CN218922650U

CN218922650U - Novel biopsy needle

Info

Publication number: CN218922650U
Application number: CN202122359337.XU
Authority: CN
Inventors: 黄杨淇; 黄文侨
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-09-28
Filing date: 2021-09-28
Publication date: 2023-04-28
Anticipated expiration: 2031-09-28

Abstract

The utility model discloses a novel biopsy needle, which comprises a needle cylinder, an outer needle, a piston rod and an inner needle, wherein the outer needle is fixedly connected to the front part of the needle cylinder; a through hole is formed in the piston rod along the length direction, the through hole extends from the head of the piston rod to the tail of the piston rod, and the inner needle is arranged in the through hole in a penetrating manner; the tip of the inner needle can be accommodated in the inner cavity of the outer needle, and the rubber sleeve can be propped against and sealed on the outer side wall of the inner needle; the tail part of the inner needle is fixedly connected with a fixing seat, and the fixing seat is detachably and fixedly connected with a through hole opening of the through hole at the tail part of the piston rod; compared with the prior art, the utility model has the advantages that the inner needle which can be detached from the piston rod is arranged, so that the inner needle is prevented from influencing the smooth movement of the piston rod in the outer needle when the eluent is sucked back and forth, the histological sample can be obtained, and the cytological sample can be conveniently obtained through elution.

Description

Novel biopsy needle

Technical Field

The utility model relates to the field of medical instruments, in particular to a novel biopsy needle.

Background

The biopsy needle is a medical instrument, is suitable for various organs such as kidney, liver, lung, mammary gland, thyroid gland, prostate gland, pancreas, testis, uterus, ovary, body surface and the like, and can be used for sampling living tissues and sucking cells of cone tumors, unidentified tumors and the like. Clinically, in order to determine the nature of a tumor when examining a patient with a tumor, it is necessary to take some living tissue from the affected part with a biopsy needle for examination. Biopsies are classified by examination sample: cytological biopsies, histological biopsies. Cytological examination refers to observation of pathological morphology and qualitative diagnosis of cells extracted by puncture, and is mainly applied to diagnosis of tumors. Histological biopsy is a procedure in which tissue at a puncture site is removed by a biopsy needle, and a pathological examination is performed to confirm whether or not canceration has occurred.

The tissue biopsy mainly adopts a biopsy needle, most of the current biopsy needles can only take out tissues through histological biopsy, the structure of the adopted negative pressure biopsy needle comprises a needle cylinder, an outer needle, an inner needle and a piston rod, the inner needle is fixedly connected in the piston rod, during puncture, the inner needle fills the inner cavity of the outer needle to avoid containing non-target tissues in the outer needle during puncture, after reaching a puncture part, the piston rod moves backwards to form negative pressure, at the moment, the inner needle also moves backwards, a doctor drives the biopsy needle to carry out lifting and inserting actions, at the moment, the tissues of the target part can enter the outer needle under the action of the negative pressure, then the biopsy needle is pulled out of the body, the piston rod is pushed forwards to eject the taken tissues, and the next histological examination is carried out.

If the inner needle is prepared for cytological examination of residual cells in the inner cavity of the outer needle, the outer wall of the inner needle and the inner cavity of the needle cylinder, the needle head of the outer needle is required to be contained in the eluent, and residual cells are eluted through the reciprocating push-pull piston rod, but at the moment, because the inner needle is always contained in the outer needle, the gap between the inner needle and the outer needle of the piston rod is extremely small when the piston rod is pushed forward, liquid or gas in the needle cylinder cannot be smoothly discharged when the piston rod is pushed forward, so that the piston rod moves very unsmoothly, the resistance of the reciprocating push-pull piston rod is extremely large, and the operation is inconvenient.

In view of this, the applicant has made intensive studies on the above-mentioned defects in the prior art.

Disclosure of Invention

The utility model mainly aims to provide a novel biopsy needle which has the characteristic of being convenient for cytologic detection after taking out biopsy tissue and is convenient for elution operation.

In order to achieve the above object, the solution of the present utility model is:

the novel biopsy needle comprises a needle cylinder, an outer needle, a piston rod and an inner needle, wherein the outer needle is fixedly connected to the front part of the needle cylinder, the front part of the piston rod is arranged inside the needle cylinder and can slide along the length direction of the needle cylinder, and the front part of the piston rod is provided with a rubber sleeve in sealing connection with the inner wall of the needle cylinder; the inner needle is arranged in the through hole in a penetrating way; the tip of the inner needle can be accommodated in the inner cavity of the outer needle, and the rubber sleeve can be propped against and sealed on the outer side wall of the inner needle; the inner needle tail part is fixedly connected with a fixing seat, and the fixing seat is detachably and fixedly connected with a through hole opening of the through hole at the tail part of the piston rod.

Further, the needle seat of the outer needle is detachably and fixedly connected with the front part of the needle cylinder.

Further, be provided with the card strip on the piston rod, be provided with spacing tooth on the card strip, when forming the negative pressure in the cylinder, spacing tooth is supported and is propped on the cylinder in order to restrict the piston rod resilience.

Further, a spring is sleeved on the lateral wall of the outer side of the piston rod, a limiting part is further arranged on the piston rod, a strip-shaped groove is formed in the needle cylinder, the length direction of the strip-shaped groove is parallel to the moving direction of the piston rod, and the limiting part is slidably arranged in the strip-shaped groove along with the movement of the piston rod;

a locking switch is also arranged between the needle cylinder and the piston rod; the piston rod is provided with an initial position and a negative pressure position, and is fixedly connected with the needle cylinder through the locking switch when the piston rod is at the initial position; after the trigger of the locking switch is released, the spring drives the piston rod to move to the negative pressure position from the initial position to the back side so as to form negative pressure in the needle cylinder.

Further, the needle cylinder comprises a first outer wall section and a second outer wall section, the second outer wall section is arranged on one side, far away from the outer needle, of the first outer wall section, the rubber sleeve of the piston rod is in sliding connection with the first outer wall section, and the inner diameter of the second outer wall section is larger than the outer diameter of the first outer wall section.

Further, the spring is a compression spring, the compression spring is accommodated in the second outer wall section, and two ends of the compression spring respectively abut against the piston rod.

Further, the limiting part is a limiting rod fixedly arranged on the piston rod, the strip-shaped groove is a strip-shaped through groove formed on the needle cylinder, and the limiting part is arranged in the strip-shaped groove in a penetrating mode.

After the structure is adopted, the novel biopsy needle has at least the following beneficial effects:

1. after the biopsy needle is taken out of the patient, the taken tissue in the outer needle is ejected out by pushing the piston rod and the inner needle together forwards; because the inner needle is detachably connected with the piston rod, the inner needle can be completely separated from the piston rod or can be moved backwards until the inner needle is separated from the outer needle, when the needle point of the outer needle is positioned in the eluent, the piston rod can smoothly suck the eluent, so that the inner wall of the outer needle or cells positioned in the needle cylinder can be transferred into the eluent, and the subsequent cytological examination is facilitated.

2. The rubber sleeve is propped against and sealed on the outer side wall of the inner needle, so that when the inner needle passes through the rubber sleeve, the rubber sleeve can be sealed with the inner needle, and the sealing effect of the inner cavity of the needle cylinder is ensured; after the inner needle is separated from the rubber sleeve, the rubber sleeve can be closed under the action of self elasticity due to the small diameter of the inner needle, so that the sealing effect is ensured. And when the inner needle is withdrawn, the rubber sleeve which is propped against and sealed on the outer wall of the inner needle can scrape off tissue cells attached on the outer wall of the inner needle to a certain extent, so that the sample collection of cytological examination is facilitated. The fixing seat plays a role in firmly connecting the inner needle with the fixing seat, and simultaneously, an operator can conveniently drive the inner needle backwards.

3. After the outer needle of the puncture needle is punctured in place, the doctor drives the piston rod to move backwards, so that negative pressure is formed inside the needle cylinder, and the limiting teeth are propped against the needle cylinder, so that the negative pressure is still maintained after the hand is loosened.

4. By providing the second outer wall section with an inner diameter larger than the first outer wall section, the spring can be more conveniently installed.

Compared with the prior art, the utility model has the advantages that the inner needle which can be detached from the piston rod is arranged, so that the inner needle is prevented from influencing the smooth movement of the piston rod in the outer needle when the eluent is sucked back and forth, the histological sample can be obtained, and the cytological sample can be conveniently obtained through elution.

Drawings

FIG. 1 is a schematic cross-sectional view of a novel biopsy needle according to the present utility model.

Fig. 2 is a schematic cross-sectional view of the present utility model with the piston rod in the negative pressure position.

Fig. 3 is a schematic perspective view of the present utility model.

Fig. 4 is a schematic exploded view of the present utility model.

Fig. 5 and 6 are schematic views of the structure of the present utility model with a spring when the piston rod is in different positions.

Fig. 7 is an enlarged schematic view of the structure at a in fig. 6.

Fig. 8 is a schematic view of a partial structure of the present utility model when the axis of the limit lever is arranged on the different surface from the axis of the through hole.

Fig. 9 is a partially enlarged schematic view of the outer needle and the inner needle.

In the figure:

a needle cylinder 1; a nipple seat 11; a spiral groove 12; a bar-shaped groove 13; a first outer wall section 14; a second outer wall section 15;

an outer needle 2; a needle holder 21; a connection base 22; a tip 23;

a piston rod 3; a rubber sleeve 31; a through hole 32; a clip strip 33; limit teeth 331; a stopper 34; a compression spring 35;

an inner needle 4; a fixing base 41; diamond-shaped surface 42;

a lock switch 5; a connecting bar 51; a latch 52; a rotating seat 53; a rotating lever 54; a hook 541; a return spring 55; and a limiting aperture 56.

Detailed Description

In order to further explain the technical scheme of the utility model, the utility model is explained in detail by specific examples.

As shown in fig. 1 to 9, the novel biopsy needle comprises a needle cylinder 1, an outer needle 2, a piston rod 3 and an inner needle 4, wherein the outer needle 2 is fixedly connected to the front part of the needle cylinder 1, the front part of the piston rod 3 is arranged in the needle cylinder 1 and can slide along the length direction of the needle cylinder 1, and the front part of the piston rod 3 is provided with a rubber sleeve 31 which is in sealing connection with the inner wall of the needle cylinder 1; a through hole 32 arranged along the length direction is arranged in the piston rod 3, the through hole 32 extends from the head of the piston rod 3 to the tail of the piston rod 3, and the inner needle 4 is arranged in the through hole 32 in a penetrating manner; the tip of the inner needle 4 can be accommodated in the inner cavity of the outer needle 2, and the rubber sleeve 31 is in propping sealing on the outer side wall of the inner needle 4; the tail of the inner needle 4 is fixedly connected with a fixing seat 41, and the fixing seat 41 is detachably and fixedly connected with the through hole 32 at the tail of the piston rod through the opening of the through hole 32.

Thus, the novel biopsy needle according to the present utility model ejects the extracted tissue in the outer needle 2 by pushing the piston rod 3 and the inner needle 4 together forward after the biopsy needle is taken out from the patient; because the inner needle 4 is detachably connected with the piston rod 3, the inner needle 4 can be completely separated from the piston rod 3 or the inner needle 4 can be moved backwards until the inner needle 4 is separated from the outer needle 2 (namely, the inner needle 4 is still partially connected with the piston rod 3, but when the piston rod 3 is used for sucking eluent in a reciprocating manner, the front part of the inner needle 4 is not positioned in the outer needle 2), so that when the needle tip of the outer needle 2 is positioned in the eluent, the piston rod 3 can smoothly suck the eluent, and therefore, the inner wall of the outer needle 2 or cells positioned in the needle cylinder 1 can be transferred into the eluent, and the subsequent cytological examination is convenient.

The fixing seat 41 plays a role in firmly connecting the inner needle 4 with the fixing seat 41, and simultaneously, the operator is convenient to drive the inner needle 4 backwards. The fixing seat 41 can also be in sealing connection with the through hole 32, so that the tightness in the syringe 1 is further ensured. The fixing seat 41 may be detachably connected to the through hole by a threaded connection or a clamping connection. The rubber sleeve 31 is in propping sealing on the outer side wall of the inner needle 4, so that when the inner needle 4 passes through the rubber sleeve 31, the rubber sleeve 31 can seal with the inner needle 4, and the sealing effect of the inner cavity of the needle cylinder 1 is ensured; after the inner needle 4 is separated from the rubber sleeve 31, the rubber sleeve 31 can be closed under the action of self elasticity due to the small diameter of the inner needle 4, and the sealing effect is ensured. And when the inner needle 4 is withdrawn, the rubber sleeve 31 which is abutted against and sealed on the outer wall of the inner needle 4 can scrape off tissue cells attached on the outer wall of the inner needle 4 to a certain extent, so that the sample collection of cytological examination is facilitated.

Preferably, the needle seat 21 of the outer needle 2 is detachably and fixedly connected with the front part of the needle cylinder 1. Thus, the needle cylinder 1 can be suitable for the outer needles 2 with different specifications, and is convenient to replace. Furthermore, the outer wall of the needle seat 21 of the outer needle 2 is provided with annular connecting seats 22 which are uniformly arranged at intervals, the front part of the needle cylinder 1 is provided with spiral grooves 12 which are the same as the connecting seats 22 in number, and after the needle seat 21 is connected with the nipple seat 11 of the needle cylinder 1, the connecting seats 22 are connected in the spiral grooves 12. Furthermore, the inner wall of the outer needle 2 is provided with a spiral strip (not shown in the figure), so that the tissue can be conveniently and firmly grasped. As shown in fig. 9, the three tips 23 of the outer needle 2 are easy to break after being taken out of the tissue, and the tip of the inner needle 4 has a plurality of diamond surfaces 42, so that the skin breaking and needle insertion are facilitated.

Preferably, the piston rod 3 is provided with a clamping strip 33, the clamping strip 33 is provided with a limiting tooth 331, and when negative pressure is formed in the syringe 1, the limiting tooth 331 abuts against the syringe 1 to limit rebound of the piston rod 3. After the outer needle 2 of the puncture needle is punctured in place, the doctor drives the piston rod 3 to move backwards, so that negative pressure is formed inside the needle cylinder 1, and the limiting teeth 331 are propped against the rear end of the needle cylinder 1, so that the negative pressure is still maintained after the hand is loosened. The clamping strip 33 adopts a fold line design, so that the bending part of the clamping strip 33 can be propped against the piston rod 3, the limiting teeth 331 have a trend along the radial direction outwards, and the limiting teeth 331 can be conveniently propped against the needle cylinder 1.

Preferably, a blocking member (not shown) is further provided at the rear of the piston rod 3 to block the through hole 32 after the inner needle 4 is removed. If the inner needle 4 is completely withdrawn, the sealing performance of the inside of the syringe 1 can be ensured by plugging the through hole 32 at the tail of the piston rod 3 by using the plugging piece, so as to complete the operation of sucking the eluent.

As shown in fig. 5 to 7, preferably, a spring is sleeved on the outer side wall of the piston rod 3, a limit part 34 is further provided on the piston rod 3, a bar-shaped groove 13 is provided on the needle cylinder 1, the length direction of the bar-shaped groove 13 is parallel to the moving direction of the piston rod 3, and the limit part 34 is slidably provided in the bar-shaped groove 13 along with the movement of the piston rod 3; a locking switch 5 is also arranged between the needle cylinder 1 and the piston rod 3; the piston rod 3 has an initial position and a negative pressure position, and when the piston rod 3 is at the initial position, the piston rod 3 is fixedly connected with the needle cylinder 1 through the locking switch 5; after the trigger of the lock switch 5 is released, the spring drives the piston rod 3 to move to the negative pressure position from the initial position to the rear side so as to form negative pressure in the syringe 1.

The outside of the piston rod 3 is provided with a spring and a limiting part 34, and after the outer needle 2 of the puncture needle is punctured in place, a doctor drives the piston rod 3 to move backwards by unlocking the locking switch 5, so that negative pressure is formed inside the needle cylinder 1. Thus, the operation can be realized through the action of the spring without hands of doctors. When the eluent is sucked back and forth later, the stroke of the doctor driving the piston rod 3 to move is smaller than the stroke of the piston rod 3 from the initial position to the negative pressure position, so that the piston rod 3 is not locked again. So the doctor can press the afterbody of piston rod 3 by one hand, loosens the back, and piston rod 3 kick-backs under the spring effect, so reciprocating, and the operation is very convenient.

Preferably, the syringe 1 comprises a first outer wall section 14 and a second outer wall section 15, the second outer wall section 15 is disposed on one side of the first outer wall section 14 away from the outer needle 2, the rubber sleeve 31 of the piston rod 3 is slidably connected to the first outer wall section 14, and the inner diameter of the second outer wall section 15 is larger than the outer diameter of the first outer wall section 14.

As shown in fig. 5 to 8, the spring is a compression spring 35, the compression spring 35 is accommodated in the second outer wall section 15, and both ends of the compression spring 35 respectively abut against the piston rod 3. By providing the second outer wall section 15 with an inner diameter larger than the first outer wall section 14, the spring can be more conveniently installed. The spring can be a compression spring 35 or a tension spring, and the mounting structures of the piston rod 3 and the spring on the needle cylinder 1 are designed according to different mounting modes of the spring.

Preferably, the locking switch 5 includes a connecting strip 51 disposed on the piston rod 3, and a clamping block 52 is formed on the connecting strip 51; the locking switch 5 further comprises a triggering mechanism, and when the piston rod 3 is at the initial position, the piston rod 3 is connected with the side wall of the needle cylinder 1 through a clamping block 52; the trigger mechanism is provided on the outer wall of the cylinder 1, and the latch 52 can be disengaged from the cylinder 1 by pressing the trigger mechanism.

The structure of the locking switch 5 of the present utility model is not limited to the above-mentioned structure, and other structures capable of realizing locking and releasing of two members sleeved with each other under the action of a spring can be applied to the present utility model on the premise of ensuring the smoothness of the strength. The triggering mechanism comprises a rotating seat 53 and a rotating rod 54, a limiting hole 56 is formed in the outer wall of the needle cylinder 1, the middle of the rotating rod 54 is rotatably connected to the rotating seat 53, a hook 541 is arranged at the front end of the rotating rod 54, the hook 541 is located in the limiting hole 56 and can hook the clamping block 52, and a reset spring 55 is arranged between the rear end of the rotating rod 54 and the outer wall of the needle cylinder 1.

Preferably, the limiting part 34 is a limiting rod fixedly arranged on the piston rod 3, the strip-shaped groove 13 is a strip-shaped through groove formed on the needle cylinder 1, and the limiting part 34 is arranged in the strip-shaped groove 13 in a penetrating manner. When the limiting rod is designed, the position of the through hole 32 in the inside needs to be avoided, for example, the limiting rod is arranged on one side or two sides of the piston rod 3, and the position of the through hole 32 is not provided with the limiting rod. As shown in fig. 8, the axis of the stopper rod is disposed on the opposite side of the axis of the through hole 32, so that the stopper rod does not interfere with the through hole 32 even if the stopper rod is disposed so as to penetrate.

Compared with the prior art, the utility model has the advantages that the inner needle 4 which can be detached from the piston rod 3 is arranged, so that the inner needle 4 is prevented from influencing the smooth movement of the piston rod 3 in the outer needle 2 when the eluent is sucked back and forth, the histological sample can be obtained, and the cytological sample can be conveniently obtained through elution.

The above examples and drawings are not intended to limit the form or form of the present utility model, and any suitable variations or modifications thereof by those skilled in the art should be construed as not departing from the scope of the present utility model.

Claims

1. The novel biopsy needle is characterized by comprising a needle cylinder, an outer needle, a piston rod and an inner needle, wherein the outer needle is fixedly connected to the front part of the needle cylinder, the front part of the piston rod is arranged inside the needle cylinder and can slide along the length direction of the needle cylinder, and the front part of the piston rod is provided with a rubber sleeve in sealing connection with the inner wall of the needle cylinder; the inner needle is arranged in the through hole in a penetrating way; the tip of the inner needle can be accommodated in the inner cavity of the outer needle, and the rubber sleeve can be propped against and sealed on the outer side wall of the inner needle; the inner needle tail part is fixedly connected with a fixing seat, and the fixing seat is detachably and fixedly connected with a through hole opening of the through hole at the tail part of the piston rod.

2. A novel biopsy needle as defined in claim 1, wherein the hub of said outer needle is removably fixedly connected to the front of said barrel.

3. The novel biopsy needle of claim 1, wherein the plunger rod is provided with a locking strip, the locking strip is provided with a limiting tooth, and the limiting tooth is abutted against the plunger rod to limit rebound of the plunger rod when negative pressure is formed in the plunger rod.

4. The novel biopsy needle of claim 1, wherein a spring is sleeved on the lateral wall of the outer side of the piston rod, a limiting part is further arranged on the piston rod, a strip-shaped groove is arranged on the needle cylinder, the length direction of the strip-shaped groove is parallel to the moving direction of the piston rod, and the limiting part is slidably arranged in the strip-shaped groove along with the movement of the piston rod;

5. The novel biopsy needle of claim 4, wherein the barrel comprises a first outer wall section and a second outer wall section, wherein the second outer wall section is disposed on a side of the first outer wall section away from the outer needle, wherein the sleeve of the plunger rod is slidably coupled to the first outer wall section, and wherein the second outer wall section has an inner diameter greater than an outer diameter of the first outer wall section.

6. A novel biopsy needle according to claim 5, wherein the spring is a compression spring, the compression spring being accommodated in the second outer wall section, both ends of the compression spring being in abutment with the piston rod, respectively.

7. The novel biopsy needle of claim 4, wherein the limit part is a limit rod fixedly arranged on the piston rod, the strip-shaped groove is a strip-shaped through groove formed on the needle cylinder, and the limit part is arranged in the strip-shaped groove in a penetrating way.