CN211583456U - Device for directionally and continuously injecting bone cement - Google Patents

Abstract

The utility model relates to a device for directional and continuous injection of bone cement. A casing body is a hollow structure, an upper end is provided with a casing handle, and the casing handle is provided with a casing through hole which is communicated with the inside of the casing body. The cannula body is inserted into the injured vertebra during the operation; the channel body is a hollow structure with a closed lower end, a channel handle is arranged on the upper end, and a channel through hole communicated with the interior of the channel body is opened on the channel handle, and the channel body is close to the side of the lower end. The wall is provided with an injection port, and the channel handle is provided with a direction mark A corresponding to the injection port; the main body of the inner core is a hollow structure, the upper end is provided with a knob, the lower end side wall is provided with an opening, and the knob is provided with a corresponding opening. direction mark B; the injection tube is a hollow structure, the injection port at the lower end of the injection tube is communicated with the interior of the inner core body through a connecting tube, and the injection rod is inserted into the injection tube. The utility model can realize continuous injection of bone cement to the side and rear, and adjust the direction of the injection port according to the direction mark.

Description

A device for directional continuous injection of bone cement

technical field

The utility model belongs to the field of medical devices, in particular to a device for directional and continuous injection of bone cement.

Background technique

Vertebral compression fracture is the most common complication in patients with osteoporosis, and percutaneous vertebroplasty (PVP) and percutaneous kyphoplasty (PKP) are currently the most common complication in the treatment of osteoporotic vertebral compression fractures. Commonly used minimally invasive procedures. Direct injection into the injured vertebral body through the percutaneous working channel or pre-expansion with a balloon and then injection of the reconciled bone cement to strengthen the vertebral body, relieve pain, restore the height of the vertebral body or prevent injury to the vertebral body Progressive compression degeneration, correction of kyphosis and other treatment purposes.

At present, most of the bone cement injection devices directly inject the prefilled bone cement in the working channel into the injured vertebral body through the push rod. When assembling the kit, there is a problem that the push rod and the working channel are too long after the combination, which affects the intraoperative C-arm X-ray machine. Due to factors such as the gravity of the push rod and the reconciled viscosity of the bone cement, when the combination kit is placed, there will be a small amount of uncontrolled extrusion of the bone cement from the injection port of the working channel, so that the bone cement is not completely dispersed to the ideal level. Location. Due to the limitation of the inner volume of the working channel, it is necessary to prepare multiple working channels for pre-filled bone cement during the operation, which not only causes material waste, but also wastes precious time for optimal injection of bone cement due to multiple replacement of the combined working channel, which affects the operation. Effect. At the same time, when the bone cement in the working channel does not need to be completely pushed in, there are problems such as it is difficult to separate the bone cement in the tube from the bone cement in the operation area after the bone cement solidifies, and the set is difficult to pull out. In the working channel of bone cement, there will be unsolidified bone cement remaining in the pedicle channel and subcutaneous, causing unnecessary tissue damage.

At present, most of the bone cement working channels open forward, often due to the serious destruction of the vertebral body bone, the excessive increase of the local pressure when the bone cement is injected too fast, and the uncontrolled diffusion direction of the bone cement, which leads to the leakage of the bone cement. and other serious consequences.

Utility model content

In order to solve the above problems, the purpose of the present invention is to provide a device for directional continuous injection of bone cement. The device can realize intraoperative directional continuous bone cement push operation, and has the function of preventing leakage.

The purpose of this utility model is to achieve through the following technical solutions:

The utility model comprises a working sleeve, a working channel, an inner core of the channel, a bolus injector and a connecting pipe, wherein the working sleeve comprises a sleeve handle and a sleeve body, the sleeve body is a hollow structure, and the upper end is provided with a sleeve handle, The cannula handle is provided with a cannula through hole that communicates with the inside of the cannula body, and the cannula body is inserted into the injured vertebra during the operation; the working channel includes a channel handle and a channel body, and the channel body is closed at the lower end. The hollow structure has a channel handle on the upper end, a channel through hole communicating with the inside of the channel body is opened on the channel handle, an injection port is opened on the side wall of the channel body close to the lower end, and the channel handle is provided with an injection port. A direction sign A corresponding to the injection port is provided; the inner core of the channel includes a knob and an inner core main body, the inner core main body is a hollow structure, the upper end is provided with a knob, and the lower end side wall is provided with an opening, and the knob is provided with an opening. There is a direction mark B corresponding to the opening; the injector includes a push rod and an injection tube, the injection tube is a hollow structure and is used for filling bone cement, and the injection port at the lower end of the injection tube is connected with the connecting tube through the connecting tube. The inner core body is communicated internally, and the injection rod is inserted into the injection tube.

Wherein: the length of the channel body and the inner core body are equal and greater than the length of the sleeve body, and the injection port and the opening are exposed from the lower end of the sleeve body when injecting bone cement during the operation.

The injection port is opened obliquely inward along the length direction.

The channel handle is provided with a protrusion, the knob is provided with a blocking block, and a groove is formed on the lower surface of the blocking block. When the injection port is rotated to coincide with the opening, the protrusion is inserted into the groove .

There are two protrusions, which are evenly distributed along the circumferential direction; there are two blocking blocks, which are evenly distributed along the circumferential direction; when the injection port is rotated to coincide with the opening or differ by 180°, each protrusion Insert each into one groove.

When the injection port is rotated to coincide with the opening, the direction mark A and the direction mark B are collinear.

The knob is provided with a screw interface, the connecting pipe includes a hose and a large joint and a small joint at both ends of the hose, the large joint is threadedly connected to the screw interface, and the small joint is threadedly connected to the injection port .

The outer surface of the upper end of the channel body is provided with a scale A along the length direction for measuring the depth pushed into the sleeve body.

The outer surface of the injection tube is provided with a scale B along the length direction for displaying the amount of bone cement pushed in.

The working sleeve, the working channel and the inner core of the channel are all in a "T" shape, the horizontal and vertical sides of the "T" shape of the working sleeve and the working channel are cylindrical, and the "T" shape of the inner core of the channel The horizontal side is a knob, and the vertical side is a cylinder; the outer diameter of the inner core body is equal to the inner diameter of the channel body, and is tightly fitted when pushed in, the outer diameter of the channel body is equal to the inner diameter of the sleeve body, and Fits snugly when pushed in.

The advantages and positive effects of the present utility model are:

The working sleeve of the utility model is a guiding insertion device for the working channel. The working channel is provided with an injection port inclined inward from top to bottom, and the injection direction of the bone cement is the side and rear. The direction sign corresponding to the entrance direction; the working channel contains a hollow channel inner core, which can be freely rotated to adjust the switch state of the injection port; the utility model is also provided with a matching connecting tube and a bolus injector, which can realize directional continuous bone cement push during operation. Note operation, and has anti-leakage effect. Specifically:

1. The utility model can realize continuous injection of bone cement to the side and rear, and adjust the direction of the injection port according to the direction mark, avoiding the problem that the traditional end-side opening injection of bone cement cannot control the injection direction of the bone cement.

2. The utility model uses a bolus injector to inject bone cement, which avoids the influence of the gravity factor of the injection rod on the injection of bone cement; the injection tube has a large capacity, which can meet the continuous injection volume of a single bone cement, and avoid repeated intraoperative times. Time to replace the pre-cemented working channel.

3. The utility model can read the injection amount of bone cement in time according to the scale of the injection tube, so as to avoid the leakage of bone cement caused by too much injection and too fast.

4. The utility model innovates the switch setting of the injection port, which can close the injection port when the injection of bone cement is satisfactory, without moving the working channel, and effectively isolate the bone cement in the operation area and the bone cement in the tube.

5. The bayonet setting on both sides of the channel inner core knob of the utility model can ensure the stability of the "open"/"closed" state of the injection port and ensure reliable operation.

6. The utility model adopts the connecting pipe to connect the injector and the working set, which avoids the influence of the placement of the fluoroscopy machine during the operation due to the long working assembly.

7. The joints at both ends of the connecting pipe of the present invention are screwed and fixed to avoid the problem of the connection port falling off due to excessive pressure during the bone cement injection process.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the present utility model;

Fig. 2 is the structural representation of the utility model working sleeve;

3A is a schematic structural diagram of a working channel of the present invention;

3B is a partial enlarged view of the lower end of the working channel of the present invention;

Fig. 4 is the structural representation of the utility model channel inner core;

Fig. 5 is the structural representation of the bolus injector of the present invention;

Fig. 6 is the structural representation of the utility model connecting pipe;

Among them: 1 is the working casing, 101 is the casing handle, 102 is the casing body, 2 is the working channel, 201 is the channel handle, 202 is the scale A, 203 is the channel body, 204 is the injection port, and 205 is the direction mark A , 206 is the protrusion, 3 is the channel inner core, 301 is the knob, 302 is the block, 303 is the inner core body, 304 is the opening, 305 is the screw interface, 306 is the direction mark B, 4 is the injector, and 401 is the For the injection rod, 402 is an injection tube, 403 is an injection port, 404 is a scale B, 5 is a connecting tube, 501 is a large joint, 502 is a hose, and 503 is a small joint.

Detailed ways

The present utility model will be described in further detail below in conjunction with the accompanying drawings.

As shown in Figures 1-2, Figures 3A-3B and Figures 4-6, the present invention includes a working sleeve 1, a working channel 2, a channel inner core 3, an injector 4 and a connecting pipe 5, wherein the working sleeve includes The casing handle 101 and the casing body 102, the casing body 102 is a hollow structure, the upper end is provided with a casing handle 101, and the casing handle 101 is provided with a casing through hole communicating with the interior of the casing body 102, the casing The tube body 102 is inserted into the injured vertebra during the operation, and the cannula handle 101 is used for the guided placement of the working channel 2 during the operation. The working channel 2 includes a channel handle 201 and a channel body 203. The channel body 203 is a hollow structure with a closed lower end, and a channel handle 201 is provided at the upper end. The inner core body 303 is inserted, and the channel handle 201 is used to operate the working channel 2 during the operation, to perform placement and direction adjustment; There is a direction indicator A205 corresponding to the injection port 204 . The channel inner core 3 includes a knob 301 and an inner core main body 303. The inner core main body 303 is a hollow structure with a knob 301 at the upper end and an opening 304 on the side wall of the lower end. The knob 301 is provided with a direction corresponding to the opening 304 ID B306. The injector 4 includes an injection rod 401 and an injection tube 402. The injection tube 402 is a hollow structure and is used to inject bone cement. The lower end of the injection tube 402 is provided with an injection port 403 with an external thread. The injection port 403 is connected by The tube 5 is communicated with the inner core body 303 , and the injection rod 401 is inserted into the injection tube 402 .

The working sleeve 1 of this embodiment is in a "T" shape, the horizontal and vertical sides of the "T" shape are cylindrical, and the material can be stainless steel; the sleeve body 102 is a hollow cylindrical pipe with uniform thickness, and the sleeve handle 101 is a cylindrical tube, and the upper end of the casing body 102 is located in the middle of the casing handle 101 and communicates with the casing through hole opened in the middle of the casing handle 101 . The working sleeve 1 is used to guide the insertion of the working channel 2 .

The working channel 2 in this embodiment is in a "T" shape, the horizontal and vertical sides of the "T" shape are cylinders, and the material can be stainless steel. The channel body 203 is a hollow cylindrical tube with uniform thickness. The channel handle 201 is provided with protrusions 206. There are two protrusions 206 in this embodiment. The two protrusions 206 are evenly distributed along the circumferential direction of the outer periphery of the channel through hole, that is, the connection line between the two protrusions 206 and the channel The axial centerline of the handle 201 is parallel and perpendicularly intersects with the axial centerline of the channel body 203 and passes through the center of the channel through hole. The outer surface of the upper end of the channel body 203 is provided with a scale A202 (unit: 1 mm) along the length direction, which can measure the depth that the channel body 203 is pushed into the sleeve body 102 . The injection port 204 at the lower end of the channel body 203 is opened obliquely inward along the length direction, so that the bone cement diffuses to the rear side during the bolus injection. The channel handle 201 is a cylindrical tube, and the upper end of the channel body 203 is located in the middle of the channel handle 201 and communicates with the channel through hole opened in the middle of the channel handle 201. The channel through hole matches the inner diameter of the channel body 203 and is used for the inner core. Push-in of the main body 303 .

The channel inner core 3 in this embodiment is in a "T" shape, the horizontal side of the "T" shape is a knob 301, and the vertical side is a cylinder; the knob 301 is provided with a blocking block 302, and a groove is formed on the lower surface of the blocking block 302 , when the injection port 204 is rotated to coincide with the opening 304 , the protrusion 206 is inserted into the groove, so that the blocking block 302 and the protrusion 206 are clamped and fixed. There are two locking blocks 302 in this embodiment, which are in one-to-one correspondence with the protrusions 206 , and the projection of the direction mark B306 on the vertical plane is located in the middle of the two locking blocks 302 . The knob 301 is provided with a screw interface 305 for connecting with the connecting pipe 5 . The screw interface 305 has an opening in the center, and the hole diameter is the same as the inner diameter of the inner core body 303 . When the injection port 204 is rotated to coincide with the opening 304, it is in the “on” state; when the injection port 204 is rotated to be 180° away from the opening, it is in the “off” state; “on” and “off” states, each Each of the protrusions 206 is inserted into a groove; when in the "on" state, the direction mark A205 and the direction mark B306 are collinear; when in the "off" state, the direction mark A205 and the direction mark B306 differ by 180°.

The outer surface of the injection tube 402 of this embodiment is provided with a scale B404 (unit: 0.2ml, 10ml in total) along the length direction, which can read the amount of bone cement pushed in at all times. The bolus rod 41 is used for bolus injection of bone cement. The maximum volume in the injection tube 42 is about 10ml, which can meet the continuous injection operation of a single bone cement.

The connecting pipe 5 of this embodiment includes a hose 502 and a large joint 501 and a small joint 503 at both ends of the hose 502. The hose is made of medical heat-resistant plastic material. The large joint 501 is threadedly connected to the screw interface 305, and the small joint 503 It is screwed to the injection port 403.

The lengths of the channel body 203 and the inner core body 303 in this embodiment are equal and greater than the length of the sleeve body 102 . The injection port 204 and the opening 304 are exposed from the lower end of the sleeve body 102 when injecting bone cement during the operation. In the present embodiment, the outer diameter of the inner core body 303 is equal to the inner diameter of the channel body 203 and is in close contact when pushed in. The outer diameter of the channel body 203 is equal to the inner diameter of the sleeve body 102 and is in close contact when pushed in. combine.

The working principle of the utility model is:

When a bone cement push operation is required during the operation, the working sleeve 1 needs to be punctured and placed in advance. After the X-ray fluoroscopy shows that the position is satisfactory during the operation, the connected working component is inserted. Specifically:

After pouring the bone cement into the injection tube 402, insert the injection rod 401, connect the injector 4 and the screw interface 305 of the channel inner core 3 with the connecting tube 5, and insert the channel inner core 3 into the channel of the working channel 2 after the connection is firm. In the main body 203, rotate the knob 301 until the direction mark B306 is collinear with the direction mark A205, that is, rotate to the "open" state, the opening 304 coincides with the injection port 204, and the protrusion 206 is inserted into the groove of the clamping block 302. Check the buckle is firm ; Push the injection rod 401 to fill the core body 303 with the bone cement. After seeing that the bone cement is smoothly pushed out from the injection port 24, rotate the knob 301 until the direction mark B306 is 180° away from the direction mark A205, and the opening 304 and the injection port 204 The difference is 180°, that is, rotated to the "off" state, and after checking that the buckle is fastened, the channel body 203 is inserted into the sleeve body 102 . Observe the scale B206 on the upper end of the inner core body 303, and after repeated fluoroscopy to an appropriate position, rotate the knob 301 to the "on" state, and complete the bone cement injection operation under intraoperative fluoroscopy.

When the intraoperative fluoroscopy shows that the bone cement is evenly dispersed and the operation is satisfactory, turn the knob 301 to the "off" state to isolate the bone cement in the tube and the bone cement in the operation area. 2 and working casing 1. Surgery is complete.

The utility model can realize the directional continuous injection of bone cement, which not only saves the operation time, but also reduces the number of fluoroscopy. The bolus injection is too fast, the diffusion direction cannot be controlled, the local pressure is large, the recovery of compression fractures is not ideal, and the bone cement is easy to leak.

Claims (10)

1. A device for directional continuous injection of bone cement, characterized in that: comprising a working sleeve (1), a working channel (2), a channel inner core (3), a bolus device (4) and a connecting pipe ( 5), wherein the working sleeve comprises a sleeve handle (101) and a sleeve body (102), the sleeve body (102) is a hollow structure, and the upper end is provided with a sleeve handle (101), the sleeve handle (101) ) is provided with a cannula through hole that communicates with the inside of the cannula body (102), and the cannula body (102) is inserted into the injured vertebra during the operation; the working channel (2) includes a channel handle (201) and a channel A body (203), the channel body (203) is a hollow structure with a closed lower end, and a channel handle (201) is provided at the upper end, and a channel through hole that communicates with the interior of the channel body (203) is opened on the channel handle (201) , an injection port (204) is provided on the side wall of the channel body (203) close to the lower end, and the channel handle (201) is provided with a direction mark A (205) corresponding to the injection port (204) the channel inner core (3) comprises a knob (301) and an inner core main body (303), the inner core main body (303) is a hollow structure, the upper end is provided with a knob (301), and the lower end sidewall is provided with an opening (304) ), the knob (301) is provided with a direction mark B (306) corresponding to the opening (304); the injector (4) includes an injector rod (401) and a syringe (402), the The injection tube (402) has a hollow structure and is used for filling bone cement. The injection port (403) at the lower end of the injection tube (402) is communicated with the interior of the inner core body (303) through the connecting tube (5). The rod (401) is inserted into the injection tube (402). 2 . The device for directional continuous injection of bone cement according to claim 1 , wherein the length of the channel body ( 203 ) and the inner core body ( 303 ) are equal to and greater than that of the sleeve body ( 102 ). 3 . ), the injection port (204) and the opening (304) are exposed from the lower end of the sleeve body (102) during intraoperative injection of bone cement. 3 . The device for directional continuous injection of bone cement according to claim 1 , wherein the injection port ( 204 ) is opened obliquely inward along the length direction. 4 . 4. The device for directional continuous injection of bone cement according to claim 1, characterized in that: the channel handle (201) is provided with a protrusion (206), and the knob (301) is provided with a clamping block (302), a groove is formed on the lower surface of the block (302), and when the injection port (204) is rotated to coincide with the opening (304), the protrusion (206) is inserted into the groove. 5. The device for directional continuous injection of bone cement according to claim 4, characterized in that: there are two protrusions (206), which are evenly distributed along the circumferential direction; and two blocks (302) are provided. , uniformly distributed along the circumferential direction; when the injection port (204) is rotated to coincide with or 180° from the opening (304), each of the protrusions (206) is inserted into a groove. 6. The device for directional continuous injection of bone cement according to claim 1, characterized in that: when the injection port (204) is rotated to coincide with the opening (304), the direction mark A (205) corresponds to the direction Flag B (306) is collinear. 7. The device for directional continuous injection of bone cement according to claim 1, characterized in that: the knob (301) is provided with a screw interface (305), and the connecting pipe (5) comprises a hose (502) ) and the large joint (501) and small joint (503) at both ends of the hose (502), the large joint (501) is threadedly connected with the screw interface (305), and the small joint (503) is connected with the injection The port (403) is threaded. 8. The device for directional continuous injection of bone cement according to claim 1, characterized in that: the outer surface of the upper end of the channel body (203) is provided along the length direction for measuring the inner depth of the push-in sleeve body (102) Scale A (202). 9 . The device for directional and continuous injection of bone cement according to claim 1 , wherein the outer surface of the injection tube ( 402 ) is provided with a scale B ( 404 ) along the length direction for displaying the amount of the injected bone cement. 10 . 10. The device for directional continuous injection of bone cement according to claim 1, wherein the working sleeve (1), the working channel (2) and the channel inner core (3) are all in a "T" shape , the horizontal and vertical sides of the "T" shape of the working sleeve (1) and the working channel (2) are cylinders, and the horizontal side of the "T" shape of the channel inner core (3) is a knob (301), and the vertical side is a knob (301). The side is a cylinder; the outer diameter of the inner core body (303) is equal to the inner diameter of the channel body (203), and is closely fitted when pushed in, and the outer diameter of the channel body (203) is the same as that of the sleeve body (102). ) are of equal inner diameter and fit snugly when pushed in.

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