CN219398385U - Negative pressure injector - Google Patents

Abstract

The utility model relates to a negative pressure injector, which comprises a core rod and a needle cylinder, wherein the needle cylinder is sleeved on the outer side of the core rod, and a pushing handle is arranged at the rear end of the core rod; two parallel baffles extending towards the circumferential outer side of the needle cylinder are arranged at the rear end of the needle cylinder, a clamping plate is arranged between the two baffles, and a protruding piece matched with the baffles is arranged on the side face of the clamping plate; the middle part of the clamping plate is provided with a hollow, the hollow is formed by overlapping a round hole and a strip-shaped hole, the strip-shaped hole extends outwards along the radial direction of the round hole, the round hole is matched with the inner hole of the needle cylinder in size, and the width of the strip-shaped hole is matched with the outer diameter of the core rod; the front end of the core rod is provided with a sealing ring; and a plurality of clamping grooves are formed in the core rod at intervals along the length direction, and the width of each clamping groove is matched with the thickness of the clamping plate. The injector has the advantages of simple structure, convenient operation and flexible use, and can reduce the fatigue of hands during the operation of medical growth time by prefabricated negative pressure.

Description

Negative pressure injector

Technical Field

The utility model relates to a negative pressure injector, and belongs to the technical field of medical appliances.

Background

When a doctor uses the syringe to draw blood, effusion or liquid medicine under negative pressure, because the viscosity of liquid drawn by some patients is larger or the liquid drawn amount is larger, the doctor needs to use larger suction force and pulls the core rod of the syringe for a long time, the process is time-consuming and labor-consuming, and simultaneously, the fatigue of the hands of the doctor is easily caused, and the skin damage and even tendon chronic strain can be caused for a long time. There is also a risk to the patient that the physician will be tiring, such as the failure of aspiration procedures that may cause unnecessary injury to the patient. In order to reduce the burden of medical staff and ensure the treatment of patients, the continuous negative pressure action is realized mainly by the design of a mechanical structure at present, such as the technical scheme disclosed in Chinese patent with publication number of CN114767969A, but the prior mechanical structure usually has no locking mechanism, so the defects of inconvenient operation and inflexible use exist.

The applicant searches and discovers that the Chinese patent with the publication number of CN113974764A discloses a negative pressure injector limited by a baffle plate, which adopts a needle cylinder and a push rod which are coaxially arranged, wherein the proximal end of the needle cylinder is provided with the baffle plate, and the baffle plate is provided with a locking mechanism; the push rod is provided with a plurality of limiting mechanisms which extend into the locking mechanism to form locking of axial movement of the push rod in the needle cylinder; the locking mechanism is arranged as a sliding push-torsion device of a push-lock structure and comprises a sliding block and a sliding groove, wherein the sliding block is arranged in the sliding groove, moves along the radial direction of the baffle plate and extends into the cavity of the needle cylinder, and the sliding block is locked by using a clamping groove and clamping key. The negative pressure injector scheme can limit the multiple sections, can meet the negative pressure required by different operations, but the structure of the locking mechanism is slightly complicated, and the applicant finds that the problems of inconvenient operation and limited flexibility still exist in the test process.

Disclosure of Invention

The utility model aims to solve the technical problems that: the injector is simple in structure, convenient to operate and flexible to use, and can relieve fatigue of hands when a doctor operates for a long time through prefabricated negative pressure.

In order to solve the technical problems, the technical scheme provided by the utility model is as follows: the negative pressure injector comprises a core rod and a needle cylinder, wherein the needle cylinder is sleeved on the outer side of the core rod, and a pushing handle is arranged at the rear end of the core rod; two parallel baffles extending towards the circumferential outer side of the needle cylinder are arranged at the rear end of the needle cylinder, a clamping plate is arranged between the two baffles, the clamping plate is inserted into the needle cylinder, and protruding pieces matched with the baffles are arranged on the side surfaces of the clamping plate;

the middle part of the clamping plate is provided with a hollow, the core rod penetrates through the hollow, the hollow is formed by overlapping a round hole and a strip-shaped hole, the strip-shaped hole extends outwards along the radial direction of the round hole, the round hole is matched with the inner hole of the needle cylinder in size, and the width of the strip-shaped hole is matched with the outer diameter of the core rod;

the front end of the core rod is provided with a sealing ring; and a plurality of clamping grooves are formed in the core rod at intervals along the length direction, and the width of each clamping groove is matched with the thickness of the clamping plate.

When the injector is used, an operator pushes the pushing handle to realize the pressurizing pushing action of the conventional injector, and the sealing ring is tightly matched with the inner wall of the syringe to play a role in sealing on the premise of meeting the relative sliding. In a normal state when the core rod performs push-pull action, the round hole in the hollow is coaxial with the inner hole of the needle cylinder and the outer diameter is similar, so that the sliding of the core rod in the needle cylinder is not influenced; when the clamping plate moves to a certain position, the clamping plate moves along the clamping groove on the core rod, the core rod is locked through the cooperation of the clamping plate and the clamping groove, and the core rod can not slide any more at the moment, so that negative pressure is formed in the space of the needle cylinder and the sealing ring structure (namely, the inside of the needle cylinder).

According to the utility model, the core bar is locked through the cooperation of the clamping plate and the clamping groove, the displacement of the core bar is not limited by manual operation of an operator, and the negative pressure is prefabricated in the needle cylinder, so that the effects of saving labor and stabilizing are achieved, the structure is simple, the use is convenient, the hand fatigue of the operator can be effectively reduced, and the medical risk caused by the fatigue of the operator is reduced.

Drawings

The utility model is further described below with reference to the accompanying drawings.

Fig. 1 is a schematic structural view of an embodiment of the present utility model.

Fig. 2 is a cross-sectional view of fig. 1.

FIG. 3 is a schematic diagram of the cooperation of the card and the card slot.

Fig. 4 is a schematic structural view of the card.

Reference numerals: 1. a core bar; 2. a needle cylinder; 3. a baffle; 4. a clamping plate; 5. pushing hands; 6. a projection; 7. a clamping groove; 8. a seal ring; 9. an outer luer structure; 10. and (5) hollowing.

Detailed Description

In the present utility model, one end of the injector, which is close to the core rod pusher, is defined as the rear end, and the other end is defined as the front end.

The embodiment relates to a negative pressure injector, as shown in fig. 1 and 2, comprising a core rod 1 and a needle cylinder 2, wherein the needle cylinder 2 is sleeved on the outer side of the core rod 1, a pushing handle 5 is arranged at the rear end of the core rod 1, the core rod 1 is preferably made of a PP material, the needle cylinder 2 is preferably made of a transparent material, and the outer wall of the needle cylinder 2 can be provided with scale marks for expressing corresponding volumes.

As shown in fig. 1 and 2, the rear end of the needle cylinder 2 is provided with two parallel baffles 3 extending towards the outer side of the circumference of the needle cylinder 2, a clamping plate 4 is arranged between the two baffles 3, the clamping plate 4 is inserted into the needle cylinder 2 from between the two baffles 3, the side surface of the clamping plate 4 is provided with a protruding piece 6 matched with the baffles 3, the protruding piece 6 can adopt a plurality of protruding points or protruding strips and the like, and a certain damping effect is generated when the clamping plate 4 slides between the two baffles 3, so that the clamping plate 4 is prevented from generating relative movement with the baffles 3 under the action of gravity, and the use experience is influenced. The clamping plate 4 is positioned outside the needle cylinder 2 in a normal state and inside the needle cylinder 2 in a part, so that the operation of a user is convenient. Preferably, an arrow indication mark is arranged on the side surface of the clamping plate 4 and used for indicating the moving direction of the operator identification clamping plate 4.

As shown in fig. 2-4, the middle part of the clamping plate 4 is provided with a hollow 10, the core rod 1 penetrates through the hollow 10, the hollow 10 is formed by overlapping a round hole and a strip hole, the round hole is matched with the inner hole of the needle cylinder 2 in size, the strip hole extends outwards along the radial direction of the round hole, and the width of the strip hole is matched with the outer diameter of the core rod 1.

The front end of the core bar 1 is provided with a sealing ring 8, and the sealing ring 8 is made of rubber material and is in interference airtight fit with the inside of the needle cylinder 2. In the implementation, a cake-shaped assembly structure can be arranged at the front end of the core rod 1 and assembled with the sealing ring 8, and the assembly state can be kept with the core rod 1 without separation when the core rod 1 performs push-pull action. In order to facilitate the judgment of the position of the sealing ring 8, the sealing ring 8 is preferably black. The front end of the sealing ring 8 is preferably conical, so that the sealing effect can be improved.

A plurality of clamping grooves 7 are formed in the core bar 1 at intervals along the length direction, and the width of each clamping groove 7 is matched with the thickness of the clamping plate 4. When the core bar 1 performs push-pull action, the round hole of the hollow 10 is coaxial with the inner hole of the needle cylinder 2, the core bar 1 is not influenced to slide in the needle cylinder 2, and in the locking state, the strip-shaped hole of the hollow 10 is sunk into the corresponding clamping groove 7 and limited through the damping action of the protruding piece 6, so that the core bar 1 is locked, the core bar 1 can not slide any more, negative pressure is formed in the needle cylinder 2 under the action of the sealing ring 8, the hand fatigue of an operator can be effectively reduced, and the medical risk brought by the fatigue of the operator is reduced.

As shown in fig. 2 and 3, in order to save materials, reduce weight and improve the suitability of operators, it is preferable that the cross section of the syringe 2 is in a cross rib structure, and the clamping groove 7 is arranged on the flange of the cross rib structure.

The present embodiment can also be modified as follows: as shown in fig. 2, the front end of the syringe 2 is provided with an outer luer structure 9, which is convenient for assembling with a needle head of a standard inner luer structure, and expands the application range.

The application method of the embodiment is as follows: the negative pressure injector is connected with the needle to penetrate into the target position, the core bar 1 is pulled to the clamping groove 7 of the core bar 1, the clamping plate 4 is moved to the clamping groove 7 direction to be at the locking position so as to clamp the core bar 1, the core bar 1 can not move freely, continuous negative pressure is formed in the injector at the moment, target liquid is sucked, and the needle is pulled out when the sucking amount is reached.

Claims (7)

1. The negative pressure injector comprises a core rod and a needle cylinder, wherein the needle cylinder is sleeved on the outer side of the core rod, and a pushing handle is arranged at the rear end of the core rod; the method is characterized in that: two parallel baffles extending towards the circumferential outer side of the needle cylinder are arranged at the rear end of the needle cylinder, a clamping plate is arranged between the two baffles, the clamping plate is inserted into the needle cylinder, and protruding pieces matched with the baffles are arranged on the side surfaces of the clamping plate;

the middle part of the clamping plate is provided with a hollow, the core rod penetrates through the hollow, the hollow is formed by overlapping a round hole and a strip-shaped hole, the strip-shaped hole extends outwards along the radial direction of the round hole, the round hole is matched with the inner hole of the needle cylinder in size, and the width of the strip-shaped hole is matched with the outer diameter of the core rod;

the front end of the core rod is provided with a sealing ring; and a plurality of clamping grooves are formed in the core rod at intervals along the length direction, and the width of each clamping groove is matched with the thickness of the clamping plate.

2. The negative pressure syringe of claim 1, wherein: the cross section of the core bar is of a cross rib structure, and the clamping groove is arranged on the flange of the cross rib structure.

3. The negative pressure syringe of claim 1, wherein: the needle cylinder is made of transparent materials.

4. A negative pressure syringe according to claim 3, characterized in that: the needle cylinder is provided with scale marks.

5. The negative pressure syringe according to any one of claims 1-4, wherein: the front end of the needle cylinder is of an external luer structure.

6. The negative pressure syringe according to any one of claims 1-4, wherein: the side of cardboard is equipped with the arrow mark for the direction of movement of sign cardboard.

7. The negative pressure syringe according to any one of claims 1-4, wherein: the front end of the sealing ring is conical.