CN213852512U - Medical equipment and injection pump - Google Patents

Abstract

An embodiment of the present application provides a medical apparatus, including: the sealing device comprises a shell, a fixing piece, a sealing ring and a connecting shaft; the shell is provided with an accommodating cavity and a first through hole communicated with the accommodating cavity; the fixing piece with a second through hole is connected with the shell; the sealing ring with a shaft hole is clamped between the shell and the fixing piece and is in insertion fit with the end face of at least one of the shell and the fixing piece, and the first through hole, the shaft hole and the second through hole are communicated with each other; a radial offset gap is formed among the sealing ring, the shell and the fixing piece along the radial direction of the shaft hole; the connecting shaft penetrates through the shaft hole and is in sealing contact with the sealing ring. The embodiment of the application also provides an injection pump, and the medical equipment and the injection pump provided by the embodiment of the application can improve the waterproof performance of the medical equipment.

Description

Medical equipment and injection pump

Technical Field

The application relates to the technical field of medical instruments, in particular to a medical device and an injection pump.

Background

The syringe pump is a medical device used in conjunction with a syringe, a driving mechanism of the syringe pump is generally arranged in a pump housing of the syringe pump, one end of a push-pull shaft is in driving connection with the driving mechanism, and the other end of the push-pull shaft extends out of the pump housing and is connected with a push-pull box assembly. Under the drive of the driving mechanism, the push-pull shaft can drive the push-pull box assembly to do linear motion, and the push-pull box assembly pushes the piston of the injector to move in the needle cylinder of the injector, so that high-precision and stable liquid transmission without pulsation is realized.

In the practical use process, the injection pump needs to be in contact with a cleaning agent, a disinfectant and the like, meanwhile, under certain unexpected conditions, liquid such as water and liquid medicine can be splashed onto the injection pump, and in order to prevent the liquid from permeating into the shell from the joint of the push-pull shaft and the pump shell to influence the performance of the injection pump, a sealing ring needs to be arranged at the joint of the push-pull shaft and the pump shell to achieve the aim of water prevention.

However, the structure of the seal ring in the related art is simple, and a certain assembly error exists in the assembly process, so that the situation that local contact is not tight or the outer ring of the seal ring is not compressed easily occurs between the push-pull shaft and the seal ring, and the risk of water leakage exists at the joint of the push-pull shaft and the pump shell.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is desirable to provide a medical device and a syringe pump capable of improving waterproof performance.

To achieve the above object, an embodiment of the present application provides a medical apparatus, including:

the shell is provided with an accommodating cavity and a first through hole communicated with the accommodating cavity;

the fixing piece is provided with a second through hole and is connected with the shell;

the sealing ring is clamped between the shell and the fixing piece and is in inserted fit with the end face of at least one of the shell and the fixing piece, and the first through hole, the shaft hole and the second through hole are communicated with each other; a radial offset gap is formed among the sealing ring, the shell and the fixing piece along the radial direction of the shaft hole;

the connecting shaft penetrates through the shaft hole and is in sealing contact with the sealing ring.

Another embodiment of the present application also provides a syringe pump, including:

a pump housing having an accommodating chamber and a first through hole communicating with the accommodating chamber; a syringe receiving space formed at one side of the pump housing;

a syringe clip including a fastening portion having a second through hole, and a clamping portion connected with the fastening portion; the fastening part is fastened and connected with the pump shell, the clamping part is positioned on one side of the fastening part close to the syringe accommodating space, and a syringe convex edge clamping space is formed between the clamping part and the pump shell;

the sealing ring is clamped between the pump shell and the syringe clamping piece and is in inserted fit with the end face of at least one of the pump shell and the syringe clamping piece, and the first through hole, the shaft hole and the second through hole are communicated with each other; a radial offset gap is formed between the sealing ring and the pump shell and between the sealing ring and the syringe clamping piece along the radial direction of the shaft hole;

a drive mechanism disposed in the receiving cavity;

the push-pull box assembly is arranged outside the pump shell;

the push-pull shaft penetrates through the shaft hole and is in contact with the shaft hole sealing ring; one end of the push-pull shaft is in driving connection with the driving mechanism, and the other end of the push-pull shaft is connected with the push-pull box assembly; under the driving of the driving mechanism, the push-pull shaft can drive the push-pull box assembly to perform linear motion along the axial direction of the shaft hole.

The utility model provides a medical equipment and syringe pump, through with the sealing washer at least with the terminal surface grafting cooperation of one of them of casing and mounting, and along the radial in shaft hole, radial skew clearance has between sealing washer and casing and the mounting, can guarantee when the sealing washer can with casing and mounting zonulae occludens, can also be at the in-process of assembling the connecting axle to the sealing washer, make the sealing washer can adjust the position of oneself through the skew in footpath, with the connecting axle of different size tolerance of self-adaptation, guarantee to keep sealed contact always between sealing washer and the connecting axle, therefore, can eliminate the harmful effects that assembly error brought, and then can improve medical equipment's waterproof performance.

Drawings

FIG. 1 is a schematic view of a medical device according to an embodiment of the present application with a pump door in a closed position and a syringe shown;

FIG. 2 is a schematic view of the medical device of FIG. 1 after the pump door has been opened;

FIG. 3 is a schematic view of the fastener shown in FIG. 1, showing the side of the fastener connected to the gasket;

FIG. 4 is a schematic view of the medical device of FIG. 1 with the mount and syringe omitted;

FIG. 5 is a schematic structural view of the seal ring shown in FIG. 4;

FIG. 6 is a cross-sectional view A-A of FIG. 5;

FIG. 7 is a schematic structural view of the housing of the medical device of FIG. 1, showing the pump door;

FIG. 8 is a front view, partially in section, of the medical device shown in FIG. 1;

FIG. 9 is an enlarged view of a portion of FIG. 8 at B;

FIG. 10 is a schematic view of the engagement of a housing, a sealing ring, and a mounting member in a medical device according to another embodiment of the present disclosure;

figure 11 is a schematic view of the push-pull box assembly shown in figure 1.

Description of the reference numerals

A medical device 100; a housing 10; a pump housing 10'; a box 10'; a housing chamber 11; a first through-hole 12; a third mating portion 13; the first seal rib 131; a third seal groove 132; a syringe accommodating space 14; a seal ring 20; a shaft hole 21; a first insertion part 22; a first seal groove 221; the third seal bead 222; a second mating portion 23; a second seal groove 231; the fourth sealing bead 232; the shaft seal rib 24; a fixing member 30; a syringe clip 30'; a fastening portion 301'; a clamping portion 302'; a second through-hole 31; a fourth mating portion 32; the second seal rib 321; a fourth seal groove 322; a connecting shaft 40; a push-pull shaft 40'; a push-pull box assembly 50; a claw clip 51; a clamp handle 60; a pump door 70; an injector 200; a syringe 201; a convex edge 202; a piston 203.

Detailed Description

It should be noted that, in the present application, technical features in examples and embodiments may be combined with each other without conflict, and the detailed description in the specific embodiment should be understood as an explanation of the gist of the present application and should not be construed as an improper limitation to the present application.

The medical device in the embodiment of the present application may be an infusion pump (including but not limited to a syringe pump), an anesthesia machine, a ventilator, a monitor, a diagnostic device, an ultrasound device, or the like, which requires a connection shaft to be disposed on a housing. For convenience of description, in the embodiments of the present application, a medical device is described as an example of a syringe pump.

Referring to fig. 1 to 9, a medical apparatus 100 according to an embodiment of the present application includes: the housing 10, the fixing member 30, the sealing ring 20, and the connecting shaft 40. The housing 10 has an accommodation chamber 11 and a first through-hole 12 communicating with the accommodation chamber 11. A fixing member 30 having a second through hole 31 is coupled to the housing 10. The sealing ring 20 having the shaft hole 21 is interposed between the housing 10 and the fixing member 30, and is in insertion fit with at least one end surface of the housing 10 and the fixing member 30, that is, the sealing ring 20 may be in insertion fit with only an end surface of the housing 10, may be in insertion fit with only an end surface of the fixing member 30, and may be in insertion fit with both the end surface of the housing 10 and the end surface of the fixing member 30. The first through-hole 12, the shaft hole 21, and the second through-hole 31 communicate with each other. The seal ring 20 has a radially offset gap with the housing 10 and the fixing member 30 in the radial direction of the shaft hole 21, and the connecting shaft 40 is inserted into the shaft hole 21 and is in sealing contact with the seal ring 20.

Specifically, according to different application scenarios, the connecting shaft 40 inserted into the shaft hole 21 may rotate in the shaft hole 21, or may perform a linear motion along the axial direction of the shaft hole 21, and the connecting shaft 40 may also be used only for connection, but not for movement in the shaft hole 21.

In the present embodiment, the sealing ring 20 and the fixing member 30 are both disposed outside the housing 10, and in other embodiments, the sealing ring 20 and the fixing member 30 may be disposed in the accommodating chamber 11. The fitting of the fixing member 30 with the housing 10 may function to compress the sealing ring 20.

Materials such as connecting axle, casing, mounting have just designed certain size assembly tolerance when the volume production, simultaneously, because also can have certain assembly error in the assembling process, so, appear local contact inseparable easily between connecting axle among the correlation technique and the sealing washer, perhaps the sealing washer outer lane does not have the condition that compresses tightly, and then makes near the risk that has the leakage of connecting axle.

Meanwhile, as the sealing ring 20 is in inserted fit with at least one end face of the shell 10 and the fixing element 30, the medical equipment of the embodiment can ensure that the sealing ring 20 can be tightly connected with the shell 10 and the fixing element 30, and meanwhile, because the sealing ring 20 has a radial offset gap with the shell 10 and the fixing element 30, when the connecting shaft 40 is assembled in the sealing ring 20, the sealing ring 20 can adjust the position of the connecting shaft 40 in the radial direction through offset, so as to be adaptive to the connecting shafts 40 with different dimensional tolerances and ensure that the sealing ring 20 and the connecting shaft 40 can always keep sealing contact, therefore, adverse effects caused by assembly errors can be eliminated, and further, the waterproof performance of the medical equipment can be improved.

The sealing ring 20 of the present embodiment may be a silicone sealing ring, and compared to a rubber sealing ring, the silicone sealing ring does not become invalid due to chemical reaction with lubricant, grease, detergent, disinfectant, and the like used in the medical device 100, and thus, reliability of use, cleaning, and disinfection of the medical device 100 in a medical environment can be ensured.

Referring to fig. 3, fig. 5 to fig. 7, and fig. 9, the sealing ring 20 of the present embodiment has a first end surface and a second end surface that are oppositely disposed, and the shaft hole 21 penetrates through the first end surface and the second end surface. The first end face has a first plugging portion 22 surrounding the shaft hole 21, the end face of the housing 10 has a third plugging portion 13 surrounding the first through hole 12, the first plugging portion 22 is plugged and matched with the third plugging portion 13, and a radial offset gap is formed between the first plugging portion 22 and the third plugging portion 13. The second end face is provided with a second inserting part 23 surrounding the shaft hole 21, the end face of the fixing member 30 is provided with a fourth inserting part 32 surrounding the second through hole, the second inserting part 23 is inserted and matched with the fourth inserting part 32, and a radial offset gap is formed between the second inserting part 23 and the fourth inserting part 32.

That is, the sealing ring 20 of the present embodiment is simultaneously inserted into and fitted with the end surface of the housing 10 and the end surface of the fixing member 30, so that the sealing ring 20 can be tightly connected with the housing 10 and the fixing member 30, and further, the sealing effect of the sealing ring 20 can be improved.

In other embodiments, the first plug-in portion 22 may be provided only on the first end face of the seal ring 20, the first plug-in portion 22 is in plug-in fit with the third plug-in portion 13 on the housing 10, and the second plug-in portion 23 is not provided on the second end face of the seal ring 20, and accordingly, the fourth plug-in portion 32 is not provided on the end face of the fixing member 30, and the second end face of the seal ring 20 is directly in sealing contact with the end face of the fixing member 30, or the second plug-in portion 23 may be provided only on the second end face of the seal ring 20, and the second plug-in portion 23 is in plug-in fit with the fourth plug-in portion 32 on the housing 10, and the first end face of the seal ring 20 is not provided with the first plug-in portion 22, and accordingly, the third plug-in portion 13 is not provided on the end face of the housing 10, and the first end face of the seal ring 20 is directly in sealing contact with the end face of the housing 10.

Referring to fig. 3, fig. 5 to fig. 7, and fig. 9, in the present embodiment, the first insertion part 22 includes a first sealing groove 221, and the third insertion part 13 includes a first sealing rib 131. The second socket 23 includes a second sealing groove 231, and the fourth socket 32 includes a second sealing rib 321.

Further, referring to fig. 7 and 9, the first inserting portion 22 of the present embodiment further includes a third sealing rib 222, the third inserting portion 13 further includes a third sealing groove 132, and the third sealing rib 222 is inserted into and matched with the third sealing groove 132. That is, in the present embodiment, both the seal groove and the seal rib are provided on the first end surface of the seal ring 20, and accordingly, both the seal rib and the seal groove are provided on the housing 10, whereby the sealing performance of the seal ring 20 can be further improved.

Referring to fig. 6, in the present embodiment, a portion of the first end surface of the seal ring 20 is recessed toward the second end surface to form a first seal groove 221 and a third seal rib 222 adjacent to the first seal groove 221, specifically, the third seal rib 222 of the present embodiment is located on a side of the first seal groove 221 away from the shaft hole 21, which is equivalent to the third seal rib 222 and is also a sidewall of the first seal groove 221 away from the shaft hole 21, and accordingly, the positions and shapes of the first seal rib 131 and the third seal groove 132 on the housing 10 correspond to the first seal groove 221 and the third seal rib 222 on the seal ring 20. By recessing a portion of the first end surface in a direction closer to the second end surface to form the first seal groove 221 and the third seal rib 222 adjacent to the first seal groove 221, machining and assembly of the seal ring 20 may be facilitated.

In other embodiments, the third sealing rib 222 may be located on a side of the first sealing groove 221 close to the shaft hole 21, or a part of the structure of the first end surface of the sealing ring 20 may be recessed toward the second end surface to form the first sealing groove 221, and a part of the structure of the first end surface of the sealing ring 20 may be protruded away from the second end surface to form the third sealing rib 222.

Referring to fig. 3 and 9, in the present embodiment, the fourth insertion part 32 further includes a fourth sealing groove 322, the second insertion part 23 further includes a fourth sealing rib 232, and the fourth sealing rib 232 is inserted into and matched with the fourth sealing groove 322. That is, in the present embodiment, both the seal groove and the seal rib are provided on the second end surface of the seal ring 20, and accordingly, both the seal rib and the seal groove are provided on the fixing member 30, so that the sealing performance of the seal ring 20 can be further improved.

Referring to fig. 6, in the present embodiment, a portion of the second end surface of the sealing ring 20 is recessed toward the direction close to the first end surface to form a second sealing groove 231 and a fourth sealing rib 232 adjacent to the second sealing groove 231, specifically, the fourth sealing rib 232 of the present embodiment is located on a side of the second sealing groove 231 away from the shaft hole 21, which is equivalent to the fourth sealing rib 232 and is also a sidewall of the second sealing groove 231 away from the shaft hole 21, and accordingly, the positions and shapes of the second sealing rib 321 and the fourth sealing groove 322 on the fixing member 30 correspond to the second sealing groove 231 and the fourth sealing rib 232 on the sealing ring 20. By recessing a portion of the second end surface in a direction close to the first end surface to form the second seal groove 231 and the fourth seal rib 232 adjacent to the second seal groove 231, the machining and assembly of the seal ring 20 may be facilitated.

The radial offset gaps are provided between the first seal groove 221 and the first seal rib 131, between the second seal groove 231 and the second seal rib 321, between the third seal rib 222 and the third seal groove 132, and between the fourth seal rib 232 and the fourth seal groove 322 in this embodiment, however, since the third sealing rib 222 of the present embodiment is located on the side of the first sealing groove 221 away from the shaft hole 21, the fourth sealing rib 232 is located on the side of the second sealing groove 231 away from the shaft hole 21, in practical use, therefore, it may be only the first seal groove 221 and the first seal rib 131 and the second seal groove 231 and the second seal rib 321 have radially offset gaps, no radial offset gaps may be provided between the third seal rib 222 and the third seal groove 132, and between the fourth seal rib 232 and the fourth seal groove 322, that is, as long as a radial offset gap is ensured between the seal groove closest to the connecting shaft 40 and the seal rib.

In other embodiments, the fourth sealing rib 232 may be located on a side of the second sealing groove 231 close to the shaft hole 21, or a part of the structure of the second end surface of the sealing ring 20 may be recessed toward the first end surface to form the second sealing groove 231, and a part of the structure of the second end surface of the sealing ring 20 may be protruded away from the first end surface to form the fourth sealing rib 232.

It is understood that in other embodiments, the third socket 13 may have only the first sealing rib 131 without the third sealing groove 132, and accordingly, the first socket 22 may have only the first sealing groove 221 without the third sealing rib 222, and the fourth socket 32 may have only the second sealing rib 321 without the fourth sealing groove 322, and accordingly, the second socket 23 may have only the second sealing groove 231 without the fourth sealing rib 232.

In other embodiments, the third socket 13 may include the first sealing groove 221 and the first socket 22 includes the first sealing rib 131, or the fourth socket 32 may include the second sealing groove 231 and the second socket 23 may include the second sealing rib 321. Further, referring to fig. 10, in an embodiment, the third mating part 13 may only have a first sealing groove, the first mating part 22 may only have a first sealing rib, the fourth mating part 32 may only have a second sealing groove, and the second mating part 23 may only have a second sealing rib.

In summary, in the present embodiment, one of the third insertion part 13 and the first insertion part 22 at least includes the first sealing groove 221, and the other of the third insertion part 13 and the first insertion part 22 at least includes the first sealing rib 131 engaged with the first sealing groove 221. One of the fourth mating part 32 and the second mating part 23 at least includes a second sealing groove 231, and the other of the third mating part 13 and the second mating part 23 at least includes a second sealing rib 321 engaged with the second sealing groove 231.

Referring to fig. 5, 6 and 9, in the present embodiment, the inner wall of the shaft hole 21 has an annular shaft sealing rib 24 protruding toward the center of the shaft hole 21, and the shaft sealing rib 24 is in sealing contact with the connecting shaft 40, specifically, in order to improve the sealing performance, the inner diameter of the shaft sealing rib 24 may be slightly smaller than the outer diameter of the connecting shaft 40, and when the connecting shaft 40 is inserted into the shaft sealing rib 24, the shaft sealing rib 24 is in sealing contact with the connecting shaft by generating a certain elastic deformation. The shaft sealing rib 24 may also be a wear-resistant shaft sealing rib, that is, the wear-resistant shaft sealing rib may be made of a wear-resistant material, that is, the wear-resistant shaft sealing rib may be made of a material different from that of other portions of the sealing ring 20, so as to improve the wear-resistant effect of the sealing ring 20 while ensuring the sealing effect. The advantage of setting up the axle sealing muscle 24 lies in, on the one hand, can reduce the area of contact of connecting axle 40 and sealing washer 20, in order to reduce the resistance of connecting axle 40 in the motion process, prevent the condition of locking to appear between connecting axle 40 and the sealing washer 20, on the other hand, axle sealing muscle 24 also can prevent that outside impurity from getting into and holding chamber 11, and the third aspect, some lubricating grease will generally be paintd on the connecting axle 40, and axle sealing muscle 24 can prevent most lubricating grease from oozing from the junction of connecting axle 40 and sealing washer 20, especially when connecting axle 40 need carry out linear motion to the direction of keeping away from casing 10, axle sealing muscle 24 can prevent lubricating grease as far as possible to be taken outside casing 10 by connecting axle 40.

In addition, according to different use scenarios, the sealing contact between the shaft sealing rib 24 and the connecting shaft 40 may be a sealing line contact or a sealing surface contact, for example, for the sealing line contact, the cross section of the shaft sealing rib 24 may be V-shaped or U-shaped, that is, the cross section of the shaft sealing rib 24 and the connecting shaft 40 are all point contacts, so that the shaft sealing rib 24 may form a line contacting with the connecting shaft 40 along the circumferential direction of the connecting shaft 40, wherein the shaft sealing rib 24 having the V-shaped cross section may be suitable for being matched with the connecting shaft 40 with a low movement speed, and the shaft sealing rib 24 having the U-shaped cross section may be suitable for being matched with the connecting shaft 40 with a high movement speed. For the sealing surface contact, the cross section of the shaft sealing rib 24 may be rectangular, that is, the shaft sealing rib 24 may form a surface contacting with the connecting shaft 40 along the circumferential direction of the connecting shaft 40, and the sealing surface contact is suitable for matching with the connecting shaft 40 with heavy load at low speed.

In this embodiment, two shaft seal ribs 24 are provided on the inner wall of the shaft hole 21, the two shaft seal ribs 24 are arranged at intervals, and part of the lubricating grease can be retained at the intervals of the two shaft seal ribs 24, so that the lubricating grease can be prevented from being brought out of the housing 10 by the connecting shaft 40 while the connecting shaft 40 is lubricated.

In other embodiments, the number of the shaft sealing ribs 24 may be one, or may be more than two, which is not limited herein.

Referring to fig. 5, 6 and 9, in an embodiment, the sealing ring 20 has a first end surface and a second end surface opposite to each other, and the shaft hole 21 penetrates through the first end surface and the second end surface; the inner wall of the shaft hole 21 is provided with two shaft sealing ribs 24 protruding towards the center of the shaft hole 21; the partial structure of the first end face is recessed toward the direction close to the second end face to form a first sealing groove 221 surrounding the circumference of the shaft hole 21 and a third sealing rib 222 surrounding the first sealing groove 221 on the side far from the shaft hole 21, the partial structure of the outer end face of the housing 10 is recessed toward the direction close to the accommodating cavity 11 to form a first sealing rib 131 surrounding the circumference of the first through hole 12 and a third sealing groove 132 surrounding the first sealing rib 131 on the side far from the first through hole 12, the first sealing groove 221 is in inserted fit with the first sealing rib 131, the third sealing rib 222 is in inserted fit with the third sealing groove 132, and radial offset gaps are formed between the first sealing groove 221 and the first sealing rib 131 and between the third sealing rib 222 and the third sealing groove 132. The partial structure of the second end face is recessed toward the direction close to the first end face to form a second sealing groove 231 surrounding the shaft hole 21 and a fourth sealing rib 232 surrounding the second sealing groove 231 and being far away from the shaft hole 21, the partial structure of the end face of the fixing member 30 close to the sealing ring 20 is recessed toward the direction far away from the sealing ring 20 to form a second sealing rib 321 surrounding the second through hole 31 and a fourth sealing groove 322 surrounding the second sealing rib 321 and being far away from the second through hole 31, the second sealing groove 231 is in inserting fit with the second sealing rib 321, the fourth sealing rib 232 is in inserting fit with the fourth sealing groove 322, and radial offset gaps are formed between the second sealing groove 231 and the second sealing rib 321 and between the fourth sealing rib 232 and the fourth sealing groove 322. The two shaft sealing ribs 24 are arranged at intervals and are in sealing contact with the connecting shaft 40.

Referring to fig. 1 to 9, in one embodiment, the medical apparatus 100 is a syringe pump, and for convenience of description, the housing 10 may be referred to as a pump housing 10', the connecting shaft 40 may be referred to as a push-pull shaft, and the syringe pump further includes a driving mechanism (not shown) and a push-pull cassette assembly 50. The driving mechanism is arranged in the accommodating cavity 11, one end of the push-pull shaft is in driving connection with the driving mechanism, and the other end of the push-pull shaft is connected with the push-pull box assembly 50. Under the drive of the driving mechanism, the push-pull shaft can drive the push-pull box assembly 50 to perform linear motion along the axial direction of the shaft hole 21.

Specifically, the push-pull box assembly 50 is mainly used for being connected with the piston 203 of the injector 200, the push-pull shaft can drive the push-pull box assembly 50 to perform linear motion under the driving of the driving mechanism, and the push-pull box assembly 50 pushes the piston 203 to move in the needle cylinder 201 of the injector 200, so that high-precision, stable and pulsation-free liquid transmission is realized.

The syringe pump of this embodiment further includes a pump door 70, and the pump door 70 is rotatably coupled to the pump housing 10' such that the syringe 200 can be accessed when the pump door 70 is opened. In other embodiments, the pump door 70 may not be provided.

Further, referring to fig. 1 to 3, the pump housing 10 ' has a syringe receiving space 14 at one side thereof, the fixing member 30 may be a syringe clip 30 ', the syringe clip 30 ' includes a fastening portion 301 ' and a holding portion 302 ' connected to the fastening portion 301 ', and the fastening portion 301 ' has a second through hole 31. The fastening part 301 'is connected with the pump case 10', the holding part 302 'is arranged at one side of the fastening part 301' near the injector containing space 14, and an injector convex edge holding space is formed between the holding part 302 'and the pump case 10'. The syringe clip 30' may grip a ledge 202 on the syringe 200 to position the syringe 200 when the syringe 200 is mounted on the syringe pump. The syringe clip 30' is used as the fixing member 30 of the packing 20, so that the trouble of separately installing the fixing member 30 can be eliminated, and the structure of the syringe pump can be more compact. In other embodiments, the fixing member 30 may be separately provided.

Referring to fig. 1 to 3, 11, in an embodiment, the housing 10 may also be a box 10 "of the push-pull box assembly 50, the box 10" having two first through going holes 12. For convenience of description, in the present embodiment, the connecting shaft 40 is referred to as a jaw shaft of the push-pull box assembly 50, the seal ring 20 is referred to as a jaw seal ring, and the fixing member 30 is referred to as a jaw fixing member. The push-pull box assembly 50 further comprises a jaw clamp drive assembly and jaw clamps 51. The number of the jaw clamp shaft, the jaw clamp fixing piece, the jaw clamp and the jaw clamp sealing ring is two, wherein for the jaw clamp fixing piece, the two jaw clamp fixing pieces can be connected with each other to form a whole. The first through hole 12, the jaw clamp shaft, the jaw clamp fixing piece, the jaw clamp 51 and the jaw clamp sealing ring correspond to each other one to one. The jaw clamp driving assembly is arranged in the accommodating cavity 11, one end of the jaw clamp shaft is in driving connection with the jaw clamp driving assembly, and the other end of the jaw clamp shaft is connected with the corresponding jaw clamp 51. The jaw drive assembly drives the two jaw clamps 51 to rotate relative to the cartridge 10 "to grip or release the plunger 203 of the syringe 200.

Referring to fig. 2, in one embodiment, the syringe pump further includes a clip handle 60, and for convenience of description, the connecting shaft 40 is referred to as a clip handle shaft in this embodiment. One end of the clip stem is disposed in the accommodation chamber 11, and the other end of the clip stem is connected to the clip handle 60. The shaft of the clamp holder 60 rotates or moves linearly relative to the pump housing to drive the clamp holder 60 to clamp or unclamp the syringe 201 of the injector 200.

Specifically, the clamp holder 60 is mainly used to clamp or unclamp the syringe 201 of the injector 200. referring to fig. 2, in one embodiment, the clamp holder shaft rotates relative to the pump housing, the clamp holder 60 clamps the syringe 201 of the injector 200 when the operator rotates the clamp holder 60 in a direction toward the injector 200, and the clamp holder 60 unclamps the clamped syringe 201 of the injector 200 when the operator rotates the clamp holder 60 in a direction away from the injector 200.

In another embodiment, the grip holder may be linearly moved in a direction perpendicular to the syringe 200 to grip or release the cylinder 201 of the syringe 200, i.e., the grip holder is of a pull type, and when the grip holder is pulled outward, the cylinder 201 of the syringe 200 may be released, and when the grip holder 60 is pushed in a reverse direction, the grip holder 60 may grip the cylinder 201 of the syringe 200.

Referring to fig. 1 to 9, an embodiment of the present application provides a syringe pump, including: a pump housing 10 ', a syringe clip 30 ', a seal 20, a drive mechanism, a push-pull box assembly 50, and a push-pull shaft 40 '. The pump housing 10' has a receiving chamber 11, and a first through hole 12 communicating with the receiving chamber 11. One side of the pump housing 10' has a syringe receiving space 14. The syringe clip 30 'includes a fastening portion 301' having a second through hole 31, and a clamping portion 302 'connected to the fastening portion 301'; the fastening portion 301 'is fastened to the pump housing 10', the holding portion 302 'is located on a side of the fastening portion 301' close to the syringe accommodating space 14, and a syringe flange holding space is formed between the holding portion 302 'and the pump housing 10'. The sealing ring 20 with a shaft hole 21 is clamped between the pump shell 10 'and the injector clamping piece 30', and is at least in inserted fit with the end surface of one of the pump shell 10 'and the injector clamping piece 30', and the first through hole 12, the shaft hole 21 and the second through hole 31 are communicated with each other; the seal ring 20 is radially offset from the pump housing 10 'and the syringe clip 30' in the radial direction of the axial bore 21. The driving mechanism is arranged in the accommodating cavity 11; the push-pull box assembly 50 is arranged outside the pump shell 10'; the push-pull shaft 40' is inserted into the shaft hole 21 and contacts the shaft hole 21 with the seal ring 20. One end of the push-pull shaft 40 'is drivingly connected to the drive mechanism, and the other end of the push-pull shaft 40' is connected to the push-pull box assembly 50. Under the driving of the driving mechanism, the push-pull shaft 40' can drive the push-pull box assembly 50 to perform linear motion along the axial direction of the shaft hole 21.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (20)

1. A medical device, comprising:

the shell is provided with an accommodating cavity and a first through hole communicated with the accommodating cavity;

the fixing piece is provided with a second through hole and is connected with the shell;

the sealing ring is clamped between the shell and the fixing piece and is in inserted fit with the end face of at least one of the shell and the fixing piece, and the first through hole, the shaft hole and the second through hole are communicated with each other; a radial offset gap is formed among the sealing ring, the shell and the fixing piece along the radial direction of the shaft hole;

the connecting shaft penetrates through the shaft hole and is in sealing contact with the sealing ring.

2. The medical device of claim 1, wherein the sealing ring has first and second oppositely disposed end surfaces, and the axial bore extends through the first and second end surfaces;

the first end face is provided with a first inserting part arranged around the shaft hole, the end face of the shell is provided with a third inserting part arranged around the first through hole, the first inserting part is in inserting fit with the third inserting part, and a radial offset gap is formed between the first inserting part and the third inserting part; and/or the presence of a gas in the gas,

the second end face is provided with a second inserting portion surrounding the periphery of the shaft hole, the end face of the fixing piece is provided with a fourth inserting portion surrounding the periphery of the second through hole, the second inserting portion is in inserting fit with the fourth inserting portion, and a radial offset gap is formed between the second inserting portion and the fourth inserting portion in inserting.

3. The medical device of claim 2, wherein one of the first and third mating parts comprises at least a first sealing groove, and the other of the first and third mating parts comprises at least a first sealing rib that mates with the first sealing groove;

one of the second insertion part and the fourth insertion part at least comprises a second sealing groove, and the other one of the second insertion part and the fourth insertion part at least comprises a second sealing rib matched with the second sealing groove.

4. The medical device of claim 3, wherein the first socket comprises the first sealing groove and the third socket comprises the first sealing rib;

the second plug part comprises the second sealing groove, and the fourth plug part comprises the second sealing rib.

5. The medical device of claim 4, wherein the first mating part further comprises a third sealing rib, the third mating part further comprising a third sealing groove, the third sealing rib being in mating engagement with the third sealing groove.

6. The medical device of claim 5, wherein a portion of the structure of the first end face is recessed in a direction proximate the second end face to form the first seal groove and the third seal rib adjacent the first seal groove.

7. The medical device of claim 4, wherein the fourth mating portion further comprises a fourth sealing groove, the second mating portion further comprising a fourth sealing rib, the fourth sealing rib in mating engagement with the fourth sealing groove.

8. The medical device of claim 7, wherein a portion of the structure of the second end face is recessed in a direction proximate the first end face to form the second seal groove and the fourth seal rib adjacent the second seal groove.

9. The medical device according to any one of claims 1 to 8, wherein an inner wall of the shaft hole has an annular shaft sealing rib projecting toward a center of the shaft hole, the shaft sealing rib being in sealing contact with the connecting shaft.

10. The medical device of claim 9, wherein the sealing contact of the shaft sealing rib with the connecting shaft is a sealing line contact or a sealing surface contact.

11. The medical device of claim 9, wherein the shaft sealing rib has a cross-sectional shape that is V-shaped, U-shaped, or rectangular.

12. The medical device of claim 9, wherein the number of the shaft sealing ribs is at least two, and at least two of the shaft sealing ribs are spaced apart.

13. The medical device of claim 9, wherein the shaft seal bead is a wear resistant shaft seal bead.

14. The medical device of any one of claims 1-8, wherein the seal ring is a silicone seal ring.

15. The medical device of claim 1, wherein the sealing ring has first and second oppositely disposed end surfaces, and the axial bore extends through the first and second end surfaces; the inner wall of the shaft hole is provided with two shaft sealing ribs protruding towards the center of the shaft hole;

the partial structure of the first end face is sunken towards the direction close to the second end face so as to form a first sealing groove arranged around the shaft hole and a third sealing rib arranged on one side, far away from the shaft hole, of the first sealing groove, the partial structure of the outer end face of the shell is sunken towards the direction close to the accommodating cavity so as to form a first sealing rib arranged around the first through hole and a third sealing groove arranged on one side, far away from the first through hole, of the first sealing rib, the first sealing groove is in splicing fit with the first sealing rib, the third sealing rib is in splicing fit with the third sealing groove, and radial offset gaps are formed between the first sealing groove and the first sealing rib and between the third sealing rib and the third sealing groove;

the part of the structure of the second end face is sunken towards the direction close to the first end face so as to form a second sealing groove arranged around the shaft hole and a fourth sealing rib arranged around the second sealing groove and far away from one side of the shaft hole, the part of the structure of the end face of the fixing part close to one side of the sealing ring is sunken towards the direction far away from the sealing ring so as to form a second sealing rib arranged around the second through hole and a fourth sealing groove arranged around the second sealing rib and far away from one side of the second through hole, the second sealing groove is in splicing fit with the second sealing rib, the fourth sealing rib is in splicing fit with the fourth sealing groove, and radial offset gaps are formed between the second sealing groove and the second sealing rib and between the fourth sealing rib and the fourth sealing groove;

two the axle seal muscle interval sets up, and all with connecting axle sealing contact.

16. The medical device according to any one of claims 1-8, wherein the medical device is a syringe pump, the housing is a pump housing, the connecting shaft is a push-pull shaft, and the syringe pump further comprises a drive mechanism and a push-pull box assembly;

the driving mechanism is arranged in the accommodating cavity, one end of the push-pull shaft is in driving connection with the driving mechanism, and the other end of the push-pull shaft is connected with the push-pull box assembly;

under the driving of the driving mechanism, the push-pull shaft can drive the push-pull box assembly to perform linear motion along the axial direction of the shaft hole.

17. The medical device according to claim 16, wherein the pump housing has a syringe receiving space at one side thereof, the fixing member is a syringe clip including a fastening portion having the second through-hole and a grip portion connected to the fastening portion;

the fastening part is fastened and connected with the pump shell, the clamping part is positioned on one side of the fastening part close to the injector containing space, and an injector convex edge clamping space is formed between the clamping part and the pump shell.

18. The medical device of any one of claims 1-8, wherein the medical device is a syringe pump, the housing is a pump housing, the connecting shaft is a clamp shaft, and the syringe pump further comprises a clamp handle;

one end of the clamping handle shaft is arranged in the accommodating cavity, and the other end of the clamping handle shaft is connected with the clamping handle;

the clamping handle shaft rotates or linearly moves relative to the pump shell to drive the clamping handle to clamp or release the syringe of the injector.

19. The medical device of any of claims 1-8, wherein the medical device is a syringe pump comprising a push-pull cassette assembly, the housing is a cassette body of the push-pull cassette assembly, the cassette body having two of the first through holes; the connecting shaft is a jaw clamping shaft of the push-pull box assembly, the sealing ring is a jaw clamping sealing ring, and the fixing piece is a jaw clamping fixing piece; the push-pull box assembly further comprises a jaw clamp driving assembly and a jaw clamp;

the number of the jaw clamp shaft, the jaw clamp fixing piece, the number of the jaw clamp and the number of the jaw clamp sealing rings are two, and the first through hole, the jaw clamp shaft, the jaw clamp fixing piece, the jaw clamp and the jaw clamp sealing rings are in one-to-one correspondence;

the jaw clamp driving assembly is arranged in the accommodating cavity, one end of the jaw clamp shaft is in driving connection with the jaw clamp driving assembly, and the other end of the jaw clamp shaft is connected with the corresponding jaw clamp; the jaw driving assembly drives the two jaw clamps to rotate relative to the box body so as to clamp or release a piston of the syringe.

20. A syringe pump, comprising:

a pump housing having an accommodating chamber and a first through hole communicating with the accommodating chamber; a syringe receiving space formed at one side of the pump housing;

a syringe clip including a fastening portion having a second through hole, and a clamping portion connected with the fastening portion; the fastening part is fastened and connected with the pump shell, the clamping part is positioned on one side of the fastening part close to the syringe accommodating space, and a syringe convex edge clamping space is formed between the clamping part and the pump shell;

the sealing ring is clamped between the pump shell and the syringe clamping piece and is in inserted fit with the end face of at least one of the pump shell and the syringe clamping piece, and the first through hole, the shaft hole and the second through hole are communicated with each other; a radial offset gap is formed between the sealing ring and the pump shell and between the sealing ring and the syringe clamping piece along the radial direction of the shaft hole;

a drive mechanism disposed in the receiving cavity;

the push-pull box assembly is arranged outside the pump shell;

the push-pull shaft penetrates through the shaft hole and is in contact with the shaft hole sealing ring; one end of the push-pull shaft is in driving connection with the driving mechanism, and the other end of the push-pull shaft is connected with the push-pull box assembly; under the driving of the driving mechanism, the push-pull shaft can drive the push-pull box assembly to perform linear motion along the axial direction of the shaft hole.

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