Double-cavity knee joint injection device and injection method

Abstract

The invention belongs to the technical field of medical instruments, and provides a double-cavity knee joint injection device and method, the double-cavity knee joint injection device comprises a needle cylinder body, the needle cylinder body is provided with a main piston cylinder and at least one auxiliary piston cylinder, the inner cavity of the main piston cylinder and the inner cavity of the auxiliary piston cylinder communicate with each other, and the main piston cylinder and the auxiliary piston cylinder are movably connected with plungers; the needle cylinder body is further provided with a needle head end, an injection needle head is arranged at the needle head end, the main piston cylinder is in one-way communication with the injection needle head through a one-way valve, the one-way valve is in one-way communication towards the direction of the injection needle head, and the communication pressure of the one-way valve is adjustable. When an injection needle is inserted into non-target injection tissue, such as muscle, of a patient, the injection resistance of the muscle tissue is large, a one-way valve cannot be conducted in the injection process, so that injection liquid flows into an auxiliary piston cylinder, and a plunger retreats. Therefore, medical staff can conveniently judge whether the injection needle is inserted into a target position or not. And the injection is prevented from being mistakenly injected into other tissues to be wasted.

Description

Technical Field

[0001] The present application belongs to the field of medical device technology, and in particular relates to a double-chamber knee joint injection device and injection method. Background Art

[0002] In existing treatments for some knee joint problems, lubricating fluids can be injected into the knee joint cavity to achieve treatment. However, due to the complex structure of the knee joint, and the lack of experience or inaccurate manipulation by medical personnel, the injection needle can easily be inserted into cartilage or other tissues such as muscle fascia. Since injection fluids are generally expensive, inaccurate injection placement within the joint cavity not only results in financial waste but also compromises treatment effectiveness.

[0003] In some economically developed regions or more advanced hospitals, orthopedic surgeons can use color Doppler ultrasound to visualize the needle's location before performing the procedure. However, this requires the coordination of multiple departments, placing higher demands on both the surgeon and the hospital, and placing greater financial pressure on the patient. The pressure within the knee joint cavity is typically low, making injection easier. However, when the needle penetrates tissues such as cartilage and muscle fascia, the injection pressure is typically higher. However, inexperienced surgeons often cannot sense the difference, which can lead to errors.

[0004] Therefore, the above-mentioned technical defects need to be changed urgently. Summary of the Invention

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of this application is to provide a dual-chamber knee joint injection device and injection method, which aims to facilitate medical staff to judge whether the injection needle is inserted into the target position, avoid the injection liquid from being mistakenly injected into other tissues and wasting the injection liquid, especially for the injection operation of injecting lubricating liquid into the patient's knee joint cavity.

[0006] The technical solution adopted by this application to solve the technical problem is as follows: a dual-chamber knee joint injection device and injection method, comprising:

[0007] The syringe body is provided with a main piston cylinder and at least one auxiliary piston cylinder, the inner cavities of the main piston cylinder and the auxiliary piston cylinder are mutually connected, and the main piston cylinder and the auxiliary piston cylinder are movably connected to the plunger;

[0008] Among them, the syringe body is also provided with a needle end, and the needle end is provided with an injection needle. The main piston cylinder is unidirectionally connected to the injection needle through a one-way valve. The one-way valve is unidirectionally connected in the direction of the injection needle, and the conduction pressure of the one-way valve is adjustable.

[0009] This embodiment is further configured such that the injection needle is detachably connected to the needle end, and the one-way valve includes:

[0010] A mounting base, the mounting base is arranged on the needle end, and a first inner cavity penetrating the main piston cylinder is opened on the mounting base;

[0011] and a valve body, the valve body being screwed onto the mounting base, the injection needle being disposed on the valve body, the valve body defining a second inner cavity in communication with the injection needle, the second inner cavity being in communication with the first inner cavity, a valve inner core being movably connected in the second inner cavity toward the first inner cavity, the valve inner core being disposed with an elastic member, the valve inner core being in contact with an opening of the first inner cavity via the elastic member;

[0012] The valve body is screwed into the mounting base, and the elastic member is compressed, thereby increasing the abutting force between the port of the mounting base and the inner core of the valve.

[0013] This embodiment is further configured such that a rotation mark is provided on at least one of the valve body and the mounting base, and the rotation mark is used to indicate a rotation angle of the valve body.

[0014] This embodiment is further configured such that a visual window is provided on the valve body, and the visual window is used to display the second inner cavity.

[0015] This embodiment is further configured such that a limiting step is provided at an opening of the first inner cavity close to the valve inner core, the limiting step matches the valve inner core, and is used to accommodate the valve inner core.

[0016] This embodiment is further configured such that both the second inner cavity and the first inner cavity extend along the threaded connection direction between the valve body and the mounting base.

[0017] This embodiment is further configured such that a silicone thread is provided on the mounting base, and the mounting base is threadedly connected to the valve body via the silicone thread.

[0018] This embodiment is further configured such that the length of the primary piston cylinder is greater than the length of the secondary piston cylinder.

[0019] This embodiment is further configured such that the primary piston cylinder and the secondary piston cylinder are arranged side by side, and both the primary piston cylinder and the secondary piston cylinder extend in the same direction.

[0020] This embodiment is further configured such that a finger handle is provided at the opening of the main piston cylinder.

[0021] Compared with the prior art, the present application provides a dual-chamber knee joint injection device and injection method. Before using this solution, medical staff first adjust the conduction pressure of the one-way valve according to the injection resistance of the target injection tissue, so that the conduction pressure of the one-way valve plus the injection resistance of the target injection tissue is less than the buffer retraction resistance of the secondary piston cylinder, and then it can be determined that the injection needle is inserted into the correct tissue for injection. When the injection needle is inserted into the patient's non-target injection tissue, such as muscle, due to the large injection resistance of the muscle tissue, the one-way valve cannot be conducted during the injection process, causing the injection liquid to flow into the secondary piston cylinder and the plunger to retract. This makes it convenient for medical staff to judge whether the injection needle is inserted into the target position. It prevents the injection liquid from being mistakenly injected into other tissues and wasting the injection liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 This is a schematic diagram of the overall structure of a dual-chamber knee joint injection device provided in this embodiment;

[0024] Figure 2 This is an exploded schematic diagram of a dual-chamber knee joint injection device provided in this embodiment;

[0025] Figure 3 yes Figure 2 An enlarged schematic diagram of the part marked A;

[0026] Figure 4 This is a cross-sectional view of the mounting base and valve body of a dual-chamber knee joint injection device provided in this embodiment.

[0027] In the figure: 1. Syringe body; 111. Main piston cylinder; 112. Sub-piston cylinder; 113. Plunger; 114. Finger handle; 12. Needle tip; 121. Injection needle; 13. One-way valve; 131. Mounting base; 1311. First inner cavity; 1312. Rotation mark; 1313. Limit step; 1314. Silicone thread; 132. Valve body; 1321. Second inner cavity; 1322. Valve inner core; 1323. Elastic part. DETAILED DESCRIPTION

[0028] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0029] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, "multiple" means two or more.

[0030] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0031] In addition, the technical features involved in the different embodiments of the present invention described above can be combined with each other as long as they do not conflict with each other.

[0032] The present invention provides Figure 1 and Figure 2 As shown, a dual-chamber knee joint injection device is used to inject liquid medicine into patients. In particular, in the treatment of some knee joint diseases, lubricating liquid can be injected into the knee joint cavity to achieve treatment. The main structure of the present invention includes: a syringe body 1, on which a main piston cylinder 111 and at least one auxiliary piston cylinder 112 are provided. The inner cavities of the main piston cylinder 111 and the auxiliary piston cylinder 112 are connected to each other, and the main piston cylinder 111 and the auxiliary piston cylinder 112 are movably connected to the plunger 113. It can be understood that the inner cavities of the main piston cylinder 111 and the auxiliary piston cylinder 112 are both used to accommodate the injection liquid, and the plunger 113 is used to push the liquid in the inner cavity toward the injection needle 121 to achieve the injection effect.

[0033] The syringe body 1 is also provided with a needle end 12, which is equipped with an injection needle 121. The main piston cylinder 111 is in one-way communication with the injection needle 121 via a one-way valve 13. The one-way valve 13 is one-way in the direction of the injection needle 121, and the conduction pressure of the one-way valve 13 is adjustable. That is, the one-way valve 13 allows the injection liquid to flow from the syringe body 1 toward the injection needle, but prevents it from flowing from the injection needle toward the syringe body 1. Furthermore, to maintain one-way communication with the one-way valve 13, the pressure of the injection liquid in the syringe body 1 must be greater than the conduction pressure of the one-way valve 13.

[0034] It should be noted that some knee joint conditions can be treated by injecting lubricating fluid into the knee joint cavity. However, due to the complex structure of the knee joint, and the lack of experience or inaccurate manipulation by medical staff, it is easy to mistakenly insert the injection needle into tissues such as cartilage or muscle fascia. Since injection fluids are generally expensive, inaccurate injection into the joint cavity not only results in financial waste but also compromises treatment effectiveness.

[0035] Before using this solution, medical staff need to adjust the conduction pressure of the one-way valve 13 according to the injection resistance of the target injection tissue, so that the total force value of the conduction pressure of the one-way valve 13 plus the injection resistance of the target injection tissue is less than the buffer retraction resistance of the secondary piston cylinder 112, so that the injection needle 121 can be confirmed to be inserted into the correct tissue for injection.

[0036] In the treatment of patients with knee joint cavity injection of lubricating liquid, since the pressure in the knee joint cavity is usually low, the injection operation is relatively convenient. If the medical staff mistakenly inserts the needle into tissues such as cartilage muscle fascia, the injection pressure of tissues such as cartilage muscle fascia is usually high, and inexperienced medical staff usually cannot feel the difference, so it is easy to inject the injection liquid into non-target injection tissues (such as cartilage muscle fascia), thereby wasting expensive injection liquid. The present application scheme sets a one-way valve 13 between the syringe body 1 and the injection needle 121 to increase the resistance of the plunger 113 on the main piston cylinder 111 when pushing the medicine. By observing whether the plunger 113 on the secondary piston cylinder 112 retreats, it is judged whether the resistance of the injection needle 121 is too large, and it is known whether the injection needle 121 is inserted incorrectly.

[0037] It should be noted that when the injection needle 121 is inserted into a non-target tissue, such as muscle, the one-way valve 13 may not be opened due to the high injection resistance of the muscle tissue, causing the injection liquid to flow into the secondary piston cylinder 112 and the plunger 113 to retract. This facilitates medical personnel to determine whether the injection needle 121 has been inserted into the target location, thus preventing the injection liquid from being mistakenly injected into other tissues and wasting the injection liquid.

[0038] The resistance to the retreat of the plunger 113 in the secondary piston cylinder 112 is determined, and the injection resistance of the target tissue is also known.

[0039] Further, such as Figure 2 、 Figure 3 and Figure 4 As shown, the injection needle 121 is detachably connected to the needle end 12, and the one-way valve 13 includes: a mounting base 131 and a valve body 132. The mounting base 131 is arranged on the needle end 12, and a first inner cavity 1311 is defined on the mounting base 131 and penetrates the main piston cylinder 111; the valve body 132 is screwed onto the mounting base 131, and the injection needle 121 is arranged on the valve body 132, and the valve body 132 defines a second inner cavity 1321 that is mutually conductive with the injection needle 121, and the second inner cavity 1321 is mutually conductive with the first inner cavity 1311, and a valve inner core 1322 is movably connected in the second inner cavity 1321 toward the direction of the first inner cavity 1311, and an elastic member 1323 is provided on the valve inner core 1322, and the valve inner core 1322 abuts against the opening of the first inner cavity 1311 through the elastic member 1323.

[0040] When the valve body 132 is screwed into the mounting base 131 , the elastic member 1323 is compressed, thereby increasing the contact force between the port of the mounting base 131 and the valve inner core 1322 .

[0041] Further, such as Figure 3 As shown, a rotation mark 1312 is provided on at least one of the valve body 132 and the mounting base 131 , and the rotation mark 1312 is used to indicate the rotation angle of the valve body 132 .

[0042] It is understood that the provision of a rotation mark 1312 on at least one of the valve body 132 and the mounting base 131 facilitates medical personnel in identifying the rotation angle of the valve body 132. In some embodiments, the rotation mark 1312 is provided on the mounting base 131 and is arranged around the outer circumference of the mounting base 131. Several conduction pressure values are arranged on the rotation mark 1312. Accordingly, an indicator mark is provided on the outer circumference of the valve body 132. It should be noted that before adjustment, the valve body 132 must first be screwed onto the mounting base 131 to achieve a preliminary seal between the valve body 132 and the mounting base 131. At this point, the valve core 1322 abuts against the mounting base 131 to achieve a sealing function. The conduction pressure value indicated by the indicator mark is the actual conduction pressure value of the valve core 1322.

[0043] It is understandable that in actual design, it is necessary to repeatedly calibrate the conduction pressure value of the valve core 1322. It is also necessary to calibrate the relationship between the rotation angle of the valve body 132 and the conduction pressure of the valve core 1322. This will not be elaborated here.

[0044] Furthermore, a viewing window is provided on the valve body 132, which is used to display the second inner cavity 1321. It is understood that the provision of a viewing window facilitates medical personnel to observe the internal conditions of both. After the valve body 132 and the mounting base 131 are connected, medical personnel can observe the internal conditions of the valve body 132 and the mounting base 131 through the viewing window, specifically whether the valve core 1322 is tightly sealed with the mounting base 131, as well as the compression of the elastic member 1323. This allows medical personnel to more conveniently adjust the conduction pressure of the one-way valve 13. If the valve core 1322 of the one-way valve 13 malfunctions, medical personnel can also immediately see the problem, facilitating troubleshooting.

[0045] Further, such as Figure 3 and Figure 4 As shown, a limiting step 1313 is provided at the opening of the first inner cavity 1311 close to the valve inner core 1322 . The limiting step 1313 matches the valve inner core 1322 and is used to accommodate the valve inner core 1322 .

[0046] In some embodiments, as Figure 4 As shown, the sidewalls of limiting step 1313 are configured as inclined surfaces, giving limiting step 1313 a funnel-like shape. The bottom of limiting step 1313 mates with valve core 1322. The funnel-shaped limiting step 1313, through its inclined surface, guides valve core 1322 into the valve, preventing valve core 1322 from being trapped at the opening of limiting step 1313 due to positional deviation, which could cause sealing failure. Furthermore, valve core 1322 is a disc-shaped core with an outer sidewall that is an outwardly protruding curved surface.

[0047] Further, such as Figure 4As shown, the second inner cavity 1321 and the first inner cavity 1311 both extend along the threaded connection direction between the valve body 132 and the mounting base 131. It will be appreciated that the valve body 132 will displace along the threaded connection direction of the mounting base 131 during rotation. The fact that the second inner cavity 1321 and the first inner cavity 1311 both extend along the threaded connection direction between the valve body 132 and the mounting base 131 allows for smooth movement of the valve core 1322. For example, as the valve body 132 rotates into the mounting base 131, the valve core 1322 abuts against the front end of the mounting base 131, sealing the opening of the mounting base 131. As the valve body 132 continues to rotate into the mounting base 131, the elastic member 1323 is compressed, maintaining contact between the valve core 1322 and the opening of the mounting base 131 with a greater abutment force. The second inner cavity 1321 and the first inner cavity 1311 both extend along the threaded connection direction of the valve body 132 and the mounting base 131, that is, when the valve body 132 is displaced, the valve inner core 1322 also shifts along the same direction, so that the valve inner core 1322 is more stable and the abutment with the mounting base 131 is also more stable.

[0048] Further, such as Figure 3 As shown, the mounting base 131 is provided with silicone threads 1314, which thread the mounting base 131 to the valve body 132. Due to the excellent elasticity of silicone, the mounting base 131 and the valve body 132 can be threaded together via the silicone threads 1314 to achieve a good sealing effect. This also ensures that the silicone threads 1314 maintain a good seal between the valve body 132 and the mounting base 131 during rotation and adjustment of the valve body 132. This prevents medical personnel from leaking medication through the threads during rotation and adjustment of the valve body 132 or during injection.

[0049] Further, such as Figure 1 and Figure 2 As shown, the length of the main piston cylinder 111 is greater than that of the auxiliary piston cylinder 112. It is understood that the main piston cylinder 111 is primarily used for drug delivery, while the auxiliary piston cylinder 112 is used to detect whether the drug solution has backflowed due to excessive injection pressure. Therefore, in this embodiment, the length of the main piston cylinder 111 is configured to be greater than that of the auxiliary piston cylinder 112, and the internal volume of the main piston cylinder 111 is also greater than that of the auxiliary piston cylinder 112.

[0050] Further, such as Figure 1 and Figure 2As shown, the primary piston cylinder 111 and the secondary piston cylinder 112 are arranged side by side, and the primary piston cylinder 111 and the secondary piston cylinder 112 extend in the same direction. Preferably, the injection needle 121, the primary piston cylinder 111, and the secondary piston cylinder 112 all extend in the same direction. This allows the plunger 113 to receive a more stable and concentrated force during the drug delivery process. In some embodiments, the injection needle 121 and the primary piston cylinder 111 extend along the same central axis.

[0051] Further, such as Figure 1 and Figure 2 As shown, a finger handle 114 is provided at the opening of the main piston cylinder 111. It is understandable that the finger handle 114 is used to clamp and abut two fingers of the medical staff during the process of pushing the medicine, making it convenient for the medical staff to push the medicine and inject it with their thumb.

[0052] In summary, the present application provides a dual-chamber knee joint injection device and injection method. Before using this solution, the medical staff first adjusts the conduction pressure of the one-way valve 13 according to the injection resistance of the target injection tissue, so that the conduction pressure of the one-way valve 13 plus the injection resistance of the target injection tissue is less than the buffer retraction resistance of the secondary piston cylinder 112, and then it can be determined that the injection needle 121 is inserted into the correct tissue for injection. When the injection needle 121 is inserted into the patient's non-target injection tissue, such as muscle, due to the large injection resistance of the muscle tissue, the one-way valve 13 cannot be conducted during the injection process, resulting in the injection liquid flowing into the secondary piston cylinder 112 and the plunger 113 retracting. This makes it convenient for medical staff to judge whether the injection needle 121 is inserted into the target position. It prevents the injection liquid from being mistakenly injected into other tissues and wasting the injection liquid.

[0053] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A dual-chamber knee joint injection device, characterized in that: include: A syringe body, wherein the syringe body is provided with a main piston cylinder and at least one auxiliary piston cylinder, the inner cavities of the main piston cylinder and the auxiliary piston cylinder are connected to each other, and the main piston cylinder and the auxiliary piston cylinder are movably connected to a plunger; Among them, the syringe body is also provided with a needle end, and the needle end is provided with an injection needle. The main piston cylinder is unidirectionally connected to the injection needle through a one-way valve. The one-way valve is unidirectionally connected in the direction of the injection needle, and the conduction pressure of the one-way valve is adjustable.

2. A dual-chamber knee joint injection device according to claim 1, characterized in that: The injection needle is detachably connected to the needle end, and the one-way valve comprises: A mounting base, the mounting base being arranged on the needle end, and the mounting base being provided with a first inner cavity penetrating the main piston cylinder; and a valve body, the valve body being screwed onto the mounting base, the injection needle being disposed on the valve body, the valve body defining a second inner cavity communicating with the injection needle, the second inner cavity being communicated with the first inner cavity, a valve inner core being movably connected in the second inner cavity toward the first inner cavity, the valve inner core being provided with an elastic member, the valve inner core being in contact with an opening of the first inner cavity via the elastic member; Wherein, the valve body is screwed into the mounting base, and the elastic member is compressed to increase the abutting force between the port of the mounting base and the valve inner core.

3. A dual-chamber knee joint injection device according to claim 2, characterized in that: A rotation mark is provided on at least one of the valve body and the mounting base, and the rotation mark is used to indicate the rotation angle of the valve body.

4. A dual-chamber knee joint injection device according to claim 2, characterized in that: A visual window is provided on the valve body, and the visual window is used to display the second inner cavity.

5. A dual-chamber knee joint injection device according to claim 2, characterized in that: The first inner cavity is provided with a limiting step near the opening of the valve inner core, the limiting step matches the valve inner core, and the limiting step is used to accommodate the valve inner core.

6. A dual-chamber knee joint injection device according to claim 2, characterized in that: The second inner cavity and the first inner cavity both extend along a threaded connection direction between the valve body and the mounting base.

7. A dual-chamber knee joint injection device according to claim 2, characterized in that: The mounting base is provided with a silicone thread, and the mounting base is threadedly connected to the valve body through the silicone thread.

8. A dual-chamber knee joint injection device according to claim 1, characterized in that: The length of the primary piston cylinder is greater than the length of the secondary piston cylinder.

9. The dual-chamber knee joint injection device according to claim 1, characterized in that: The main piston cylinder and the auxiliary piston cylinder are arranged side by side, and both the main piston cylinder and the auxiliary piston cylinder extend in the same direction.

10. A dual-chamber knee joint injection device according to claim 1, characterized in that: A finger handle is provided at the opening of the main piston cylinder.

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