CN112336422B

CN112336422B - Puncture kit and puncture device

Info

Publication number: CN112336422B
Application number: CN202011128020.9A
Authority: CN
Inventors: 张晓鹏
Original assignee: Chengdu Shanggu Medical Instrument Co ltd
Current assignee: Chengdu Shanggu Medical Instrument Co ltd
Priority date: 2020-10-20
Filing date: 2020-10-20
Publication date: 2021-11-30
Anticipated expiration: 2040-10-20
Also published as: CN112336422A

Abstract

The invention discloses a puncture kit and a puncture device, wherein the puncture kit comprises: an injection assembly: the injection device is provided with a piston, the piston divides the injection assembly into a liquid storage space and a cavity which are not communicated with each other, and a pressure accumulation part connected with the piston, a needling assembly and a flexible conduction assembly are arranged in the cavity: there is an inlet fitting sealingly connected to the first opening of the injection assembly and an outlet fitting sealingly connected to an end of the lancing assembly distal from the tip such that the flexible conduction assembly directs fluid in the cavity to the lancing assembly. The invention mainly aims to provide a puncture kit, and aims to solve the technical problem of deflection of a puncture assembly in the puncture operation process in the prior art.

Description

Puncture kit and puncture device

Technical Field

The invention relates to the technical field of medical instruments, in particular to a puncture kit and a puncture device.

Background

The continuous epidural anesthesia kit is a device that can automatically detect the disappearance of resistance in the epidural puncture process, thereby identifying the location of the tip: when the puncture needle reaches the epidural space, the injection assembly can automatically release the physiological saline in the injection assembly based on the pre-pressure applied by the elastic part, and the visual effect is intuitive for an operator. However, during the operation, the tip of the needle puncturing assembly may deviate from the predetermined trajectory, which may reduce the puncturing precision and affect the operation result.

Disclosure of Invention

The invention mainly aims to provide a puncture kit, and aims to solve the technical problem that in the prior art, an injection assembly cannot move along a given track due to the self gravity in the puncture operation process.

To achieve the above object, the present invention provides a puncture kit comprising:

an injection assembly: has a piston which divides the injection assembly into a liquid storage space and a cavity which are not communicated with each other, a pressure accumulation part connected with the piston is arranged in the cavity,

a needling assembly, and

the flexible conducting component: there is an inlet fitting sealingly connected to the first opening of the injection assembly and an outlet fitting sealingly connected to an end of the lancing assembly distal from the tip such that the flexible conduction assembly directs fluid in the cavity to the lancing assembly.

Optionally, the length of the flexible conduction assembly is greater than the axial spacing between the injection assembly and the lancing assembly.

Optionally, the flexible conducting assembly comprises a flexible adjusting section, and the flow cross-sectional area of the flexible adjusting section is variable.

Optionally, the flexible adjustment segment comprises a deformation member having an inner diameter at a middle portion thereof that is greater than inner diameters at both ends of the deformation member.

Optionally, the deformation coefficient of the middle portion of the deformation member is greater than the deformation coefficients of the two ends of the deformation member.

Optionally, the flexible adjustment segment is proximate to the outlet fitting.

Optionally, the flexible lead through assembly is transparent.

Optionally, the pressure accumulating means provides a pressure between 16kpa and 22 kpa.

Optionally, the volume of the reservoir space may reach 15 ml when the pressure accumulating means is charged.

Optionally, the invention also provides a puncturing device, characterized by comprising a puncturing kit according to any of the preceding claims.

According to the technical scheme, in the implementation process, the inlet connector of the flexible conduction assembly is in sealing connection with the first opening of the injection assembly, and the outlet connector of the flexible conduction assembly is in sealing connection with one end, far away from the tip, of the acupuncture assembly, so that liquid in a liquid storage space in the injection assembly can flow to the acupuncture assembly through the flexible conduction assembly. Because the flexible subassembly that switches on has pliability and lightweight, puts into the injection subassembly on the horizontal table face, the self gravity of injection subassembly is balanced by the horizontal stand and can not produce the torque to the acupuncture subassembly, consequently can not influence the puncture route of acupuncture subassembly (can not cause the acupuncture subassembly to incline when the puncture because of the gravity of injection subassembly promptly), improves the puncture precision, reduces the operation risk.

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, 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 the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic view of the construction of a piercing kit of the present invention;

FIG. 2 is a schematic view of a preferred flexible feedthrough assembly of the present invention when fully extended;

FIG. 3 is a schematic view of a preferred construction of the injection assembly of the present invention;

FIG. 4 is a schematic view of a preferred construction of a deformation element of the present invention;

fig. 5 is another preferred structural schematic of a deformed component of the present invention.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				100	Injection assembly	100f	Control lever
200	Needling assembly	300a	Flexible adjusting section
				300	Flexible conducting assembly	300b	First section
100a	First opening	300c	Second section
				100b	Liquid storage space	300a-1	Deformation member
100c	Piston	300a-2	First joint
				100d	Hollow cavity	300a-3	Second joint
100e	Pressure accumulating part

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

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.

It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

Epidural and extraperitoneal anesthesia needs to identify the epidural and extraperitoneal cavity to prevent the puncture needle from penetrating into the dura mater or the peritoneum. Taking epidural anesthesia as an example, the puncture tip passes through: the skin, subcutaneous fat, supraspinal, interspinous and ligamentum flavum reach the epidural space. However, if the tip continues to pass through the epidural space, it can penetrate the dura mater, the arachnoid mater, and the subarachnoid space. The subarachnoid space has a central nervous system, and once misjudged, a large amount of anesthetic can be injected into the subarachnoid space by mistake, so that the central nervous system is damaged and even death occurs. Currently, the most commonly used techniques are the resistance reduction techniques: wherein a needle attached to a loss of resistance (LOR) syringe is advanced through the posterior tissue layer while the syringe is forced against the contained fluid and the position of the needle tip in the dura mater or the extraperitoneal cavity is detected by the user's sense of resistance to pushing the syringe. This resistance reduction technique requires a very high degree of experience, on the one hand, it is possible to start the injection of the anesthetic liquid before the outside of the membrane cavity has been reached and, on the other hand, it is possible to pierce the puncture needle into the membrane. Therefore, the invention provides a puncture kit.

Referring to fig. 1-5, a puncture kit includes:

the injection assembly 100: having a piston 100c, the piston 100c dividing the syringe assembly 100 into a liquid storage space 100b and a cavity 100d which are not communicated with each other, a pressure accumulating part 100e connected to the piston 100c being provided in the cavity 100d,

a needling assembly 200, and

the flexible feedthrough assembly 300: there is an inlet fitting sealingly connected to the first opening 100a of the injection assembly 100 and an outlet fitting sealingly connected to an end of the lancing assembly 200 distal from the tip, such that the flexible conduction assembly 200 directs fluid in the cavity 100d to the lancing assembly 200.

In the implementation of the technical solution provided by the present invention, the inlet connector of the flexible conduction assembly 300 is hermetically connected to the first opening 100a of the injection assembly, and the outlet connector of the flexible conduction assembly 300 is hermetically connected to the end of the needle puncture assembly 300 away from the tip, so that the liquid in the liquid storage space 100b of the injection assembly 100 can flow to the needle puncture assembly 200 through the flexible conduction assembly 300. Because the flexible conduction assembly 300 has flexibility and lightness, the injection assembly 100 is placed on a horizontal table surface, the self gravity of the injection assembly 100 is balanced by the horizontal table and cannot generate torque to the acupuncture assembly 200, so that the puncture path of the acupuncture assembly 200 cannot be influenced (namely, the acupuncture assembly 200 cannot be inclined during puncture due to the gravity of the injection assembly 100), the puncture precision is improved, and the operation risk is reduced.

A preferred process of the invention for aspirating physiological saline is: after acupuncture subassembly 200 pierces the human tissue certain distance, switch on the subassembly 300 through injection subassembly 100 to the flexibility and inject normal saline into, guarantee that the flexibility switches on the subassembly 300 and has stored normal saline, after the flexible switch on subassembly 300 has stored normal saline, be connected to acupuncture subassembly 200 with it, injection subassembly 100 inhales normal saline afterwards, switches on subassembly 300 with the flexibility again and is connected.

Another preferred process of the present invention for aspirating physiological saline is: after acupuncture subassembly 200 pierces the human tissue certain distance, injection subassembly 100 leads to the subassembly 300 with the flexibility earlier and is connected, then leads to subassembly 300 through the flexibility and inhales normal saline to injection subassembly 100, and after the normal saline in injection subassembly 100 reached the quantity requirement, lead to the subassembly 300 with the flexibility and be connected to acupuncture subassembly 200, guarantee that the flexibility leads to the storage of subassembly 300 in has normal saline.

In the technical scheme of the invention, when liquid is stored in the liquid storage space 100b, the pressure accumulation part 100e accumulates energy and has the pressure for discharging the liquid out of the injection assembly 100 through the first opening 100 a; in the epidural puncture positioning process, when the tip does not reach the epidural area, the flow resistance of the liquid (the liquid of the present invention is physiological saline without a special example) is higher than the pressure of the pressure accumulating part 100e due to the human tissue, so that the liquid cannot flow out of the injection assembly 100, when the tip reaches the epidural area, the pressure of the pressure accumulating part 100e can cause the liquid to flow out of the injection assembly 100 due to the epidural area being a low pressure area or a negative pressure area, the liquid is guided to the puncture assembly 200 through the flexible conduction assembly 300, at this time, the piston 100c moves to the human body side, and the medical staff can know that the tip has reached the epidural area by observing the movement of the piston or the circulation of the liquid in the flexible conduction assembly 300.

In addition, the technical scheme of the invention at least has the following technical advantages: when the tip reaches the epidural space, the normal saline is automatically released from the injection assembly so as to expand the gap between the ligamentum flavum and the dura mater; after this clearance expansion, thereby on the one hand, the thickness increase in this clearance has certain buffering barrier zone and plays the cushioning effect, effectively prevents that the pointed end from piercing dura mater, guarantees that the operation process is more reliable and safe, and on the other hand makes the anesthetic liquid of follow-up catheterization injection can spread in the normal saline of epidural space, improves anesthesia effect.

Optionally, the length of the flexible conduction assembly 300 is greater than the axial spacing between the injection assembly 100 and the lancing assembly 200; in practice, the injection assembly 100 and the lancing assembly 200 are spatially separated, and the fluid of the injection assembly 100 is directed into the lancing assembly 200 through the flexible conduction assembly 300; referring to fig. 1, the length of the flexible conducting assembly 300 needs to be greater than the axial distance (i.e. the distance in the needle inserting direction) between the two, and at this time, the flexible conducting assembly 300 is in a non-fully extended state during the puncture operation, and the doctor can gradually have a tendency to extend when pushing the needle, so that there is no relative movement between the injection assembly 100 and the platform, that is: the pushing force applied by the physician does not drag the injection assembly 100 into motion.

In actual operation, because normal saline has the effect of expansion to the epidural space, be convenient for subsequent anesthetic liquid can spread in the expansion region for epidural anesthesia is abundant, reduces patient's misery, consequently, normal saline needs certain volume. However, the more the liquid stored in the liquid storage space 100b, the more the pressure can be provided by the pressure accumulating part 100e, when the tip does not reach the epidural area, the liquid may force the physiological saline to flow out due to the excessive pressure of the pressure accumulating part 100e, and the piston moves, so that the medical staff may have the possibility of misjudgment, therefore, the flexible conducting assembly 300 in the present invention includes the flexible adjusting section 300a, and the flow cross-sectional area of the flexible adjusting section 300a is variable. When the required liquid storage amount is larger, the larger the pressure provided by the pressure accumulating part 100e is, the flexible adjusting section 300a with the smaller flow cross section area is selected to be arranged between the first section 300b and the second section 300c of the flexible conduction assembly 300, so that the flow resistance of liquid in the injection assembly can be increased, the possibility that the liquid flows out when the tip does not reach an epidural area is reduced, the possibility of misjudgment is reduced, and the positioning accuracy of the tip is improved; similarly, when the required amount of stored liquid is small, the flexible adjusting section 300a with a slightly larger flow cross-sectional area can be selected to be installed between the first section 300b and the second section 300c of the flexible conducting assembly 300.

In a specific implementation, the flow cross-sectional area of the flexible adjustment section 300a can be changed by an external clamping component, for example, a doctor can change the flow cross-sectional area by squeezing or loosening the outlet end with hands, or the doctor can change the flow cross-sectional area by clamping the flexible adjustment section 300a with a surgical clip; the variable cross-sectional flow area is intended to: on the first hand, when liquid is stored in the liquid storage space 100, the flow cross-sectional area is clamped to 0 by a surgical clip or other medical clips, so that the liquid in the liquid storage space 100 cannot flow out, and then the acupuncture component is connected with the flexible conduction component 300, so that the liquid is prevented from being forced to flow out due to elasticity in the connection process of the outlet end and the acupuncture component, but a small part of the liquid originally in the flexible conduction component 300 is forced to be pressed out, and therefore, a doctor can increase 1ml as required to compensate the part of the forced physiological saline in terms of the dosage of the physiological saline; in a second aspect, the piston starts to move when the tip penetrates the epidural area, and the doctor can control the flow rate and the dosage of the liquid by changing the cross-sectional flow area; in a third aspect, the plunger exhibits a state of being akin to moving when the tip penetrates into a suspected epidural area, and the physician can change the cross-sectional area appropriately to see if the plunger is moving, and if the plunger is not moving or is still in a state of being akin to moving, the tip has not penetrated into the epidural area, and if the plunger is moving, the tip is said to penetrate into the epidural area.

In addition, another implementation process is as follows: the flexible adjusting section 300a can be replaced according to the volume of the liquid storage space, so that the capacity of the liquid storage space can be used for meeting the requirement of the initial anesthesia dosage, the liquid used by the anesthesia injection device can replace the physiological saline with dissolved anesthetic liquid, and the reaching position of the tip is judged through the movement of the piston, so that the judgment and the injection of the physiological saline with dissolved anesthetic liquid are finished at one time, and the requirement of the initial anesthesia is met; however, compared with the use of physiological saline, the method has a slightly higher requirement on the operating skill of the doctor, and requires the doctor to operate the puncture auxiliary assembly provided by the invention reasonably, for example, the doctor slows down the needle insertion speed during the puncture process to prevent the epidural puncture from injecting the physiological saline with the anesthetic into the subarachnoid space by mistake; such as when the tip reaches the epidural space, it is also desirable to control the rate and amount of saline with anesthetic solution injected into the epidural space by controlling the cross-sectional area of the outlet assembly 100 a.

Alternatively, the flexible adjustment segment 300a includes a deformation member 300a-1, and the outer diameter of the deformation member 300a-1 is gradually increased and then gradually decreased in the flow direction of the liquid. In use, a medical practitioner can change the flow resistance of the flexible segments 300 to fluid by changing the cross-sectional area of the deformation member 300 a-1; the outer diameter of the deformation member 300a-1 is gradually increased and then gradually decreased in the flow direction of the liquid; fig. 4 or 5 shows a preferred variant, which is arranged such that: on one hand, the medical joint is used for limiting the position operated by a doctor, the position is arranged at the position with the largest outer diameter, an operation area is prompted to the doctor, and the doctor is prevented from touching the two joints to cause leakage at the joints; whereas, on the other hand, the outer diameter has a tendency to expand and then narrow, the inner diameter of the deforming member 300a-1 has a similar varying arrangement: the inner diameter of the middle part of the deformation part is larger than the inner diameters of the two ends of the deformation part; the inner diameter of the deforming member 300a-1 is gradually increased and then decreased in the flow direction of the liquid, so that the flow cross-sectional area has high variability, and a doctor can assist in determining the suspected region reached by the tip by means of the method. In the specific implementation process, the flexible adjusting section 300a comprises a first joint 300a-2, a deformation part 300a-1 and a second joint 300a-3 which are sequentially communicated; a first connector 300a-2 is in sealed communication with a first segment 300b (the first segment 300b has an inlet connector thereon, the first connector 300a-2 is in sealed communication with an opposite end of the first segment 300b where the inlet connector is disposed), and a second connector 300a-3 is in sealed communication with a second segment 300c (the second segment 300b has an outlet connector thereon, the second connector is in sealed communication with an opposite end of the second segment 300c where the outlet connector is disposed); in one embodiment, the first connector 300a-2 has an inner diameter larger than the inner diameter of the second connector 300a-3, i.e., the fluid resistance is gradually increased in the fluid flow direction, which increases the fluid flow resistance in the injection assembly 100, thereby facilitating the fluid to be better expelled from the barrel due to the greater pressure differential when the tip penetrates the epidural area, so as to better observe the movement of the piston. The placement of the deforming member 300a-1 between two connectors is primarily due to the mechanical connection of the connectors, which facilitates the connection of other components and the manipulation of the deforming member 300a-1 by the physician.

Alternatively, the deformation coefficient of the middle portion of the deforming part 300a-1 is greater than the deformation coefficients of both ends of the deforming part. The deformation coefficient of the deformation member 300a-1 is gradually decreased and then gradually increased in the flow direction of the liquid, and the deformation coefficient is maximized at the maximum outer diameter of the deformation member 300 a-1. Namely: the deformability of the two ends of the deformation component 300a-1 is low, the mechanical connection strength is good, and the situation that the sealing of the deformation component 300a-1 and the two joints fails and liquid leakage occurs due to deformation generated in the manual operation process is avoided; namely: in the manipulation process, the deformable capacity of the middle position of the deformation component 300a-1 is higher, the flow cross section area can be better changed, the flow resistance of the liquid can be increased or reduced through changing the flow cross section area for many times, and the tip can be judged at the suspected position for many times through changing the flow resistance; in addition, in the actual operation process, the liquid slightly flows out of the injection assembly due to the change of the external resistance generated by the human tissues at different positions, in this case, the flow cross-sectional area of the deformation part 300a-1 can be properly reduced, and the flow resistance of the liquid in the injection assembly is increased to prevent the liquid from flowing into other tissues of the human body. In a preferred embodiment, the deformation coefficient of the deformation element can be set by means of a varying wall thickness, namely: referring to fig. 5, the wall thickness is gradually reduced and then gradually increased in the flow direction of the liquid, and defines a minimum wall thickness, a maximum flow cross-sectional area, and a maximum deformation coefficient at the maximum outer diameter; namely: the cross-sectional flow area at the maximum external diameter is most variable, and the greater the variability, the easier the operation. Further, referring to fig. 5, the deformable member 300a-1 may also serve as a small space for storing liquid, and when the tip is inserted into the epidural space, the medical staff may change the amount and speed of the liquid injected into the epidural space by controlling the operation to expand the epidural space for the convenience of the subsequent anesthesia.

Optionally, a flexible regulating segment 300a is provided at an end of the flexible conducting assembly 300 close to the outlet connection, that is: the flexible adjusting section 300a is close to the acupuncture assembly 200, when in operation, a doctor needs to push the acupuncture assembly 200 to move towards the human body through the handle of the acupuncture assembly 200, and the flexible adjusting section 300a is close to the acupuncture assembly 200, which is beneficial to changing the sectional area of the flexible adjusting section 300a in the puncturing process.

Optionally, the flexible conducting assembly 300 is transparent, so as to facilitate observation of the liquid flowing condition during the period, and further facilitate operation to change the flowing cross-sectional area in the deformation component; for example, the first section, the second section and the deforming member are hoses made of medical grade PVC material. Also, optionally, the syringe assembly 100 is transparent to facilitate viewing of the position of the plunger and the volume of fluid stored therein, and in particular to facilitate viewing of the movement of the plunger as the tip reaches the epidural area, and to permit viewing of abnormal movement of the plunger before the tip reaches the epidural area so that the deforming member can be manually controlled to determine the effect of the abnormal movement on the puncture procedure; in practice, the material of the injection assembly 100 may be a transparent material of a common syringe, such as PP.

Alternatively, the pressure accumulating member 100c is a spring; typically, the injection assembly 100 is disposable, as the spring is inexpensive to purchase to reduce costs; moreover, the pressure provided by the spring is sufficient to automatically force the liquid out of the syringe assembly. In practice, the pressure provided by the spring is primarily related to the volume required and the stiffness of the spring, preferably not greater than 58kpa, more preferably from about 3.45kpa to about 39kpa, more preferably from about 13.8kpa to about 39kpa, and even more preferably from about 13.8kpa to about 24.2 kpa. Preferably, through the practical discovery of the inventor of the invention: the pressure provided by the pressure accumulation part is between 16kpa and 22kpa, and the identified epidural space has higher accuracy in the pressure range, so that the surgical risk is reduced; also in this pressure interval, the flow rate of the liquid is easily controlled based on the adjustment of the deforming part 300 a.

Alternatively, the accommodation volume of the liquid storage space 100b may reach 15 ml when the pressure accumulating part 100c is charged. Due to the adjustable deformation component 300a, the flow resistance of the liquid can be improved to resist the pressure provided by the pressure accumulating component, and therefore the maximum volume of the liquid storage space 100b can reach 15 ml (at the moment, the pressure provided by the pressure accumulating component is increased), so that the liquid injected into the epidural space can expand the epidural space, the subsequently injected anesthetic liquid has a larger diffusion space, and the anesthetic effect is improved.

Optionally, the injection assembly 100 has a second opening out of which the operating rod 100f of the injection assembly 100 connected to the piston 100c extends. In the specific implementation process, the operating lever 100f and the piston 100c are coaxially arranged and fixedly connected, and the opening reserves a reserved space for the movement of the operating lever 100 f; when withdrawing the fluid, the doctor needs to store the fluid in the reservoir space against the elastic force of the spring by pulling the operation lever 100 f.

Optionally, the pressure accumulating part 100c is arranged around the axis of the piston 100c to provide uniform pressure; in a specific implementation process, the pressure accumulating parts 100c can be arranged in three groups in total and around the axis of the piston 100c, and the arrangement is preferably uniform, namely the included angle between every two pressure accumulating parts 100c is 120 degrees; or in a specific implementation, the pressure accumulating members 100c are arranged in two groups in total, symmetrically with respect to the axis of the piston 100 c. (ii) a Alternatively, the pressure accumulating member 100c may be one, and the axis of the pressure accumulating member 100c may be coaxial with the axis of the piston.

In the invention, the sealing conduction (connection) can be realized by a luer connection mode, for example, the connectors related to the invention can be luer connectors; the sealed connection can also be realized by means of a threaded connection.

The invention further provides a puncture device, which comprises a puncture kit, the specific structure of the puncture kit refers to the above embodiments, and the puncture kit adopts all technical solutions of all the above embodiments, so that at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved, and the detailed description is omitted. Wherein the needle assembly is a Touhy needle for epidural application or a Veress needle for peritoneal application; the medical staff can select according to the puncture site. The puncture device also comprises a tube. When the doctor judges that the tip reaches the epidural space, the doctor detaches the flexible conduction assembly 300 from the acupuncture assembly 200 and gradually places the catheter into the acupuncture assembly 200 until the catheter is placed into the epidural space.

The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A puncture kit, comprising:

a needling assembly, and

the flexible conducting component: the flexible conducting assembly is used for guiding liquid in the cavity to the acupuncture assembly;

wherein the length of the flexible conduction assembly is greater than the axial spacing between the injection assembly and the lancing assembly;

the flexible conducting assembly comprises a flexible adjusting section, and the flow cross-sectional area of the flexible adjusting section is variable;

the flexible adjusting section comprises a deformation part, and the inner diameter of the middle part of the deformation part is larger than the inner diameters of the two ends of the deformation part;

the deformation coefficient of the middle portion of the deformation member is larger than the deformation coefficients of both ends of the deformation member.

2. The puncture kit of any of claim 1, wherein the flexible adjustment segment is proximate to the outlet fitting.

3. The puncture kit of claim 1, wherein the flexible lead-through assembly is transparent.

4. The puncture kit of claim 1, wherein the pressure provided by the pressure accumulating member is between 16kpa and 22 kpa.

5. The lancing kit of claim 1, wherein the reservoir volume is up to 15 ml when the pressure accumulator is charged.

6. A lancing device comprising a lancing kit according to any one of the preceding claims.