rod A (564) slides within a limited position in the guide groove A (563).

3. A closed positive pressure joint according to claim 2, characterized in that: A guide groove B (6) and a resistance groove (7) of a spiral structure are provided on the inner wall of the middle section of the housing (1); a guide rod B (8) is provided on one side of the outer periphery of the piston (2); the guide rod B (8) slides in the guide groove B (6); a resistance rod (9) is installed in the bottom cavity of the piston (2) by means of damping lateral resistance sliding; the outer end of the resistance rod (9) slides in the resistance groove (7); the resistance rod (9) and the guide rod B (8) have the same movement trajectory; the outer end of the resistance rod (9) is provided with an inclined surface structure with an inclined surface facing upwards; a protrusion A (10) is provided on one side of the inclined surface of the resistance rod (9).

4. A closed positive pressure joint according to claim 3, characterized in that: The upper and lower ends of the resistance grooves (7) are connected to resistance blocks (11) in a limited rotation manner through torsion springs. The upper resistance block (11) is an "L"-shaped structure. The resistance surface between the upper resistance block (11) and the protrusion A (10) is an inclined surface structure inclined upward. The lower resistance block (11) is a rectangular structure. The resistance surface between the lower resistance block (11) and the resistance rod (9) is a right-angle structure. The lower resistance block (11) rotates downward in one direction, and the upper resistance block (11) rotates upward in one direction.

5. A closed positive pressure joint according to claim 4, characterized in that: A protrusion B (12) is provided on one side of the middle section of the pull rod (561) corresponding to the inner end of the abutment rod (9), and protrusions (20) are alternately provided on the top side surface of the pull rod (561) and the inner wall of the connecting groove (55).

6. A closed positive pressure joint according to claim 5, characterized in that: A micro-osmotic fiber column (13) is installed on the top of the infusion channel (4); the bottom of the micro-osmotic fiber column (13) is connected to the infusion channel (4); and a liquid inlet is provided on one side of the infusion channel (4) below the micro-osmotic fiber column (13).

7. A closed positive pressure joint according to claim 6, characterized in that: A sealing block (14) is fixedly connected to the top of the piston (2); the top of the sealing block (14) is an inclined structure; guide grooves (15) are provided on both sides of the connecting column (19) and on the inner wall of the input port.

8. A closed positive pressure joint according to claim 7, characterized in that: A sealing gasket (16) is installed in the piston (2) and in contact with the periphery of the infusion channel (4). The sealing gasket (16) is used to seal the liquid inlet when the piston (2) moves upward.

9. A closed positive pressure joint according to claim 8, characterized in that: A sealing cover (17) is threadedly connected to the periphery of the input port.

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