CN215129158U

CN215129158U - Cancellous bone extractor

Info

Publication number: CN215129158U
Application number: CN202120610405.2U
Authority: CN
Inventors: 姜跃国
Original assignee: Ningbo Fenghua District People's Hospital Medical Community
Current assignee: Ningbo Fenghua District People's Hospital Medical Community
Priority date: 2021-03-25
Filing date: 2021-03-25
Publication date: 2021-12-14
Anticipated expiration: 2031-03-25

Abstract

The utility model relates to an orthopedics medical instrument field specifically relates to a cancellous bone extractor, including the outer sleeve, the head end of outer sleeve is equipped with the knurled cap, still including getting the bone ware, it is tubular structure to get the bone ware, the one end inboard of getting the bone ware and stretching into the outer sleeve is equipped with a section bone cavity, is equipped with on the inner wall of getting the bone cavity to be used for pulling the traction portion of cancellous bone, the upper end of getting the bone ware is equipped with a spacing ring with conflicting knurled cap. The utility model establishes a working channel with the vertebral body through the outer sleeve, and then sends the bone extractor to sample the bone, in the process, a plurality of barb-shaped structures distributed in an annular shape are arranged, so that a little cancellous bone can be still pulled out for pathological examination under the condition of very low bone density; through setting up the spacing ring that can adjust the position to the maximum depth that bone taking device can stretch into the centrum from the outer sleeve is adjusted and controlled to the accuracy, other tissues in the effectual centrum of having protected.

Description

Cancellous bone extractor

Technical Field

The utility model relates to the field of orthopedic medical equipment, in particular to a cancellous bone extractor.

Background

Human bone is divided into cancellous and compact bone. Cancellous bone is made up of many pin-shaped or plate-shaped bones called trabeculae which are interwoven with each other. Cancellous bone is distributed at two ends of a long bone, a short bone, a flat bone and the interior of an irregular bone. The spongy bone is formed by arranging bone trabeculae which are mutually interwoven and is distributed in the bone. The trabeculae align in the direction of the pressure and tension experienced by the bone, and thus the bone can bear a greater weight. The bone is divided into cortical bone and cancellous bone in the gross structure, wherein the cortical bone accounts for 80% of the total bone mass; highly organized (bone units); blood supply comes from the Haversian tube system; the blood vessels within the Volkmann tube connect the bone units. The latter accounts for 20% of the total bone mass; a crossed grid structure; higher bone reversing ability.

At present, senile osteoporotic fracture is not rare clinically, most of senile vertebral osteoporotic compression fracture can be treated by vertebroplasty, and the method has the advantages of small wound, quick postoperative recovery and capability of getting out of bed at early stage. But vertebroplasty treatment expense is higher, because the medical instrument in the operation process is more complicated, and the cost is higher, has appeared a self-control vertebroplasty device afterwards, and the device is simple and convenient, easy-to-use, and the preparation is simple, introduces as follows, the required equipment of self-control vertebroplasty device is very simple, a 3.5 mm's stewart needle, a length 110 mm's drill sleeve (its internal diameter is 4mm), the telescopic head end knurling cap diameter of drill is 14mm, an internal diameter and the disposable syringe that the position was held to the drill head end is close, cut the syringe head end and flatten, can cup joint with the telescopic head end knurling cap of drill. The patient is in a prone position, a skin needle inserting point is positioned, the epidermis is cut after local anesthesia, the Steiner needle is penetrated through the skin, pedicle puncture is carried out according to a conventional vertebroplasty puncture method under the guidance of a C-arm machine until the Steiner needle enters the vertebral body, a drill sleeve is arranged along the Steiner needle, the drill sleeve is deeply penetrated into the vertebral body under the perspective, and then an injector is installed. The sleeve is left in the original position, the Steiner needle is pulled out, bone cement is added into the injector, the injector push rod is connected, the bone cement is pushed into the vertebral body, and the C-arm machine is noticed whether leakage exists or not during injection. Waiting for 5-8 minutes, and rotationally pulling out the drill sleeve after the bone cement is completely hardened to finish the injection of the bone cement on one side. In the above-described devices, the drill sleeve, the schanz pin, etc. can be reused, at the expense of only the bone cement and the disposable syringe. The cost is greatly saved compared with the conventional vertebroplasty. The scheme is widely used in remote areas and places with poor economic conditions.

In the process of the scheme, a small amount of sampling for cancellous bone can not be performed to perform pathological examination, so that case analysis can not be performed on a patient, and the published Chinese number is CN209499782U, namely 'a minimally invasive vertebroplasty sampler', which discloses a cancellous bone sampling method, wherein sampling is performed by increasing the friction force between a tube wall and cancellous bone, and the method has the following defects:

1. when the density of cancellous bone at the lesion is excessive, even if the friction force is increased, the cancellous bone may not be pulled out;

2. failure to precisely control the insertion of the inner tube into the vertebral body, such as too long a penetration, can cause damage to surrounding tissue.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, a cancellous bone extractor is provided.

In order to achieve the above purpose, the utility model adopts the technical scheme that:

a cancellous bone extractor comprises an outer sleeve, wherein a working channel which is communicated along the axial direction is arranged in the outer sleeve, a knurled cap is arranged at the head end of the outer sleeve, the cancellous bone extractor is of a tubular structure, one end of the cancellous bone extractor can penetrate through the head end of the outer sleeve and axially penetrate out of the tail end of the outer sleeve, a cut bone-taking cavity is arranged at the inner side of one end of the cancellous bone extractor, which extends into the outer sleeve, and a traction part for dragging cancellous bone is arranged on the inner wall of the bone-taking cavity;

the upper end of the bone extractor is provided with a limit ring which is used for abutting against the knurled cap.

Preferably, the traction part is a plurality of barb-shaped structures which are circumferentially and uniformly distributed on the inner wall of the end part of the bone extractor, and the tip of each barb-shaped structure extends inwards in an inclined manner towards the direction of the limiting ring.

Preferably, the inner side of one end of the bone extractor, which is far away from the traction part, is provided with a push rod capable of sliding along the axial direction of the bone extractor, and the total length of the push rod is greater than that of the bone extractor.

Preferably, the push rod comprises a thin holding rod and a soft rubber piston which are coaxial and fixedly connected, the diameter of the soft rubber piston is larger than that of the thin holding rod, a section of guide hole for the thin holding rod to slide and insert is formed in the inner side of one end, far away from the traction part, of the bone taking device, and the aperture of the guide hole is smaller than the inner diameter of the bone taking device.

Preferably, the side wall of the bone extractor is provided with two rectangular notches which are symmetrically distributed along the axial direction.

Preferably, the limiting ring is a rubber ring which is tightly sleeved on the outer wall of the bone extractor.

Preferably, the inner wall of the limiting ring is provided with internal threads, and the outer wall of one end of the bone extractor, which is far away from the traction part, is provided with external threads.

Preferably, the inner diameter of the outer sleeve is 4mm, and the total length of the outer sleeve is smaller than that of the bone extractor.

The utility model has the advantages that: the utility model establishes a working channel with the vertebral body through the outer sleeve, and then sends the bone extractor to sample the bone, in the process, a plurality of barb-shaped structures distributed in an annular shape are arranged, so that a little cancellous bone can be still pulled out for pathological examination under the condition of very low bone density; through setting up the spacing ring that can adjust the position to the maximum depth that bone taking device can stretch into the centrum from the outer sleeve is adjusted and controlled to the accuracy, other tissues in the effectual centrum of having protected.

Drawings

Fig. 1 is a schematic perspective view of the present invention;

fig. 2 is a plan sectional view of the present invention;

fig. 3 is a schematic sectional view of the traction portion of the present invention.

The reference numbers in the figures are:

1-an outer sleeve; 2-knurled cap; 3-taking out the bone; 4-taking a bone cavity; 5-a traction part; 6-a limiting ring; 7-barb-like structure; 8-a push rod; 9-thin holding rod; 10-a soft rubber piston; 11-a pilot hole; 12-rectangular notch.

Detailed Description

The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art.

Referring to fig. 1 to 3, a cancellous bone extractor comprises an outer sleeve 1, wherein a working channel which is through along the axial direction is arranged in the outer sleeve 1, when the cancellous bone extractor is used, a patient is in a prone position, a skin needle insertion point is positioned, the epidermis is cut after local anesthesia, a stewart needle is used for penetrating through the skin until the stewart needle enters a vertebral body, then the stewart needle is arranged in the outer sleeve 1 along the stewart needle, the head end of the outer sleeve 1 penetrates into the vertebral body in a perspective manner, a knurled cap 2 is arranged at the head end of the outer sleeve 1 and is used for subsequently sleeving a syringe and injecting bone cement, the cancellous bone extractor further comprises a bone extractor 3, the bone extractor 3 is in a tubular structure, one end of the bone extractor 3 can penetrate through the head end of the outer sleeve 1 and axially penetrate out from the tail end of the outer sleeve 1, a bone cutting cavity 4 is arranged on the inner side of one end of the bone extractor 3, and a traction part 5 for dragging cancellous bone is arranged on the inner wall of the bone extractor cavity 4; after the outer sleeve 1 goes deep into the vertebral body, the Stess needle is pulled out, then the bone taking device 3 is inserted into the vertebral body along the inner side of the outer sleeve 1, at the moment, a section of cylindrical cancellous bone is contained in a bone taking cavity 4 of the bone taking device 3, the far end of the cylindrical cancellous bone is connected with other bone substances in the vertebral body, then the bone taking device 3 is pulled out rapidly, and under the dragging action of the traction part 5, the far end of the cylindrical cancellous bone is pulled out, so that the cancellous bone in the vertebral body is taken out (the taken cancellous bone is used for pathological examination, the amount is not too much, and only a little can).

The upper end of the bone taking device 3 is provided with a limit ring 6 which is used for abutting against the knurled cap 2. When the bone extractor 3 extends into the vertebra through the sleeve and extracts cancellous bone, the head end of the bone extractor 3 can extend out of the working sleeve by 5mm, if the head end is too long, the bone body can be punctured, peripheral tissues can be damaged, and the distance of the bone extractor 3 extending out of the working sleeve can be changed by adjusting the position of the limiting ring 6 on the outer wall of the bone extractor 3. The calibration is carried out before the outer sleeve 1 enters the vertebral body, the position of the limiting ring 6 on the bone extractor 3 is adjusted, after the bone extractor 3 extends into the outer sleeve 1, when the limiting ring 6 butts against the knurled cap 2, the extending distance of the lower end of the bone extractor 3 is the maximum extending distance.

The traction part 5 is a plurality of barb-shaped structures 7 which are circumferentially and uniformly distributed on the inner wall of the end part of the bone extractor 3, and the tip of each barb-shaped structure 7 obliquely and inwardly extends towards the direction of the limiting ring 6. When the head end of the bone extractor 3 is inserted into a vertebral body and cuts a first section of cylindrical cancellous bone, the bone extractor 3 is quickly pulled out along the outer sleeve, and a little cancellous bone can be pulled out for pathological examination even if osteoporosis exists due to the barb-shaped structure 7 in the process.

Get bone organ 3 and keep away from the one end inboard of traction part 5 and be provided with one and can follow the push rod 8 that self axial slided, the total length of push rod 8 is greater than getting bone organ 3's total length. After removing cancellous bone through the bone extractor 3, the cancellous bone is pushed out from the bone extractor 3 through the push rod 8 for collection and pathological examination.

The push rod 8 is composed of a thin holding rod 9 and a soft rubber piston 10 which are coaxial and fixedly connected, the diameter of the soft rubber piston 10 is larger than that of the thin holding rod 9, a section of guide hole 11 for the thin holding rod 9 to slide and insert is arranged on the inner side of one end, far away from the traction part 5, of the bone taking device 3, and the aperture of the guide hole 11 is smaller than the inner diameter of the bone taking device 3. For the in-process of avoiding push rod 8 to push out cancellous bone, reverse damage gets barb column structure 7 of 3 head ends of bone wares, set up push rod 8 front end into flexible glue piston 10, it has good elasticity, in order to prevent to damage barb column structure 7 at the in-process of contact barb column structure 7, and simultaneously, carry out the axial spacing to thin holding rod 9 of push rod 8 upper end through getting guiding hole 11 of the bone wares 3 upper end, can use the flexible glue piston 10 of smaller diameter, make medical personnel hand thin holding rod 9 push out the in-process of getting cancellous bone ware 3, push rod 8 can only carry out the translation along the axial, and then realize flexible glue piston 10 and carry out contactless removal between barb column structure 7, in order to push out cylindrical cancellous bone.

Two rectangular notches 12 which are symmetrically distributed along the axial direction are arranged on the side wall of the bone taking device 3. The inside of the head end of the bone extractor 3 can be washed through the rectangular gap 12, so that cancellous bone in the bone extractor 3 can be washed down and collected in a washing way.

The limiting ring 6 is a rubber ring which is tightly sleeved on the outer wall of the bone extractor 3. The rubber ring is tightly sleeved on the outer wall of the bone extractor 3, and the rubber ring is prevented from sliding after contacting the knurled cap 2 through the friction force between the rubber ring and the outer wall of the bone extractor 3. When the position of the rubber ring needs to be adjusted, the rubber ring is dragged.

The inner wall of the limiting ring 6 is provided with internal threads, and the outer wall of one end of the bone taking device 3, which is far away from the traction part 5, is provided with external threads. Still can adjust the position of spacing ring 6 through screw-thread fit's mode, through rotatory spacing ring 6, make spacing ring 6 carry out axial displacement on getting the outer wall of bone ware 3 to adjust the axial position of spacing ring 6, because the existence of screw thread, avoided taking place axial displacement behind the spacing ring 6 conflict knurling cap 2 simultaneously.

The inner diameter of the outer sleeve 1 is 4mm, the specification is the specification of a drill sleeve common in an operating room, the total length of the outer sleeve 1 is smaller than that of the bone extractor 3, and the length of the bone extractor 3 needs to be larger than that of the outer sleeve 1 because the bone extractor 3 needs to penetrate through the outer sleeve 1 to enter a vertebral body and cut out cylindrical cancellous bone.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the principles of the present invention may be applied to any other embodiment without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A cancellous bone extractor comprises an outer sleeve (1), a working channel which is used for being communicated along the axial direction is arranged in the outer sleeve (1), and a knurled cap (2) is arranged at the head end of the outer sleeve (1), and is characterized by further comprising a bone extractor (3), wherein the bone extractor (3) is of a tubular structure, one end of the bone extractor can penetrate through the head end of the outer sleeve (1) and axially penetrate out from the tail end of the outer sleeve (1), a cut bone cavity (4) is arranged on the inner side of one end, extending into the outer sleeve (1), of the bone extractor (3), and a traction part (5) for dragging cancellous bone is arranged on the inner wall of the bone cavity (4);

the upper end of the bone taking device (3) is provided with a limit ring (6) which is used for abutting against the knurled cap (2).

2. The cancellous bone extractor according to claim 1, wherein the traction portion (5) is a plurality of barb-like structures (7) circumferentially and uniformly distributed on the inner wall of the end portion of the cancellous bone extractor (3), and the tip of each barb-like structure (7) extends obliquely inward toward the retaining ring (6).

3. The cancellous bone extractor according to claim 2, characterized in that a push rod (8) capable of sliding along the axial direction of the cancellous bone extractor (3) is arranged at the inner side of the end of the cancellous bone extractor (3) far away from the traction part (5), and the total length of the push rod (8) is larger than that of the cancellous bone extractor (3).

4. The cancellous bone extractor according to claim 3, characterized in that the push rod (8) is composed of a thin holding rod (9) and a soft rubber piston (10) which are coaxially and fixedly connected, the diameter of the soft rubber piston (10) is larger than that of the thin holding rod (9), a guide hole (11) for the thin holding rod (9) to be slidably inserted is formed in the inner side of one end of the cancellous bone extractor (3) far away from the traction part (5), and the diameter of the guide hole (11) is smaller than the inner diameter of the cancellous bone extractor (3).

5. The cancellous bone extractor according to claim 1, characterized in that the sidewall of the cancellous bone extractor (3) is provided with two rectangular notches (12) which are symmetrically distributed along the axial direction.

6. The cancellous bone extractor according to claim 1, characterized in that the limiting ring (6) is a rubber ring which is tightly sleeved on the outer wall of the bone extractor (3).

7. The cancellous bone extractor according to claim 1, characterized in that the inner wall of the limit ring (6) is provided with internal threads, and the outer wall of the end of the cancellous bone extractor (3) far away from the traction part (5) is provided with external threads.

8. The cancellous bone extractor according to claim 1, wherein the inner diameter of said outer sleeve (1) is 4mm, and the total length of said outer sleeve (1) is less than the total length of the extractor (3).