CN114947984A - Safe type biopsy device - Google Patents
Safe type biopsy device Download PDFInfo
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- CN114947984A CN114947984A CN202210553504.0A CN202210553504A CN114947984A CN 114947984 A CN114947984 A CN 114947984A CN 202210553504 A CN202210553504 A CN 202210553504A CN 114947984 A CN114947984 A CN 114947984A
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- 238000001574 biopsy Methods 0.000 title claims abstract description 20
- 238000013016 damping Methods 0.000 claims abstract description 76
- 238000005070 sampling Methods 0.000 claims abstract description 24
- 238000007789 sealing Methods 0.000 claims abstract description 16
- 230000000903 blocking effect Effects 0.000 claims description 55
- 238000000034 method Methods 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 239000010720 hydraulic oil Substances 0.000 description 11
- 201000010099 disease Diseases 0.000 description 3
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 208000017169 kidney disease Diseases 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000036732 histological change Effects 0.000 description 1
- 210000003734 kidney Anatomy 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008506 pathogenesis Effects 0.000 description 1
- 230000007170 pathology Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B10/00—Other methods or instruments for diagnosis, e.g. instruments for taking a cell sample, for biopsy, for vaccination diagnosis; Sex determination; Ovulation-period determination; Throat striking implements
- A61B10/02—Instruments for taking cell samples or for biopsy
- A61B10/0233—Pointed or sharp biopsy instruments
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B10/00—Other methods or instruments for diagnosis, e.g. instruments for taking a cell sample, for biopsy, for vaccination diagnosis; Sex determination; Ovulation-period determination; Throat striking implements
- A61B10/02—Instruments for taking cell samples or for biopsy
- A61B10/0233—Pointed or sharp biopsy instruments
- A61B10/0283—Pointed or sharp biopsy instruments with vacuum aspiration, e.g. caused by retractable plunger or by connected syringe
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Medical Informatics (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Pathology (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Actuator (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention relates to the field of transmission devices, in particular to a safe type biopsy sampling device. The utility model provides a safe type biopsy device, includes the support, still includes hydraulic cylinder, piston shaft, sampling component and damping piston. The hydraulic cylinder is fixed on the bracket. The lower end of the hydraulic cylinder extends downwards to form a one-way ratchet cylinder. The piston shaft is inserted on the hydraulic cylinder in a sliding way in the vertical direction, and the lower end of the piston shaft extends downwards to form the hydraulic cylinder. Two shaft shoulders are arranged on the piston shaft at intervals. The sampling assembly includes a barrel and a needle. The piston shaft extends into the syringe and is in sealing contact with the inner wall of the syringe, and the bottom of the piston shaft is in contact with the bottom of the syringe in an initial state. The syringe needle is vertical to be fixed at the cylinder lower extreme, and the damping piston suit is on the piston shaft, and slides from top to bottom between two shoulders for when the piston shaft pushes down, prevent that the piston shaft from upwards sliding, when the piston shaft upwards pulls out, prevent that the piston shaft from driving the cylinder and slide downwards, and then increase the stability of sampling in-process.
Description
Technical Field
The invention relates to the field of transmission devices, in particular to a safe type biopsy sampling device.
Background
Due to the wide variety of kidney diseases and the complex etiology and pathogenesis, the clinical manifestations of many kidney diseases are not completely consistent with the histological changes of the kidney. In order to determine the pathology of a disease and further determine the specific disease type of a patient, a living body sampling device is required to perform sampling detection on the disease focus.
Most of the existing biopsy sampling devices adopt a full-automatic biopsy gun for sampling, and when the existing biopsy sampling devices perform puncture sampling, the stability of the devices is poor when a puncture needle is upwards extracted, so that secondary damage can be caused to a patient.
Disclosure of Invention
The invention provides a safe living body sampling device, which aims to solve the problem that the existing living body sampling device is poor in stability.
The safety type biopsy device adopts the following technical scheme:
a safe living body sampling device comprises a bracket, a hydraulic cylinder, a piston shaft, a sampling assembly and a damping piston; the hydraulic cylinder is vertically arranged and fixed on the bracket; the lower end of the hydraulic cylinder extends downwards to form a unidirectional ratchet cylinder; the piston shaft is inserted on the hydraulic cylinder in a sliding way in the vertical direction, and the lower end of the piston shaft extends downwards to form the hydraulic cylinder; two shaft shoulders are arranged on the piston shaft at intervals; the sampling assembly comprises a needle cylinder and a needle head; the needle cylinder can be arranged in the unidirectional ratchet cylinder in a downward sliding way; the piston shaft extends into the needle cylinder and is in sealing contact with the inner wall of the needle cylinder, and the bottom of the piston shaft is in contact with the bottom of the needle cylinder in an initial state; the needle head is vertically fixed at the lower end of the needle cylinder; the damping piston is sleeved on the piston shaft and slides up and down between the two shaft shoulders, so that the piston shaft is prevented from sliding upwards when the piston shaft pushes downwards, and the needle cylinder is prevented from sliding downwards when the piston shaft is pulled upwards.
Further, the damping piston comprises a piston cylinder, a limiting ring, a plurality of blocking pins and an end cover; the shaft shoulders are provided with through holes extending in the vertical direction, and the limiting rings are sleeved on the piston shaft in a sealing manner and slide up and down between the two shaft shoulders; the piston cylinder is sealed and fixedly sleeved on the limiting ring, and is in sealing contact with the hydraulic cylinder; the end cover is annular, and vertical through holes are uniformly distributed in the circumferential direction of the end cover and comprise an upper end cover and a lower end cover; the upper cover body is hermetically arranged at an opening at the upper end of the piston cylinder, an annular mounting groove is defined in the upper cover body, and the through hole penetrates through the mounting groove; a damping ring is arranged in the mounting groove, a plurality of damping holes are uniformly distributed on the damping ring in the circumferential direction, and each damping hole is coaxial with one through hole; a plurality of damping springs are uniformly distributed on the lower surface of the damping ring in the circumferential direction, so that the damping ring is connected with the upper surface of the mounting groove; the lower cover body and the upper cover body have the same structure and are symmetrically arranged at the lower end opening of the piston cylinder; the plurality of blocking pins are respectively a plurality of upper blocking pins and a plurality of lower blocking pins; the upper stop pin is inserted into the inner wall of the piston cylinder in a sliding manner along the radial direction, is positioned above the limiting ring and is used for sliding inwards to be contacted with the upper surface of the shaft shoulder when sliding upwards to the upper part of the shaft shoulder; an elastic component is arranged between the upper stop pin and the piston cylinder; a plurality of upper blocking pins are uniformly distributed along the axial direction of the piston shaft; the lower blocking pin and the lower blocking pin have the same structure and are symmetrically arranged.
Further, the upper end of the cross section of the mounting groove of the upper end cover is gradually widened from the upper end to the lower end; the cross section upper end of the damping ring of upper end cover to the lower extreme widen gradually, and the upper surface of damping ring and the upper surface sealing contact of mounting groove.
Furthermore, an upper ring groove and a lower ring groove are arranged on the inner wall of the piston cylinder; the upper ring groove is positioned above the limiting ring, the upper blocking pin is arranged in the upper ring groove, and the elastic assembly is arranged between the upper blocking pin and the upper ring groove; the lower ring groove is positioned below the limiting ring, the lower blocking pin is arranged in the lower ring groove, and the elastic component is arranged between the lower blocking pin and the lower ring groove.
Further, the elastic assembly includes a plurality of blocking springs; each blocking spring is sleeved on one blocking pin, so that the blocking spring contracts to accumulate force when the upper blocking pin and the lower blocking pin move inwards.
Furthermore, a piston is arranged in the needle cylinder, the piston can be arranged in the needle cylinder in a vertically sliding mode, and the piston is arranged at the lower end of the piston shaft.
Furthermore, a plurality of ratchet teeth with upward inclined surfaces are uniformly arranged in the unidirectional ratchet barrel along the vertical direction.
The invention has the beneficial effects that: the safety type biopsy device provided by the invention is provided with the hydraulic cylinder, the piston shaft, the sampling assembly and the damping piston, the unidirectional ratchet cylinder extends out of the lower end of the hydraulic cylinder, the piston pushes the needle cylinder driving the sampling assembly to slide downwards in the axial direction, the needle cylinder can only slide downwards under the action of the unidirectional ratchet cylinder, and the damping piston can prevent the piston shaft from pressing downwards to cause the needle cylinder to slide upwards under the influence of pressure intensity. When the piston shaft upwards pulls out, the damping piston prevents that the piston shaft from the drive of negative pressure in the cylinder to slide downwards, and the negative pressure that cylinder and piston shaft lower extreme produced simultaneously enables the sample by easier extraction, and then increases the stability in the sample process.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural view of an embodiment of a safety biopsy device according to the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at I;
FIG. 3 is an enlarged view of a portion of FIG. 2 at III;
FIG. 4 is an enlarged view of a portion of FIG. 2 at IV;
FIG. 5 is an enlarged view of a portion of FIG. 1 at II;
FIG. 6 is a schematic view of a damping ring of an embodiment of a safety biopsy device of the present invention;
in the figure: 1. a base; 2. a support; 3. a piston shaft; 4. a hydraulic cylinder; 5. a damping piston; 6. a unidirectional ratchet barrel; 7. a needle cylinder; 8. a piston; 9. a needle head; 10. a piston cylinder; 11. a shaft shoulder; 12. a through hole; 13. a damping ring; 14. an end cap; 15. a damping hole; 16. a blocking pin; 17. a seal ring; 18. a limit ring.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 6, the safety biopsy device of the present invention includes a frame 2, a base 1 is disposed at a lower end of the frame 2, and the base 1 is used to adjust a position of the frame 2, so that the frame 2 can be adjusted to different angles. And further comprises a hydraulic cylinder 4, a piston shaft 3, a sampling assembly and a damping piston 5. The hydraulic cylinder 4 is vertically arranged and fixed on the support 2, the lower end of the hydraulic cylinder 4 extends downwards to form a one-way ratchet cylinder 6, and the hydraulic cylinder 4 is filled with hydraulic oil. The piston shaft 3 is slidably inserted into the hydraulic cylinder 4 in the vertical direction, the lower end of the piston shaft extends downwards to form the hydraulic cylinder 4, the upper end of the piston shaft extends upwards to form the hydraulic cylinder 4, and the handle is arranged at the upper end of the piston shaft 3 and is convenient to pull and pull the piston shaft 3. The piston shaft 3 and the hydraulic cylinder 4 form a hydraulic cavity, and the hydraulic pressure is sealed. Two shoulders 11 are arranged on the piston shaft 3 at intervals, and the two shoulders 11 keep a certain distance.
The sampling assembly comprises a barrel 7 and a needle 9. The syringe 7 is slidably installed in the unidirectional ratchet barrel 6, and specifically, the syringe 7 and the unidirectional ratchet barrel 6 are matched to make the syringe 7 only slide downwards. The piston shaft 3 extends into the needle cylinder 7 and is in sealing contact with the inner wall of the needle cylinder 7, and the bottom of the piston shaft 3 is in contact with the bottom of the needle cylinder 7 in an initial state so as to drive the needle cylinder 7 to slide downwards when the piston shaft 3 is pressed downwards, and when the piston shaft 3 is pulled upwards, the piston shaft 3 slides upwards relative to the needle cylinder 7, so that negative pressure is generated between the piston shaft 3 and the needle cylinder 7. The needle 9 is vertically fixed at the lower end of the needle cylinder 7, the needle cylinder 7 is used for inserting a part needing sampling, and the negative pressure between the piston shaft 3 and the needle cylinder 7 sucks out a sample. A piston 8 is arranged in the needle cylinder 7, the piston 8 can be installed in the needle cylinder 7 in a vertical sliding mode, and the piston 8 is installed at the lower end of the piston shaft 3. Damping piston 5 sets up in the hydraulic pressure intracavity, damping piston 5 suit is on piston shaft 3, and slide from top to bottom between two shoulders 11, be used for when piston shaft 3 promotes downwards, prevent piston shaft 3 upwards sliding, avoid when the needle is for reacing the sample area, make piston shaft 3 rebound because of the reason of pressure, when piston shaft 3 upwards pulls out, prevent that piston shaft 3 from driving cylinder 7 and slide downwards, avoid when outwards extracting the sample, negative pressure between piston shaft 3 and the cylinder 7 makes piston shaft 3 pulling piston shaft 3 slide downwards, and then make the sample extraction failure.
In this embodiment, as shown in fig. 1 to 6, the damping piston 5 includes a piston cylinder 10, a retainer ring 18, a plurality of blocking pins 16, and an end cap 14. Through holes 12 extending in the vertical direction are formed in the shaft shoulder 11, and the through holes 12 are circumferentially and uniformly distributed on the shaft shoulder 11. The limiting ring 18 is hermetically sleeved on the piston shaft 3 and slides up and down between the two shaft shoulders 11. The piston cylinder 10 is of an annular cylinder body structure, the piston cylinder is hermetically and fixedly sleeved on the limiting ring 18, the piston cylinder 10 is in sealing contact with the hydraulic cylinder, the upper end and the lower end of the piston cylinder 10 respectively extend out of the upper end and the lower end of the limiting ring 18, and the through hole 12 in the shaft shoulder 11 is used for balancing the pressure between the shaft shoulder 11 and the limiting ring 18. The end cover 14 is annular, and the vertical through holes that run through are evenly distributed on the end cover 14 in the circumferential direction, and the end cover comprises an upper end cover and a lower end cover. The upper cover body is hermetically arranged at the opening at the upper end of the piston cylinder 10, an annular mounting groove is defined inside the upper cover body, and the through hole penetrates through the mounting groove. Be equipped with damping ring 13 in the mounting groove, the last circumference equipartition of damping ring 13 has a plurality of damping holes 15, and every damping hole 15 is coaxial with a through hole to when making damping ring 13 and mounting groove upper end sealing contact, hydraulic oil can be followed the hydraulic pressure chamber and passed through damping hole 15 and get into in the piston cylinder 10. The lower surface circumference equipartition of damping ring 13 has a plurality of damping springs, and the damping spring upper end is connected with damping ring 13, and the lower extreme is connected with the mounting groove to the upper surface that makes damping ring 13 and mounting groove meets, when piston cylinder 10 upwards slided, damping spring is compressed, and gapped between damping ring 13 and the mounting groove upper end, the speed that hydraulic oil got into in the piston cylinder 10 becomes fast. The lower cover body and the upper cover body are identical in structure and symmetrically arranged at the lower end opening of the piston cylinder 10, so that when the piston 8 slides downwards, a gap is reserved between the damping ring 13 in the lower cover body and the lower end of the corresponding mounting groove, the speed of hydraulic oil entering the piston cylinder 10 from the lower part is increased, and the pressure in the piston cylinder 10 is increased. The plurality of stopper pins 16 are a plurality of upper stopper pins and a plurality of lower stopper pins, respectively. The upper stop pin is slidably inserted into the inner wall of the piston cylinder 10 along the radial direction and is positioned above the limiting ring 18, and the distance between the upper stop pin and the limiting ring 18 is equal to the height of the shaft shoulder 11, so that when the pressure in the piston cylinder 10 is increased and is positioned above the shaft shoulder 11 at the upper end, the upper stop pin slides inwards and extends out of the piston cylinder 10 and is in contact with the upper surface of the shaft shoulder 11. An elastic component is arranged between the upper blocking pin and the piston cylinder 10, and a plurality of upper blocking pins are uniformly distributed along the axial direction of the piston shaft 3. The lower blocking pin and the upper blocking pin are identical in structure and are symmetrically arranged relative to a horizontal center line of the piston cylinder 10, and the lower blocking pin is used for sliding inwards and extending out of the piston cylinder 10 when the pressure in the piston cylinder 10 is increased and is located below the shaft shoulder 11 at the lower end, and is in contact with the lower surface of the shaft shoulder 11 at the lower end.
In this embodiment, as shown in fig. 2 to 6, the cross-sectional upper end of the mounting groove of the upper end cover gradually widens toward the lower end. The cross section upper end of the damping ring 13 of upper end cover widens gradually to the lower extreme, and the upper surface of damping ring 13 and the upper surface sealing contact of mounting groove to make the sealed effect reinforcing between damping ring 13 and the mounting groove upper end, and then when making to have the clearance between the upper end of damping ring 13 and mounting groove, the inclined plane clearance between damping ring 13 and the mounting groove enables the hydraulic oil velocity of flow and accelerates. The lower end cover and the upper end cover have the same structure.
In this embodiment, as shown in fig. 2 to 5, an upper ring groove and a lower ring groove are provided on the inner wall of the piston cylinder 10. Go up the annular and be located the top of spacing ring, go up to block the round pin and install in last annular, the length that goes up to block the round pin is the same with the groove depth of going up the annular, and elastic component sets up and blocks between round pin and the last annular between, and the initial condition is gone up and is blocked the inner surface that round pin outer end and piston cylinder and flush. The lower ring groove is positioned below the limiting ring 18, the lower stop pin is arranged in the lower ring groove, the length of the lower stop pin is the same as the groove depth of the lower ring groove, and the elastic component is arranged between the lower stop pin and the lower ring groove. The elastic assembly comprises a plurality of blocking springs, and each blocking spring is sleeved on one blocking pin respectively so as to contract and accumulate force when the upper blocking pin and the lower blocking pin move inwards. The upper blocking pin comprises a cover cap and a blocking rod. The stop rod is inserted in the upper annular groove in a sliding mode along the radial direction, the stop spring is sleeved on the stop rod, one end of the stop spring is fixedly connected with the cap, the other end of the stop spring is fixedly connected with the inner end of the annular groove, specifically, a plurality of sealing rings 17 are uniformly distributed in the sliding groove, and the stop rod is inserted on the sealing rings 17 in a sliding mode so as to guarantee the insertion contact and the sealing performance of the stop pin 16.
In this embodiment, as shown in fig. 5, a plurality of ratchet teeth facing upward slantwise are uniformly arranged in the unidirectional ratchet barrel 6 along the vertical direction. The opening at the upper end of the needle cylinder 7 extends out of the water outlet platform horizontally and outwards, and the horizontal platform of the needle cylinder 7 can slide on the inclined plane of the ratchet.
In operation, the piston shaft 3 is pressed downwards, and when the shaft shoulder 11 at the upper end is contacted with the limiting ring 18, the damping piston 5 is driven to move downwards integrally. The damping rings 13 in the lower end cover of the damping piston 5 are separated from the lower end face of the mounting groove, the corresponding damping springs are compressed, hydraulic oil flows into the piston cylinder 10 from the gap between the damping rings 13 in the lower end cover and the corresponding mounting groove and the damping holes 15, the damping rings 13 and the mounting groove in the upper end cover are in a compression state, and the hydraulic oil only flows out of the piston cylinder 10 from the damping holes 15 on the damping rings 13 in the upper end cover. As the speed of hydraulic oil entering from the lower end in the piston cylinder 10 is larger than the speed of hydraulic oil flowing out from the upper end, the pressure in the damping piston 5 is increased, the blocking pin 16 is pressed out from the piston cylinder 10, the upper blocking pin is in contact with the upper surface of the shaft shoulder 11 at the upper end, and as shown in figures 1 to 4, the upper blocking pin and the limiting ring 18 jointly lock the shaft shoulder 11 at the upper end. Meanwhile, when the piston shaft 3 is pushed downwards, the needle head 9, the needle cylinder 7 and the piston 8 are driven to synchronously move downwards, and the needle head 9 pricks into a human body and is gradually inserted into a position to be sampled under the help of CT.
During the insertion process, when the horizontal platform of the needle cylinder 7 contacts with the inclined surface of the ratchet, the inclined surface of the ratchet exerts an upward reaction force on the needle cylinder 7, but the upper stop pin locks the shoulder 11 at the upper end, so that the piston shaft 3 does not move upward relative to the damping piston 5. Waiting for a period of time to allow the sampled tissue to fully enter the needle cylinder 7, the pressure in the piston cylinder 10 is equal to the pressure in the hydraulic cavity of the hydraulic cylinder 4, and the damping spring on the blocking pin 16 is restored to the initial state, so that the upper blocking pin is retracted outwards and does not block the shaft shoulder 11 at the upper end any more.
The piston shaft 3 is pulled out upwards to extract tissues, the needle cylinder 7 is blocked by the ratchet and cannot move upwards, the damping piston 5 is not moved, and the piston shaft 3 moves upwards relative to the damping piston 5 and is not damped by the damping piston 5. The piston 8 moves upwards relative to the needle cylinder 7, a formed cavity can generate negative pressure to suck sampled tissues until the lower end of the limiting ring 18 is contacted with the shaft shoulder 11 of the lower end, the piston shaft 3 drives the damping piston 5 to move upwards synchronously, at the moment, a gap is formed between the damping ring 13 in the upper end cover and the upper end of the mounting groove, hydraulic oil flows into the piston cylinder 10 from the gap between the damping ring 13 in the upper end cover and the mounting groove and the damping hole 15 of the limiting ring 18, the damping ring 13 in the lower end cover is tightly pressed with the mounting groove, the hydraulic oil only flows out of the piston cylinder 10 from the damping hole 15, the blocking pin 16 slides inwards again and locks the shaft shoulder 11 of the lower end together with the end of the blocking ring 18, the situation that the negative pressure sucks the piston shaft 3 downwards when the pulling force of an operator is small is prevented, the extraction effect is influenced, and the sampling reliability and the sampling safety are further improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. The utility model provides a safe type biopsy device, includes the support, its characterized in that: further comprising:
the hydraulic cylinder is vertically arranged and fixed on the bracket; the lower end of the hydraulic cylinder extends downwards to form a unidirectional ratchet cylinder;
the piston shaft is inserted on the hydraulic cylinder in a sliding manner in the vertical direction, and the lower end of the piston shaft extends downwards out of the hydraulic cylinder; two shaft shoulders are arranged on the piston shaft at intervals;
the sampling assembly comprises a needle cylinder and a needle head; the needle cylinder can be arranged in the unidirectional ratchet cylinder in a downward sliding way; the piston shaft extends into the needle cylinder and is in sealing contact with the inner wall of the needle cylinder, and the bottom of the piston shaft is in contact with the bottom of the needle cylinder in an initial state; the needle head is vertically fixed at the lower end of the needle cylinder;
the damping piston is sleeved on the piston shaft and slides up and down between the two shaft shoulders, and is used for preventing the piston shaft from sliding upwards when the piston shaft pushes downwards and preventing the piston shaft from driving the needle cylinder to slide downwards when the piston shaft pulls out upwards.
2. A safety biopsy device according to claim 1, wherein:
the damping piston comprises a piston cylinder, a limiting ring, a plurality of blocking pins and an end cover; the shaft shoulders are provided with through holes extending in the vertical direction, and the limiting rings are sleeved on the piston shaft in a sealing manner and slide up and down between the two shaft shoulders; the piston cylinder is sealed and fixedly sleeved on the limiting ring, and is in sealing contact with the hydraulic cylinder; the end cover is annular, and vertical through holes are uniformly distributed in the circumferential direction of the end cover and comprise an upper end cover and a lower end cover; the upper cover body is hermetically arranged at an opening at the upper end of the piston cylinder, an annular mounting groove is defined in the upper cover body, and the through hole penetrates through the mounting groove; a damping ring is arranged in the mounting groove, a plurality of damping holes are uniformly distributed on the damping ring in the circumferential direction, and each damping hole is coaxial with one through hole; a plurality of damping springs are uniformly distributed on the lower surface of the damping ring in the circumferential direction, so that the damping ring is connected with the upper surface of the mounting groove; the lower cover body and the upper cover body have the same structure and are symmetrically arranged at the lower end opening of the piston cylinder; the plurality of blocking pins are respectively a plurality of upper blocking pins and a plurality of lower blocking pins; the upper stop pin is inserted into the inner wall of the piston cylinder in a sliding manner along the radial direction, is positioned above the limiting ring and is used for sliding inwards to be contacted with the upper surface of the shaft shoulder when sliding upwards to the upper part of the shaft shoulder; an elastic component is arranged between the upper stop pin and the piston cylinder; a plurality of upper blocking pins are uniformly distributed along the axial direction of the piston shaft; the lower blocking pin and the lower blocking pin have the same structure and are symmetrically arranged.
3. A safety biopsy device according to claim 2, wherein:
the upper end of the cross section of the mounting groove of the upper end cover is gradually widened to the lower end; the cross section upper end of the damping ring of upper end cover to the lower extreme widen gradually, and the upper surface of damping ring and the upper surface sealing contact of mounting groove.
4. A safety biopsy device according to claim 2, wherein:
an upper ring groove and a lower ring groove are arranged on the inner wall of the piston cylinder; the upper ring groove is positioned above the limiting ring, the upper blocking pin is arranged in the upper ring groove, and the elastic assembly is arranged between the upper blocking pin and the upper ring groove; the lower ring groove is positioned below the limiting ring, the lower blocking pin is arranged in the lower ring groove, and the elastic component is arranged between the lower blocking pin and the lower ring groove.
5. A safety biopsy device according to claim 4, wherein:
the elastic assembly comprises a plurality of blocking springs; each blocking spring is sleeved on one blocking pin, so that the blocking spring contracts to accumulate force when the upper blocking pin and the lower blocking pin move inwards.
6. A safety biopsy device according to claim 1, wherein:
the piston is arranged in the needle cylinder, can be arranged in the needle cylinder in a vertical sliding way, and is arranged at the lower end of the piston shaft.
7. A safety biopsy device according to claim 1, wherein:
a plurality of ratchets with upward inclined surfaces are uniformly arranged in the unidirectional ratchet barrel along the vertical direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210553504.0A CN114947984B (en) | 2022-05-20 | 2022-05-20 | Safe living body sampling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210553504.0A CN114947984B (en) | 2022-05-20 | 2022-05-20 | Safe living body sampling device |
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| Publication Number | Publication Date |
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| CN114947984A true CN114947984A (en) | 2022-08-30 |
| CN114947984B CN114947984B (en) | 2024-07-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210553504.0A Active CN114947984B (en) | 2022-05-20 | 2022-05-20 | Safe living body sampling device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2803688C1 (en) * | 2022-11-03 | 2023-09-19 | Сергей Васильевич Трапезов | Two-component atraumatic multifocal biopsy needle |
| CN117883126A (en) * | 2024-03-13 | 2024-04-16 | 德州市红拳医疗器械有限公司 | Puncture sampling device |
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| CN203468649U (en) * | 2013-08-24 | 2014-03-12 | 侯开娟 | Marrow extracting device for departments of hematology |
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| RU2803688C1 (en) * | 2022-11-03 | 2023-09-19 | Сергей Васильевич Трапезов | Two-component atraumatic multifocal biopsy needle |
| CN117883126A (en) * | 2024-03-13 | 2024-04-16 | 德州市红拳医疗器械有限公司 | Puncture sampling device |
| CN117883126B (en) * | 2024-03-13 | 2024-05-10 | 德州市红拳医疗器械有限公司 | Puncture sampling device |
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