Prosecution Insights
Last updated: April 19, 2026
Application No. 18/507,340

NEGATIVE PRESSURE DRAINAGE SYSTEM

Non-Final OA §102§103
Filed
Nov 13, 2023
Examiner
YANG, CHENG FONG
Art Unit
3781
Tech Center
3700 — Mechanical Engineering & Manufacturing
Assignee
Shenzhen Bao'An People'S Hospital
OA Round
1 (Non-Final)
64%
Grant Probability
Moderate
1-2
OA Rounds
3y 2m
To Grant
87%
With Interview

Examiner Intelligence

Grants 64% of resolved cases
64%
Career Allow Rate
91 granted / 142 resolved
-5.9% vs TC avg
Strong +23% interview lift
Without
With
+23.0%
Interview Lift
resolved cases with interview
Typical timeline
3y 2m
Avg Prosecution
33 currently pending
Career history
175
Total Applications
across all art units

Statute-Specific Performance

§101
1.2%
-38.8% vs TC avg
§103
48.1%
+8.1% vs TC avg
§102
23.7%
-16.3% vs TC avg
§112
20.0%
-20.0% vs TC avg
Black line = Tech Center average estimate • Based on career data from 142 resolved cases

Office Action

§102 §103
DETAILED ACTION Notice of Pre-AIA or AIA Status The present application, filed on or after March 16, 2013, is being examined under the first inventor to file provisions of the AIA . Claim Rejections - 35 USC § 102 In the event the determination of the status of the application as subject to AIA 35 U.S.C. 102 and 103 (or as subject to pre-AIA 35 U.S.C. 102 and 103) is incorrect, any correction of the statutory basis (i.e., changing from AIA to pre-AIA ) for the rejection will not be considered a new ground of rejection if the prior art relied upon, and the rationale supporting the rejection, would be the same under either status. The following is a quotation of the appropriate paragraphs of 35 U.S.C. 102 that form the basis for the rejections under this section made in this Office action: A person shall be entitled to a patent unless – (a)(1) the claimed invention was patented, described in a printed publication, or in public use, on sale, or otherwise available to the public before the effective filing date of the claimed invention. Claim(s) 1-6 and 10 is/are rejected under 35 U.S.C. 102(a)(1) as being anticipated by Karpowicz et al. (US 20100022990 A1). Regarding Claim 1, Karpowicz discloses a negative pressure drainage system ("wound therapy system" [0008]; FIG. 4), comprising: a dressing ("dressing" [0008]) for being applied to a wound surface of a patient ("applied to a wound of a patient" [0008]); a collecting device ("wound sensor array 3" [0038]), buried in the dressing ("placed into the wound space" [0038]) for collecting a pressure at the dressing in real time to obtain pressure data ("real time monitoring" [0017]); and a receiving device ("wound therapy controller 5" [0038]), wirelessly connected with the collecting device, wherein the collecting device wirelessly is configured for transmitting the pressure data to the receiving device ("wound sensor array 3 is a disc shaped device that has internal power source, select sensor technologies and is wired or has a wireless transmitter for communication capability for conveying key information back to the wound therapy controller 5" [0038]). Regarding Claim 2, Karpowicz discloses the collecting device comprises a first wireless module ("sensor wireless transmitter 415" [0049]; FIG. 4), the receiving device comprises a second wireless module ("therapy unit local antenna 424" [0049]), the first wireless module is wirelessly connected with the second wireless module for realizing wireless communication between the collecting device and the receiving device ("sensor array 3 communicates with the wound therapy controller 5 either via sensor wireless transmitter 415 facilitating sensor array wireless communications 434" [0049]). Regarding Claim 3, Karpowicz discloses the negative pressure drainage system further comprises a terminal ("server 427" [0054]; FIG. 4), the receiving device is wirelessly connected with the terminal ("wound therapy controller 5 communicates with a server 427 via therapy unit wireless communications 437" [0054]), the receiving device wirelessly transmits the pressure data to the terminal, and the terminal is configured for processing the pressure data ([0024-0025]). Regarding Claim 4, Karpowicz discloses the negative pressure drainage system further comprises a negative pressure device (comprising at least of "pump 35 and motor 36" [0047], "suction delivery tube 432" [0051], and "packing 2" [0037]; FIGs. 3-4), the negative pressure device is at least partially buried in the dressing ("Suction created from this pump is applied to the patient wound bed W via suction delivery tube 432 which penetrates the wound cover 4 through tube attachment device 431" [0051]; FIG. 4), the negative pressure device is configured for providing a negative pressure at the dressing ("Pump 35 is preferably a positive displacement type of pump employing a diaphragm and inlet and outlet valves to reliably supply negative pressure to the collection circuit" [0047]), the negative pressure device is electrically connected with the terminal ([0047-0049]; FIG. 3), and the terminal is configured for adjusting a pressure provided by the negative pressure device according to the pressure data ([0014-0015] & [0024-0025]). Regarding Claim 5, Karpowicz discloses the negative pressure device comprises a conduction pipe ("suction delivery tube 432" [0051]; FIG. 4), the conduction pipe extends into the dressing ("penetrates the wound cover 4" [0051]), the conduction pipe is configured for conveying waste liquid at the dressing ("exudate removed from patient wound bed W through suction delivery tube 432" [0051]), and the collecting device is configured for collecting a pressure of the conduction pipe in the dressing ([0049]; FIG. 4). Regarding Claim 6, Karpowicz discloses the terminal is configured for adjusting the negative pressure device to enable the pressure data to be within a preset pressure range ("controller may include a receiver to receive downloaded information from the central server, wherein the information is information such as updated operating software, clinical operating protocols, and user defined settings" [0014]; "downloading information from a central server to the controller, such as updated operating software, clinical operating protocols, and user defined settings" [0024]; "control algorithm maintains this pressure within prescribed limits" [0044]). Regarding Claim 10, Karpowicz discloses receiving device further comprises a storage ("memory card" [0047]; FIG. 3), the storage is configured for storing the pressure data ("data record can be downloaded to an external memory drive" [0076]), the storage is electrically connected with the terminal ([0056]; FIG. 3), and the terminal is configured for reading the pressure data of the storage ([0047]; FIG. 3). Claim Rejections - 35 USC § 103 The following is a quotation of 35 U.S.C. 103 which forms the basis for all obviousness rejections set forth in this Office action: A patent for a claimed invention may not be obtained, notwithstanding that the claimed invention is not identically disclosed as set forth in section 102, if the differences between the claimed invention and the prior art are such that the claimed invention as a whole would have been obvious before the effective filing date of the claimed invention to a person having ordinary skill in the art to which the claimed invention pertains. Patentability shall not be negated by the manner in which the invention was made. The factual inquiries for establishing a background for determining obviousness under 35 U.S.C. 103 are summarized as follows: 1. Determining the scope and contents of the prior art. 2. Ascertaining the differences between the prior art and the claims at issue. 3. Resolving the level of ordinary skill in the pertinent art. 4. Considering objective evidence present in the application indicating obviousness or nonobviousness. This application currently names joint inventors. In considering patentability of the claims the examiner presumes that the subject matter of the various claims was commonly owned as of the effective filing date of the claimed invention(s) absent any evidence to the contrary. Applicant is advised of the obligation under 37 CFR 1.56 to point out the inventor and effective filing dates of each claim that was not commonly owned as of the effective filing date of the later invention in order for the examiner to consider the applicability of 35 U.S.C. 102(b)(2)(C) for any potential 35 U.S.C. 102(a)(2) prior art against the later invention. Claim(s) 7-9 is/are rejected under 35 U.S.C. 103 as being unpatentable over Karpowicz in view of Pratt et al. (US 20220001100 A1). Regarding Claims 7-8, Karpowicz fails to specify the negative pressure drainage system further comprises an alarm apparatus, the alarm apparatus is electrically connected with the terminal, and the terminal controls the alarm apparatus to give an alarm when a time duration for which the pressure data deviates from the preset pressure range exceeds a preset alarm time; the receiving device further comprises a display, and the display is configured for displaying the pressure data in real time. However, Pratt teaches a negative pressure wound therapy system ([0005]) wherein the negative pressure drainage system further comprises an alarm apparatus ("alert generator 156" [0059]; FIG. 4), the alarm apparatus is electrically connected with the terminal ([0058-0059]), and the terminal controls the alarm apparatus to give an alarm when a time duration for which the pressure data deviates from the preset pressure range exceeds a preset alarm time ("generate an alert in response to detecting that a difference between the second pressure decay curve and the baseline pressure decay curve exceeds a predetermined first variance threshold" [0005]); wherein the receiving device further comprises a display, and the display is configured for displaying the pressure data in real time ("User interface 148 may also include one or more display devices (e.g., LEDs. LCD displays, etc.), speakers, tactile feedback devices, or other output devices configured to provide information to a user. In some embodiments, the pressure measurements recorded by pressure sensor 130 are presented to a user via user interface 148" [0059]; FIG. 4). Therefore, it would have been obvious to one of ordinary skill in the art prior to the effective filing date of the claimed invention to modify the device of Karpowicz to incorporate the teachings of Pratt to suitably “apply and maintain the wound site at a predetermined negative pressure” ([0003]), “provide the therapy system blockage detection functionality” ([0004]), and “alert a user to such anomalous operation of the wound therapy system and/or identify and alert a user to an underlying cause (e.g, blockage and/or leak, etc.) that is responsible for the anomalous readings” (Abstract). Regarding Claim 9, Karpowicz discloses the negative pressure drainage system comprises a plurality of collecting devices and a plurality of receiving devices, the collecting devices correspond to the receiving devices one by one, the terminal is electrically connected with the plurality of receiving devices ([0024]-[0025]; NOTE: it is implied by the term "central server" that a plurality of collecting devices & receiving devices may be electrically connected with the terminal), and the display is further configured for displaying attribute information of each of the receiving devices ("displayed as a colored indicator to the patient" [0079]). Conclusion The prior art made of record and not relied upon is considered pertinent to applicant’s disclosure. The references provided on the attached PTO-892 form are considered relevant to applicant’s disclosure and are cited to further show the general state of the art. Any inquiry concerning this communication or earlier communications from the examiner should be directed to Cheng Fong "Ted" Yang whose telephone number is (571)272-8846. The examiner can normally be reached 10am - 6pm (EST) M-F. Examiner interviews are available via telephone, in-person, and video conferencing using a USPTO supplied web-based collaboration tool. To schedule an interview, applicant is encouraged to use the USPTO Automated Interview Request (AIR) at http://www.uspto.gov/interviewpractice. If attempts to reach the examiner by telephone are unsuccessful, the examiner’s supervisor, Rebecca E. Eisenberg can be reached at (571) 270-5879. The fax phone number for the organization where this application or proceeding is assigned is 571-273-8300. Information regarding the status of published or unpublished applications may be obtained from Patent Center. Unpublished application information in Patent Center is available to registered users. To file and manage patent submissions in Patent Center, visit: https://patentcenter.uspto.gov. Visit https://www.uspto.gov/patents/apply/patent-center for more information about Patent Center and https://www.uspto.gov/patents/docx for information about filing in DOCX format. For additional questions, contact the Electronic Business Center (EBC) at 866-217-9197 (toll-free). If you would like assistance from a USPTO Customer Service Representative, call 800-786-9199 (IN USA OR CANADA) or 571-272-1000. /Adam Marcetich/Primary Examiner, Art Unit 3781 Cheng Fong "Ted" Yang Examiner Art Unit 3781
Read full office action

Prosecution Timeline

Nov 13, 2023
Application Filed
Jan 09, 2026
Non-Final Rejection — §102, §103 (current)

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Study what changed to get past this examiner. Based on 5 most recent grants.

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Prosecution Projections

1-2
Expected OA Rounds
64%
Grant Probability
87%
With Interview (+23.0%)
3y 2m
Median Time to Grant
Low
PTA Risk
Based on 142 resolved cases by this examiner. Grant probability derived from career allow rate.

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